Controlling the macroscopic liquid-like behaviour of halloysite-based solvent-free nanofluids via a facile core pretreatment
Controlling the macroscopic liquid-like behaviour of halloysite-based solvent-free nanofluids via a facile core pretreatment
复制标题
控制埃洛石基无溶剂纳米流体的宏观液体行为
DOI：
10.1016/j.clay.2018.01.037
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发表时间：
2018-05-01
影响因子：
5.6
通讯作者：
Zhong, Xuemin
中科院分区：
文献类型：
--
作者：
Du, Peixin;Liu, Dong;Zhong, Xuemin
尽管许多研究集中在基于不同纳米材料的无溶剂纳米流体的制备、表征和潜在应用上，但很少有研究集中在如何控制无溶剂纳米流体的宏观液体样行为上。本研究制备了一种埃洛石基无溶剂纳米流体，并开发了一种通过在不同温度下预热埃洛石（Hal）来调节该纳米流体流动性的简便方法。探讨了预热对埃洛石结构和表面官能团的影响，进而对所得纳米流体流动性的影响。在110摄氏度下加热Hal导致其表面官能部分几乎没有变化，并且所获得的纳米流体（Hal（110）-F）在室温下与Hal-F相比没有表现出明显不同的流动性，尽管Hal-F和Hal（110）-F具有不同的熔融温度并且在较低温度下表现出不同的流动性。而对于在700 ℃下加热的Hal，由于Hal（700）的表面官能部分的种类/量的显著煅烧诱导的变化，相应的纳米流体（Hal（700）-F）表现出比Hal-F和Hal（110）-F更低的流动性。这种通过简单的核预处理来控制纳米流体流动性的方法被认为对于大多数（如果不是全部）无溶剂纳米流体是通用的。
Despite the focus of many studies on the preparation, characterization, and potential applications of solvent-free nanofluids based on diverse nanomaterials, fewer studies have focused on how to control the macroscopic liquid-like behaviour of solvent-free nanofluids. The present study prepared a halloysite-based solvent-free nanofluid and developed a facile method of tuning the fluidity of this nanofluid by preheating halloysite (Hal) at different temperatures. The effects of preheating on the structure and surface functional groups of halloysite and further on the fluidity of the obtained nanofluids were explored. Heating Hal at 110 degrees C resulted in little changes to its surface functional moieties, and the obtained nanofluid (Hal(110)-F) did not exhibit a markedly different fluidity compared with Hal-F at room temperature, though Hal-F and Hal(110)-F had different melting temperatures and exhibited different fluidities at a lower temperature. While for Hal heated at 700 degrees C, the corresponding nanofluid (Hal(700)-F) exhibited a lower fluidity than Hal-F and Hal(110)-F due to the remarkable calcination-induced changes in the species/amount of surface functional moieties of Hal(700). This method for controlling the fluidity of the nanofluids via a facile core pretreatment was believed to be versatile for most, if not all, solvent-free nanofluids.