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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
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 operated with inorganic TiO2-SiO2 and CuO-TiO2-SiO2 composite nanofibers as templates...
April 19, 2017: Nanotechnology
Xin Tian, Fanbin Meng, Fanchen Meng, Xiangnan Chen, Yifan Guo, Ying Wang, Wenjun Zhu, Zuowan Zhou
We designed a dual chirality hierarchical structure to achieve a synergistically enhanced effect in microwave absorption via the hybridization of nanomaterials. Herein, polyaniline (PANi) nanorods with tunable chirality are grown on helical carbon nanotubes (HCNTs), a typical nanoscale chiral structure, through in situ polymerization. The experimental results show that the hierarchical hybrids (PANi@HCNTs) exhibit distinctly dual chirality and display a significant enhancement in electromagnetic losses compared to either pure PANi or HCNTs...
April 18, 2017: ACS Applied Materials & Interfaces
Lijuan Bai, Yuhan Chen, Yan Bai, Yongjie Chen, Jing Zhou, Ailong Huang
Tuberculosis caused by Mycobacterium tuberculosis (MTB) is still a major threat to global public health. However, the existing methods for MTB detection are usually complicated and time consuming with unsatisfactory sensitivity and specificity. In this work, a relatively simple and ultrasensitive electrochemical aptasensor based on novel signal generation and amplification was constructed for the determination of MTB antigen MPT64. The coil-like fullerene (C60)-doped polyaniline (C60-PAn) nanohybrids with large surface area, abundant active groups and excellent electric performance were synthesized and used both as new redox nanoprobe and catalyst for the generation and amplification of electrochemical signal for the first time...
April 12, 2017: Biomaterials
Jeongjoon Lee, Inseon Lee, Jahyun Nam, Dong Soo Hwang, Kyung-Min Yeon, Jungbae Kim
Acylase was immobilized and stabilized on carboxylated polyaniline nanofibers (cPANFs) for the development of antifouling nanobiocatalysis with high enzyme loading and stability. Acylase 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 of Mag-EPC was 75 and 300 times higher than those of CA and EC, respectively, representing the improved enzyme loading in the form of Mag-EPC...
April 17, 2017: ACS Applied Materials & Interfaces
Kalyan Ghosh, Chee Yoon Yue, Md Moniruzzaman Sk, Rajeeb Kumar Jena
We have fabricated high energy density all-solid-state flexible asymmetric supercapacitor by using a facile novel 3-D hollow urchin shaped coaxial manganese dioxide@polyaniline (MnO2@PANI) composite as positive electrode and 3-D graphene foam (GF) as negative electrode materials with PVA/KOH gel electrolyte. The coaxial MnO2@PANI composite was fabricated by hydrothermal route followed by oxidation without use of an external oxidant. The formation mechanism of the 3-D hollow MnO2@PANI composite occurs first by nucleation and growth of the MnO2 crystal species via a dissolution-recrystallization and oriented attachment mechanisms, and then followed by oxidation of aniline monomers on the MnO2 crystalline template...
April 17, 2017: ACS Applied Materials & Interfaces
Chenjing Jin, Jie Han, Fangyuan Chu, Xiaoxia Wang, Rong Guo
Au@Fe3O4@PANI hybrid shells with controllable PANI coatings as advanced supported catalysts have been fabricated. Specifically, Fe3O4 and Au nanoparticles were assembled on SiO2 templates, followed by conducting polymer polyaniline (PANI) coating, leading to the formation of Au@Fe3O4@PANI hybrid shells after template removal. The resultant supported Au nanocatalysts not only maintain hollow structures, but also possess high saturation magnetization (65.46 emu/g). Catalytic tests towards the reduction of 4-nitrophenol in the presence of NaBH4 indicate that PANI and Fe3O4 not only endow high stability and recyclability, but also can largely improve the catalytic activity of Au nanoparticles due to their synergetic effects...
April 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Jinping Wang, Xiaojuan Pang, Xiaoxiao Tan, Yilin Song, Li Liu, Qing You, Qi Sun, Fengping Tan, Nan Li
In this study, we report a strategy for integrating hyaluronic acid (HA), polyaniline (PANI), WS2 nanodots (WS2), and chlorin e6 (Ce6) into a single nanoplatform (HA-WS2@PANI/Ce6) for fluorescence, photoacoustic, and computed tomography multi-modality imaging-guided trimodal photothermal/radiation/photodynamic combination therapy of tumors. The WS2 nanodot core is used as the radiosensitizer with the PANI shell as the hyperthermal agent and the photosensitizer reservoir. HA and Ce6 were adsorbed on the outer shell for tumor targeting and photodynamic therapy, respectively...
April 13, 2017: Nanoscale
Alonso Gamero-Quijano, Cheryl Karman, Neus Vilà, Gregoire Herzog, Alain Walcarius
The growth of vertically aligned and ordered polyaniline nanofilaments is controlled by potentiostatic polymerization through hexagonally-packed and oriented mesoporous silica films. In such small pore template (2 nm in diameter), quasi single PANI chains are likely to be produced. From chronoamperometric experiments and using films of various thicknesses (100-200 nm), it is possible to evidence the electropolymerization transients, wherein each stage of polymerization (induction period, growth and overgrowth of polyaniline on mesoporous silica films) is clearly identified...
April 11, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Eun Hee Jo, Hee Dong Jang, Hankwon Chang, Sun Kyung Kim, Ji-Hyuk Choi, Cong Min Lee
Crumpled graphene (CGR) is considered as a promising supercapacitor material toward high power and energy density because it could overcome disadvantages of two-dimensional (2D) GR sheets such as aggregation during electrode fabrication process, reduction of the available surface area and limitation of the electron and ion transport. Even though CGR showed good results, carbon materials are limited in terms of their capacitance performance. Here, we report highly enhanced supercapacitor materials by fabricating a three-dimensional (3D) composite composed of CGR, carbon nanotube (CNT), and polyaniline (PANI)...
April 6, 2017: ChemSusChem
JingHong Li, Hui Xu
Exploration of volatile organic compounds (VOCs) generated by lung cell lines is a powerful and non-invasive tool for the detection of potential volatile biomarkers of lung cancer. In this study, a simple and sensitive solid phase microextraction-gas chromatography-mass spectrometry (SPME-GC-MS) method was developed for the determination of VOCs in the headspace gas of lung cell lines. For the purpose of preconcentration, a novel polyaniline/polypyrrole/graphene oxide (PANI/PPy/GO) coating was prepared on the surface of stainless steel fiber via in-situ electrochemical deposition for the first time...
May 15, 2017: Talanta
N T Brannelly, A J Killard
The level of ammonia in blood is relevant in a number of medical conditions. While ammonia is a marker of dysfunction, elevated ammonia is itself a serious medical emergency and can lead to significant and permanent neurological impairment if not addressed quickly. Blood ammonia testing is typically performed in the central laboratory. While a number of point of care devices have been developed, these are based on classical enzymatic or colorimetric principles and have not been widely adopted. In this work, an electrochemical sensor device was developed for measuring blood ammonia...
May 15, 2017: Talanta
Mingguang Ma, Huiju Wang, Qi Zhen, Min Zhang, Xinzhen Du
A novel solid-phase microextraction (SPME) fiber was fabricated by direct electrodeposition of polyaniline (PANI) coated the titania nanotube arrays in situ grown on the titanium wire followed by carbonization at 500°C under nitrogen atmosphere. The resulting titanium-based fiber with nitrogen-enriched carbonaceous material coated titania nanotubes (N-C/TiO2NTs/Ti) showed better extraction performance for ultraviolet (UV) filters among model aromatic compounds compared with common PANI as well as commercial polydimethylsiloxane and polyacrylate coatings...
May 15, 2017: Talanta
Chongdai Luo, Yangyang Wang, Xuemeng Li, Xueqin Jiang, Panpan Gao, Kang Sun, Jianhua Zhou, Zhiguang Zhang, Qing Jiang
Saliva contains important personal physiological information that is related to some diseases, and it is a valuable source of biochemical information that can be collected rapidly, frequently, and without stress. In this article, we reported a new and simple localized surface plasmon resonance (LSPR) substrate composed of polyaniline (PANI)-gold hybrid nanostructures as an optical sensor for monitoring the pH of saliva samples. The overall appearance and topography of the substrates, the composition, and the wettability of the LSPR surfaces were characterized by optical and scanning electron microscope (SEM) images, infrared spectra, and contact angles measurement, respectively...
March 17, 2017: Nanomaterials
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 28, 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
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