Preparation and Characterization of Colloidal Silica Particles under Mild Conditions

2012 ◽  
Vol 89 (7) ◽  
pp. 940-942 ◽  
Author(s):  
Frances Neville ◽  
Azrinawati Mohd. Zin ◽  
Graeme J. Jameson ◽  
Erica J. Wanless
Keyword(s):  
Colloidal Silica ◽  
Silica Particles ◽  
Mild Conditions

Preparation and Characterization of CdS and ZnS Particles in Nanophase Reactors Provided by Binary Liquids Adsorbed at Colloidal Silica Particles

Langmuir ◽  
1996 ◽  
Vol 12 (15) ◽  
pp. 3709-3715 ◽  
Author(s):  
I. Dékány ◽  
L. Nagy ◽  
L. Túri ◽  
Z. Király ◽  
N. A. Kotov ◽  
...  
Keyword(s):  
Colloidal Silica ◽  
Silica Particles ◽  
Binary Liquids

Electrical Characterization of Slurry Particles and their Interactions with Wafer Surfaces

1999 ◽  
Vol 566 ◽  
Author(s):  
Jin-Goo Park ◽  
Sang-Ho Lee ◽  
Hyoung-Gyun Kim
Keyword(s):  
Particle Deposition ◽  
Colloidal Silica ◽  
Electrical Characterization ◽  
Dlvo Theory ◽  
Silica Particles ◽  
Zeta Potentials ◽  
Alumina Particles ◽  
Silica Alumina ◽  
Wafer Surfaces

The purpose of this study was to explore the interaction between slurry particles and wafer surfaces by the measurements of their zeta potentials. The zeta potentials of slurry particles such as fumed and colloidal silica, alumina, ceria and MnO2 and substrates such as silicon, TEOS, W, and Al have been measured by electrophoretic and electroosmosis method to evaluate the electrical properties of surfaces, respectively. The zeta potential of oxide and metal surfaces showed similar values to those of particles as a function of pH. The interaction energy between alumina and silica particles and TEOS, W and Al substrate were calculated based on DLVO theory. No deposition of silica particles on TEOS and the heavy deposition of alumina particles on metal substrates were observed in the particle deposition test. Experimental results were well agreed with the theoretical calculation.

Characterization of Colloidal Silica Particles by Ultra-Small-Angle X-ray Scattering

Langmuir ◽  
1996 ◽  
Vol 12 (10) ◽  
pp. 2608-2610 ◽  
Author(s):  
Toshiki Konishi ◽  
Eiji Yamahara ◽  
Norio Ise
Keyword(s):  
Small Angle ◽  
Colloidal Silica ◽  
Silica Particles ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

scholarly journals H/D Exchange Under Mild Conditions in Arenes and Unactivated Alkanes with C6D6 and D2O Using Rigid, Electron-rich Iridium PCP Pincer Complexes

2020 ◽  
Author(s):  
Joel D. Smith ◽  
George Durrant ◽  
Daniel Ess ◽  
Warren Piers
Keyword(s):  
Hydrogen Isotope ◽  
Isotope Exchange ◽  
Room Temperature ◽  
Pincer Complexes ◽  
Synthesis And Characterization ◽  
Hydrogen Isotope Exchange ◽  
Mild Conditions ◽  
Highly Active ◽  
Pcp Pincer

<div>The synthesis and characterization of an iridium polyhydride complex (Ir-H4)</div><div>supported by an electron-rich PCP framework is described. This complex readily loses molecular</div><div>hydrogen allowing for rapid room temperature hydrogen isotope exchange (HIE) at the hydridic</div><div>positions and the α-C-H site of the ligand with deuterated solvents such as benzene-d6, toluene-d8</div><div>and THF-d8. The removal of 1-2 equivalents of molecular H2 forms unsaturated iridium carbene</div><div>trihydride (Ir-H3) or monohydride (Ir-H) compounds that are able to create further unsaturation</div><div>by reversibly transferring a hydride to the ligand carbene carbon. These species are highly active</div><div>hydrogen isotope exchange (HIE) catalysts using C6D6 or D2O as deuterium sources for the</div><div>deuteration of a variety of substrates. By modifying conditions to influence the Ir-Hn speciation,</div><div>deuteration levels can range from near exhaustive to selective only for sterically accessible sites.</div><div>Preparative level deuterations of select substrates were performed allowing for procurement of</div><div>>95% deuterated compounds in excellent isolated yields; the catalyst can be regenerated by</div><div>treatment of residues with H2 and is still active for further reactions.</div>

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