• 作者： Chen, Pao-Chi; Tai, Clifford Y.
• 中文摘要： 本文以反應法及非反應法進行擴散實驗,以決定鈣離子在矽膠中之擴散係數並探討離子在矽膠中之濃度分布。其中鈣離子溶液置於直管中矽膠之上層,因擴散之故,使鈣離子濃度下降,鈣離子濃度以電位滴定法標定。由所測出之鈣離子濃度、沈澱前鋒及擴散時間,則鈣離子在矽膠中之擴散係數,可由適當之數學模式加以求出。由反應法所得鈣離子平均擴散係數與非反應法所求取之值接近。此外,由所得鈣離子平均擴散係數及所提之數學模式,可模擬離子在矽膠中之濃度分布。
• 英文摘要： Diffusivity of calcium ion in silica gel contained in a single test tube was determined by a reacting method and a nonreacting method. The calcium ion in the supernatant solution was measured via potentiometric titration. Using the measured ion concentration together with precipitation front and diffusion time, the diffusivity of calcium ion in gel could be obtained through the assistance of a suitable mathematical model. The mean diffusivity of calcium ion obtained in the reacting method was observed to be in good correlation with that obtained in the nonreacting method. Using the measured diffusivity, the concentration profiles of ions in gel for the reacting method were predicted by the proposed model in this work.
• 中文關鍵字： 擴散係數; 矽膠; 微溶鹽; 沈澱; 鈣離子
• 英文關鍵字： Diffusivity; Silica Gel; Sparingly Soluble Salt; Precipitation; Calcium Ion