يناير 4th, 2014
Symbol θ. The unique temperature at which the attractions and repulsions of a polymer in a solution cancel each other. It is analogous to the Boyle temperature of a nonideal gas. A polymer solution at the Flory temperature is called a theta (θ) solution. At the Flory temperature the virial coefficient B, associated with the excuded volume of the polymer, is zero, which results in the polymer chain…
كلمات دليلية: Flory temperature
A type of ionic crystal structure in which the cations have an expanded face-centered cubic arrangement with the anions occupying both types of tetrahedral hole. The cations have a coordination number of 8 and the anions have a coordination number of 4. Examples of compounds with this structure are CaF2, BaCl2, and PbO2.
The antifluorite structure is the opposite arrangement, with anions in the fcc array with coordination…
كلمات دليلية: fluorite structure
A benzodiazepine used medically in some countries as a powerful hypnotic, sedative, and muscle relaxant. It was marketed in the US under the trade name Rohypnol. Flunitrazepam has become notorious as a so-called ‘date rape’ drug. It is quickly eliminated from the body, difficult to detect, and causes amnesia, so that victims cannot remember events that occur when under the influence of the drug.
كلمات دليلية: flunitrazepam