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Feng Hu, Hongchao Yang, Changhong Wang, Yejun Zhang, Huan Lu, Qiangbin Wang
Rational design of cost-effective, nonprecious metal-based catalysts with desirable oxygen reduction reaction (ORR) performance is extremely important for future fuel cell commercialization, etc. Herein, a new type of ORR catalyst of Co-N-doped mesoporous carbon hollow sphere (Co-N-mC) was developed by pyrolysis from elaborately fabricated polystyrene@polydopamine-Co precursors. The obtained catalysts with active Co sites distributed in highly graphitized mesoporous N-doped carbon hollow spheres exhibited outstanding ORR activity with an onset potential of 0...
October 18, 2016: Small
Saeed Zavareh, Milad Mahdi, Soheyla Erfanian, Hamid Hashemi-Moghaddam
PURPOSE: Carrier-mediated drug delivery systems can be used to increase the intracellular concentration of drugs in cancerous cells, thereby improving drug biodistribution and minimizing unwanted side effects. This study aimed to investigate the effect of synthesized magnetic molecularly imprinted polydopamine for controlled doxorubicin (DOX) delivery in a breast adenocarcinoma model of BALB/c mice with an external magnetic field. METHODS: The synthesized DOX-imprinted polydopamine (DOX-IP) was characterized using Fourier transform infrared spectroscopy and scanning electron microscopy...
October 17, 2016: Cancer Chemotherapy and Pharmacology
Young Kwang Kim, Eun Bi Kang, Sung Han Kim, Shazid Md Sharker, Beyung Youn Kong, Insik In, Kang Dae Lee, Sung Young Park
In this study, a new hydrophilic-hydrophobic transition surface was designed via visible-light-induced photocatalytic perfluorinated silica-based fluorescent carbon nanoparticles (FNPs)/TiO2. Perfluorinated silica-polydopamine hybrid FNPs (f-FNPs) were easily fabricated by carbonization in an emulsion system consisting of tetraethyl orthosilicate and dopamine, followed by the deposition of TiO2 on f-FNPs, which demonstrated the reversal from hydrophobic to hydrophilic nature during successful photocatalysis...
October 17, 2016: ACS Applied Materials & Interfaces
Miao Ai, Zhiyun Du, Siqi Zhu, Hongjuan Geng, Xu Zhang, Qing Cai, Xiaoping Yang
OBJECTIVE: The object is to find a functional one-dimensional nanofibrous filler for composite resin, which is able to provide both efficient reinforcement and high antibacterial activity. METHODS: Hydroxyapatite (HA) nanowires were synthesized via hydrothermal technique using calcium oleate as the precursor. Polydopamine (PDA)-coated HA (HA-PDA) nanowires were prepared by soaking HA nanowires in dopamine (DA) aqueous solution. Silver nanoparticles (AgNPs)-laden HA (HA-PDA-Ag) nanowires were prepared via reduction reaction by adding silver nitrate and glucose into HA-PDA suspensions in DI water...
October 10, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
Yang Hu, Weihua Dan, Shanbai Xiong, Yang Kang, Arvind Dhinakar, Jun Wu, Zhipeng Gu
: To improve the mechanical properties and biocompatibility of collagen I matrix, a novel and facile strategy was developed to modify porcine acellular dermal matrix (PADM) via dopamine self-polymerization followed by collagen immobilization to enhance the biological, mechanical and physicochemical properties of PADM. Mechanism study indicated that the polymerization of dopamine onto PADM surface could be regulated by controlling the amount of hydrogen bonds forming between phynol hydroxyl (C-OH) and nitrogen atom (N-C=O) within collagen fibers of PADM...
October 12, 2016: Acta Biomaterialia
Hong Li, Yi Jia, Xiyun Feng, Junbai Li
Inspired by the composition of adhesive proteins in mussel, a facile, low-cost, and green approach to construct robust polydopamine (PDA) microcapsules as carriers for insulin delivery is developed. The morphology and shell thickness of the capsules could be tuned by varying the concentration of dopamine or the pH of Tris-HCl buffer. The PDA capsules are stable enough for long-term storage and transportation in practical application. The fluorescent property of PDA capsules labeled with FITC is beneficial in monitoring the safety and efficacy of drug carriers...
October 5, 2016: Journal of Colloid and Interface Science
Junming Li, Yun Fu, Xiaodong Shi, Zhenming Xu, Zhian Zhang
Urchin-like ZnS microspheres decorated with nitrogen-doped carbon (ZnS@NC) are designed by a facile two-step method, in which the unrchin-like ZnS microspheres were coated by polydopamine and then calcined at inert gas ambient. When employed as the anode material for lithium ion batteries (LIBs) and sodium ion batteries (SIBs), the ZnS@NC electrode can exhibit a reversible lithium storage capacity of 690 mAh g-1 after 100 cycles at 100 mA g-1 and a reversible sodium storage capacity of 460 mAh g-1 after 80 cycles at 200 mA g-1...
October 14, 2016: Chemistry: a European Journal
Deqiu Xu, Yuling Su, Lili Zhao, Fancui Meng, Chang Liu, Yayuan Guan, Jiya Zhang, Jianbin Luo
Inspired by mussel-adhesion phenomena in nature, a simple, mild surface modification process was elaborated to endow the polyurethane (PU) substrate with antibacterial/antifouling properties. In the present study, polydopamine was coated directly onto polyurethane surfaces. AgNO3 was then added and absorbed onto the surface by the active catechol and amine groups of the polydopamine coating. Meanwhile, the adsorbed Ag(+) ions were reduced in situ into metallic silver nanoparticles by the "bridge" of the polydopamine coating which yielded a coating with good antimicrobial properties...
October 13, 2016: Journal of Biomedical Materials Research. Part A
Jie Cao, Charl J Jafta, Jiang Gong, Qidi Ran, Xianzhong Lin, Roberto Félix, Regan G Wilks, Marcus Bär, Jiayin Yuan, Matthias Ballauff, Yan Lu
In this study, dispersible mesoporous nitrogen-doped hollow carbon nanoplates have been synthesized as a new anisotropic carbon nanostructure using gibbsite nanoplates as templates. The gibbsite-silica core-shell nanoplates were first prepared before the gibbsite core was etched away. Dopamine as carbon precursor was self-polymerized on the hollow silica nanoplates surface assisted by sonification, which not only favors a homogeneous polymer coating on the nanoplates but also prevents their aggregation during the polymerization...
October 13, 2016: ACS Applied Materials & Interfaces
Hongshi Ma, Jian Luo, Zhe Sun, Lunguo Xia, Mengchao Shi, Mingyao Liu, Jiang Chang, Chengtie Wu
Primary bone cancer brings patients great sufferings. To deal with the bone defects resulted from cancer surgery, biomaterials with good bone-forming ability are necessary to repair bone defects. Meanwhile, in order to prevent possible tumor recurrence, it is essential that the remaining tumor cells around bone defects are completely killed. However, there are few biomaterials with the ability of both cancer therapy and bone regeneration until now. Here, we fabricated a 3D-printed bioceramic scaffold with a uniformly self-assembled Ca-P/polydopamine nanolayer surface...
October 5, 2016: Biomaterials
Yong Du, Wen-Ze Qiu, Yan Lv, Jian Wu, Zhi-Kang Xu
Nanofiltration membranes (NFMs) are widely used in saline water desalination, waste water treatment and chemical product purification. However, conventional NFMs suffer from broad pore size distribution, which limits their applications for fine separation, especially in complete separation of molecules with slight difference in molecular size. Herein, defect-free composite NFMs with narrow pore size distribution are fabricated using a contra-diffusion method, with dopamine/polyethylenimine solution on the skin side and ammonium persulfate solution on the other side of the ultrafiltration substrate...
October 11, 2016: ACS Applied Materials & Interfaces
Lei Zhao, Wei Wang, Weihua Hu
Various approaches have been developed to visualize latent fingerprint (LFP) for personal identification but simultaneous transfer of LFP for preservation has yet to be achieved. We herein report a novel strategy for simultaneous transfer and imaging of LFPs on a broad variety of substrates by using the interfacial separation of polydopamine (PDA) thin film, followed by electroless silver deposition. In this approach, a PDA thin film deposited on a polydimethylsiloxane (PDMS) flake is used to cover the substrate carrying LFPs and then gently peeled off...
October 11, 2016: Analytical Chemistry
Shan Yu, Ying Gao, Xu Mei, Tanchen Ren, Su Liang, Zhengwei Mao, Changyou Gao
The selective adhesion and migration of endothelial cells (ECs) over smooth muscle cells (SMCs) is very important in the rapid endothelialization of blood-contacting implants, to prevent vascular restenosis. In this study, a uniform cell-resistant layer of methacrylate-functionalized hyaluronic acid (HA) was first immobilized on a poly(ε-caprolactone) (PCL) film via polydopamine coupling. Then, a density gradient of thiol-functionalized Arg-Glu-Asp-Val (REDV) peptide was prepared on the HA layer via thiol-ene click chemistry and the continuous injection method...
October 10, 2016: ACS Applied Materials & Interfaces
Yuanyuan Li, Chunhuan Jiang, Dawei Zhang, Ying Wang, Xiaoyan Ren, Kelong Ai, Xuesi Chen, Lehui Lu
: Near infrared light responsive nanoparticles can transfer the absorbed NIR optical energy into heat, offering a desirable platform for photoacoustic (PA) imaging guided photothermal therapy (PTT) of tumor. However, a key issue in exploiting this platform is to achieve optimal combination of PA imaging and PTT therapy in single nanoparticle. Here, we demonstrate that the biodegradable polydopamine nanoparticles (PDAs) are excellent PA imaging agent and highly efficient for PTT therapy, thus enabling the optimal combination of PA imaging and PTT therapy in single nanoparticle...
October 6, 2016: Acta Biomaterialia
Jisoo Shin, Jung Ho Cho, Yoonhee Jin, Kisuk Yang, Jong Seung Lee, Hyun-Ji Park, Hyung-Seop Han, Jinkyu Lee, Hojeong Jeon, Heungsoo Shin, Seung-Woo Cho
Using small interfering RNA (siRNA) to regulate gene expression is an emerging strategy for stem cell manipulation to improve stem cell therapy. However, conventional methods of siRNA delivery into stem cells based on solution-mediated transfection are limited due to low transfection efficiency and insufficient duration of cell-siRNA contact during lengthy culturing protocols. To overcome these limitations, a bio-inspired polymer-mediated reverse transfection system is developed consisting of implantable poly(lactic-co-glycolic acid) (PLGA) scaffolds functionalized with siRNA-lipidoid nanoparticle (sLNP) complexes via polydopamine (pDA) coating...
September 26, 2016: Small
Carl P Frick, Daniel R Merkel, Christopher M Laursen, Stephan A Brinckmann, Christopher M Yakacki
This study explores the functionalization of main-chain nematic elastomers with a conductive metallic surface layer using a polydopamine binder. Using a two-stage thiol-acrylate reaction, a programmed monodomain is achieved for thermoreversible actuation. A copper layer (≈155 nm) is deposited onto polymer samples using electroless deposition while the samples are in their elongated nematic state. Samples undergo 42% contraction when heated above the isotropic transition temperature. During the thermal cycle, buckling of the copper layer is seen in the direction perpendicular to contraction; however, transverse cracking occurs due to the large Poisson effect experienced during actuation...
September 26, 2016: Macromolecular Rapid Communications
Lu Han, Yanning Zhang, Xiong Lu, Kefeng Wang, Zhenming Wang, Hongping Zhang
Stimuli-responsive hydrogels can respond to stimuli by phase transformation or volume change and exhibit specific functions. Near-infrared (NIR) responsive hydrogel is a type of stimuli-responsive hydrogel, which can be precisely controlled by altering the radiation intensity, exposure time of the light source, and irradiation sites. Here, polydopamine nanoparticles (PDA-NPs) were introduced into a poly (N-isopropylacrylamide) (PNIPAM) network to fabricate a PDA-NPs/PNIPAM hydrogel with NIR responsibility, self-healability, and cell/tissue adhesiveness...
October 6, 2016: ACS Applied Materials & Interfaces
Penglei Zheng, Bilin Zhang, Zhimin Luo, Wei Du, Pengqi Guo, Yulan Zhou, Ruimiao Chang, Chun Chang, Qiang Fu
Estrone molecularly imprinted polymers were synthesized through the self-polymerization of dopamine on the surface of silica gels, which had the characteristics of mild polymerization conditions, simple reaction procedure and good specific recognition ability for estrone. The estrone molecularly imprinted polymers were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, elemental analysis and nitrogen adsorption-desorption tests. The characterization confirmed that the imprinted polymers were successfully grafted on the surface of silica gels...
October 5, 2016: Journal of Separation Science
Ji Yup Kim, Hojae Lee, Taegyun Park, Joonhong Park, Mi-Hee Kim, Hyeoncheol Cho, Wongu Youn, Sung Min Kang, Insung S Choi
The cell nanoencapsulation, generating cell-in-shell structures ("artificial spores"), provides a chemical toolbox for controlling the cellular behaviors and functional characteristics of individual cells. Among the shell materials studied so far, naturally occuring polyphenolic compounds, including polydopamine and tannic acid, have intensively been employed in cell-surface engineering, because their material-independent coating property eliminates an extra priming step for inducing subsequent shell formation...
October 5, 2016: Chemistry, An Asian Journal
Shosuke Ito, Ludger Kolbe
Most readers of Pigment Cell & Melanoma Research are familiar with the biological/clinical aspects of pigmentation and melanoma. On the other hand, other aspects of pigmentation research, such as the application of melanin nano-particles as novel biocompatible materials, mostly escape their attention. For example, "polydopamine (PDA)" has been attracting an upsurge in interest among material scientists (175 articles published in 2015 compared with 11 in 2010), but not so much among pigment scientists despite the fact that PDA closely mimics "dopamine-melanin" as it is produced by the spontaneous oxidative polymerization of dopamine at a slightly alkaline pH...
October 5, 2016: Pigment Cell & Melanoma Research
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