silica – TechConnect Briefs

A Novel Composite Nanostructured Calcium Silicate – Calcium Carbonate Material Produced from Geothermal Water and its Environmental Remediation and Industry Applications

Johnston J.H., Borrmann T., Victoria University of Wellington, NZ

We have developed a novel nanostructured calcium silicate – calcium carbonate composite material with excellent whiteness, chemical reactivity and physical absorbent properties, from the problematic silica contained in separated geothermal water. It is an environmentally [...]

Silver nanoparticle-coated silica hybrid particles as anti-biofouling agent on filter materials

Woo K., Ko Y-S, Park S.H., Lee J-H., Hwang J., Korea Insitute of Science and Technology, KR

Pathogenic bacteria and viruses cause health problems and occasionally, lead to pandemic. Thus, global demand for clean air and safe water is increasing. Filtering systems have been utilized to provide clean air and water. However, [...]

Novel Syntheses of Silica-Gold Core-Shell Particles

Cook M.J., Johnston J.H., Victoria University of Wellington, NZ

Methods for the synthesis of silica-gold core-shell particles presented in literature are not considered commercially viable due to various requirements: high reaction temperatures, the use of light-sensitive reagents, the use of ex-situ gold seeding adding [...]

Toxic Potential of Food-Relevant Nanoparticles in the Intestinal Epithelium

McCracken C., Zane A., Knight D., Dutta P., Waldman W.J., The Ohio State University, US

Oral exposure to nanoparticles incorporated in foods is increasingly common. However, the effects of these nanoparticles when ingested are still unknown. Thus, this investigation tested the hypothesis that nanoparticle toxicity is dependent on particle size, [...]

Thermal-managed sputtered micro machined gas chromatography columns for oilfield applications

Haudebourg R., Vial J., Thiébaut D., Sassiat P., Azzouz I., Danaie K., Bourlon B., Schlumberger, FR

Since the late 70s, new approaches have been proposed to replace conventional gas chromatograph apparatus by silicon based micro fabricated separation systems. The main challenge in miniaturized gas chromatography consists in the reproducible and collective [...]

Facile doping of silica nanoparticles with far-red cyanine dyes using the microemulsion method

Nooney R., McDonagh C., Biomedical Diagnostics Institute, IE

We prepared silica NPs doped with two far-red absorption cyanine dyes, FR670 and Cy5, using the microemulsion method. At these wavelengths there is less autofluorescence from biological molecules, solvents and substrates. The effects of changing [...]

Stability of Functionalized Magnetic Particles in a Physiologic Fluid

Baca Ramos K., Martínez Pérez C.A., Camacho Montes H., Olivas Armendáriz I., Martel A., García-Casillas P.E., Universidad Autonoma de Ciudad Juarez, MX

Magnetic materials are widely used in biomedical applications such as magnetic separation, magnetic resonance imaging, drug delivery and hyperthermia. In these applications the nanoparticles are functionalized in a core/shell type with polymeric materials which contains [...]

Influence of Silica Nanoparticles on the Thermal Transitions and Structure of PHBA-PET Nanocomposites

Miranda F., Acevedo A., University of Puerto Rico, PR

Composite films were produced by direct melt-blending of the polymer with up to 1.5 vol% loadings in a Thermo-Haake MiniLab2 twin-screw extruder. Thermal transitions were determined by differential scanning calorimetry and thermogravimetric analysis. Structure and [...]

The morphology and properties of silica nanoparticles synthesized by sol-gel reaction in elastomer matrix

Lipinska M., Zaborski M., Technical University of Lodz, PL

In our studies the influence of different dispersing agents on the synthesis and character of silica particles prepared by a sol-gel reaction was investigated. The silica with different surface morphology was synthesized from tetraethoxysilane (TEOS) [...]

Nanoscale Plasma Surface Modification of Powders

Roth C., Sonnenfeld A., von Rohr Ph.R., ETH Zürich, CH

New results of the plasma surface modification of fine-grained temperature sensitive particles are presented. Nanoparticles are deposited on larger substrate particles in a specially designed plasma chamber to improve the macroscopic powder properties as flowability [...]