silica – Page 2 – TechConnect Briefs

Fabrication and Characterization of pH-Responsive, Nanoparticle-Attached Porphyrins for Singlet Oxygen Production

Li W., Courtney S., Gandra N., Ellis E.D., Tiyyagura P.T., Gao R., Jackson State University, US

The goal of this work was to understand if singlet oxygen (1O2) production from an immobilized dye could be regulated directly on support media such as titania and silica. Two types of pH- responsive, nanoparticle-attached [...]

Control of solid surface properties by electron beam processing

Vasiljeva I.V., Mjakin S.V., Engineering Technology Center RADIANT, Ltd., RU

The effect of electron beam treatment upon various materials (oxides, sulfides, ceramics, polymers) is studied to clarify the general features of chemical reactions involving surface functional groups in correlation with the process parameters. The mechanisms [...]

Gas phase synthesis of silica nanoparticles in a hybrid microwave-plasma hot-wall reactor

Abdali A., Moritz B., Wiggers H., Schulz C., University of Duisburg-Essen, DE

A microwave plasma reactor was constructed for gas phase synthesis of silica nanoparticles from tetraethoxysilane and a subsequent hot-wall furnace was used to enable for different temperature/time profiles. This combination has enabled us to investigate [...]

Silica-coated Ag nanoparticles by scalable flame technology

Sotiriou G.A., Camenzind A., Pratsinis S.E., ETH Zürich, CH

Silica coated silver nanoparticles have been synthesized in one step, by using flame spray pyrolysis. By controlling the production parameters, different sizes and different coating thicknesses were achieved. The particles were characterized with TEM/STEM, EDX [...]

Hypertransparent Nanostructured Superhydrophobic Self-Cleaning Coatings on Glass Substrates

Jiang Y.D., Smalley Y., Paris H., Hunt A.T., nGimat Co., US

Self-cleaning surfaces have wide applications in architectural and automotive windows and solar panels, etc. The development of superhydrophobic surfaces was inspired by observation of lotus and other plant leaves. Many existing hydrophobic coatings either have [...]

Novel Approach for Preparation of Organic-Inorganic Hybrid Nanocomposites

Kim I-J., Kwon K.H., Cheil Industries Inc., KR

Novel organic-inorganic hybrid nanocomposites were synthesized through emulsion grafting polymerization in the presence of silica particles coated with methacryloxy(propyl)trimethoxysilane. Well-defined polymer chains were grown from the nanoparticle surfaces to yield individual particles composed of a [...]

Label-free and Real-Time Photonic Band-Gap Silica Nanosensor

Chyan J.Y., Yang S.C., Yeh J.A., National Tsing Hua University, TW

A photonic band-gap nanosensor based on porous silica is proposed in the study. The photonic band-gap silica nanosensor is easy to fabricate and simple to use. Its optical characteristics can be easily modulated by electrochemical [...]

Cytotoxicity of bare and PEGylated silica nanoparticles as potential gene-delivery vectors

Yagüe C., Saldaña L., Martin F., Arruebo M., Vilaboa N., Santamaria J., Universidad fe Zaragoza, ES

Silica and other inorganic carriers are one of the major groups used to transport drugs and bioactive molecules into cells. The others are viral carriers, organic cationic compounds and recombinant proteins. The use of mesoporous [...]

Interfacial Nanocomposite Characterization by Nanoparticle Debonding

Killgore J.P., Overney R.M., University of Washington, US

A novel nanoscale thermomechanical methodology is introduced involving resistively heated cantilevers, also referred to as heated tip AFM (HT-AFM), that provide direct access to the interfacial interaction strength between poly(trimethyl silyl propyne) (PTMSP) - silica [...]

Bimodal Macro- Mesoporous Silica Network

García Martínez J., Abellán G., Carrillo A.I., Linares N., University of Alicante, ES

Herein we described the synthesis of novel kind of silica materials prepared at room temperature in the presence of cationic surfactant, more specifically a quaternary amine (tallow tetraamine) to obtain silica-based materials with attractive properties, [...]