To raise the adsorption capacity of the adsorptive fiber for strontium ions in seawater, sodium titanium silicate was impregnated onto an anion-exchange fiber. Peroxotitanium complex anions were immobilized onto N, N-dimethylaminopropylacrylamide（DMAPAA）-grafted nylon-6 fiber, followed by a reaction with sodium orthosilicate. The resultant fiber exhibited a strontium removal percentage of 83 ％ and a selectivity of Sr to Ca of 4.3 in artificial seawater, which were 1.1- and two-fold, respectively, higher than those of the sodium-titanate-impregnated fiber.
In the presence of AgI crystals, three types of water, i.e., water, a 50 ％v/v water/heavy water mixture, and heavy water, were cooled to －3.0 ℃ without stirring. Their order in terms of their freezing points was water＜the mixture＜heavy water. In the absence of AgI crystals, none of these three types of water was frozen under identical conditions; therefore, the presence of AgI crystals reduced supercooling. The observed difference between the freezing points of water and heavy water in the presence of AgI crystals was 4.0 ℃.