Another face to Janus particles: Silica Janus nanosheets were synthesized by crushing Janus hollow spheres formed by self‐assembled materialization of an amphiphilic emulsion interface. The Janus nanosheets serve as solid surfactants and can be used collecting oil or hazardous chemical spills.
We have proposed a simple method to synthesize asymmetric Janus polymer particles at an emulsion interface. Morphological evolution of the particles with polymerization and their dependence on some key variables reveal that both cross-linking degree of the particles and interfacial tension difference play key roles in achieving the asymmetric shapes. By selective growth of functional materials onto the desired sides, composition and microstructure of the Janus particles can be controlled. The representative PS/PAM Janus particles are amphiphilic and can be used as solid surfactants to stabilize emulsions, which preferentially orientate at the interface.
Another face to Janus particles: Silica Janus nanosheets were synthesized by crushing Janus hollow spheres formed by self‐assembled materialization of an amphiphilic emulsion interface. The Janus nanosheets serve as solid surfactants and can be used collecting oil or hazardous chemical spills.
Graphitic porous carbons were prepared by adding FeCl3 into a preliminary water-soluble mixture of poly(vinyl alcohol) and magnesium acetate, followed by carbonization and acid washing. The samples were then characterized by X-ray diffraction (XRD) and N2 adsorption at 77 K. XRD patterns showed that Fe could accelerate carbon graphitization at 1000 °C. Although the MgO particles worked as template, they resulted in the decrease of crystallinity. Thus it is necessary to balance between crystallinity and pore structures for diversified applications.
Silylation, also known as silane grafting, is frequently used to organically modify montmorillonite (organo-Mt), which of properties were depended on the type of siloxane and intercalated interlayer structure of Mt, for construction of functional materials utilizing in a variety application of industry. We have synthesized organo-Mt using different siloxanes after Mt was firstly modified at three different surfactants of cationic cetyltrimethylammonium bromide (CTAB), anionic sodium oleate (So) and nonionic sorbitan monostearate (Span60) to identifying the effect of surfactants for silylation of Mt. The spectral and structural characters of the obtained products were characterized by a combination of X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), thermogravimetry (TG), and contact angle analysis. The basal spacing of the organo-Mt increased with surfactants loading. We found that CTAB can significantly increase the spacing between layers of Mt from 1.55nm to 1.90nm, load more siloxane on Mt. The average contact angles of CTAB-Mt-APTES and CTAB-Mt-PTES were 69.9±0.3° and 80.7±0.3°, which could be more prone to the interlayer locking effect. Our study showed that the charge of surfactants has significant influence for silylation of Mt, resulting in the loading amount of silane, interlayer structure, and the surface wetting properties.
Amphiphilic functionalized montmorillonite (MMT) has been employed in hydrophobic compounds delivery systems. In the present study, MMT intercalated by 3-aminopropyl trimethoxysilane (APS) was employed for the delivery of the model compounds of resveratrol (RSV). The structure and surface morphology of APS-MMT were characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, thermogravimetry, scanning electron microscopy, and contact angle analysis. The loading and release efficiencies of RSV were also investigated. Our study showed that the aminosilane-modified MMT is promising for use in poorly water-soluble compounds carrier systems owing to their natural and excellent performance.
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