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Absorbent-Adsorbates: Large Amphiphilic Janus Microgels as Droplet Stabilizers.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-06-29 , DOI: 10.1021/acsami.0c11408 Bobby Haney 1 , Jörg G Werner 2 , David A Weitz , Subramanian Ramakrishnan 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-06-29 , DOI: 10.1021/acsami.0c11408 Bobby Haney 1 , Jörg G Werner 2 , David A Weitz , Subramanian Ramakrishnan 1
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Microgel particles are cross-linked polymer networks that absorb certain liquids causing network expansion. The type of swelling fluid and extent of volume change depends on the polymer–liquid interaction and the network’s cross-link density. These colloidal gels can be used to stabilize emulsion drops by adsorbing to the interface of two immiscible fluids. However, to enhance the adsorption abilities of these predominantly hydrophilic gel particles, some degree of hydrophobicity is needed. An amphiphilic Janus microgel with spatially distinct lipophilic and hydrophilic sides is desired. Here, we report the fabrication of poly(ethylene glycol) diacrylate/poly(propylene glycol) diacrylate Janus microgels (JM) using microfluidic drop making. The flow streams of the two separate and immiscible monomer solutions are brought into contact and intersected by a third immiscible fluid in a flow-focusing junction to form Janus droplets. The individual droplets are cross-linked via UV irradiation to form monodispersed microgel particles with opposing hydrophilic and hydrophobic 3D-networked polymer matrices. By combining two chemically different polymer gel networks, an amphiphilic emulsion stabilizer is formed that adsorbs to the oil–water interface while its faces absorb their respective water or hydrocarbon solvents. The resulting water-in-oil emulsions are stabilized and destabilized via a thermal-responsive hydrogel. Stimuli-responsive droplets are demonstrated by adding a short-chain oligo ethylene glycol acrylate molecule to the hydrogel formulation on the Janus microgel particle. Droplets stabilized by these particles experience a sudden increase in droplet diameter around 60 °C. This work with absorbent particles may prove useful for applications in bio catalysis, fuel production, and oil transportation.
中文翻译：
吸收剂-吸附剂：大型两亲性Janus微凝胶，作为液滴稳定剂。
微凝胶颗粒是交联的聚合物网络，吸收某些液体导致网络膨胀。溶胀流体的类型和体积变化的程度取决于聚合物与液体之间的相互作用以及网络的交联密度。这些胶体凝胶可通过吸附到两种不混溶流体的界面来稳定乳液滴。然而，为了增强这些主要为亲水性的凝胶颗粒的吸附能力，需要一定程度的疏水性。需要具有在空间上不同的亲脂和亲水侧的两亲Janus微凝胶。在这里，我们报告使用微流滴制造聚（乙二醇）二丙烯酸酯/聚（丙二醇）二丙烯酸酯Janus微凝胶（JM）的制造。两种分离且不互溶的单体溶液的流在流动聚焦接合处与第三种不互溶的流体接触并相交以形成Janus液滴。各个液滴通过紫外线辐射交联，形成具有相对的亲水和疏水3D网络聚合物基质的单分散微凝胶颗粒。通过结合两种化学上不同的聚合物凝胶网络，可以形成两亲乳液稳定剂，该稳定剂吸附在油水界面上，而其表面则吸收各自的水或烃溶剂。所得的油包水乳状液通过热响应性水凝胶稳定和不稳定。通过在Janus微凝胶颗粒上的水凝胶制剂中添加短链寡聚乙二醇丙烯酸丙烯酸酯分子来证明刺激响应性液滴。被这些颗粒稳定的液滴的液滴直径在60°C左右突然增加。吸收剂颗粒的这项工作可能被证明可用于生物催化，燃料生产和石油运输。
更新日期：2020-07-22
中文翻译：
吸收剂-吸附剂：大型两亲性Janus微凝胶，作为液滴稳定剂。
微凝胶颗粒是交联的聚合物网络，吸收某些液体导致网络膨胀。溶胀流体的类型和体积变化的程度取决于聚合物与液体之间的相互作用以及网络的交联密度。这些胶体凝胶可通过吸附到两种不混溶流体的界面来稳定乳液滴。然而，为了增强这些主要为亲水性的凝胶颗粒的吸附能力，需要一定程度的疏水性。需要具有在空间上不同的亲脂和亲水侧的两亲Janus微凝胶。在这里，我们报告使用微流滴制造聚（乙二醇）二丙烯酸酯/聚（丙二醇）二丙烯酸酯Janus微凝胶（JM）的制造。两种分离且不互溶的单体溶液的流在流动聚焦接合处与第三种不互溶的流体接触并相交以形成Janus液滴。各个液滴通过紫外线辐射交联，形成具有相对的亲水和疏水3D网络聚合物基质的单分散微凝胶颗粒。通过结合两种化学上不同的聚合物凝胶网络，可以形成两亲乳液稳定剂，该稳定剂吸附在油水界面上，而其表面则吸收各自的水或烃溶剂。所得的油包水乳状液通过热响应性水凝胶稳定和不稳定。通过在Janus微凝胶颗粒上的水凝胶制剂中添加短链寡聚乙二醇丙烯酸丙烯酸酯分子来证明刺激响应性液滴。被这些颗粒稳定的液滴的液滴直径在60°C左右突然增加。吸收剂颗粒的这项工作可能被证明可用于生物催化，燃料生产和石油运输。
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