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Abstract: Four different surface fractal dimensions (Dsf's) of anisotropic silica (SiO2-x) similar in size were synthesized by layer-by-layer molecular imprinting strategy. Grafting was confirmed by FT-IR and X-ray photoelectron spectroscopy. The surface and interfacial properties of particles were confirmed by transmission electron microscopy, nitrogen adsorption, dynamic light scattering, and contact-angle measurement. Results showed that Dsf 's of SiO2-1, SiO2-2, SiO2-4, and SiO2-6, were 2.47, 2.55, 2.62, and 2.56, respectively. Moreover, the modified silica shape varied from spherical to anisotropic particle, and particle hydrophobicity decreased with increased the Dsf. Stable emulsions were prepared by these particles. The effects of particle concentration, hydrophobicity, and Dsf on the formation, stability, and rheology of emulsions were investigated using an optical microscopy and rheometer. Optical microscopy images showed that unmodified silica failed to form stabilized emulsions due to excellent hydrophility, and particles with Dsf = 2.62 and 0.2 wt% concentration were the best for stabilized emulsions. Moreover, increased Dsf led to decreased droplets size smaller and easier network formation. Rheology measurement further showed that increased Dsf led to increased viscoelasticity and thermal stability of emulsions due to the formation of rigid volume-filling networks. This finding indicated that the particle fractal structure strongly affected the structures in the suspension to immobilize the emulsion droplets in these networks. Emulsion also exhibited longer λ-cyhalothrin release speed with increasing Dsf using λ-cyhalothrin as model hydrophobic drug. The λ-cyhalothrin release kinetics well-fitted the Weibull model
Template and target information: λ-cyhalothrin
Author keywords: Anisotropic particle, Layer-by-layer molecular imprinting, Fractal dimension, Pickering emulsion, Rheology, release