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Polyaniline nanofibers

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https://www.readbyqxmd.com/read/28427673/sonocatalytic-rapid-degradation-of-congo-red-dye-from-aqueous-solution-using-magnetic-fe-0-polyaniline-nanofibers
#1
Raghunath Das, Madhumita Bhaumik, Somnath Giri, Arjun Maity
Nano-sized magnetic Fe(0)/polyaniline (Fe(0)/PANI) nanofibers were used as an effective material for sonocatalytic degradation of organic anionic Congo red (CR) dye. Fe(0)/PANI, was synthesized via reductive deposition of nano-Fe(0) onto the PANI nanofibers at room temperature. Prepared catalyst was characterized using HR-TEM, FE-SEM, XRD, FTIR instruments. The efficacy of catalyst in removing CR was assessed colorimetrically using UV-visible spectroscopy under different experimental conditions such as % of Fe(0) loading into the composite material, solution pH, initial concentration of dye, catalyst dosage, temperature and ultrasonic power...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28422044/design-of-flexible-pani-coated-cuo-tio2-sio2-heterostructure-nanofibers-with-high-ammonia-sensing-response-values
#2
Zengyuan Pang, Qingxin Nie, Pengfei Lv, Jian Yu, Fenglin Huang, Qufu Wei
We report a room temperature ammonia sensor with extra high response values and ideal flexibility, including polyaniline (PANI) coated titanium dioxide- silicon dioxide (TiO2-SiO2) or copper oxide- titanium dioxide- silicon dioxide (CuO-TiO2-SiO2) composite nanofibers. Such flexible inorganic TiO2-SiO2 and CuO-TiO2-SiO2 composite nanofibers were prepared by electrospinning, followed by calcination. Then in situ polymerization of aniline monomers was operated with inorganic TiO2-SiO2 and CuO-TiO2-SiO2 composite nanofibers as templates...
April 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28414213/immobilization-and-stabilization-of-acylase-on-carboxylated-polyaniline-nanofibers-for-highly-effective-antifouling-application-via-quorum-quenching
#3
Jeongjoon Lee, Inseon Lee, Jahyun Nam, Dong Soo Hwang, Kyung-Min Yeon, Jungbae Kim
Acylase was immobilized and stabilized on carboxylated polyaniline nanofibers (cPANFs) for the development of antifouling nanobiocatalysis with high enzyme loading and stability. Acylase was immobilized via three different approaches: covalent attachment (CA), enzyme coating (EC), and magnetically separable enzyme precipitate coating (Mag-EPC). The enzyme activity per unit weight of cPANFs of Mag-EPC was 75 and 300 times higher than those of CA and EC, respectively, representing the improved enzyme loading in the form of Mag-EPC...
April 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28291246/hydrothermal-synthesis-of-nanostructured-graphene-polyaniline-composites-as-high-capacitance-electrode-materials-for-supercapacitors
#4
Ronghua Wang, Meng Han, Qiannan Zhao, Zonglin Ren, Xiaolong Guo, Chaohe Xu, Ning Hu, Li Lu
As known to all, hydrothermal synthesis is a powerful technique for preparing inorganic and organic materials or composites with different architectures. In this reports, by controlling hydrothermal conditions, nanostructured polyaniline (PANi) in different morphologies were composited with graphene sheets (GNS) and used as electrode materials of supercapacitors. Specifically, ultrathin PANi layers with total thickness of 10-20 nm are uniformly composited with GNS by a two-step hydrothermal-assistant chemical oxidation polymerization process; while PANi nanofibers with diameter of 50~100 nm are obtained by a one-step direct hydrothermal process...
March 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28098293/polyaniline-nanofibers-broadening-applications-for-conducting-polymers
#5
REVIEW
Christina O Baker, Xinwei Huang, Wyatt Nelson, Richard B Kaner
Polyaniline is a conducting polymer with incredible promise, but it has had limited use due to poor reaction control and processability associated with conventional morphologies. Polyaniline nanofibers, on the other hand, have demonstrated, through manufacturing techniques discovered during the past decade, increased processability, higher surface area, and improved consistency and stability in aqueous dispersions, which are finally allowing for expanded commercial development of this promising polymer. This review explores some intriguing applications of polyaniline nanofibers, as well as the advantages and remaining challenges in developing better products using polyaniline in this new morphology...
January 18, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28026927/pegylated-polyaniline-nanofibers-antifouling-and-conducting-biomaterial-for-electrochemical-dna-sensing
#6
Ni Hui, Xiaotian Sun, Shuyan Niu, Xiliang Luo
Biofouling arising from nonspecific adsorption is a substantial outstanding challenge in diagnostics and disease monitoring, and antifouling sensing interfaces capable of reducing the nonspecific adsorption of proteins from biological complex samples are highly desirable. We present herein the preparation of novel composite nanofibers through the grafting of polyethylene glycol (PEG) polymer onto polyaniline (PANI) nanofibers and their application in the development of antifouling electrochemical biosensors...
January 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28008893/controlled-synthesis-of-metallic-iron-nanoparticles-and-their-magnetic-hyperthermia-performance-in-polyaniline-composite-nanofibers
#7
Ta-I Yang, Su-Hua Chang
Electrospun magnetic iron/polyaniline nanofibers with applicable heating performance in an AC magnetic field were developed. A new and low-cost method was introduced to synthesize metallic iron (Fe(0)) nanoparticles with uniform size distribution. The Fe(0) nanoparticles were synthesized in an aqueous environment at room temperature with the assistance of polyvinylpyrrolidone and sodium citrate to tailor their particle sizes ranging from 10 to 20 nm. The experimental results showed that regulating the free iron ions present in the solution is critical for obtaining Fe(0) nanoparticles with narrow size distribution...
February 3, 2017: Nanotechnology
https://www.readbyqxmd.com/read/27916553/nio-hedgehog-like-nanostructures-au-polyaniline-nanofibers-reduced-graphene-oxide-nanocomposite-with-electrocatalytic-activity-for-non-enzymatic-detection-of-glucose
#8
Kh Ghanbari, F Ahmadi
A novel sensitive non-enzymatic glucose sensor was fabricated based on nickel oxide hedgehog-like nanostructures decorated ternary gold nanoparticles/polyaniline nanofibers/reduced graphene oxide nanocomposites (NiO/Au/PANI/rGO). The morphology and structure of NiO/Au/PANI/rGO nanocomposites were characterized by field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), Raman spectroscopy, and Fourier transform infrared (FT-IR). Electrochemical impedance spectroscopy (EIS) data also indicated the charge transfer of each layer decreased compared to the underneath layer...
February 1, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/27901141/assembly-of-1d-nanofibers-into-a-2d-bi-layered-composite-nanofibrous-film-with-different-functionalities-at-the-two-layers-via-layer-by-layer-electrospinning
#9
Zijiao Wang, Qianli Ma, Xiangting Dong, Dan Li, Xue Xi, Wensheng Yu, Jinxian Wang, Guixia Liu
A two-dimensional (2D) bi-layered composite nanofibrous film assembled by one-dimensional (1D) nanofibers with trifunctionality of electrical conduction, magnetism and photoluminescence has been successfully fabricated by layer-by-layer electrospinning. The composite film consists of a polyaniline (PANI)/Fe3O4 nanoparticle (NP)/polyacrylonitrile (PAN) tuned electrical-magnetic bifunctional layer on one side and a Tb(TTA)3(TPPO)2/polyvinylpyrrolidone (PVP) photoluminescent layer on the other side, and the two layers are tightly combined face-to-face together into the novel bi-layered composite film of trifunctionality...
December 21, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27882683/persistent-hydrogen-production-by-the-photo-assisted-microbial-electrolysis-cell-using-a-p-type-polyaniline-nanofiber-cathode
#10
Yongwon Jeon, Sunghyun Kim
A microbial electrolysis cell, though considered as a promising, environmentally friendly technology for hydrogen production, suffers from concomitant production of methane. The high hydrogen/methane ratio at the initial operation stage decreases with time. Here we report for the first time the photoassisted microbial electrolysis cell (MEC) for persistent hydrogen production using polyaniline nanofibers as a cathode. Under 0.8 V external bias and laboratory fluorescent light illumination in a single-chamber MEC, continuous hydrogen production from acetate at a rate of 1...
December 8, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27846987/synthesis-of-a-novel-electrode-material-containing-phytic-acid-polyaniline-nanofibers-for-simultaneous-determination-of-cadmium-and-lead-ions
#11
Hui Huang, Wencai Zhu, Xiaochun Gao, Xiuyu Liu, Houyi Ma
The development of nanostructured conducting polymers based materials for electrochemical applications has attracted intense attention due to their environmental stability, unique reversible redox properties, abundant electron active sites, rapid electron transfer and tunable conductivity. Here, a phytic acid doped polyaniline nanofibers based nanocomposite was synthesized using a simple and green method, the properties of the resulting nanomaterial was characterized by electrochemical impedance spectroscopy (EIS), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS)...
December 1, 2016: Analytica Chimica Acta
https://www.readbyqxmd.com/read/27826505/ammonia-gas-sensors-based-on-in2o3-pani-hetero-nanofibers-operating-at-room-temperature
#12
Qingxin Nie, Zengyuan Pang, Hangyi Lu, Yibing Cai, Qufu Wei
Indium nitrate/polyvinyl pyrrolidone (In(NO3)3/PVP) composite nanofibers were synthesized via electrospinning, and then hollow structure indium oxide (In2O3) nanofibers were obtained through calcination with PVP as template material. In situ polymerization was used to prepare indium oxide/polyaniline (In2O3/PANI) composite nanofibers with different mass ratios of In2O3 to aniline. The structure and morphology of In(NO3)3/PVP, In2O3/PANI composite nanofibers and pure PANI were investigated by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM) and current-voltage (I-V) measurements...
2016: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/27762544/enhancing-cycling-stability-of-aqueous-polyaniline-electrochemical-capacitors
#13
Luciano M Santino, Yang Lu, Shinjita Acharya, Liana Bloom, Daniel Cotton, Aly Wayne, Julio M D'Arcy
Electrochemical capacitors fabricated with polyaniline nanofibers are cycled 150 000 times with 98% capacitance retention. These devices maintain an energy density of 11.41 Wh/kg at a power density of 4000 W/kg, 64 times greater than that of an identically fabricated device based on activated carbon (0.177 Wh/kg at 4600 W/kg). For applications requiring a higher specific energy, 33.39 Wh/kg at a specific power of 600 W/kg is obtained by widening the voltage window; this device retains 93% capacitance after 10 000 cycles...
October 20, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27751695/improved-proliferation-and-osteogenic-differentiation-of-mesenchymal-stem-cells-on-polyaniline-composited-by-polyethersulfone-nanofibers
#14
Faeze Pournaqi, Armaghan Ghiaee, Saeid Vakilian, Abdolreza Ardeshirylajimi
Tissue engineering is a promising emerged method trying to reconstruct lost tissues that using synthetic and biomaterials and their combination with cells. The purpose of this study is increase osteoinductivity of polyethersulfone (PES) by using polyaniline (PANi). In this study, after fabrication of PES and composited PES-PANi scaffolds by electrospinning, scaffolds were characterized morphologically and mechanically. Then osteoinductivity of scaffolds was investigated by osteogenic differentiation of human mesenchymal stem cells (MSCs) cultured on the PES and PES-PANI in comparison to the tissue culture polystyrene as a control...
January 2017: Biologicals: Journal of the International Association of Biological Standardization
https://www.readbyqxmd.com/read/27741301/advanced-synthesis-of-conductive-polyaniline-using-laccase-as-biocatalyst
#15
Felipe de Salas, Isabel Pardo, Horacio J Salavagione, Pablo Aza, Eleni Amougi, Jesper Vind, Angel T Martínez, Susana Camarero
Polyaniline is a conductive polymer with distinctive optical and electrical properties. Its enzymatic synthesis is an environmentally friendly alternative to the use of harsh oxidants and extremely acidic conditions. 7D5L, a high-redox potential laccase developed in our lab, is the biocatalyst of choice for the synthesis of green polyaniline (emeraldine salt) due to its superior ability to oxidize aniline and kinetic stability at the required polymerization conditions (pH 3 and presence of anionic surfactants) as compared with other fungal laccases...
2016: PloS One
https://www.readbyqxmd.com/read/27714161/inflammation-sensitive-in-situ-smart-scaffolding-for-regenerative-medicine
#16
Hirak K Patra, Yashpal Sharma, Mohammad Mirazul Islam, Mohammad Javad Jafari, N Arul Murugan, Hisatoshi Kobayashi, Anthony P F Turner, Ashutosh Tiwari
To cope with the rapid evolution of the tissue engineering field, it is now essential to incorporate the use of on-site responsive scaffolds. Therefore, it is of utmost importance to find new 'Intelligent' biomaterials that can respond to the physicochemical changes in the microenvironment. In this present report, we have developed biocompatible stimuli responsive polyaniline-multiwalled carbon nanotube/poly(N-isopropylacrylamide), (PANI-MWCNT/PNIPAm) composite nanofiber networks and demonstrated the physiological temperature coordinated cell grafting phenomenon on its surface...
October 6, 2016: Nanoscale
https://www.readbyqxmd.com/read/27633753/amino-fe3o4-microspheres-directed-synthesis-of-a-series-of-polyaniline-hierarchical-nanostructures-with-different-wettability
#17
Yong Ma, Yanhui Chen, Chunping Hou, Hao Zhang, Mingtao Qiao, Hepeng Zhang, Qiuyu Zhang
We demonstrated polyaniline (PANI) dimensional transformation by adding trace amino-Fe3O4 microspheres to aniline polymerization. Different PANI nanostructures (i.e., flowers, tentacles, and nanofibers) could be produced by controlling the nucleation position and number on the surface of Fe3O4 microspheres, where hydrogen bonding were spontaneously formed between amino groups of Fe3O4 microspheres and aniline molecules. By additionally introducing an external magnetic field, PANI towers were obtained. These PANI nanostructures displayed distinctly different surface wettability in the range from hydrophobicity to hydrophilicity, which was ascribed to the synergistic effect of their dimension, hierarchy, and size...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27555438/flower-like-zno-decorated-polyaniline-reduced-graphene-oxide-nanocomposites-for-simultaneous-determination-of-dopamine-and-uric-acid
#18
Kh Ghanbari, M Moloudi
A novel sensor was fabricated by electrochemical deposition of ZnO flower-like/polyaniline nanofiber/reduced graphene oxide nanocomposite (ZnO/PANI/RGO) on glassy carbon electrode (GCE) for direct detection of dopamine (DA) and uric acid (UA) in the presence of fixed concentration of ascorbic acid (AA). Surface morphology and characterization of the modified electrodes were confirmed by field emission scanning microscopy (FE-SEM), X-ray diffraction (XRD), Raman and FT-IR spectroscopies. For individual detection, the linear responses were in the two concentration ranges of 0...
November 1, 2016: Analytical Biochemistry
https://www.readbyqxmd.com/read/27544447/strongly-coupled-polyaniline-graphene-hybrids-with-much-enhanced-capacitance-performance
#19
Xin Xi, Ruili Liu, Tao Huang, Yi Xu, Dongqing Wu
To enforce the interactions between polyaniline (PANI) and graphene, a facile strategy is developed in this work to fabricate the strongly coupled hybrids of PANI nanofibers and graphene (named as PAGs) by introducing different diamines to functionalize graphene oxide. As the electrode material in a two-electrode supercapacitor (SC), the ethylenediamine-functionalized hybrid (PAG-EDA) deliveries an excellent volumetric specific capacitance of 810Fcm(-3) at 5mVs(-1). The SC also manifests high cycling stability by maintaining 84...
December 1, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27467445/supercapacitor-electrodes-based-on-high-purity-electrospun-polyaniline-and-polyaniline-carbon-nanotube-nanofibers
#20
Silas K Simotwo, Christopher DelRe, Vibha Kalra
Freestanding, binder-free supercapacitor electrodes based on high-purity polyaniline (PANI) nanofibers were fabricated via a single step electrospinning process. The successful electrospinning of nanofibers with an unprecedentedly high composition of PANI (93 wt %) was made possible due to blending ultrahigh molecular weight poly(ethylene oxide) (PEO) with PANI in solution to impart adequate chain entanglements, a critical requirement for electrospinning. To further enhance the conductivity and stability of the electrodes, a small concentration of carbon nanotubes (CNTs) was added to the PANI/PEO solution prior to electrospinning to generate PANI/CNT/PEO nanofibers (12 wt % CNTs)...
August 24, 2016: ACS Applied Materials & Interfaces
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