Ion Exchange on Muscovite Mica with Ultrahigh Specific Surface Area

Shelden, Ronald A.; Caseri, Walter; Suter, Ulrich W.

doi:10.1006/jcis.1993.1192

Cited by 40 publications

(55 citation statements)

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“…16 The adsorption of MB onto the external surface of the vermiculite is more likely to be in the dimer form at the concentrations used for the adsorption experiments. 6,22 This suggests that the MB exchanges with the Li in the interlayer spacing and is probably adsorbed as a monomer and the external surface exposed by the delamination MB will more probably be adsorbed in the form the dimer. Therefore the amount of MB adsorbed should be a good indication of the efficiency of the delamination step.…”

Section: Delamination and Water Affinity Of Filmsmentioning

confidence: 99%

“…18 In order to estimate the surface area of these delaminated vermiculites a knowledge of the internal and external surface is therefore necessary. The use of nitrogen adsorption to estimate the external surface could be a possibility but Shelden et al 6 have shown that this is viable only for low surface area micas and is not really applicable to our delaminated vermiculites. Therefore estimates of internal and external surfaces and specific surface areas cannot be estimated unambiguously.…”

Section: Delamination and Water Affinity Of Filmsmentioning

confidence: 99%

“…5 The production of flexible mica films is rendered more difficult because they do not swell and delamination by grinding is difficult although some high surface area micas have become available more recently. 6 The vermiculite films a) Current address: Department of Chemical and Fuels Engineering, University of Utah, 3290 Merrill Engineering, Salt Lake City, Utah 84112.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and properties of potassium-vermiculite films

et al. 1998

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Flexible films of vermiculite have been prepared from aqueous suspensions after swelling by cation exchange and mechanical delamination. Two different swelling cations, lithium and butylammonium, have been investigated. The degree of swelling and delamination during the suspension preparation was characterized by the percentage of water reabsorbed by dried clays and the adsorption of methylene blue. The vermiculite saturated with lithium ions is more easily delaminated but contains more water than those saturated with butylammonium. Good quality coherent flexible films could be prepared from both the lithium and butylammonium exchanged vermiculites but the high percentage of water found in the films has a detrimental effect on their dielectric properties. To reduce the amount of water in the exchanged vermiculites a second ion exchange with potassium, a less hydratable cation, was investigated. Films prepared after exchange with potassium showed significant improvements in their dielectric properties, with a dielectric constant e around 10 and a dissipation factor tan d around 0.06 at 25 ± C and a frequency of 1 kHz.

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Section: Delamination and Water Affinity Of Filmsmentioning

confidence: 99%

Section: Delamination and Water Affinity Of Filmsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation and properties of potassium-vermiculite films

et al. 1998

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“…Surfactant adsorption of long-chain alkylammonium salts, such as cetyltrimethylammonium bromide (CTAB) [23,24] and N-dodecylpyridinium chloride (NDP) [21] are known to hydrophobize negatively charged minerals. Exchange with bivalent cations has been used to mediate binding of DNA for SPM studies [25].…”

Section: Introductionmentioning

confidence: 99%

“…As an alternative to the attachment of a two-dimensional siloxane network onto the mica surface, efforts have been made to alter the surface chemistry by exchanging the surface cations (mostly potassium) at the basal (001) cleavage plane with other inorganic and organic ions [21,22]. Surfactant adsorption of long-chain alkylammonium salts, such as cetyltrimethylammonium bromide (CTAB) [23,24] and N-dodecylpyridinium chloride (NDP) [21] are known to hydrophobize negatively charged minerals.…”

Section: Introductionmentioning

confidence: 99%

Reversible, site‐specific immobilization of polyarginine‐tagged fusion proteins on mica surfaces

1997

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A large variety of genes is expressed as fusion proteins for the purpose of characterization and purification in molecular biology. We have used this strategy to append polyarginine peptides in order to achieve specific binding of the Arg-tag to atomically flat, negatively charged mica surfaces. We show that the model protein, hexaarginine-tagged green fluorescent protein (GFP), binds to mica via its Arg-tag based on ion exchange of naturally occurring potassium cations. Only non-specific binding was observed with the control protein that is free of the Arg-tag. This novel technology will be widely applicable to orient functional proteins on flat surfaces.

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Two‐dimensional electrolyte nature of exfoliated montmorillonite nanoplatelets fabricated by soap‐free emulsion polymerization and their affinity for cations

Lee

Weng

Liu

et al. 2010

J of Applied Polymer Sci

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Montmorillonite (MMT) nanoplatelets, fabricated by the exfoliation of MMT during participating in the soap-free emulsion polymerization of methyl methacrylate, were well-dispersed in water and performed like a two-dimensional electrolyte. Their ionic conductivity roughly follows the Manning's limiting law for the conduction of a polyelectrolyte. The dissociated MMT nanoplatelets that carry negative charges in water were able to rapidly adsorb cations, such as tris(2,2 0 -bipyridyl)ruthenium(II) (Ru(bpy)

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Ion Exchange on Muscovite Mica with Ultrahigh Specific Surface Area

Cited by 40 publications

References 0 publications

Preparation and properties of potassium-vermiculite films

Preparation and properties of potassium-vermiculite films

Reversible, site‐specific immobilization of polyarginine‐tagged fusion proteins on mica surfaces

Two‐dimensional electrolyte nature of exfoliated montmorillonite nanoplatelets fabricated by soap‐free emulsion polymerization and their affinity for cations

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