研究生: |
陳永基 Yung-ji chen |
---|---|
論文名稱: |
製備與鑑定高固含量二氧化矽溶膠水溶液 Preparation and Characterization of Nano-Dispersed Silica Sol Solution with High Solids Content |
指導教授: |
陳崇賢
Chorng-Shyan Chern |
口試委員: |
許榮木
Jung-Mu Hsu 林析右 Shi-Yow Lin |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 化學工程系 Department of Chemical Engineering |
論文出版年: | 2012 |
畢業學年度: | 100 |
語文別: | 中文 |
論文頁數: | 157 |
中文關鍵詞: | 奈米級二氧化矽溶膠水溶液 |
外文關鍵詞: | nano silica sol solution |
相關次數: | 點閱:275 下載:0 |
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摘 要
本研究探討如何合成均一相之奈米級二氧化矽溶膠水溶液。利用矽酸鈉為起始單體並以超純水作為溶劑,藉由強酸型陽離子交換樹脂IR120進行離子交換反應,即可得到穩定之奈米級二氧化矽溶膠水溶液。本研究另探討矽酸鈉起始量、熱處理、pH值、矽鈉比例、偶合劑與抑制劑添加量等變因的不同,對於二氧化矽溶膠之粒徑大小、分佈性、固含量及長置穩定性的影響,於濃縮製程中之固含量提升程度。並找出於最適化加入偶合劑的時機,達到最有效的利用,減少不必要浪費。
於本研究中發現,若奈米級二氧化矽溶膠水溶液的pH值在8∼10.5範圍間,以及矽鈉比例在30∼70之間,其溶液的穩定性極佳且粒徑可維持長久時間不至於變化。而當pH值愈低並接近8時,其粒子的表面電荷愈高,矽鈉比例則會愈接近70,形成溶液較佳的穩定性與粒子的分散性,且於濃縮製程中提供其二氧化矽固含量更高的提升量,並可達到35 % ~40%的高固含量及粒徑控制在50 nm以內。
Abstract
The objective of this study is to preparing and characterizing the homogeneous aqueous of silica sol with nanoparticles. It used sodium silicate solution (water glass) as the starting monomer with the solvent of ultrapure water to proceed ion-exchange reaction by strongly acidic cation exchange resin (Amberlite® IR120), then obtained the stably nano-dispersed silica sol solution. This study also investigated such as the amount of the initiator, heat process, the pH of the aqueous silica sol, the ratio of SiO2 to Na2O and the presence of inhibitor (TMA hydroxide) and coupling agent (A187) with different variables to influence such as the particle size and distribution of aqueous silica sol, silica solid content and the stability of the long period. And then find out the best optimal process when add into coupling agent achieving efficiency. Therefore, we can derive the tendency and extent of the condensed process from these factors.
The final result showed the pH value and the ratio of SiO2 to Na2O of silica sol that in the most stable range was 8 to 10.5 and 30 to 70, as well as pH approach to 8 that acquire the maximum value of the ratio of SiO2 to Na2O and the zeta potential on the particles to constitute the stability and dispersion. The silica sol solution could be further via concentrated method to obtain the higher elevations of silica solid content that achieved at 35 % to 40% as the maximum and the particle size with less than 50 nm.
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