Kinetics of Formation of Monodisperse Colloidal Silica Particles through the Hydrolysis and Condensation of Tetraethylorthosilicate

1996 ◽  
Vol 35 (12) ◽  
pp. 4487-4493 ◽  
Author(s):  
Sheng-Li Chen ◽  
Peng Dong ◽  
Guang-Hua Yang ◽  
Jiu-Jin Yang
Keyword(s):  
Colloidal Silica ◽  
Silica Particles ◽  
Hydrolysis And Condensation ◽  
Kinetics Of Formation ◽  
Kinetics Of ◽  
Monodisperse Colloidal Silica

Modelling of aggregation kinetics of colloidal silica particles

1990 ◽  
Vol 121 (1-3) ◽  
pp. 56-60 ◽  
Author(s):  
C.M. Bagnall ◽  
L.G. Howarth ◽  
P.F. James
Keyword(s):  
Colloidal Silica ◽  
Silica Particles ◽  
Aggregation Kinetics ◽  
Kinetics Of

Absolute Light Scattering Calibration of the Stopped-Flow Spectrophotometer with Application to the Kinetics of Formation of Monodispersed Colloidal Hematite

1987 ◽  
Vol 41 (3) ◽  
pp. 402-407 ◽  
Author(s):  
Wan Peter Hsu ◽  
Ramesh C. Patel ◽  
Egon Matijevic
Keyword(s):  
Colloidal Silica ◽  
Temperature Jump ◽  
Scattered Light ◽  
Calibration Method ◽  
Stopped Flow ◽  
Flow Temperature ◽  
Hydrous Oxides ◽  
Solid Iron ◽  
Kinetics Of Formation ◽  
Kinetics Of

A calibration method based on absolute intensities of scattered light from colloidal silica was developed to standardize the stopped-flow temperature jump spectrophotometer (SFTJ). The need for such calibration was exemplified by the study of the temperature effect on the Rayleigh ratio changes during the formation of solid iron (hydrous) oxides.

The transient settling of stable and flocculated dispersions

1990 ◽  
Vol 221 ◽  
pp. 613-639 ◽  
Author(s):  
FranÇois M. Auzerais ◽  
R. Jackson ◽  
W. B. Russel ◽  
W. F. Murphy
Keyword(s):  
Colloidal Silica ◽  
Hard Spheres ◽  
Density Measurement ◽  
Ct Scanner ◽  
Experimental Systems ◽  
Absolute Density ◽  
Medical Computer ◽  
Kinetics Of ◽  
Monodisperse Colloidal Silica ◽  
Flux Curve

An experimental investigation of the sedimentation of monodisperse colloidal silica spheres with grafted octadecyl chains with three different interaction potentials is presented. Small particles (0.27 μm) behaved as hard spheres in cyclohexane, but larger ones (0.60 and 0.94 μm) are weakly flocculated by van der Waals attractions. The smallest particles (0.08 μm) in hexadecane are strongly flocculated by attractions between the octadecyl layers. A medical computer tomography (CT) scanner provided an accurate and absolute density measurement without disrupting the process. For the hard spheres and the weakly flocculated systems, the kinetics of sedimentation for the dispersed phase could readily be predicted utilizing the flux curve. For flocculated networks, we found a power-law relationship between compressive yield stresses and solids fractions comparable with other experimental systems.

Preparation and Processing of Monodisperse Colloidal Silica-Cadmium sulfide nanocomposites

1994 ◽  
Vol 346 ◽  
Author(s):  
Song-Yuan Chang ◽  
Lei Liu ◽  
Sanford A. Asher
Keyword(s):  
Cadmium Sulfide ◽  
Surface Area ◽  
Colloidal Silica ◽  
High Surface ◽  
High Surface Area ◽  
Reaction Medium ◽  
Silica Particles ◽  
Linear Optics ◽  
Silica Colloids ◽  
Monodisperse Colloidal Silica

ABSTRACTA novel synthetic methodology has been developed for preparing monodisperse colloidal silica-cadmium sulfide nanocomposite spheres in the 50 – 300 nm size regime. This methodology uses water-in-oil microemulsions as the reaction medium. Monosize silica colloids are first produced by the controlled hydrolysis of tetraethyl orthosilicate in the micro water droplets of the microemulsion. Cadmium sulfide quantum dots are incorporated into the silica colloids during synthesis by the introductions of Cd2+ and S2- microemulsions. Various morphologies of the nanocomposite are fabricated by controlling the heterogeneous coagulation of CdS and SiO2. Unique high surface area silica particles can be prepared when nitric acid etches out the CdS and leaves behind topologically defined voids. The CdS nanocomposites are new materials useful for non-linear optics, while the high surface area silica particles should have novel applications in areas such as catalysis.

Synthesis of Fluorescent, Monodisperse, Colloidal Silica Particles

1993 ◽  
Vol 159 (1) ◽  
pp. 150-157 ◽  
Author(s):  
René Nyffenegger ◽  
Christian Quellet ◽  
Jaroslav Ricka
Keyword(s):  
Colloidal Silica ◽  
Silica Particles ◽  
Monodisperse Colloidal Silica
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