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Polyaniline nanofibers

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https://www.readbyqxmd.com/read/28632137/electrospun-silk-polyaniline-conduits-for-functional-nerve-regeneration-in-rat-sciatic-nerve-injury-model
#1
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
https://www.readbyqxmd.com/read/28599179/a-needle-type-glucose-biosensor-based-on-pani-nanofibers-and-pu-e-pu-membrane-for-long-term-invasive-continuous-monitoring
#2
Lu Fang, Bo Liang, Guang Yang, Yichuan Hu, Qin Zhu, Xuesong Ye
A minimally invasive glucose biosensor capable of continuous monitoring of subcutaneous glucose has been developed in this study. This sensor was prepared using electropolymerized conductive polymer polyaniline (PANI) nanofibers as an enzyme immobilization material and polyurethane (PU)/epoxy-enhanced polyurethane (E-PU) bilayer coating as a protective membrane. The sensor showed almost the same sensitivity (63nA/mM) and linearity (0-20mM with the correlation coefficient r(2) of 0.9997) in both PBS and bovine serum tests...
April 28, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28540957/a-skin-integrated-transparent-and-stretchable-strain-sensor-with-interactive-color-changing-electrochromic-displays
#3
Heun Park, Dong Sik Kim, Soo Yeong Hong, Chulmin Kim, Jun Yeong Yun, Seung Yun Oh, Sang Woo Jin, Yu Ra Jeong, Gyu Tae Kim, Jeong Sook Ha
In this study, we report on the development of a stretchable, transparent, and skin-attachable strain sensor integrated with a flexible electrochromic device as a human skin-inspired interactive color-changing system. The strain sensor consists of a spin-coated conductive nanocomposite film of poly(vinyl alcohol)/multi-walled carbon nanotube/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) on a polydimethylsiloxane substrate. The sensor exhibits excellent performance of high sensitivity, high durability, fast response, and high transparency...
June 8, 2017: Nanoscale
https://www.readbyqxmd.com/read/28535471/graphene-oxide-supported-carbon-nanofiber-like-network-derived-from-polyaniline-a-novel-composite-for-enhanced-glucose-oxidase-bioelectrode-performance
#4
Zepeng Kang, Kailong Jiao, Xinping Xu, Ruiyun Peng, Shuqiang Jiao, Zongqian Hu
A three-dimensional architecture of PANI@GO hybrid was synthesized via in-situ polymerization of aniline monomers on the surface of graphene oxide (GO) and carbonized at 1600°C. The SEM images showed that surfaces of planar GO were covered by a compact nanofiber-like polyaniline (PANI) layer which presented an interconnected network. Nanofiber-like PANI on the GO surface was mostly preserved and became the carbon nanofibers (CNFs) after carbonization. The TEM images showed that the carbonized PANI grew seamlessly on the GO surface and served as conductive "network" between interlayers of GO...
May 12, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28526848/room-temperature-magnetism-in-carbon-dots-and-enhanced-ferromagnetism-in-carbon-dots-polyaniline-nanocomposite
#5
Jian Liu, Hong Bi, Paulo Cesar Morais, Xiang Zhang, Fapei Zhang, Lin Hu
Room temperature magnetic ordering is reported for very small carbon dots (CDs), mat-like polyaniline nanofibers (Mat-PANI) and a composite of CDs@Mat-PANI containing 0.315 wt% CDs. We have found saturation magnetization (M S ) of CDs, Mat-PANI and CDs@Mat-PANI at 5 (20/300) K equals to 0.0079 (0.0048/0.0019), 0.0116 (0.0065/0.0055) and 0.0349 (0.0085/0.0077) emu/g, respectively. The M S enhancement in CDs@Mat-PANI (200% and 40% at 5 K and 300 K, respectively) is attributed to electron transfer from Mat-PANI imine N-atoms to the encapsulated CDs...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28494717/gelatin-as-biomaterial-for-tissue-engineering
#6
Mari Carmen Echave, Laura Saenz Del Burgo, Jose Luis Pedraz, Gorka Orive
Tissue engineering is considered one of the most important therapeutic strategies of regenerative medicine. The main objective of these new technologies is the development of substitutes made with biomaterials that are able to heal, repair or regenerate injured or diseased tissues and organs. These constructs seek to unlock the limited ability of human tissues and organs to regenerate. In this review, we highlight the convenient intrinsic properties of gelatin for the design and development of advanced systems for tissue engineering...
May 11, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28488855/filtration-and-electrochemical-disinfection-performance-of-pan-pani-agnws-cc-composite-nanofiber-membrane
#7
Junjie Wen, Xiaojun Tan, Yongyou Hu, Qian Guo, Xuesen Hong
The removal and inactivation of waterborne pathogens from drinking water are important for human health. Here, a polyacrylonitrile/polyaniline/silver nanowires-carbon fiber cloth (PAN/PANI/AgNWs-CC) composite nanofiber membrane was fabricated using a simple and rapid coelectrospinning process, and an electrical device was applied with the PAN/PANI/AgNWs-CC filter for water electrochemical disinfection. The effects of voltage, flow rate, and microbial concentration on the filtration and electrochemical disinfection performance of the nanocomposite membrane were investigated...
June 6, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28471169/simple-and-mediator-free-urea-sensing-based-on-engineered-nanodiamonds-with-polyaniline-nanofibers-synthesized-in-situ
#8
Vanish Kumar, Rashmi Mahajan, Inderpreet Kaur, Ki-Hyun Kim
In an effort to develop a simple and mediator-free sensing media for urea, a polyaniline (PANI) and graphitized nanodiamond (GND) nanocomposite was prepared at room temperature via an in situ interfacial polymerization approach. The interaction of ions produced during the hydrolysis of urea with nanomaterial was utilized for the amperometric sensing of urea. The performance of this composite (GND/PANI) was evaluated for the detection of urea referenced to PANI. Accordingly, both platforms exhibited good linearity across a varying concentration of 0...
May 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28427673/sonocatalytic-rapid-degradation-of-congo-red-dye-from-aqueous-solution-using-magnetic-fe-0-polyaniline-nanofibers
#9
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
#10
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 carried out 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
#11
Jeongjoon Lee, Inseon Lee, Jahyun Nam, Dong Soo Hwang, Kyung-Min Yeon, Jungbae Kim
Acylase (AC) was immobilized and stabilized on carboxylated polyaniline nanofibers (cPANFs) for the development of antifouling nanobiocatalysts with high enzyme loading and stability. AC 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 with Mag-EPC was 75 and 300 times higher than that of those with CA and EC, respectively, representing improved enzyme loading in the form of Mag-EPC...
April 26, 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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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