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Amphiphilic hyperbranched polymers (Hx-PEI-PEG) with polyethylene glycol (PEG) chains and low-molecular-weight polyethylenimine (PEI) conjugated to commercial aliphatic hyperbranched polyesters (Boltorn Hx) were used to stabilize gold nanoparticles (AuNPs) at the interlayer between the core and the shell. It was found that low generations of Hx-PEI-PEG such as H20-PEI-PEG and H30-PEI-PEG cannot effectively...
Heterogeneous 9-thiourea epiquinine catalysts are prepared by covalently anchoring 9-(3,5-bis(trifluoromethyl)phenylthiourea)epiquinine on mesoporous silica surfaces via mercapto linker. It is found that 9-thiourea epiquinine moieties are located comparably on the interior and exterior surfaces of SBA-15 while preferentially on the exterior surface of MCM-41. The heterogeneous 9-thiourea epiquinine...
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