scholarly journals Synthesis of Poly(styrene-acrylates-acrylic acid) Microspheres and Their Chemical Composition towards Colloidal Crystal Films

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Luis A. Ríos-Osuna ◽  
Angel Licea-Claverie ◽  
F. Paraguay-Delgado ◽  
Norma A. Cortez-Lemus
Keyword(s):  
Chemical Composition ◽  
Colloidal Crystal ◽  
Core Shell ◽  
Large Decrease ◽  
Dsc Analysis ◽  
Adhesive Properties ◽  
Sensing Applications ◽  
Crystal Films ◽  
Core Shell Structure ◽  
Comonomer Content

In this paper, polystyrene colloidal microspheres have been prepared using hexyl acrylate (HA), ethylhexyl acrylate (EHA), isooctyl acrylate (IOA), butyl acrylate (BA), or isobutyl acrylate (IBA) as comonomers. Microspheres with diameters from 212 to 332 nm and with a polystyrene content of 65–78% were prepared. The particles prepared in this work do not present the typical core-shell structure; as a consequence, DSC analysis showed that the microspheres exhibited only one Tg. TEM images show that the particles with comonomer content below ~30% were spherical and regular. Microspheres containing comonomer between 21 to 25% produced the less brittle films showing very iridescent colors. The films prepared from microspheres containing hexyl, ethylhexyl, and isooctyl acrylate as comonomers are firmly attached to the substrate due to their adhesive properties. The large decrease of the fragility observed in these films makes them much more attractive materials in sensing applications.

scholarly journals Preceramic core-shell particles for the preparation of hybrid colloidal crystal films by melt-shear organization and conversion into porous ceramics

2018 ◽  
Vol 160 ◽  
pp. 926-935 ◽  
Author(s):  
Steffen Vowinkel ◽  
Anna Boehm ◽  
Timmy Schäfer ◽  
Torsten Gutmann ◽  
Emanuel Ionescu ◽  
...  
Keyword(s):  
Colloidal Crystal ◽  
Porous Ceramics ◽  
Core Shell ◽  
Crystal Films ◽  
Shell Particles

Synthesis and Basic Properties of Fluorinated Core-Shell Acrylic Latexes Containing Perfluoroalkyl Acrylate in the Shell

2013 ◽  
Vol 339 ◽  
pp. 665-669
Author(s):  
Quan Liu ◽  
Wei Ming Tang ◽  
Yi Chi Chen ◽  
Min Huang
Keyword(s):  
Corrosion Resistance ◽  
Fourier Transform ◽  
Free Radical ◽  
Chemical Composition ◽  
Core Shell ◽  
Emulsion Copolymerization ◽  
Basic Properties ◽  
Acrylic Monomers ◽  
Core Shell Structure ◽  
Acrylic Latexes

Fluoroacrylic copolymer latexes with core-shell structure were synthesized by free-radical emulsion copolymerization, using fluorine-containing acrylic monomer of dodecafluoroheptyl methacrylate (DFMA) and fluorine-free acrylic monomers. The chemical composition was characterized by Fourier transform infrared (FTIR) spectroscopy. The basic properties of the latexes including mainly hydrophobicity, chemical stability, chemicals-and corrosion-resistance were investigated. Significant improvement in the chemicals-and corrosion-resistance were observed for the fluorinated copolymer although only 5 wt% (based on the total monomers amount) of DFMA was copolymerized.

TEM Failure Analysis and Root Cause Understanding of Nitride Spacer Bridging in 45 nm Semiconductor Manufacturing Processes

2012 ◽  
Author(s):  
Liu Binghai ◽  
Mo Zhiqiang ◽  
Zhao Si Ping ◽  
Yao Yuan ◽  
Teo Kim Hong ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Failure Analysis ◽  
Shell Structure ◽  
Semiconductor Manufacturing ◽  
Manufacturing Processes ◽  
Core Shell ◽  
Root Cause ◽  
Core Shell Structure

Abstract Abnormal inline defects were caught after nitride spacer etching processes. Detailed MEBES layout checking and inline SEM inspection revealed that such defects always appeared at the boundaries in between PFETs and NFETs regions. The microstructure and chemical composition of the defects were analyzed in detail by various TEM imaging and microanalysis techniques. The results indicated that the defect possessed core-shell structure, with oxide core and nitride shell. Based on the TEM failure analysis results and manufacturing processes, we conclude that the defects originated from PR fencing due to the PR hardening during PFET and NFET LDD/Halo implantation. The oxide core was generated during oxide spacer formation using an ozone-TEOS process, which was responsible for the nitride spacer under-etch issue.

Synthesis, Morphology and Hydrophobicity of Core-Shell Fluoinated Copolymer Latexes

2013 ◽  
Vol 456 ◽  
pp. 471-473
Author(s):  
Ping Guo ◽  
Xiao Zhao ◽  
Zheng Gang Xiao
Keyword(s):  
Contact Angle ◽  
Water Absorption ◽  
Chemical Structure ◽  
Core Shell ◽  
Dsc Analysis ◽  
Seeded Emulsion Polymerization ◽  
Water Contact ◽  
Absorption Ratio ◽  
Transmission Electron ◽  
Core Shell Structure

The fluoroacrylate copolymer latexes (Poly (BA-MMA-DFMA) latex) with a fluorinated shell were successfully synthesized by semi-continuous seeded emulsion polymerization. The chemical structure of the latex was characterized by Fourier transform infrared (FTIR) and 1H-NMR analysis. Glass transition temperatures (Tg) of Poly (BA-MMA-DFMA) latex were confirmed by DSC analysis. Transmission electron microscopy (TEM) showed the microstructure of Poly (BA-MMA-DFMA) latex. The water absorption ratio and the water contact angle (WCA) of films were studied. Results showed the Poly (BA-MMA-DFMA) latex had two distinct Tg and exhibited core-shell structure. Moreover, Poly (BA-MMA-DFMA) film with 15wt% DFMA can exhibit lower water absorption ratio and higher contact angle.

Well-defined colloidal crystal films from the 2D self-assembly of core–shell semi-soft nanoparticles

2015 ◽  
Vol 6 (41) ◽  
pp. 7297-7307 ◽  
Author(s):  
Hadi Sabouri ◽  
Kohji Ohno ◽  
Sébastien Perrier
Keyword(s):  
Self Assembly ◽  
Colloidal Crystal ◽  
Colloidal Crystals ◽  
Core Shell ◽  
Polymer Shell ◽  
Crystal Films ◽  
Silica Core ◽  
Shell Particles ◽  
Soft Nanoparticles ◽  
Core Polymer

Silica core–polymer shell particles are obtained from surface mediated RAFT polymerisation and assembled into ordered 2D colloidal crystals.

Selective Chemical Sensing Using Structurally Colored Core-Shell Colloidal Crystal Films

2008 ◽  
Vol 8 (6) ◽  
pp. 815-822 ◽  
Author(s):  
Radislav A. Potyrailo ◽  
Zhebo Ding ◽  
Matthew D. Butts ◽  
Sarah E. Genovese ◽  
Tao Deng
Keyword(s):  
Chemical Sensing ◽  
Colloidal Crystal ◽  
Core Shell ◽  
Crystal Films ◽  
Selective Chemical

Electrical Conductivity of Ni-YSZ Anode for SOFCs According to the Ni Powder Size Variations in Core-shell Structure

2015 ◽  
Vol 53 (4) ◽  
pp. 287-293
Author(s):  
Byung-Hyun Choi ◽  
Young Jin Kang ◽  
Sung-Hun Jung ◽  
Yong-Tae An ◽  
Mi-Jung Ji
Keyword(s):  
Electrical Conductivity ◽  
Shell Structure ◽  
Core Shell ◽  
Powder Size ◽  
Ni Powder ◽  
Core Shell Structure

Preparation of Porous Core/Shell Structure Fe$lt;inf$gt;2$lt;/inf$gt;O$lt;inf$gt;3$lt;/inf$gt;/Al Nanothermite Membrane by Template Method

2015 ◽  
Vol 30 (6) ◽  
pp. 610 ◽  
Author(s):  
ZHENG Guo-Qiang ◽  
ZHANG Wen-Chao ◽  
XU Xing ◽  
SHEN Rui-Qi ◽  
DENG Ji-Ping ◽  
...  
Keyword(s):  
Shell Structure ◽  
Template Method ◽  
Core Shell ◽  
Porous Core ◽  
Core Shell Structure

Functional properties of BaTiO3–Ni0.5Zn0.5Fe2O4 magnetoelectric ceramics prepared from powders with core-shell structure

2010 ◽  
Vol 107 (10) ◽  
pp. 104106 ◽  
Author(s):  
L. P. Curecheriu ◽  
M. T. Buscaglia ◽  
V. Buscaglia ◽  
L. Mitoseriu ◽  
P. Postolache ◽  
...  
Keyword(s):  
Functional Properties ◽  
Shell Structure ◽  
Core Shell ◽  
Core Shell Structure
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