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首页> 外文期刊>RSC Advances >Nano-demixing as a novel strategy for magnetic field responsive systems: the case of dibutyl phosphate/bis(2-ethylhexyl) amine systems
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Nano-demixing as a novel strategy for magnetic field responsive systems: the case of dibutyl phosphate/bis(2-ethylhexyl) amine systems

机译：纳米消磁作为磁场响应系统的新策略：磷酸二丁酯/双（2-乙基己基）胺系统

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摘要

Pure surfactant liquids and their binary mixtures, owing to the amphiphilic nature of the molecules involved, can exhibit nano-segregation and peculiar transport properties. The possibility of opportunely choosing the amphiphiles should lead to the formation of anisotropic aggregates that can be oriented by an external factor like a magnetic field. In this case some properties, like optical birefringence, can be induced by the use of a magnetic field. Dynamic features of dibutyl phosphate (DBP)/bis(2-ethylhexyl) amine (BEEA) mixtures have been investigated by FT-IR, NMR, rheometry, Brillouin scattering, and magneticallyinduced birefringence measurements as a function of the BEEA mole fraction (X). It turns out that BEEA/DBP liquid mixtures, driven by H-bond formation, show zero-threshold percolating self-assembly with a maximum in viscosity and a minimum in molecular diffusion at 1 : 1 composition. Interestingly, it has been highlighted that nano-segregation takes place at X congruent to 0.7 with the formation of DBP-rich closed local structures that are fully-responsive to an external magnetic field, rendering the system birefringent. It is worth noting that this is the first observation of amphiphile-based micelles in amphiphilic medium. The analysis of all the experimental data consistently pointed out the microscopic factors involved in this peculiar phenomenon and in particular emphasized the role of specific polar and apolar interactions along with to steric effects in regulating the molecular organization in surfactant mixtures. This report presents novel clear, stable and anhydrous systems, fully responsive to a magnetic field with tunable optical birefringence, and opens new trends in the directed design of water-free optically-active fluids.
机译：由于所涉及分子的两亲性，纯净的表面活性剂液体及其二元混合物可表现出纳米分离和特殊的传输特性。巧的选择两亲物的可能性，应导致可以由像一个磁场的外部因素被定向各向异性聚集体的形成。在这种情况下，可以通过使用磁场来诱发某些特性，例如光学双折射。磷酸二丁酯（DBP）/双（2-乙基己基）胺（BEEA）混合物的动态特性已通过FT-IR，NMR，流变仪，布里渊散射和磁感应双折射测量作为BEEA摩尔分数（X）的函数进行了研究。事实证明，由H键形成驱动的BEEA / DBP液体混合物显示出零阈值渗透自组装，在1：1组成下粘度最大，分子扩散最小。有趣的是，已经强调出，纳米分离发生在X等于0.7处，形成了对外部磁场完全响应的富含DBP的封闭局部结构，从而使系统具有双折射性。值得注意的是，这是两亲性介质中基于两亲性胶束的首次观察。对所有实验数据的分析一致地指出了这种特殊现象所涉及的微观因素，并特别强调了特定极性和非极性相互作用以及空间位阻在调节表面活性剂混合物中分子组织方面的作用。这份报告提出了新颖的透明，稳定和无水的系统，该系统完全响应具有可调光学双折射的磁场，并开启了无水光学活性流体定向设计的新趋势。

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