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Showing 1 to 20 of 25 for “"colloidal silica"”.
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Remediation of chromium contaminated soils with colloidal silica
The low-viscosity stabilizer, colloidal silica, is extensively used as a grouting material in the construction of grout curtains. It has low viscosity and is non-toxic, which is suitable for injection to stabilize fine-grained soils. It is also applied as a stabilizer in the in-situ treatment of …
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Aggregation Effects on the Rheological, Sedimentation, and Drying Behavior of Colloidal Silica Suspensions
… on the properties of aqueous and nonaqueous colloidal silica (SiO$\sb2)$ suspensions were investigated via a combination of theoretical modeling of interparticle interactions and experimental studies of their rheological (shear and compressive), sedimentation, and drying behavior. In aqueous …
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Passive Site Remediation for Mitigation of Liquefaction Risk
… formation slowly over a long period of time. Colloidal silica is a potential stabilizer for passive site remediation because at low concentrations it has a low viscosity and a wide range of controllable gel times of up to about 100 days. Loose Monterey No. 0/30 sand samples (Dr = 22%) treated …
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Colloidal interactions of thorium
… to determine the interactions of thorium with colloidal humic acid and colloidal silica under various aqueous conditions and organic carbon from Blue point, Muddy, and Rogers Springs. A colloidal distribution study was done in spiked Lake Tahoe and Mono Lake samples. Plutonium was studied as an …
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Development of a co-dispersion binder for the three-dimensional printing process to facilitate handling of ceramic casting shells in the green state
… layers is joined by selectively depositing a colloidal silica binder. Firing fuses the silica to the alumina, and subsequent processing removes the unbound powder from the casting cavity. In some instances, it may be advantageous to perform powder removal before firing. This requires higher …
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Development and Characterization of Controlled-Release Permanganate Gelfor Groundwater Remediation
… tests. Specific attention was devoted to use of colloidal silica within the CRP-G. Results of batch tests indicated that gelation times can be modified on the order of 5 min to over 10 dys; dilution by flowing water in the subsurface will be a consideration upon gel engineering. Results of column …
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Post-Closure Silica Transport in the Proposed High Level Radioactive Waste Repository at Yucca Mountain, Nevada
… and recondenses. This study examines how silica leaching might occur as a result of water-tuff interactions in Yucca Mountain after the emplacement of heat-producing nuclear waste canisters. A vertical thermal gradient experiment (VTGE) was designed and built in order to simulate the water …
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Mechanical testing of rapid-prototyping refractory ceramic print media
… manufactured (3D-printed) refractory alumina-silica ceramics were mechanically tested to ascertain their ultimate tensile strengths and observed to determine their dimensional consistency over the printing and post-printing process. The equipment used to perform tensile testing was designed …
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Fabrication of three-dimensional nanostructures for thermal study
… are discussed. Using self-assembly of colloidal silica particles as a template, various dielectrics of interest were filled to create nanostructured dielectric materials. First, sub-100 nanometer silica nanoparticles were synthesized and used to assemble a colloidal crystal template, …
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Use of Spatially Non-Uniform Electric Fields for Contact-Free Assembly of Three-Dimensional Structures from Colloidal Particles
… to the use of non-uniform electric field driven colloidal assembly are described. The first relates to experimental work using dielectrophoretic and electrohydrodynamic forces (electroosmosis) to shape three-dimensional colloidal structures. Formation and stabilization of close-packed …
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Adsorption and conformation change of short helical peptides on silica and aluminosilicate surfaces
… for the peptide Ac-DDDDAAYAARRRR-Am on amorphous colloidal silica nanoparticles were studied in detail. A greater amount of peptide was adsorbed at basic pH than at neutral pH. The was fit with Langmuir and Frumkin isotherms, and the free energy, enthalpy, and entropy of adsorption were …
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Proteomic Analysis of Plasma Membrane Proteins from Drug Susceptible and Drug Resistant Breast Cancer Cell Lines
… cells using a modified form of the cationic colloidal silica technique for plasma membrane isolation combined with analysis of these proteins using mass spectrometry. This method is then used in combination with metabolic stable isotope labeling to identify protein expression changes between …
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Surface Modification of Nanoparticles Using Controlled Radical Polymerization For Designed Interfaces
… (RAFT) to graft polymers from the surface of colloidal silica nanoparticles for incorporation in polymers to make composites. </p> <p>In the first part of this work, a new strategy based on Marcomolecular Design via Interchange of Xanthates (MADIX) polymerization was demonstrated to graft …
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Microemulsions formation, stability and their characterisations
… is also studied for different surfaces (i.e. silica, oxidised Fecralloy and catalyst coated Fecralloy) in the temperature range of 313-573K. Formaldehyde and acetaldehyde are formed as intermediate combustion products. Thus the microemulsion combustion can lead to new oxygenate products. The …
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Microparticle retention aid systems in mechanical pulp suspensions
… charge density polyacrylamides) and anionic colloidal silica in improving retention and drainage of thermomechanical pulp (TMP) suspensions loaded with precipitated calcium carbonate (PCC) is studied. While starch is primarily added as dry strength agent in PCC-filled TMP suspensions, it also …
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Synthesis and Surface Characterization of Silica-Polypeptide Composite Particles
… and sequential surface characterization of silica-polypeptide composite particles is described. Nearly monodisperse colloidal silica cores were obtained by the alkaline hydrolysis of tetraethyl orthosilicate (TEOS). The hydrodynamic radius can be easily controlled in the range of ƒî 20-140 …
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Implementing Electrochemical Impedance Spectroscopy for the In Situ Analysis Of Conducting-Membrane Fouling
… bovine serum albumin (BSA), humic acid, and colloidal silica in a supporting electrolyte of phosphate buffered saline (PBS) and potassium nitrate (KNO3), respectively. To better understand the spatial position and magnitude of fouling, EIS spectra were interpreted by fitting equivalent …
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Design and synthesis of microcapsules using microfluidics for autonomic self-healing in cementitious materials
… microcapsules were synthesised containing water, colloidal silica solution and sodium silicate solution as core material. In addition, an oil-in-oil-in-water (o/o/w) double emulsion was used to encapsulate mineral oil and emulsified healing agents. The formation of the core-shell structure with …
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The design, synthesis and characterization of chitosan-based interpenetrating polymer networks and thin film systems
… by combining chitosan with a tetra ethyl orthosilicate (TEOS) cross-linker to form an interpenetrating polymer network (IPN). In combination with a variety of ordered and disordered polymer and metal nanoparticles, the composites formed were studied with respect to their optical, mechanical and …
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Amine and Catalyst Stability Studies in the Catalyst-Aided CO2 Capture Process
… the addition of catalyst due to the presence of colloidal silica used in binding the catalyst . The absorber catalyst was further investigated using normal conditions of the absorber during capture . The results showed 41 and 30% increments in degradation rates of BEA and AMP, respectively, with …
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