Relaxation of excitations in porous silica gels

1988 ◽  
Vol 128 (1) ◽  
pp. 199-207 ◽  
Author(s):  
J.M. Drake ◽  
P. Levitz ◽  
S.K. Sinha ◽  
J. Klafter
Keyword(s):  
Porous Silica ◽  
Silica Gels

Effect of Sodium Ions on the Dielectric Conductivity of Porous Silica in Humid Environments

1990 ◽  
Vol 195 ◽  
Author(s):  
Wanqing Cao ◽  
Rosario Gerhardt ◽  
John B. Wachtman
Keyword(s):  
Relative Humidity ◽  
Silica Surface ◽  
Porous Silica ◽  
Sodium Content ◽  
Silica Gels ◽  
Interfacial Region ◽  
Relaxation Processes ◽  
Sodium Ions ◽  
Frequency Range ◽  
Dielectric Conductivity

ABSTRACTPartially sintered silica gels were immersed in different NaCI solutions to deliberately introduce a small amount of sodium ions ranging from 387 to 9900 ppm. Dielectric measurements were carried out in the frequency range 12 to 107Hz under various relative humidity conditions. Two relaxation processes were observed in the impedance and modulus planes and were assigned to two separate regions in the hydrated silica surface. The top region is expected to be rich in hydrated sodium since its modulus relaxation time depends strongly on the relative humidity as well as the sodium content. The interfacial region is believed to be composed of structured water since its dielectric conductivity is affected mainly by the amount of water adsorbed on the pore surfaces.

Selective adsorption and stable solidification of radioactive cesium ions by porous silica gels loaded with insoluble ferrocyanides

2014 ◽  
Vol 57 (11) ◽  
pp. 1470-1476 ◽  
Author(s):  
XiangBiao Yin ◽  
Yan Wu ◽  
Hitoshi Mimura ◽  
Yuichi Niibori ◽  
YueZhou Wei
Keyword(s):  
Selective Adsorption ◽  
Porous Silica ◽  
Silica Gels ◽  
Radioactive Cesium ◽  
Cesium Ions

A NMR investigation of adsorption/desorption hysteresis in porous silica gels

1998 ◽  
Vol 16 (5-6) ◽  
pp. 679-682 ◽  
Author(s):  
P Porion ◽  
A.M Faugère ◽  
P Levitz ◽  
H Van Damme ◽  
A Raoof ◽  
...  
Keyword(s):  
Porous Silica ◽  
Silica Gels ◽  
Desorption Hysteresis ◽  
Adsorption Desorption

Preparation and in vitro evaluation of porous silica gels

Biomaterials ◽  
2002 ◽  
Vol 23 (21) ◽  
pp. 4277-4284 ◽  
Author(s):  
Janet Gallardo ◽  
Pablo G Galliano ◽  
J.M.Porto López
Keyword(s):  
Porous Silica ◽  
Silica Gels ◽  
In Vitro Evaluation

Sol-Gel Derived Porous Silica Gels Impregnated with Sulfuric Acid

2002 ◽  
Vol 149 (8) ◽  
pp. E292 ◽  
Author(s):  
Atsunori Matsuda ◽  
Takao Kanzaki ◽  
Kiyoharu Tadanaga ◽  
Toshiro Kogure ◽  
Masahiro Tatsumisago ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Sol Gel ◽  
Porous Silica ◽  
Silica Gels

Magnetic properties of Cu-doped porous silica gels study by magnetic resonances

1995 ◽  
Vol 189 (1-2) ◽  
pp. 101-106 ◽  
Author(s):  
E. Duval ◽  
C. Bovier ◽  
H. Roux ◽  
J. Serughetti ◽  
A. Tuel ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Porous Silica ◽  
Silica Gels ◽  
Magnetic Resonances
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