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epoxide-ring-opening
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, M.Sc. Thesis Sharif University of Technology ; Bagherzadeh, Mojtaba (Supervisor)
Abstract
Inert gold become catalytically active when dispersed in the form of nanoparticles. Isolated gold nanoparticles have demonstrated high catalytic activity for both oxidation and reduction reactions. In order to obtain high catalytic activity, gold nanoparticles are generally dispersed on support materials, among which oxides are commonly used. However, a substantial decrease in activity and selectivity of the immobilized catalysts is frequently observed due to the heterogeneous nature of these support materials in reaction media. In the course of our study on the metal-based catalysis for synthesis of organic compounds, we herein report that rod-shaped Au nanoparticles in aqua solution...
Cure Kinetics of Nanodiamond-Filled Epoxy Resin: Influence of Nanodiamond Surface Functionality
, Article Industrial and Engineering Chemistry Research ; Volume 54, Issue 36 , August , 2015 , Pages 8954-8962 ; 08885885 (ISSN) ; Shojaei, A ; Bagheri, R ; Sharif University of Technology
American Chemical Society
2015
Abstract
Thermally oxidized nanodiamond (OND), amine-functionalized ND (AND) and untreated ND (UND) were added to epoxy/TETA at 1 wt % loading. The ND enhanced the dynamic storage modulus of epoxy while decreasing the glass transition temperature because of the increment of free volume in the vicinity of the ND surfaces. The ND induced an acceleration effect on the curing reaction which could be due to functional groups of the ND and lack of any steric hindrance on molecules by the ND particles themselves. The Vyazovkin model-free isoconversional method indicated that all NDs decreased the activation energy; among them, AND showed the lowest value because of the significant promotion of the epoxide...