Loading...
Search for:
core-shell-particle
0.006 seconds
Wet spinning of low gel content SBR/PMMA core/shell particles dispersed in a good solvent for the shell
, Article Polymer ; Volume 44, Issue 14 , 2003 , Pages 4011-4019 ; 00323861 (ISSN) ; Mohammadi, N ; Bagheri, R ; Ghaffarian, S. R ; Sharif University of Technology
Elsevier BV
2003
Abstract
A low gel content poly (styrene-ran-butadiene)/poly (methyl methacrylate) (SBR/PMMA) core/shell particles dispersed in a good solvent for the shell was wet spun into a coagulation bath at room temperature. The SEM micrographs of as spun fibers showed various surface topographies and fiber diameters, ranging from 4.2 up to 20 μm depend upon the draw ratio. The osmium tetroxide stained cross-section of fibers observed by transmission electron microscope (TEM), indicated a heterogeneous morphology consisting of dark cores and fairly light shells, which is a result of self-stratification to an overall core/shell morphology in fiber cross-section. The inner core consisted of higher concentration...
Dielectric core-shells with enhanced scattering efficiency as back-reflectors in dye sensitized solar cells
, Article RSC Advances ; Vol. 4, issue. 7 , Oct , 2014 , p. 3621-3626 ; Majles Ara M.H ; Tajabadi F ; Dabirian, A ; Mohammadpour, R ; Taghavinia, N ; Sharif University of Technology
Abstract
Particulate back-reflector films are conventionally used for the improvement of light harvesting in dye solar cells (DSC). The back-reflection of the films is directly related to the scattering efficiency of the individual particles. Inspired by the idea of multilayer optical thin films, here it is demonstrated theoretically and experimentally that putting a SiO2 shell around spherical rutile-TiO2 particles leads to improved light scattering by the particles. These dielectric core-shells not only enhance the overall diffuse reflection of the films, but they also cause a relative improvement in the red and near infrared regions. Back-reflector films of these core-shell particles employed in...
Self-assembled monolayer of wavelength-scale core-shell particles for low-loss plasmonic and broadband light trapping in solar cells
, Article ACS Applied Materials and Interfaces ; Volume 8, Issue 1 , 2016 , Pages 247-255 ; 19448244 (ISSN) ; Malekshahi Byranvand, M ; Naqavi, A ; Nemati Kharat, A ; Taghavinia, N ; Sharif University of Technology
American Chemical Society
Abstract
Scattering particles constitute a key light trapping solution for thin film photovoltaics where either the particles are embedded in the light absorbing layer or a thick layer of them is used as a reflector. Here we introduce a monolayer of wavelength-scale core-shell silica@Ag particles as a novel light trapping strategy for thin film photovoltaics. These particles show hybrid photonic-plasmonic resonance modes that scatter light strongly and with small parasitic absorption losses in Ag (<1.5%). In addition, their scattering efficiency does not vary significantly with the refractive index of the surrounding medium. A monolayer of these particles is applied as the top-scattering layers in a...
Improvement of polymer flooding using in-situ releasing of smart nano-scale coated polymer particles in porous media
, Article Energy Exploration and Exploitation ; Volume 30, Issue 6 , 2012 , Pages 915-940 ; 01445987 (ISSN) ; Ramazani, S. A. A ; Sadeghnejad, S ; Sharif University of Technology
2012
Abstract
The main purpose of this paper is modeling and simulation of in-situ releasing of smart nano-sized core-shell particles at the water-oil interface during polymer flooding. During the polymer flooding process, when these nano-particles reach the water-oil interface, migrate to the oil phase and the hydrophobic layer of them dissolves in this phase. After dissolution of this protective nano-sized layer, the hydrophilic core containing a water-soluble ultra high molecular weight polymer diffuses back into the water phase and with dissolving in this phase, dramatically increases viscosity of flooding water in the neighborhood of the water-oil interface. In this study, two different...