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https://www.readbyqxmd.com/read/28816311/hierarchical-core-shell-sio2-pda-biobr-microspheres-with-enhanced-visible-light-driven-photocatalytic-performance
#1
Shuai-Ru Zhu, Qi Qi, Wen-Na Zhao, Meng-Ke Wu, Yuan Fang, Kai Tao, Fei-Yan Yi, Lei Han
To explore catalysts combining highly accessible specific surface areas with low recombination of the photo-induced electron-hole pairs, a novel SiO2@PDA@BiOBr composite photocatalyst with a hierarchical core-shell structure was prepared by a facile solvothermal method. The catalyst shows a superior performance on photodegradation of Rhodamine B under visible light irradiation, especially for SiO2@PDA-2@BiOBr with the reactant kinetics constant (k = 0.0487 min(-1)). The enhanced photocatalytic performance of SiO2@PDA-2@BiOBr was ascribed to the decreased band-gap, higher surface area, and effectively photo-generated electron-hole pairs by the introduction of polydopamine (PDA)...
August 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28809089/inverted-quasi-spherical-droplets-on-polydopamine-tio2-substrates-for-enhancing-gene-delivery
#2
Seung-Hyun Kim, Mihyun Lee, Mira Cho, Il-Sun Kim, Kook In Park, Haeshin Lee, Jae-Hyung Jang
Devising efficient gene delivery systems is crucial to enhancing the therapeutic efficacy of gene-cell therapy approaches. Herein, inverted quasi-spherical (iQS) droplet systems, which enhance gene delivery efficiencies by reducing the path lengths of gene vectors, mediating motions of vectors at early stages, and raising the contact frequencies of vectors with cells, are developed by adopting the principle of 3D hanging-drop cell culture. Micrometer-sized polydopamine (pDA) holes are created on superhydrophobic titanium isopropoxide (TiO2 )-coated substrates by physical scraping; droplets are loaded on the pDA holes, and inversion of the substrate generates iQS droplets with large contact angles...
August 15, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28805657/noble-metal-free-tungsten-oxide-carbon-wox-c-hybrid-nanowires-for-highly-efficient-hydrogen-evolution
#3
Changhai Liu, Yangyang Qiu, Yujian Xia, Fang Wang, Xiaocun Liu, Xuhui Jeff Sun, Qian Liang, Zhidong Chen
Developing active, stable, and low-cost electrocatalysts to generate hydrogen is a great challenge in the fields of chemistry and energy. The nonprecious metal catalysts comprised of inexpensive and earth-abundant transition metals, regarded as promising substitute for noble metal catalysts used in hydrogen evolution reaction (HER), are still practically unfeasible mainly due to unsatisfactory activity and durability. Here we report the facile two-step preparation method for WOx nanowires with high concentration of oxygen vacancies (OVs) via calcination of W-polydopamine compound precursors...
August 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28801677/polyacrylamide-phytic-acid-polydopamine-conducting-porous-hydrogel-for-efficient-removal-of-water-soluble-dyes
#4
Zhen Zhao, Leijiao Li, Girma Selale Geleta, Lina Ma, Zhenxin Wang
Removal of toxic dyes from wastewater has become a hot topic in both academic and industrial fields since there is growing concern about the threat of sewage to human health. Herein, we demonstrate that the three-dimensional porous polyacrylamide-phytic acid-polydopamine (termed as PAAM/PA/PDA) hydrogel can be served as reusable adsorbent with high efficiency for either anionic or cationic dyes. Using methyl blue (MB), methylene blue (YMB), methyl violet (MV) and neutral red (NR) as model dyes, we investigate the effect of pH, temperature, dye concentration, and PAAM/PA/PDA hydrogel mass on the adsorption...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28798958/biofunctionalized-conductive-polymers-enable-efficient-co2-electroreduction
#5
Halime Coskun, Abdalaziz Aljabour, Phil De Luna, Dominik Farka, Theresia Greunz, David Stifter, Mahmut Kus, Xueli Zheng, Min Liu, Achim W Hassel, Wolfgang Schöfberger, Edward H Sargent, Niyazi Serdar Sariciftci, Philipp Stadler
Selective electrocatalysts are urgently needed for carbon dioxide (CO2) reduction to replace fossil fuels with renewable fuels, thereby closing the carbon cycle. To date, noble metals have achieved the best performance in energy yield and faradaic efficiency and have recently reached impressive electrical-to-chemical power conversion efficiencies. However, the scarcity of precious metals makes the search for scalable, metal-free, CO2 reduction reaction (CO2RR) catalysts all the more important. We report an all-organic, that is, metal-free, electrocatalyst that achieves impressive performance comparable to that of best-in-class Ag electrocatalysts...
August 2017: Science Advances
https://www.readbyqxmd.com/read/28789585/co-delivery-of-docetaxel-and-bortezomib-based-on-a-targeting-nanoplatform-for-enhancing-cancer-chemotherapy-effects
#6
Junpeng Nie, Wei Cheng, Yunmei Peng, Gan Liu, Yuhan Chen, Xusheng Wang, Chaoyu Liang, Wei Tao, Yinping Wei, Xiaowei Zeng, Lin Mei
Using facile polydopamine (PDA)-based surface modification and a pH-sensitive catechol-boronate binding mechanism, a novel drug delivery system was designed for the treatment of breast cancer. The system was able to achieve the following goals: active targeting, pH responsiveness, in vivo blood circulation for a prolonged period of time, and dual drug loading. After coating with PDA, the docetaxel (DTX)-loaded star-shaped copolymer cholic acid-poly(lactide-co-glycolide) nanoparticles (CA-PLGA@PDA/NPs) were functionalized with amino-poly(ethylene glycol)-folic acid (NH2-PEG-FA) and bortezomib (BTZ) to form the targeting composition, DTX-loaded CA-PLGA@PDA-PEG-FA + BTZ/NPs...
November 2017: Drug Delivery
https://www.readbyqxmd.com/read/28783432/fast-preparation-of-polydopamine-nanoparticles-catalyzed-by-fe-2-h2o2-for-visible-sensitive-smartphone-enabled-cytosensing
#7
Lei Jiao, Zijian Xu, Wenwen Du, He Li, Miao Yin
It is highly desired to develop facile methods for fast preparation of polydopamine nanoparticles (PDANS) for intensive promising applications. Considering the system of Fe(2+)/H2O2 can generate reactive oxygen species efficiently, which can accelerate the self-oxidative polymerization of dopamine, a new time-saving method has been proposed to prepare PDANS catalyzed by Fe(2+)/H2O2. Thereafter, a novel kind of colorimetric nanoprobe for sensitive detection of human breast cancer cells (MDA-MB-231 cell) based on the obtained PDANS-loaded pH indicator molecules (thymolphthalein) has been developed successfully...
August 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28782879/extraction-of-ochratoxin-a-in-red-wine-with-dopamine-coated-magnetic-multi-walled-carbon-nanotubes
#8
Hong Wan, Bo Zhang, Xiao-Lin Bai, Yan Zhao, Meng-Wei Xiao, Xun Liao
A new, rapid, green, and cost-effective magnetic solid-phase extraction of ochratoxin A from red wine samples was developed using polydopamine-coated magnetic multi-walled carbon nanotubes as the absorbent. The polydopamine-coated magnetic multi-walled carbon nanotubes were fabricated with magnetic multi-walled carbon nanotubes and dopamine by an in situ oxidative self-polymerization approach. Transmission electron microscopy, dynamic light scattering, X-ray photoelectron spectroscopy and vibrating sample magnetometry were used to characterize the absorbents...
August 7, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28782770/fabrication-of-co-sio2-c-ni-submicrorattles-as-highly-efficient-catalysts-for-4-nitrophenol-reduction
#9
Xiaohui Guo, Min Zhang, Jing Zheng, Jingli Xu, Tasawar Hayat, Njud S Alharbi, Baojuan Xi, Shenglin Xiong
In this paper, an extended Stöber method has been developed to fabricate a Ni(2+)-polydopamine (PDA) complex coated on Co3[Co(CN)6]2@SiO2 composites. After one-step carbonization involving the heat treatment of a Prussian blue analogue (PBA) of Co3[Co(CN)6]2 cores and the PDA-Ni(2+) shell under a nitrogen atmosphere, homogeneous Co@SiO2@C/Ni submicrorattles were synthesized. Notably, the silica interlayer played a vital role in the formation of such Co@SiO2@C/Ni submicrorattle structures. Without the protection of SiO2, Co-Ni@C composites were obtained instead and aggregated seriously due to sintering at high temperature...
August 7, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28780460/nanoscale-trifunctional-bovine-hemoglobin-for-fabricating-molecularly-imprinted-polydopamine-via-pickering-emulsions-hydrogels-polymerization
#10
Yanhua Sun, Shian Zhong
In this work, a novel strategy was developed for the selective recognition of protein based on oil-in-water Pickering emulsions-hydrogels polymerization and interfacial imprinting method. For the first time, nanoscale trifunctional bovine hemoglobin (BHb) played three roles simultaneously during the process, including emulsifier, template protein and sacrificial material for further exposing recognition sites. Prior to acting as stabilizers, bovine hemoglobin colloidal particles (BCPs) were firstly prepared by acidification and heat denaturation...
July 29, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28773136/fracture-toughness-and-elastic-modulus-of-epoxy-based-nanocomposites-with-dopamine-modified-nano-fillers
#11
Kwang Liang Koh, Xianbai Ji, Aravind Dasari, Xuehong Lu, Soo Khim Lau, Zhong Chen
This paper examines the effect of surface treatment and filler shape factor on the fracture toughness and elastic modulus of epoxy-based nanocomposite. Two forms of nanofillers, polydopamine-coated montmorillonite clay (D-clay) and polydopamine-coated carbon nanofibres (D-CNF) were investigated. It was found that Young's modulus increases with increasing D-clay and D-CNF loading. However, the fracture toughness decreases with increased D-clay loading but increases with increased D-CNF loading. Explanations have been provided with the aid of fractographic analysis using electron microscope observations of the crack-filler interactions...
July 10, 2017: Materials
https://www.readbyqxmd.com/read/28772987/preparation-of-superhydrophobic-film-on-ti-substrate-and-its-anticorrosion-property
#12
Min Zhu, Wenchuan Tang, Luyao Huang, Dawei Zhang, Cuiwei Du, Gaohong Yu, Ming Chen, Thee Chowwanonthapunya
Superhydrophobic films were fabricated on a titanium substrate with or without anodizing by using a self-assembling method. Firstly, the pretreatments of mechanical polishing/anodizing or mechanical polishing only were conducted, respectively. Subsequently, the preparation of polydopamine film layer, deposition of nano-silver particles, and post modification of 1H,1H,2H,2H-perfluorodecanethiol were performed on the surface of the pretreated substrate. The surface morphologies, compositions, wettability, and corrosion resistance of the films were investigated with scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), water contact angle measurements, and electrochemical tests, respectively...
June 8, 2017: Materials
https://www.readbyqxmd.com/read/28767226/mussel-inspired-architecture-of-high-flux-loose-nanofiltration-membrane-functionalized-with-antibacterial-reduced-graphene-oxide-copper-nanocomposites
#13
Junyong Zhu, Jing Wang, Adam Andrew Uliana, Miaomiao Tian, Yiming Zhang, Yatao Zhang, Alexander Volodin, Kenneth Simoens, Shushan Yuan, Jian Li, Jiuyang Lin, Kristel Bernaerts, Bart Van der Bruggen
Graphene-based nanocomposites have a vast potential for wide-ranging antibacterial applications due to the inherently strong biocidal activity and versatile compatibility of such nanocomposites. Therefore, graphene-based functional nanomaterials can introduce enhanced antibiofouling and antimicrobial properties to polymeric membrane surfaces. In this study, reduced graphene oxide-copper (rGOC) nanocomposites were synthesized as newly robust biocides via in situ reduction. Inspired by the emerging method of bridging ultrafiltration membrane surface cavities, loose nanofiltration (NF) membranes were designed using a rapid (2 h) bioinspired strategy in which rGOC nanocomposites were firmly codeposited with polydopamine (PDA) onto an ultrafiltration support...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28766594/liquid-immune-structural-colors-with-angle-independence-inspired-from-hollow-melanosomes
#14
Bo Yi, Huifang Shen
In this work, hollow polydopamine (PDA) amorphous colloidal structures with liquid-immune and angle-independent structural colors have been successfully fabricated. Owing to the high refractive index contrast derived from hollow PDA, and its light-absorbing nature, the as-prepared colloidal materials demonstrate brilliant structural colors even in liquid environments.
August 2, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28760620/microcontact-printing-of-polydopamine-on-thermally-expandable-hydrogels-for-controlled-cell-adhesion-and-delivery-of-geometrically-defined-microtissues
#15
Yu Bin Lee, Se-Jeong Kim, Eum Mi Kim, Hayeon Byun, Hyung-Kwan Chang, Jungyul Park, Yu Suk Choi, Heungsoo Shin
Scaffold-free harvest of microtissue with a defined structure has received a great deal of interest in cell-based assay and regenerative medicine. In this study, we developed thermally expandable hydrogels with spatially controlled cell adhesive patterns for rapid harvest of geometrically controlled microtissue. We patterned polydopamine (PD) on to the hydrogel via microcontact printing (μCP), in linear shapes with widths of 50, 100 and 200 μm. The hydrogels facilitated formation of spatially controlled strip-like microtissue of human dermal fibroblasts (HDFBs)...
July 28, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28756194/red-blood-cell-membrane-camouflaged-melanin-nanoparticles-for-enhanced-photothermal-therapy
#16
Qin Jiang, Zimiao Luo, Yongzhi Men, Peng Yang, Haibao Peng, Ranran Guo, Ye Tian, Zhiqing Pang, Wuli Yang
Photothermal therapy (PTT) has represented a promising noninvasive approach for cancer treatment in recent years. However, there still remain challenges in developing non-toxic and biodegradable biomaterials with high photothermal efficiency in vivo. Herein, we explored natural melanin nanoparticles extracted from living cuttlefish as effective photothermal agents and developed red blood cell (RBC) membrane-camouflaged melanin (Melanin@RBC) nanoparticles as a platform for in vivo antitumor PTT. The as-obtained natural melanin nanoparticles demonstrated strong absorption at NIR region, higher photothermal conversion efficiency (∼40%) than synthesized melanin-like polydopamine nanoparticles (∼29%), as well as favorable biocompatibility and biodegradability...
July 20, 2017: Biomaterials
https://www.readbyqxmd.com/read/28754539/in-vitro-genotoxicity-and-cytotoxicity-of-polydopamine-coated-magnetic-nanostructures
#17
Anna Woźniak, Magdalena Walawender, Dominika Tempka, Emerson Coy, Karol Załęski, Bartosz F Grześkowiak, Radosław Mrówczyński
Synthesis of magnetic nanoparticles and magnetic nanoclusters was performed by the co-precipitation method or solvothermal synthesis, respectively, followed by oxidative polymerization of dopamine, resulting in a polydopamine (PDA) shell. The nanomaterials obtained were described using TEM, FTIR and magnetic measurements. For the first time, cyto- and genotoxicity studies of polydopamine-coated nanostructures were performed on cancer and normal cell lines, providing in-depth insight into the toxicity of such materials...
July 25, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28746885/injectable-hydrogel-based-on-quaternized-chitosan-gelatin-and-dopamine-as-localized-drug-delivery-system-to-treat-parkinson-s-disease
#18
Yizhuo Ren, Xin Zhao, Xiaofeng Liang, Peter X Ma, Baolin Guo
There is still an enormous demand for designing materials to the treatment of Parkinson's disease, and dopamine-based injectable polysaccharide hydrogels as localized drug delivery system have huge potential. Here, we developed a facile approach to prepare dopamine-based and polydopamine crosslinked injectable hydrogels by simply oxidizing a mixture of quaternized chitosan, gelatin and dopamine under physiological conditions. These injectable quaternized hydrogels showed stable mechanical strength by rheometer and exhibited good degradability evaluated by in vitro degradation test...
July 23, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28731325/bioinspired-and-biomimetic-agnps-gentamicin-embedded-silk-fibroin-coatings-for-robust-antibacterial-and-osteogenetic-applications
#19
Wenhao Zhou, Zhaojun Jia, Pan Xiong, Jianglong Yan, Yangyang Li, Ming Li, Yan Cheng, Yufeng Zheng
With the progressively increasing demand for orthopedic Ti implants, the balance between two primary complications restricting implant applications is needed to be solved: the lack of bone tissue integration and biomedical device-associated infections (BAI), where emergence of multiresistance bacteria make it worse. Notably, a combination of silver nanoparticles (AgNPs) and a kind of antibiotic can synergistically inhibit bacterial growth, where a low concentration of AgNPs has been confirmed to promote the proliferation and osteogenesis of osteoblasts...
August 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28730803/three-dimensional-graphene-foam-filled-elastomer-composites-with-high-thermal-and-mechanical-properties
#20
Haoming Fang, Yunhong Zhao, Yafei Zhang, Yanjuan Ren, Shu-Lin Bai
To meet the increasing demands for effective heat management of electronic devices, a graphene-based polymeric composite is considered to be one of the candidate materials owing to the ultrahigh thermal conductivity (TC) of graphene. However, poor graphene dispersion, low quality of exfoliated graphene, and strong phonon scattering at the graphene/matrix interface restrict the heat dissipation ability of graphene-filled composites. Here, a facile and versatile approach to bond graphene foam (GF) with polydimethylsiloxane (PDMS) is proposed, and the corresponding composite with considerable improvement in TC and insulativity is fabricated...
August 9, 2017: ACS Applied Materials & Interfaces
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