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Mohamed Rabia, H S H Mohamed, Mohamed Shaban, S Taha
Lead sulfide (PbS) and polyaniline (PANI) nano/microparticles were prepared. Then, PANI/PbS core-shell nano/microcomposites (I, II, and III) were prepared by oxidative polymerization of different aniline concentrations (0.01, 0.03, and 0.05 M), respectively, in the presence of 0.05 M PbS. FT-IR, XRD, SEM, HR-TEM, and UV-Vis analyses were carried out to characterize the samples. From the FT-IR data, there are redshifts in PbS and PANI nano/microparticles bands in comparison with PANI/PbS nano/microcomposites...
January 18, 2018: Scientific Reports
Prabhakarn Arunachalam, Maged N Shaddad, Mohamed A Ghanem, Abdullah M Al-Mayouf, Mark T Weller
Photoanodes fabricated by the electrophoretic deposition of a thermally prepared zinc tantalum oxynitride (ZnTaO₂N) catalyst onto indium tin oxide (ITO) substrates show photoactivation for the oxygen evolution reaction (OER) in alkaline solutions. The photoactivity of the OER is further boosted by the photodeposition of cobalt phosphate (CoPi) layers onto the surface of the ZnTaO₂N photoanodes. Structural, morphological, and photoelectrochemical (PEC) properties of the modified ZnTaO₂N photoanodes are studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet visible (UV-Vis) diffuse reflectance spectroscopy, and electrochemical techniques...
January 18, 2018: Nanomaterials
Guang-Li Wang, Fang Yuan, Tiantian Gu, Yuming Dong, Qian Wang, Wei-Wei Zhao
Herein we report a general and novel strategy for high-throughput photoelectrochemical (PEC) enzymatic bioanalysis on the basis of enzyme-initiated quinone-chitosan conjugation chemistry (QCCC). Specifically, the strategy was illustrated by using a model quinones-generating oxidase of tyrosinase (Tyr) to catalytically produce 1,2-bezoquinone or its derivative, which can easily and selectively be conjugated onto the surface of the chitosan deposited PbS/NiO/FTO photocathode via the QCCC. Upon illumination, the covalently attached quinones could act as electron acceptors of PbS quantum dots (QDs), improving the photocurrent generation and thus allowing the elegant probing of Tyr activity...
January 18, 2018: Analytical Chemistry
Neerugatti KrishnaRao Eswar, Sangeeta Adhikari, Praveen C Ramamurthy, Giridhar Madras
The present work demonstrates an extremely proficient and robust study of efficient interfacial charge transfer through plasmonic Ag decorated Bi2O3 hierarchical photoanodes for the photoelectrochemical treatment of chlorinated phenols. Unique 2D flake-like Bi2O3 hierarchical nanostructures were grown onto a fluorine-doped tin oxide (FTO) substrate by a simple chemical bath deposition method using triethanolamine as complexing agent. The formation of Bi2O3 on FTO was governed by the decomposition of a nucleated bismuth-hydroxyl complex (Bi2O1-x(OH)x) and modification to the electrode was carried out by the deposition of Ag via a chemical reduction method using hydrazine hydrate...
January 18, 2018: Physical Chemistry Chemical Physics: PCCP
José Otavio Goulart Pecly
The alternative use of effluent turbidity to determine the dilution field of a domestic marine outfall located off the city of Rio de Janeiro was evaluated through field work comprising fluorescent dye tracer injection and tracking with simultaneous monitoring of sea water turbidity. A preliminary laboratory assessment was carried out with a sample of the outfall effluent whose turbidity was measured by the nephelometric method before and during a serial dilution process. During the field campaign, the dye tracer was monitored with field fluorometers and the turbidity was observed with an optical backscattering sensor interfaced to an OEM data acquisition system...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Mahmoud H Abu Elella, Riham R Mohamed, Marwa M Abdel-Aziz, Magdy W Sabaa
The present study is imported to solve two critical problems we face in our daily life which are microbial pollution and colon cancer. One pot green synthesis of a water soluble polyelectrolyte complex (PEC) between cationic polysaccharide as N,N,N-trimethyl chitosan chloride (TMC) and anionic polymer as poly (acrylic acid) (PAA) in presence of silver nanoparticles to yield (TMC/PAA/Ag) nanocomposites with different Ag weight ratios. Structure of TMC, PAA and TMC/PAA (PEC) were proved via different analysis tools...
January 12, 2018: International Journal of Biological Macromolecules
Sheng Ye, Chunmei Ding, Ruotian Chen, Fengtao Fan, Ping Fu, Heng Yin, Xiuli Wang, Zhiliang Wang, Pingwu Du, Can Li
It has been anticipated that learning from nature photosynthesis is a rational and effective way to develop artificial photosynthesis system, but it is still a great challenge. Here, we assembled a photoelectrocatalytic system by mimicking the functions of photosystem II (PSII), with BiVO4 semiconductor as a light-harvester protected by a layered double hydroxide (NiFeLDH) as a hole storage layer, a partially oxidized graphene (pGO) as biomimetic tyrosine for charge transfer, and molecular Co cubane as oxygen evolution complex...
January 17, 2018: Journal of the American Chemical Society
Amani M Elsayed, Aseel H Khaled, Mayyas M Al Remawi, Nidal A Qinna, Hussam Abu Farsakh, Adnan A Badwan
Oral insulin delivery that better mimics physiological pathways is a necessity as it ensures patient comfort and compliance. A system which is based on a vehicle of nano order where positively charged chitosan interacts with negatively charged insulin and forms a polyelectrolyte complex (PEC) solubilizate, which is then solubilized into an oily phase of oleic acid, labrasol, and plurol oleaque-protects insulin against enzymatic gastrointestinal reduction. The use of an anionic fatty acid in the oily phase, such as oleic acid, is thought to allow an interaction with cationic chitosan, hence reducing particle size...
January 16, 2018: Marine Drugs
Gill Sang Han, Seongha Lee, Matthew Duff, Fen Qin, Jung-Kun Lee
We report highly bendable and efficient perovskite solar cells (PSCs) that use thermally oxidized layer of Ti metal plate as an electron transport layer (ETL). The power conversion efficiency (PCE) of flexible PSCs reaches 14.9 % with short-circuit current density (Jsc) of 17.9 mA/cm2, open circuit voltage (Voc) of 1.09, and fill factor (ff) of 0.74. Moreover, the Ti metal based PSCs exhibit a superior fatigue resistance over ITO/PEC substrate. Flexible PSCs maintain 100 % of their initial PCE even after PSCs are bent 1000 times at the bending radius of 4 mm...
January 16, 2018: ACS Applied Materials & Interfaces
Weichun Huang, Chenyang Xing, Yunzheng Wang, Zhongjun Li, Leiming Wu, Dingtao Ma, Xiaoyu Dai, Yuanjiang Xiang, Jianqing Li, Dianyuan Fan, Han Zhang
Two-dimensional (2D) bismuth(iii) sulfide (Bi2S3) nanosheets as non-toxic graphene-like nanomaterials were successfully fabricated by a facile liquid phase exfoliation (LPE) method. A robust photodetector employing a Bi2S3 nanosheet film has been fabricated for the first time via a facile fabrication process on an ITO-coated glass. UV-Vis and Raman spectroscopy techniques were carried out and they confirmed the inherent optical and physical properties of Bi2S3 nanosheets. Photoelectrochemical (PEC) measurements demonstrate that a significantly higher photocurrent density (42 μA cm-2) and enhanced photoresponsivity (210 μA W-1), at a lower bias potential in alkaline solution, of the Bi2S3 nanosheet-based photodetector are achieved, compared with those of other 2D nanomaterial-based photodetectors under light irradiation...
January 15, 2018: Nanoscale
Yingpu Bi, Beibei Zhang, Lei Wang, Yajun Zhang, Yong Ding
Photoelectrochemical (PEC) water splitting is a promising method for storing solar energy in the form of hydrogen fuel, but greatly hindered by the sluggish kinetics of the oxygen evolution reaction (OER). Herein, a facile solution impregnation method is developed for growing highly crystalline β-FeOOH nanolayers with ultrathin thickness (2 nm) and abundant oxygen vacancies on BiVO4 photoanodes, which exhibited a remarkable photocurrent density of 4.3 mA cm-2 at 1.23 V (vs. reversible hydrogen electrode (RHE), AM 1...
January 14, 2018: Angewandte Chemie
Rong Wu, Gao-Chao Fan, Li-Ping Jiang, Jun-Jie Zhu
The ability to rapidly detect apoptotic cells and accurately evaluate therapeutic effects is significant in cancer research. To address this target, a biocompatible, ultrasensitive photoelectrochemical (PEC) cytosensing platform was developed based on electrochemically reduced graphene (EG)/ZnIn2S4 co-sensitized TiO2 coupled with specific recognition between apoptotic cells and phosphatidylserine (PS)-binding peptide (PSBP). In this strategy, HL-60 cells were selected as a model, and C005, nilotinib and imatinib were selected as apoptosis inducers to show cytosensing performance...
January 12, 2018: ACS Applied Materials & Interfaces
Sung Gyu Han, Sang Youn Chae, Si Young Lee, Byoung Koun Min, Yun Jeong Hwang
Here, we successfully synthesized a Ta3N5 thin film using a simple metal-organic-precursor decomposition process followed by its conversion to nitride and studied its photoelectrochemical (PEC) properties to understand charge separation on the surface. Newly synthesized Ta3N5 photoanodes showed a significant difference in the PEC activity in relation to the annealing temperature under ammonia flow, although similar light absorption properties or electronic states were obtained. Charge separation related PEC properties were analyzed using intensity modulated photocurrent density spectroscopy (IMPS) and photocurrent measurements in the absence/presence of scavengers...
January 12, 2018: Physical Chemistry Chemical Physics: PCCP
Daniele Impieri, Michela Gamberini, Lauretta Passarelli, Marcello G P Rosa, Claudio Galletti
The exposed surface of the superior parietal lobule in macaque brain contains two architectonically defined areas named PEc and PE. The aim of the present study is the characterization of thalamic afferents of these two areas. For this purpose, retrograde neuronal tracers were injected, or placed in crystal form, in areas PEc and PE. We found that the two areas show a similar pattern of thalamic inputs, mainly originating from Lateral Posterior (LP), Pulvinar (Pul), Ventral Posterior Lateral (VPL), and Ventral Lateral (VL) nuclei, all structures known to be involved in visual, somatosensory, and/or sensorimotor processing...
January 10, 2018: Journal of Comparative Neurology
Ling Zhang, Yi-Fan Ruan, Yan Yu Liang, Wei-Wei Zhao, Xiao-Dong Yu, Jing-Juan Xu, Hong-Yuan Chen
On the basis of a special synergized dual-catalysis mechanism, this work reports the preparation of BiOI-based heterojunction and its use for cathodic photoelectrochemical (PEC) oxidase biosensing, which, unexpectedly, revealed that H2O2 impacted greater than O2. Specifically, BiOI layer was in situ formed on the substrate through an impregnating hydroxylation method for the following coupling with the model enzyme of glucose oxidases (GOx). The constructed cathodic PEC enzyme sensor exhibited good analytical performance of rapid response, high stability, and good selectivity...
January 10, 2018: ACS Applied Materials & Interfaces
Yan Wang, Bernd Nowack
A lot of research studies have endeavored to investigate the ecotoxicological hazards of engineered nanomaterials (ENMs). However, little is known regarding the actual environmental risks of ENMs, combining both hazard and exposure data. The aim of this study is to quantify the environmental risks for nano-Al2 O3 , nano-SiO2 , nano iron oxides, nano-CeO2 , and quantum dots by comparing the predicted environmental concentrations (PEC) with the predicted no effect concentrations (PNEC). The PEC values of these five ENMs in fresh waters in 2020 for northern Europe and southeastern Europe were taken from a published dynamic probabilistic material flow analysis model...
January 9, 2018: Environmental Toxicology and Chemistry
Yu-Xiang Dong, Juntao Cao, Bing Wang, Shu-Hui Ma, Yan Ming Liu
The detection of biomarkers with high sensitivity and accuracy in real biosamples remains challenging. Herein, a universal spatial-resolved photoelectrochemical (PEC) ratiometry for biodetection of prostate specific antigen (PSA) as model biomarker was designed for the first time based on dual-electrodes array modified by CdS@g-C3N4 heterojunction coupled with CuS quantum dots (QDs) as signal amplification tags. Specifically, a new kind of photoactive material, CdS@g-C3N4 p-n heterojunction with highly photoelectric conversion efficiency and good chemical stability, was synthesized and immobilized on two spatial-resolved electrodes (WE1 and WE2)...
January 9, 2018: ACS Applied Materials & Interfaces
Bing Wang, Jun-Tao Cao, Yu-Xiang Dong, Fu-Rao Liu, Xiao-Long Fu, Shu-Wei Ren, Shu-Hui Ma, Yan-Ming Liu
An ascorbic acid oxidase (AAO)-ascorbic acid bioevent-based electron donor consumption mode was introduced into the PEC bioassay for the first time. Ternary hybrid bismuth sulfide/silver sulfide/TiO2 nanotube arrays as the photoelectrode coupled with AAO attached to SiO2 as a dual signal quenching strategy were employed for sensitivity enhancement.
January 9, 2018: Chemical Communications: Chem Comm
Martin Lamothe, Pierre McDuff, Yves D Pastore, Michel Duval, Serge Sultan
OBJECTIVES: To assess the feasibility and acceptability of a mindfulness-based stress reduction (MBSR)-based intervention and determine if the intervention is associated with a significant signal on empathy and emotional competencies. DESIGN: Two pre-post proof-of-concept studies. SETTING: Participants were recruited at the University of Montreal's Psychology Department (Study 1) and the CHU Sainte-Justine Department of Hematology-Oncology (Study 2)...
January 5, 2018: BMJ Open
Udaka K de Silva, Kunal Choudhuri, Amanda C Bryant-Friedrich, Yakov Lapitsky
Polyelectrolyte complexes (PECs) form through the association of oppositely charged polymers and, due to their attractive properties, such as their mild/simple preparation and stimulus-sensitivity, attract widespread interest. The diverse applications of these materials often require control over PEC shapes. As a versatile approach to achieving such control, we report a new photolithographic directed assembly method for tailoring their structure. This method uses aqueous solutions of a polyelectrolyte, an oppositely charged monomer and a photoinitiator...
January 4, 2018: Soft Matter
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