Polydimethylsiloxane at the interfaces of fumed silica and zirconia/fumed silica

Gun'ko, VM; Borysenko, MV; Pissis, P; Spanoudaki, A; Shinyashiki, N; Sulim, IY; Kulik, TV; Palyanytsya, BB

dc.contributor.author	Gun'ko, VM	en
dc.contributor.author	Borysenko, MV	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Spanoudaki, A	en
dc.contributor.author	Shinyashiki, N	en
dc.contributor.author	Sulim, IY	en
dc.contributor.author	Kulik, TV	en
dc.contributor.author	Palyanytsya, BB	en
dc.date.accessioned	2014-03-01T01:26:55Z
dc.date.available	2014-03-01T01:26:55Z
dc.date.issued	2007	en
dc.identifier.issn	0169-4332	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18283
dc.subject	Adsorption properties	en
dc.subject	DRS	en
dc.subject	Infrared spectra	en
dc.subject	Interfacial relaxation phenomena	en
dc.subject	PDMS/fumed silica	en
dc.subject	PDMS/zirconia/fumed silica	en
dc.subject	Structural characteristics	en
dc.subject	Thermogravimetry	en
dc.subject	TPD MS	en
dc.subject	Zirconia/fumed silica	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Materials Science, Coatings & Films	en
dc.subject.classification	Physics, Applied	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	Adsorption	en
dc.subject.other	Dielectric relaxation	en
dc.subject.other	Hydrophobicity	en
dc.subject.other	Infrared spectroscopy	en
dc.subject.other	Interfaces (materials)	en
dc.subject.other	Silica	en
dc.subject.other	Temperature programmed desorption	en
dc.subject.other	Zirconia	en
dc.subject.other	Disperse oxides	en
dc.subject.other	Grafted zirconia	en
dc.subject.other	Interfacial relaxation	en
dc.subject.other	Treatment temperature	en
dc.subject.other	Polydimethylsiloxane	en
dc.title	Polydimethylsiloxane at the interfaces of fumed silica and zirconia/fumed silica	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.apsusc.2007.02.185	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.apsusc.2007.02.185	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	Polydimethylsiloxane (PDMS)/fumed silica A-300 and PDMS/ZrO2/A-300 were studied using adsorption, thermogravimetry, temperature-programmed desorption (TPD) mass-spectrometry, infrared spectroscopy, XRD, and broadband dielectric relaxation spectroscopy. ZrO2 was synthesized on fumed silica with zirconium acetylacetonate in CCl4 at 350 K for 1 h and calcinated at 773 K for 1 h (1-4 reaction cycles). PDMS (5-40 wt.%) was adsorbed onto silica and zirconia/silica from hexane solution and then dried. Grafted zirconia changes the chemistry of the surface (because of its catalytic capability) and the topology of secondary particles (because of occupation of voids in aggregates of primary silica particles by zirconia nanoparticles) responsible for the textural porosity of the powders. Therefore, many properties (such as structural characteristics of the composites, reactions on heating in air and vacuum, interfacial relaxation phenomena, hydrophobicity as a function of treatment temperature, etc.) of PDMS/zirconia/silica strongly differ from those of PDMS/A-300. Broadening of the alpha-relaxation of PDMS at the interfaces of disperse oxides suggests both weakening of the PDMS-PDMS interaction and strengthening of the PDMS-oxide interaction. (c) 2007 Elsevier B. V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Applied Surface Science	en
dc.identifier.doi	10.1016/j.apsusc.2007.02.185	en
dc.identifier.isi	ISI:000247867700028	en
dc.identifier.volume	253	en
dc.identifier.issue	17	en
dc.identifier.spage	7143	en
dc.identifier.epage	7156	en