The effect of charge screening for cationic surfactants on the rigidity of interfacial nanoparticle assemblies

被引:1
|
作者
Siegel, Henrik [1 ]
de Ruiter, Mariska [1 ]
Niepa, Tagbo H. R. [2 ]
Haase, Martin F. [1 ]
机构
[1] Univ Utrecht, Debye Inst Nanomat Sci, Dept Chem, Vant Hoff Lab Phys & Colloid Chem, Utrecht, Netherlands
[2] Carnegie Mellon Univ, Coll Engn, Biomed Engn, Chem Engn, Pittsburgh, PA USA
基金
荷兰研究理事会;
关键词
Particles at interfaces; Surfactants; Pickering emulsions; Structured liquids; Bijels; Interfacial rheology; Interfacial tension; Ionic strength; Solvent transfer induced phase separation; STrIPS; EMULSIONS; STABILIZATION; MICROPARTICLES; FABRICATION; ADSORPTION; PARTICLES; INVERSION; MEMBRANES; DROPLETS; TENSION;
D O I
10.1016/j.jcis.2024.08.133
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Hypothesis: Functionalizing colloidal particles with oppositely charged surfactants is crucial for stabilizing emulsions, foams, all-liquid structures, and bijels. However, surfactants can reduce the attachment energy, the driving force for colloidal self-assembly at interfaces. An open question remains on how the inherent interfacial activity of cationic surfactants influences the interfacial rigidity of particle-laden interfaces. We hypothesize that charge screening among cationic surfactants regulates the rigidity of oil/water interfaces by reducing the attachment energy of nanoparticles. Experiments: We investigate the interfacial rigidity of cetyltrimethylammonium bromide (CTAB) functionalized silica nanoparticles (Ludox (R) TMA) by analyzing the shape deformation of 1,4-butanediol diacrylate (BDA) droplets under varying salt and alcohol concentrations. The nanoparticle packing density is assessed using scanning electron microscopy. Attachment energy is characterized through interfacial tension measurements, three-phase contact angle analysis, and CTAB adsorption studies. We also examine the effects of interfacial rigidities on the structure of bijel films formed via roll-to-roll solvent transfer-induced phase separation (R2RSTrIPS) using confocal laser scanning microscopy. Findings: Increasing salt and alcohol concentrations decrease the interfacial rigidity of CTAB-functionalized nanoparticle films by reducing the interfacial tension. The contact angle has a minor influence on the rigidity. These results indicate that CTAB charge screening weakens the nanoparticle attachment energy to the interface. Controlling the rigidity enables the mass production of bijel sheets with consistent flatness, which is crucial for their potential applications in catalysis, energy storage, tissue engineering, and filtration membranes.
引用
收藏
页码:201 / 208
页数:8
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