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ACS applied materials & interfaces 92건

  1. [해외논문]   Diamond-Graphite Nanoplatelet Surfaces as Conductive Substrates for the Electrical Stimulation of Cell Functions   SCI SCIE

    Santos, N. F. (i3N and Physics Department, University of Aveiro, 3810-193 Aveiro, ) , Cicué (TEMA-NRG, Mechanical Engineering Department and CICECO-Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, ) , ndez, M. (i3N and Physics Department, University of Aveiro, 3810-193 Aveiro, ) , Holz, T. (CESAM, Biology Department, University of Aveiro, 3810-193 Aveiro, ) , Silva, V. S. (i3N and Physics Department, University of Aveiro, 3810-193 Aveiro, ) , Fernandes, A. J. S. (TEMA-NRG, Mechanical Engineering Department, University of Aveiro, 3810-193 Aveiro, ) , Vila, M. (i3N and Physics Department, University of Aveiro, 3810-193 Aveiro,) , Costa, F. M.
    ACS applied materials & interfaces v.9 no.2 ,pp. 1331 - 1342 , 2017 , 1944-8244 ,

    초록

    The nanocarbon allotropes constitute valid alternatives when designing control and actuation devices for electrically assisted tissue regeneration purposes, gathering among them important characteristics such as chemical inertness, biocompatibility, extreme mechanical properties, and, importantly, low and tailorable electrical resistivity. In this work, coatings of thin (100 nm) vertically aligned nanoplatelets composed of diamond (5 nm) and graphite were produced via a microwave plasma chemical vapor deposition (MPCVD) technique and used as substrates for electrical stimulation of MC3T3-E1 preosteoblasts. Increasing the amount of N 2 up to 14.5 vol % during growth lowers the coatings’ electrical resistivity by over 1 order of magnitude, triggers the nanoplatelet vertical growth, and leads to the higher crystalline quality of the nanographite phase. When preosteoblasts were cultured on these substrates and subjected to two consecutive daily cycles of 3 μA direct current stimulation, enhanced cell proliferation and metabolism were observed accompanied by high cell viability. Furthermore, in the absence of DC stimulation, alkaline phosphatase (ALP) activity is increased significantly, denoting an up-regulating effect of preosteoblastic maturation intrinsically exerted by the nanoplatelet substrates. Graphic Abstract

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  2. [해외논문]   Wrinkled Surface-Mediated Antibacterial Activity of Graphene Oxide Nanosheets   SCI SCIE

    Zou, Fengming (Department of Cogno-Mechatronics Engineering, Pusan National University, Busan 46241, ) , Zhou, Hongjian (Department of Cogno-Mechatronics Engineering, Pusan National University, Busan 46241, ) , Jeong, Do Young (ACI Process & Structure Development Group, Samsung Electro-Mechanics, Suwon 16674, ) , Kwon, Junyoung (Department of Cogno-Mechatronics Engineering, Pusan National University, Busan 46241, ) , Eom, Seong Un (Department of Cogno-Mechatronics Engineering, Pusan National University, Busan 46241, ) , Park, Tae Jung (Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, ) , Hong, Suck Won (Department of Cogno-Mechatronics Engineering, Pusan National University, Busan 46241, ) , Lee, Jaebeom (Department of Cogno-Mechatronics Engineering, Pusan National University, Busan 46241,)
    ACS applied materials & interfaces v.9 no.2 ,pp. 1343 - 1351 , 2017 , 1944-8244 ,

    초록

    Surface wrinkles are commonly observed in large-scale of graphene films. As a new feature, the wrinkled surface of graphene films may directly affect bacterial viability by means Of various interactions of bacterial cells with graphene sheets. In the present study, we introduce a wrinkled surface geometry of graphene oxide (GO) thin films for antibacterial application. Highly wrinkled GO films were formed by vacuum filtration of a GO suspension through a prestrained filter. Several types of wrinkled GO surfaces were obtained with different roughness grades determined by root-mean-square values. Antibacterial activity of the fabricated GO films toward three different bacterial species, Escherichia coli, Mycobacterium smegmatis, and Staphylococcus aureus, was evaluated in relation to surface roughness. Because of their nanosoopically corrugated nature, the wrinkled GO films exhibited excellent antibacterial properties. On the basis of our detailed observations; we propose a novel concept of the surrounded contact-based mechanism for antimicrobial activity of wrinkled GO films. It postulates formation of a mechanically robust GO surface "trap" that prompts interaction of bacteria with the diameter-matched GO sink, which results in substantial damages to the bacterial cell membrane. We believe that our approach uncovered a novel use of a promising two-dimensional material for highly effective antibacterial treatment.

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  3. [해외논문]   Multicopper Laccase Mimicking Nanozymes with Nucleotides as Ligands   SCI SCIE

    Liang, Hao (State key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, ) , Lin, Feifei (State key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, ) , Zhang, Zijie (Department of Chemistry and Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario N2L 3G1, ) , Liu, Biwu (Department of Chemistry and Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario N2L 3G1, ) , Jiang, Shuhui (State key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, ) , Yuan, Qipeng (State key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, ) , Liu, Juewen (Department of Chemistry and Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario N2L 3G1,)
    ACS applied materials & interfaces v.9 no.2 ,pp. 1352 - 1360 , 2017 , 1944-8244 ,

    초록

    Using nanomaterials to achieve functional enzyme mimics (nanozymes) is attractive for both applied and fundamental research. Laccases are multicopper oxidases highly important for biotechnology and environmental remediation. In this work, we report an exceptionally simple yet functional laccase mimic based on guanosine monophosphate (GMP) coordinated copper. It forms an amorphous metal–organic framework (MOF) material. The ratio of copper and GMP is 3:4 as determined by isothermal titration calorimetry. It has excellent laccase-like activity and converts a diverse range of phenol containing substrates such as hydroquinone, naphthol, catechol and epinephrine. Comparative work shows that the activity is originated from guanosine coordination instead of phosphate binding in GMP. Cu 2+ is required and cannot be substituted by other metal ions. At the same mass concentration, the Cu/GMP nanozyme has a higher V max and similar K m compared to the protein laccase. To achieve the same catalytic efficiency, the cost of the Gu/GMP is ∼2400-fold lower than that of laccase. The Cu/GMP is much more stable at extreme pH, high salt, high temperature and for long-term storage. This is one of the first laccase-mimicking nanozymes, which will find important applications in analytical chemistry, environmental protection, and biotechnology. Graphic Abstract ACS Electronic Supporting Info

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  4. [해외논문]   Construction of PLGA Nanoparticles Coated with Polycistronic SOX5, SOX6, and SOX9 Genes for Chondrogenesis of Human Mesenchymal Stem Cells   SCI SCIE

    Park, Ji Sun , Yi, Se Won , Kim, Hye Jin , Kim, Seong Min , Kim, Jae-Hwan , Park, Keun-Hong
    ACS applied materials & interfaces v.9 no.2 ,pp. 1361 - 1372 , 2017 , 1944-8244 ,

    초록

    Transfection of a cocktail of genes into cells has recently attracted attraction in stem cell differentiation. However) it is not easy to control the transfection rate of each gene. To control and regulate gene delivery into human mesenchymal stem cells (hMSCs), we employed multicistronic genes coupled with a nonviral gene carrier system for stem cell differentiation. Three genes, SOX5, SOX6, and SOX9, were successfully fabricated in a single plasmid. This multicistronic plasmid was complexed with the polycationic polymer polyethylenimine, and poly(lactic-co-glycolic) acid (PLGA) nanoparticles were coated with this complex. The uptake of PLGA nanoparticles complexed with the multicistronic plasmid was tested first. Thereafter, transfection of SOXS, SOX6, and SOX9 was evaluated, which increased the potential for chondrogenesis of hMSCs. The expression of specific genes triggered by transfection of SOXS, SOX6, and SOX9 was tested by RT-PCR and real-time qPCR Furthermore, specific proteins related to chondrocytes were investigated by a glycosaminoglycan/DNA assay, Western blotting, histological analyses, and immunofluorescence staining. These methods demonstrated that chondrogenesis of hMSCs treated with PLGA nanoparticles carrying this multicistronic genes was better than that of hMSCs treated with other carriers. Furthermore) the multicistronic genes complexed with PLGA nanoparticles were more simple than that of each single gene complexation with PLGA nanoparticles. Multicistronic genes showed more chondrogenic differentiation than each single gene transfection methods.

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  5. [해외논문]   Feasibility Study Exploring the Potential of Novel Battacin Lipopeptides as Antimicrobial Coatings   SCI SCIE

    De Zoysa, Gayan Heruka , Sarojini, Vijayalekshmi
    ACS applied materials & interfaces v.9 no.2 ,pp. 1373 - 1383 , 2017 , 1944-8244 ,

    초록

    Colonization of medical implant surfaces by pathogenic microorganisms causes implant failure and undermines their clinical applicability. Alarming increase in multidrug-resistant bacteria poses serious concerns with the use of medical implants. Antimicrobial peptides (AMPs) that form part of the innate immune system in all forms of life are attractive alternatives to conventional antibiotics to treat multidrug-resistant bacterial biofilms. The aim of this study was to assess the in vitro antibacterial potency of our recently discovered lipopeptides from the battacin family upon immobilization to various surfaces. To achieve this, glass, silicon, and titanium surfaces were functionalized through silanization followed by addition of the heterobifunctional cross-linker, succinimidyl-[ N -maleimidopropionamido]-poly(ethylene glycol) ester to generate maleimide-functionalized surfaces. The lipopeptide, GZ3.27, with an added N-terminal cysteine was covalently coupled to the surfaces via a thioether bond through a Michael-type addition between the cysteine sulfhydryl group and the maleimide moiety. Success of surface immobilization and antimicrobial activity of the coated surfaces was assessed using water contact angle measurements, X-ray photoelectron spectroscopy, ellipsometry, scanning electron microscopy, colony forming unit assays and biofilm analysis. The lipopeptide-coated surfaces caused significant damage to the cellular envelop of Pseudomonas aeruginosa ( P. aeruginosa ) and Escherichia coli ( E. coli ) upon contact and prevented surface colonization by P. aeruginosa and E. coli biofilms. The lipopeptides investigated in this study were not hemolytic to mouse blood cells in solution. Findings from this study indicate that these lipopeptides have the potential to be developed as promising antimicrobial coatings on medical implants. Graphic Abstract ACS Electronic Supporting Info

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  6. [해외논문]   Bioengineered Osteoinductive Broussonetia kazinoki/Silk Fibroin Composite Scaffolds for Bone Tissue Regeneration   SCI SCIE

    Kim, Do Kyung (Department of BIN Convergence Technology, Department of Polymer Nano Science & Technology and Polymer BIN Research Center, Chonbuk National University, Deokjin-gu, Jeonju 561-756, ) , Kim, Jeong In (Department of Bionanosystem Engineering, Graduate School, Chonbuk National University, Jeonju 561-756, ) , Hwang, Tae In (Department of Bionanosystem Engineering, Graduate School, Chonbuk National University, Jeonju 561-756, ) , Sim, Bo Ra (Department of BIN Convergence Technology, Department of Polymer Nano Science & Technology and Polymer BIN Research Center, Chonbuk National University, Deokjin-gu, Jeonju 561-756, ) , Khang, Gilson (Department of BIN Convergence Technology, Department of Polymer Nano Science & Technology and Polymer BIN Research Center, Chonbuk National University, Deokjin-gu, Jeonju 561-756,)
    ACS applied materials & interfaces v.9 no.2 ,pp. 1384 - 1394 , 2017 , 1944-8244 ,

    초록

    In this article, Broussonetia kazinoki (BK) powdery extract is utilized to modify the silk fibroin (SF) scaffold and applied to the bone defect area. The BK/SF scaffold is an efficient cell carrier which promotes cell proliferation and osteogenic differentiation of rBMSCs (bone marrow derived mesenchymal stem cells). We confirmed biocompatibility and osteogenic differentiation capacity of BK/SF scaffolds compared to pristine. SF scaffold in both in vitro and in vivo evaluation. Gene expression related to osteogenic differentiation and bone regeneration significantly upregulated in the BK/SF scaffold group. The implanted scaffolds were attached well to the surface of the bone defect region and integrated with surrounding tissues without significant inflammatory reaction. Furthermore, almost 45% of bone volume has been recovered at 8 weeks postsurgery, while the SF and control group showed 20% recovery. These results suggest that BK powdery extract incorporated with an SF scaffold might be a suitable substitute for an alternative bone graft for bone regeneration.

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  7. [해외논문]   Electrostatic-Induced Assembly of Graphene-Encapsulated Carbon@Nickel–Aluminum Layered Double Hydroxide Core–Shell Spheres Hybrid Structure for High-Energy and High-Power-Density Asymmetric Supercapacitor   SCI SCIE

    Wu, Shuxing (Department of Materials Science and Engineering, Pusan National University, San 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735, ) , Hui, Kwan San (School of Mathematics, University of East Anglia, Norwich NR4 7TJ, ) , Hui, Kwun Nam (Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Macau, ) , Kim, Kwang Ho (Department of Materials Science and Engineering, Pusan National University, San 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735,)
    ACS applied materials & interfaces v.9 no.2 ,pp. 1395 - 1406 , 2017 , 1944-8244 ,

    초록

    Achieving high energy density while retaining high power density is difficult in electrical double-layer capacitors and in pseudocapacitors considering the Origin of different charge storage mechanisms. Rational structural design became an appealing strategy in circumventing these tradeoffs between energy and power densities. A hybrid:structure consists of chemically converted graphene-encapsiilated carbon@nickel-aluminum layered double hydroxide core shell spheres as spacers among graphene layers (G-CLS) used as an,advanced electrode to achieve high energy density while retaining high power density for high-performance supercapacitors. The merits of the proposed architecture are as follows: (1) CLS act as spacers to avoid the close restacking of graphene; (2)-highly conductive carbon sphere and graphene preserve the mechanical integrity and improve the electrical Conductivity of LDHs hybrid. the proposed hybrid structure can simultaneously achieve high electrical-double-layer capacitance and pseudocapacitance resulting in the overall highly active electrode. The G-CLS electrode exhibited high specific capacitance (1710.5 F g(-1) at 1 A g(-1)) under three-electrode tests. An ASC fabricated using the G-CLS as positive electrode and reduced graphite oxide as negative electrode demonstrated remarkable electrochemical performance. The ASC device operated at 1.4 V and delivered a high energy density of 35:5 Wh kg(-1) at a 670.7 W kg(-1) power density at 1 A g(-1) with an excellent rate capability as well as a robust long-term cycling stability of up to 10 000 cycles.

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  8. [해외논문]   Three-Dimensional Interconnected Spherical Graphene Framework/SnS Nanocomposite for Anode Material with Superior Lithium Storage Performance: Complete Reversibility of Li2S   SCI SCIE

    Zhao, Bing (School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, ) , Wang, Zhixuan (School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, ) , Chen, Fang (School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, ) , Yang, Yaqing (School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, ) , Gao, Yang (School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, ) , Chen, Lu (School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, ) , Jiao, Zheng (School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, ) , Cheng< (School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444,) , sup> , ‡< , /sup> , , Lingli , Jiang, Yong
    ACS applied materials & interfaces v.9 no.2 ,pp. 1407 - 1415 , 2017 , 1944-8244 ,

    초록

    Three-dimensional (3D) interconnected spherical graphene framework-decorated SnS nanoparticles (3D SnS@SG) is synthesized by self-assembly of graphene oxide nanosheets and positively charged polystyrene/SnO 2 nanospheres, followed by a controllable in situ sulfidation reaction during calcination. The SnS nanoparticles with diameters of ∼10–30 nm are anchored to the surface of the spherical graphene wall tightly and uniformly. Benefiting from the 3D interconnected spherical graphene framework and subtle SnS nanoparticles, the generated Li 2 S could keep in close contact with Sn to make possible the in situ conversion reaction SnS + 2Li + + 2e – ↔ Sn + Li 2 S. As a result, the 3D SnS@SG as the anode material for lithium ion batteries shows a high initial Coulombic efficiency of 75.3%. Apart from the irreversible capacity loss of 3D spherical graphene, the initial Coulombic efficiency of SnS in the 3D SnS@SG composite is as high as 99.7%, demonstrating the almost complete reversibility of Li 2 S in this system. Furthermore, it also exhibits an excellent reversible capacity (800 mAh g –1 after 100 cycles at 0.1 C and 527.1 mAh g –1 after 300 cycles at 1 °C) and outstanding rate capability (380 mAh g –1 at 5 °C). Graphic Abstract ACS Electronic Supporting Info

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  9. [해외논문]   Na2Ti3O7 Nanoplatelets and Nanosheets Derived from a Modified Exfoliation Process for Use as a High-Capacity Sodium-Ion Negative Electrode   SCI SCIE

    Ko, Jesse S. (Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, California 90095, ) , Doan-Nguyen, Vicky V. T. (California NanoSystems Institute, University of California, Santa Barbara, Santa Barbara, California 93106, ) , Kim, Hyung-Seok (Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, California 90095, ) , Muller, Guillaume A. (Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, California 90095, ) , Serino, Andrew C. (Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, California 90095, ) , Weiss, Paul S. (Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, California 90095, ) , Dunn, Bruce S. (Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, California 90095,)
    ACS applied materials & interfaces v.9 no.2 ,pp. 1416 - 1425 , 2017 , 1944-8244 ,

    초록

    The increasing interest in Na-ion batteries (NIBs) can be traced to sodium abundance, its low cost compared to lithium, and its intercalation chemistry being similar to that of lithium. We report that the electrochemical properties of a promising negative electrode material, Na 2 Ti 3 O 7 , are improved by exfoliating its layered structure and forming 2D nanoscale morphologies, nanoplatelets, and nanosheets. Exfoliation of Na 2 Ti 3 O 7 was carried out by controlling the amount of proton exchange for Na + and then proceeding with the intercalation of larger cations such as methylammonium and propylammonium. An optimized mixture of nanoplatelets and nanosheets exhibited the best electrochemical performance in terms of high capacities in the range of 100–150 mA h g –1 at high rates with stable cycling over several hundred cycles. These properties far exceed those of the corresponding bulk material, which is characterized by slow charge-storage kinetics and poor long-term stability. The results reported in this study demonstrate that charge-storage processes directed at 2D morphologies of surfaces and few layers of sheets are an exciting direction for improving the energy and power density of electrode materials for NIBs. Graphic Abstract ACS Electronic Supporting Info

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  10. [해외논문]   Ionic Conductor of Li2SiO3 as an Effective Dual-Functional Modifier To Optimize the Electrochemical Performance of Li4Ti5O12 for High-Performance Li-Ion Batteries   SCI SCIE

    Bai, Xue (Key Laboratory for Liquid−Solid Structural Evolution & Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, ) , Li, Tao (Department of Informatics, Bioengineering, Robotics, System Engineering (DIBRIS), University of Genova, via Balbi 5, Genova 16126, ) , Dang, Zhiya (Key Laboratory for Liquid−Solid Structural Evolution & Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, ) , Qi, Yong-Xin (Key Laboratory for Liquid−Solid Structural Evolution & Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, ) , Lun, Ning (Key Laboratory for Liquid−Solid Structural Evolution & Processing of Materials (Ministry of Education), Shandong University, Jinan 250061,) , Bai, Yu-Jun
    ACS applied materials & interfaces v.9 no.2 ,pp. 1426 - 1436 , 2017 , 1944-8244 ,

    초록

    Ionic conductor of Li 2 SiO 3 (LSO) was used as an effective modifier to fabricate surface-modified Li 4 Ti 5 O 12 (LTO) via simply mixing followed by sintering at 750 °C in air. The electrochemical performance of LTO was enhanced by merely adjusting the mass ratio of LTO/LSO, and the LTO/LSO composite with 0.51 wt % LSO exhibited outstanding rate capabilities (achieving reversible capacities of 163.8, 157.6, 153.1, 147.0, and 137.9 mAh g –1 at 100, 200, 400, 800, and 1600 mA g –1 , respectively) and remarkable long-term cycling stability (120.2 mAh g –1 after 2700 cycles with a capacity fading rate of only 0.0074% per cycle even at 500 mA g –1 ). Combining structural characterization with electrochemical analysis, the LSO coating coupled with the slight doping effect adjacent to the LTO surface contributes to the enhancement of both electronic and ionic conductivities of LTO. Graphic Abstract ACS Electronic Supporting Info

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