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Synthesis and characterization of silver nanoparticles in lamellar lyotropic liquid crystal / Siti Mariah Mohd Yasin

Lamellar lyotropic liquid crystal-silver nanoparticles (LLLC-AgNPs) are synthesized using the in-situ method. The polarizer microscope showed a mosaic-like pattern with fan shape textures. The high resolution transmission electron microscope (HRTEM) confirmed that the AgNPs are spherical in shape wi...

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Main Author: Siti Mariah , Mohd Yasin
Format: Thesis
Published: 2020
Subjects:
TA Engineering (General). Civil engineering (General)
TP Chemical technology
Online Access:http://studentsrepo.um.edu.my/14233/1/Siti_Mariah.pdf
http://studentsrepo.um.edu.my/14233/2/Siti_Mariah.pdf
http://studentsrepo.um.edu.my/14233/
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spelling my.um.stud.142332023-04-12T23:22:21Z Synthesis and characterization of silver nanoparticles in lamellar lyotropic liquid crystal / Siti Mariah Mohd Yasin Siti Mariah , Mohd Yasin TA Engineering (General). Civil engineering (General) TP Chemical technology Lamellar lyotropic liquid crystal-silver nanoparticles (LLLC-AgNPs) are synthesized using the in-situ method. The polarizer microscope showed a mosaic-like pattern with fan shape textures. The high resolution transmission electron microscope (HRTEM) confirmed that the AgNPs are spherical in shape with 4 – 12 nm size. Differential scanning calorimetry (DSC) determined the LLLC-AgNPs transition anisotropic phase to the highly ordered isotropic phase at 300 °C, and crystallinity was completed at 350 °C. Thermogravimetric analysis (TGA) verified that the LLLC-AgNPs were completely decomposed at 700 °C. Ultra-violet visible spectroscopy (UV-vis) found the absorption peaks at around 400 nm and proved that the AgNPs is distributed in a polydispersed manner. With the increase in temperature, the polydispersity behavior decreases indicating that the AgNPs' growth is restricted and the nucleation process took part. The absorption and bandwidth decrease after 4 weeks which proves that the AgNPs is distributed in a monodispersed manner. The granularity and dispersity of AgNPs were further confirmed by photoluminescence (PL). By varying pHs, surface enhance Raman spectroscopy (SERS) demonstrated the high signal of 4-ABT at pH = 5 – 12. The electrical potential achieved maximum, +70.7 mV at pH = 5 – 6, and all pH ranges still exceed the minimum stability within 2 months, which proves the super stability of AgNPs dispersed in the LLLC domain. The vector network analyzer (VNA) verified that the LLLC is a lossy dielectric and radiates higher magnetic energy, while, the LLLC-AgNPs are exhibited as storing dielectric material and radiating lower of magnetic energy. 2020-09 Thesis NonPeerReviewed application/pdf http://studentsrepo.um.edu.my/14233/1/Siti_Mariah.pdf application/pdf http://studentsrepo.um.edu.my/14233/2/Siti_Mariah.pdf Siti Mariah , Mohd Yasin (2020) Synthesis and characterization of silver nanoparticles in lamellar lyotropic liquid crystal / Siti Mariah Mohd Yasin. PhD thesis, Universiti Malaya. http://studentsrepo.um.edu.my/14233/
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Student Repository
url_provider http://studentsrepo.um.edu.my/
topic TA Engineering (General). Civil engineering (General)
TP Chemical technology
spellingShingle TA Engineering (General). Civil engineering (General)
TP Chemical technology
Siti Mariah , Mohd Yasin
Synthesis and characterization of silver nanoparticles in lamellar lyotropic liquid crystal / Siti Mariah Mohd Yasin
description Lamellar lyotropic liquid crystal-silver nanoparticles (LLLC-AgNPs) are synthesized using the in-situ method. The polarizer microscope showed a mosaic-like pattern with fan shape textures. The high resolution transmission electron microscope (HRTEM) confirmed that the AgNPs are spherical in shape with 4 – 12 nm size. Differential scanning calorimetry (DSC) determined the LLLC-AgNPs transition anisotropic phase to the highly ordered isotropic phase at 300 °C, and crystallinity was completed at 350 °C. Thermogravimetric analysis (TGA) verified that the LLLC-AgNPs were completely decomposed at 700 °C. Ultra-violet visible spectroscopy (UV-vis) found the absorption peaks at around 400 nm and proved that the AgNPs is distributed in a polydispersed manner. With the increase in temperature, the polydispersity behavior decreases indicating that the AgNPs' growth is restricted and the nucleation process took part. The absorption and bandwidth decrease after 4 weeks which proves that the AgNPs is distributed in a monodispersed manner. The granularity and dispersity of AgNPs were further confirmed by photoluminescence (PL). By varying pHs, surface enhance Raman spectroscopy (SERS) demonstrated the high signal of 4-ABT at pH = 5 – 12. The electrical potential achieved maximum, +70.7 mV at pH = 5 – 6, and all pH ranges still exceed the minimum stability within 2 months, which proves the super stability of AgNPs dispersed in the LLLC domain. The vector network analyzer (VNA) verified that the LLLC is a lossy dielectric and radiates higher magnetic energy, while, the LLLC-AgNPs are exhibited as storing dielectric material and radiating lower of magnetic energy.
format Thesis
author Siti Mariah , Mohd Yasin
author_facet Siti Mariah , Mohd Yasin
author_sort Siti Mariah , Mohd Yasin
title Synthesis and characterization of silver nanoparticles in lamellar lyotropic liquid crystal / Siti Mariah Mohd Yasin
title_short Synthesis and characterization of silver nanoparticles in lamellar lyotropic liquid crystal / Siti Mariah Mohd Yasin
title_full Synthesis and characterization of silver nanoparticles in lamellar lyotropic liquid crystal / Siti Mariah Mohd Yasin
title_fullStr Synthesis and characterization of silver nanoparticles in lamellar lyotropic liquid crystal / Siti Mariah Mohd Yasin
title_full_unstemmed Synthesis and characterization of silver nanoparticles in lamellar lyotropic liquid crystal / Siti Mariah Mohd Yasin
title_sort synthesis and characterization of silver nanoparticles in lamellar lyotropic liquid crystal / siti mariah mohd yasin
publishDate 2020
url http://studentsrepo.um.edu.my/14233/1/Siti_Mariah.pdf
http://studentsrepo.um.edu.my/14233/2/Siti_Mariah.pdf
http://studentsrepo.um.edu.my/14233/
_version_ 1764223126467510272
score 13.211869

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