An overview of sustainable green inhibitors for aluminum in acid media

Piyush S. Desai; Falguni P. Desai; Piyush S. Desai; Falguni P. Desai

doi:10.3934/environsci.2023003

AIMS Environmental Science

2023, Volume 10, Issue 1: 33-62. doi: 10.3934/environsci.2023003

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Mini review

An overview of sustainable green inhibitors for aluminum in acid media

Piyush S. Desai ^{1
,
,},
Falguni P. Desai ²

1.
Department of Chemistry, Arts Science and Commerce College, Kholwad Kamrej Char Rasta 394185, affiliated with Veer Narmad South Gujarat University, Surat, India
2.
Principal, Shri M R Desai Arts and EELK Commerce College, Chikhli 396521, Navsari, affiliated with Veer Narmad South Gujarat University, Surat, India

Received: 24 July 2022 Revised: 25 September 2022 Accepted: 24 October 2022 Published: 18 November 2022

Metal corrosion is a significant and growing area of study in industrial problems, which has found productive research ground in the field of green chemistry. In the last 10 years, green chemistry has been highlighting the importance of safeguarding human as well as the environmental well-being, in an economically advantageous way aiming at keeping away from reducing waste hazardous toxins, and pollutants. The era of metal degradation, commonly faced due to the usage of hazardous chemicals became very relevant and useful in the research area of chemistry. Even though several experiments have been conducted and, several research articles were published on this topic of nature-friendly green and clean inhibitors still there are yet a lot of things to be explored in this field for sustainable eco-friendly existence of human and natural interconnected existence. The main aim of the study is to provide a summary and describe the past authentic research that accounted in the research literature to employ eco-friendly corrosion inhibitors, especially extraction from leaves, stems, seeds, and fruits of the plants for aluminum alloy in acid solutions in the past decade. Weight loss and electrochemical approaches are among the most often utilized methods to measure corrosion rate and to evaluate the effectiveness of green corrosion inhibitors. The relevance of the area prompted the further study, leading to a large number of substances being evaluated.

Keywords:

Citation: Piyush S. Desai, Falguni P. Desai. An overview of sustainable green inhibitors for aluminum in acid media[J]. AIMS Environmental Science, 2023, 10(1): 33-62. doi: 10.3934/environsci.2023003

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Abstract

1. Introduction

Let $\sum\limits$ denote the class of meromorphic function of the form:

$\begin{equation} \lambda \left( \omega \right) = \frac{1}{\omega }+\underset{t = 0}{\overset{ \infty }{\sum\limits }}a_{t}\omega ^{t}, \end{equation}$

(1.1)

which are analytic in the punctured open unit disc $U^{\ast } = \{\omega :\omega \in \mathbb{C}$ and $0 < \left\vert \omega \right\vert < 1\} = U-\{0\},$ where $U = U^{\ast }\cup \{0\}.$ Let $\delta \left(\omega \right) \in \sum\limits$ , be given by

$\begin{equation} \delta \left( \omega \right) = \frac{1}{\omega }+\underset{t = 0}{\overset{ \infty }{\sum\limits }}b_{t}\omega ^{t}, \end{equation}$

(1.2)

then the Convolution (Hadamard product) of $\lambda \left(\omega \right)$ and $\delta \left(\omega \right)$ is denoted and defined as:

$\begin{equation*} \left( \lambda \ast \delta \right) \left( \omega \right) = \frac{1}{\omega }+ \underset{t = 0}{\overset{\infty }{\sum\limits }}a_{t}b_{t}\omega ^{t}. \end{equation*}$

In 1967, MacGregor ^[17] introduced the concept of majorization as follows.

Definition 1. Let $\lambda$ and $\delta$ be analytic in $U^{\ast }$ . We say that $\lambda$ is majorized by $\delta$ in $U^{\ast }$ and written as $\lambda \left(\omega \right) \ll \delta \left(\omega \right) \; \omega \in U^{\ast },$ if there exists a function $\varphi \left(\omega \right),$ analytic in $U^{\ast },$ satisfying

$\begin{equation} \left \vert \varphi \left( \omega \right) \right \vert \leq 1,{ \ \ and \ \ }\lambda \left( \omega \right) = \varphi \left( \omega \right) \delta \left( \omega \right) ,{\rm{ \ }}\omega \in U^{\ast }\text{.} \end{equation}$

(1.3)

In 1970, Robertson ^[19] gave the idea of quasi-subordination as:

Definition 2. A function $\lambda \left(\omega \right)$ is subordinate to $\delta \left(\omega \right)$ in $U$ and written as: $\lambda \left(\omega \right) \prec \delta \left(\omega \right),$ if there exists a Schwarz function $k(\omega)$ , which is holomorphic in $U^{\ast }$ with $\left\vert k(\omega)\right\vert < 1$ , such that $\lambda \left(\omega \right) = \delta (k\left(\omega \right)).\$ Furthermore, if the function $\delta \left(\omega \right)$ is univalent in $U^{\ast },$ then we have the following equivalence $($ see ^[16] $)$ :

$\begin{equation} \lambda \left( \omega \right) \prec \delta \left( \omega \right)\;\;\; { and }\;\;\; \lambda \left( U\right) \subset \delta \left( U\right) \text{.} \end{equation}$

(1.4)

Further, $\lambda \left(\omega \right)$ is quasi-subordinate to $\delta \left(\omega \right)$ in $U^{\ast }$ and written is

$\begin{equation*} \lambda \left( \omega \right) \prec _{q}\delta \left( \omega \right) {\rm{ \ \ }}\left( {{\rm{\ }}}\omega \in U^{\ast }\right) \text{,} \end{equation*}$

if there exist two analytic functions $\varphi \left(\omega \right)$ and $k\left(\omega \right)$ in $U^{\ast }$ such that $\frac{\lambda \left(\omega \right) }{\varphi \left(\omega \right) }$ is analytic in $U^{\ast }$ and

$\begin{equation*} \left\vert \varphi \left( \omega \right) \right\vert \leq 1\;\;{ \ and \ }\;\; k\left( \omega \right) \leq \left\vert \omega \right\vert \lt 1{\rm{ \ \ }} \omega \in U^{\ast }\text{,} \end{equation*}$

satisfying

$\begin{equation} {\rm{\ \ }}\lambda \left( \omega \right) = \varphi \left( \omega \right) \delta \left( k\left( \omega \right) \right) {\rm{ \ \ }}\omega \in U^{\ast } \text{.} \end{equation}$

(1.5)

(ⅰ) For $\varphi \left(\omega \right) = 1$ in (1.5), we have

$\begin{equation*} {\rm{\ \ }}\lambda \left( \omega \right) = \delta \left( k\left( \omega \right) \right) {\rm{ \ \ }}\omega \in U^{\ast }, \end{equation*}$

and we say that the $\lambda$ function is subordinate to $\delta$ in $U^{\ast },$ denoted by $($ see ^[20] $)$

$\begin{equation*} \lambda \left( \omega \right) \prec \delta \left( \omega \right) {\rm{ \ \ }} \left( {{\rm{\ }}}\omega \in U^{\ast }\right) \text{.} \end{equation*}$

(ⅱ) If $k\left(\omega \right) = \omega$ , the quasi-subordination (1.5) becomes the majorization given in (1.3). For related work on majorization see ^[1,4,9,21].

Let us consider the second order linear homogenous differential equation (see, Baricz ^[6]):

$\begin{equation} \omega ^{2}k^{^{^{\prime \prime }}}\left( \omega \right) +\alpha \omega k^{^{^{\prime }}}\left( \omega \right) +\left[ \beta \omega ^{2}-\nu ^{2}+(1-\alpha )\right] k\left( \omega \right) = 0. \end{equation}$

(1.6)

The function $k_{\nu, \alpha, \beta }(\omega)$ , is known as generalized Bessel's function of first kind and is the solution of differential equation given in (1.6)

$\begin{equation} k_{\nu ,\alpha ,\beta }(\omega ) = \sum\limits\limits_{t = 0}^{\infty }\frac{(-\beta )^{t}}{\Gamma (t+1)\Gamma (t+\nu +1+\frac{\alpha +1}{2})}\left( \frac{\omega }{2}\right) ^{^{2t+\nu }}. \end{equation}$

(1.7)

Let us denote

$\begin{eqnarray*} \mathcal{L}_{\nu ,\alpha ,\beta }\lambda \left( \omega \right) & = &\frac{ 2^{\nu }\Gamma (\nu +\frac{\alpha +1}{2})}{\omega ^{\frac{\nu }{2}+1}}k_{\nu ,\alpha ,\beta }(\omega ^{\frac{1}{2}}),\ \ \\ & = &\frac{1}{\omega }+\sum\limits\limits_{t = 0}^{\infty }\frac{(-\beta )^{t+1}\Gamma (\nu +\frac{\alpha +1}{2})}{4^{t+1}\Gamma (t+2)\Gamma (t+\nu +1+\frac{\alpha +1}{2})}(\omega )^{t}, \end{eqnarray*}$

where $\nu, \; \alpha$ and $\beta$ are positive real numbers. The operator $\mathcal{L}_{\nu, \alpha, \beta }$ is a variation of the operator introduced by Deniz ^[7] (see also Baricz et al. ^[5]) for analytic functions. By using the convolution, we define the operator $\mathcal{L}_{\nu, \alpha, \beta }$ as follows:

$\begin{eqnarray} (\ \mathcal{L}_{\nu ,\alpha ,\beta }\lambda )(\omega ) & = &\mathcal{L}_{\nu ,\alpha ,\beta }\left( \omega \right) \ast \lambda (\omega ), \\ & = &\frac{1}{\omega }+\sum\limits\limits_{t = 0}^{\infty }\frac{(-\beta )^{t+1}\Gamma (\nu +\frac{\alpha +1}{2})}{4^{t+1}\Gamma (t+2)\Gamma (t+\nu +1+\frac{\alpha +1}{2})}a_{t}(\omega )^{t}. \end{eqnarray}$

(1.8)

The operator $\ \mathcal{L}_{\nu, \alpha, \beta }$ was introduced and studied by Mostafa et al. ^[15] (see also ^[2]). From (1.8), we have

$\begin{equation} \omega \left( \mathcal{L}_{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j+1} = \left( \nu -1+\frac{\alpha +1}{2}\right) \left( \mathcal{L} _{\nu -1,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j}-\left( \nu +\frac{\alpha +1}{2}\right) \left( \mathcal{L}_{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j}. \end{equation}$

(1.9)

By taking $\alpha = \beta = 1,$ the above operator reduces to $(\ \mathcal{L} _{\nu }\lambda)(\omega)$ studied by Aouf et al. ^[2].

Definition 3. Let $-1\leq B < A\leq 1, \; \eta \in \mathbb{C} -\{0\}, \; j\in W$ and $\nu, \; \alpha, \; \beta > 0$ . A function $\lambda \in \sum\limits$ is said to be in the class $M_{\alpha, \beta }^{\nu, j}(\eta, \varkappa; A, B)$ of meromorphic functions of complex order $\eta \neq 0$ in $U^{\ast }$ if and only if

$\begin{equation} 1-\frac{1}{\eta }\left( \frac{\omega \left( \mathcal{L} _{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j+1}}{\left( \mathcal{L} _{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j}}+\nu +j\right) -\varkappa \left \vert -\frac{1}{\eta }\left( \frac{\omega \left( \mathcal{L} _{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j+1}}{\left( \mathcal{L} _{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j}} +\nu +j\right) \right \vert \prec \frac{1+A\omega }{1+B\omega }. \end{equation}$

(1.10)

Remark 1.

$(i).$ For $A = 1, \; B = -1$ and $\varkappa = 0,$ we denote the class

$\begin{equation*} M_{\alpha ,\beta }^{\nu ,j}(\eta ,0;1,-1) = M_{\alpha ,\beta }^{\nu ,j}(\eta ). \end{equation*}$

So, $\lambda \in M_{\alpha, \beta }^{\nu, j}(\eta, \varkappa; A, B)$ if and only if

$\begin{equation*} \Re \left[ 1-\frac{1}{\eta }\left( \frac{\omega \left( \mathcal{L}_{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j+1}}{\left( \mathcal{L}_{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j}} +\nu +j\right) \right] \gt 0. \end{equation*}$

$(ii).$ For $\alpha = 1, \; \beta = 1$ , $M_{1, 1}^{\nu, j}(\eta, 0;1, -1)$ reduces to the class $M^{\nu, j}(\eta).$

$\begin{equation*} \Re \left[ 1-\frac{1}{\eta }\left( \frac{\omega \left( \mathcal{L} _{\nu }\lambda \left( \omega \right) \right) ^{j+1}}{\left( \mathcal{L} _{\nu }\lambda \left( \omega \right) \right) ^{j}}+\nu +j\right) \right] \gt 0. \end{equation*}$

Definition 4. A function $\lambda \in \sum\limits$ is said to be in the class $\ N_{\alpha, \beta }^{\nu, j}(\theta, b;A, B)$ of meromorphic spirllike functions of complex order $b\neq 0$ in $U^{\ast },$ if and only if

$\begin{equation} 1-\frac{e^{i\theta }}{b\cos \theta }\left( \frac{\omega \left( \mathcal{L} _{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j+1}}{\left( \mathcal{L} _{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j}} +j+1\right) \prec \frac{1+A\omega }{1+B\omega }, \end{equation}$

(1.11)

where,

$\begin{equation*} \left( -\frac{\pi }{2} \lt \theta \lt \frac{\pi }{2},\text{ }-1\leq \beta \lt A\leq 1,\eta \in \mathbb{C} -\{0\},\text{ }j\in W,\text{ }\nu ,\alpha ,\beta \gt 0\;{ and }\;\omega \in U^{\ast }\text{ }\right) . \end{equation*}$

$(i).$ For $A = 1$ and $B = -1,$ we set

$\begin{equation*} N_{\alpha ,\beta }^{\nu ,j}(\theta ,b;1,-1) = N_{\alpha ,\beta }^{\nu ,j}(\theta ,b), \end{equation*}$

where $N_{\alpha, \beta }^{\nu, j}(\theta, b)$ denote the class of functions $\lambda \in \sum\limits$ satisfying the following inequality:

$\begin{equation*} \Re \left[ \frac{e^{i\theta }}{b\cos \theta }\left( \frac{\omega \left( \mathcal{L}_{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j+1} }{\left( \mathcal{L}_{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j}}+j+1\right) \right] \lt 1. \end{equation*}$

$(ii).$ For $\theta = 0$ and $\alpha = \beta = 1$ we write

$\begin{equation*} N_{1,1}^{\nu ,j}(0,b;1,-1) = N^{\nu ,j}(b), \end{equation*}$

where $N^{\nu, j}(b)$ denote the class of functions $\lambda \in \sum\limits$ satisfying the following inequality:

$\begin{equation*} \Re \left[ \frac{1}{b}\left( \frac{\omega \left( \mathcal{L}_{\nu }\lambda \left( \omega \right) \right) ^{j+1}}{\left( \mathcal{L}_{\nu }\lambda \left( \omega \right) \right) ^{j}}+j+1\right) \right] \lt 1. \end{equation*}$

A majorization problem for the normalized class of starlike functions has been examined by MacGregor ^[17] and Altintas et al. ^[3,4]. Recently, Eljamal et al. ^[8], Goyal et al. ^[12,13], Goswami et al. ^[10,11], Li et al. ^[14], Tang et al. ^[21,22] and Prajapat and Aouf ^[18] generalized these results for different classes of analytic functions.

The objective of this paper is to examined the problems of majorization for the classes $M_{\alpha, \beta }^{\nu, j}(\eta, \varkappa; A, B)$ and $\ N_{\alpha, \beta }^{\nu, j}(\theta, b;A, B)$ .

2. Majorization problem for the class $M_{\alpha, \beta }^{\nu, j}(\eta, \varkappa; A, B)$

In Theorem 1, we prove majorization property for the class $M_{\alpha, \beta }^{\nu, j}(\eta, \varkappa; A, B).$

Theorem 1. Let the function $\lambda \in \sum\limits$ and suppose that $\delta \in M_{\alpha , \beta }^{\nu, j}(\eta, \varkappa; A, B).$ If $\ \left(\mathcal{L} _{\nu , \alpha, \beta }\lambda \left(\omega \right) \right) ^{j}$ is majorized by $\left(\mathcal{L} _{\nu, \alpha, \beta }\delta \left(\omega \right) \right) ^{j}$ in $U^{\ast }$ , then

$\begin{equation} \left \vert \left( \mathcal{L} _{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j+1}\right \vert \leq \left \vert \left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j+1}\right \vert , \left( \left \vert \omega \right \vert \lt r_{0}\right) , \end{equation}$

(2.1)

where $r_{0} = r_{0}(\eta, \varkappa, \nu, \alpha, \beta, A, B)$ is the smallest positive roots of the equation

$\begin{eqnarray} &&-\rho \left( \nu -1+\frac{\alpha +1}{2}\right) \left[ \frac{\left( A-B\right) \left \vert \eta \right \vert }{1-\varkappa }-\left( \frac{\alpha +1}{2}\right) \left \vert B\right \vert \right] r^{3}-\left( \nu -1+\frac{ \alpha +1}{2}\right) \left[ \rho \left( \frac{\alpha +1}{2}\right) +\rho ^{2}\left \vert B\right \vert -\left \vert B\right \vert \right] r^{2} \\ &&-\left( \nu -1+\frac{\alpha +1}{2}\right) \left[ \frac{\left( A-B\right) \left \vert \eta \right \vert }{1-\varkappa }-\left( \frac{\alpha +1}{2} \right) \left \vert B\right \vert +\rho ^{2}\left \vert B\right \vert -1 \right] r+ \\ &&\rho \left( \nu -1+\frac{\alpha +1}{2}\right) \left( \frac{\alpha +1}{2} \right) \\ & = &0. \end{eqnarray}$

(2.2)

Proof. Since $\delta \in M_{\alpha, \beta }^{\nu, j}(\eta, \varkappa; A, B),$ we have

$\begin{equation} 1-\frac{1}{\eta }\left( \frac{\omega \left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j+1}}{\left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}}+\nu +j\right) -\varkappa \left \vert -\frac{1}{\eta }\left( \frac{\omega \left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j+1} }{\left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}}+\nu +j\right) \right \vert = \frac{1+Ak\left( \omega \right) }{ 1+Bk\left( \omega \right) }, \end{equation}$

(2.3)

where $k\left(\omega \right) = c_{1}\omega +c_{2}\omega ^{2}+...,$ is analytic and bounded functions in $U^{\ast }$ with

$\begin{equation} {{\rm{\ }}}\left \vert k\left( \omega \right) \right \vert \leq \left \vert \omega \right \vert \ \ \left( \omega \in U^{\ast }\right) . \end{equation}$

(2.4)

Taking

$\begin{equation} \S \left( \omega \right) = 1-\frac{1}{\eta }\left( \frac{\omega \left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j+1} }{\left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}}+\nu +j\right) , \end{equation}$

(2.5)

In (2.3), we have

$\begin{equation*} \S \left( \omega \right) -\varkappa \left \vert \S \left( \omega \right) -1\right \vert = \frac{1+Ak\left( \omega \right) }{1+Bk\left( \omega \right) } , \end{equation*}$

which implies

$\begin{equation} \S \left( \omega \right) = \frac{1+\left( \frac{A-B\varkappa e^{-i\theta }}{ 1-\varkappa e^{-i\theta }}\right) k\left( \omega \right) }{1+Bk\left( \omega \right) }. \end{equation}$

(2.6)

Using (2.6) in (2.5), we get

$\begin{equation} \frac{\omega \left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j+1}}{\left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}} = -\frac{\nu +j+\left[ \frac{\left( A-B\right) \eta }{1-\varkappa e^{-i\theta }}+\left( \nu +j\right) B\right] k\left( \omega \right) }{1+Bk\left( \omega \right) }. \end{equation}$

(2.7)

Application of Leibnitz's Theorem on (1.9) gives

$\begin{equation} \omega \left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j+1} = \left( \nu -1+\frac{\alpha +1}{2}\right) \left( \mathcal{L} _{\nu -1,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}-\left( \nu +j+\frac{\alpha +1}{2}\right) \left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}. \end{equation}$

(2.8)

By using (2.8) in (2.7) and making simple calculations, we have

$\begin{equation} \frac{\left( \mathcal{L} _{\nu -1,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}}{\left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}} = \frac{\frac{\alpha +1}{2}-\left[ \frac{\left( A-B\right) \eta }{1-\varkappa e^{-i\theta }}-\left( \frac{\alpha +1}{2} \right) B\right] k\left( \omega \right) }{\left( 1+Bk\left( \omega \right) \right) \left( \nu -1+\frac{\alpha +1}{2}\right) }. \end{equation}$

(2.9)

Or, equivalently

$\begin{equation} \left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j} = \frac{\left( 1+Bk\left( \omega \right) \right) \left( \nu -1+ \frac{\alpha +1}{2}\right) }{\frac{\alpha +1}{2}-\left[ \frac{\left( A-B\right) \eta }{1-\varkappa e^{-i\theta }}-\left( \frac{\alpha +1}{2} \right) B\right] k\left( \omega \right) }\left( \mathcal{L} _{\nu -1,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}. \end{equation}$

(2.10)

Since $\left \vert k\left(\omega \right) \right \vert \leq \left \vert \omega \right \vert$ , (2.10) gives us

$\begin{eqnarray} \left \vert \left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}\right \vert &\leq &\frac{\left[ 1+\left \vert B\right \vert \left \vert \omega \right \vert \right] \left( \nu -1+\frac{\alpha +1}{ 2}\right) }{\frac{\alpha +1}{2}-\left \vert \frac{\left( A-B\right) \eta }{ 1-\varkappa e^{-i\theta }}-\left( \frac{\alpha +1}{2}\right) B\right \vert \left \vert \omega \right \vert }\left \vert \left( \mathcal{L} _{\nu -1,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}\right \vert \\ &\leq &\frac{\left[ 1+\left \vert B\right \vert \left \vert \omega \right \vert \right] \left( \nu -1+\frac{\alpha +1}{2}\right) }{\frac{\alpha +1}{2}- \left[ \frac{\left( A-B\right) \left \vert \eta \right \vert }{1-\varkappa } -\left( \frac{\alpha +1}{2}\right) \left \vert B\right \vert \right] \left \vert \omega \right \vert }\left \vert \left( \mathcal{L} _{\nu -1,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}\right \vert \end{eqnarray}$

(2.11)

Since $\left(\mathcal{L} _{\nu, \alpha, \beta }\lambda \left(\omega \right) \right) ^{j}$ is majorized by $\left(\mathcal{L} _{\nu, \alpha, \beta }\delta \left(\omega \right) \right) ^{j}$ in $U^{\ast }.$ So from (1.3), we have

$\begin{equation} \left( \mathcal{L} _{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j} = \varphi \left( \omega \right) \left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}. \end{equation}$

(2.12)

Differentiating (2.12) with respect to $\omega$ then multiplying with $\omega$ , we get

$\begin{equation} \left( \mathcal{L} _{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j} = \omega \varphi ^{^{\prime }}\left( \omega \right) \left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}+\omega \varphi \left( \omega \right) \left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j+1}. \end{equation}$

(2.13)

By using (2.8), (2.12) and (2.13), we have

$\begin{equation} \left( \mathcal{L} _{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j+1} = \frac{1}{\left( \nu -1+\frac{\alpha +1}{2}\right) }\omega \varphi ^{^{\prime }}\left( \omega \right) \left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}+\varphi \left( \omega \right) \left( \mathcal{L} _{\nu -1,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j+1}. \end{equation}$

(2.14)

On the other hand, noticing that the Schwarz function $\varphi$ satisfies the inequality

$\begin{equation} \left \vert \varphi ^{^{\prime }}\left( \omega \right) \right \vert \leq \frac{1-\left \vert \varphi \left( \omega \right) \right \vert ^{2}}{1-\left \vert \omega \right \vert ^{2}}{\rm{ \ \ \ }}\left( \omega \in U^{\ast }\right) . \end{equation}$

(2.15)

Using (2.8) and (2.15) in (2.14), we get

$\begin{eqnarray*} \left \vert \left( \mathcal{L} _{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j}\right \vert &\leq &\left[ \left \vert \varphi \left( \omega \right) \right \vert +\frac{\omega \left( 1-\left \vert \varphi \left( \omega \right) \right \vert ^{2}\right) \left[ 1+\left \vert B\right \vert \left \vert \omega \right \vert \right] \left( \nu -1+\frac{\alpha +1}{ 2}\right) }{\left( \nu -1+\frac{\alpha +1}{2}\right) \left( 1-\left \vert \omega \right \vert ^{2}\right) \left( \frac{\alpha +1}{2}-\left[ \frac{ \left( A-B\right) \left \vert \eta \right \vert }{1-\varkappa }-\left( \frac{ \alpha +1}{2}\right) B\right] \left \vert \omega \right \vert \right) } \right] \\ &&\times \left \vert \left( \mathcal{L} _{\nu -1,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}\right \vert , \end{eqnarray*}$

By taking

$\begin{equation*} \left \vert \omega \right \vert = r,{\rm{ \ \ }}\left \vert \varphi \left( \omega \right) \right \vert = \rho {\rm{ \ \ \ \ }}\left( 0\leq \rho \leq 1\right) , \end{equation*}$

reduces to the inequality

$\begin{equation*} \left \vert \left( \mathcal{L} _{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j}\right \vert \leq \frac{\Phi _{1}(\rho )}{\left( \nu -1+ \frac{\alpha +1}{2}\right) \left( 1-r^{2}\right) \left( \frac{\alpha +1}{2}- \left[ \frac{\left( A-B\right) \left \vert \eta \right \vert }{1-\varkappa } -\left( \frac{\alpha +1}{2}\right) B\right] r\right) }\left \vert \left( \mathcal{L} _{\nu -1,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}\right \vert , \end{equation*}$

where

$\begin{eqnarray} \Phi _{1}(\rho ) & = &\left[ \begin{array}{c} \rho \left( \nu -1+\frac{\alpha +1}{2}\right) \left( 1-r^{2}\right) \left( \frac{\alpha +1}{2}-\left[ \frac{\left( A-B\right) \left \vert \eta \right \vert }{1-\varkappa }-\left( \frac{\alpha +1}{2}\right) B\right] r\right) \\ +r\left( 1-\rho ^{2}\right) \left[ 1+\left \vert B\right \vert r\right] \left( \nu -1+\frac{\alpha +1}{2}\right) \end{array} \right] \\ & = &-r\left[ 1+\left \vert B\right \vert r\right] \left( \nu -1+\frac{\alpha +1}{2}\right) \rho ^{2}+\rho \left( \nu -1+\frac{\alpha +1}{2}\right) \left( 1-r^{2}\right) \\ &&\left( \frac{\alpha +1}{2}-\left[ \frac{\left( A-B\right) \left \vert \eta \right \vert }{1-\varkappa }-\left( \frac{\alpha +1}{2}\right) B\right] r\right) +r\left[ 1+\left \vert B\right \vert r\right] \left( \nu -1+\frac{ \alpha +1}{2}\right) ,{\rm{ \ \ \ \ \ \ \ \ \ \ }} \end{eqnarray}$

(2.16)

takes in maximum value at $\rho = 1$ with $r_{0} = r_{0}(\eta, \varkappa, \nu, \alpha, \beta, A, B)$ where $r_{0}$ is the least positive root of the (2.2). Furthermore, if $0\leq \xi _{0}\leq r_{0}(\eta, \varkappa, \nu, \alpha, \beta, A, B),$ then the function $\psi _{1}(\rho)$ defined by

$\begin{eqnarray} \psi _{1}(\rho ) & = &-\xi _{0}\left[ 1+\left \vert B\right \vert \xi _{0} \right] \left( \nu -1+\frac{\alpha +1}{2}\right) \rho ^{2}+\rho \left( \nu -1+\frac{\alpha +1}{2}\right) \left( 1-\xi _{0}^{2}\right) \\ &&\left( \frac{\alpha +1}{2}-\left[ \frac{\left( A-B\right) \left \vert \eta \right \vert }{1-\varkappa }-\left( \frac{\alpha +1}{2}\right) B\right] \xi _{0}\right) +\xi _{0}\left[ 1+\left \vert B\right \vert \xi _{0}\right] \left( \nu -1+\frac{\alpha +1}{2}\right) ,{\rm{ \ \ \ \ \ \ \ \ \ }} \end{eqnarray}$

(2.17)

is an increasing function on the interval $\left(0\leq \rho \leq 1\right),$ so that

$\begin{eqnarray*} \psi _{1}(\rho ) &\leq &\psi _{1}(1) = \left( \nu -1+\frac{\alpha +1}{2} \right) \left( 1-\xi _{0}^{2}\right) \left[ \frac{\alpha +1}{2}-\left( \frac{ \left( A-B\right) \left \vert \eta \right \vert }{1-\varkappa }-\left( \frac{ \alpha +1}{2}\right) B\right) \xi _{0}\right] \\ &&\left( 0\leq \rho \leq 1,\text{ }0\leq \xi _{0}\leq r_{0}(\eta ,\varkappa ,A,B)\right) . \end{eqnarray*}$

Hence, upon setting $\rho = 1$ in (2.17), we achieve (2.1).

Special Cases: Let $A = 1$ and $B = -1$ in Theorem 1, we obtain the following corollary.

Corollary 1. Let the function $\lambda \in \sum\limits$ and suppose that $\delta \in M_{\alpha , \beta }^{\nu, j}(\eta, \varkappa; A, B).$ If $\ \left(\mathcal{L} _{\nu , \alpha, \beta }\lambda \left(\omega \right) \right) ^{j}$ is majorized by $\left(\mathcal{L} _{\nu, \alpha, \beta }\delta \left(\omega \right) \right) ^{j}$ in $U^{\ast }$ , then

$\begin{equation*} \left \vert \left( \mathcal{L} _{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j+1}\right \vert \leq \left \vert \left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j+1}\right \vert , \left( \left \vert \omega \right \vert \lt r_{1}\right) , \end{equation*}$

where $r_{1} = r_{1}(\eta, \varkappa, \nu, \alpha, \beta)$ is the least positive roots of the equation

$\begin{eqnarray} &&\rho \left( \nu -1+\frac{\alpha +1}{2}\right) \left[ \frac{2\left \vert \eta \right \vert }{1-\varkappa }-\left( \frac{\alpha +1}{2}\right) \right] r^{3}-\left( \nu -1+\frac{\alpha +1}{2}\right) \left[ \rho \left( \frac{ \alpha +1}{2}\right) +\rho ^{2}-1\right] r^{2}- \\ &&\left( \nu -1+\frac{\alpha +1}{2}\right) \left[ \rho \left \{ \frac{2\left \vert \eta \right \vert }{1-\varkappa }-\left( \frac{\alpha +1}{2}\right) \right \} +\rho ^{2}-1\right] r+\rho \left( \nu -1+\frac{\alpha +1}{2} \right) \left( \frac{\alpha +1}{2}\right) \\ & = &0. \end{eqnarray}$

(2.18)

Here, $r = -1$ is one of the roots (2.18) and the other roots are given by

$\begin{equation*} r_{1} = \frac{k_{0}- \sqrt{k_{0}^{2}-4\rho ^{2}\left( \nu -1+\frac{\alpha +1 }{2}\right) \left[ \frac{2\left \vert \eta \right \vert }{1-\varkappa } -\left( \frac{\alpha +1}{2}\right) \right] \left( \nu -1+\frac{\alpha +1}{2} \right) \left( \frac{\alpha +1}{2}\right) }}{2\rho \left( \nu -1+\frac{ \alpha +1}{2}\right) \left[ \frac{2\left \vert \eta \right \vert }{ 1-\varkappa }-\left( \frac{\alpha +1}{2}\right) \right] }, \end{equation*}$

where

$\begin{equation*} k_{0} = \left( \nu -1+\frac{\alpha +1}{2}\right) \left[ \rho \left \{ \frac{2\left \vert \eta \right \vert }{1-\varkappa }-2\left( \frac{\alpha +1 }{2}\right) \right \} +\rho ^{2}-1\right] . \end{equation*}$

Taking $\varkappa = 0$ in corollary 1, we state the following:

Corollary 2. Let the function $\lambda \in \sum\limits$ and suppose that $\delta \in M_{\alpha , \beta }^{\nu, j}(\eta, \varkappa; A, B).$ If $\ \left(\mathcal{L} _{\nu , \alpha, \beta }\lambda \left(\omega \right) \right) ^{j}$ is majorized by $\left(\mathcal{L} _{\nu, \alpha, \beta }\delta \left(\omega \right) \right) ^{j}$ in $U^{\ast }$ , then

$\begin{equation*} \left| {{{\left( {{{\cal L}_{v,\alpha ,\beta }}\lambda (\omega )} \right)}^{j + 1}}} \right| \le \left| {{{\left( {{{\cal L}_{v,\alpha ,\beta }}\delta (\omega )} \right)}^{j + 1}}} \right| ,\;\;\;\; \left( \left \vert \omega \right \vert \lt r_{2}\right) , \end{equation*}$

where $r_{2} = r_{2}(\eta, \nu, \alpha, \beta)$ is the lowest positive roots of the equation

$\begin{eqnarray} &&\rho \left( \nu -1+\frac{\alpha +1}{2}\right) \left[ 2\left \vert \eta \right \vert -\left( \frac{\alpha +1}{2}\right) \right] r^{3}-\left( \nu -1+ \frac{\alpha +1}{2}\right) \left[ \rho \left( \frac{\alpha +1}{2}\right) +\rho ^{2}-1\right] r^{2}- \\ &&\left( \nu -1+\frac{\alpha +1}{2}\right) \left[ \rho \left \{ 2\left \vert \eta \right \vert -\left( \frac{\alpha +1}{2}\right) \right \} +\rho ^{2}-1 \right] r+\rho \left( \nu -1+\frac{\alpha +1}{2}\right) \left( \frac{\alpha +1}{2}\right) \\ & = &0, \end{eqnarray}$

(2.19)

given by

$\begin{equation*} r_{2} = \frac{k_{1}- \sqrt{k_{1}^{2}-4\rho ^{2}\left( \nu -1+\frac{\alpha +1 }{2}\right) \left[ 2\left \vert \eta \right \vert -\left( \frac{\alpha +1}{2} \right) \right] \left( \nu -1+\frac{\alpha +1}{2}\right) \left( \frac{\alpha +1}{2}\right) }}{2\rho \left( \nu -1+\frac{\alpha +1}{2}\right) \left[ 2\left \vert \eta \right \vert -\left( \frac{\alpha +1}{2}\right) \right] }, \end{equation*}$

where

$\begin{equation*} k_{1} = \left( \nu -1+\frac{\alpha +1}{2}\right) \left[ \rho \left \{ 2\left \vert \eta \right \vert -2\left( \frac{\alpha +1}{2}\right) \right \} +\rho ^{2}-1\right] . \end{equation*}$

Taking $\alpha = \beta = 1$ in corollary 2, we get the following:

Corollary 3. Let the function $\lambda \in \sum\limits$ and suppose that $\delta \in M_{\alpha , \beta }^{\nu, j}(\eta, \varkappa; A, B).$ If $\ \left(\mathcal{L} _{\nu , \alpha, \beta }\lambda \left(\omega \right) \right) ^{j}$ is majorized by $\left(\mathcal{L} _{\nu, \alpha, \beta }\delta \left(\omega \right) \right) ^{j}$ in $U^{\ast }$ , then

where $r_{3} = r_{3}(\eta, \nu)$ is the lowest positive roots of the equation

$\begin{eqnarray} &&\rho \nu \left[ 2\left \vert \eta \right \vert -1\right] r^{3}-\nu \left[ \rho +\rho ^{2}-1\right] r^{2}-\nu \left[ \rho \left( 2\left \vert \eta \right \vert -1\right) +\rho ^{2}-1\right] r+\rho \nu \\ & = &0, \end{eqnarray}$

(2.20)

given by

$\begin{equation*} r_{3} = \frac{k_{2}- \sqrt{k_{2}^{2}-4\rho ^{2}\nu \left[ 2\left \vert \eta \right \vert -1\right] \nu }}{2\rho \nu \left[ 2\left \vert \eta \right \vert -1\right] }, \end{equation*}$

where

$\begin{equation*} k_{2} = \nu \left[ \rho \left \{ 2\left \vert \eta \right \vert -2\right \} +\rho ^{2}-1\right] . \end{equation*}$

3. Majorization problem for the class $N_{\alpha, \beta }^{\nu, j}(\theta, b;A, B)$

Secondly, we exam majorization property for the class $N_{\alpha, \beta }^{\nu, j}(\theta, b;A, B).$

Theorem 2. Let the function $\lambda \in \sum\limits$ and suppose that $\delta \in N_{\alpha , \beta }^{\nu, j}(\theta, b;A, B).$ If

$\begin{equation*} \left( \mathcal{L}_{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j}\ll \left( \mathcal{L}_{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j},\left( j\in 0,1,2...\right) , \end{equation*}$

then

$\begin{equation} \left\vert \left( \mathcal{L}_{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j+1}\right\vert \leq \left\vert \left( \mathcal{L}_{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j+1}\right\vert , \left( \left\vert \omega \right\vert \lt r_{4}\right) , \end{equation}$

(3.1)

where $r_{4} = r_{4}(\theta, b, \nu, \alpha, \beta, A, B)$ is the smallest positive roots of the equation

$\begin{eqnarray} &&-\rho \left[ \left\vert \left( B-A\right) b\cos \theta +\left( \nu +\frac{ \alpha +1}{2}-1\right) \left\vert B\right\vert \right\vert \right] r^{3}- \\ &&\left[ \rho \left\{ \nu +\frac{\alpha +1}{2}-1\right\} -\left\vert B\right\vert \left( 1-\rho ^{2}\right) \left( \nu -1+\frac{\alpha +1}{2} \right) \right] r^{2} \\ &&+\left[ \rho \left\{ \left\vert \left( B-A\right) b\cos \theta +\left( \nu +\frac{\alpha +1}{2}-1\right) \left\vert B\right\vert \right\vert \right\} +\left( 1-\rho ^{2}\right) \left( \nu -1+\frac{\alpha +1}{2}\right) \right] r \\ &&+\rho \left[ \nu +\frac{\alpha +1}{2}-1\right] = 0, \\ &&\mathit{\text{}}\left( -\frac{\pi }{2} \lt \theta \lt \frac{\pi }{2},\mathit{\text{}}-1\leq \beta \lt A\leq 1,\eta \in \mathbb{C} -\{0\},\mathit{\text{}}\nu ,\alpha ,\beta \gt 0,\mathit{\text{and}}\;\omega \in U^{\ast }\mathit{\text{}} \right) . \end{eqnarray}$

(3.2)

Proof. Since $\delta \in N_{\alpha, \beta }^{\nu, j}(\theta, b;A, B)$ , so

(3.3)

where, $k\left(\omega \right)$ is defined as (2.4).

From (3.3), we have

$\begin{equation} \frac{\omega \left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j+1}}{\left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}} = \frac{\left[ \left( B-A\right) b\cos \theta -\left( j+1\right) Be^{i\theta }\right] k\left( \omega \right) -\left( j+1\right) e^{i\theta }}{e^{i\theta }\left( 1+Bk\left( \omega \right) \right) }. \end{equation}$

(3.4)

Now, using (2.8) in (3.4) and making simple calculations, we obtain

$\begin{equation} \frac{\left( \mathcal{L} _{\nu -1,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}}{\left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}} = \frac{ \begin{array}{c} \left[ \left( B-A\right) b\cos \theta +\left( \nu +\frac{\alpha +1}{2} -1 \right) Be^{i\theta }\right] k\left( \omega \right) \\ +\left[ \left( \nu +j+\frac{\alpha +1}{2}\right) -1 \right] e^{i\theta } \end{array} }{e^{i\theta }\left( 1+Bk\left( \omega \right) \right) \left( \nu -1+\frac{ \alpha +1}{2}\right) }, \end{equation}$

(3.5)

which, in view of $\ \left \vert k\left(\omega \right) \right \vert \leq \left \vert \omega \right \vert \; \ \left(\omega \in U^{\ast }\right),$ immediately yields the following inequality

$\begin{eqnarray} \left \vert \left( \mathcal{L} _{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}\right \vert &\leq &\frac{\left \vert e^{i\theta }\right \vert \left( 1+\left \vert B\right \vert \left \vert k\left( \omega \right) \right \vert \right) \left( \nu -1+\frac{\alpha +1}{2}\right) }{ \begin{array}{c} \left[ \left \vert \left( B-A\right) b\cos \theta +\left( \nu +\frac{ \alpha +1}{2}-1 \right) Be^{i\theta }\right \vert \right] \left \vert k\left( \omega \right) \right \vert \\ +\left[ \left( \nu +\frac{\alpha +1}{2}\right) -1 \right] \left \vert e^{i\theta }\right \vert \end{array} } \\ &&\times \left \vert \left( \mathcal{L} _{\nu -1,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}\right \vert . \end{eqnarray}$

(3.6)

Now, using (2.15) and (3.6) in (2.14) and working on the similar lines as in Theorem 1, we have

$\begin{eqnarray*} \left \vert \left( \mathcal{L} _{\nu -1,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j}\right \vert &\leq &\left[ \left \vert \varphi \left( \omega \right) \right \vert +\frac{\left \vert \omega \right \vert \left( 1-\left \vert \varphi \left( \omega \right) \right \vert ^{2}\right) \left( 1+\left \vert B\right \vert \left \vert \omega \right \vert \right) \left( \nu -1+\frac{\alpha +1}{2}\right) }{\left( 1-\left \vert \omega \right \vert ^{2}\right) \left[ \begin{array}{c} \left \{ \left \vert \left( B-A\right) b\cos \theta +\left( \begin{array}{c} \nu +\frac{\alpha +1}{2} -1 \end{array} \right) B\right \vert \right \} \left \vert \omega \right \vert \\ +\left[ \left( \nu +\frac{\alpha +1}{2}\right) -1 \right] \end{array} \right] }\right] \\ &&\times \left \vert \left( \mathcal{L} _{\nu -1,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}\right \vert . \end{eqnarray*}$

By setting $\left \vert \omega \right \vert = r, \;\; \left \vert \varphi \left(\omega \right) \right \vert = \rho \;\; \left(0\leq \rho \leq 1\right),$ leads us to the inequality

$\begin{eqnarray} \left \vert \left( \mathcal{L} _{\nu -1,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j}\right \vert &\leq &\left[ \frac{\Phi _{2}(\rho )}{ \left( 1-r^{2}\right) \left[ \begin{array}{c} \left \{ \left \vert \left( B-A\right) b\cos \theta +\left( \nu +\frac{ \alpha +1}{2}-1 \right) B\right \vert \right \} r \\ +\left( \nu +\frac{\alpha +1}{2}\right) -1 \end{array} \right] }\right] \\ &&\times \left \vert \left( \mathcal{L} _{\nu -1,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j}\right \vert , \end{eqnarray}$

(3.7)

where the function $\Phi _{2}(\rho)$ is given by

$\begin{eqnarray*} \Phi _{2}(\rho ) & = &\rho \left( 1-r^{2}\right) \left[ \begin{array}{c} \left \{ \left \vert \left( B-A\right) b\cos \theta +\left( \nu +\frac{ \alpha +1}{2}-1 \right) B\right \vert \right \} r \\ +\left( \nu +\frac{\alpha +1}{2}\right) -1 \end{array} \right] \\ &&+r\left( 1-\rho ^{2}\right) \left( 1+Br\right) \left( \nu -1+\frac{\alpha +1}{2}\right) . \end{eqnarray*}$

$\Phi _{2}(\rho)$ its maximum value at $\rho = 1$ with $r_{4} = r_{4}(\theta, b, \nu, \alpha, \beta, A, B)$ given in (3.2). Moreover if $0\leq \xi _{1}\leq r_{4}(\theta, b, \nu, \alpha, \beta, A, B),$ then the function.

$\begin{eqnarray*} \psi _{2}(\rho ) & = &\rho \left( 1-\xi _{1}^{2}\right) \left[ \begin{array}{c} \left \{ \left \vert \left( B-A\right) b\cos \theta +\left( \nu +\frac{ \alpha +1}{2}-1 \right) B\right \vert \right \} \xi _{1} \\ +\left( \nu +\frac{\alpha +1}{2}\right) -1 \end{array} \right] \\ &&+\xi _{1}\left( 1-\rho ^{2}\right) \left( 1+B\xi _{1}\right) \left( \nu -1+ \frac{\alpha +1}{2}\right) , \end{eqnarray*}$

increasing on the interval $0\leq \rho \leq 1,$ so that $\psi _{2}(\rho)$ does not exceed

$\begin{equation*} \psi _{2}(1) = \left( 1-\xi _{1}^{2}\right) \left[ \begin{array}{c} \left \{ \left \vert \left( B-A\right) b\cos \theta +\left( \nu +\frac{ \alpha +1}{2}-1 \right) B\right \vert \right \} \xi _{1} \\ +\left( \nu +\frac{\alpha +1}{2}\right) -1 \end{array} \right] . \end{equation*}$

Therefore, from this fact (3.7) gives the inequality (3.1). We complete the proof.

Special Cases: Let $A = 1$ and $B = -1$ in Theorem 2, we obtain the following corollary.

Corollary 4. Let the function $\lambda \in \sum\limits$ and suppose that $\delta \in N_{\alpha , \beta }^{\nu, j}(\theta, b;A, B).$ If

then

$\begin{equation*} \left\vert \left( \mathcal{L}_{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j+1}\right\vert \leq \left\vert \left( \mathcal{L}_{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j+1}\right\vert , \left( \left\vert \omega \right\vert \lt r_{5}\right) , \end{equation*}$

where $r_{5} = r_{5}(\theta, b, \nu, \alpha, \beta)$ is the lowest positive roots of the equation

$\begin{eqnarray} &&-\rho \left[ \left\vert -2b\cos \theta +\left( \nu +\frac{\alpha +1}{2} -1\right) \right\vert \right] r^{3}- \\ &&\left[ \rho \left\{ \nu +\frac{\alpha +1}{2}-1\right\} -\left( 1-\rho ^{2}\right) \left( \nu -1+\frac{\alpha +1}{2}\right) \right] r^{2}+ \\ &&\left[ \rho \left\{ \left\vert -2b\cos \theta +\left( \nu +\frac{\alpha +1 }{2}-1\right) \right\vert \right\} +\left( 1-\rho ^{2}\right) \left( \nu -1+ \frac{\alpha +1}{2}\right) \right] r+ \\ &&\rho \left[ \nu +\frac{\alpha +1}{2}-1\right] = 0. \end{eqnarray}$

(3.8)

Where $r = -1$ is first roots and the other two roots are given by

$\begin{equation*} \mathit{\text{}}r_{5} = \frac{\kappa _{0}-\sqrt{\kappa _{0}^{2}+4\rho ^{2}\left[ \left\vert -2b\cos \theta +\left( \nu +\frac{\alpha +1}{2}-1\right) \right\vert \right] \left[ \nu +\frac{\alpha +1}{2}-1\right] }}{-2\rho \left[ \left\vert -2b\cos \theta +\left( \nu +\frac{\alpha +1}{2}-1\right) \right\vert \right] }\mathit{\text{,}} \end{equation*}$

and

$\begin{equation*} \kappa _{0} = \left[ \left( 1-\rho ^{2}\right) \left( \nu -1+\frac{\alpha +1}{2 }\right) -\rho \left\{ \left\vert -2b\cos \theta +2\left( \nu +\frac{\alpha +1}{2}-1\right) \right\vert \right\} \right] .\mathit{\text{}} \end{equation*}$

Which reduces to Corollary 4 for $\theta = 0$ .

Corollary 5. Let the function $\lambda \in \sum\limits$ and suppose that $\delta \in N_{\alpha , \beta }^{\nu, j}(\theta, b;A, B).$ If

then

$\begin{equation*} \left\vert \left( \mathcal{L}_{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j+1}\right\vert \leq \left\vert \left( \mathcal{L}_{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j+1}\right\vert , \left( \left\vert \omega \right\vert \lt r_{6}\right) , \end{equation*}$

where $r_{6} = r_{6}(b, \nu, \alpha, \beta)$ is the least positive roots of the equation

$\begin{eqnarray} &&-\rho \left[ \left\vert -2b+\left( \nu +\frac{\alpha +1}{2}-1\right) \right\vert \right] r^{3}- \\ &&\left[ \rho \left\{ \nu +\frac{\alpha +1}{2}-1\right\} -\left( 1-\rho ^{2}\right) \left( \nu -1+\frac{\alpha +1}{2}\right) \right] r^{2}+ \\ &&\left[ \rho \left\{ \left\vert -2b+\left( \nu +\frac{\alpha +1}{2} -1\right) \right\vert \right\} +\left( 1-\rho ^{2}\right) \left( \nu -1+ \frac{\alpha +1}{2}\right) \right] r+ \\ &&\rho \left[ \nu +\frac{\alpha +1}{2}-1\right] = 0, \end{eqnarray}$

(3.9)

given by

$\begin{equation*} r_{6} = \frac{\kappa _{1}-\sqrt{\kappa _{1}^{2}+4\rho ^{2}\left[ \left\vert -2b+\left( \nu +\frac{\alpha +1}{2}-1\right) \right\vert \right] \left[ \nu + \frac{\alpha +1}{2}-1\right] }}{-2\rho \left[ \left\vert -2b+\left( \nu + \frac{\alpha +1}{2}-1\right) \right\vert \right] },\mathit{\text{}} \end{equation*}$

and

$\begin{equation*} \kappa _{1} = \left[ \left( 1-\rho ^{2}\right) \left( \nu -1+\frac{ \alpha +1}{2}\right) -\rho \left\{ \left\vert -2b+2\left( \nu +\frac{\alpha +1}{2}-1\right) \right\vert \right\} \right] .\mathit{\text{}} \end{equation*}$

Taking $\alpha = \beta = 1$ in corollary 5, we get.

Corollary 6. Let the function $\lambda \in \sum\limits$ and suppose that $\delta \in N_{\alpha , \beta }^{\nu, j}(\theta, b;A, B).$ If

then

$\begin{equation*} \left\vert \left( \mathcal{L}_{\nu ,\alpha ,\beta }\lambda \left( \omega \right) \right) ^{j+1}\right\vert \leq \left\vert \left( \mathcal{L}_{\nu ,\alpha ,\beta }\delta \left( \omega \right) \right) ^{j+1}\right\vert , \left( \left\vert \omega \right\vert \lt r_{7}\right) , \end{equation*}$

where $r_{7} = r_{7}(b, \nu)$ is the lowest positive roots of the equation

$\begin{eqnarray} &&-\rho \left\vert -2b+\nu \right\vert r^{3}-\left[ \rho \nu -\left( 1-\rho ^{2}\right) \nu \right] r^{2}+ \\ &&\left[ \rho \left\vert -2b+\nu \right\vert +\left( 1-\rho ^{2}\right) \nu \right] r+\rho \left[ \nu \right] = 0, \end{eqnarray}$

(3.10)

given by

$\begin{equation*} r_{7} = \frac{\kappa _{2}-\sqrt{\kappa _{2}^{2}+4\rho ^{2}\left[ \left\vert -2b+\nu \right\vert \right] \left[ \nu \right] }}{-2\rho \left[ \left\vert -2b+\nu \right\vert \right] },\mathit{\text{}} \end{equation*}$

and

$\begin{equation*} \kappa _{2} = \left[ \left( 1-\rho ^{2}\right) \nu -\rho \left\{ \left\vert -2b+2\nu \right\vert \right\} \right] . \end{equation*}$

4. Conclusion

In this paper, we explore the problems of majorization for the classes $M_{\alpha, \beta }^{\nu, j}(\eta, \varkappa; A, B)$ and $N_{\alpha, \beta }^{\nu, j}(\theta, b;A, B)$ by using a convolution operator $\mathcal{L} _{\nu, \alpha, \beta }$ . These results generalizes and unify the theory of majorization which is an active part of current ongoing research in Geometric Function Theory. By specializing different parameters like $\nu, \; \eta, \; \varkappa, \; \theta$ and $b$ , we obtain a number of important corollaries in Geometric Function Theory.

Acknowledgments

The work here is supported by GUP-2019-032.

Conflict of interest

The authors agree with the contents of the manuscript, and there is no conflict of interest among the authors.

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AIMS Environmental Science

An overview of sustainable green inhibitors for aluminum in acid media

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Abstract

1. Introduction

2. Majorization problem for the class $M_{\alpha, \beta }^{\nu, j}(\eta, \varkappa; A, B)$

3. Majorization problem for the class $N_{\alpha, \beta }^{\nu, j}(\theta, b;A, B)$

4. Conclusion

Acknowledgments

Conflict of interest

References

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Abstract

1. Introduction

2. Majorization problem for the class $M_{\alpha, \beta }^{\nu, j}(\eta, \varkappa; A, B)$

3. Majorization problem for the class $N_{\alpha, \beta }^{\nu, j}(\theta, b;A, B)$

4. Conclusion

Acknowledgments

Conflict of interest

References

AIMS Environmental Science

An overview of sustainable green inhibitors for aluminum in acid media

Related Papers:

Abstract

1. Introduction

2. Majorization problem for the class Mν,jα,β(η,ϰ;A,B) M_{\alpha, \beta }^{\nu, j}(\eta, \varkappa; A, B)

3. Majorization problem for the class Nν,jα,β(θ,b;A,B) N_{\alpha, \beta }^{\nu, j}(\theta, b;A, B)

4. Conclusion

Acknowledgments

Conflict of interest

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Abstract

1. Introduction

2. Majorization problem for the class Mν,jα,β(η,ϰ;A,B) M_{\alpha, \beta }^{\nu, j}(\eta, \varkappa; A, B)

3. Majorization problem for the class Nν,jα,β(θ,b;A,B) N_{\alpha, \beta }^{\nu, j}(\theta, b;A, B)

4. Conclusion

Acknowledgments

Conflict of interest

References

2. Majorization problem for the class $M_{\alpha, \beta }^{\nu, j}(\eta, \varkappa; A, B)$

3. Majorization problem for the class $N_{\alpha, \beta }^{\nu, j}(\theta, b;A, B)$

2. Majorization problem for the class $M_{\alpha, \beta }^{\nu, j}(\eta, \varkappa; A, B)$

3. Majorization problem for the class $N_{\alpha, \beta }^{\nu, j}(\theta, b;A, B)$