Using Two-Dimensional Colloidal Crystals To Understand Crystallography.
Using Two-Dimensional Colloidal Crystals To Understand Crystallography.
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使用二维胶体晶体来了解晶体学。
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
N. Loening
中科院分区：
文献类型：
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作者：
Stephanie A. Bossé;N. Loening
X射线晶体学是现代化学和生物化学的一项基本技术，但由于缺乏设备、生成衍射质量分子晶体的时间尺度以及分析所涉及的数学水平，本科生很少遇到它。产生的衍射图案。在这里，我们描述了一个简单的实验，避免所有这三个限制，通过使用微米大小的乳胶球形成二维胶体晶体。从悬浮在水中的乳胶球溶液开始，学生们能够在短短几分钟内生长出吸收可见光的晶体。通过激光束穿过这些晶体形成的衍射图案揭示了它们的对称性，并通过使用三角学，允许确定组成晶体的颗粒的大小。这个实验允许学生在一个或两个实验时间内以动手的方式学习晶体学的基本原理。
X-ray crystallography is an essential technique for modern chemistry and biochemistry, but it is infrequently encountered by undergraduate students owing to lack of access to equipment, the time-scale for generating diffraction-quality molecular crystals, and the level of mathematics involved in analyzing the resulting diffraction patterns. Herein, we describe a simple experiment that avoids all three of these limitations by using micrometer-sized latex spheres to form two-dimensional colloidal crystals. Starting with a solution of latex spheres suspended in water, students are able, in only a few minutes, to grow crystals that diffract visible light. Diffraction patterns formed by passing a laser beam through these crystals reveal their symmetry and, by using trigonometry, allow the determination of the size of the particles that make up the crystal. This experiment allows students to learn the basic principles of crystallography in a hands-on fashion within one or two laboratory periods.