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Preparation and characterization of layer-by-layer self-assembled polyelectrolyte multilayer films doped with surface-capped SiO2 nanoparticles

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Abstract.
SiO2 nanoparticles capped with γ -aminopropyltrimethoxysilane were doped into polyelectrolyte (poly-
(allylamine hydrochloride), PAH, and poly(acrylic acid), PAA) multilayer films via spin-assisted layer-bylayer self-assembly. The resulting as-prepared multilayer films were heated at a proper temperature to
generate cross-linked composite films with increased adhesion to substrates. The tribological behavior
of the multilayer films was evaluated on a microtribometer. It was found that SiO2-doped composite
films had better wear resistance than pure polyelectrolyte multilayers, possibly because doped
SiO2 nanoparticles were capable of enhancing load-carrying capacity and had “miniature ball bearings”
effect. Moreover, heat-treatment had significant effect on the morphology of the composite films.
Namely, heat-treated (SiO2/PAA)9 film had a larger roughness than the as-prepared one, due to heattreatment-
induced agglomeration of SiO2 nanoparticles and initiation of defects. However, heat-treated
(PAH/PAA)3/(SiO2/PAA)3(PAH/PAA)3 film had greatly reduced roughness than the as-prepared one, and it
showed considerably improved wear resistance as well. This could be closely related to the “sandwichlike”
structure of the composite multilayer film. Namely, the outermost strata of composite multilayer
film were able to eliminate defects associated with the middle strata, allowing nanoparticles therein to
maintain strength and robustness while keeping soft and fluid-like exposed surface. And the inner strata
were well anchored to substrate and acted as an initial “bed” for SiO2 nanoparticles to be inhabited,
resulting in good antiwear ability.

Keywords:
Polyelectrolyte
SiO2 nanoparticles
Spin-assisted layer-by-layer self-assembly
Composite multilayer film
Preparation
Friction and wear behavior

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Informasi Detail

Judul Seri

Journal of Colloid and Interface Science

No. Panggil

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Penerbit

London : Elsevier Inc.., 2009

Deskripsi Fisik

Journal of Colloid and Interface Science 333 (2009) 776–781

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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