Photoinitiated Reversible Formation of Small Gold Crystallites in Polymer Gels

Abstract

Reversible formation of gold crystallites takes place in methanol-swollen cross-linked polymers of diallyldimethylammonium chloride. Metal particles are generated in air-saturated gels via the photoreduction of Au(III) complexes. Oxidation of the crystallites proceeds through a dark reaction that regenerates the Au(III) species. The particle generation process remains completely reversible throughout several formation and decay cycles, indicating that this gel system behaves in a photoresponsive fashion.

Konjac Biomolecules Assisted–Rod/Spherical Shaped Lead Nano Powder Synthesized by Electrolytic Process and Its Characterization Studies

“…Photo-initiators like phenolic compounds absorb light in the UV-visible region and form reactive intermediates such as free radicals [6]. Methanol is also a photoinitiator, used for such purpose [7]. These intermediates (or hydrated electrons) are serving as a reducing agent and prevents the oxidation of lead nanoparticles.…”

Development of Heterodyne Detection of Dynamic Light Scattering Enhanced by the Talbot Effect for the Size Measurement of Nanoparticles

“…4 It is required to use uniformly sized nanopartilces for applications, and various synthesis methods have been proposed for the preparation of mono-dispersed nanoparticles in liquid, polymer, micelle, glass matrix by chemical reduction or photoreduction. [5][6][7][8][9] In recent years, a microchip or microreactor has been utilized for nanoparticle synthesis, and several researchers have reported on the successful formation of mono-dispersed particles. 10,11 This is because such a small reaction space offers a uniform reaction environment, such as uniformity of temperature and concentrations of the reactants inside a microchannel.…”

Preparation of nanosized gold particles in a biopolymer using UV photoactivation

“…Synthesis and characterization of gold and other noble metal nanoparticles have gained tremendous attention due to their manifold applications in different branches of science and engineering [1][2][3][4][5][6][7][8][9]. Researchers are motivated to create unique gold particles with new physical properties, which include optical properties, magnetic properties, and catalytic activity, using various methods.…”