Porosity of mesoporous silica thin films: Kinetics of the template removal process by ellipsometry

2007 ◽  
Vol 126 (1) ◽  
pp. 168-173 ◽  
Author(s):  
M LOSURDO ◽  
M GIANGREGORIO ◽  
G BRUNO ◽  
F POLI ◽  
L ARMELAO ◽  
...  
Keyword(s):  
Thin Films ◽  
Mesoporous Silica ◽  
Template Removal ◽  
Removal Process ◽  
Silica Thin Films ◽  
Kinetics Of

Molecular Simulation of Adsorbed Water on Mesoporous Silica Thin Films

2013 ◽  
Author(s):  
Kyohei Yamashita ◽  
Hirofumi Daiguji
Keyword(s):  
Thin Films ◽  
Mesoporous Silica ◽  
Water Adsorption ◽  
Pore Radius ◽  
Md Simulations ◽  
Adsorption Properties ◽  
Pore Surface ◽  
Silica Thin Films ◽  
Adsorption Layers ◽  
Kinetics Of

Grand canonical Monte Carlo (GCMC) and canonical ensemble molecular dynamics (NVT-MD) simulations were performed to investigate water adsorption properties in mesoporous silica thin films. The effect of pore radius on the adsorption properties was assessed using two models of mesoporous silica thin films having different pore radius and film thickness (1.38 and 5.66 nm in Model 1, respectively, and 1.81 and 7.30 nm in Model 2, respectively). In the simulations, a water adsorption layer or water menisci were formed in a mesopore accompanying the growth or shrinkage of stable adsorption layers on the upper and lower surfaces. The stable two water adsorption layers were formed on the pore surface in both models. The curvature radius of a water meniscus decreased monotonically and approached a constant value. In addition, NVT-MD simulations were performed to investigate the kinetics of water uptake into a model of mesoporous silica thin film having a radius and thickness of 1.38 and 7.93 nm (Model 3). The calculation results showed that the kinetics of water uptake depended on the number of water molecules and there were two different transport mechanisms in the pore. One was diffusion of water along the pore surface, and the other was capillary rise of liquid water.

scholarly journals A Hierarchical Study on Load/Release Kinetics of Guest Molecules into/from Mesoporous Silica Thin Films

2011 ◽  
Vol 115 (14) ◽  
pp. 6581-6590 ◽  
Author(s):  
Hong-Yuan Lian ◽  
Yung-He Liang ◽  
Yusuke Yamauchi ◽  
Kevin C.-W. Wu
Keyword(s):  
Thin Films ◽  
Mesoporous Silica ◽  
Release Kinetics ◽  
Guest Molecules ◽  
Silica Thin Films ◽  
Load Release ◽  
Kinetics Of

Photo-orientation of Mesoporous Silica Thin Films on Photocrosslinkable Polymer Films

2005 ◽  
Vol 17 (8) ◽  
pp. 1035-1039 ◽  
Author(s):  
H. Fukumoto ◽  
S. Nagano ◽  
N. Kawatsuki ◽  
T. Seki
Keyword(s):  
Thin Films ◽  
Mesoporous Silica ◽  
Polymer Films ◽  
Silica Thin Films

scholarly journals One-Step Synthesis of Mesoporous Silica Thin Films Containing Available COOH Groups

ACS Omega ◽  
2017 ◽  
Vol 2 (8) ◽  
pp. 4548-4555 ◽  
Author(s):  
Ane Escobar ◽  
Luis Yate ◽  
Marek Grzelczak ◽  
Heinz Amenitsch ◽  
Sergio E. Moya ◽  
...  
Keyword(s):  
Thin Films ◽  
Mesoporous Silica ◽  
Silica Thin Films ◽  
One Step

scholarly journals Synthesis of Periodic Mesoporous Silica Thin Films

1996 ◽  
Vol 431 ◽  
Author(s):  
M. T. Anderson ◽  
J. E. Martin ◽  
J. G. Odinek ◽  
P. Newcomer
Keyword(s):  
Thin Films ◽  
Mesoporous Silica ◽  
Product Formation ◽  
Coating Solution ◽  
Homogeneous Solutions ◽  
Silica Thin Films ◽  
Initial Silica ◽  
Mesoporous Thin Films ◽  
Rapid Hydrolysis ◽  
Quartz Substrates

AbstractWe have synthesized periodic mesoporous silica thin films (PMSTF) from homogeneous solutions. To synthesize the films a thin layer of a pH = 7 micellar coating solution that contains TMOS is dip- or spin-coated onto silicon wafers, borosilicate glass, or quartz substrates. Ammonia gas is diffused into the solution and causes rapid hydrolysis and condensation of the TMOS and the formation of periodic mesoporous thin films within ∼10 seconds. The combination of homogeneous solutions and rapid product formation maximizes the concentration of desired product and provides a controlled, predictable microstructure. The films have been made continuous and crack-free by optimizing initial silica concentration and film thickness.

scholarly journals Preparation of W-Containing Mesoporous Silica Thin Films and Their Surface Hydrophilic Properties

2009 ◽  
Vol 7 ◽  
pp. 141-144 ◽  
Author(s):  
Yu Horiuchi ◽  
Takashi Kamegawa ◽  
Kohsuke Mori ◽  
Hiromi Yamashita ◽  
Norikazu Nishiyama
Keyword(s):  
Thin Films ◽  
Mesoporous Silica ◽  
Silica Thin Films

scholarly journals Increasing mechanical strength of mesoporous silica thin films by addition of tetrapropylammonium hydroxide and refluxing processes

2009 ◽  
Vol 517 (6) ◽  
pp. 2039-2043 ◽  
Author(s):  
Cheng-Tsung Tsai ◽  
Hsin-Yan Lu ◽  
Chih-Yuan Ting ◽  
Wen-Fa Wu ◽  
Ben-Zu Wan
Keyword(s):  
Thin Films ◽  
Mesoporous Silica ◽  
Mechanical Strength ◽  
Tetrapropylammonium Hydroxide ◽  
Silica Thin Films
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