Preparation and characterization of nano silver/chitosan composite membranes 林科町、
E-mail: [email protected]
ABSTRACT
Chitosan salts were prepared by reacting chitosan with hydrochloride, nitric acid, and acetic acid, respectively. Chitosan salt aqueous solutions with concentration 0.5, 0.75, and 1.0 % (w/v) were further prepared and reacted with silver nitrate as well as
glutaraldehyde. Solution casting method was used to prepare films. These films showed moisture absorptivity in a range between 16 and 29 %. The FESEM indicated that the size of a majority of the silver compound particles which were dispersed in the films ranged between 6 and 74 nm. Silver compound particles which dispersed in chitosan nitrate salt films had smaller average size than that which dispersed in chitosan hydrochloride salt films. The FTIR spectroscopy revealed that chitosan was crosslinked by
glutaraldehyde. In contact angle measurement results, crosslined films had larger contact angle than that whitout crosslinked.
Evaluation of tensile strength of films these were conducted using an rheometer. It was found that films with glutaraldehyde had higher tensile strength than that without glutaraldehyde. Elongation was increased with increasing the salt concentration, but decreased with increasing the glutaraldehyde content. From the impedance analysis results, it was found that the conductivity of membranes can be up to 1.2×10-3 S/cm.
Keywords : chitosan ; membranes ; conductivity ; tensile strength
Table of Contents
封面內頁 簽名頁 授權書... iii 中文摘要... iv 英文摘要... v 誌 謝... vi 目錄... vii 圖目錄... x 表目
錄... xiv 1.研究目的... 1 2.文獻回顧... 2 2.1奈米科 技... 2 2.1.1奈米材料與奈米技術... 2 2.1.2奈米粒子的性質... 3 2.1.3奈米 銀... 4 2.1.4奈米材料之應用... 5 2.2幾丁質與幾丁聚醣簡介... 8 2.2.1幾丁質與 幾丁聚醣來源... 8 2.2.2幾丁質與幾丁聚醣及其衍生物之結構... 8 2.2.3幾丁質之製備... 9 2.2.4 幾丁聚醣之製備... 10 2.2.5幾丁聚醣化學性質... 11 2.2.6以澆鑄成膜之相關研究... 13 2.3薄膜簡介... 14 2.3.1薄膜的分類... 14 2.3.2薄膜製備方法... 15 2.4聚電 解質(polyelectrolyte)... 17 2.4.1聚電解質之應用... 18 3.材料與方法... 19 3.1實驗材 料... 19 3.2儀器設備... 20 3.3實驗設計... 21 3.4實驗流
程... 23 3.5幾丁聚醣鹽類之製備... 24 3.6薄膜的製作... 24 3.7分析方 法... 25 3.7.1吸濕率測試... 25 3.7.2場發射掃描式電子顯微鏡... 25 3.7.3傅立葉 紅外線吸收光譜儀... 26 3.7.4接觸角分析... 27 3.7.5抗拉強度測試... 28 3.7.6電阻抗 分析... 28 4.結果與討論... 30 4.1薄膜樣品製備... 30 4.2場發射電子顯微 鏡觀察(FESEM... 34 4.3傅立葉紅外線吸收光譜分析... 49 4.4接觸角分析(contact angle)... 53 4.5抗 拉強度測試分析(tensile strength measurement)67 4.5.1拉力部份... 67 4.5.2斷裂伸長率部份...
81 4.6導電度測試分析... 93 5.結論... 107 參考文獻... 108 REFERENCES
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