Controlling Surfactant Adsorption on Highly Charged Nanoparticles to Stabilize Bijels
Controlling Surfactant Adsorption on Highly Charged Nanoparticles to Stabilize Bijels
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DOI：
10.1021/acs.jpcc.0c01440
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发表时间：
2020-06-11
影响因子：
3.7
通讯作者：
Haase, Martin F.
中科院分区：
文献类型：
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作者：
Boakye-Ansah, Stephen;Khan, Mohd Azeem;Haase, Martin F.
双连续颗粒稳定乳液（Bijels）是互穿油/水通道的网络，其在催化、组织工程和能量储存中具有应用。Bijels可以通过经由纳米颗粒的界面堵塞阻止溶剂转移诱导的相分离（STrIPS）来产生。然而，到目前为止，STrIPS Bijels仅由低表面电荷密度的二氧化硅纳米颗粒形成，限制了它们在催化和流体输送中的潜在应用。在这里，我们展示了如何强烈带电的二氧化硅纳米粒子可以稳定bijels。为此，我们采用动态光散射、zeta电位、酸/碱滴定、比浊法、表面张力和共聚焦显微镜进行了系统的研究。我们发现，缓和带相反电荷的表面活性剂在颗粒上的吸附是至关重要的，以促进颗粒在bijel铸造混合物和bijel稳定。我们的研究结果可能会引入一个一般的理解，用不同的无机纳米粒子材料的可变电荷密度的Bijel制造。
Bicontinuous particle-stabilized emulsions (bijels) are networks of interpenetrating oil/water channels with applications in catalysis, tissue engineering, and energy storage. Bijels can be generated by arresting solvent transfer induced phase separation (STrIPS) via interfacial jamming of nanoparticles. However, until now, STrIPS bijels have only been formed with silica nanoparticles of low surface charge densities, limiting their potential applications in catalysis and fluid transport. Here, we show how strongly charged silica nanoparticles can stabilize bijels. To this end, we carry out a systematic study employing dynamic light scattering, zeta potential, acid/base titrations, turbidimetry, surface tension, and confocal microscopy. We find that moderating the adsorption of oppositely charged surfactants on the particles is crucial to facilitate particle dispersibility in the bijel casting mixture and bijel stabilization. Our results potentially introduce a general understanding for bijel fabrication with different inorganic nanoparticle materials of variable charge density.