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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 林江珍 | |
| dc.contributor.author | Yu-Ting Yen | en |
| dc.contributor.author | 顏于婷 | zh_TW |
| dc.date.accessioned | 2021-06-13T04:11:25Z | - |
| dc.date.available | 2016-08-05 | |
| dc.date.copyright | 2011-08-05 | |
| dc.date.issued | 2011 | |
| dc.date.submitted | 2011-07-28 | |
| dc.identifier.citation | 1. Albrecht, M. A.; Evans, C. W.; Raston, C. L., Green chemistry and the health implications of nanoparticles. Green Chemistry 2006, 8 (5), 417.
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/32541 | - |
| dc.description.abstract | 本研究設計一新型奈米複合材料-奈米矽片銀，使用奈米矽片水溶液分散奈米銀粒子，並將其應用至抗菌生醫領域。奈米銀粒子之尺寸由3.8奈米至35奈米可藉由控制固態分散劑，即厚度為1奈米之奈米矽片，得到良好之可操控性。而奈米矽片帶有高表面電荷及高表面積之特殊性質為奈米銀粒子帶來不只良好可操控性，也是其具高穩定性與抗菌效果。本研究中，我們將不同比例之奈米矽片銀水溶液進行抗菌測試，發現抗菌能力對無論革蘭氏陰性菌或革蘭氏陽性菌均與奈米銀粒子大小成反比。更進一步以SEM觀察可發現表面細菌之形態，奈米矽片銀會由於表面帶有電荷而貼附至細菌表面，造成細菌之表面型態由原本飽滿轉化成萎縮更甚破裂之構形，且奈米矽片使銀粒子固定在表面而可能不經由穿透細胞即造成死亡。 | zh_TW |
| dc.description.abstract | A new class of nanohybrids were synthesized by complexing silver nanoparticles (AgNPs) with clay silicate platelets and evaluated for antibacterial activities. Various silver particle sizes in the range of 3.8 to 35 nm diameter were tailored by using nanoscale silicate platelets (NSP) at 1.0 nm thickness as supports. High stability and antibacterial activity were achieved. The efficacy of AgNPs on NSP was highly dependent on the silver particle size in the tests of controlling dermal pathogens including Gram-positive and Gram-negative bacteria. Scanning electron microscope had directly observed the adherence of the nanohybrids to the surface of individual bacteria. The role of NSP as surface supports for immobilizing AgNPs was elucidated by varying the AgNP/NSP weight ratio and testing for their differences in antibacterial efficacy. It is concluded that that hybridization of AgNPs on NSP surface allows the enhancement of AgNP activities and mitigation of their adversary effects on cells. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T04:11:25Z (GMT). No. of bitstreams: 1 ntu-100-R98549001-1.pdf: 2937297 bytes, checksum: f77a9c06dd0194b0ec6fdd32dea11f3d (MD5) Previous issue date: 2011 | en |
| dc.description.tableofcontents | Acknowledgement i
Abstract ii 摘要 iii Table of Contents iv Figure Captions vii Table Captions x Introduction 1 1.1.1. Intercalation of layered structure 3 1.1.2. Property of nano silicate platelet (NSP) 4 1.1.3. Cytotoxicity of nano silicate platelet (NSP)16 5 1.2. Introduction to silver nanoparticles (AgNPs) 5 1.2.1. Silver as antibacterial material 6 1.2.2. Bactericidal mechanism of silver 7 1.2.2.1. Bactericidal mechanism of silver ions (Ag+)27 7 1.2.2.2. Bactericidal mechanism of AgNPs 8 1.2.3. The size and shape effect on the antibacterial activity of AgNPs 9 1.2.4. Silver toxicity 10 1.2.5. Ion Release Kinetics of AgNPs 11 1.2.6. Summary of silver nanoparticles 12 1.3. Synthesis of nanocomposite consisting of AgNPs 12 1.3.1. Metal salt precursor. 13 1.3.2. Solvents 13 1.3.3. Reducing agents 14 1.3.4. Stabilizer 16 1.3.5. Summary of synthesizing silver nanoparticles 18 1.4. Research Objectives 19 Experimental Section 20 2.1. Materials 20 2.2. Stability of AgNPs with different stabilizers 20 2.3. Synthesis of various ratios of AgNP/NSP nanohybrids 21 2.4. Ultraviolet-visible (UV-Vis) Spectroscopy 22 2.5. Transmission Electron Microscopy (TEM) 23 2.6. Sources of bacteria 23 2.7. Evaluation of antibacterial activity 24 2.8. AgNP/NSP-Bacteria Interaction by Scanning Electron Microscopy (SEM) 24 Results and Discussion 26 3.1. Comparison of stability for AgNPs 26 3.2. Synthesis of various ratios of AgNP/NSP nanohybrid 30 3.2.1 Transmission electron microscopy (TEM) Morphology 33 3.2.2 Ultraviolet-visible spectroscopy 35 3.3. Synthesis of AgNP/NSP nanohybrid under different concentration 38 3.4. Growth Inhibition Effect 40 3.4.1. Antibacterial Activities of AgNP/clay (7/93) against E. coli 40 3.4.2. Scanning Electron Microscopy (SEM) Morphology 49 Conclusion 51 Future Work 53 References 54 | |
| dc.language.iso | en | |
| dc.title | 具高穩定性之奈米矽片銀水溶液及其抗菌性探討 | zh_TW |
| dc.title | High Stability and Antibacterial Activity of Silver Nanoparticles Supported by Clay Silicate Platelets | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 99-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 彭福佐,何國川 | |
| dc.subject.keyword | 奈米複材,奈米矽片,土,奈米銀粒子,抗菌, | zh_TW |
| dc.subject.keyword | nanohybrid, nano silicate platelets,clay,silver nanoparticles,antibacterial, | en |
| dc.relation.page | 67 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2011-07-28 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 高分子科學與工程學研究所 | zh_TW |
| 顯示於系所單位： | 高分子科學與工程學研究所 | |
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