Ion shuttling between emulsion droplets by crown ether modified gold nanoparticles.
Ion shuttling between emulsion droplets by crown ether modified gold nanoparticles.
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DOI：
10.1039/d1na00009h
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发表时间：
2021-04-09
影响因子：
4.7
通讯作者：
Brust M
中科院分区：
文献类型：
--
作者：
Kunstmann-Olsen C;Belić D;Bradley DF;Danks SP;Diaz Fernandez YA;Grzelczak MP;Hill AP;Qiao X;Raval R;Sorzabal-Bellido I;Brust M
证明了钡离子在氯仿包水乳液中的液滴之间的选择性单向传输。用硫醇冠醚修饰的金纳米粒子 (GNP) 充当钡离子络合梭，将离子从一组液滴（源）运送到另一组液滴（目标）。该过程是由源液滴和目标液滴之间陡峭的钡离子浓度梯度驱动的。通过不溶性硫酸钡的沉淀，目标液滴中的钡离子浓度始终保持较低水平。讨论了维持乳液液滴电中性的静电耦合二次过程的潜在作用。在 Fe(ii)/Fe(iii) 氧化还原电对存在下，通过电子转移对 GNP 金属核充电似乎会影响 GNP 在水滴和氯仿相之间的分配。通过光学显微镜、拉曼光谱、低温扫描电子显微镜 (cryo-SEM) 和 zeta 电位对过程进行了监测和研究。 GNP 的穿梭作用已在模型系统中通过电化学得到进一步证明。冠醚修饰的金纳米粒子充当水滴之间的电荷传输体。这种连续非平衡过程的热力学驱动力是 BaSO4 在一群液滴中的沉淀。
Selective unidirectional transport of barium ions between droplets in a water-in-chloroform emulsion is demonstrated. Gold nanoparticles (GNPs) modified with a thiolated crown ether act as barium ion complexing shuttles that carry the ions from one population of droplets (source) to another (target). This process is driven by a steep barium ion concentration gradient between source and target droplets. The concentration of barium ions in the target droplets is kept low at all times by the precipitation of insoluble barium sulfate. A potential role of electrostatically coupled secondary processes that maintain the electroneutrality of the emulsion droplets is discussed. Charging of the GNP metal cores by electron transfer in the presence of the Fe(ii)/Fe(iii) redox couple appears to affect the partitioning of the GNPs between the water droplets and the chloroform phase. Processes have been monitored and studied by optical microscopy, Raman spectroscopy, cryogenic scanning electron microscopy (cryo-SEM) and zeta potential. The shuttle action of the GNPs has further been demonstrated electrochemically in a model system. Crown-ether modified gold nanoparticles act as charge transporters between aqueous droplets. The thermodynamic driving force for this continuous non-equilibrium process is precipitation of BaSO4 in one population of droplets.
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影响因子：
--
作者：
Bayley H;Cronin B;Heron A;Holden MA;Hwang WL;Syeda R;Thompson J;Wallace M
通讯作者：
Wallace M
影响因子：
16.6
作者：
Bodnarchuk MI;Yakunin S;Piveteau L;Kovalenko MV
通讯作者：
Kovalenko MV
影响因子：
56.9
作者：
Erbas-Cakmak, Sundus;Fielden, Stephen D. P.;Wilson, Miriam R.
通讯作者：
Wilson, Miriam R.
影响因子：
3.9
作者：
Im, Do Jin;Ahn, Myung Mo;Kang, In Seok
通讯作者：
Kang, In Seok
影响因子：
17.1
作者：
Grzelczak MP;Danks SP;Klipp RC;Belic D;Zaulet A;Kunstmann-Olsen C;Bradley DF;Tsukuda T;Viñas C;Teixidor F;Abramson JJ;Brust M
通讯作者：
Brust M