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Polymers 2018, 10(1), 99; doi:10.3390/polym10010099

Temperature-Responsive Polymer Microgel-Gold Nanorods Composite Particles: Physicochemical Characterization and Cytocompatibility

King Abdullah Institute for Nanotechnology, King Saud University, Riyadh 11451, Saudi Arabia
College of Pharmacy, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
Central Metallurgical Research and Development Institute, CMRDI, Helwan 11421, Egypt
Department of Chemistry, King Saud University, Riyadh 11451, Saudi Arabia
Author to whom correspondence should be addressed.
Received: 13 December 2017 / Revised: 17 January 2018 / Accepted: 18 January 2018 / Published: 20 January 2018
(This article belongs to the Special Issue Stimuli Responsive Polymers)
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In this paper, we report an easy route for preparing new metal nanorod-polymer composites consisting of gold nanorods, Au NRs, and temperature responsive copolymer “microgel” particles. The microgel particles of ~200 nm in size, which contain carboxylic acid groups, were prepared by surfactant-free emulsion polymerization of a selected mixture made of N-isopropylacylamide and acrylic acid in the presence of a cross-linker N,N′-methylenebisacrylamide. The electrostatic interactions between the cationic cetyltrimethylammonium bromide (CTAB) stabilized Au NRs and anionic microgel particles were expected to occur in order to prepare stable Au NRs-microgel composite particles. The optical and structural characterization of the composite was achieved using UV-Vis spectroscopy, Field emission scanning electron microscopy (FESEM), Transmission electron microscopy (TEM) and dynamic light scattering (DLS). TEM image shows that Au NRs are attached on the surface of the microgel particles. Dynamic light scattering measurements prove that the composite particles are temperature responsive, which means the particles undergo a decrease in size as the temperature increases above its phase transition temperature. In vitro cytotoxicity of the composite materials were tested by 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT), Lactate dehydrogenase (LDH), and hemolysis assay, which showed non-toxicity (biocompatibility). View Full-Text
Keywords: microgel; gold nanorods; temperature responsive; poly-N-isopropylacrylamide microgel; gold nanorods; temperature responsive; poly-N-isopropylacrylamide

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Khan, A.; Khan, T.H.; Ahamed, M.; El-Toni, A.M.; Aldalbahi, A.; Alam, J.; Ahamad, T. Temperature-Responsive Polymer Microgel-Gold Nanorods Composite Particles: Physicochemical Characterization and Cytocompatibility. Polymers 2018, 10, 99.

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