Influence of coexistent salt on hydrothermal synthesis of smectite and film-formability of the smectite

Nam, Hyun-Jeong; Ebina, Takeo; Ishii, Ryo; Yokota, Hiroshi; Mizukami, Fujio

doi:10.1016/j.clay.2009.08.005

Cited by 15 publications

(9 citation statements)

References 5 publications

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“…Evaluating the film‐forming properties of the inorganic filler is important when selecting a filler for gas barrier films. The film‐forming potential has been investigated for various types of clay, where the behavior of commercially available synthetic clays is inferior to that of natural smectite clays . Hence, it is important to develop raw synthetic clays with high film formation capability for film production.…”

Section: Development Of Clay‐based Filmsmentioning

confidence: 99%

“…Hence, it is important to develop raw synthetic clays with high film formation capability for film production. Several studies confirmed that film formation is enhanced by monovalent ions, solutions without excess ions, and high‐aspect‐ratio smectite …”

Section: Development Of Clay‐based Filmsmentioning

confidence: 99%

“…My research group succeeded in preparing a free‐standing transparent film of binder‐free synthetic smectite with low salt concentration, which is an example of CBF‐type IV (CBF‐IV). A free‐standing transparent film of binder‐free synthetic smectite was prepared, which was resistant to a temperature of 500 °C.…”

Section: Development Of Clay‐based Filmsmentioning

confidence: 99%

“…The nylon‐6‐organosmectite composite material produced by Toyota Central Research Laboratory in 1985 is a well‐known successful example of a polymer‐clay composite material. Since then, polymer‐clay composites have been widely developed, and many reviews of such materials have been published . Most of these materials are polymer‐based composites, in which clays are added as a minor component (<10 wt%).…”

Section: Introductionmentioning

confidence: 99%

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Development of Clay‐Based Films

Ebina

2018

The Chemical Record

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Phyllosilicate (clay) is used as a filler to improve the thermal stability and gas barrier properties of plastic films. However, few film preparation trials used clays as the main component. Many researchers have studied clay-based films (CBFs) that are heat-resistant and have high gas barrier properties against various gases (such as oxygen, water vapor, and hydrogen) over a wide range of temperatures. An organic binder improves the film toughness, but increases gas permeation. CBFs are obtained by solution casting and show excellent incombustibility and electrical insulation. Moreover, transparent films, e. g. for optoelectronic applications, can be prepared using synthetic clay, which does not contain colored impurities. The water vapor barrier properties of CBFs were achieved using reduced-charge smectite. Applications of CBF materials include food packaging, solar cell back sheets, hydrogen tanks, gaskets, water vapor barrier display films, substrates for printed electronics, thermal insulation, and electric insulation. Recent achievements in the field and future prospects are discussed.

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Section: Development Of Clay‐based Filmsmentioning

confidence: 99%

Section: Development Of Clay‐based Filmsmentioning

confidence: 99%

Section: Development Of Clay‐based Filmsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of Clay‐Based Films

Ebina

2018

The Chemical Record

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“…Smectite has been widely used in industrial fields because of its high specific gravity, cation exchange capacity and gelation property. 17), 18) The structure of smectite is a layered structure composed of two SiO 4 tetrahedral sheets and an (Al, Mg, Fe) (OH) 6 octahedral sheet. 18) Smectite has intercalated ions that cause charge neutralization by replacing the position of the Si 4+ and divalent metal ions.…”

Section: Introductionmentioning

confidence: 99%

<i>In vivo</i> evaluation of wound healing property of zinc smectite using a rat model

Sasaki

Sathi

Yamamoto

2016

J. Ceram. Soc. Japan

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Zinc, magnesium and silicon ions are known as bioactive ions that promote the hard and soft tissue regeneration. We hypothesized that Zn-smectite consisting of zinc and silicon ions provide a more potential biomaterial in regenerative medicine field. Zn-smectite powder was thus synthesized in this study and used for wound healing. The aim of the present work was to evaluate the effect of Zn-smectite on wound healing in rats. An aqueous solution was prepared by dissolving zinc chloride (ZnCl 2 ) and water glass in distilled water, and then refluxed at 90°C for 12 h; after which crystalline Zn-smectite powder was obtained. The amount of Zn 2+ and Si 4+ ions releasing from Zn-smectite in physiological saline was analyzed by inductively coupled plasma mass spectrometry (ICP-MS). It was observed that the amount of the Zn 2+ ion released from the Zn-smectite powder increased with the soaking time, but the released amount of Si 4+ ion decreased with the soaking time. To evaluate the biofunctional ability, Zn-smectite was applied to a full thickness surgical wound created in the rat's abdomen. In the results for skin regeneration, there was no significant difference in wound size between the control and Zn-smectite group at 1 and 2 weeks. However, it was observed that Zn-smectite promoted greater vascular regeneration and more skin appendages in comparison with the control. Zn-smectite can be expected to stimulate wound healing and heal the tissue close to the native tissue by releasing Zn 2+ and Si 4+ ions, suggesting that this newly formed material could offer greater potentiality in the field of regenerative medicine.

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