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Die Ling Zhao, Subhabrata Das, Tai-Shung Chung
Osmotic power generated by pressure-retarded osmosis (PRO) has attracted global attention as a clean, abundant and renewable energy resource. However, the substrates of PRO membranes are particularly prone to fouling because of their direct contact with various foulants in raw water. This leads to a significant decline in power density and impedes the commercialization of PRO technology. In this work, a facile surface modification method has been developed to obtain a new type of nanoparticle functionalized antifouling PRO membranes...
November 21, 2017: Environmental Science & Technology
Xinhong Yu, Wei Zhou, Zilin Chen
Layered double hydroxides (LDHs) have gained much attention in absorption and extraction fields due to their special structure and properties like high porosity, large surface area and excellent anion exchange capacity. However, LDHs are rarely used in capillary electrochromatography (CEC) by date due to the lack of appropriate immobilization method. In this work, by utilizing the unique coordination bonding between metal ions on LDHs and catechol groups on polydopamine layer, a polydopamine modification method was developed for in situ immobilization of LDHs on the inner surface of fused silica capillary...
November 12, 2017: Journal of Chromatography. A
Yan Wang, Fu-Qiang Gu, Li-Juan Ni, Kun Liang, Kyle Marcus, Shu-Li Liu, Fan Yang, Jin-Ju Chen, Zhe-Sheng Feng
Conductive polymer composites (CPCs) containing nanoscale conductive fillers have been widely studied for their potential use in various applications. In this paper, polypyrrole (PPy)/polydopamine (PDA)/silver nanowire (AgNW) composites with high electromagnetic interference (EMI) shielding performance, good adhesion ability and light weight are successfully fabricated via a simple in situ polymerization method followed by a mixture process. Benefiting from the intrinsic adhesion properties of PDA, the adhesion ability and mechanical properties of the PPy/PDA/AgNW composites are significantly improved...
November 16, 2017: Nanoscale
Xiao Xu, Lixin Wang, Zuyuan Luo, Yaofeng Ni, Haitao Sun, Xiang Gao, Yongliang Li, Siqi Zhang, Yan Li, Shicheng Wei
Reducing early nonbacterial inflammation induced by implanted materials and infection resulting from bacterial contamination around the implant-abutment interface could greatly accelerate implant osseointegration and reduce implant failure, which would be of clinical significance. In this study, we developed a facile and versatile strategy for the construction of anti-inflammatory and antibacterial surfaces on implants, such as orthopedic/dental implants. Briefly, the surfaces of polystyrene (PS) culture plates were first coated with polydopamine and then decorated with dexamethasone plus minocycline-loaded liposomes (Dex/Mino liposomes), which was confirmed by contact angle goniometry, X-ray photoelectron spectroscopy, and fluorescence microscopy...
November 15, 2017: ACS Applied Materials & Interfaces
Eun Bi Kang, Cheong A Choi, Zihnil Adha Islamy Mazrad, Sung Han Kim, Insik In, Sung Young Park
The tumor-specific sensitive fluorescence sensing of cellular alkaline phosphatase (ALP) activity based on host-guest specific and pH sensitive by ere conducted on coated surfaces and aqueous states. Cross-linked fluorescent nanoparticles (C-FNP) consisting of β-cyclodextrin (β-CD)/boronic acid (BA) and fluorescent hyaluronic acid [FNP(HA)] were conjugated to fluorescent polydopamine [FNP(pDA)]. To determine the quenching effect of this system, hydrolysis of 4-nitrophenyl phosphate (NPP) to 4-nitrophenol (NP) was performed in the cavity of β-CD in the presence of ALP activated photo-induced electron transfer (PET) between NP and C-FNP...
November 15, 2017: Analytical Chemistry
Jiebing Jiang, Xueni Sun, Yan Li, Chunhui Deng, Gengli Duan
Metal ions differed greatly in affinity towards phosphopeptides, and thus it is essential to systematically compare the phosphopeptides enrichment ability of different metal ions usually used in the IMAC techniques. In this work, for the first time, eight metal ions, including Nb(5+), Ti(4+), Zr(4+), Ga(3+), Y(3+), In(3+), Ce(4+), Fe(3+), were immobilized on the polydopamine (PDA)-coated Fe3O4 (denoted as Fe3O4@PDA-M(n+)), and systematically compared by the real biosamples, in addition to standard phosphopeptides...
February 1, 2018: Talanta
Yanbing Wang, Bin Shang, Miao Liu, Feng Shi, Bo Peng, Ziwei Deng
Engineering hollow particles with high complexity in their morphology or composition is highly desirable for both fundamental studies and practical applications. Here, we combine mussel-inspired polydopamine (PDA) chemistry with template-assisted and hydrothermal approaches to explore a general approach for engineering hollow PDA colloidal composite particles with tunable complexities in terms of particle geometry, shell architecture and chemical composition. PDA coating and hydrothermal treatment are carried out sequentially in the same environment, which not only simplifies the experimental procedure but also avoids the use of hazardous core-removers...
October 27, 2017: Journal of Colloid and Interface Science
Albert Jung, Preeti Makkar, Jhaleh Amirian, Byong-Taek Lee
The objective of the present study was to develop a novel hybrid multichannel biphasic calcium phosphate granule (MCG)-based composite system for cartilage regeneration. First, hyaluronic acid-gelatin (HG) hydrogel was coated onto MCG matrix (MCG-HG). Poly(lactic-co-glycolic acid) (PLGA) microspheres was separately prepared and modified with polydopamine subsequent to BMP-7 loading (B). The surface-modified microspheres were finally embedded into MCG-HG scaffold to develop the novel hybrid (MCG-HG-PLGA-PD-B) composite system...
January 1, 2017: Journal of Biomaterials Applications
Jie Wei, Aori Qileng, Yun Yan, Hongtao Lei, Shengsen Zhang, Weipeng Liu, Yingju Liu
An ultrasensitive photoelectrochemical (PEC) immunoassay based on multiple signal amplification strategy was fabricated for the detection of microcystin-LR (MC-LR). The CdS/TiO2 nanorod arrays (CdS/TiO2 NRAs) modified FTO electrode, which can weaken the self-oxidation by photogenerated holes of CdS nanoparticles, and limit the recombination of electron-hole pairs and broaden optical absorption of TiO2 NRAs, was used as a visible-light driven material to immobilize antigens. Then, Fe3O4 nanoparticles/polydopamine (Fe3O4@PDA) was used as the carrier to load secondary antibody (Ab2) and horseradish peroxidase (HRP), where Fe3O4 nanoparticles and HRP can synergistically accelerate the oxidation of 4-chloro-1-naphthol (4-CN) by H2O2 to produce biocatalytic precipitation (BCP) on the surface of modified electrode...
November 22, 2017: Analytica Chimica Acta
Ziwei Deng, Bin Shang, Bo Peng
Polydopamine is a synthetic analogue of natural melanin (eumelanin) produced from oxidative polymerization of dopamine. Owing to its strong adhesion ability, versatile chemical reactivity, biocompatibility and biodegradation, polydopamine is commonly applied as a versatile linker to synthesize colloidal materials with diverse structures, unique physicochemical properties and tunable functions, which allow for a broad scope of applications including biomedicine, sensing, catalysis, environment and energy. In this personal account, we discuss first about the different synthetic approaches of polydopamine, as well as its polymerization mechanism, and then with a comprehensive overview of recent progress in the synthesis and applications of polydopamine-based colloidal materials...
November 10, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Ayushi Priyam, Prachi Nagar, Ashwani Kumar Sharma, Pradeep Kumar
Efficient delivery of DNA to cells is the primary concern to address the objective of gene therapy. Many attempts have been made to develop polymeric carriers for gene delivery. To have an efficient carrier, it is vital to understand the properties of the vector for better stability, transfection efficiency and minimal toxicity. Branched polyethylenimine (bPEI) has been considered as the 'gold standard' for gene delivery but suffers a major drawback of exhibiting high cytotoxicity. Here, we have attempted to develop a mussel-derived polymer, polydopamine (PDA), conjugated polyethylenimine nanoparticles in such a way that the toxic nature of bPEI is suppressed by the conversion of free primary amine groups to secondary and tertiary amines...
October 26, 2017: Colloids and Surfaces. B, Biointerfaces
Ho Yeon Son, Kyeong Rak Kim, Jun Bae Lee, Trang Huyen Le Kim, Jihui Jang, Su Ji Kim, Moung Seok Yoon, Jin Woong Kim, Yoon Sung Nam
Noble metal nanostructures have been intensively investigated as active substrates for surface-enhanced Raman spectroscopy (SERS) from visible to near-IR wavelengths. However, metal nanoparticle-based SERS analysis in solutions is very challenging due to uncontrollable and irreproducible colloid aggregation. Here we report the templated synthesis of porous gold-silica hybrid microspheres and their application as reusable colloidal SERS substrates. Mesoporous polymer microspheres are synthesized and used as templates for the synthesis of non-aggregated gold nanoparticles, followed by polydopamine-mediated silicification to fabricate mesoporous gold-silica hybrid microspheres...
November 7, 2017: Scientific Reports
Liping Zhu, Takashi Isoshima, Baiju G Nair, Yoshihiro Ito
Dopamine-modified alginate and gelatin were prepared. The polymers were characterized and the properties of their aqueous solutions were investigated. Aqueous solutions of dopamine-modified alginate and gelatin with a concentration exceeding 20 mg/mL naturally formed gels after 16 h. Although polydopamine itself was not used for template-assisted nanostructure formation, the modified polymers could be used with dopamine. Mixing with dopamine allowed the precise shape of the template to be maintained in the resulting material, allowing nanopatterned surfaces and nanotubes to be prepared...
November 2, 2017: Nanomaterials
Yinling Wang, Chengzhou Zhu, Shuo Feng, Qiurong Shi, Shaofang Fu, Dan Du, Qiang Zhang, Yuehe Lin
As promising precious metal-free oxygen reduction reaction (ORR) electrocatalysts, Fe-N-C catalysts still face a great challenge to meet the requirement of practical applications. In this study, Fe, S, N-codoped hollow and porous carbon nanorods (Fe-S-N HPCNRs) were designed with the aim of improving the performance of Fe-N-C catalysts from the perspective of composition and structure. They were successfully prepared using cysteine, Fe(2+) salt, and polydopamine-encapsulated ZnO nanorods (ZnO NRs@PDA) as precursors by a pyrolysis-acid etching strategy...
November 13, 2017: ACS Applied Materials & Interfaces
Eun-Jae Chung, Dae-Ryong Jun, Dong-Wook Kim, Mi-Jung Han, Tack-Kyun Kwon, Sung-Wook Choi, Seong Keun Kwon
The use of injectable bulking agents is a feasible alternative procedure for conventional surgical therapy. In this study, poly(dimethylsiloxane) (PDMS) microspheres coated with polydopamine (PDA) were developed as a potential injection agent to prevent migration in vocal fold. Uniform PDMS microspheres are fabricated using a simple fluidic device and then coated with PDA. Cell attachment test reveals that the PDA-coated PDMS (PDA-PDMS) substrate favors cell adhesion and attachment. The injected PDA-PDMS microspheres persist without migration on reconstructed axial CT images, whereas, pristine PDMS locally migrates over a period of 12 weeks...
2017: PloS One
Feng Tang, Haitao Lei, Shujun Wang, Huixin Wang, Zhaoxia Jin
One-dimensional Fe-N-codoped porous carbon materials have shown great potential as sustainable and efficient oxygen reduction reaction (ORR) catalysts. Herein, a highly active ORR 1D Fe-N-C catalyst has been developed by pyrolyzing a complex of polydopamine nanotubes and Fe(NO3)3 at 800 °C. Porous PDA nanotubes as a resource for nitrogen-doped carbon and a coordination platform for Fe(3+) can provide well-distributed catalytic sites (Fe-N) after pyrolysis, and generate graphene-like carbon covers with proper thicknesses on Fe/Fe3C nanoparticles that effectively prevent agglomeration...
November 16, 2017: Nanoscale
Junwei Li, Madison A Baird, Michael A Davis, Wanyi Tai, Larry S Zweifel, Kristina M Adams Waldorf, Michael Gale, Lakshmi Rajagopal, Robert H Pierce, Xiaohu Gao
The ability to detect biomarkers with ultrahigh sensitivity radically transformed biology and disease diagnosis. However, owing to incompatibilities with infrastructure in current biological and medical laboratories, recent innovations in analytical technology have not received broad adoption. Here, we report a simple, universal 'add-on' technology (dubbed EASE) that can be directly plugged into the routine practices of current research and clinical laboratories and that converts the ordinary sensitivities of common bioassays to extraordinary ones...
2017: Nature biomedical engineering
Chun Kit K Choi, Xiaolu Zhuo, Yee Ting Elaine Chiu, Hongrong Yang, Jianfang Wang, Chung Hang Jonathan Choi
Nanoshells, classically comprising gold as the metallic component and silica as the dielectric material, are important for fundamental studies in nanoplasmonics. They also empower a myriad of applications, including sensing, energy harvesting, and cancer therapy. Yet, laborious preparation precludes the development of next-generation nanoshells with structural complexity, compositional diversity, and tailorable plasmonic behaviors. This work presents an efficient approach to the bottom-up assembly of concentric nanoshells...
November 9, 2017: Nanoscale
James M Seckler, Nikki M Meyer, Spencer T Burton, James N Bates, Benjamin Gaston, Stephen J Lewis
Small molecule S-nitrosothiols are a class of endogenous chemicals in the body, which have been implicated in a variety of biological functions. However, the labile nature of NO and the limits of current detection assays have made studying these molecules difficult. Here we present a method for detecting trace concentrations of S-nitrosothiols in biological fluids. Capacitive sensors when coupled to a semiconducting material represent a method for detecting trace quantities of a chemical in complex solutions...
2017: PloS One
Baozhen Wu, Wanlin Zhang, Ning Gao, Meimei Zhou, Yun Liang, Ying Wang, Fengting Li, Guangtao Li
In this work, we reported a new method for the convenient fabrication of various functional porous films, which cannot be directly generated using breath figures (BFs). A series of polystyrene-b-poly (ionic liquid) (PS-b-PIL) block copolymers were employed for BFs process for the first time. It was found that PS-b-PIL could form well-defined BFs porous structure. Remarkably, the described PS-b-PIL copolymers are prone to form hierarchical structure, and the formed pore structure is strongly dependent on the used experimental parameters...
October 25, 2017: Scientific Reports
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