In Situ Monitoring of Generation and Precipitation of Ferric Hydroxide Sol with a Piezoelectric Quartz Crystal Impedance Analyzer.
In Situ Monitoring of Generation and Precipitation of Ferric Hydroxide Sol with a Piezoelectric Quartz Crystal Impedance Analyzer.
复制标题
使用压电石英晶体阻抗分析仪原位监测氢氧化铁溶胶的生成和沉淀。
DOI：
10.1006/jcis.2000.7397
复制
发表时间：
2001
影响因子：
9.9
通讯作者：
S. Yao
中科院分区：
文献类型：
--
作者：
Youyu Zhang;Q. Xie;F. Yin;S. Yao
采用压电石英晶体（PQC）阻抗技术对90 ℃水溶液中氢氧化铁溶胶的生成和沉淀过程进行了原位监测。得到了PQC谐振的等效电路参数、谐振频率以及电声电导谱的半峰宽Δ f（G1/2）。将硝酸铁溶液加入到热水中的过程可分为溶胶生成与同时吸附、吸附平衡和氢氧化铁溶胶沉淀三个阶段。采用电极/溶液界面两个连续反应的方案分析了氢氧化铁溶胶在Au电极上的吸附动力学。此外，对电解质诱导的胶体沉淀进行了监测和讨论。研究了温度对液体中PQC共振行为的影响。由于PQC阻抗技术提供了多维的压电信息，在现场，它是强烈推荐用于研究溶胶-凝胶生成和沉淀过程。版权所有2001学术出版社。
The piezoelectric quartz crystal (PQC) impedance technique was applied to monitor in situ generation and precipitation of the ferric hydroxide sol in aqueous solutions at 90 degrees C. Equivalent circuit parameters and resonant frequencies as well as the half-peak width of the electroacoustic conductance spectrum deltaf(G1/2) for the PQC resonance were obtained and analyzed. Three stages, sol generation and simultaneous adsorption, adsorption equilibrium, and precipitation of ferric hydroxide sol could be identified in the process of adding the ferric nitrate solution into the hot water. A scheme of two consecutive reactions occurring at the electrode/solution interface was used to analyze the adsorption kinetics of ferric hydroxide sol onto the Au electrode. In addition, the electrolyte-induced precipitation of the colloid was monitored and discussed. Temperature effect on the PQC resonance behavior in liquid was also investigated. Since the PQC impedance technique provides multidimensional piezoelectric information in situ, it is highly recommended for studying the process of sol-gel generation and precipitation. Copyright 2001 Academic Press.