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Ehsan Nazarzadeh Zare, Ahmad Motahari, Mika Sillanpää
Water contamination by toxic heavy metal ions and dyes remains a serious public health problem for humans, so attention on specific methods and technologies to remove heavy metal ions and dyes from wastewaters/aqueous solutions are desired. Numerous adsorbents have been reported for the removal of heavy metal ions/dyes from wastewaters/aqueous solutions. Polyaniline (PANI) and its derivatives, as conducting polymers, are good adsorbents to remove various kinds of heavy metal ions and dyes from wastewaters/aqueous solutions...
January 9, 2018: Environmental Research
Yen-Hao Lin, Tsung-Chi Lee, Yu-Sheng Hsiao, Wei-Keng Lin, Wha-Tzong Whang, Chun-Hua Chen
P-phenediamino-modified graphene (PDG) has been newly synthesized via a facile green one-step chemical route as a functionalized graphene-based additive to copolymerize with aniline for fabricating innovative PDG/polyaniline conducting polymer composites (PDG/PANI) containing very special semi-interpenetrating networks (S-IPNs). The S-IPNs which not only provide additional pathways by creating chemically-bonded PDG and PANI for smoothly transporting carriers, but greatly reduce the amount of graphene required to less than a few percent could effectively improve the overall electric conductivity and thus the thermoelectric performance...
January 10, 2018: ACS Applied Materials & Interfaces
Petr Humpolíček, Katarzyna Anna Radaszkiewicz, Zdenka Capáková, Jiří Pacherník, Patrycja Bober, Věra Kašpárková, Petra Rejmontová, Marián Lehocký, Petr Ponížil, Jaroslav Stejskal
Polyaniline cryogel is a new unique form of polyaniline combining intrinsic electrical conductivity and the material properties of hydrogels. It is prepared by the polymerization of aniline in frozen poly(vinyl alcohol) solutions. The biocompatibility of macroporous polyaniline cryogel was demonstrated by testing its cytotoxicity on mouse embryonic fibroblasts and via the test of embryotoxicity based on the formation of beating foci within spontaneous differentiating embryonic stem cells. Good biocompatibility was related to low contents of low-molecular-weight impurities in polyaniline cryogel, which was confirmed by liquid chromatography...
January 9, 2018: Scientific Reports
Aifeng Liu, Jing Liang, Rongguang Shi, Zongshan Zhao, Yong Tian
A sensitive, rapid and easy operated sensor for hydrogen peroxide (H2O2) determination in exhaled breath was developed in this study. The polyaniline (PANI) film and Cu nanoparticles were successively electrochemical deposited on the surface of the three-dimensional nickel foam, i.e., synthetized nano-Cu/polyaniline/nickel foam. The Ni foam facilitates the charge and mass transfer, and it also provides a large amount of anchoring sites for Cu nanoparticle deposition. The synergistic electro-catalytic actions between Cu nanoparticles and PANI highly enhanced the reduction current of H2O2...
January 10, 2018: Journal of Breath Research
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...
January 6, 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 4, 2018: Chemical Communications: Chem Comm
Jing Chen, Meng Yu, Baolin Guo, Peter X Ma, Zhanhai Yin
Conducting polymers and biodegradable polylactide (PLA) scaffolds are both promising biomaterials applied in bone tissue engineering. It is necessary to develop a composite scaffold combining their properties of osteogenic differentiation promotion and three-dimension matrix. To conquer the problem of poor processability of conductive polymers, we use a novel in-situ polymerization/thermal induced phase separation (TIPS) method to fabricate conductive nanofibrous PLA scaffolds with well-distributed polyaniline (PANI) nano-structures...
December 24, 2017: Journal of Colloid and Interface Science
Elena Yagudaeva, Dmitry Zybin, Alexander Vikhrov, Anna Prostyakova, Anatoly Ischenko, Vitaly Zubov, Dmitry Kapustin
Polyaniline (PANI) and polyaramides deposited on the surfaces of glass slides and particulate silica were studied as adsorbents of nucleic acids and proteins by flow-through spectral correlation interferometry and solid-state extraction using spin-cartridges. Double stranded DNA from E. coli as well as pepsin, bovine serum albumin and lysozyme were the analytes studied in contact with the polymer nanolayers in phosphate buffer solution, pH 7.2. None of the coated glass slides could bind the DNA, which passed them practically without adsorption...
December 15, 2017: Colloids and Surfaces. B, Biointerfaces
Ali Reza Ghiasvand, Kolsoum Nouriasl, Fatemeh Yazdankhah
A low-cost, sensitive and reliable reduced-pressure headspace solid-phase microextraction (HS-SPME) setup was developed and evaluated for direct extraction of residual solvents in commercial antibiotics, followed by determination by gas chromatography with flame ionization detection (GC-FID). A stainless steel narrow wire was made porous and adhesive by platinization by a modified electrophoretic deposition method and coated with a polyaniline/multiwalled carbon nanotube nanocomposite. All experimental variables affecting the extraction efficiency were investigated for both atmospheric-pressure and reduced-pressure conditions...
December 22, 2017: Analytical and Bioanalytical Chemistry
Peng Lv, Xun Tang, Ruilin Zheng, Xiaobo Ma, Kehan Yu, Wei Wei
Superelastic graphene aerogel with ultra-high compressibility shows promising potential for compression-tolerant supercapacitor electrode. However, its specific capacitance is too low to meet the practical application. Herein, we deposited polyaniline (PANI) into the superelastic graphene aerogel to improve the capacitance while maintaining the superelasticity. Graphene/PANI aerogel with optimized PANI mass content of 63 wt% shows the improved specific capacitance of 713 F g-1 in the three-electrode system...
December 19, 2017: Nanoscale Research Letters
Roby Soni, Varchaswal Kashyap, Divya Nagaraju, Sreekumar Kurungot
Polyaniline (PANI) as a pseudocapacitive material has very high theoretical capacitance of 2000 F g-1. However, its practical capacitance has been limited by low electrochemical surface area and unfavorable wettability towards aqueous electrolytes. This work deals with a strategy wherein high electrochemical surface area of PANI has been achieved by the induction of superhydrophilicity together with the alignment of PANI exclusively on the surface of carbon fibers as a thin layer to form a hybrid assembly. Superhydrophilicity is induced by electrochemical functionalization of the Toray carbon paper, which further induces superhydrophilicity to the electrodeposited PANI layer on the paper and, thereby, ensuring high electrode-electrolyte interface...
December 15, 2017: ACS Applied Materials & Interfaces
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...
December 14, 2017: Nanoscale
Yuechao Yao, Shaozhong Zeng, Lin Huang, Hongliang Wu, Biaolin Peng, Qi Zhang, Xiaohua Li, Liang Yu, Shiyu Liu, Wenxuan Tu, Tongbin Lan, Xierong Zeng, Jizhao Zou
Hollow carbon nanospheres (HCNs) with specific surface areas up to 2949 m2 g-1 and pore volume up to 2.9 cm3 g-1 were successfully synthesized from polyaniline-co-polypyrrole hollow nanospheres by carbonization and CO2 activation. The cavity diameter and wall thickness of HCNs can be easily controlled by activation time. Owing to their large inner cavity and enclosed structure, HCNs are desirable carriers for encapsulating sulfur. To better understand the effects of pore characteristics and sulfur contents on the performances of lithium-sulfur batteries, three composites of HCNs and sulfur are prepared and studied in detail...
December 13, 2017: Chemistry: a European Journal
Zhiwei Tang, Jinglin Jiang, Shaohong Liu, Luyi Chen, Ruliang Liu, Bingna Zheng, Ruowen Fu, Dingcai Wu
An activated carbon aerogel (ACA-500) with high surface area (1765 m2 g-1), pore volume (2.04 cm3 g-1), and hierarchical porous nanonetwork structure is prepared through direct activation of organic aerogel (RC-500) with a low potassium hydroxide ratio (1:1). Based on this substrate, a polyaniline (PANi)-coated activated carbon aerogel/sulfur (ACA-500-S@PANi) composite is prepared via a simple two-step procedure, including melt-infiltration of sublimed sulfur into ACA-500, followed by an in situ polymerization of aniline on the surface of ACA-500-S composite...
December 12, 2017: Nanoscale Research Letters
Marc Riedel, Fred Lisdat
Inspired by natural photosynthesis, coupling of artificial light-sensitive entities with biocatalysts in a biohybrid format can result in advanced photobioelectronic systems. Herein, we report on the integration of sulfonated polyanilines (PMSA1) and PQQ glucose dehydrogenase (PQQ-GDH) into inverse opal TiO2 (IO-TiO2) electrodes. While PMSA1 introduces sensitivity for visible light into the biohybrid architecture and ensures the efficient wiring between the IO-TiO2 electrode and the biocatalytic entity, PQQ-GDH provides the catalytic activity for the glucose oxidation and therefore feeds the light-driven reaction with electrons for an enhanced light-to-current conversion...
December 8, 2017: ACS Applied Materials & Interfaces
Yangxi Luo, Qin'e Zhang, Wenjing Hong, Zongyuan Xiao, Hua Bai
Active electrolyte enhanced supercapacitors (AEESCs) have received increasing attention because of their large specific capacitance and easy fabrication process. The better matching between the active electrolyte and the counter electrode and the slow self-discharge rate are the challenges of this type of supercapacitor. In this paper, a novel AEESC with polyaniline/reduced graphene oxide hydrogel (PANI/RGOHG) as the anode and Cu(ii) ions as the cathodic active electrolyte is constructed. Experimental results demonstrate that the electrode potentials of PANI and Cu(ii) can match perfectly, thus the device has a wide working voltage range...
December 6, 2017: Physical Chemistry Chemical Physics: PCCP
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
Asghar Dolatkhah, Lee D Wilson
The ability to achieve exquisite control over polymer building blocks within multi-compartment magnetite nanocomposites (NCs) to afford predictable and ordered packing hierarchical structures remains a significant challenge for the design of NCs. Thus, there is an urgent need to develop new types of nano dimensional assemblies that undergo responsive shape-shift, size-, phase- and morphological transitions, especially for processes that are triggered by biologically relevant stimuli such as ionic gradients to meet the demand for diverse applications...
December 4, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Lei Chen, Yanming Zhao, Shenghong Liu, Long Zhao
Although the NASICON-type of Na3V2(PO4)3 is regarded as a potential cathode candidate for advanced sodium ion batteries (SIBs), it behaves undesirable rate performance and low cyclability, which are resulted from its poor electronic conductivity. Here, we utilized conductive polyaniline (PANI) grown in situ to obtain the hard carbon coated porous Na3V2(PO4)3@C composite (NVP@C@HC) with a typically simple and effective sol-gel process. Based on the restriction of double carbon layers, the NVP size decreases distinctly, which can curtail sodium ion diffusion distance and enhance the electronic conductivity...
December 4, 2017: ACS Applied Materials & Interfaces
Yingqian Chen, Johann Lüder, Man-Fai Ng, Michael Sullivan, Sergei Manzhos
We present the first atomistic-scale simulation of the discharge process of polymeric cathode materials for electrochemical batteries in solid state. The oxidation of polyaniline (PANI) and of cyano groups (CN) functionalized PANI induced by coordination to the electrolyte anions is computed and voltage curves are estimated. To deal with the large required numbers of atoms and structures, a combination of molecular dynamics and density functional tight binding (DFTB) is used. The DFTB is benchmarked to density functional theory (DFT) calculations using different functionals to confirm its accuracy...
December 4, 2017: Physical Chemistry Chemical Physics: PCCP
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