Results 121 to 130 of about 391 (161)

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
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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

Thermal Stability Enhancement Of Rubbery Ormosils

MRS Proceedings, 1994
ABSTRACTThermal stability of a novel rubbery ORMOSIL of condensed tetraethoxysilane (TEOS) and polydimethylsiloxane (PDMS) was investigated along with methods by which to improve this stability. Based upon literature review of siloxane systems, modifications of the base ORMOSIL ...
S. J. Kramer, J. D. Mackenzie
openaire   +1 more source

Characteristics of dye-doped ormosil lasers

SPIE Proceedings, 1994
New hybrid organic-inorganic materials synthesized at room temperature and doped with laser dyes have been tested for laser action. The new ormosil material has excellent optical properties and is an effective host for many organic molecules.
Mark D. Rahn, Terence A. King, Carol A. Capozzi, Angela B. Seddon   +3 more
openaire   +1 more source

Structures, Properties and Potential Applications of Ormosils

Journal of Sol-Gel Science and Technology, 1998
Ormosils are organic-inorganic hybrid solids in which the organic component may be chemically bonded to a silica matrix. Somewhat similar to inorganic silicate glasses, the structure of the silica network can be modified by the presence of organic groups.
John D. Mackenzie, Eric P. Bescher
openaire   +1 more source

The Role of Fe in the Thermal Stabilization of Ormosils

Journal of Sol-Gel Science and Technology, 2003
The thermal stability of organically modified silicates (Ormosils) is limited by that of their organic constituent. In the case of the polydimethylsiloxane (PDMS)-silica hybrids, degradation of the PDMS begins around 250°C, which restricts their range of applications.
Eric Bescher, Y. Hoshino, Yuka Nishizawa, Kristen Cooley, John D. Mackenzie   +4 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

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

Ormosil Nanocomposite Materials as Modifiers for Acrylic Coating Systems

Journal of Nanoscience and Nanotechnology, 2006
Organically modified silica (ormosil) particles were prepared using hydrolytic sol-gel methods and the miniemulsion polymerisation approach. Methyl-, ethyl-, and phenylsilsesquioxane nanoparticles with diameters in the range 50-180 nm were obtained using the modified Stöber method with an aqueous sodium silicate solution used as a seed for further ...
Arkhireeva, A, Hay, JN
openaire   +4 more sources

Thin ORMOSIL Films with Different Organics

Journal of Sol-Gel Science and Technology, 1998
Structural, optical and electrical properties of silicate films modified by structure fragments containing different organic groups were studied. The ORMOSILs were produced by a cohydrolysis of tetraethoxysilane with different types of alkyl (aryl) substituted alkoxysilanes.
K.A. Vorotilov, V.A. Vasiljev, M.V. Sobolevsky, A.S. Sigov   +3 more
openaire   +1 more source