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Melda Sezen-Edmonds, Petr P Khlyabich, Yueh-Lin Loo
We demonstrate the tunability of both the polarity and the magnitude of the piezoresistive response of polyaniline that is template-synthesized on poly(2-acrylamido-2-methyl-1-propanesulfonic acid), PANI-PAAMPSA, by altering the template molecular weight. Piezoresistivity is quantified by gauge factor, a unitless parameter that relates changes in electrical resistance to applied strain. The gauge factor of PANI-PAAMPSA decreases linearly and becomes negative with decreasing PAAMPSA molecular weight. The polarity of PANI-PAAMPSA's gauge factor is determined by macroscopic connectivity across thin films...
March 20, 2017: ACS Applied Materials & Interfaces
Sudakar Padmanaban, Minog Kim, Sungho Yoon
Silver nanobelts (AgNBs) have attracted a great interest due to their excellent electrical conductivity and mechanical strength, leading a facile synthesis of these AgNBs in great demand. In here, we are reporting a simple, aqueous phase, size tunable synthesis of smooth surfaced 1D-silver nanobelts using a Polyaniline (PANi) derived polymer at room temperature. The specifically designed PANi polymer, comprising a pendant carboxyl group in the chain, acted as both a reducing agent and template. The resulting Ag nanobelts have more than 10 μm of length, mean width values ranging from 41...
March 20, 2017: Scientific Reports
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
Weizhe Zhang, Beizhen Xie, Lige Yang, Dawei Liang, Ying Zhu, Hong Liu
Carbon cloth with brush-like polyaniline (BL-PANI) nanowire arrays generated on the surface was utilized as anode material in this study to improve the power output of MFCs. A novel pulsed voltage method was applied to fabricate BL-PANI with PANI nanowires of ∼230nm of length. By using BL-PANI modified carbon cloth as anode, the power output was improved by 58.1% and 36.1% compared to that of plain carbon cloth and PANI modified carbon cloth with ordinary structure, respectively. Electrochemical tests revealed that both electron transfer resistance and charge transfer resistance were decreased owing to high specific area for microbes' growth and diffusion of charged species...
February 28, 2017: Bioresource Technology
José Manoel Wanderley Duarte Neto, Jackeline da Costa Maciel, Júlia Furtado Campos, Luiz Bezerra de Carvalho Junior, Daniela Araújo Viana Marques, Carolina de Albuquerque Lima, Ana Lúcia Figueiredo Porto
This work reports an optimization of protease from Penicillium aurantiogriseum immobilization on polyaniline coated magnetic nanoparticles for antioxidant peptides obtainment derived from bovine casein. Immobilization process was optimized using a full two-level factorial design (2(4)) followed by a response surface methodology (RSM). Using the derivative, casein was hydrolyzed uncovering its peptides that were sequenced and had antioxidant properties tested via ABTS radical scavenging and Hydrogen peroxide scavenging assays...
February 10, 2017: Preparative Biochemistry & Biotechnology
Dai Hata, Toshiyuki Moriuchi, Toshikazu Hirao, Toru Amaya
A catalytic amount of a reduced form of polyaniline, redox-active p-conjugated polymer, induced C-H direct arylation of (hetero)arenes with arenediazonium salts prepared from anilines with methanesulfonic acid (MeSO3H) and tert-butyl nitrite (t-BuONO). The difficult point is the coexistence of an oxidant and a reductant in this sequential diazotization and arylation system; the diazotization reagents such as alkyl nitrites are weak oxidants and the arylation is induced by a reductant. It was achieved by the careful control of the amount of t-BuONO (1...
March 9, 2017: Chemistry: a European Journal
Guan Wu, Pengfeng Tan, Dongxing Wang, Zhe Li, Lu Peng, Ying Hu, Caifeng Wang, Wei Zhu, Su Chen, Wei Chen
Supercapacitors, which store electrical energy through reversible ion on the surface of conductive electrodes have gained enormous attention for variously portable energy storage devices. Since the capacitive performance is mainly determined by the structural and electrochemical properties of electrodes, the electrodes become more crucial to higher performance. However, due to the disordered microstructure and low electrochemical activity of electrode for ion tortuous migration and accumulation, the supercapacitors present relatively low capacitance and energy density...
March 8, 2017: Scientific Reports
Ashwak Jasim, Muhammad Wajid Ullah, Zhijun Shi, Xiao Lin, Guang Yang
Electrically conductive polymeric membranes of BC with polyaniline (PAni) were fabricated through ex situ oxidative polymerization. PAni was densely arrayed along BC fibers and SWCNTs were uniformly distributed in the composites as confirmed by field emission scanning electron microscopy (FE-SEM). Fourier transform-infrared (FT-IR) spectra of the composite membranes exhibited characteristic peaks for specific functional groups of PAni and SWCNTs besides BC. X-ray diffraction (XRD) analysis indicated the presence of specific peaks for BC, PAni, and SWCNTs in the composites...
May 1, 2017: Carbohydrate Polymers
Haihua Wang, Huan Wen, Bin Hu, Guiqiang Fei, Yiding Shen, Liyu Sun, Dong Yang
Waterborne polyaniline (PANI) dispersion has got extensive attention due to its environmental friendliness and good processability, whereas the storage stability and mechanical property have been the challenge for the waterborne PANI composites. Here we prepare for waterborne PANI dispersion through the chemical graft polymerisation of PANI into epichlorohydrin modified poly (vinyl alcohol) (EPVA). In comparison with waterborne PANI dispersion prepared through physical blend and in situ polymerisation, the storage stability of PANI-g-EPVA dispersion is greatly improved and the dispersion keeps stable for one year...
March 6, 2017: Scientific Reports
Solmaz Banihashemi, Habib Bagheri
We synthesized a titanium dioxide-polyaniline core-shell nanocomposite and implemented it as an efficient sorbent for the needle-trap extraction of some volatile organic compounds from urine samples. Polyaniline was synthesized, in the form of the emeraldine base, dissolved in dimethyl acetamide followed by diluting with water at pH 2.8, using the interfacial polymerization method. The TiO2 nanoparticles were encapsulated inside the conducting polymer shell, by adapting the in situ dispersing approach. The surface characteristics of the nanocomposite were investigated by Fourier transform infrared spectrometry, scanning electron microscopy and transmission electron microscopy...
March 6, 2017: Journal of Separation Science
Chaoqun You, Hongshuai Wu, Mingxin Wang, Senlin Wang, Tianyi Shi, Yanghui Luo, Baiwang Sun, Xiangyang Zhang, Jin Zhu
Near infrared mediated novel strategy to control the drug release from nanocarriers has developed rapidly in the past decades. Polyaniline as a non-cytotoxic and electroactive material for studying cellular proliferation has caused great attention in recent years. At present work, polyaniline mediated polymeric nanoparticles were developed to target delivery of cisplatin and release in a controllable way. The prepared polyaniline nanoparticles (PANPs) show a size of 90±1.0 nm, a favourable morphology in water and can be targeted delivery to tumors through the highly affinity between Trastuzumab and the overexpressed Her2 in tumor cells...
March 3, 2017: Nanotechnology
Chih-Wei Hu, Yasusei Yamada, Kazuki Yoshimura
We report the first observation of gasochromism for a material based on a thin film of polyaniline:polystyrene sulfonate/platinum nanoparticles (PANI:PSS/PtNPs). This novel material displayed a significant colour change, from green to pale yellow, when exposed to hydrogen. Our results show that the PtNPs trigger a reductive reaction on the polymer surface. This new mechanism dramatically expands the selection of available gasochromic materials.
March 18, 2017: Chemical Communications: Chem Comm
Hiroyuki Itoi, Shinya Hayashi, Hidenori Matsufusa, Yoshimi Ohzawa
Polyaniline (PANI) was synthesized exclusively inside the micropores of activated carbon (AC). This nanosized PANI was smaller than 2 nm in diameter and allowed for fast redox reactions, exhibiting superior pseudocapacitance in terms of power and energy densities over the electric double layer capacitance generated inside the micropores.
March 14, 2017: Chemical Communications: Chem Comm
Jing Luo, Jing Huang, Yunan Wu, Jun Sun, Wei Wei, Xiaoya Liu
In this work, a novel kind of water-dispersible molecular imprinted conductive polyaniline particles was prepared through a facile and efficient macromolecular co-assembly of polyaniline with amphiphilic copolymer, and applied as the molecular recognition element to construct protein electrochemical sensor. In our strategy, an amphiphilic copolymer P(AMPS-co-St) was first synthesized using 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) and styrene (St) as monomer, which could co-assemble with PANI in aqueous solution to generate PANI particles driven by the electrostatic interaction...
February 24, 2017: Biosensors & Bioelectronics
Feng Zhang, Chengkai Yang, Xin Gao, Shuai Chen, Yiran Hu, Huanqin Guan, Yurong Ma, Jin Zhang, Henghui Zhou, Limin Qi
The rational design and controllable fabrication of electrode materials with tailored structures and superior performance is highly desirable for the next-generation lithium ion batteries (LIBs). In this work, a novel three-dimensional (3D) graphite foam (GF)@SnO2 nanorod arrays (NRAs)@polyaniline (PANI) hybrid architecture was constructed via solvothermal growth followed by electrochemical deposition. Aligned SnO2 NRAs were uniformly grown on the surface of GF, and a PANI shell with a thickness of ∼40 nm was coated on individual SnO2 nanorods, forming a SnO2@PANI core-shell structure...
March 22, 2017: ACS Applied Materials & Interfaces
Mohammad Omaish Ansari, Rajeev Kumar, Sajid Ali Ansari, Shahid Pervez Ansari, M A Barakat, Ahmed Alshahrie, Moo Hwan Cho
Multiwalled carbon nanotube (CNT)-graphene oxide (GO) composite was combined with polyaniline (Pani) using an oxidative polymerisation technique. The resulting Pani@GO-CNT was later doped with para toluene sulphonic acid (pTSA) to generate additional functionality. The functional groups exposed on the GO, Pani and pTSA were expected to impart a high degree of functionality to the pTSA-Pani@GO-CNT composite system. The composite was characterised by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy...
February 20, 2017: Journal of Colloid and Interface Science
Darshan Gh, Dexu Kong, Julien Gautrot, Shyam Kumar Vootla
Conductive polymers are interesting materials for a number of biological and medical applications requiring electrical stimulation of cells or tissues. Highly conductive polymers (polypyrrole and polyaniline)/Antheraea mylitta silk fibroin coated fibers are fabricated successfully by in situ polymerization without any modification of the native silk fibroin. Coated fibers characterized by scanning electron microscopy confirm the silk fiber surface is covered by conductive polymers. Thermogravimetric analysis reveals preserved thermal stability of silk fiber after coating process...
February 27, 2017: Macromolecular Bioscience
Mir Ghasem Hosseini, Elham Shahryari
Chitosan/Graphene Oxide-MWCNT/polyaniline (CS/GM/PANI) ternary nanocomposite has been synthesized via in situ polymerization of aniline in the presence of CS/GM. The Morphology of nanocomposites was studied by Field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FT-IR) spectroscopy, as well as X-ray photoelectron spectroscopy (XPS). Futthermore, the supercapacitive behavior of the CS-based samples was investigated using cyclic voltammetry (CV), galvanostatic charge-discharge (CD) and electrochemical impedance spectroscopy (EIS) techniques in 0...
February 14, 2017: Journal of Colloid and Interface Science
Chaozhong Guo, Youcheng Wu, Zhongbin Li, Wenli Liao, Lingtao Sun, Chao Wang, Bixia Wen, Yanrong Li, Changguo Chen
The design of noble-metal-free catalysts for oxygen reduction reaction (ORR) is very important to the commercialization of fuel cells. Here, we use a Co-modified montmorillonite (Co-MMT) as a flat template to prepare Co- and N-doped nanocarbon ORR catalysts derived from carbonization of polyaniline at controlled temperatures. The use of flat template can hinder the agglomeration of polyaniline during pyrolysis process and optimize the N-rich active site density on the surface. The addition of transition metal Co in the flat MMT template can largely promote the formation of Co-N sites in prepared catalyst, facilitating the effective improvement of catalytic activity towards the ORR with a direct four-electron transfer pathway...
December 2017: Nanoscale Research Letters
Panagiotis Dallas, Ilija Rašović, Tim Puchtler, Robert A Taylor, Kyriakos Porfyrakis
We report the effect of surfactant addition on the optical properties of perfluorinated polyanilines synthesized through liquid-liquid interfaces. We obtained very long Stokes shifts, 205 nm, for oligomers derived from a hydrofluoroether-water system in the presence of Triton X-100 as a surfactant, and vibronic fine features from a toluene-water system.
February 23, 2017: Chemical Communications: Chem Comm
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