Sep 30, 2005
Posted at 11:37 am by David Bradley
In chemistry, hydrophobicity (from the combining form of water in Greek hydro- and for fear phobos) is the physical property of a molecule that is repelled from a mass of water. Hydrophobic molecules tend to be non-polar and thus prefer other neutral molecules and nonpolar solvents. Hydrophobic molecules in water often cluster together forming tiny bubble-like structures known as micelles.
The opposite of hydrophobic is hydrophilic.
A hydrophilic substance, from the Greek (hydros) “water” and philia “love,” …
Sep 29, 2005
Posted at 9:09 pm by David Bradley
Diethylstilbestrol (DES) is a synthetic nonsteroidal estrogen that was first synthesized in 1938. Human exposure to DES has allegedly occurred through diverse sources, such as dietary ingestion from supplemented cattle feed and medical treatment for certain conditions, including breast and prostate cancers.
From 1940 to 1970, DES was actually given to pregnant women in the belief that it would reduce the risk of pregnancy complications and losses. In 1971, DES was shown to cause a rare …
Posted at 5:02 pm by David Bradley
According to my good friend chemist Martyn Poliakoff, the principles of green chemistry should be as easy as A,B,C. Or, more precisely, PRODUCTIVELY. Poliakoff, who is Prof of Chemistry at Nottingham University and famed for his pioneering work with supercritical fluids (SCFs), PRODUCTIVELY spells out -
Prevent wastes
Renewable materials
Omit derivitization steps
Degradable chemical products
Use safe synthetic methods
Catalytic reagents
Temperature, pressure ambient
In-process monitoring
Very few auxiliary substances
E-factor, maximize feed …
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