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、pH值、矽鈉比例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，並於濃縮製程中之固含量提升程度。
　　另外，本研究藉由樹脂再生之方法來將使用過的陽離子交換樹脂予以再生，並將其應用在製備奈米級二氧化矽溶膠水溶液上，且探討其基本性質與原先的樣品間之差異，以及其分析鑑定的結果是否符合理論之預期。
　　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 % 之最高固含量及粒徑控制在50 nm以內。

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, the pH of the aqueous silica sol, the ratio of SiO2 to Na2O and the presence of inhibitor (TMA hydroxide) 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. Therefore, we can derive the tendency and extent of the condensed process from these factors.
In addition, the manner of resin regenerate procedure was involved in this thesis to deal with the used cation exchange resin to be renewed availability then applied that to manufacture the aqueous silica sol in nanoscale. Furthermore, the difference about the basic property of the silica sol regenerate solution such as the particle size and distribution, pH value and silica solid content, etc., that between the precursory samples was discussed and authenticated the results of the identification whether that conform to the expectative theory.
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 to 35 % as the maximum and the particle size with less than 50 nm.

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