Abstract
Thin crystals of colloidal gold exhibiting trigonal symmetry can be grown from solution by the reduction of chlorauric acid with salicylic acid. At room temperature the complete growth process requires approximately 240 hours, and the resulting crystals are about 100 Å in thickness and several microns in width. This system particularly lends itself to an electron microscopic and electron diffraction study of the nucleation and early stages of crystal growth. With this objective in mind samples were extracted from the growth medium at periodic intervals throughout the growth process and examined in the electron microscope. In order to examine the crystals at various stages of development as they actually exist in the growth medium, it was necessary to dilute the extracted samples several thousand to one with distilled water. Since this form of crystal growth is dependent on the gold concentration in the solution, dilution seems to be the most efficient way of halting growth without disturbing the crystal.
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Schedule a callMore From: Proceedings, annual meeting, Electron Microscopy Society of America
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