Results 161 to 170 of about 1,931 (184)

Silica/Ormosil SPIONs for Biomedical Applications

Current Nanoscience, 2013
In the present work, magnetic nanoparticles coated with silica or ORMOSIL are prepared in a two step process. In the first step, SPIONs with 6 nm average diameter are produced by a reduction-precipitation process conducted in air and in the second one, SPIONs were used as seeds for silica/ORMOSIL growth (below 30 nm), in situ by a modified Stöber sol-
M. C. Gonçalves, L. M. Fortes, A. R. Pimenta, J. C.G. Pereira, R. M. Almeida, M. D. Carvalho, L. P. Ferreira, M. M. Cruz, M. Godinho   +8 more
openaire   +1 more source

Hard ormosils prepared with ultrasonic irradiation

Journal of Sol-Gel Science and Technology, 1995
Organically modified silicates (ormosils) of high hardness were prepared by the reaction of TEOS (tetraethoxysilane) and PDMS (polydimethylsiloxane) aided by ultrasonic irradiation, which was chosen as the method for concentration of the solutions. The mechanisms leading to the hard ormosil formation were examined by liquid state 29Si NMR spectroscopy.
Takashi Iwamoto, John D. Mackenzie
openaire   +1 more source

Surfactant-Synthesized Ormosils with Application to Stone Restoration

Langmuir, 2010
A challenging objective in monumental stone restoration is to synthesize crack-free silica materials for application as consolidants. Hydrophobicity is also a valuable property for such products; it is important to prevent the penetration of water because water is the main vehicle by which the agents of decay enter the pore structure of the stone.
Maria J, Mosquera, Desireé M, de los Santos, Teresa, Rivas   +2 more
openaire   +2 more sources

Viscosity and structure of Ormosil solutions

Journal of Sol-gel Science and Technology, 1995
PDMS (polydimethylsiloxane)/TEOS (tetraethoxysilane) system Ormosils (organically modified silicates) can be rubbery or rigid, depending on their chemical composition and processing conditions. In order to determine the relationship between the viscosity and the structure of the Ormosil solutions through the sol-to-gel transition, five kinds of sols ...
Yasukazu Hoshino, John D. Mackenzie
openaire   +1 more source

Zirconia-ormosil films doped with PbS quantum dots

Journal of Non-Crystalline Solids, 1999
Abstract Zirconia-ormosil (organically modified silicates) films doped with different concentrations of PbS quantum dots were synthesized by sol–gel processing. A sol containing 3-(trimethoxysilil)propylmethacrylate as matrix precursor was mixed with a PbS colloidal doping sol.
MARTUCCI, ALESSANDRO, INNOCENZI P, FICK J, MACKENZIE JD   +3 more
openaire   +3 more sources

ORMOSIL Thin Films:  Tuning Mechanical Properties via a Nanochemistry Approach

Langmuir, 2006
The mechanical properties (hardness and elastic modulus) of organically modified silicate thin films can be finely tuned by varying the degree of alkylation and thus the fraction of six- and four-membered siloxane rings in the organosilica matrix. This opens the way to large tunability of parameters that are of crucial practical importance for films ...
Giovanni Palmisano, Eric Le Bourhis, Rosaria Ciriminna, Davide Tranchida, Mario Pagliaro   +4 more
openaire   +5 more sources

Ormosil-Nafion Composite Membranes for PEM Fuel Cells

ECS Transactions, 2006
Composite Nafion-based membranes were prepared and characterized, using an organosilane derivative (sulfonated diphenylsilanediol, SDPSD) as a filler. The formation of the composite substantially modified the properties of the Nafion matrix in terms of proton conductivity and thermal stability.
Mecheri B., D'Epifanio A., Traversa E., Licoccia S.   +3 more
openaire   +2 more sources

Producing ORMOSIL scaffolds by femtosecond laser polymerization

Applied Physics A, 2012
Structures with different geometries and sizes were built via direct femtosecond laser writing, starting from new organic/inorganic hybrid monomers based on hybrid methacrylate containing triethoxysilane, in addition to urethane and urea groups.
A. Matei, M. Zamfirescu, C. Radu, E. C. Buruiana, T. Buruiana, C. Mustaciosu, I. Petcu, M. Radu, M. Dinescu   +8 more
openaire   +1 more source

Integrating Ormosil films onto microstructured semiconductor substrates

Acta Materialia, 2014
Abstract A process of heterogeneously integrating organically modified siliceous aerogel (Ormosil) films onto microstructured substrates is presented. These substrates are architecturally designed to mimic photon detectors for remote sensing applications.
Matthew M. Ombaba, V.J. Logeeswaran, Adrian Ionescu, M. Saif Islam   +3 more
openaire   +1 more source

Microstructural and Mechanical Properties of Sono-Ormosils

Journal of Sol-Gel Science and Technology, 1998
Monolithic pieces and films of ormosils were obtained from ultrasound-assisted polycondensation of tetraethoxysilane (TEOS) and polydimethylsiloxane (PDMS). These sono-Ormosils were studied by means of high resolution Brillouin spectroscopy and their textures analyzed from adsorption isotherms.
E. Blanco, M. García-Hernández, R. Jiménez-Riobóo, R. Litrán, C. Prieto, M. Ramírez-del-Solar   +5 more
openaire   +1 more source