Flexible inorganic films and coatings

Ballard, D. G. H.; Rideal, G. R.

doi:10.1007/bf00560644

Cited by 72 publications

(33 citation statements)

References 6 publications

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“…The fact that the interlayer cation in vermiculite is hydrated allows it to be swollen by a treatment in aqueous salt solutions, 3,4 and when followed by delamination flexible films can be produced. 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%

“…5 The presence of water in vermiculite films due to the presence of the strongly hydrated cations used in the swelling step may reduce the dielectric constant significantly when compared to sheet mica. In this study the effect of a second cation exchange after swelling and delamination on the dielectric properties of vermiculite films has been investigated.…”

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and properties of potassium-vermiculite films

et al. 1998

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“…The resultant fi lms are structurally analogous to the organic crystalline polyethylene, have properties to organic fi lms, and the maximum elongation is up to 6%. [ 6 ] In addition, inorganicorganic hybrid systems are also an important kind of fl exible materials. For example, silver nanowires were deposited onto polyethylene terephthalate (PET) substrates, these silver nanowires/PET fi lms are electromechanically robust, which make these fi lms an ideal fl exible transparent conducting fi lms to replace indium tin oxide (ITO) fi lms.…”

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confidence: 99%

Carbon Nanotubes and Graphene for Flexible Electrochemical Energy Storage: from Materials to Devices

2016

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Flexible electrochemical energy storage (FEES) devices have received great attention as a promising power source for the emerging field of flexible and wearable electronic devices. Carbon nanotubes (CNTs) and graphene have many excellent properties that make them ideally suited for use in FEES devices. A brief definition of FEES devices is provided, followed by a detailed overview of various structural models for achieving different FEES devices. The latest research developments on the use of CNTs and graphene in FEES devices are summarized. Finally, future prospects and important research directions in the areas of CNT- and graphene-based flexible electrode synthesis and device integration are discussed.

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“…E xfoliation of layered materials in solution leads to dispersed single or few atomic/molecular layers that can be readily reassembled into paper-like films by filtration or casting [1][2][3][4][5] . The resulting films usually have a lamellar microstructure due to stacking of the high aspect ratio two-dimensional (2D) sheets.…”

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confidence: 99%

Self-assembled two-dimensional nanofluidic proton channels with high thermal stability

et al. 2015

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Exfoliated two-dimensional (2D) sheets can readily stack to form flexible, free-standing films with lamellar microstructure. The interlayer spaces in such lamellar films form a percolated network of molecularly sized, 2D nanochannels that could be used to regulate molecular transport. Here we report self-assembled clay-based 2D nanofluidic channels with surface charge-governed proton conductivity. Proton conductivity of these 2D channels exceeds that of acid solution for concentrations up to 0.1 M, and remains stable as the reservoir concentration is varied by orders of magnitude. Proton transport occurs through a Grotthuss mechanism, with activation energy and mobility of 0.19 eV and 1.2 Â 10 À 3 cm 2 V À 1 s À 1 , respectively. Vermiculite nanochannels exhibit extraordinary thermal stability, maintaining their proton conduction functions even after annealing at 500°C in air. The ease of constructing massive arrays of stable 2D nanochannels without lithography should prove useful to the study of confined ionic transport, and will enable new ionic device designs.

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Flexible inorganic films and coatings

Cited by 72 publications

References 6 publications

Preparation and properties of potassium-vermiculite films

Preparation and properties of potassium-vermiculite films

Carbon Nanotubes and Graphene for Flexible Electrochemical Energy Storage: from Materials to Devices

Self-assembled two-dimensional nanofluidic proton channels with high thermal stability

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