跳跃间歇接触扫描电化学显微镜 (HIC-SECM) 作为一种新的局部溶解动力探针:应用于水溶液中酸溶解
Amelia R Perry1, Robert A Lazenby1, Maria Adobes-Vidal1
1Department of Chemistry, University of Warwick Gibbet Hill Road Coventry CV4 7AL UK p.r.unwin@warwick.ac.uk.
概括
跳跃间歇接触扫描电化学显微镜 (HIC-SECM) 显示,随着生长的酸晶体的溶解速度比预刻表面慢. 晶体历史显著影响溶解动力学.
科学领域:
- 物理化学 物理化学
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
背景情况:
- 了解晶体溶解对于各种应用至关重要,包括制药和材料加工.
- 以前的技术经常研究具有显著的先前溶解的表面,而不是初始动力学.
- 酸是一种广泛使用的化合物,在医学和化学合成中都具有相关性.
研究的目的:
- 通过使用一种新的HIC-SECM技术,研究酸 (110) 面的溶解动力学.
- 为了比较逐渐生长的晶体表面的溶解速率与经过部分溶解的晶体表面的溶解速率.
- 阐明表面形态在决定溶解行为的作用.
主要方法:
- 使用跳跃间歇接触扫描电化学显微镜 (HIC-SECM) 与超微电极 (UME).
- 通过将质子还原为的诱导过时溶解,定位酸.
- 采用有限元法 (FEM) 模拟来建模质量传输和动力学以评估速率常数.
主要成果:
- 与部分溶解的表面相比,成长 (110) 酸面的溶解动力学明显较慢.
- 原子力显微镜 (AFM) 显示,随着生长的表面具有延伸的露台,而部分溶解的表面表现出蚀刻特征和步骤位置.
- 通过FEM模拟,可以确定溶解速率常数.
结论:
- 酸晶体的溶解动力学是时间依赖的,并受到它们先前存在的表面形态和历史的强烈影响.
- 随着生长,带有露台的表面缓慢溶解,而带有蚀刻特征和步骤的表面迅速溶解.
- 精确评估溶解需要考虑晶体的历史,以了解依赖时间的流量变化.
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