SEM of caffeine crystals, x900.

SEM of caffeine crystals, x900.

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Caption: Scanning electron micrograph of anhydrous caffeine crystals (1,3,7-trimethylxanthine). They were produced by sublimation, that is, by heating the solid until it is vapourised, then condensing the vapour. This drives water out of the structure resulting in anhydrous crystals. Examples of twinning can be seen here, where crystals at different orientations interpenetrate producing cross shapes. Caffeine stimulates the central nervous system increasing alertness and deferring fatigue. It is often contained in analgesic preparations with aspirin or codeine, and it is a diuretic. It occurs in coffee beans, tea leaves & cola nuts. Magnification: x900 at 8x10 inch size

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Keywords: anhydrous caffeine crystals, caffeine crystals, chemical, chemistry, compound, compounds, crystal, crystals, twinning in crystals

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