Water Adsorption on Thin Film Media.
Water Adsorption on Thin Film Media.
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薄膜介质上的水吸附。
DOI：
10.1006/jcis.2000.6745
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发表时间：
2000
影响因子：
9.9
通讯作者：
Karis
中科院分区：
文献类型：
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作者：
Karis
磁盘驱动器在存储和操作过程中会经历各种温度和湿度。湿度通过吸附水对 Zdol 润滑剂羟基端基与碳涂层相互作用的影响来影响介质摩擦学。我们测量了 Zdol 4000 厚度和化学吸附对水吸附等温线和表面能的影响。采用 Adamson 的潜在畸变模型从等温线和接触角推导出饱和时的膜厚度。令人惊讶的是，等温线与Zdol化学吸附和厚度高达1.8 nm无关，因为在这个Zdol厚度范围内，吸附的水驻留在排除较大Zdol端基的孔中。由于水能够到达 Zdol 无法到达的外涂层中的孔，因此水吸附等温线提供了外涂层结构的灵敏探针。当 Zdol 厚度超过 1.8 nm 时，水吸附会发生跳跃，因为“游离”羟基上会发生额外的吸附。先前观察到的 Zdol 润滑介质在低湿度下耐久性下降的机制源自吸附水对 Zdol 表面扩散和化学吸附的影响。版权所有 2000 学术出版社。
Disk drives experience a wide range of temperature and humidity during storage and operation. Humidity influences media tribology through the effects of adsorbed water on the interaction of Zdol lubricant hydroxyl end groups with the carbon overcoat. We measured the effects of Zdol 4000 thickness and chemisorption on the water adsorption isotherm and surface energy. The potential distortion model of Adamson was employed to derive the film thickness at saturation from the isotherms and contact angles. The isotherm was surprisingly independent of the Zdol chemisorption and thickness up to 1.8 nm, because, in this range of Zdol thickness, the adsorbed water resides in pores which exclude the larger Zdol end groups. The water adsorption isotherm provides a sensitive probe of overcoat structure due the ability of water to reach pores in the overcoat which are inaccessible to Zdol. Above a Zdol thickness of 1.8 nm there is a jump in the water adsorption as additional adsorption takes place on the "free" hydroxyl groups. The mechanism for the previously observed decrease in Zdol lubricated media durability at low humidity is derived from the effect of adsorbed water on Zdol surface diffusion and chemisorption. Copyright 2000 Academic Press.
W.Gasser：“二氧化硅的准单层沉积”固体薄膜。
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