Stearic acid crystals

Sato, K. (1988) Observations of spatial correlation between growth spirals and inclusions in stearic acid crystals grown from solution. Japanese Journal of Applied Physics, 19, 1257 1264 and 1829-1836. 

Sorbitan is derived from sorbitol by dehydration and then esterified with fatty acids as described for PGME. Depending on the amount of fatty acids used for esterification the equilibrium reaction mixture may contain primarily sorbitan monoesters or triesters. Sorbitan esters of palmitic or stearic acid crystallize from melt in a stable a-like crystal form. 

Sodium phosphate Sodium sulfate Stearic acid (crystals) Sucrose Sulfuric acid (6 wt.%) Sulfuric acid (20 wt.%) Sulfuric acid (60 wt.%) Sulfuric acid (98 wt.%) Sulfur dioxide Tannic acid Tartaric acid Tetrahydrofuran... 

An acid soap of 2 1 complex ratio was discovered recently between triethanolamine stearate and stearic acid (13). In water the acid soap forms a lamellar liquid crystal phase at high temperatures, above 60°C, and transforms to a lamellar gel phase on cooling. The gel phase, however, is not stable at ambient temperature due to the occurrence of the hydrolysis reaction which converts the soap back to stearic acid which precipitates in the triethanolamine aqueous solution. A polymorphism of C, E, and possibly A forms of stearic acid crystals were found resulting from the hydrolysis reaction (8). 

Stearic Acid crystals 23 28 9 Plastic was unaffected for duration of test In accordance with ASTM D543-84 ... 

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