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Brush‐Like Polycarbonates Containing Dopamine,Cations, and PEG Providing a Broad‐Spectrum,Antibacterial, and Antifouling Surface via One‐Step Coating
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Robert J. Ono Haeshin Lee Li Yang Hsu Yen Wah Tong James Hedrick Yi Yan Yang 《Advanced materials (Deerfield Beach, Fla.)》2014,26(43):7346-7351
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Harihara S. Sundaram Xia Han Ann K. Nowinski Norman D. Brault Yuting Li Jean‐Rene Ella‐Menye Kagya A. Amoaka Keith E. Cook Patrick Marek Kris Senecal Shaoyi Jiang 《Advanced Materials Interfaces》2014,1(6)
It is highly desirable to develop a universal nonfouling coating via a simple one‐step dip‐coating method. Developing such a universal coating method for a hydrophilic polymer onto a variety of surfaces with hydrophobic and hydrophilic properties is very challenging. This work demonstrates a versatile and simple method to attach zwitterionic poly(carboxybetaine methacrylate) (PCB), one of the most hydrophilic polymers, onto both hydrophobic and hydrophilic surfaces to render them nonfouling. This is achieved by the coating of a catechol chain end carboxybetaine methacrylate polymer (DOPA‐PCB) assisted by dopamine. The coating process was carried out in water. Water miscible solvents such as methanol and tetrahydrofuran (THF) are added to the coatings if surface wettability is an issue, as for certain hydrophobic surfaces. This versatile coating method was applied to several types of surfaces such as polypropylene (PP), polydimethyl siloxane (PDMS), Teflon, polystyrene (PS), polymethylmethacrylate (PMMA), polyvinyl chloride (PVC) and also on metal oxides such as silicon dioxide. 相似文献
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目的以二氧化硅为核、聚甲基丙烯酸甲酯为刷制备球形高分子刷,考察其作为包装纸防潮涂料主要成膜物质的性能。方法采用"从表面接枝"技术,通过引发剂引发单体聚合生成甲基丙烯酸甲酯球形刷,利用FTIR和TEM对球形高分子刷的结构及形态进行表征,并考察其作为涂料成膜物质的应用性能。结果合成的球形高分子刷具有良好的耐水性能,且在固含量达到40%以上时仍具有较低的粘度(64 m Pa?s)。结论该球形高分子刷具有高固低粘包装纸防潮涂料的应用价值。 相似文献
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Green Fabrication of Amphiphilic Quaternized β‐Chitin Derivatives with Excellent Biocompatibility and Antibacterial Activities for Wound Healing
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Huan Xu Zehong Fang Weiqun Tian Yanfeng Wang Qifa Ye Lina Zhang Jie Cai 《Advanced materials (Deerfield Beach, Fla.)》2018,30(29)
Bacterial infection has always been a great threat to public health, and new antimicrobials to combat it are urgently needed. Here, a series of quaternized β‐chitin derivatives is prepared simply and homogeneously in an aqueous KOH/urea solution, which is a high‐efficiency, energy‐saving, and “green” route for the modification of chitin. The mild reaction conditions keep the acetamido groups of β‐chitin intact and introduce quaternary ammonium groups on the primary hydroxyl at the C‐6 position of the chitin backbone, allowing the quaternized β‐chitin derivatives (QCs) to easily form micelles. These QCs are found to exhibit excellent antimicrobial activities against Escherichia coli, Staphylococcus aureus, Candida albicans, and Rhizopus oryzae with minimum inhibitory concentrations (MICs) of 8, 12, 60, and 40 µg mL?1, respectively. As a specific highlight, their inherent outstanding biocompatibility and significant accelerating effects on the healing of uninfected, E. coli‐infected, and S. aureus‐infected wounds imply that these novel polysaccharide‐based materials can be used as dressings for clinical skin regeneration, particularly for infected wounds. 相似文献
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Conformal Coating of Co/N‐Doped Carbon Layers into Mesoporous Silica for Highly Efficient Catalytic Dehydrogenation–Hydrogenation Tandem Reactions
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Zhujun Zhang Xiangru Wei Yan Yao Zhi Chen Aijian Zhang Wei Li Winston Duo Wu Zhangxiong Wu Xiao Dong Chen Dongyuan Zhao 《Small (Weinheim an der Bergstrasse, Germany)》2017,13(42)
To maximize the utilizing efficiency of cobalt (Co) and optimize its catalytic activity and stability, engineering of size and interfacial chemical properties, as well as controllable support are of ultimate importance. Here, the concept of coating uniform thin Co/N‐doped carbon layers into the mesopore surfaces of mesoporous silica is proposed for heterogeneous aqueous catalysis. To approach the target, a one‐step solvent‐free melting‐assisted coating process, i.e., heating a mixture of a cobalt salt, an amino acid (AA), and a mesoporous silica, is developed for the synthesis of mesoporous composites with thin Co/N‐doped carbon layers uniformly coated within mesoporous silica, high surface areas (250–630 m2 g−1), ordered mesopores (7.0–8.4 nm), and high water dispersibility. The strong silica/AA adhesive interactions and AA cohesive interactions direct the uniform coating process. The metal/N coordinating, carbon anchoring, and mesopore confining lead to the formation of tiny Co nanoclusters. The carbon intercalation and N coordination optimize the interfacial properties of Co for catalysis. The optimized catalyst exhibits excellent catalytic performance for tandem hydrogenation of nitrobenzene and dehydrogenation of NaBH4 with well‐matched reaction kinetics, 100% conversion and selectivity, high turnover frequencies, up to ≈6.06 molnitrobenzene molCo−1 min−1, the highest over transition‐metal catalysts, and excellent stability and magnetic separability. 相似文献
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Paul J. Molino Zhilian Yue Binbin Zhang Anthony Tibbens Xiao Liu Robert. M. I. Kapsa Michael J. Higgins Gordon G. Wallace 《Advanced Materials Interfaces》2014,1(3)
Organic conducting polymers (OCPs) are currently the subject of intense research in the area of biomaterials and bioelectronics. Of the OCPs, poly(3,4‐ethylenedioxythiophene) (PEDOT) has attracted significant interest, however there has been little work on investigating the incorporation of biological compounds as the dopant species in the polymer which are aimed at enhancing the biocompatibility and biofunctionality of the material. Here, we incorporate the biological dopants dextran sulphate, chondroitin sulphate, and alginate, into PEDOT polymers and investigate their influence on a suite of physicochemical and electrochemical properties. We employ QCM‐D to study the mass of adsorption and the viscoelastic properties of the important extracellular matrix proteins fibronectin and collagen. Furthermore, we use QCM‐D to study the adhesion of PC12 neural cells to the PEDOT‐biodopant polymers with and without an adsorbed protein conditioning layer. QCM‐D was found to be an excellent tool with which to study conducting polymer–biological interactions, with this report the first time that QCM‐D has been used to study cell interactions with conducting polymer biomaterials. 相似文献
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The LSP test method was used to compare various surface treatments of spinal rods for dorsal spine implant systems. This test method allowed a fast testing. Result were given after one or two weeks in comparison to 6 to 8 months. Rods made of two different cp‐Titanium materials ( Ti‐2 and Ti‐4) were tested. Best results with a LSP value of 167 Mio. were achieved with Ti‐4 material, shot peened with steel balls and glass beads. In comparison the lowest LSP value showed 81 Mio with Ti‐2 material shot peened with glass beads only. This kind of high speed testing reduced the typical development period from two years to at least 6 months. 相似文献
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The covalent and non‐covalent immobilization of growth factors such as recombinant human bone morphogenetic protein 2 (rhBMP‐2) on metals and bone replacement materials in bioactive form is a recent development. Up to now the immobilization technology usually involved the chemical modification and activation of the biomaterial surface followed by attachment of the bioactive protein. Here we suggest an alternative method in which an affinity tag fused to an active protein will allow immobilization without additional chemistry. For biomaterials such as minerals, metals (titanium, steel, CoCrMo), glass ceramics, teflon and possibly bone and teeth ideal adhesion molecules would be the foot proteins (Mefps) of the mussel M. edulis which contain the rare amino acid dihydroxy phenylalanine (DOPA). Recently it could be shown by Messersmith's group that a single DOPA‐molecule can be non‐covalently bound to titanium dioxide surface with a dissociation energy of 22.2 kcal/mol (Lee, H.; Scherer, N. F.; Messersmith, P. B. Proc. Natl. Acad. Sci. U. S. A 2006, 103, 12999–13003).We therefore propose the DOPA‐tag as a general and versatile affinity tag for the immobilization of proteins on biomaterials. 相似文献