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dc.contributor.CRUESPUniversidade Estadual de Campinaspt_BR
dc.typeArtigo de periódicopt_BR
dc.titleSize effects on the microchemistry and plasticity of Stober silica particles: A study using EFTEM, FESEM, and AFM-SEPM microscopiespt_BR
dc.contributor.authorCosta, CARpt_BR
dc.contributor.authorLeite, CAPpt_BR
dc.contributor.authorde Souza, EFpt_BR
dc.contributor.authorGalembeck, Fpt_BR
unicamp.authorUniv Estadual Campinas, UNICAMP, Inst Quim, BR-13083970 Campinas, SP, Brazil Pontificia Univ Catolica Campinas, Inst Ciencias Biol & Quim, BR-13020904 Campinas, SP, Brazilpt_BR
dc.subject.wosLight-scatteringpt_BR
dc.subject.wosSedimentationpt_BR
dc.subject.wosDispersionspt_BR
dc.description.abstractTwo different samples of monodisperse Stober silica particles were examined using three different microscopies: energy-filtered analytical transmission electron microscopy (EFTEM), high-resolution field-emission scanning electron microscopy(FESEM), and scanning probe microscopy, in the noncontact atomic force (AFM) and scanning electric potential microscopy (SEPM) modes. Upon drying the silica dispersions, the larger (ca. 141 nm) particles were only partially deformed by capillary adhesion, whereas the smaller particles (ca. 36 nm) were strongly deformed and closely packed into dense films of a low porosity, which is evidence of their larger plasticity, or superplasticity. Electric potential distribution maps obtained by SEPM showed a significant interparticle as well as intraparticle contrast, especially in the case of the smaller particles. Examination by electron backscattering also revealed a larger contrast among the smaller particles, thus evidencing a nonuniformity of chemical composition. The results are interpreted considering the changes in the synthetic medium and other aspects of the particle growth mechanism, and they point toward the possibility of exploiting the plasticity of the nanosized silica particles in the making of silica monoliths.pt
dc.relation.ispartofLangmuirpt_BR
dc.relation.ispartofabbreviationLangmuirpt_BR
dc.publisher.cityWashingtonpt_BR
dc.publisher.countryEUApt_BR
dc.publisherAmer Chemical Socpt_BR
dc.date.issued2001pt_BR
dc.date.monthofcirculation39814pt_BR
dc.identifier.citationLangmuir. Amer Chemical Soc, v. 17, n. 1, n. 189, n. 194, 2001.pt_BR
dc.language.isoenpt_BR
dc.description.volume17pt_BR
dc.description.issuenumber1pt_BR
dc.description.firstpage189pt_BR
dc.description.lastpage194pt_BR
dc.rightsfechadopt_BR
dc.sourceWeb of Sciencept_BR
dc.identifier.issn0743-7463pt_BR
dc.identifier.wosidWOS:000166269800027pt_BR
dc.identifier.doi10.1021/la000408+pt_BR
dc.date.available2014-11-18T08:16:57Z
dc.date.available2015-11-26T17:48:06Z-
dc.date.accessioned2014-11-18T08:16:57Z
dc.date.accessioned2015-11-26T17:48:06Z-
dc.description.provenanceMade available in DSpace on 2014-11-18T08:16:57Z (GMT). No. of bitstreams: 1 WOS000166269800027.pdf: 445567 bytes, checksum: cd1fe047955b8d46cbc33d864233b908 (MD5) Previous issue date: 2001en
dc.description.provenanceMade available in DSpace on 2015-11-26T17:48:06Z (GMT). No. of bitstreams: 2 WOS000166269800027.pdf: 445567 bytes, checksum: cd1fe047955b8d46cbc33d864233b908 (MD5) WOS000166269800027.pdf.txt: 25681 bytes, checksum: 922c315e0c4f90067ffab98ed96f5642 (MD5) Previous issue date: 2001en
dc.identifier.urihttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/74317pt_BR
dc.identifier.urihttp://www.repositorio.unicamp.br/handle/REPOSIP/74317
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/74317-
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