Results 171 to 180 of about 12,898 (223)
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Crystallization of TiO2 xerogel
Journal of Thermal Analysis and Calorimetry, 2020For utilization of TiO2 in advanced applications, TiO2 after thermal treatment has to be in crystalline phase of anatase, because it gives the desired (photocatalytic) properties to material. The work deals with the study of anatase crystallization in TiO2 xerogel (dried at 80 °C) which was prepared from sol in “titanium isopropoxide–isopropyl alcohol ...
Jana Pagáčová +6 more
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Superhydrophobic nitric oxide-releasing xerogels
Acta Biomaterialia, 2014Superhydrophobic nitric oxide (NO)-releasing xerogels were prepared by spray-coating a fluorinated silane/silica composite onto N-diazeniumdiolate NO donor-modified xerogels. The thickness of the superhydrophobic layer was used to extend NO release durations from 59 to 105h.
Wesley L. Storm +6 more
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Highly Absorbent Silk Fibroin Protein Xerogel
ACS Biomaterials Science & Engineering, 2021Highly absorbent polymers have a wide range of applications in biomaterials, agriculture, physiological products of daily uses, and others. Silk fibroin, as a natural biomaterial with excellent biocompatibility and tunable mechanical properties, shows good prospects in the field of biomedicine applications.
Cheng, Kang +5 more
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MRS Proceedings, 1992
ABSTRACTThe aqueous polycondensation of resorcinol with formaldehyde proceeds through a sol-gel transition and results in the formation of highly crosslinked, transparent gels. If the solvent is simply evaporated from the pores of these gels, large capillary forces are exerted and a collapsed structure known as a xerogel is formed. In order to preserve
Richard W. Pekala, Cynthia T. Alviso
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ABSTRACTThe aqueous polycondensation of resorcinol with formaldehyde proceeds through a sol-gel transition and results in the formation of highly crosslinked, transparent gels. If the solvent is simply evaporated from the pores of these gels, large capillary forces are exerted and a collapsed structure known as a xerogel is formed. In order to preserve
Richard W. Pekala, Cynthia T. Alviso
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Optically active doped xerogel
Journal of Non-Crystalline Solids, 1992Abstract Using the sol-gel process, organic dye molecules have been trapped and individually encaged in a solid xerogel matrix. These doping molecules were aligned by a focussed femtosecond laser pulse, thus creating a local birefringence. The molecule alignment is permanent. An optical memory matrix is thus experimentally achieved.
Canva, Michael +5 more
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Structure of Hybrid Colloid−Polymer Xerogels
Langmuir, 2004Crack-free monolithic gels were prepared from different mixtures of colloidal silica with a sol solution containing tetraethoxysilane, under powerful ultrasonic agitation (sonosol). Recently, information on the structure of these gels, inferred from N2 adsorption and mercury intrusion porosimetry, was presented.
Luis, Esquivias +3 more
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Low-frequency dynamics in silica xerogels
Journal of Physics: Condensed Matter, 1996Brillouin and Raman experiments have been performed in hydrogenated silica sol - gel and vitreous silica samples made by sol - gel processes (xerogels) and by the melting powder method. The aim of this work has been the study of the low-frequency dynamics of sol - gel systems in comparison with that of amorphous silica.
Fontana, Aldo +4 more
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OPTOGELs: optically active xerogels
SPIE Proceedings, 1992Using the sol-gel process, we synthesized zirconia/silica matrices doped with different organic dyes (rhodamine 640, ...). These samples were used to perform optical Kerr effect experiments with sequences of ultrashort light pulses (100 fs, 620 nm, 1 (mu) J focused on 50 micrometers diameter) to induce refractive index changes.
Michael Canva +5 more
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Silica xerogels as pharmaceutical drug carriers
Expert Opinion on Drug Delivery, 2009This review focuses on silica xerogels obtained by the sol-gel method and their application as drug delivery systems. SiO(2) xerogels are potential biomaterials to be used as matrix materials for the extended and controlled release of different kinds of biologically active agents administered by various routes.
David, Quintanar-Guerrero +3 more
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Carbon Xerogels for Effluent Treatment
Journal of Chemical & Engineering Data, 2020The adsorption process of carbonized xerogels in the form of porous microspheres or monoliths was found to be reversible.
Athulya Pillai +1 more
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