Modified calcium carbonate coatings with rapid absorption and extensive liquid uptake capacity

Ridgway, Cathy J.; Gane, Patrick; Schoelkopf, Joachim

doi:10.1016/j.colsurfa.2003.12.030

Cited by 44 publications

(29 citation statements)

References 18 publications

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“…FCCs are produced by etching calcium carbonate particles and re-precipitating a modified surface structure with in-situ or externally supplied CO 2 in the form of carbonic acid (Ridgway et al, 2004). To facilitate the in-situ production of CO 2 , acids such as phosphoric acid (H 3 PO 4 ) can be used.…”

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

et al. 2017

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“…Coating structures are specific examples of network structures where high pressure capillarity in the finest pores operates in the limit as t → 0 is countered by the inertial forces associated with accelerating the larger mass of liquid attempting to enter a large pore on these short timescales, and subsequent access to the remaining network is controlled by the permeability of the structure Schoelkopf et al 2000a, b;Gane et al 2004;Schoelkopf et al 2001Schoelkopf et al , 2002Schoelkopf et al , 2003aSchoelkopf et al , b, c, 2004bRidgway et al 2004Ridgway et al , 2006bGane 2006;Schoelkopf and Gane 2004). The longer time, and hence larger mass, component is thus permeability controlled, and so the absorption rate into such networks is recorded generally as following the typical square root of time dependence, although the internal mechanisms within the structure at the wetting front are not defined by equilibrium Poiseuille flow but rather by inertial plug flow phenomena (Schoelkopf et al 2000b;.…”

Section: Liquid Uptake Into Coating Structuresmentioning

confidence: 96%

Relating Liquid Location as a Function of Contact Time Within a Porous Coating Structure to Optical Reflectance

Gane

Koivunen

2010

Transp Porous Med

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Refractive index differences between a first and a second fluid can be utilised to obtain information about the location and amount of the fluids in a porous medium in the case where the light absorption coefficient of the skeletal material is small and the light scattering coefficient high using optical measurement methods. An example of such a medium is an air-filled paper coating, and the fluid that of a printing ink liquid phase absorbing into the coating during printing. We examined capillary absorption of mineral oil, used in offset printing ink, into model coatings compressed from dispersed mineral pigments with a range of latex binder levels, and established a porosity-normalised relationship for light reflectance change as a function of absorbed mass of the liquid established at a given time after initial contact with the liquid. The results suggest a significant change in reflectance due to the absorption, and progressive absorption behaviour of the liquid in the coatings can be monitored by the change in reflectance following a newly established relationship derived from the observational data. The findings support the concept of a preferred pathway flow for the wetting front, defined by differential pore size and connectivity, and a longer time saturation front flow lagging behind the wetting front, which theoretically at the limit of infinite time coincides with the wetting front, the time constant of the approach being related to the permeability of the porous network.

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“…Pore-Cor 6 provides a void network simulation, and has been previously used to model a range of materials such as soil, sandstone, catalysts, and paper coating [12][13][14][15]. It represents the void structure of a porous medium as a series of identical interconnected unit cells with periodic boundary conditions.…”

Section: Pore-cormentioning

confidence: 99%

Modelling the shrinkage in pigmented coatings during drying: A stick–slip mechanism

Laudone

Matthews

Gane

2006

Journal of Colloid and Interface Science

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Modified calcium carbonate coatings with rapid absorption and extensive liquid uptake capacity

Cited by 44 publications

References 18 publications

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

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

Relating Liquid Location as a Function of Contact Time Within a Porous Coating Structure to Optical Reflectance

Modelling the shrinkage in pigmented coatings during drying: A stick–slip mechanism

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