如同先前报道的液态聚合物一样,298.15 K时一般小分子液体的内压平方根l与摩尔体积Vm的乘积亦正比于它们的van der Waals体积Vvdw,而且两者有相同的比例系数。这说明各种液体的lVm具有相同的基团加和性。据此,利用它们的内压和摩尔体积...如同先前报道的液态聚合物一样,298.15 K时一般小分子液体的内压平方根l与摩尔体积Vm的乘积亦正比于它们的van der Waals体积Vvdw,而且两者有相同的比例系数。这说明各种液体的lVm具有相同的基团加和性。据此,利用它们的内压和摩尔体积的实验值建立了一个lVm的基团贡献法,它能用来预测各种液态有机物,包括聚合物在298.15 K时的内压值。本法不仅适用于非极性和弱极性液体,而且也适用于强极性和缔合液体。熟知的Small溶解度参数基团贡献法只不过是本工作的一个特例。对120种有机液体和液态聚合物的l值预测结果表明,其与实验值的一致性令人满意。展开更多
The magnetic properties and microstructure of triple C/CoCrTa/Ti perpendicular recording films have been studied. Magnetic measurements show that the optimal thickness of Ti underlayer is 4Ohm and that of CoCrTa is 35...The magnetic properties and microstructure of triple C/CoCrTa/Ti perpendicular recording films have been studied. Magnetic measurements show that the optimal thickness of Ti underlayer is 4Ohm and that of CoCrTa is 35 nm. The optimal value of substrate temperature is found to be 400℃. A suitable Ti underlayer causes a magnetic layer to have a near-perfect hcp texture, with Co grains in the （002） preferred orientation. The film with needle-like grains is more suitable for perpendicular recording films.展开更多
文摘如同先前报道的液态聚合物一样,298.15 K时一般小分子液体的内压平方根l与摩尔体积Vm的乘积亦正比于它们的van der Waals体积Vvdw,而且两者有相同的比例系数。这说明各种液体的lVm具有相同的基团加和性。据此,利用它们的内压和摩尔体积的实验值建立了一个lVm的基团贡献法,它能用来预测各种液态有机物,包括聚合物在298.15 K时的内压值。本法不仅适用于非极性和弱极性液体,而且也适用于强极性和缔合液体。熟知的Small溶解度参数基团贡献法只不过是本工作的一个特例。对120种有机液体和液态聚合物的l值预测结果表明,其与实验值的一致性令人满意。
基金Supported by the National Natural Science Foundation of China under Grant No 10274018, the Hebei Normal University Doctoral Fund （No L2003B08）, and the Natural Science Foundation of Hebei Province under Grant No E2005000178.
文摘The magnetic properties and microstructure of triple C/CoCrTa/Ti perpendicular recording films have been studied. Magnetic measurements show that the optimal thickness of Ti underlayer is 4Ohm and that of CoCrTa is 35 nm. The optimal value of substrate temperature is found to be 400℃. A suitable Ti underlayer causes a magnetic layer to have a near-perfect hcp texture, with Co grains in the （002） preferred orientation. The film with needle-like grains is more suitable for perpendicular recording films.
