Thermoreversible gel lubricants through universal supramolecular assembly of a nonionic surfactant in a variety of base lubricating liquids.
Thermoreversible gel lubricants through universal supramolecular assembly of a nonionic surfactant in a variety of base lubricating liquids.
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DOI：
10.1021/am502832z
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发表时间：
2014-09
影响因子：
9.5
通讯作者：
Qiangliang Yu;Mingjin Fan;Dongmei Li;Zenghong Song;Meirong Cai;Feng Zhou;Wei-min Liu
中科院分区：
文献类型：
--
作者：
Qiangliang Yu;Mingjin Fan;Dongmei Li;Zenghong Song;Meirong Cai;Feng Zhou;Wei-min Liu
研究了一种新型热可逆凝胶润滑剂，该润滑剂是由低分子量有机胶凝剂（LMWG）在不同基础油中进行超分子组装而成。LMWG是一种具有极性头基和疏水尾基的非离子表面活性剂，其可以通过集体非共价分子间相互作用（H-键合、疏水相互作用）自组装以形成纤维结构并将基础油（矿物油、合成油和水）捕集在所形成的空腔中。凝胶润滑剂在加热和冷却时是完全热可逆的，并表现出触变特性。这使它们成为半固体润滑剂，但它们的行为像油。摩擦学试验结果表明，与不含胶凝剂的基础油相比，低分子量润滑油也能有效地降低摩擦副的摩擦磨损。预计凝胶润滑剂用于齿轮、滚动轴承等油润滑部件时，可有效避免基础油泄漏和蒸发损失，有利于长期运行和润滑失效。
The present paper investigates a new type of thermoreversible gel lubricant obtained by supramolecular assembly of low-molecular-weight organic gelator (LMWG) in different base oils. The LMWG is a nonionic surfactant with polar headgroup and hydrophobic tail that can self-assemble through collective noncovalent intermolecular interactions (H-bonding, hydrophobic interaction) to form fibrous structures and trap base oils (mineral oils, synthetic oils, and water) in the as-formed cavities. The gel lubricants are fully thermoreversible upon heating-up and cooling down and exhibit thixotropic characteristics. This makes them semisolid lubricants, but they behave like oils. The tribological test results disclosed that the LMWG could also effectively reduce friction and wear of sliding pairs compared with base oils without gelator. It is expected that when being used in oil-lubricated components, such as gear, rolling bearing, and so on, gel lubricant may effectively avoid base oil leak and evaporation loss and so is a benefit to operation and lubrication failure for a long time.