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Xiaoling Yang, Kexin Qiao, Fang Liu, Xiaoling Wu, Miyi Yang, Jing Li, Haixiang Gao, Sanbing Zhang, Wenfeng Zhou, Runhua Lu
In this research, a novel method using magnetic mixed hemimicelles dispersive solid-phase extraction (MMHDSPE) based on C16mimBr-coated attapulgite/polyaniline-polypyrrole/Fe3O4 (ATP/PANI-PPY/Fe3O4) nanocomposites were investigated for enrichment and separation of three acaricides in fruit juice. In this method, we combined the simplicity and speed of dispersive solid-phase extraction, the advantages of mixed hemimicelles and the facility of the phase separation of the magnetic nanoparticles to develop a simple, rapid, sensitive, and effective method for detecting target analytes from the juice samples...
May 1, 2017: Talanta
Renwei Liu, Suna Fan, Dongdong Xiao, Jin Zhang, Mengzhou Liao, Shansheng Yu, Fanling Meng, Baoli Liu, Lin Gu, Sheng Meng, Guangyu Zhang, Weitao Zheng, Shuxin Hu, Ming Li
Organic two-dimensional (2D) crystals are fundamentally important for development of future devices. Despite that more than a half of man-made products contain polymers, 2D crystals consisting of long linear chains have yet to be explored. Here we report on the fabrication of 2D polyaniline (PANI) crystals via rational electrochemical polymerization followed by liquid-phase exfoliation. The 2D PANI is molecularly thin (~0.8 nm) and composed of PANI chains with a number-average molecular weight of ~31000. The chains are parallel to each other with the benzene rings standing almost vertically to the surface, implying a face-to-face arrangement of the neighboring chains held together by abundant pi-pi interactions augmented with hydrogen bonds...
February 15, 2017: Nano Letters
Mingkai Liu, Bomin Li, Hang Zhou, Cong Chen, Yuqing Liu, Tianxi Liu
A 3D "skeleton/skin" carbon aerogel-polyaniline (CA-PANI) hybrid with vertically aligned pores exhibits an extraordinary rate capability. A high capacity retention (95%) has been achieved when the current density is increased from 1 to 100 A g(-1).
February 15, 2017: Chemical Communications: Chem Comm
Chaoqun You, Hongshui Wu, Mingxin Wang, Yawen Zhang, Jingwen Wang, Yanghui Luo, Lihai Zhai, Bai-Wang Sun, Xiangyang Zhang, Jin Zhu
Biodegradable polymeric nanoparticles have caused a rapidly growing interest as one of the most promising agents applied to drug delivery. Functional and core crosslinked poly (ethylene glycol) with poly (ε-caprolactone) (PEG5k-PCL10k) block copolymer and lecithin as biodegradable polymer doping polyaniline to assemble nanoparticles which were prepared at present work for targeted delivery and controlled release of cisplatin as a common anti-tumor drug. The morphology of polyaniline nanoparticles were determined by dynamic light scattering and the prepared nanoparticles show a suitable size of 83±1 nm and a uniform spherical shape...
February 13, 2017: Chemistry: a European Journal
Hyemin Kwon, Dajung Hong, Ilhwan Ryu, Sanggyu Yim
A major limitation of polyaniline (PANi) electrodes for supercapacitors is the slow rate of ion transport during redox reactions and the resultant easy saturation of areal capacitance with film thickness. In this study, three-dimensionally (3D)-arrayed PANi nanospheres with highly roughened surface nanomorphology were fabricated to overcome this limitation. A hierarchical nanostructure was obtained by polymerizing aniline monomers on a template of 3D-arrayed polystyrene (PS) nanospheres and appropriate oxidative acid doping...
February 13, 2017: ACS Applied Materials & Interfaces
Zhaoyang Liu, Shaohua Liu, Renhao Dong, Sheng Yang, Hao Lu, Akimitsu Narita, Xinliang Feng, Klaus Müllen
Micro-supercapacitors (MSCs) based on mesoporous polyaniline patterned graphene are demonstrated. The synergic effect from both electron-double-layer-capacitive graphene and pseudocapacitive mesoporous-polyaniline leads to outstanding MSC device performances, in regard to excellent volumetric capacitance and rate capabilities, which further result in high power density of 600 W cm(-3) , suggesting opportunities for future portable and wearable power supplies in diverse applications.
February 3, 2017: Small
Attila Szöllősi, Ágoston Hoschke, Judit M Rezessy-Szabó, Erika Bujna, Szilárd Kun, Quang D Nguyen
A new bio-anode containing gel-entrapped bacteria in alginate/polyaniline/TiO2/graphite composites was constructed and electrically investigated. Alginate as dopant and template as well as entrapped gel was used for immobilization of microorganism cells. Increase of polyaniline concentration resulted an increase in the conductivity in gels. Addition of 0.01 and 0.02 g/mL polyaniline caused 6-fold and 10-fold higher conductivity, respectively. Furthermore, addition of 0.05 g/mL graphite powder caused 10-fold higher conductivity and 4-fold higher power density, respectively...
January 23, 2017: Chemosphere
M Jesús García-Fernández, Sara Sancho-Querol, M Mercedes Pastor-Blas, Antonio Sepúlveda-Escribano
Three different conducting polymers, polythiophene (PT), polypirrol (PPY) and polyaniline (PANI) have been synthesized via oxidative chemical polymerization in aqueous media, in such a way that the synthesis protocol did not involve any toxic solvents. They have been tested in the abatement of nitrates from an aqueous solution without the need of any metal catalyst. The N-containing polymers (PANI and PPy) were able to remove nitrates to a level that accomplishes the European legislation requirements; however, the nature of each polymer greatly influenced the process mechanism...
May 15, 2017: Journal of Colloid and Interface Science
Damia Mawad, Catherine Mansfield, Antonio Lauto, Filippo Perbellini, Geoffrey W Nelson, Joanne Tonkin, Sean O Bello, Damon J Carrad, Adam P Micolich, Mohd M Mahat, Jennifer Furman, David Payne, Alexander R Lyon, J Justin Gooding, Sian E Harding, Cesare M Terracciano, Molly M Stevens
Electrically active constructs can have a beneficial effect on electroresponsive tissues, such as the brain, heart, and nervous system. Conducting polymers (CPs) are being considered as components of these constructs because of their intrinsic electroactive and flexible nature. However, their clinical application has been largely hampered by their short operational time due to a decrease in their electronic properties. We show that, by immobilizing the dopant in the conductive scaffold, we can prevent its electric deterioration...
November 2016: Science Advances
Ali Reza Ghiasvand, Fatemeh Yazdankhah
A polyaniline/multi-wall carbon nanotubes (PANI/MWCNT) composite was electrodeposited on the interior surface of a platinized stainless steel capillary needle and used to prepare an inside needle capillary adsorption trap (INCAT) device. The platinization expanded the interior adsorbing surface of the needle and made it more porous and cohesive for nanocomposite film. The nanocomposite was characterized using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). The fabricated INCAT was fixed into a cooling capsule to fabricate a cooling-assisted INCAT (CA-INCAT) system...
March 3, 2017: Journal of Chromatography. A
Cuiping Li, Tianzhu Zhou, Huiling Jin, Yangyang Lian, Wenmei Han
Halloysite@polyaniline (HA@PANI) hybrid nanotubes are synthesized by the in-situ chemical polymerization of aniline on halloysite clay nanotubes. By facilely tuning the dopant acid, pH and apparent weight proportion for aniline (ANI) and halloysite (HA) nanotubes in the synthesis process, PANI with tuned oxidation state, doping extent and content are in-situ growing on halloysite nanotubes. The reaction system's acidity is tuned by dopant acid, such as HCl, H2SO4, HNO3 and H3PO4. The adsorption result shows the fabricated HA@PANI hybrid nanotubes can effectively adsorb Cr(VI) oxyanion and the adsorption ability changes according to the dopant acid, pH and apparent weight proportion for ANI and HA in the synthesis process...
January 25, 2017: ACS Applied Materials & Interfaces
Leila Mohammadi Amirabad, Mohammad Massumi, Mehdi Shamsara, Iman Shabani, Afshin Amari, Majid Mossahebi Mohammadi, Simzar Hosseinzadeh, Saeid Vakilian, Sarah K Steinbach, Mohammad R Khorramizadeh, Masoud Soleimani, Jalal Barzin
In the embryonic heart, electrical impulses propagate in a unidirectional manner from the sinus venosus and appear to be involved in cardiogenesis. In this work, aligned and random polyaniline/polyetersulfone (PANI/PES) nanofibrous scaffolds doped by Camphor-10-sulfonic acid (β) (CPSA) were fabricated via electrospinning and used to conduct electrical impulses in a unidirectional and multidirectional fashion, respectively. A bioreactor was subsequently engineered to apply electrical impulses to cells cultured on PANI/PES scaffolds...
February 15, 2017: ACS Applied Materials & Interfaces
Prapha Arnnok, Nopbhasinthu Patdhanagul, Rodjana Burakham
The applicability of polyaniline (PANI)-modified zeolite NaY as a sorbent for multi-class pesticides extraction was investigated. The sorbent had a sorption capacity of 833mgkg(-1) sorbent and preconcentration factor of 42 in the mixture of twenty pesticides. The PANI-coated zeolite NaY was successfully created via oxidative polymerization of aniline onto the surface of the zeolite. The sorbent was applied for dispersive solid phase extraction (DSPE) of commonly used pesticides belonging to five different chemical groups, involving carbamate, organophosphate, sulfonylurea, pyrethroid and neonicotinoid...
March 1, 2017: Talanta
Xin Zhao, Hao Wu, Baolin Guo, Ruonan Dong, Yusheng Qiu, Peter X Ma
Injectable self-healing hydrogel dressing with multifunctional properties including anti-infection, anti-oxidative and conductivity promoting wound healing process will be highly desired in wound healing application and its design is still a challenge. We developed a series of injectable conductive self-healed hydrogels based on quaternized chitosan-g-polyaniline (QCSP) and benzaldehyde group functionalized poly(ethylene glycol)-co-poly(glycerol sebacate) (PEGS-FA) as antibacterial, anti-oxidant and electroactive dressing for cutaneous wound healing...
January 11, 2017: Biomaterials
Haiyin Li, Jiafu Chang, Ting Hou, Feng Li
It is well-known that the horseradish peroxidase- (HRP-) mimicking DNAzyme, namely, hemin/G-quadruplex, can effectively catalyze the polymerization of aniline to form DNA-guided polyaniline. Meanwhile, polyaniline exhibits extraordinary electrical, electrochemical, and redox properties, as well as excellent SPR signal-enhancing ability. Herein, we report a novel ultrasensitive surface plasmon resonance (SPR) biosensor based on HRP-mimicking DNAzyme-catalyzed in situ formation of polyaniline for signal amplification, using bleomycin (BLM) as the proof-of-concept analyte...
January 3, 2017: Analytical Chemistry
Christina O Baker, Xinwei Huang, Wyatt Nelson, Richard B Kaner
Polyaniline is a conducting polymer with incredible promise, but it has had limited use due to poor reaction control and processability associated with conventional morphologies. Polyaniline nanofibers, on the other hand, have demonstrated, through manufacturing techniques discovered during the past decade, increased processability, higher surface area, and improved consistency and stability in aqueous dispersions, which are finally allowing for expanded commercial development of this promising polymer. This review explores some intriguing applications of polyaniline nanofibers, as well as the advantages and remaining challenges in developing better products using polyaniline in this new morphology...
January 18, 2017: Chemical Society Reviews
Boon-Hong Wee, Tong-Fei Wu, Jong-Dal Hong
Here we describe a facile and scalable method for preparing defect-free graphene sheets exfoliated from graphite using the positively charged polyelectrolyte precursor poly(p-phenylenevinylene) (PPV-pre) as a stabilizer in an aqueous solution. The graphene exfoliated by PPV-pre was apparently stabilized in the solution as a form of graphene/PPV-pre (denoted to GPPV-pre), which remains in a homogeneous dispersion over a year. The thickness values of 300 selected 76% GPPV-pre flakes ranged from 1 to 10 nm, corresponding to between one and a few layers of graphene in the lateral dimensions of 1 to 2 μm...
January 30, 2017: ACS Applied Materials & Interfaces
Bing Xia, Bin Wang, Jisen Shi, Yu Zhang, Qi Zhang, Zhenyu Chen, Jiachen Li
: To develop photothermal and biodegradable nanocarriers for combined chemo-photothermal therapy of cancer, polyaniline/porous silicon hybrid nanocomposites had been successfully fabricated via surface initiated polymerization of aniline onto porous silicon nanoparticles in our experiments. As-prepared polyaniline/porous silicon nanocomposites could be well dispersed in aqueous solution without any extra hydrophilic surface coatings, and showed a robust phototherml effect under near-infrared (NIR) laser irradiation...
January 6, 2017: Acta Biomaterialia
Fan Jing, Miao Chen, Yanping Tang, Zhixiao Xu, Tao Huang, Yuezeng Su, Dongqing Wu
Nitrogen-doped mesoporous carbon nanosheets (NMCNs) with uniform hexagonal structures are fabricated via the thermal treatment of polyaniline enwrapped cobalt hydroxide (Co(OH)2) nanosheets and the subsequent acid etching of the resulting composites. It is found that the morphologies, poroisties and compositions of the NMCNs are greatly dependent on the ratio of the added aniline and Co(OH)2 nanosheets, which can in turn affect the electrochemical behavior of the NMCNs. As the electrocatalyst for oxygen reduction reaction in alkaline media, the NMCNs obtained with the aniline/Co(OH)2 ratio of ∼1...
April 15, 2017: Journal of Colloid and Interface Science
Donglin Li, Yonggang Yang, Chaozheng Li, Yufang Liu
The dispersion-corrected density functional theory (DFT-D3) is used to investigate the mechanism of mesoporous pulp waste (MPW) and polyaniline (PANI) adsorptive removal methyl orange (MO) dye from their aqueous solutions. The results are absolutely reliable because of the sufficiently accurate method although such big systems are studied. It is demonstrated that hydrogen bond and Van Der Waals interactions play a significant role in MO adsorption by MPW and PANI. For MO adsorption by MPW, hydrogen bond and Van Der Waals interactions are both weakened in S1 state...
January 5, 2017: Environmental Research
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