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Updated: May 13, 2025

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy
Published on: February 27, 2015
机遇和挑战 通过原子力显微镜粘附测量在显微尺度上确定巧克力的表面自由能量
Sarah Schroeder1, Koen Dewettinck2, Volker Heinz3
1DIL e.V. - German Institute of Food Technologies, Professor-von-Klitzing-Str. 7, Quakenbrück 49160, Germany; Food Structure & Function Research Group, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, Gent 9000, Belgium.
使用原子力显微镜 (AFM) 在巧克力表面上测量了表面自由能量 (SFE). 闪亮的巧克力区域比色区域具有更高的SFE和粘附力,尽管AFM结果与接触角度测量没有直接相关.
科学领域:
- 食品科学和材料科学 食品科学和材料科学
- 表面科学和部落学.
背景情况:
- 表面自由能量 (SFE) 对于食品加工至关重要,它影响了可湿性和材料相互作用,比如巧克力成型.
- 了解SFE变化是解释巧克力光泽差异解后的关键.
研究的目的:
- 使用原子力显微镜 (AFM) 在不同的巧克力光泽区域上以微观尺度确定SFE.
- 调查AFM粘附测量和巧克力表面上的SFE之间的关系.
主要方法:
- AFM尖端功能化,以改变其SFE以进行精确的粘附测量.
- 粘附力测绘是在,光泽和均的巧克力表面上进行的.
- 使用两个基于约翰逊-肯达尔-罗伯特 (JKR) 的模型,从粘附数据计算出SFE,同时考虑了粗度和湿度等参数.
主要成果:
- 粘附力和计算的SFE在不同的巧克力光泽面积上有很大的差异.
- 观察到一个明显的趋势:光泽区域的粘附度和SFE比同质区域更高,其次是色区域 (光泽>同质>色).
- 从AFM粘附测量中获得的SFE值与从接触角度测量中获得的SFE值没有直接相关.
结论:
- AFM粘附度测量提供了对巧克力表面微观SFE差异的洞察,与视觉光泽相关.
- 该研究强调了AFM在表征食品加工和产品质量相关的表面特性方面的潜力.
- 需要进一步的研究来协调AFM衍生的SFE与接触角度测量,以获得全面的理解.
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