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Gun'ko VM, Turov VV, Zarko VI, et al. Interfacial phenomena at a surface of individual and complex fumed nanooxides. Adv Colloid Interface Sci. 2016;235:108-189doi: 10.1016/j.cis.2016.06.003.
Gun'ko, V. M., Turov, V. V., Zarko, V. I., Goncharuk, O. V., Pakhlov, E. M., Skubiszewska-Zięba, J., & Blitz, J. P. (2016). Interfacial phenomena at a surface of individual and complex fumed nanooxides. Advances in colloid and interface science, 235108-189. https://doi.org/10.1016/j.cis.2016.06.003
Gun'ko, V M, et al. "Interfacial phenomena at a surface of individual and complex fumed nanooxides." Advances in colloid and interface science vol. 235 (2016): 108-189. doi: https://doi.org/10.1016/j.cis.2016.06.003
Gun'ko VM, Turov VV, Zarko VI, Goncharuk OV, Pakhlov EM, Skubiszewska-Zięba J, Blitz JP. Interfacial phenomena at a surface of individual and complex fumed nanooxides. Adv Colloid Interface Sci. 2016 Sep;235:108-189. doi: 10.1016/j.cis.2016.06.003. Epub 2016 Jun 11. PMID: 27344189.
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Adv Colloid Interface Sci. 2016 Sep;235:108-189. doi: 10.1016/j.cis.2016.06.003. Epub 2016 Jun 11.

Interfacial phenomena at a surface of individual and complex fumed nanooxides.

Advances in colloid and interface science

V M Gun'ko, V V Turov, V I Zarko, O V Goncharuk, E M Pakhlov, J Skubiszewska-Zięba, J P Blitz

Affiliations

  1. Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kyiv, Ukraine. Electronic address: [email protected].
  2. Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kyiv, Ukraine.
  3. Faculty of Chemistry, Maria Curie-Sk?odowska University, 20-031 Lublin, Poland.
  4. Eastern Illinois University, Department of Chemistry, Charleston, IL 61920, USA.

PMID: 27344189 DOI: 10.1016/j.cis.2016.06.003

Abstract

Investigations of interfacial and temperature behaviors of nonpolar and polar adsorbates interacting with individual and complex fumed metal or metalloid oxides (FMO), initial and subjected to various treatments or chemical functionalization and compared to such porous adsorbents as silica gels, precipitated silica, mesoporous ordered silicas, filled polymeric composites, were analyzed. Complex nanooxides include core-shell nanoparticles, CSNP (50-200nm in size) with titania or alumina cores and silica or alumina shells in contrast to simple and smaller nanoparticles of individual FMO. CSNP could be destroyed under high-pressure cryogelation (HPCG) or mechanochemical activation (MCA). These treatments affect the structure of aggregates of nanoparticles and agglomerates of aggregates, resulting in their becoming more compacted. The analysis shows that complex FMO could be more sensitive to external actions than simple nanooxides such as fumed silica. Any treatment of 'soft' FMO affects the interfacial and temperature behaviors of polar and nonpolar adsorbates. Rearrangement of secondary particles and surface functionalization affects the freezing-melting point depression of adsorbates. For some adsorbates, open hysteresis loops became readily apparent in adsorption-desorption isotherms. Clustering of adsorbates bound in textural pores in aggregates of nanoparticles (i.e., voids between nanoparticles in secondary structures) causes reduced changes in enthalpy during phase transitions (freezing, fusion, evaporation). Freezing point depression and melting point elevation cause significant hysteresis freezing-melting effects for adsorbates bound to FMO in the textural pores. Relaxation phenomena for both low- and high-molecular weight adsorbates or filled polymeric composites are affected by the morphology of primary particles, structural organization of secondary particles of differently treated or functionalized FMO, content of adsorbates, co-adsorption order, and temperature.

Copyright © 2016 Elsevier B.V. All rights reserved.

Keywords: Adsorption; Complex nanooxides; Confined space effect; Evaporation; Interfacial phenomena; Nanosilica

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