Critical Roles of Cationic Surfactants in the Preparation of Colloidal Mesostructured Silica Nanoparticles: Control of Mesostructure, Particle Size, and Dispersion

2014 ◽  
Vol 6 (5) ◽  
pp. 3491-3500 ◽  
Author(s):  
Hironori Yamada ◽  
Chihiro Urata ◽  
Sayuri Higashitamori ◽  
Yuko Aoyama ◽  
Yusuke Yamauchi ◽  
...  
Keyword(s):  
Particle Size ◽  
Silica Nanoparticles ◽  
Cationic Surfactants ◽  
Mesostructured Silica

Effects of Particles Size of Nanosilica on Properties of Polybenzoxazine Nanocomposites

2015 ◽  
Vol 659 ◽  
pp. 394-398 ◽  
Author(s):  
Nutthaphon Liawthanyarat ◽  
Sarawut Rimdusit
Keyword(s):  
Particle Size ◽  
Silica Nanoparticles ◽  
Primary Particle ◽  
Mechanical And Thermal Properties ◽  
Particle Sizes ◽  
Barrier Effect ◽  
Degradation Temperature ◽  
Maximum Value ◽  
Wetting Behaviors ◽  
Composite Samples

Polybenzoxazine nanocomposites filled with three different sizes of silica nanoparticles are investigated for their mechanical and thermal properties. In this research, silica nanoparticles with primary particle sizes of 7, 14 and 40 nm were incorporated in polybenzoxazine matrix at a fixed content of 3% by weight. From the experimental results, the storage modulus of the polybenzoxazine nanocomposite was found to systematically increase with decreasing the particle sizes of nanosilica suggesting better reinforcement of the smaller particles. Glass transition temperature was found to slightly increase with the addition of the silica nanoparticles. The uniformity of the composite samples were also evaluated by thermogravimetric analysis to show good dispersion of the silica nanoparticles in the composite samples as a result of high processability of the benzoxazine resin used i.e. low A-stage viscosity with good wetting behaviors. Degradation temperature at 5% weight loss (Td,5) of polybenzoxazine nanocomposites filled with different particle sizes of silica nanoparticles was found to increase from the value of 325 °C of the neat polybenzoxazine to the maximum value of about 340 °C with an addition of the nanosilica of the smallest particle size used. Finally, the smaller nanosilica particle size was also found to show more pronounced effect on Td,5enhancement of the composite samples as a result of greater barrier effect from larger surface area of the smaller particles.

scholarly journals Synthesis of colloidal Janus nanoparticles by asymmetric capping of mesoporous silica with phenylsilsesquioxane

2015 ◽  
Vol 51 (15) ◽  
pp. 3211-3214 ◽  
Author(s):  
Hiroto Ujiie ◽  
Atsushi Shimojima ◽  
Kazuyuki Kuroda
Keyword(s):  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Aqueous Dispersion ◽  
Composite Nanoparticles ◽  
Mesostructured Silica ◽  
Janus Nanoparticles

Janus-type mesoporous silica nanoparticles asymmetrically capped with non-porous phenylsilsesquioxane have been prepared by simply adding phenyltriethoxysilane to an aqueous dispersion of mesostructured silica–surfactant composite nanoparticles.

scholarly journals Highly active Ni-promoted mesostructured silica nanoparticles for CO2 methanation

2014 ◽  
Vol 147 ◽  
pp. 359-368 ◽  
Author(s):  
M.A.A. Aziz ◽  
A.A. Jalil ◽  
S. Triwahyono ◽  
R.R. Mukti ◽  
Y.H. Taufiq-Yap ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Co2 Methanation ◽  
Mesostructured Silica ◽  
Highly Active

Rice Hull Micro and Nanosilica: Synthesis and Characterization

2016 ◽  
Vol 718 ◽  
pp. 77-80 ◽  
Author(s):  
Worawat Jansomboon ◽  
Khatawut Boonmaloet ◽  
Suradet Sukaros ◽  
Paweena Prapainainar
Keyword(s):  
Particle Size ◽  
Silica Nanoparticles ◽  
Sodium Silicate ◽  
Silica Particle ◽  
Precipitation Method ◽  
Rice Hull ◽  
Synthesis And Characterization ◽  
Natural Material ◽  
Silica Microparticles ◽  
Temperature Levels

Rice hull is a by-product natural material composing of high amount of silica. In this work, silica microparticles were synthesized from rice hull using 3 temperature levels of calcination at 500, 600, and 850 ºC. Then, they were transformed to silica nanoparticles by precipitation method using sodium silicate as an initial substance synthesized from rice hull. Finally, the properties of silica particle were studied such as characteristics, morphology of particle, component, and size of silica. The result showed the silica structure became more crystalline when the temperature was increased. When the concentration of sodium silicate increased, more agglutination occurred in the silica structure. The results also indicated that the particle size and component of silica synthesized by heating rice hull at 600 ºC followed by precipitation method were the same as those of commercial silica.

Blood clot initiation by mesoporous silica nanoparticles: dependence on pore size or particle size?

2016 ◽  
Vol 4 (44) ◽  
pp. 7146-7154 ◽  
Author(s):  
Zihao Chen ◽  
Fan Li ◽  
Changjun Liu ◽  
Jing Guan ◽  
Xiao Hu ◽  
...  
Keyword(s):  
Particle Size ◽  
Mesoporous Silica ◽  
Pore Size ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Blood Clot

The hemostatic efficiency of mesoporous silica nanoparticles depends on pore size more than particle size, and biocompatibility is more related to particle size.

CO2 REFORMING OF METHANE OVER NI SUPPORTED ON MESOSTRUCTURED SILICA NANOPARTICLES (NI/MSN): EFFECT OF NI LOADING

2016 ◽  
Vol 78 (8-3) ◽  
Author(s):  
Siti Munirah Sidik ◽  
Aishah Abdul Jalil ◽  
Sugeng Triwahyono ◽  
Umi Aisah Asli
Keyword(s):  
Nickel Oxide ◽  
Silica Nanoparticles ◽  
High Catalytic Activity ◽  
X Ray Diffraction ◽  
Co2 Reforming ◽  
Co2 Reforming Of Ch4 ◽  
Mesostructured Silica ◽  
Physical Mixing ◽  
Mixing Method ◽  
Adsorption Desorption

A series of Ni incorporated Mesostructured Silica Nanoparticles (MSN) were prepared by physical mixing method. Electrolyzed nickel oxide was used as the Ni precursor. The N2 adsorption-desorption and X-Ray diffraction (XRD) analyses evidenced that the increase in Ni loading decreased the surface area and crystallinity, and increased Ni particle size in the catalyst, respectively. The activity of CO2 reforming of CH4 followed the order of 10Ni/MSN > 15Ni/MSN > 5Ni/MSN > MSN. The highest activity was achieved by 10Ni/MSN with the CH4 and CO2 conversion of 63.4% and 87.2 %, respectively. The results indicated that the presence of a suitable Ni amount in MSN was beneficial to achieve high catalytic activity due to its effect on the amount of active metal sites available for the reaction. Thus, the electrolyzed nickel oxide precursor and Ni/MSN catalyst prepared by electrochemical method and physical mixing synthesis has a potential to be utilized in CO2 reforming of CH4.

scholarly journals The modelling of the toughening of epoxy polymers via silica nanoparticles: The effects of volume fraction and particle size

Polymer ◽  
2013 ◽  
Vol 54 (26) ◽  
pp. 7022-7032 ◽  
Author(s):  
D.J. Bray ◽  
P. Dittanet ◽  
F.J. Guild ◽  
A.J. Kinloch ◽  
K. Masania ◽  
...  
Keyword(s):  
Particle Size ◽  
Silica Nanoparticles ◽  
Volume Fraction ◽  
Epoxy Polymers

Multistep Organic Transformations over Base-Rhodium/Diamine-Bifunctionalized Mesostructured Silica Nanoparticles

ChemCatChem ◽  
2017 ◽  
Vol 9 (16) ◽  
pp. 3197-3202 ◽  
Author(s):  
Hang Liao ◽  
Yajie Chou ◽  
Yu Wang ◽  
Han Zhang ◽  
Tanyu Cheng ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Organic Transformations ◽  
Mesostructured Silica
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