2 research outputs found
Metalloporphyrin-based porous polymers prepared via click chemistry for size-selective adsorption of protein
<p>Zinc porphyrin-based porous polymers (PPs-Zn) with different pore sizes were prepared by controlling the reaction condition of click chemistry, and the protein adsorption in PPs-Zn and the catalytic activity of immobilized enzyme were investigated. PPs-Zn-1 with 18Â nm and PPS-Zn-2 with 90Â nm of pore size were characterized by FTIR, NMR and nitrogen absorption experiments. The amount of adsorbed protein in PPs-Zn-1 was more than that in PPs-Zn-2 for small size proteins, such as lysozyme, lipase and bovine serum albumin (BSA). And for large size proteins including myosin and human fibrinogen (HFg), the amount of adsorbed protein in PPs-Zn-1 was less than that in PPs-Zn-2. The result indicates that the protein adsorption is size-selective in PPs-Zn. Both the protein size and the pore size have a significant effect on the amount of adsorbed protein in the PPs-Zn. Lipase and lysozyme immobilized in PPs-Zn exhibited excellent reuse stability.</p
Factors that Affect Pickering Emulsions Stabilized by Graphene Oxide
Stable
Pickering emulsions were prepared using only graphene oxide
(GO) as a stabilizer, and the effects of the type of oil, the sonication
time, the GO concentration, the oil/water ratio, and the pH value
on the stability, type, and morphology of these emulsions were investigated.
In addition, the effects of salt and the extent of GO reduction on
emulsion formation and stability were studied and discussed. The average
droplet size decreased with sonication time and with GO concentration,
and the emulsions tended to achieve good stability at intermediate
oil/water ratios and at low pH values. In all solvents, the emulsions
were of the oil-in-water type, but interestingly, some water-in-oil-in-water
(w/o/w) multiple emulsion droplets were also observed with low GO
concentrations, low pH values, high oil/water ratios, high salt concentrations,
or moderately reduced GO in the benzyl chloride–water system.
A Pickering emulsion stabilized by Ag/GO was also prepared, and its
catalytic performance for the reduction of 4-nitrophenol was investigated.
This research paves the way for the fabrication of graphene-based
functional materials with novel nanostructures and microstructures