Preparation of a Self-Supporting, Multilayered Film of Montmorillonite

Isayama, M.; Sakata, Kanji; Kunitake, Toyoki

doi:10.1016/b978-1-4832-8380-7.50143-7

Cited by 1 publication

(1 citation statement)

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“…Smectite-type clay minerals are very versatile materials, which find industrial application in a broad range of activities such as adsorption, ion exchange, and catalysis , Thus, they can be dispersed in water, and clay mineral films are prepared by simple gravitational sedimentation processes. , Organic cations can be ion exchanged, giving the clay particles a hydrophobic character. ,, If one can control the ordering of these molecules on the surface and if the organization of the clay particles into films can be controlled too, then organized materials are obtained, which by proper choice of clay particles and molecules may exhibit unique electronic, optical, and electrochemical properties.…”

Section: Introductionmentioning

confidence: 99%

Multilayered Clay Films: Atomic Force Microscopy Study and Modeling

Duffel¹,

Schoonheydt²,

Grim³

et al. 1999

Langmuir

110

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Self-assembled natural and synthetic clay−polymer films have been prepared by sequential adsorption of poly(diallyldimethylammonium chloride) (PDDA) and clay particles onto mica. The influence of pH, polymer concentration, and clay particle size on the building and roughness of mono- and multicycle depositions was investigated. The monocyclic deposition gives a submonolayer of clay particles. The thickness of the films increases linearly with the number of cycles in the deposition process, thus giving an average increase of thickness per cycles which depends on clay particle size and PDDA concentration. The film roughness is affected by the same parameters and increases with particle size of the clay and PDDA concentration. Optimal conditions for the deposition of smooth multilayer films consist of the combined use of a 0.05−0.5% (w/w) aqueous solution of PDDA and a 0.05% (w/w) clay suspension at pH = 9−10. The film formation was modeled assuming a deposition of homogeneous layers partially covering the surface. The model indicates that Laponite films are characterized by significantly higher surface coverages than natural clay films.

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