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Maryam Khan, Qayyum Husain, Rani Bushra
The present study aimed to work out a high yield procedure for immobilization of Aspergillus oryzae β-galactosidase on polyaniline cobalt multiwalled carbon nanotubes nanocomposite (PANI/Co/MWCNTNC) by physical adsorption and covalent attachment via glutaraldehyde. The binding was confirmed by scanning and transmission electron microscopy along with Fourier transform-infrared spectroscopy. The immobilization yields obtained for adsorbed and cross-linked enzymes were 93% and 97%, respectively. The covalently immobilized enzyme was remarkably more stable at extremes of pH and temperature compared to native and adsorbed enzymes...
July 19, 2017: International Journal of Biological Macromolecules
Wenyun Li, Qingwen Lin, Mengfan Gao, Hongzhu Ma
Modification of bentonite is essential for the adsorption of anionic dyes, as its negative surface charge. In this study, polyaniline/bentonite (PAni-Bent) nanocomposite was synthesized by in-situ intercalative polymerization technique and used to remove anionic dye Orange II (ORII) from synthetic wastewater. Its structure was confirmed by X-ray diffraction (XRD), scanning electron microscopy, Fourier-transform infrared spectra and Brunauer-Emmett-Teller specific surface area measurements. The adsorption behaviours of PAni-Bent towards ORII in the single anionic dye wastewater, the cationic/anionic mixture dye wastewater, with or without salt or surfactant, were investigated principally...
July 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Tianjing Wu, Hongshuai Hou, Chenyang Zhang, Peng Ge, Zhaodong Huang, Mingjun Jing, Xiaoqing Qiu, Xiaobo Ji
Antimony represents a class of unique functional materials in sodium-ion batteries with high theoretical capacity (660 mAh g-1). The utilization of carbonaceous materials as buffer layer has been considered as an effective approach to alleviate rapid capacity fading. Herein, the antimony/nitrogen-doping porous carbon (Sb/NPC) composite with polyaniline nanosheets as carbon source has been successfully achieved. And, our strategy involves three processes-tunable organic polyreaction, thermal annealing process and cost-effective reduction reaction...
July 19, 2017: ACS Applied Materials & Interfaces
Na Liu, Yan Li Su, Zhiqiang Wang, Zhen Wang, Jinsong Xia, Yong Chen, Zhigang Zhao, Qingwen Li, Fengxia Geng
A three-dimensional (3D) macroscopic network of manganese oxide MnO2 sheets was firstly synthesized by an easily scalable solution approach, grafting the negatively charged surfaces of the MnO2 sheets with an aniline monomer by electrostatic interactions followed by a quick chemical oxidizing polymerization reaction. The obtained structure possessed MnO2 sheets interconnected with polyaniline chains, producing a 3D monolith rich of mesopores. The MnO2 sheets had almost all their reactive centers exposed on the electrode surface, combining with the electron transport highways provided by polyaniline and the shortened diffusion paths provided by the porous structure, the deliberately designed electrode achieved excellent capacitance of 762 F g-1 at a current of 1 A g-1 and cycling performance with a capacity retention of 90% over 8000 cycles...
July 18, 2017: ACS Nano
Hyunjoon Lee, Min Jeong Kim, Taeho Lim, Yung-Eun Sung, Hyun-Jong Kim, Ho-Nyun Lee, Oh Joong Kwon, Yong-Hun Cho
The development of a low cost and highly active alternative to the commercial Pt/C catalysts used in the oxygen reduction reaction (ORR) requires a facile and environmentally-friendly synthesis process to facilitate large-scale production and provide an effective replacement. Transition metals, in conjunction with nitrogen-doped carbon, are among the most promising substitute catalysts because of their high activity, inexpensive composition, and high carbon monoxide tolerance. We prepared a polyaniline-derived Fe-N-C catalyst for oxygen reduction using a facile one-pot process with no additional reagents...
July 14, 2017: Scientific Reports
Indu Chanchal Polpaya, C Lakshmana Rao, Susy Varughese
Above their 'percolation threshold', intrinsically conducting polymer (ICP) based composites exhibit an increase or decrease in conductivity with strain. However, in this study we report an increase in conductivity and an associated insulator-to-conductor transition observed in certain conducting polymer composites below their percolation threshold under uniaxial tensile strain, thereby shifting the percolation to lower volume fractions. The 'auxetic behaviour' possible in certain types of 'hierarchical' microstructures is shown to be responsible for such changes in the polyaniline (PANI) composites studied...
July 14, 2017: Physical Chemistry Chemical Physics: PCCP
Bin Mu, Jie Tang, Long Zhang, Aiqin Wang
Using graphene as adsorbent for removal of pollutants from polluted water is commonly recognized to be costly because the graphene is usually produced by a very complex process. Herein, a simple and eco-friendly method was employed to fabricate efficient superparamagnetic graphene/polyaniline/Fe3O4 nanocomposites for removal of dyes. The exfoliation of graphite as nanosheets and the functionalization of nanosheets with polyaniline and Fe3O4 nanoparticles were simultaneously achieved via a one-pot reaction process combining the intercalation polymerization of aniline and the co-precipitation of the residual Fe(3+) and the generated Fe(2+)...
July 13, 2017: Scientific Reports
Ling Yu, Qianqian Wang, Hui Yang, Qilong Zhang, Zhongkuan Luo
In this study, ternary composites of reduced graphene oxide/molybdenum disulfide/polyaniline (rGEO/MoS2/PANI) were prepared via a two-stage facile synthesis including a hydrothermal reaction and polymerization at room temperature which makes the materials much easier for industrialization. The doping of reduced graphene oxide (rGEO) decreases the aggregation of MoS2 and enhances the electronic conductivities of MoS2, thus exhibiting better capacitance properties (531 F g(-1) at 1 A g(-1)) and cycling stabilities (86...
July 12, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Hyun-Ouk Kim, Minjoo Yeom, Jihye Kim, Aastha Kukreja, Woonsung Na, Jihye Choi, Aram Kang, Dayeon Yun, Jong-Woo Lim, Daesub Song, Seungjoo Haam
Reactive oxygen species (ROS) produced during mitochondrial oxidative phosphorylation play an important role as signal messengers in the immune system and also regulate signal transduction. ROS production, initiated as a consequence of microbial invasion, if generated at high levels, induces activation of the MEK (mitogen-activated protein kinase kinase)/ERK (extracellular signal-regulated kinase) pathway to promote cell survival and proliferation. However, viruses hijack the host cells' pathways, causing biphasic activation of the MEK/ERK cascade...
July 10, 2017: Small
Jiantie Xu, Javeed Mahmood, Yuhai Dou, Shixue Dou, Feng Li, Liming Dai, Jong-Beom Baek
Novel layered 2D frameworks (C3 N and C2 N-450) with well-defined crystal structures are explored for use as anode materials in lithium-ion batteries (LIBs) for the first time. As anode materials for LIBs, C3 N and C2 N-450 exhibit unusual electrochemical characteristics. For example, C2 N-450 (and C3 N) display high reversible capacities of 933.2 (383.3) and 40.1 (179.5) mAh g(-1) at 0.1 and 10 C, respectively. Furthermore, C3 N shows a low hypothetical voltage (≈0.15 V), efficient operating voltage window with ≈85% of full discharge capacity secured at >0...
July 10, 2017: Advanced Materials
Yuriy Y Smolin, Masoud Soroush, Kenneth K S Lau
Polyaniline (PANI) is synthesized via oxidative chemical vapor deposition (oCVD) using aniline as monomer and antimony pentachloride as oxidant. Microscopy and spectroscopy indicate that oCVD processing conditions influence the PANI film chemistry, oxidation, and doping level. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) indicate that a substrate temperature of 90 °C is needed to minimize the formation of oligomers during polymerization...
2017: Beilstein Journal of Nanotechnology
Mengyao Zhang, Baolin Guo
Silk fibroin (SF) with good biocompatibility and degradability has great potential for tissue engineering. However, the SF based scaffolds lack the electroactivity to regulate the myogenic differentiation for the regeneration of muscle tissue, which is sensitive to electrical signal. Herein, a series of electroactive biodegradable scaffolds based on SF and water-soluble conductive poly(aniline-co-N-(4-sulfophenyl) aniline) (PASA) via a green method for skeletal muscle tissue engineering are designed. SF/PASA scaffolds are prepared by vortex of aqueous solution of SF and PASA under physiological condition...
July 3, 2017: Macromolecular Bioscience
Junaid Ali Syed, Shaochun Tang, Xiangkang Meng
The wetting characteristic of a metal surface can be controlled by employing different coating materials and external stimuli, however, layer number (n) modulated surface swapping between hydrophobicity and hydrophilicity in a multilayer structure to achieve prolonged anti-corrosion ability was not taken into consideration. In this study, we proposed a layer-by-layer (LbL) spin assembled polyaniline-silica composite/tetramethylsilane functionalized silica nanoparticles (PSC/TMS-SiO2) coating with the combined effect of super-hydrophobicity and enhanced anti-corrosion ability...
June 30, 2017: Scientific Reports
Ling Wang, Yaobin Wu, Tianli Hu, Baolin Guo, Peter X Ma
Mimicking the nanofibrous structure similar to extracellular matrix and conductivity for electrical propagation of native myocardium would be highly beneficial for cardiac tissue engineering and cardiomyocytes-based bioactuators. Herein, we developed conductive nanofibrous sheets with electrical conductivity and nanofibrous structure composed of poly(L-lactic acid) (PLA) blending with polyaniline (PANI) for cardiac tissue engineering and cardiomyocytes-based 3D bioactuators. Incorporating of varying contents of PANI from 0 wt% to 3 wt% into the PLA polymer, the electrospun nanofibrous sheets showed enhanced conductivity while maintaining the same fiber diameter...
June 26, 2017: Acta Biomaterialia
Md Mamun Or Rashid, Kazi Nahid Akhter, Jakir Ahmed Chowdhury, Foysal Hossen, Md Saddam Hussain, Md Tanvir Hossain
BACKGROUND: Our present study was conducted to characterize the phytoconstituents present in the aqueous extract of Momordica charantia and evaluate the antimicrobial efficacy of silver-extract nanoparticles (Ag-Extract-NPs). METHODS: Silver nanoparticles (AgNPs) were prepared by reducing AgNO3; and NaBH4 served as reducing agent. After screening of phytochemicals; AgNPs and aqueous extract were mixed thoroughly and then coated by polyaniline. These NPs were characterized by using Visual inspection, UV spectroscopy, FTIR, SEM and TEM techniques...
June 26, 2017: BMC Complementary and Alternative Medicine
Samapti Kundu, Biswarup Satpati, Tanusree Kar, Swapan Kumar Pradhan
Polyaniline intercalated vanadium oxide xerogel (PV) hybrid nanocomposite (NC) with novel structure has been successfully synthesized through a simple hydrothermal route. Detailed structure and microstructure characterization of PV NC is illustrated through Rietveld refinement of XRD data and FESEM/HRTEM images. Both FTIR and XPS spectra confirm the presence of PANI and water molecules within the NC and partial reduction of V(5+) to V(4+), corroborating with the results of XRD pattern analysis. Core-shell structure of PV NC, where PANI sheath layer acts as a shell covering around V2O5·nH2O crystalline core is confirmed from HRTEM images...
June 17, 2017: Journal of Hazardous Materials
Suradip Das, Manav Sharma, Dhiren Saharia, Kushal Sarma, Elizabeth Muir, Utpal Bora
The present study describes the fabrication of polyaniline-silk fibroin nanocomposite based nerve conduits and its subsequent implantation in a rat sciatic nerve injury model for peripheral nerve regeneration. This is the first in vivo study of polyaniline based nerve conduit describing the safety and efficacy of the conduits in treating peripheral nerve injuries. The nanocomposite was synthesised by electrospinning a mixture of silk fibroin protein and polyaniline wherein the silk nanofibers were observed to be uniformly coated with polyaniline nanoparticles...
June 20, 2017: Biomedical Materials
Ana S Sacramento, Felismina T C Moreira, Joana L Guerreiro, Ana P Tavares, M Goreti F Sales
This work describes a novel approach to produce an antibody-like biomimetic material. It includes preparing composite imprinted material never presented before, with highly conductive support nanostructures and assembling a high conductivity polymeric layer at low temperature. Overall, such highly conductive material may enhance the final features of electrically-based devices. Acetylcholine (ACh) was selected as target analyte, a neurotransmitter of importance in Alzheimer's disease. Potentiometric transduction was preferred, allowing quick responses and future adaptation to point-of-care requirements...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Angel T Martínez, Francisco J Ruiz-Dueñas, Susana Camarero, Ana Serrano, Dolores Linde, Henrik Lund, Jesper Vind, Morten Tovborg, Owik M Herold-Majumdar, Martin Hofrichter, Christiane Liers, René Ullrich, Katrin Scheibner, Giovanni Sannia, Alessandra Piscitelli, Cinzia Pezzella, Mehmet E Sener, Sibel Kılıç, Willem J H van Berkel, Victor Guallar, Maria Fátima Lucas, Ralf Zuhse, Roland Ludwig, Frank Hollmann, Elena Fernández-Fueyo, Eric Record, Craig B Faulds, Marta Tortajada, Ib Winckelmann, Jo-Anne Rasmussen, Mirjana Gelo-Pujic, Ana Gutiérrez, José C Del Río, Jorge Rencoret, Miguel Alcalde
Fungi produce heme-containing peroxidases and peroxygenases, flavin-containing oxidases and dehydrogenases, and different copper-containing oxidoreductases involved in the biodegradation of lignin and other recalcitrant compounds. Heme peroxidases comprise the classical ligninolytic peroxidases and the new dye-decolorizing peroxidases, while heme peroxygenases belong to a still largely unexplored superfamily of heme-thiolate proteins. Nevertheless, basidiomycete unspecific peroxygenases have the highest biotechnological interest due to their ability to catalyze a variety of regio- and stereo-selective monooxygenation reactions with H2O2 as the source of oxygen and final electron acceptor...
June 14, 2017: Biotechnology Advances
Remya Komeri, Jayabalan Muthu
The injectable electroconductive hydrogels are desirable for the regenerative therapy of electroresponsive tissues like heart. With the present electroconductive hydrogels, the issues of cytotoxicity, biodegradability, and diffusion of the conductive element and poor water solubility limit their applications. Here, electroconductive injectable single component hydrogels, PANIE-P/PEGDA and PANIS-P/PEGDA, are prepared with fumarate-co-PEG-co-sebacate comacromer conjugated with non-sulfonated/sulfonated polyaniline and PEGDA...
June 1, 2017: Colloids and Surfaces. B, Biointerfaces
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