Publications by authors named "Yufang Ren"

To overcome the poor antibacterial performance of cerium oxide (CeO) nanoparticles at low concentrations, melon seed-shaped CeO (MS-CeO) and holmium (Ho)-doped CeO (Ho@MS-CeO) nanoparticles were synthesized using a simple precipitation method without the addition of any surfactants. The surface morphology, phase structure, crystallinity, Ce and Ce valence, lattice defects, and reactive oxygen species (ROS) production of both synthesized nanostructures were examined using different techniques, i.e.

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The multifunction antibacterial hemostatic materials can reduce blood loss, infection and wound complications, which probably decrease morbidity and health care costs. However, the contradictory relationship between antibacterial ability and biocompatibility, and the unnecessary blood loss restricts the practical application of hydrophilic cationic antibacterial hemostatic materials. Herein, a multifunctional temperature-triggered antibacterial hemostatic fluorocopolymer aggregate coating was developed.

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Due to their various applications in human healthcare and industrial fields, engineering surfaces with antiadhesion and antibacteria properties is still a challenging task. In this work, the fluoropolymer with low surface energy and poly(poly(ethylene glycol) methyl ether methacrylate) (PEGMA) with electrostatic repulsion and interfacial hydration was chosen as a common antiadhesion block and quaternary ammonium salt with bactericide properties as a sterilization block. The triblock copolymers of poly(2-(dimethylamino)ethyl methacrylate)--poly(poly(oligo ethylene glycol) methyl ether methacrylate)--poly(dodecafluoroheptyl methacrylate) (PDMAEMA--PEGMA--PDFHMA) were synthesized by the reversible addition-fragmentation chain transfer (RAFT) polymerization method.

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Inhibiting the attachment of bacteria and the formation of biofilms on surfaces of materials and devices is the key to ensure public safety and is also the focus of attention and research. Here we report on the synthesis of multifunctional antibacterial materials based on water dispersible random copolymers containing a fluorinated block, poly(acrylic acid---perfluorododecyl acrylate) (PAA--PFDA), and poly(hexamethylene biguanide) hydrochloride (PHMB). PAA--PFDA copolymers were synthesized through a simple free radical polymerization.

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The diverse morphologies of aggregates formed by the self-assembly of block copolymers in selective solvents have attracted widespread attention, but the design of aggregate shapes is still limited owing to the thermodynamic favorability of sphere formation. In this paper, we report our discovery that polyhedral aggregates can be formed by the self-assembly of 1H,1H,2H,2H-perfluoro-1-dodecanol (PFD)-grafted amphiphilic polystyrene-b-poly(acrylic acid) (PS-b-PAA-g-PFD) copolymers in water at room temperature. It is determined that the crystallization of fluorocarbon side chains at the surface of PS-b-PAA-g-PFD aggregates induces the formation of a polyhedral shape.

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Recently, although several unconventional luminescent polymers have been synthesized, it still remains a significant challenge to prepare various new fluorescent polymers by functionalization of nonfluorescent polymers. A nonfluorescent 1 H,1 H,2 H,2 H-perfluoro-1-decanol grafted to nonfluorescent polystyrene- b-poly(acrylic acid) block copolymers through simply esterification reaction can exhibit strong blue emission. On the basis of control experiments and theoretical simulation, we have proposed that the luminescence stems from interchain n → π* interaction between the lone pair (n) of hydroxyl O atoms of carboxyl units and empty π* orbital of ester carbonyl unit.

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