Synthesis and aggregation behavior of hybrid amphiphilic titania Janus nanoparticles via surface-functionalization in Pickering emulsions
Synthesis and aggregation behavior of hybrid amphiphilic titania Janus nanoparticles via surface-functionalization in Pickering emulsions
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DOI：
10.1016/j.colsurfa.2014.07.039
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发表时间：
2014-11
期刊：
影响因子：
--
通讯作者：
N. Zahn;G. Kickelbick
中科院分区：
文献类型：
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作者：
N. Zahn;G. Kickelbick
在Pickering乳液中加入疏水或亲水的膦酸酯锚基，制备了两亲性表面功能化的二氧化钛纳米粒子。皮克林乳液方法允许形成具有高度表面官能化的各向异性纳米颗粒，其模拟表面活性剂的行为。因此，研究了所形成的颗粒在稳定乳液中的效率，并且可以表明，通过添加两亲性颗粒，乳液的稳定性显著增加。由于纳米粒子的光催化活性，乳液对分层的稳定性可以通过用UV光照射而降低。通过电导率测量确定了两亲性改性纳米颗粒悬浮液的临界胶束浓度（CMC）。所制备的表面功能化纳米粒子显示出与两亲性嵌段共聚物相似的特性。
Amphiphilic surface-functionalized titania nanoparticles were prepared in a Pickering emulsion applying hydrophobic or hydrophilic agents containing a phosphonate anchor group. The Pickering emulsion approach allows for the formation of anisotropic nanoparticles with a high degree of surface-functionalization that mimic the behavior of surfactants. Therefore, the efficiency of the formed particles in stabilizing emulsions was studied and it could be shown that the stability of emulsions substantially increases by addition of amphiphilic particles. Due to the photocatalytic activity of anatase nanoparticles the emulsions stability against creaming can be decreased by irradiation with UV light. The critical micelle concentration (CMC) of suspensions of amphiphilically modified nanoparticles was determined by conductivity measurements. The prepared surface-functionalized nanoparticles show similar characteristics as amphiphilic block copolymers.