Microfluidic-SANS: flow processing of complex fluids.

Microfluidic-SANS: flow processing of complex fluids.
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DOI:
10.1038/srep07727
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发表时间:
2015-01-12
期刊:
影响因子:
4.6
通讯作者:
Cabral JT
Cabral JT
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Lopez CG;Watanabe T;Martel A;Porcar L;Cabral JT

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在分子水平上理解和设计复杂和非牛顿流体的流动响应是其实际应用的关键挑战。在这里,我们演示了微流体与小角中子散射(SANS)的耦合。通过正面光聚合可快速制作具有高中子透射率(高达 98%)、低散射背景 ()、广泛的溶剂兼容性和高压耐受性 (≈3–15 bar) 的微型器件原型。在散射矢量范围 0.01–0.3 Å−1 内成功获得了宽度低至 60 μm 的单个微通道的散射,光束足迹直径为 500 μm,对应于实际空间尺寸 。我们通过研究支持两种模型复杂流体(即十六烷基三甲基氯化铵/戊醇/D2O 和十二烷基硫酸钠/辛醇/盐水层状系统)的流动响应的分子重新定向和排列来展示我们的方法。最后,我们评估了微流控 SANS 在高通量和流动处理研究中的适用性和前景,重点是软物质。
Understanding and engineering the flow-response of complex and non-Newtonian fluids at a molecular level is a key challenge for their practical utilisation. Here we demonstrate the coupling of microfluidics with small angle neutron scattering (SANS). Microdevices with high neutron transmission (up to 98%), low scattering background (), broad solvent compatibility and high pressure tolerance (≈3–15 bar) are rapidly prototyped via frontal photo polymerisation. Scattering from single microchannels of widths down to 60 μm, with beam footprint of 500 μm diameter, was successfully obtained in the scattering vector range 0.01–0.3 Å−1, corresponding to real space dimensions of . We demonstrate our approach by investigating the molecular re-orientation and alignment underpinning the flow response of two model complex fluids, namely cetyl trimethylammonium chloride/pentanol/D2O and sodium lauryl sulfate/octanol/brine lamellar systems. Finally, we assess the applicability and outlook of microfluidic-SANS for high-throughput and flow processing studies, with emphasis of soft matter.
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