Adsorption of surfactant-rich stickies onto mineral surfaces

Gribble, Christopher M.; Matthews, G. Peter; Gantenbein, Daniel; Turner, Andrew; Schoelkopf, Joachim; Gane, Patrick

doi:10.1016/j.jcis.2010.07.062

Cited by 11 publications

(10 citation statements)

References 28 publications

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“…In general, calcium carbonate is a system where surface effects are relatively small [34] and the low positive value is consistent with previous literature [35]. According to Gribble et al [36], the structure of talc consists of a magnesium hydroxide (Mg(OH)2) layer sandwiched between two sheets of silica (SiO2). These layers of talc are approximately 19 Å thick and they are held together by weak Van der Waal's forces.…”

Section: Methodssupporting

confidence: 87%

A Study of Cake Filtration Parameters Using the Constant Rate Process

2019

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The minerals calcium carbonate and talc were filtered under various conditions of filtrate flow rate and suspension concentration, using constant rate conditions with the aid of a peristaltic pump to draw the filtrate. Cake concentrations of between 0.41 and 0.53 v/v for calcium carbonate and 0.19 and 0.26 v/v for talc were recorded. The mean sizes of the two different minerals were very similar, but the average specific resistances obtained from the experiments were 5.9 × 1010 and 7.4 × 1011 m/kg for calcium carbonate and talc, respectively. These results do not agree with what would be predicted from an analytical equation for permeability, such as Kozeny-Carman. In addition, discontinuities were observed in all cases on the curves of filtrate volume with time for the initial stage of filtration. This behaviour is attributed to retarded packing compressibility (RPC) complicating the analysis of the filter medium resistance. RPC is an important component in determining the filter cake resistance and its functionality with cake forming pressure. It is found that there are additional effects that enhance the resistance to permeation in different cake materials, which is not recognised in the standard analytical approaches. These complexities can be related to shape, polydispersity, or agglomeration within the material sample and not to the experimental equipment or procedure. Furthermore, a complete and straightforward methodology is presented in this work for investigating the significance, or otherwise, of medium resistance on the later stages of the filtration.

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Section: Methodssupporting

confidence: 87%

A Study of Cake Filtration Parameters Using the Constant Rate Process

2019

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“…FCC is an amphoteric material typically showing electrochemical charge values of +22 and -17 µEq g −1 in a polyelectrolyte titration versus the anionic polyelectrolye poly(vinyl sulfate) potassium salt (KPVS) and the cationic polyelectrolyte poly(diallyldimethylammonium chloride) (Gantenbein et al, 2012). Previous research and zeta potential measurements onto FCC surfaces have yielded complex results, suggesting that there must be both cationic and anionic surface adsorption sites (Gribble et al, 2010). The material is not suitable for measurements of its cation exchange capacity (CEC).…”

Section: Surface Properties Of Substratesmentioning

confidence: 99%

“…2 Charlotte L. Levy et al MCCs (modified calcium carbonates) designed for the paper industry, particularly for coatings designed for ink-jet printing (Ridgway et al, 2004). MCCs are normally treated with <1 % polyacrylate dispersant to facilitate transport and application (Alm et al, 2010;Gribble et al, 2010), whereas FCCs are free of organic chemicals.…”

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confidence: 99%

Mechanism of adsorption of actives onto microporous functionalised calcium carbonate (FCC)

et al. 2017

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Microporous 'functionalised' calcium carbonate (FCC) has potential for use as a carrier for the controlled release of 'actives', by permeation and diffusion. We have investigated the nature of the FCC surface and the mechanism of adsorption of two typical actives, namely the anti-inflammatory drug aspirin and the flavour compound vanillin, from chloroform and aqueous ethanolic solutions. There is indirect evidence from the quantitative perturbation of Tóth isotherms that their adsorption is hindered by a stagnant diffusion layer of water trapped in the microporosity of the FCC. To complement previous studies of the surface of FCC, it was also tested with the cationic probe benzyltrimethylammonium bromide and the anionic probe sodium 2-naphthalenesulphonate. Experimental procedures were validated by comparison with adsorption onto ground calcium carbonate and high surface area talc.

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“…. With grinding, talc particles exhibit anisotropic surfaces: their cleavage surfaces parallel to (001) planes are hydrophobic, and their edge surfaces are hydrophilic .…”

Section: Introductionmentioning

confidence: 99%

Fat crystallization with talc particles is influenced by particle size, concentration, and cooling rate

Yoshikawa

Kida

Sato

2015

Euro J Lipid Sci & Tech

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We recently found that new types of additives including talc promoted the crystallization of monoacid saturated triacylglycerols (TAGs) in stable polymorphs. This study reports the effects of size and concentration of talc particles and cooling rate on the crystallization of trilauroylglycerol (LLL), tripalmitoylglycerol (PPP), and 1,3-dipalmitoyl-2-oleoyl glycerol (POP). Talc particles were mixed with molten TAGs, and the mixtures were then cooled at designated cooling rates. Polymorphic crystallization was observed by simultaneous use of X-ray diffractometry and differential scanning calorimetry and by polarized optical microscopy. The following results were obtained: (i) talc promoted the crystallization of LLL in stable polymorphs with decreasing particle size and increasing concentration; (ii) the promotional effects were influenced by the cooling rate; (iii) the same behavior was observed for PPP and POP; and (iv) hydrophobic modification of talc surfaces did not affect the promotional effects. These results indicate that talc particles having median sizes of less than 2.5 mm and concentrations exceeding 0.1 wt.% effectively promote fat crystallization, and that the promotional effects can be maximized by choosing proper cooling rates according to the target fats. Furthermore, we propose a model of the heterogeneous nucleation of TAG crystals taking account of the molecular adsorption on cleavage surfaces of talc.Practical applications Talc is widely approved as a food-grade ingredient, and the additive effects on various triacylglycerols widen its applicability to fat-based food and cosmetic materials.

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Adsorption of surfactant-rich stickies onto mineral surfaces

Cited by 11 publications

References 28 publications

A Study of Cake Filtration Parameters Using the Constant Rate Process

A Study of Cake Filtration Parameters Using the Constant Rate Process

Mechanism of adsorption of actives onto microporous functionalised calcium carbonate (FCC)

Fat crystallization with talc particles is influenced by particle size, concentration, and cooling rate

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