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A facile route to design pH-responsive viscoelastic wormlike micelles: Smart use of hydrotropes

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Abstract.
A simple and effective route to design pH-responsive viscoelastic wormlike micelles based on commercial
compounds is reported. According to this route, pH-sensitive viscoelastic fluids can be easily obtained
by introducing a pH-responsive hydrotrope into a surfactant solution. In this paper, the mixed system
of cetyltrimethylammonium bromide (CTAB) and potassium phthalic acid (PPA) was studied in detail.
This pH-sensitive fluid can be switched between a gellike state and a waterlike state within a narrow
pH change. Rheology and DLS results revealed that the pH-sensitive flowing behavior was attributed to
the microstructure transition between wormlike micelles and short cylindrical micelles. Combined with
fluorescence anisotropy, NMR, and UV–vis, it was demonstrated that the pH response of viscoelastic fluid
originated from the different binding abilities of hydrotrope to surfactant as pH varies. Furthermore,
different kinds of hydrotropes can be utilized to prepare pH-responsive viscoelastic fluids in the desired
pH areas.

Keywords: pH responsive, Wormlike micelle, Viscoelastic fluid, Hydrotrope

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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 330 (2009) 449–455

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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