Nano-structured silicas and silicates––new materials and their applications in paper

Johnston, James H.; McFarlane, Andrew J.; Borrmann, Thomas; Moraes, John

doi:10.1016/j.cap.2003.11.061

Cited by 33 publications

(28 citation statements)

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“…Nanostructured calcium silicate has been shown by Johnston et al [19,21,22] to be a material of high porosity, with nanometre-sized pores in an open framework arrangement, and exhibiting a "desert rose" type surface morphology. Three forms of NCS from the same batch, but with differing posttreatments, were analysed.…”

Section: Microstructurementioning

confidence: 98%

“…Nano-structured calcium silicate (NCS) is a highly porous material produced by controlled precipitation from geothermal fluids or commercial silicate solutions (sodium silicate). Its current application is as filler in newsprint and specialty papers as it has very high optical brightness and whiteness and is also beneficial in reducing print-through in newsprint [19][20][21][22]. The chemical and physical properties of NCS make this a candidate for the highly efficient treatment of aqueous waste containing phosphate and other ions [19,23].…”

Section: Introductionmentioning

confidence: 99%

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Calcium–phosphorus interactions at a nano-structured silicate surface

Southam

Lewis

McFarlane

et al. 2008

Journal of Colloid and Interface Science

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Nano-structured calcium silicate (NCS), a highly porous material synthesized by controlled precipitation from geothermal fluids or sodium silicate solution, was developed as filler for use in paper manufacture. NCS has been shown to chemisorb orthophosphate from an aqueous solution probably obeying a Freundlich isotherm with high selectivity compared to other common environmental anions. Microanalysis of the products of chemisorption indicated there was significant change from the porous and nano-structured morphology of pristine NCS to fibrous and crystalline morphologies and non-porous detritus. X-ray diffraction analysis of the crystalline products showed it to be brushite, CaHPO42H2O, while the largely X-ray amorphous component was a mixture of calcium phosphates. A two-step mechanism was proposed for the chemisorption of phosphate from an aqueous solution by NCS. The first step, which was highly dependent on pH, was thought to be desorption of hydroxide ions from the NCS surface. This was kinetically favoured at lower initial pH, where the predominant form of phosphate present was H2PO(-)4, and led to decreased phosphorus uptake with increasing pH. The second step was thought to be a continuing chemisorption process after stabilization of the pH-value. The formation of brushite as the primary chemisorption product was found to be consistent with the proposed mechanism.

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Section: Microstructurementioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Calcium–phosphorus interactions at a nano-structured silicate surface

Southam

Lewis

McFarlane

et al. 2008

Journal of Colloid and Interface Science

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“…Use of nanopigments with an appropriate binder in the coating formulation will help to fill the micro-voids and offer better barrier properties. Though the benefits of silica/talc based nanoparticles (Johnston et al, 2004) in the area of retention, dewatering, lowering water transmission rate and strength improvement of paper are explored recently, proper selection of nano-pigments is necessary to impart functional properties like anti-fungal and UV-protection. Since the first half of 2006, colloidal titania is exploited commercially by Nippon ® and Ahlstrom ® paper manufacturers in Japan to produce photocatalytic papers.…”

Section: Introductionmentioning

confidence: 99%

Functional behaviour of paper coated with zinc oxide–soluble starch nanocomposites

Prasad

Shaikh

Kathe

et al. 2010

Journal of Materials Processing Technology

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“…The most beneficial property of the silicates used in the chemical and pharmaceutical industries and agriculture is their adsorption capacity and the possibility of their modification (physical and chemical). They have been used in wastewater and mineral oils purification (Johnson et al 2004;Amin et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Ni(II) from model solutions using co-precipitated inorganic oxides

et al. 2013

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The aim of this work was to obtain an inorganic oxide system containing silica and magnesium oxide, and characterized by specific physicochemical properties, in particular well-defined adsorption parameters. The preparation process was carried out according to a co-precipitation method using solutions of sodium silicate and selected inorganic magnesium salt. The oxide system obtained (MgOÁSiO 2 ) was used as a support (adsorbent) of nickel(II) ions, whose precursors were model solutions of nitrates. The effectiveness of the adsorption process was evaluated using many different analytical techniques, including atomic absorption spectroscopy, energy dispersive X-ray spectroscopy and equivalent point titration. Moreover the stability of adsorbent/adsorbate bonding was estimated. The oxide systems-adsorbents-used in the process were also analyzed according to their physicochemical properties, especially changes in adsorption parameters. The last part of the study involved evaluation of the kinetics of the adsorption process depending on time and the pH of the reaction system.

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Nano-structured silicas and silicates––new materials and their applications in paper

Cited by 33 publications

References 0 publications

Calcium–phosphorus interactions at a nano-structured silicate surface

Calcium–phosphorus interactions at a nano-structured silicate surface

Functional behaviour of paper coated with zinc oxide–soluble starch nanocomposites

Adsorption of Ni(II) from model solutions using co-precipitated inorganic oxides

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