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Anup Kumar Sasmal, Arpan Kumar Nayak, Prashant Kartikeya, Debabrata Pradhan, Tarasankar Pal
Herein, for the first time we applied metal-metal bond energy factor for the evolution of porous Se-Te alloy. Porous Se-Te material has been prepared from their elemental states only through heating-cooling process in silicone oil without using any reagent, surfactant or capping agent. Surprisingly the reaction occurred at much lower temperature (240 °C) than the m.p. (450 °C) of Te0. The nucleation and growth have been clarified by means of varied bond energy for the first time. Difference in bond energy between hetero metal-metal bond (Se-Te) and homo metal-metal (Se-Se) directs nucleation and growth towards the fabrication of porous structure even from their elemental state where low angle grain boundary (LAGB) and high angle grain boundary (HAGB) movements play their governing roles...
November 17, 2017: ACS Applied Materials & Interfaces
Jae-Wook Lee, Sojin Park, Hae-Kyoung Han, Myung Chan Gye, Eun-Yi Moon
Phthalates are widely used as plasticizers that influence sexual and reproductive development. Here, we investigated whether di-(2-ethylhexyl) phthalate (DEHP) affects macrophage polarization that are associated with tumor initiation and progression. No changes were observed in LPS- or ConA-stimulated in vitro spleen B or T cell proliferation for 48 h, respectively. In contrast, macrophage functions were inhibited in response to DEHP for 12 h as judged by LPS-induced H2O2 and NO production and zymosan A-mediated phagocytosis...
November 13, 2017: Environmental Pollution
Xiaobin Liu, Zhenyu Wang, Peng Chen, Huanfu Zhou, Ling Bing Kong, Chunming Niu, Wenxiu Que
Nitrogen-doping approach has been intensively adopted to improve the various properties of metal oxides-especially for adjusting energy band structure and extending photo-response range of oxide photocatalyst. However, nitrogen doped behavior is still unintelligible and complex due to the diversity of the compositions and crystal structures. In this work, new insights into electronic structure and photoelectrochemical property of nitrogen-doping HNb3O8 behaviors were presented. On the one hand, we utilized an in-situ experimental strategy to ascertain the effect of nitrogen-doping on the energy band and photoelectrochemical (PEC) property of HNb3O8 and nitrogen-doped HNb3O8 (N-HNb3O8)...
November 16, 2017: ACS Applied Materials & Interfaces
Jie Song, Shuo Wu, Xinlan Yang, Jingli Yuan
Graphene nanodisks with good conductivity and plenty of edge sites were synthesized to load glucose oxidase (GRD-GOD) and coupled with a Mn(2+) doped CdS quantum dot (QD) modified TiO2 electrode (CdS:Mn/TiO2) for a highly sensitive photoelectrochemical (PEC) immunoassay. The specific immune-recognition behaviour can bring the GRD-GOD labelled antigen into the antibody immobilized CdS:Mn/TiO2 interface and dramatically enhance the photocurrent response via a dual signal amplification strategy. First, graphene nanodisks with a strong electron transfer capacity can improve the conductivity of both the insulating protein layers and the CdS:Mn/TiO2 matrix, thus facilitating the regeneration of trapped carriers and hot electrons in the CdS:Mn QD films and enhancing the PEC performance...
November 15, 2017: Analyst
Kivia M Albano, Vânia R Nicoletti
Consumers' preference for products with reduced levels of fat increased in the last years. Proteins and polysaccharides have an important role due to their functional and interaction properties because, when combined in ratios and pH of higher potential for electrostatic interactions they may act as emulsifiers or stabilizers. This study evaluated the ultrasound impact on the electrostatic interaction between pectin (PEC) and whey protein concentrate (WPC) at different WPC:PEC ratios (1:1 to 5:1), and its effect on the emulsification and stability of emulsions formulated with WPC:PEC blends (1:1, 4:1) at low soybean oil contents (5 to 15%)...
March 2018: Ultrasonics Sonochemistry
Wei-Wei Zhao, Jing-Juan Xu, Hong-Yuan Chen
As an essential direction of photoelectrochemical (PEC) bioanalysis, PEC immunoassays have attracted substantial research scrutiny for its desirable combination of the inherent sensitivity of the PEC bioanalysis and the specific bioaffinity properties of the immunomolecules. The past five years have witnessed substantial advances toward the development of PEC immunoassays, and numerous approaches to advanced PEC immunoassays have been established. Although the summaries on specific topics, such as the PEC DNA biosensors, PEC aptasensing, PEC enzymatic biosensors or the general development of PEC bioanalysis, have been presented in previous reviews, no in-depth survey has yet been made for addressing specifically on the important category of PEC immunoassays...
November 14, 2017: Analytical Chemistry
Jie Wei, Aori Qileng, Yun Yan, Hongtao Lei, Shengsen Zhang, Weipeng Liu, Yingju Liu
An ultrasensitive photoelectrochemical (PEC) immunoassay based on multiple signal amplification strategy was fabricated for the detection of microcystin-LR (MC-LR). The CdS/TiO2 nanorod arrays (CdS/TiO2 NRAs) modified FTO electrode, which can weaken the self-oxidation by photogenerated holes of CdS nanoparticles, and limit the recombination of electron-hole pairs and broaden optical absorption of TiO2 NRAs, was used as a visible-light driven material to immobilize antigens. Then, Fe3O4 nanoparticles/polydopamine (Fe3O4@PDA) was used as the carrier to load secondary antibody (Ab2) and horseradish peroxidase (HRP), where Fe3O4 nanoparticles and HRP can synergistically accelerate the oxidation of 4-chloro-1-naphthol (4-CN) by H2O2 to produce biocatalytic precipitation (BCP) on the surface of modified electrode...
November 22, 2017: Analytica Chimica Acta
Ján Škoviera, Ivan Černušák, Florent Louis, Pavel Neogrády
Correlated ab initio methods [CASPT2 and R-CCSD(T)] in conjunction with the ANO-RCC basis sets in large contraction were used to calculate potential energy curves (PECs) of the ground and excited electronic states of CsH(+) (doublets and quartets) with the inclusion of the scalar relativistic effects and spin-orbit interaction. The ground X(2)Σ(+) state is a rather fragile van der Waals molecular ion. The binding energy of this X(2)Σ(+) state provided by both computational methods is estimated to be 0.02-0...
November 9, 2017: Journal of Molecular Modeling
Meng-Jie Li, Ying-Ning Zheng, Wen-Bin Liang, Ruo Yuan, Ya-Qin Chai
Ultrasensitive and rapid quantification of the universal energy currency adenosine triphosphate (ATP) is an extremely critical mission in clinical applications. In this work, a "signal-off" photoelectrochemical (PEC) biosensor was designed for ultrasensitive ATP detection based on a fullerene (C60)-decorated Au nanoparticle@MoS2 (C60-Au NP@MoS2) composite material as a signal indicator and a p-type PbS quantum dot (QD) as an efficient signal quencher. Modification of wide band gap C60 with narrow band gap MoS2 to form an ideal PEC signal indicator was proposed, which could significantly improve photocurrent conversion efficiency, leading to a desirable PEC signal...
November 17, 2017: ACS Applied Materials & Interfaces
Yuhan Zhu, Zuwei Xu, Kai Yan, Haibo Zhao, Jingdong Zhang
CuO-Cu2O heterojunction was synthesized via a one-step flame spray pyrolysis (FSP) process and employed as photoactive material in construction of a photoelectrochemical (PEC) sensing device. The surface analysis showed that CuO-Cu2O nanocomposites in the size less than 10 nm were formed and uniformly distributed on the electrode surface. Under visible light irradiation, the CuO-Cu2O-coated electrode exhibited admirable cathodic photocurrent response, owing to the favorable property of the CuO-Cu2O heterojunction such as strong absorption in the visible region and effective separation of photogenerated electron-hole pairs...
November 13, 2017: ACS Applied Materials & Interfaces
Xianbao Bu, Guo Wang, Yang Tian
In this work, we found that foreign metallic ion (In(3+)) treatment enhanced the photoelectrochemical (PEC) activity of hematite nanosheets aligning on a substrate without joining the host lattice. Scanning electron microscopy (SEM) observation indicated that the In(3+) ion treatment nearly did not change the size and thickness of the hematite nanosheets during solvothermal synthesis. However, the treatment reduced nanosheet stacking and increased the active surface area of the hematite photoanode. Careful combined analyses involving Energy Dispersive X-ray (EDX) spectroscopy, X-ray photoelectron spectroscopy (XPS) and powder X-ray diffraction (XRD) confirmed that In(3+) ions were not doped in the hematite nanosheets...
November 16, 2017: Nanoscale
Yuxing Xu, Ailong Li, Tingting Yao, Changtong Ma, Xianwen Zhang, Jafar Hussain Shah, Hongxian Han
Converting sunlight to solar fuels by artificial photosynthesis is an innovative science and technology for renewable energy. Light harvesting (LH), photogenerated charge separation and transfer (CST), and catalytic reactions (CR) are the three primary steps in the processes of solar energy to chemical energy (SE-CE) conversion. Among them, the CST is the key "energy pump and delivery" step in determining the overall solar energy conversion efficiency. Efficient CST is always the priority concern in designing and assembling artificial photosynthesis systems for solar fuels production...
November 4, 2017: ChemSusChem
Gurudayal, Laurence M Peter, Lydia H Wong, Fatwa F Abdi
Photoelectrochemical (PEC) water oxidation is considered to be the rate-limiting step of the two half-reactions in light-driven water splitting. Consequently, considerable effort has focused on improving the performance of photoanodes for water oxidation. While these efforts have met with some success, the mechanisms responsible for improvements resulting from photoanode modifications are often difficult to determine. This is mainly caused by the entanglement of numerous properties that influence the PEC performance, particularly processes that occur at the photoanode/electrolyte interface...
November 14, 2017: ACS Applied Materials & Interfaces
Dasom Jeon, Hyunwoo Kim, Cheolmin Lee, Yujin Han, Minsu Gu, Byeong-Su Kim, Jungki Ryu
Artificial photosynthesis is considered one of the most promising solutions to modern energy and environmental crises. Considering that it is enabled by multiple components through a series of photoelectrochemical processes, the key to successful development of a photosynthetic device depends not only on the development of novel individual components but also on the rational design of an integrated photosynthetic device assembled from them. However, most studies have been dedicated to the development of individual components due to the lack of a general and simple method for the construction of the integrated device...
November 13, 2017: ACS Applied Materials & Interfaces
Sonia Lefnaoui, Nadji Moulai-Mostefa, Madiha M Yahoum, Sarah N Gasmi
The purpose of this study was to develop suitable matrix type transdermal drug delivery systems of Ketotifen fumarate (KF) as antiasthmatic drugs. Chitosan-alginate polyelectrolyte complex (PEC) films were used as drug release regulators for KF. Antihistaminic films with variable PEC compositions were prepared using different ratios of chitosan (CTS) to sodium alginate (ALG). Propylene glycol (PG) was used as plasticizer; Tween 80 (T80) and Span 20 (S20) were used as permeability enhancers. Nine formulations were obtained by film casting method and characterized in terms of weight uniformity, thickness, folding endurance, moisture lost, and moisture absorption...
November 3, 2017: Drug Development and Industrial Pharmacy
Pengjie Liu, Maojun Zheng, Qiang Li, Liguo Ma, Faze Wang, Dongkai Jiang, Jingnan Song, Yuxiu You, Li Ma, Wenzhong Shen
Gallium phosphide nanopore arrays with unique three-dimensional interior architectures (3D GaP NPs) are fabricated by electrochemical etching in a neutral solution. As the photoanodes for photoelectrochemical (PEC) hydrogen production, the 3D GaP NPs exhibited a larger photocurrent density (5.65 mA cm(-2) at 0 V vs. RHE, which is 58.3 and 2.3 times as large as that of the planar wafer and the NPs reported by our group in our previous work respectively) and a lower onset potential (-0.58 V vs. RHE, shifting negatively nearly 300 mV compared with its counterparts in the previous work)...
November 3, 2017: Chemical Communications: Chem Comm
Huimei Da, Hongyan Liu, Yingning Zheng, Ruo Yuan, Yaqin Chai
We developed a novel "signal-off" photoelectrochemical (PEC) aptasensor based on an aptamer bridged DNA network structure for the sensitive detection of vascular endothelial growth factor (VEGF165), using g-C3N4 as photoactive material. The DNA network provides an excellent platform for the immobilization of methylene blue (MB), which can facilitate the electron transport through the DNA helix structure and suppress the recombination of electron-hole pairs generated by g-C3N4. In the presence of the target VEGF165, the DNA network can be destroyed adequately by the recognition between VEGF165 and the aptamer, resulting in the release of MB...
October 17, 2017: Biosensors & Bioelectronics
Huan Wang, Yinghua Liang, Li Liu, Jinshan Hu, Wenquan Cui
Novel graphitic carbon nitride nanoparticles (NPs)-wrapped TiO2 nanotube arrays (NTAs) (g-C3N4/TiO2) were fabricated by a two-step method including an electrochemical anodization technique followed by impregnation under vacuum using urea as precursor. The as-prepared photoelectrode exhibited outstanding photoelectric properties and excellent photelectrocatalytic (PEC) performance for the degradation of phenol under stimulated solar light, which was due to the enhanced light absorption property and improved charge separation efficiency...
October 24, 2017: Journal of Hazardous Materials
Lifei Xi, Christoph Schwanke, Dong Zhou, Dorian Drevon, Roel van de Krol, Kathrin M Lange
Solar water splitting is a potentially scalable method to store solar energy in the form of renewable hydrogen gas. In this study, we demonstrate that the photoelectrochemical (PEC) performance of hematite photoanodes can be improved by modification with the oxygen evolution catalyst CoBi. The current density at 1.23 V of the pristine hematite under one sun is 0.88 mA cm(-2) and it increases to 1.12 mA cm(-2) after CoBi modification (∼27% improvement). The presence of a CoBi cocatalayst layer is proposed to improve the oxygen evolution reaction (OER) kinetics and also to prevent electron-hole recombination at the surface via passivating surface defects as well as suppressing the tunneling of electrons from the hematite core, thus improving the photocurrents and resulting in a negative shift of photocurrent onset potentials...
November 2, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Yifan Ye, James E Thorne, Chenghao Wu, Yi-Sheng Liu, Chun Du, Ji-Wook Jang, Erik Y Liu, Dunwei Wang, Jinghua Guo
Photoelectrochemical (PEC) water splitting holds the potential as a direct route for solar energy conversation and storage. The performance of a PEC device is strongly influenced by the electronic properties of the photonanode surface. It has been shown that the synthesis methods can have profound impact on the electronic properties and PEC performance of various photo-electrode materials such as hematite. In this work, soft X-ray spectroscopic techniques, including O K-edge XAS, and Fe L-edge XAS/XES, have been employed to investigate how the synthesis methods impact the electronic structure of resulting hematite materials...
November 1, 2017: Journal of Physical Chemistry. B
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