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SYNTHESIS OF PHOTOLUMINESCENT CORE-SHELL SILICA PARTICLES BY SACRIFICIAL POLYMER SHELL METHOD
MEHDI GHAHARI,PAOLA FABBRI,TOURADJ EBADZADEH,ROYA AGHABABAZADEH,FRANCESCO PILATI,FREYDOON ALIKHANI HESARI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2010 NANO Vol.5 No.4
A novel approach has been developed for the synthesis of SiO2@Y2O3:Eu3+ particles with core-shell structure. In this method the polymer shell is obtained by copolymerization of methacryl oxyethyl isocyanate onto silica particles which are chemically modified by 3-(trimethoxysilyl) propyl methacrylate. The grafted polymer acts as template to prepare the luminescent shell on silica particles. Then, the obtained silica-polymer core-shell particles are dispersed in a solution of Yttrium and Europium nitrates to allow a physical adsorption of the ions by the polymer shell. The sacrificial polymer shell will be removed by thermal treatment to obtain photoluminescent SiO2@Y2O3:Eu3+ core-shell particles. Results reveal that the intensity of photoluminescence of these core-shell particles is much higher than intensity of particles prepared without sacrificial polymer shell.
TOTAL IDENTITY-SUMMAND GRAPH OF A COMMUTATIVE SEMIRING WITH RESPECT TO A CO-IDEAL
Atani, Shahabaddin Ebrahimi,Hesari, Saboura Dolati Pish,Khoramdel, Mehdi Korean Mathematical Society 2015 대한수학회지 Vol.52 No.1
Let R be a semiring, I a strong co-ideal of R and S(I) the set of all elements of R which are not prime to I. In this paper we investigate some interesting properties of S(I) and introduce the total identity-summand graph of a semiring R with respect to a co-ideal I. It is the graph with all elements of R as vertices and for distinct x, $y{\in}R$, the vertices x and y are adjacent if and only if $xy{\in}S(I)$.
THE IDENTITY-SUMMAND GRAPH OF COMMUTATIVE SEMIRINGS
Atani, Shahabaddin Ebrahimi,Hesari, Saboura Dolati Pish,Khoramdel, Mehdi Korean Mathematical Society 2014 대한수학회지 Vol.51 No.1
An element r of a commutative semiring R with identity is said to be identity-summand if there exists $1{\neq}a{\in}R$ such that r+a = 1. In this paper, we introduce and investigate the identity-summand graph of R, denoted by ${\Gamma}(R)$. It is the (undirected) graph whose vertices are the non-identity identity-summands of R with two distinct vertices joint by an edge when the sum of the vertices is 1. The basic properties and possible structures of the graph ${\Gamma}(R)$ are studied.
TOTAL GRAPH OF A COMMUTATIVE SEMIRING WITH RESPECT TO IDENTITY-SUMMAND ELEMENTS
Atani, Shahabaddin Ebrahimi,Hesari, Saboura Dolati Pish,Khoramdel, Mehdi Korean Mathematical Society 2014 대한수학회지 Vol.51 No.3
Let R be an I-semiring and S(R) be the set of all identity-summand elements of R. In this paper we introduce the total graph of R with respect to identity-summand elements, denoted by T(${\Gamma}(R)$), and investigate basic properties of S(R) which help us to gain interesting results about T(${\Gamma}(R)$) and its subgraphs.
THE IDENTITY-SUMMAND GRAPH OF COMMUTATIVE SEMIRINGS
Shahabaddin Ebrahimi Atani,Saboura Dolati Pish Hesari,Mehdi Khoramdel 대한수학회 2014 대한수학회지 Vol.51 No.1
An element r of a commutative semiring R with identity is said to be identity-summand if there exists 1 ≠ α ∈ R such that r+a = 1. In this paper, we introduce and investigate the identity-summand graph of R, denoted by Γ(R). It is the (undirected) graph whose vertices are the non-identity identity-summands of R with two distinct vertices joint by an edge when the sum of the vertices is 1. The basic properties and possible structures of the graph Γ(R) are studied.
TOTAL GRAPH OF A COMMUTATIVE SEMIRING WITH RESPECT TO IDENTITY-SUMMAND ELEMENTS
Shahabaddin Ebrahimi Atani,Saboura Dolati Pish Hesari,Mehdi Khoramdel 대한수학회 2014 대한수학회지 Vol.51 No.3
Let R be an I-semiring and S(R) be the set of all identity- summand elements of R. In this paper we introduce the total graph of R with respect to identity-summand elements, denoted by T(Γ(R)), and investigate basic properties of S(R) which help us to gain interesting results about T(Γ(R)) and its subgraphs.
TOTAL IDENTITY-SUMMAND GRAPH OF A COMMUTATIVE SEMIRING WITH RESPECT TO A CO-IDEAL
Shahabaddin Ebrahimi Atani,Saboura Dolati Pish Hesari,Mehdi Khoramdel 대한수학회 2015 대한수학회지 Vol.52 No.1
Let R be a semiring, I a strong co-ideal of R and S(I) the set of all elements of R which are not prime to I. In this paper we investigate some interesting properties of S(I) and introduce the total identity-summand graph of a semiring R with respect to a co-ideal I. It is the graph with all elements of R as vertices and for distinct x, y ∈ R, the vertices x and y are adjacent if and only if xy ∈ S(I).