Synthesis and characterization of mesoporous bioactive glasses with highly ordered structures and high surface areas by a self-assembly process

2019 ◽  
Vol 517 ◽  
pp. 1-8 ◽  
Author(s):  
Zhenning Wu ◽  
Xiang Zhou ◽  
Yin Zhang ◽  
Jiapan Luan ◽  
Xiaoran Yang ◽  
...  
Keyword(s):  
Self Assembly ◽  
High Surface ◽  
Synthesis And Characterization ◽  
Assembly Process ◽  
Bioactive Glasses ◽  
Ordered Structures ◽  
Surface Areas

Synthesis and Characterization of Aerogel-derived Cation-substituted Hexaaluminates

1996 ◽  
Vol 457 ◽  
Author(s):  
Lin-chiuan Yan ◽  
Levi T. Thompson
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Catalytic Combustion ◽  
High Surface ◽  
High Surface Area ◽  
Synthesis And Characterization ◽  
New Methods ◽  
Surface Areas ◽  
Different Characteristics

ABSTRACTNew methods have been developed for the synthesis of high surface area cation-substituted hexaaluminates. These materials were prepared by calcining high temperature (ethanol extraction) or low temperature (CO2 extraction) aerogels at temperatures up to 1600°C. Cation-substituted hexaaluminates have emerged as promising catalysts for use in high temperature catalytic combustion. In comparing unsubstituted and cation-substituted hexaaluminates, we found that the phase transformations were much cleaner for the cation-substituted materials. BaCO3 and BaAl2O4 were intermediates during transformation of the unsubstituted materials, while the cation-substituted materials transformed directly from an amorphous phase to crystalline hexaaluminate. Moreover, the presence of substitution cations caused the transformation to occur at lower temperatures. Mn seems to be a better substitution cation than Co since the Mn-substituted materials exhibited higher surface areas and better heat resistances than the Co-substituted materials. The low temperature aerogel-derived materials possessed quite different characteristics from the high temperature aerogel-derived materials. For example, phase transformation pathways were different.

Characterization of Dielectric Nanocubes Ordered Structures Fabricated by Solution Self-Assembly Process

2011 ◽  
Vol 50 (9S2) ◽  
pp. 09NC09 ◽  
Author(s):  
Ken-ichi Mimura ◽  
Feng Dang ◽  
Kazumi Kato ◽  
Hiroaki Imai ◽  
Satoshi Wada ◽  
...  
Keyword(s):  
Self Assembly ◽  
Assembly Process ◽  
Ordered Structures

scholarly journals Self-Assembly of Cholesterol-Containing Water-Soluble Polymers

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Shin-ichi Yusa
Keyword(s):  
Self Assembly ◽  
Liquid Crystalline ◽  
Amphiphilic Polymers ◽  
Water Soluble ◽  
Synthesis And Characterization ◽  
Ordered Structures ◽  
Water Soluble Polymers ◽  
Soluble Polymers ◽  
Nanotechnology Research

Self-assembly of amphiphilic polymers containing cholesteryl groups has proved to be attractive in the field of nanotechnology research. Some cholesterol derivatives are known to form ordered structures which indicate thermotropic and lyotropic liquid-crystalline, monolayers, multilayers, micelles, and liposomes. This paper involves the synthesis and characterization of various kinds of amphiphilic polymers bearing cholesteryl moieties.

Synthesis and Characterization of Molecular Sieve SBA-15 and Catalysts Co/SBA-15 and Ru/Co/SBA-15

2014 ◽  
Vol 798-799 ◽  
pp. 100-105 ◽  
Author(s):  
Jocielys Jovelino Rodrigues ◽  
Liliane Andrade Lima ◽  
Gustavo Medeiros de Paula ◽  
Meiry Glaúcia Freire Rodrigues
Keyword(s):  
Molecular Sieve ◽  
High Surface ◽  
Nitrogen Adsorption ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Surface Areas ◽  
Bet Method ◽  
Superficial Area

A series of mesoporous materials have been synthesized in an acid medium, with various structures, such as SBA-15. These materials have many properties which make them potential catalysts. Among these we highlight their high surface areas and pore walls relatively thick, resulting in a greater hydrothermal stability. This work aims at the synthesis and characterization of molecular sieve SBA-15 with molar composition: 1.0 TEOS: 0.017 P123: 5.7 HCl: 193 H2O and Co/SBA-15 and catalysts for the reaction of Ru/Co/SBA-15 Fischer Tropsch process. The materials were characterized by the techniques of X-ray diffraction (XRD), chemical analysis by X-ray spectrometry, energy dispersive (EDX) and Nitrogen adsorption (BET method). X-ray diffraction showed that the calcined cobalt catalyst did not modify the structure of SBA-15 and that Co was present under the form of Co3O4 in the catalyst. The addition of cobalt in the SBA-15 decreased the specific superficial area of the molecular sieve.

Synthesis and Characterization of Poly(o-chloroaniline) Micro/Nanostructures in a Novel Redox System

2015 ◽  
Vol 1120-1121 ◽  
pp. 215-219
Author(s):  
Meng Zhang ◽  
Dong Hao Sun ◽  
Ying Wang
Keyword(s):  
Thermal Stability ◽  
Ascorbic Acid ◽  
Self Assembly ◽  
Redox System ◽  
Ammonium Persulfate ◽  
Polymerization Rate ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
Assembly Process

In a redox system containing ascorbic acid(AA) and ammonium persulfate(APS), Poly(o-chloroaniline)(POC) micro/nanostructures including nanoparticles, nanofibers, and microspheres were successfully prepared through a self-assembly process in absence of additional template. The results indicated that POC morphologies were strongly affected by the molar ratio of o-chloroaniline(OC) to ascorbic acid([OC]/[AA]) and the reaction temperature. The fibrillar or spherical POC micro/nanostructures could be dynamically controlled in the AA/APS redox system by changing the polymerization rate of OC monomers. Thermogravimetric analysis showed that the POC nanofibers had a better thermal stability than POC microspheres. The conductivity of POC nanofibers could reach 5.5×10-3S/cm, while the microspheres were almost insulators.

Characterization of Dielectric Nanocubes Ordered Structures Fabricated by Solution Self-Assembly Process

2011 ◽  
Vol 50 (9) ◽  
pp. 09NC09 ◽  
Author(s):  
Ken-ichi Mimura ◽  
Feng Dang ◽  
Kazumi Kato ◽  
Hiroaki Imai ◽  
Satoshi Wada ◽  
...  
Keyword(s):  
Self Assembly ◽  
Assembly Process ◽  
Ordered Structures

Synthesis and characterization of novel dibenz[a,c]anthracenedicarboxythioimides: the effect of thionation on self-assembly

RSC Advances ◽  
2016 ◽  
Vol 6 (82) ◽  
pp. 78784-78790 ◽  
Author(s):  
Katie. M. Psutka ◽  
Kenneth E. Maly
Keyword(s):  
Self Assembly ◽  
Liquid Crystalline ◽  
Synthesis And Characterization ◽  
Crystalline Phases ◽  
Liquid Crystalline Phases ◽  
Self Association

The effect of thionation on the formation of columnar liquid crystalline phases of dibenzanthracenedicarboximides as well as their self-association in solution is described.

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