Research paperEffect of pretreatment of the electrokinetic properties of quartz
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Cited by (23)
Cryo-XPS – A new technique for the quantitative analysis of the structure of electric double layer at colloidal particles?
2020, Colloids and Surfaces A: Physicochemical and Engineering AspectsCitation Excerpt :An analogous coagulation kinetics analysis was made using data obtained by other researchers for basic, i.e. positively charged nonporous near-spherical colloids of hematite [19]. The analysis revealed facts that give the above rigid surface porous layer a new physico-chemical background having a potential to unify all colloidal manifestations of silica and, perhaps, all metal oxides: (i) a gel layer is predicted to exist even on the nonporous, relatively strongly charged surface of silica when pH of the solution is at least 6.0, i.e. far from pHPZC; this conforms with electrokinetic studies that indicate the gel layer on the surface of quartz and glass [20–23]. ( ii) this gel layer deswells since the shell thickness as a function of the electrolyte concentration decreases according to a simple theoretical scaling power law predicted for ion-penetrable and swellable polyelectrolyte gels.
Isoelectric points and points of zero charge of metal (hydr)oxides: 50 years after Parks' review
2016, Advances in Colloid and Interface ScienceColloidal stability-slip casting behavior relationship in slurry of mullite synthesized by the USP method
2012, Ceramics InternationalCitation Excerpt :Another plausible explanation for this divergence could be any contamination of the surface of mullite powders during production or pretreatments during ZP measurements. According to the relevant literature such a surface contamination may lead to vary the IEPs of mineral powders [41]. On the other hand, the zeta potential increases sharply with decrease in pH from zero mV at pH 8.9 to the about 50–60 mV at about pH 6 depending on the ionic strength of the medium due to dissociation of –MOH (where M symbolizes Si or Al) groups or proton (H+) adsorption on these groups, e.g.[–MOH + H+ → –MOH2+ ↔ –M+ + H2O]
Pressure solution - The importance of the electrochemical surface potentials
2011, Geochimica et Cosmochimica ActaCitation Excerpt :Specific binding, ion exchange and local dissolution at the surface take a much longer time compared with the diffusion of ions in the thin interfacial water film and are the effective rate-limiting steps. After the solution and/or surface conditions have changed, it may take as long as several hours for the surface charge/potential of quartz surfaces to reequilibrate (Kulkarni and Somasundaran, 1977). Therefore the pressure solution process is reaction-limited rather than diffusion-limited for the grain-grain contacts in our experiments (Greene et al., 2009).