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Chao Wang, Zhi-Yi Hu, Heng Zhao, Wenbei Yu, Sijia Wu, Jing Liu, Lihua Chen, Yu Li, Bao-Lian Su
We report three types of conducting polymers (CPs), polyaniline (PANI), polypyrrole (PPY) and poly (3,4-ethylenedioxythiophene) (PEDOT) to modify the surface of the CdS nanorods to probe their photocorrosion inhibition and photocatalytic hydrogen production. Various characterizations, such as high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV) and density function theory (DFT) calculations have been conducted to reveal the intrinsic structure of the as-constructed CPs@CdS (@ means CPs at the surface of CdS) core-shell nanorods...
March 6, 2018: Journal of Colloid and Interface Science
Zishen Wang, Qin'e Zhang, Shichuan Long, Yangxi Luo, Peikai Yu, Zhibing Tan, Jie Bai, Baihua Qu, Yang Yang, Jia Shi, Hua Zhou, Zong-Yuan Xiao, Wenjing Hong, Hua Bai
We apply direct ink writing for the three-dimensional (3D) printing of polyaniline/reduced graphene oxide (PANI/RGO) with PANI/GO gel as printable ink. The PANI/GO gel inks for 3D printing are prepared via self-assembly of PANI and GO in a blend solvent of N-methyl-2-pyrrolidinone and water, and offer both shaping capability, self-sustainability, and electrical conductivity after reduction of GO. Interdigitated electrodes are fabricated by using the PANI/GO ink in 3D printing, and a planar solid-state supercapacitor is constructed, which exhibits high performance with specific capacitance of 1329 mF cm-2...
March 15, 2018: ACS Applied Materials & Interfaces
Hagit Sade, Jean-Paul Lellouche
Two tungsten disulfide (WS₂)-based core-shell nanocomposites were fabricated using readily available reagents and simple procedures. The surface was pre-treated with a surfactant couple in a layer-by-layer approach, enabling good dispersion of the WS₂ nanostructures in aqueous media and providing a template for the polymerization of a silica (SiO₂) shell. After a Stöber-like reaction, a conformal silica coating was achieved. Inspired by the resulting nanocomposite, a second one was prepared by reacting the surfactant-modified WS₂ nanostructures with aniline and an oxidizing agent in an aqueous medium...
March 10, 2018: Nanomaterials
Hongcai Gao, Leigang Xue, Sen Xin, John B Goodenough
A safe potassium rechargeable battery of high energy density and excellent cycling stability is demonstrated. The cell contained a polyaniline cathode into which the anion component of the electrolyte salt is inserted on charge, extracted on discharge; but the K+ ion of a KPF6 salt is plated/stripped on the potassium-metal anode. The use of a p-type polymer cathode increases the cell voltage. By replacing the organic-liquid electrolyte in a glass-fiber separator by a polymer-gel electrolyte of cross-linked poly(methyl methacrylate), a dendrite-free potassium anode can be plated/stripped and the electrode/electrolyte interface stabilized...
March 13, 2018: Angewandte Chemie
Jinjie Wang, Liubing Dong, Chengjun Xu, Danyang Ren, Xinpei Ma, Feiyu Kang
Polymorphous supercapacitors were constructed from flexible three-dimensional (3D) carbon network/polyaniline (PANI)/MnO2 composite textile electrodes. The flexible textile electrodes were fabricated through a layer-by-layer construction strategy: PANI, carbon nanotubes (CNTs) and MnO2 were deposited on activated carbon fiber cloth (ACFC) in turn through electro-polymerization process, "dipping and drying" method and in situ chemical reaction, respectively. In the fabricated ACFC/PANI/CNTs/MnO2 textile electrodes, ACFC-CNT hybrid framework serves as porous and electrically conductive 3D network for rapid transmission of electrons and electrolyte ions, while ACFC, PANI and MnO2 are high-performance supercapacitor electrode materials...
March 12, 2018: ACS Applied Materials & Interfaces
Dengjie Zhong, Xinrong Liao, Yaqi Liu, Nianbing Zhong, Yunlan Xu
A new electrode which embedded polyaniline (PANI) in petaline NiO (NiO@PANI-CF) was prepared through in-situ growth and in-situ polymerization. The NiO@PANI-CF integrated the high capacitive character of NiO and the high conductivity of PANI, which effectively increased electricity generation capacity of NiO@PANI-MFC. The maximum output power density and the charge transfer resistance of NiO@PANI-MFC were 1078.8 mW·m-2 and 10.4 Ω respectively, which were 6.6 times and 68% lower than that of CF-MFC respectively...
February 1, 2018: Bioresource Technology
Aming Xie, Mengxiao Sun, Kun Zhang, Yilu Xia, Fan Wu
Conducting polymers at nano scales endow materials with special optical, electrical, and magnetic properties. The crucial factor to construct and regulate the micro-structures of conducting polymers is the inducing reagent, particular in its chemical structure, such active sites, self-assembling properties. In this paper, we design and synthesize an amphiphile bearing tetrazole moiety on its skeleton, and use this amphiphile as an inducing reagent to prepare and regulate the micro-structures of a series of conducting polymers including polypyrrole (PPy), polyaniline (PANi), poly(3,4-ethylenedioxythiophene) (PEDOT) and poly(p-phenylenediamine) (PpPD)...
March 7, 2018: Nanotechnology
Girma Selale Geleta, Zhen Zhao, Zhenxin Wang
In this study, we developed a novel reduced graphene oxide/molybdenum disulfide/polyaniline@gold nanoparticles-based electrochemical aptasensor (termed as RGO/MoS2 /PANI@AuNPs/Apt) for detection of aflatoxin B1 (AFB1 ). The RGO/MoS2 /PANI nanocomposites were synthesized and characterized by multiple techniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), infrared spectroscopy (FTIR), UV-visible spectroscopy, and X-ray photoelectron spectroscopy (XPS). A glassy carbon electrode (GCE) was then modified by the RGO/MoS2 /PANI nanocomposites, coated with a chitosan (Cs) film, and followed by AuNPs attachment for immobilizing the AFB1 aptamers...
March 6, 2018: Analyst
Ankur Chattopadhyay, Poonam Rani, Rajendra Srivastava, Purbarun Dhar
The present article discusses the typical influence of grafted conducting polymers in the mesoscale pores of dielectric particles on the static and dynamic electrorheology and electro-viscoelastic behavior of corresponding colloids. Nanocrystalline meso-nanoporous zeolite has been prepared by chemical synthesis and subsequently polyaniline (PANI) coating has been implemented. Electrorheological (ER) suspensions have been formed by dispersing the nanoparticles in silicone oil and their viscoelastic behaviors are examined to understand the nature of such complex colloidal systems under electric fields...
February 24, 2018: Journal of Colloid and Interface Science
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) nanofiber merged into silver doped iron oxide (Ag-Fe2O3) nanocomposite modified glassy carbon electrode. The synthesized ternary composite material (Ag-Fe2O3@PANI) was characterized by UV-visible spectroscopy, FT-IR spectroscopy, EDX, HR-TEM, XRD and TGA analysis. The nanocomposite modified electrode shows an exceptional electrocatalytic activity and reversibility to the oxidation of UA in 0...
March 2, 2018: Journal of Physical Chemistry. B
Ameen Uddin Ammar, Muhammad Shahid, Muhammad Khitab Ahmed, Munawar Khan, Amir Khalid, Zulfiqar Ahmad Khan
Coating is one of the most effective measures to protect metallic materials from corrosion. Various types of coatings such as metallic, ceramic and polymer coatings have been investigated in a quest to find durable coatings to resist electrochemical decay of metals in industrial applications. Many polymeric composite coatings have proved to be resistant against aggressive environments. Two major applications of ferrous materials are in marine environments and in the oil and gas industry. Knowing the corroding behavior of ferrous-based materials during exposure to these aggressive applications, an effort has been made to protect the material by using polymeric and ceramic-based coatings reinforced with nano materials...
February 25, 2018: Materials
Marjan Tanzifi, Mohammad Tavakkoli Yaraki, Mojtaba Karami, Samira Karimi, Asieh Dehghani Kiadehi, Kianoush Karimipour, Shaobin Wang
In the present study, a polyaniline/carboxymethyl cellulose/TiO2 nanocomposite (PAn/CMC/TiO2 ) was synthesized by a polymerization method, and was used for adsorption of Congo Red from aqueous solution. The effects of operational parameters of the adsorption process including pH, initial dye concentration, temperature, adsorbent dosage, and adsorption time on adsorption efficiency were investigated, and response surface methodology was used for their optimization. Optimal adsorption conditions were determined at pH of 2...
February 21, 2018: Journal of Colloid and Interface Science
Maryam Lashgari, Yadollah Yamini
Modified stainless-steel wires with a layer of polyaniline conductive polymer, were coated by electrochemical deposition with Zn/Al layered double hydroxide to make solid-phase microextraction fibers. The coating layer was also electrochemically deposited on the inner surface of a stainless-steel tube. Then, ten prepared fibers were put inside the inner-coated tube to make a fiber-in-tube solid phase microextraction device. The device was applied for the extraction of caffeine (1,3,7-trimethylxanthine) from domestic wastewater samples...
March 1, 2018: Journal of Separation Science
Agustín Lorenzo, Waldemar A Marmisollé, Eliana M Maza, Marcelo Ceolín, Omar Azzaroni
Molecular design and preparation of redox active films displaying mesoscopic levels of organization represents one of the most actively pursued research areas in nanochemistry. These mesostructured materials are not only of great interest at the fundamental level because of their unique properties but they can also be employed for a wide range of applications such as electrocatalysts, electronic devices, and electrochemical energy conversion and storage. Herein, we introduce a simple and straightforward strategy to chemically modify electrode surfaces with self-assembled electroactive polyelectrolyte-surfactant complexes...
March 1, 2018: Physical Chemistry Chemical Physics: PCCP
Sousna Sahnoun, Mokhtar Boutahala
The present work focused on the performance of chitosan/polyaniline (Cht-PANI) composite for removing tartrazine dye from aqueous solutions. The adsorbent was characterized using SEM, XRD, FTIR, and TGA/DTA techniques. The effects of pH, initial dye concentration, contact time, and temperature on azo dye removal were studied. The kinetics and isotherm of tartrazine removal follow pseudo-second-order kinetics and the Freundlich isotherm, respectively. The maximum adsorption capacity is 584.0 mg/g. The thermodynamic parameters were calculated and the negative ΔG0 and positive ΔH0 indicate that the adsorption processes are spontaneous and endothermic in nature...
February 24, 2018: International Journal of Biological Macromolecules
Anindita Bora, Kiranjyoti Mohan, Simanta Doley, Swapan Kumar Dolui
Flexible energy storage devices are the need of the hour with the advent of flexible electronics. So far, flexible supercapacitors based on graphene analogues usually have low operating potential windows. To this end, two dissimilar electrode materials with complementary potential ranges are employed to obtain an optimum cell voltage of 1.8V. Low temperature organic sol-gel method is used to prepare functionalized reduced graphene oxide aerogel (rGOA): Ag nanorod functionalized rGOA acts as anode while polyaniline nanotube functionalized rGOA acts as cathode...
February 22, 2018: ACS Applied Materials & Interfaces
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
Dandan Yuan, Lei Tian, Zhida Li, Hong Jiang, Chao Yan, Jing Dong, Hongjun Wu, Baohui Wang
Herein, we report the solar thermal electrochemical process (STEP) aniline oxidation in wastewater for totally solving the two key obstacles of the huge energy consumption and passivation film in the electrochemical treatment. The process, fully driven by solar energy without input of any other energies, sustainably serves as an efficient thermoelectrochemical oxidation of aniline by the control of the thermochemical and electrochemical coordination. The thermocoupled electrochemical oxidation of aniline achieved a fast rate and high efficiency for the full minimization of aniline to CO 2 with the stability of the electrode and without formation of polyaniline (PAN) passivation film...
February 15, 2018: Scientific Reports
Tao Jin, Yanmin Wang, Hong Yin, Xiaojuan Hao
Poly(amidoamine)(PAMAM)/epoxy/acetic acid-doped polyaniline (PAni) coatings were successfully prepared and coated on magnesium alloy substrates. X-ray diffraction pattern, Fourier transform infrared spectroscopy, scanning electron microscopy technique were used to characterize the composition and morphology of acetic acid-doped PAni and composite coatings. The effect of the usage amount of doped PAni on the corrosion protection performance was evaluated with electrochemical measurement in 3.5 wt.% NaCl solutions...
July 1, 2018: Journal of Nanoscience and Nanotechnology
Ying Wu, Jixiao Wang, Bin Ou, Song Zhao, Zhi Wang, Shichang Wang
Electrochemical polymerization of aniline is one of the most promising methods to prepare polyaniline (PANI) materials. However, during this process, the electrolyte solution must be replaced after electropolymerization of a certain time because of the generation and the accumulation of the by-products, which have significant effects on the morphology, purity and properties of PANI products. Treatment and recycling of the used electrolyte solution are worthwhile to study to reduce the high treatment cost of the used electrolyte solution containing aniline and its polymerization by-products...
February 12, 2018: Nanomaterials
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