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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| Format: | Thesis |
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2020
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| Online Access: | http://studentsrepo.um.edu.my/14233/ http://studentsrepo.um.edu.my/14233/1/Siti_Mariah.pdf http://studentsrepo.um.edu.my/14233/2/Siti_Mariah.pdf |
| _version_ | 1848774927065284608 |
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| author | Siti Mariah , Mohd Yasin |
| author_facet | Siti Mariah , Mohd Yasin |
| author_sort | Siti Mariah , Mohd Yasin |
| building | UM Research Repository |
| collection | Online Access |
| 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.
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| first_indexed | 2025-11-14T14:06:04Z |
| format | Thesis |
| id | um-14233 |
| institution | University Malaya |
| institution_category | Local University |
| last_indexed | 2025-11-14T14:06:04Z |
| publishDate | 2020 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | um-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/ |
| 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 |
| title | 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_short | 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 |
| topic | TA Engineering (General). Civil engineering (General) TP Chemical technology |
| url | http://studentsrepo.um.edu.my/14233/ http://studentsrepo.um.edu.my/14233/1/Siti_Mariah.pdf http://studentsrepo.um.edu.my/14233/2/Siti_Mariah.pdf |