Super Stability of Ag Nanoparticle in Crystalline Lamellar (Lc) Liquid Crystal Matrix at Different pH Environment

Mohd Yasin, Siti Mariah and Badruddin, Irfan Anjum and Johan, Mohd Rafie (2019) Super Stability of Ag Nanoparticle in Crystalline Lamellar (Lc) Liquid Crystal Matrix at Different pH Environment. Symmetry, 12 (1). p. 31. ISSN 2073-8994, DOI

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The symmetry concept in this paper is related to the natural self-assembly of noble metal nanoparticles in the long range periodic structure of liquid crystal (LC). The current study deliberates the effect of pH on the stability of nanoparticles (NPs) in the lamellar phase of a lyotropic LC environment. The LC was prepared by the mass ratio 0.33:0.22:0.45 for (HDTABr):1-pentanol:water. The LC containing silver nanoparticles (AgNPs) was prepared by replacing the water with Ag solution. The AgNPs were produced by the in situ preparation method in LC. The solution of AgNPs-LC was varied at different pH. The absorption intensities were determined by using ultra-violet spectroscopy (UV-vis). The surface potential and hydrodynamic particle size were determined by using Zeta-potential (measurements). The surface enhanced Raman spectroscopy (SERS) was carried out to enhance the Raman signals of 4-aminobenzenethiol (4-ABT) deposited onto AgNPs as substrate. It is found that all characterizations exhibited super stability for AgNPs dispersed in LC at pH = 3 to 12 with the optimum stability at pH = 5-6. The remarkable stability of NPs is an important indicator of the various applications in nanotechnology and nanoscience fields. © 2019 by the authors.

Item Type: Article
Funders: King Khalid University with grant number R.G.P. 2/11/39, University of Malaya with grant number (PG230-2015A) and RU 2018 NANOCAT
Uncontrolled Keywords: silver nanoparticle; liquid crystal; zeta potential; SERS; 4-aminobenzenethiol
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering
Deputy Vice Chancellor (Research & Innovation) Office > Nanotechnology & Catalysis Research Centre
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 05 Jun 2020 01:09
Last Modified: 05 Jun 2020 01:09

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