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|Title:||Surface properties of calcium carbonate modified with silica by sol-gel method||Authors:||Pedrosa, Jorge
Lourenço, Ana F.
Ferreira, Paulo J.
|Keywords:||Precipitated calcium carbonate; Silica; Sol-gel method; Surface physical-chemical properties; IGC; XPS||Issue Date:||24-Feb-2016||Publisher:||Elsevier||Serial title, monograph or event:||Colloids and Surfaces A: Physicochemical and Engineering Aspects||Volume:||497||Abstract:||The physico chemical surface properties of precipitated calcium carbonate (PCC) modified with silica by sol-gel method were evaluated using inverse gas chromatography and compared to those of the original PCC. The modification of the surface of PCC crystals by a dense film of silica provided a slight decrease of the dispersive component of the surface energy and a significant decrease of the specific component of the work of adhesion with trichloromethane (a Lewis acidic probe). In addition, interactions measured with weak Lewis bases (1-alkenes) also revealed differences between PCC and PCC-silica samples. Differences in the surface properties (namely of the Lewis acid-base ones) of PCCs modified with distinct silica content (ca. 22 and 30 wt%), were also found, and were interpreted as being due to the different accessibility of silanol groups (Si-OH) on the materials surface: a higher prevalence of these acidic groups in the material with lower silica content increases the specific affinity to Lewis basic probes and decreases the affinity to Lewis acidic probe. X-ray photoelectron spectroscopy results confirmed the presence of silica on PCC, with a higher Si/Ca atomic ratio being found for the material with higher silica content.||URI:||http://hdl.handle.net/10316/33048||ISSN:||0927-7757||Other Identifiers:||10.1016/j.colsurfa.2016.02.020||DOI:||10.1016/j.colsurfa.2016.02.020||Rights:||openAccess|
|Appears in Collections:||FCTUC Eng.Química - Artigos em Revistas Internacionais|
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