Measurement of the diffusion coefficient of nickel nitrate in wet silica gel using UV/VIS spectroscope equipped with a flow cell

2000 ◽  
Vol 2 (6) ◽  
pp. 1199-1204 ◽  
Author(s):  
Ryoji Takahashi ◽  
Satoshi Sato ◽  
Toshiaki Sodesawa ◽  
Yumi Kamomae
Keyword(s):  
Diffusion Coefficient ◽  
Silica Gel ◽  
Flow Cell ◽  
Nickel Nitrate ◽  
Wet Silica Gel

scholarly journals Effect of Si Content on Diffusion Coefficient of Nickel Nitrate in Wet Silica Gel.

2001 ◽  
Vol 109 (1274) ◽  
pp. 840-845 ◽  
Author(s):  
Ryoji TAKAHASHI ◽  
Satoshi SATO ◽  
Toshiaki SODESAWA ◽  
Hideyo NISHIDA
Keyword(s):  
Diffusion Coefficient ◽  
Silica Gel ◽  
Nickel Nitrate ◽  
Si Content ◽  
Wet Silica Gel

Quadrupole splitting temperature dependence of high and low affinity deoxyhemoglobin encapsulated in wet silica gel

ICAME 2005 ◽  
2007 ◽  
pp. 279-283
Author(s):  
S. Croci ◽  
O. J. Babalola ◽  
S. Bettati ◽  
C. Valenti ◽  
I. Ortalli ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Quadrupole Splitting ◽  
Silica Gel ◽  
Wet Silica Gel

Study of the sorption and modelling of cesium by a Brazilian bentonite using PHREEQC

MRS Advances ◽  
2020 ◽  
Vol 5 (5-6) ◽  
pp. 245-252
Author(s):  
Clédola C. O. de Tello ◽  
Daisy M. M dos Santos ◽  
Thais B. Teixeira
Keyword(s):  
Diffusion Coefficient ◽  
Flow Cell ◽  
Batch Adsorption ◽  
Radionuclide Transport ◽  
One Dimensional ◽  
Cesium Sorption ◽  
Dimensional Flow ◽  
Retardation Coefficient ◽  
Cesium Radionuclide

ABSTRACTTo estimate the cesium sorption by the bentonite and to obtain the isotherms, some batch-adsorption experiments are being carried out, being the Kd (retardation coefficient) calculated from these isotherms. One-dimensional flow cell was constructed to measure the bentonite permeability regarding to a cesium solution, which results will be used to evaluate the diffusion coefficient – D. It will be used the PHREEQC software to model the transport of the cesium radionuclide through this bentonite with the Kd and D data. The modelling of radionuclide transport in the Brazilian materials will contribute to evaluate the efficiency of multi-barriers system of the national repository, because it is one of its safety criteria.

Wet Silica Gel; A Convenient Reagent for Deacetalization

Synthesis ◽  
2002 ◽  
Vol 1978 (01) ◽  
pp. 63-65 ◽  
Author(s):  
F. HUET ◽  
A. LECHEVALLIER ◽  
M. PELLET ◽  
J. CONIA
Keyword(s):  
Silica Gel ◽  
Wet Silica Gel

Synthesis and Reactivity of Boron-Functionalized C2B5-closo-Carboranes

2005 ◽  
Vol 60 (6) ◽  
pp. 597-602 ◽  
Author(s):  
Yong Nie ◽  
Avijit Goswami ◽  
Walter Siebert
Keyword(s):  
Silica Gel ◽  
Boron Atom ◽  
Room Temperature ◽  
Cross Coupling ◽  
Coupling Reactions ◽  
Cross Coupling Reactions ◽  
Wet Silica Gel

Treatment of the nido-2,3-Et2C2B4H42−dianion (1) with monoboron reagents led to closo-C2B5 carborane derivatives with functional substituents at the inserted apical boron atom. The reactions of 1 with BX3 (X = Br, I) afforded the corresponding closo-1-X-2,3-Et2C2B5H4 (2a,b), and with PhCΞCBcat (cat = O2C6H4) produced the alkynyl-substituted closo-1-CΞCPh-2,3-Et2C2B5H4 (2c). Pd-catalyzed Negishi-type cross-coupling reactions of 2b with RCΞCZnCl at room temperature gave the corresponding closo-1-CΞCR-2,3-Et2C2B5H4 derivatives 2d-f, R = SiMe3, Me, and tBu, respectively. Compound 3 with two C2B5 moieties linked via a C=C unit was obtained by a similar boron incorporation reaction with cis-Cl2B5(Et)C=C(Et)BCl2. The reactions of 2c,d with Co2(CO)8 afforded the dicobaltatetrahedrane-substituted carboranes 4c and d, in which the clusters C2B5 and Co2C2 are connected by a B-C bond. Compounds 4c,d lost the apical boron on wet silica gel or sand to give the nido-C2B4-C2Co2 compounds 5c,d. Formation of the carboranyl-substituted (η5- C5H5)Co(cyclobutadiene) complex 6c was observed in the reaction of 2c with (η5-C5H5)Co(C2H4)2. The composition of the products follows from NMR and MS data.

Nanosized Ni/SiO2 Catalyst Prepared by Homogeneous Precipitation in Wet Silica Gel

2001 ◽  
Vol 1 (2) ◽  
pp. 169-176 ◽  
Author(s):  
Ryoji Takahashi ◽  
Satoshi Sato ◽  
Toshiaki Sodesawa ◽  
Norifumi Nakamura ◽  
Satoshi Tomiyama ◽  
...  
Keyword(s):  
Silica Gel ◽  
Homogeneous Precipitation ◽  
Wet Silica Gel

Enhanced Diffusion Due to Swimming Bacteria

2003 ◽  
Author(s):  
Min Jun Kim ◽  
Kenneth S. Breuer
Keyword(s):  
Escherichia Coli ◽  
Molecular Weight ◽  
Diffusion Coefficient ◽  
Diffusion Process ◽  
Effective Diffusion Coefficient ◽  
Effective Diffusion ◽  
Flow Cell ◽  
Fickian Diffusion ◽  
Enhanced Diffusion ◽  
Swimming Bacteria

The effect of bacterial motion of the diffusion of a high molecular weight molecule is studied by observing the mixing of two streams of fluid in a micro-fabricated flow cell. The presence of Escherichia coli (E.coli) in one of the streams results in an increase in the effective diffusion coefficient of Dextran, which rises linearly with the concentration of bacteria from a baseline value of 2 × 10−7 cm2/s to 8 × 10−7 cm2/s at a concentration of 2.1 × 109 /ml (approximately 0.5 % by volume). The diffusion process is also observed to undergo a change from standard “Fickian” diffusion to a superdiffusive behavior in which the diffusion exponent rises from 0.5 to 0.55 as the concentration of bacteria rises from 0 to 2.1 × 109/ml.

Dispersion Control of Ni Particles in Porous Silica by Solution Exchange of Wet Silica Gel

1999 ◽  
Vol 28 (4) ◽  
pp. 305-306 ◽  
Author(s):  
Ryoji Takahashi ◽  
Satoshi Sato ◽  
Toshiaki Sodesawa ◽  
Masayuki Kato ◽  
Takaaki Yoshii
Keyword(s):  
Silica Gel ◽  
Porous Silica ◽  
Solution Exchange ◽  
Wet Silica Gel

Solid State Oxidation of Phenols to Quinones with Ammonium Persulfate/Wet SiO2

2005 ◽  
Vol 2005 (3) ◽  
pp. 160-161 ◽  
Author(s):  
Mohammed M. Hashemi ◽  
Zahed Karimi-Jaberi ◽  
Bagher Eftekhari-Sis
Keyword(s):  
Solid State ◽  
Silica Gel ◽  
Ammonium Persulfate ◽  
Solid State Method ◽  
Oxidation Of Phenols ◽  
State Method ◽  
Wet Silica Gel

A solid state method for the oxidation of phenols to quinones is described using ammonium persulfate/wet silica gel as oxidant

Estimation of diffusion coefficient of Ba++ ions in silica gel from periodic precipitation of BaMoO4

1982 ◽  
Vol 260 (5) ◽  
pp. 552-556 ◽  
Author(s):  
K. V. Kurien ◽  
V. K. Vaidyan ◽  
M. A. Ittyachen
Keyword(s):  
Diffusion Coefficient ◽  
Silica Gel ◽  
Periodic Precipitation
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