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Shufan Chen, Xueqian Chen, Lijuan Zhang, Juanjuan Gao, Qiang Ma
In this paper, a facilely prepared electrochemiluminescence (ECL) biosensor was developed for Escherichia coli (E. coli) O157:H7 quantitative detection based on polydopamine (PDA) surface imprinted polymer (SIP) and nitrogen-doped graphene quantum dots (N-GQDs). N-GQDs with a high quantum yield of 43.2% were synthesized. The uniform PDA SIP film for E. coli O157:H7 was established successfully with a facile route. The dopamine and E. coli O157:H7 were mixed and electropolymerized directly on the electrode. After removed E...
January 18, 2017: ACS Applied Materials & Interfaces
Yang Wang, Hao Yuan, Piming Ma, Huiyu Bai, Mingqing Chen, Weifu Dong, Yi Xie, Yogesh S Deshmukh
Natural nacre is well-known by its unique properties due to the well-recognized "brick and mortar" structure. Inspired by the natural nacre, graphene oxide (GO) was modified with dopamine in aqueous solution and then chemically reduced to yield polydopamine-capped reduce GO (PDG). The artificial nacre films of poly(vinyl alcohol) (PVA) and PDG presentating layered structure had been successfully constructed via vacuum-assisted assembly process, in which PDG and PVA acted as "bricks" and "mortar", respectively...
January 17, 2017: ACS Applied Materials & Interfaces
Chao Zhang, Hao-Nan Li, Yong Du, Meng-Qi Ma, Zhi-Kang Xu
The mussel-inspired polydopamine (PDA) coatings have been broadly exploited for constructing functional membrane surfaces. One-step co-deposition of PDA with antifouling polymers, especially zwitterionic polymer, has been regarded as a promising strategy for fabricating antifouling membrane surfaces. However, one challenge is that the co-deposition is usually a slow process with ten hours or even several days. Herein, we report that CuSO4/H2O2 is able to notably accelerate the co-deposition process of PDA with poly(sulfobetaine methacrylate) (PSBMA)...
January 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Maria Paola Conte, King Hang Aaron Lau, Rein V Ulijn
Biocatalytic control of molecular self-assembly provides an effective approach for developing smart biomaterials, allowing versatile enzyme-mediated tuning of material structure and properties as well as biomedical applications. We functionalized surfaces with bioinspired polydopamine and polyphenol coatings to study the effects of enzyme surface localization and surface release on the self-assembly process. We show how these coatings could be conveniently used to release enzymes for bulk gelation as well as to irreversibly immobilize enzymes for localizing the self-assembly to the surface...
January 12, 2017: ACS Applied Materials & Interfaces
Jinkyu Lee, Sajeesh Kumar Mp, Taufiq Ahmad, Min Suk Lee, Heeseok Yang, Do-Gyoon Kim, Kyobum Kim, Bosun Kwon, Heungsoo Shin
Although bone morphogenetic protein-2 (BMP-2) has been frequently used to stimulate bone formation, it has several side effects to be addressed, including the difficulty in optimization of clinically relevant doses and unwanted induction of cancerous signaling processes. In this study, an osteogenic peptide (OP) derived from BMP-2 was investigated as a substitute for BMP-2. In vitro studies showed that OP was able to enhance in the osteogenic differentiation and mineralization of human mesenchymal stem cells (hMSCs)...
January 4, 2017: Tissue Engineering. Part A
V Giel, M Perchacz, J Kredatusová, Z Pientka
Functionalised titanate nanotubes (TiNTs) were incorporated to poly(5,5-bisbenzimidazole-2,2-diyl-1,3-phenylene) (PBI) or poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) for improving the interfacial compatibility between the polymer matrix and inorganic material and for altering the gas separation performance of the neat polymer membranes. Functionalisation consisted in oxidative polymerisation of dopamine-hydrochloride on the surface of non-functionalised TiNTs. Transmission electron microscopy (TEM) confirmed that a thin polydopamine (PDA) layer was created on the surface of TiNTs...
December 2017: Nanoscale Research Letters
Zhuang Rao, Kai Feng, Beibei Tang, Peiyi Wu
A new metal-organic framework/graphene oxide composite (IRMOF-3/GO) with high adsorption capacity of copper(II) (maximal adsorption amount = 254.14 mg/g at pH 5.0 and 25 °C) was prepared. Novel and highly efficient nanofiltration (NF) membrane can be facilely fabricated via surface decoration of IRMOF-3/GO onto polydopamine (PDA)-coated polysulfone (PSF) substrate. After decoration of IRMOF-3/GO, membrane surface potential increased from 6.7 to 13.1 mV at pH 5.0 and 25 °C. Due to the adsorption effect of IRMOF-3/GO and the enhancement of membrane surface potential, the prepared NF membrane (the loading amount of IRMOF-3/GO is ca...
January 11, 2017: ACS Applied Materials & Interfaces
Zhen Zhao, Hongda Chen, Hua Zhang, Lina Ma, Zhenxin Wang
In this work, a conducting porous polymer hydrogel-based electrochemical sensor has been developed for rapid detection of copper (II) ions (Cu(2+)). The polymer (termed as PAAM/PA/PDA) hydrogel is prepared through multi-interactions of the monomers dopamine (DA), acrylamide (AAM) and phytic acid (PA) under mild ambient conditions: the AAM polymerizes through free-radical polymerization, DA occurs poly coupling reaction, and PA crosslinks polydopamine (PDA) and polyacrylamide (PAAM) by hydrogen bonds. The three dimensional (3D) network nanostructured PAAM/PA/PDA hydrogel not only provides a large surface area for increasing the amount of immobilized molecules/ions, but also exhibits a good conductivity...
December 21, 2016: Biosensors & Bioelectronics
Jun-Gang Wang, Xin Hua, Meng Li, Yi-Tao Long
Polydopamine functionalized plasmonic nanocomposites with well distributed catalytically active small gold nanoislands around large gold core were fabricated without using any chemical reductant or surfactant. The optical properties, surface molecular structures and ensemble catalytic activity of the gold nanocomposites were investigated by time-of-flight secondary ion mass spectrometry and UV-Vis spectroscopy, respectively. Moreover, the considerable catalytic activity of the nanocomposites toward 4-nitrophenol reduction was real time monitored by dark-field spectroscopy techniques at single-nanoparticle level avoiding averaging effects in bulk systems...
December 27, 2016: ACS Applied Materials & Interfaces
Luke Klosterman, Christopher J Bettinger
The facile preparation of conformal polydopamine (PDA) films on broad classes of materials has prompted extensive research into a wide variety of potential applications for PDA. The constituent molecular species in PDA exhibit diverse chemical moieties, and therefore highly variable properties of PDA-based devices may evolve with post-processing conditions. Here we report the use of redox-inactive cations for oxidative post-processing of deposited PDA films. PDA films incubated in alkaline CaCl₂ solutions exhibit accelerated oxidative evolution in a dose-dependent manner...
December 22, 2016: International Journal of Molecular Sciences
Enjuan Cao, Wenzhen Duan, Feng Wang, Aiqin Wang, Yian Zheng
A facile method was reported to achieve hollow-tubular-oriented polydopamine (HTO-PDA) layer using natural kapok fiber (KF) as the bio-template without any pretreatments by altering hydrophobic fiber into hydrophilic one. Subsequently, the HTO-PDA can be utilized for direct in-situ deposition of Ag nanoparticles (NPs). The structures of pristine fiber and HTO-PDA, as well as the resulting Ag NPs attached HTO-PDA (Ag@HTO-PDA) were well characterized by means of scanning electron microscopy (SEM) coupled energy dispersion spectrum (EDS), x-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and Fourier transform infrared (FTIR) spectroscopy...
February 20, 2017: Carbohydrate Polymers
Jiajing Zhou, Qirong Xiong, Jielin Ma, Jinghua Ren, Phillip B Messersmith, Peng Chen, Hongwei Duan
We present a platform strategy that offers diverse flexibility in tailoring the structure and properties of core-shell plasmonic nanoparticles with built-in nanogaps. Our results have demonstrated that polydopamine serves multiple concerted functions as a nanoscale spacer to afford controllable nanogap sizes, a redox-active coating to promote metal shell growth, and a reactive scaffold to exclusively lock molecular probes inside the nanogap for surface-enhanced Raman scattering (SERS). More interestingly, the universal adhesion of polydopamine on diverse colloidal substrates allows for customized synthesis of multishell plasmonic nanogapped nanoparticles (NNPs) and multifunctional hybrid NNPs containing different cores (i...
December 27, 2016: ACS Nano
Yu-Xiang Dong, Jun-Tao Cao, Yan-Ming Liu, Shu-Hui Ma
Herein, a novel photoelectrochemical (PEC) immunosensing platform for highly sensitive detection of prostate specific antigen (PSA) was constructed based on dual-quenching of photocurrent from CdSe sensitized TiO2 electrode by gold nanoparticles decorated dopamine-melanin nanospheres (AuNPs-Dpa-melanin CNSs). In this proposal, CdSe sensitized TiO2 was used as photoelectrochemical matrix and the functional AuNPs-Dpa-melanin CNSs were used as signal quenching element. The dual quenching of the gold nanoparticles decorated Dpa-melanin CNSs to the CdSe sensitized TiO2 was achieved as follows: (i) the strong energy transfer between the CdSe quantum dots (QDs) and Au NPs diminishes the photocurrent signal of CdSe QDs; (ii) the steric hindrance of AuNPs-Dpa-melanin CNSs partly obstructs the diffusion of the electron donor, i...
December 18, 2016: Biosensors & Bioelectronics
Leihou Shao, Ruirui Zhang, Jianqing Lu, Caiyan Zhao, Xiongwei Deng, Yan Wu
The integration of different therapies into a single nanoplatform has shown great promise for synergistic tumor treatment. Herein, mesoporous silica (MS) coated polydopamine functionalized reduced graphene oxide (pRGO) further modified with hyaluronic acid (HA) (pRGO@MS-HA) has been utilized as a versatile nanoplatform for synergistic targeted chemo-photothermal therapy against cancer. A facile and green chemical method is adopted for the simultaneous reduction and noncovalent functionalization of graphene oxide (GO) by using mussel inspired dopamine (DA) to enhance biocompatibility and the photothermal effect...
January 18, 2017: ACS Applied Materials & Interfaces
Z Gorgin Karaji, M Speirs, S Dadbakhsh, J-P Kruth, H Weinans, A A Zadpoor, S Amin Yavari
Enhanced bone tissue regeneration and improved osseointegration are among the most important goals in design of multifunctional orthopedic biomaterials. In this study, we used additive manufacturing (selective laser melting) to develop multifunctional porous nitinol that combines superelasticity with a rationally designed microarchitecture and biofunctionalized surface. The rational design based on triply periodic minimal surfaces aimed to properly adjust the pore size, increase the surface area (thereby amplifying the effects of surface biofunctionalization), and resemble the curvature characteristics of trabecular bone...
January 18, 2017: ACS Applied Materials & Interfaces
Yan Lv, Yong Du, Wen-Ze Qiu, Zhi-Kang Xu
A defect-free and stable selective layer is of critical significance for thin film composite membrane with excellent separation performance and service durability. We report a facial strategy for fabricating thin film nanocomposite (TFN) nanofltration membranes (NFMs) based on the co-deposition of polydopamine, polyetheylenimine and silica nanoparticles. Tripled water flux can be obtained from the TFN NFMs as compared with those NFMs without silica nanoparticles. This is ascribed to the improved wettability of the membrane surfaces and the enlarged pore sizes of the selective layer...
December 21, 2016: ACS Applied Materials & Interfaces
Ben Liu, Lei Jin, Haoquan Zheng, Huiqin Yao, Yang Wu, Aaron Lopes, Jie He
A general synthetic methodology is reported to grow ultrafine cobalt-based nanoparticles (NPs, 2-7 nm) within high-surface-area mesoporous carbon (MC) frameworks. Our design strategy is based on colloidal amphiphile (CAM) templated oxidative self-polymerization of dopamine. The CAM templates consisting of a hydrophobic silica-like core and a hydrophilic PEO shell can coassemble with dopamine and template its self-polymerization to form polydopamine (PDA) nanospheres. Given that PDA has rich binding sites such as catechol and amine to coordinate metal ions (e...
January 18, 2017: ACS Applied Materials & Interfaces
Daoqing Fan, Erkang Wang, Shaojun Dong
Molecular logic devices with various functions play an indispensable role in molecular data transmission/processing. However, during any kinds of data transmission, a constant and unavoidable circumstance is the appearance of bit errors, which have serious effects on the regular logic computation. Fortunately, these errors can be detected via plugging a parity generator (pG) at the transmitting terminal and a parity checker (pC) at the receiving terminal. Herein, taking advantage of the efficient adsorption/quenching ability of polydopamine nanospheres toward fluorophore-labeled single-stranded DNA, we explored this biocompatible nanomaterial to DNA logic computation and constructed the first simple, enzyme-free, and G-quadruplex-free DNA pG/pC for error detection through data transmission...
January 18, 2017: ACS Applied Materials & Interfaces
Yilin Li, Tao Bao, Zilin Chen
In this work, we developed a capillary column modified with zeolitic imidazolate framework-8 as a novel stationary phase for open-tubular capillary electrochromatography. To immobilize zeolitic imidazolate framework-8 onto the inner surface of silica capillary, a bio-inspired polydopamine functionalization was used to functionalize the capillary surface with polydopamine. Firstly, a polydopamine layer was assembled inside the capillary. Secondly, due to noncovalent adsorption and covalent reaction ability, polydopamine could attract and anchor zeolitic imidazolate framework-8 onto the inner surface of capillary...
December 16, 2016: Journal of Separation Science
Man Li, Xiangmei Liu, Ziqiang Xu, K W K Yeung, Shuilin Wu
A hybrid coating composed of hydroxyapatite (HA), Ag nanoparticles (NPs), and chitosan (CS) was successfully prepared on a Ti substrate by a layer-by-layer assembly process. A polydopamine-assisted (PDA-assisted) coating showed a good bond with HA. Ag NPs were uniformly distributed into the hybrid coating through a solution method and ultraviolet light reduction. A CS nanofilm was deposited via spin-coating to control the release of Ag(+) from the hybrid coating. The results disclosed that the 3-layer CS coating could efficiently control the release of Ag(+) from the hybrid coating via the Fickian diffusion mechanism and that the PDA/HA/Ag/CS-1 coating exhibited antibacterial ratios of 63...
December 14, 2016: ACS Applied Materials & Interfaces
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