Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 497, Issue -, Pages 1-7Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2016.02.020
Keywords
Precipitated calcium carbonate; Silica; Sol-gel method; Surface physical-chemical properties; IGC; XPS
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Funding
- FCT-Fundacao para a Ciencia e Tecnologia [PTDC/EQU-EQU/120578/2010]
- FEDER-Fundo Europeu de Desenvolvimento Regional, through the program COMPETE (Programa Operacional Fatores de Competitividade) [FCOMP-01-0124-FEDER-020483]
- Fundação para a Ciência e a Tecnologia [PTDC/EQU-EQU/120578/2010] Funding Source: FCT
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The physicochemical 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. (C) 2016 Elsevier B.V. All rights reserved.
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