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Laser induced surface processing with gold nanoparticle arrays embedded in a transparent matrix
, Article Nano ; Volume 8, Issue 1 , January , 2013 ; 17932920 (ISSN) ; Bahrampour, A. R ; Sharif University of Technology
2013
Abstract
Gold nanoparticles are widely used as high efficient photon-thermal energy converters in a broad range of applications. This paper presents a theoretical investigation on using the optothermal properties of gold nanoparticle arrays to generate nanoscale molten and rubbery regions on the surface of an amorphous polymeric film. Nanoparticles are assumed to be embedded in a transparent silica layer and illuminated with a 7.5 ns pulsed laser at 532 nm. Simulation results are presented for systems with single gold nanoparticles, dimers and chains. Both electromagnetic and thermal interaction between nanoparticles are found to be important factors in determining the result of surface processing....
Synthesis of polypropylene/clay nanocomposites using bisupported Ziegler-Natta catalyst
, Article Journal of Applied Polymer Science ; Volume 115, Issue 1 , 2010 , Pages 308-314 ; 00218995 (ISSN) ; Tavakolzadeh, F ; Baniasadi, H ; Sharif University of Technology
Abstract
In this article, preparation of polypropylene/clay nanocomposites (PPCNC) via in situ polymerization is investigated. MgCl2/montmorillonite bisupported Ziegler-Natta catalyst was used to prepare PPCNC samples. Montmorillonite (MMT) was used as an inert support and reinforcement agent. The nanostructure of the composites was characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy techniques. Obtained results showed that silica layers of the MMT in these PPCNC were intercalated, partially exfoliated, and uniformly dispersed in the polypropylene matrix. Thermogravimetric analysis showed good thermal stability for the prepared PPCNC. Differential...
In situ polymerization of polyethylene/clay nanocomposites using a novel clay-supported ziegler-natta catalyst
, Article Polymer Composites ; Volume 30, Issue 10 , 2009 , Pages 1388-1393 ; 02728397 (ISSN) ; Tavakolzadeh, F ; Baniasadi, H ; Sharif University of Technology
2009
Abstract
Polyethylene/clay nanocomposites (PECNC) were synthesized via in situ Ziegler-Natta catalyst polymerization. Activated catalyst for polymerization of ethylene monomer has been prepared at first by supporting of the cocatalyst on the montmorillonite (MMT) smectite type clay and then active complex for polymerization formed by reaction of TiCl4 and aluminum oxide compound on the clay. Acid wash treatment has been used for increasing hydroxyl group and porosity of the clay and subsequently activity of the catalyst. The nano- structure of composites was investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Obtained results show that silica layers of the mineral clay...