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Yan Kang, Sunxiang Zheng, Casey Finnerty, Michael J Lee, Baoxia Mi
This study demonstrated the feasibility of using regenerable polyelectrolyte membranes to ultimately control the irreversible membrane fouling in a forward osmosis (FO) process. The regenerable membrane was fabricated by assembling multiple polyethyleneimine (PEI) and poly(acrylic acid) (PAA) bilayers on a polydopamine-functionalized polysulfone support. The resulting membrane exhibited higher water flux and lower solute flux in FO mode (with the active layer facing feed solution) than in PRO mode (with the active layer facing draw solution) using trisodium citrate as draw solution, most likely due to the unique swelling behavior of the polyelectrolyte membrane...
February 16, 2017: Environmental Science & Technology
Chongdan Luo, Qingxia Liu
In this work, a facile one-step approach was developed to modify hydrophobic polyvinylidene fluoride (PVDF) microfiltration membrane with superhydrophilicity and underwater superoleophobicity properties via a high-efficient deposition of polydopamine (PDA) coating oxidized by sodium periodate in a slightly acidic environment (pH = 5.0). In contrast to the traditional PDA coating on hydrophobic membranes autoxidized by O2 in a weak basic buffer solution, the superhydrophilicity and ultra-high pure water permeability (about 11934 L m-2 h-1 under 0...
February 16, 2017: ACS Applied Materials & Interfaces
Maoling Wu, Yinying Li, Rui Yue, Xiaodan Zhang, Yuming Huang
The removal of silver nanoparticles (AgNPs) from water is highly needed because of their increasing use and potential risk to the environment due to their toxic effects. Catalysis over AgNPs has received significant attention because of their highly catalytic performance. However, their use in practical applications is limited due to high cost and limited resources. Here, we present for the first time that the mussel-inspired Fe3O4@polydopamine (Fe3O4@PDA) nanocomposite can be used for efficient removal and recovery of AgNPs...
February 16, 2017: Scientific Reports
Florian Ponzio, Vincent Le Houérou, Spyridon Zafeiratos, Christian Gauthier, Tony Garnier, Loic Jierry, Vincent Ball
The formation of polydopamine composite membranes at the water/air interface using different chemical strategies is reported. The use of either small molecules (urea, pyrocatechol) or polymers paves the way to understand which kind of compounds can be used for the formation of PDA-composite free-standing membranes produced at the water/air inter-face. Based on these screening results, we have found that alginate grafted with catechol groups allows the formation of robust free-standing films with asymmetric composition, stimuli-responsive and self-healing properties...
February 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Lianshan Sun, Chunli Wang, Qujiang Sun, Yong Cheng, Limin Wang
On the purpose to find efficient non-noble metal catalysts for water splitting, hierarchical Ni-Mo-polydopamine microflowers are synthesized through a facile aqueous phase reaction at room temperature. Herein, NiMoO4 nanowires are utilized as Ni and Mo source, meantime, they can complex with dopamine to form hierarchical structure and affect the scale of the final product. And the energy dispersive spectrometer (EDS) measurement of Ni-Mo2C/C microflowers (MF) show a high content of Mo2C and Ni (>90 wt%)...
February 13, 2017: Chemistry: a European Journal
Haoqi Li, Yaroslav V Aulin, Laszlo Frazer, Eric Borguet, Rohit Kakodkar, Joseph Feser, Yan Chen, Ke An, Dmitriy A Dikin, Fei Ren
Carbonization of nature-inspired polydopamine can yield thin films with high electrical conductivity. Understanding of the structure of carbonized PDA (cPDA) is therefore highly desired. In this study, neutron diffraction, Raman spectroscopy, and other techniques indicate that cPDA samples are mainly amorphous with some short-range ordering and graphite-like structure that emerges with increasing heat treatment temperature. The electrical conductivity and the Seebeck coefficient show different trends with heat treatment temperature, while the thermal conductivity remains insensitive...
February 13, 2017: ACS Applied Materials & Interfaces
Xi Yang, Yong Du, Xi Zhang, Ai He, Zhi-Kang Xu
A mussel-inspired interlayer of polydopamine (PDA)/polyethylenimine (PEI) is codeposited on the ultrafiltration substrate to tune the interfacial polymerization of piperazine and trimesoyl chloride for the preparation of thin-film composite (TFC) nanofiltration membranes (NFMs). This hydrophilic interlayer results in an efficient adsorption of piperazine solution in the substrate pores. The solution height increases with the PDA/PEI codeposition time from 45 to 135 min due to the capillary effect of the substrate pores...
February 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Jianfeng Wang, Zhongmei Liu, Zhemin Zhou
To improve the catalysis of pullulanase from Anoxybacillus sp.WB42, Fe3O4@polydopamine nanoparticles (Fe3O4@PDA) were prepared and modified with functional groups for immobilization of pullulanases via covalent binding or ionic adsorption. Immobilized pullulanases had lower thermal stability than that of free pullulanase, whereas their catalysis depended on the surface characteristics of nanoparticles. As for covalent immobilization of pullulanases onto Fe3O4@PDA derivatives, the spacer grafted onto Fe3O4@PDA made the catalytic efficiency of pullulanase increase up to the equivalence of free enzyme but dramatically reduced the pullulanase thermostability...
February 9, 2017: Applied Biochemistry and Biotechnology
Min Lai, Ziyang Jin, Zhiguo Su
To investigate the influence of surface-biofunctionalized substrates on osteoblast behavior, a layer of aligned TiO2 nanotubes with a diameter of around 70nm was fabricated on titanium surface by anodization, and then osteogenic growth peptide (OGP) was conjugated onto TiO2 nanotubes through the intermediate layer of polydopamine. The morphology, composition and wettability of different surfaces were characterized by field-emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and contact angle measurements, respectively...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Pengjiao Zhang, Lu Yang, Qiang Li, Songhai Wu, Shaoyi Jia, Zhanyong Li, Zhenkun Zhang, Linqi Shi
Understanding the important role of the surface roughness of nano-/colloidal particles and harnessing them for practical applications need novel strategies to control the particles' surface topology. Although there are many examples of spherical particles with a specific surface roughness, non-spherical ones with similar surface features are rare. The current work report a one-step, straightforward and bio-inspired surface engineering strategy to prepare ellipsoidal particles with a controlled surface roughness...
February 9, 2017: ACS Applied Materials & Interfaces
Jing Li, Qingxiang Zhou, Yongli Liu, Man Lei
In this study, nanoscale zero-valent iron nanoparticles (NZVIs) were coated with silica and polydopamine using a two-step process. The coated nanoparticles were applied as adsorbents for removal of two common polycyclic aromatic hydrocarbons pollutants, phenanthrene (PHE) and anthracene (ANT) from aqueous system. Adsorption kinetics followed a pseudo-second-order model. Isotherms and thermodynamics were investigated and the results indicated that the adsorption process fit best to the Freundlich model and exhibited the characteristics of an exothermal physical adsorption process...
2017: Science and Technology of Advanced Materials
Helena P Prado Felgueiras, Li-Mei Wang, Ke-Feng Ren, Micaela M Querido, Qiao Jin, Mário Barbosa, Jian Ji, M Cristina L Martins
Infection and thrombus formation are still the biggest challenges for the success of blood contact medical devices. This work aims the development of an antimicrobial and hemocompatible biomaterial coating through which selective binding of albumin (passivant protein) from the blood stream is promoted and, thus, adsorption of other proteins responsible for bacterial adhesion and thrombus formation can be prevented. Polyurethane (PU) films were coated with hyaluronic acid, an antifouling agent, that was previously modified with thiol groups (HA-SH), using polydopamine as the binding agent...
February 6, 2017: ACS Applied Materials & Interfaces
Honglei Zhan, Tina Jagtiani, Jun F Liang
Tumor target specificity via chemotherapy is widely considered to be very effective on tumor treatment. For an ideal chemotherapeutic agent like Camptothecin (CPT) CPT is the abbreviation for Camptothecin, improved therapeutic efficacy and high selectivity are equally important. Inspired by adhesive proteins in mussels, here we developed a novel tumor targeting peptide XQ1 grafted CPT nanocrystals with polydopamine coating as a spacer. In this study, CPT nanocrystals were coated by polymerization of dopamine that was induced by plasma-activated water under an acidic environment, and then the tumor targeting peptide was grafted onto polydopamine (PDA) PDA is the abbreviation for polydopamine coated CPT nanocrystals through catechol chemistry...
February 1, 2017: European Journal of Pharmaceutics and Biopharmaceutics
Jian Sun, Wen-Hui Cui, Kun Du, Qian Gao, Mengmeng Du, Peijun Ji, Wei Feng
R-ɷ-transaminases transfer an amino group from an amino donor (e.g. (R)-1-phenylethylamine) onto an amino acceptor (e.g. pyruvate), resulting a co-product (e.g. d-alanine). This work intends to immobilize R-ɷ-Transaminase on MnO2 nanorods to achieve multienzyme catalysis. R-ɷ-Transaminase (RTA) and d-amino acid oxidase (DAAO) have been fused to an elastin-like polypeptide (ELP) separately through genetic engineering of the enzymes. ELP-RTA and ELP-DAAO have been separately immobilized on polydopamine-coated MnO2 nanorods...
January 31, 2017: Journal of Biotechnology
Yuling Chen, Zilin Chen
Novel covalent organic framework-1 modified magnetic nanoparticles (M-COF-1) were prepared for extraction of paclitaxel from rat plasma samples. Paclitaxel is an important anti-cancer drug in clinical chemotherapy. COF-1 was immobilized on the surface of magnetic nanoparticles by bio-inspired polydopamine functionalization method because polydopamine can supply catechol groups for supporting the immobilization of COF-1. The formation of M-COF-1 has been confirmed by Fourier transform infrared spectroscopy and transmission electron microscopy...
April 1, 2017: Talanta
Guanyao Wang, Xingyi Huang, Pingkai Jiang
Rapid evolution of energy storage devices expedites the development of high-energy-density materials with excellent flexibility and easy processing. The search for such materials has triggered the development of high-dielectric-constant (high-k) polymer nanocomposites. However, the enhancement of k usually suffers from sharp reduction of breakdown strength, which is detrimental to substantial increase of energy storage capability. Herein, the combination of bio-inspired fluoro-polydopamine functionalized BaTiO3 nanowires (NWs) and a fluoropolymer matrix offers a new thought to prepare polymer nanocomposites...
February 13, 2017: ACS Applied Materials & Interfaces
Ming-Bang Wu, Hao-Cheng Yang, Jing-Jing Wang, Guang-Peng Wu, Zhi-Kang Xu
A Janus membrane with opposing wettability was first reported with both function of water-to-oil and oil-to-water emulsification. This membrane is conveniently fabricated by single-surface deposition of polydopamine/polyethylenimine (PDA/PEI). The asymmetric wettability can also reduce the transmembrane resistance during the process, indicating an economical and promising strategy to prepare various emulsions. This research opens a novel avenue for exploring and understanding the Janus membrane, and provides a perspective to design the asymmetric membrane structures with promoted performance in conventional membrane processes...
February 2, 2017: ACS Applied Materials & Interfaces
Seonki Hong, Ki Soo Park, Ralph Weissleder, Cesar M Castro, Hakho Lee
We herein report a biomimetic technique to modify plastic substrates for bioassays. The method first places a polydopamine adhesion layer to plastic surface, and then grows conformal silica coating. As proof of principle, we coated plastic microbeads to construct a disposable filter for point-of-care nucleic acid extraction.
February 9, 2017: Chemical Communications: Chem Comm
Xiaohui Xu, Bo Bai, Honglun Wang, Yourui Suo
Controlled stimuli-responsive release systems are a feasible and effective way to increase the efficiency of pesticides and help improve environmental pollution issues. However, NIR-responsive systems for encapsulation of pesticides for controlling release have not been reported because of high cost and load ability of conventional NIR absorbers as well as complicated preparation process. Herein, we proposed polydopamine (PDA) microspheres as a photothermal agent owing to their abundant active sites, satisfactory photothermal efficiency, low cost and easy fabrication, followed by capping with a PNIPAm thermosensitive polymer shell...
January 26, 2017: ACS Applied Materials & Interfaces
Liying Zhang, Ming Liu, Shuguang Bi, Liping Yang, Sunanda Roy, Xiu-Zhi Tang, Chenzhong Mu, Xiao Hu
3D graphene foam was recently demonstrated to exhibit excellent electromagnetic interference (EMI) shielding performance. In this work, we prepared 3D graphene foams by incorporating a surface modification process of graphene via self-polymerization of dopamine with a subsequent foaming process. The multiple roles played by polydopamine (PDA), including as nitrogen doping source and as an enhancement tool to achieve higher extent of reduction of the graphene through providing wider pathways and larger accessible surface areas were discussed in detail...
January 16, 2017: Journal of Colloid and Interface Science
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