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Polyaniline nanofibers

Kun Zhou, Yuan He, Qingchi Xu, Qin'e Zhang, An'an Zhou, Zihao Lu, Li-Kun Yang, Yuan Jiang, Dongtao Ge, Xiang Yang Liu, Hua Bai
Although challenging, fabrication of porous conducting polymeric materials with excellent electronic properties is crucial for many applications. We developed a fast in-situ polymerization approach to pure polyaniline (PANI) hydrogels, with vanadium pentoxide hydrate nanowires as both the oxidant and sacrifice template. A network comprised of ultrathin PANI nanofibers was generated during the in-situ polymerization, and the large aspect ratio of these PANI nanofibers allowed the formation of hydrogels at a low solid content of 1...
May 11, 2018: ACS Nano
HaoTian Harvey Shi, Nazanin Khalili, Taylor Morrison, Hani Naguib
A novel polyaniline nanorod (PAniNR) three-dimensional structure was successfully grown on flexible polyacrylonitrile (PAN) nanofiber substrate as the electrode material for electrochemical capacitors, constructed via self-stabilized dispersion polymerization process. The electrode offered desired mechanical properties such as flexibility and bendability, while it maintained optimal electrochemical characteristics. The electrode and the assembled electrochemical capacitor cell also achieved intrinsic piezoresistive sensing properties, leading to the real-time monitoring of excess mechanical pressure and bending during cell operations...
May 9, 2018: ACS Applied Materials & Interfaces
Ajay Kumar Yagati, Sachin Ganpat Chavan, Changyoon Baek, Min-Ho Lee, Junhong Min
Aflatoxin B1 (AFB₁) is produced by the Aspergillus flavus and Aspergillus parasiticus group of fungi which is most hepatotoxic and hepatocarcinogenic and occurs as a contaminant in a variety of foods. AFB₁ is mutagenic, teratogenic, and causes immunosuppression in animals and is mostly found in peanuts, corn, and food grains. Therefore, novel methodologies of sensitive and expedient strategy are often required to detect mycotoxins at the lowest level. Herein, we report an electrochemical impedance sensor that selectively detects AFB₁ at the lowest level by utilizing polyaniline nanofibers (PANI) coated with gold (Au) nanoparticles composite based indium tin oxide (ITO) disk electrodes...
April 24, 2018: Sensors
Baolin Guo, Peter X Ma
Electrically conducting polymers such as polyaniline, polypyrrole, polythiophene and their derivatives (mainly aniline oligomer and poly(3,4-ethylenedioxythiophene)) with good biocompatibility find wide applications in biomedical fields including bioactuators, biosensors, neural implants, drug delivery systems and tissue engineering scaffolds. This review focuses on these conductive polymers for tissue engineering application. Conductive polymers exhibited promising conductivity as bioactive scaffolds for tissue regeneration and their conductive nature allows cells or tissue cultured on them to be stimulated by electrical signals...
April 23, 2018: Biomacromolecules
Kyung Ho Kim, Samuel Lara-Avila, Hans He, Hojin Kang, Sung Ju Hong, Min Park, Johnas Eklöf, Kasper Moth-Poulsen, Satoshi Matsushita, Kazuo Akagi, Sergey Kubatkin, Yung Woo Park
Using magneto transport, we probe hopping length scales in the variable range hopping conduction of carbonized polyacetylene and polyaniline nanofibers. In contrast to pristine polyacetylene nanofibers that show vanishing magneto conductance at large electric fields, carbonized polymer nanofibers display a negative magneto conductance that decreases in magnitude but remains finite with respect to the electric field. We show that this behavior of magneto conductance is an indicator of the electric field and temperature dependence of hopping length in the gradual transition from the thermally activated to the activation-less electric field driven variable range hopping transport...
March 21, 2018: Scientific Reports
Sathish Kumar Ponnaiah, Prakash Periakaruppan, Balakumar Vellaichamy
A simple and very sensitive electrochemical sensor for the detection of uric acid (UA) has been developed based on polyaniline (PANI) merged into a silver-doped iron oxide (Ag-Fe2 O3 ) nanocomposite-modified glassy carbon electrode. The synthesized ternary composite material (Ag-Fe2 O3 @PANI) was characterized by UV-visible spectroscopy, Fourier transform infrared spectroscopy, energy-dispersive X-ray, High-resolution transmission electron microscopy, X-ray diffraction, and thermo gravimetric analysis analyses...
March 29, 2018: Journal of Physical Chemistry. B
Nadeeka D Tissera, Ruchira N Wijesena, Samantha Rathnayake, Rohini M de Silva, K M Nalin de Silva
Electrically conductive cotton fabric was fabricated by in situ one pot oxidative polymerization of aniline. Using a simple heterogeneous polymerization method, polyaniline (PANI) nano fibers with an average fiber diameter of 40-75 nm were grafted in situ onto cotton fabric. The electrical conductivity of the PANI nanofiber grafted fabric was improved 10 fold compared to fabric grafted with PANI nanoclusters having an average cluster size of 145-315 nm. The surface morphology of the cotton fibers was characterized using SEM and AFM...
April 15, 2018: Carbohydrate Polymers
Ping Zhou, Jing Li, Wenwen Yang, Lihua Zhu, Heqing Tang
The wetting property of nanomaterials is of great importance to both fundamental understanding and potential applications. However, the study on the intrinsic wetting property of nanomaterials is interfered by organic capping agents, which are often used to lower the surface energy of nanomaterials and avoid their irreversible agglomeration. In this work, the wetting property of the nanostructured polyaniline that requires no organic capping agents is investigated. Compared to hydrophilic granular particulates, polyaniline nanofibers are amphiphilic and have an excellent capability of creating Pickering emulsions at a wide range of pH...
February 27, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Ruibo Zhong, Qian Tang, Shaopeng Wang, Hongbo Zhang, Feng Zhang, Mingshu Xiao, Tiantian Man, Xiangmeng Qu, Li Li, Weijia Zhang, Hao Pei
Conducting hydrogels provide great potential for creating designer shape-morphing architectures for biomedical applications owing to their unique solid-liquid interface and ease of processability. Here, a novel nanofibrous hydrogel with significant enzyme-like activity that can be used as "ink" to print flexible electrochemical devices is developed. The nanofibrous hydrogel is self-assembled from guanosine (G) and KB(OH)4 with simultaneous incorporation of hemin into the G-quartet scaffold, giving rise to significant enzyme-like activity...
March 2018: Advanced Materials
Yilin Jiang, Zhifeng Liu, Guangming Zeng, Yujie Liu, Binbin Shao, Zhigang Li, Yang Liu, Wei Zhang, Qingyun He
Hexavalent chromium (Cr(VI)) is a common hazardous contaminant in the environment and carcinogenic or mutagenic to aquatic animals and human beings. Therefore, the removal and detoxification of Cr(VI) have been attracting increasing attention of researchers. Among various conducting polymers, polyaniline (PANI)-based adsorbents have shown an excellent performance on the removal of Cr(VI) because of their redox properties, eased synthesis, and favorable biocompatibility. In this review, the characteristics of various PANI-based adsorbents were described, including PANI-modified nanofiber mats and membranes, PANI/bio-adsorbents, PANI/magnetic adsorbents, PANI/carbon adsorbents, PANI-modified clay composites, and PANI-inorganic hybrid composites...
March 2018: Environmental Science and Pollution Research International
M U Anu Prathap, Carlos Iván Rodríguez, Omer Sadak, Jiehao Guan, Vijayasaradhi Setaluri, Sundaram Gunasekaran
We report the development of an antibody (anti-MC1R antibody)-functionalized polyaniline nanofibers modified screen-printed electrode capable of efficient electrochemical detection of melanoma cells at levels (1 cell per mL) not readily achieved by other methods. This immunosensor is highly selective in its detection of melanoma cells over normal human cells.
January 18, 2018: Chemical Communications: Chem Comm
John R Aggas, William Harrell, Jodie Lutkenhaus, Anthony Guiseppi-Elie
The interface between the conductive polymer, polyaniline (PAn-Cl), and gold, platinum, or an interceding layer of electrodeposited platinum on gold or platinum, markedly influences the apparent electrical properties and the electronic to ionic transition in physiological buffers. Polyester-supported, sputter-deposited gold and platinum thin films were laser patterned to yield co-planar Thin Film Electrodes (TFEs) suitable for platinization and deposition of PAn-Cl nanofibers. Electrodeposition of platinum from chloroplatinic acid (50 mC cm-2 ) onto gold produced larger feature sizes and larger surface roughness (23...
January 3, 2018: Nanoscale
Fatimah Syahidah Mohamad, Mohd Hazani Mat Zaid, Jaafar Abdullah, Ruzniza Mohd Zawawi, Hong Ngee Lim, Yusran Sulaiman, Norizah Abdul Rahman
This article describes chemically modified polyaniline and graphene (PANI/GP) composite nanofibers prepared by self-assembly process using oxidative polymerization of aniline monomer and graphene in the presence of a solution containing poly(methyl vinyl ether- alt -maleic acid) (PMVEA). Characterization of the composite nanofibers was carried out by Fourier transform infrared (FTIR) and Raman spectroscopy, transmission electron microscopy (TEM) and scanning electron microscopy (SEM). SEM images revealed the size of the PANI nanofibers ranged from 90 to 360 nm in diameter and was greatly influenced by the proportion of PMVEA and graphene...
December 2, 2017: Sensors
Sanjit Kumar Mahato, Madhumita Bhaumik, Arun Maji, Abhijit Dutta, Debabrata Maiti, Arjun Maity
A facile chemoselective one-pot strategy for the deprotection of oxime has been developed using Fe0 -polyaniline composite nanofiber (Fe0 -PANI), as a catalyst. Nano material based Fe0 -PANI catalyst has been synthesized via in-situ polymerization of ANI monomer and followed by reductive deposition of Fe0 onto PANI matrix. The catalyst was characterized by FE-SEM, HR-TEM, BET, XRD, ATR-FTIR, XPS and VSM techniques. The scope of the transformation was studied for aryl, alkyl and heteroarylketoxime with excellent chemoselectivity (>99%)...
March 1, 2018: Journal of Colloid and Interface Science
Choon-Sang Park, Eun Young Jung, Dong Ha Kim, Do Yeob Kim, Hyung-Kun Lee, Bhum Jae Shin, Dong Ho Lee, Heung-Sik Tae
Although polymerized aniline (polyaniline, PANI) with and without iodine (I₂) doping has already been extensively studied, little work has been done on the synthesis of PANI films using atmospheric pressure plasma (APP) deposition. Therefore, this study characterized pure and I₂-doped PANI films synthesized using an advanced APP polymerization system. The I₂ doping was conducted ex-situ and using an I₂ chamber method following the APP deposition. The pure and I₂-doped PANI films were structurally analyzed using field emission scanning electron microscope (FE-SEM), atomic force microscope (AFM), X-ray Diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and time of flight secondary ion mass spectrometry (ToF-SIMS) studies...
November 6, 2017: Materials
S Muralikrishna, D H Nagaraju, R Geetha Balakrishna, Werasak Surareungchai, T Ramakrishnappa, Avinash B Shivanandareddy
Conducting polymers with graphene/graphene oxide hydrogels represent a unique class of electrode materials for sensors and energy storage applications. In this article, we report a facile in situ method for the polymerisation of aniline resulting in the decoration of 1D conducting polyaniline (PANI) nanofibers onto the surface of 2D graphene oxide (GO) nanosheets followed by hydrogel formation at elevated temperature. The synthesized nanomaterial exhibits significant properties for the highly sensitive electrochemical determination as well as removal of environmentally harmful lead (Pb2+ ) ions...
October 16, 2017: Analytica Chimica Acta
Serge Ostrovidov, Majid Ebrahimi, Hojae Bae, Hung Kim Nguyen, Sahar Salehi, Sang Bok Kim, Akichika Kumatani, Tomokazu Matsue, Xuetao Shi, Ken Nakajima, Shizu Hidema, Makoto Osanai, Ali Khademhosseini
In this study, composite gelatin-polyaniline (PANI) nanofibers doped with camphorsulfonic acid (CSA) were fabricated by electrospinning and used as substrates to culture C2C12 myoblast cells. We observed enhanced myotube formation on composite gelatin-PANI nanofibers compared to gelatin nanofibers, concomitantly with enhanced myotube maturation. Thus, in myotubes, intracellular organization, colocalization of the dihydropyridine receptor (DHPR) and ryanodine receptor (RyR), expression of genes correlated to the excitation-contraction (E-C) coupling apparatus, calcium transients, and myotube contractibility were increased...
December 13, 2017: ACS Applied Materials & Interfaces
Rajeev Kumar, M A Barakat, F A Alseroury
Nanomaterials with selective adsorption properties are in demand for environmental applications. Herein, acid etching and oxidative decomposition of melon units of graphitic carbon nitride (g-C3N4) was performed to obtain the oxidized graphitic carbon nitride (Ox-g-C3N4) nanosheets. Ox- g-C3N4 nanosheets were further decorated on the polyaniline nanofiber (Ox-g-C3N4/Pani-NF). Ox-g-C3N4/Pani-NF was well characterized and further applied for a selective removal of hexavalent chromium (Cr(VI)) form aqueous solution...
October 9, 2017: Scientific Reports
Bon Kang Gu, Sang Jun Park, Chun-Ho Kim
Conducting polymer-based scaffolds receive biological and electrical signals from the extracellular matrix (ECM) or peripheral cells, thereby promoting cell growth and differentiation. Chitin, a natural polymer, is widely used as a scaffold because it is biocompatible, biodegradable, and nontoxic. In this study, we used an electrospinning technique to fabricate conductive scaffolds from aligned chitin/polyaniline (Chi/PANi) nanofibers for the directional guidance of cells. Pure chitin and random and aligned Chi/PANi nanofiber scaffolds were characterized using field emission scanning electron microscope (FE-SEM) and by assessing wettability, mechanical properties, and electrical conductivity...
August 3, 2017: Journal of Biomaterials Science. Polymer Edition
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
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