Abstract
We report pH-responsive control of the colloidal dispersions of imidazolium cations-modified gold nanoparticles by using poly(acrylic acid) (PAA). The gold nanoparticles were precipitated when PAA (Mw=25000) was added in aqueous solution of which pH was 2.4. The precipitate was redissolved when the solution’s pH dropped below pH 1.9 and rose above pH 5.5. According to UV-visible spectra, transmission electron microscopy (TEM) observations, and dynamic light scattering (DLS) analysis, it is indicated that the gold nanoparticles at lower pH (pH<1.9) were well redispersed in aqueous solution and aggregates with a diameter of 115±21 nm of the gold nanoparticles were formed at above pH 5.5. Effect of molecular weights of PAA was also studied.
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Naka, K., Tanaka, H. & Chujo, Y. pH Responsive Aggregation of Imidazolium Cations-Modified Gold Nanoparticles with Poly(acrylic acid) in Aqueous Solution. Polym J 39, 1122–1127 (2007). https://doi.org/10.1295/polymj.PJ2007075
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DOI: https://doi.org/10.1295/polymj.PJ2007075
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