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metal nanoparticle

Nir Waiskopf, Yuval Ben-Shahar, Uri Banin
Hybrid semiconductor-metal nanoparticles (HNPs) manifest unique combined and often synergetic properties stemming from the materials combination. These structures exhibit spatial charge separation across the semiconductor-metal junction upon light absorption, enabling their use as photocatalysts. So far, the main impetus of photocatalysis research in HNPs addresses their functionality in solar fuel generation. Recently, it was discovered that HNPs are functional in efficient photocatalytic generation of reactive oxygen species (ROS)...
April 14, 2018: Advanced Materials
Junzhe Dong, Junzhi Ye, Dessy Ariyanti, Yixuan Wang, Shanghai Wei, Wei Gao
The modification of titanium dioxide (TiO2 ) using noble metal nanoparticles is considered as a promising technique to make electrode with outstanding photocatalytic performance. In this paper, self-organized anodic TiO2 nanotube arrays were decorated with well-distributed small Cu nanoparticles through a novel technique that combines magnetron sputtering and thermal dewetting. The obtained nanocomposite catalyst exhibited 4-fold increase in the photodegradation rate of methylene blue aqueous solution under solar light irradiation than anatase TiO2 prepared with same anodization conditions...
April 9, 2018: Chemosphere
Joseph Bennett, Diamond Jones, Xu Huang, Robert J Hamers, Sara E Mason
The rapid increase in use of Li-ion batteries in portable electronics has created a pressing need to understand the environmental impact and long-term fate of electonic waste (e-waste) products such as heavy and/or reactive metals. The type of e-waste that we focus on here are the complex metal oxide nanomaterials that compose Li-ion battery cathodes. While in operation the complex metal oxides are in a hermetically sealed container. However, at the end of life, improper disposal can cause structural transformations such as dissolution and metal leaching, resulting in a significant exposure risk to the surrounding environment...
April 13, 2018: Environmental Science & Technology
Bence Nagy, Mohammed Al-Rawhani, Boon Chong Cheah, Michael P Barrett, David R S Cumming
Scalable immunoassay multiplexing offers a route to creating rapid point-of-care (POC) diagnostics. We present a method for multiplexing immunoassays on the surface of a complementary metal-oxide-semiconductor (CMOS) sensor array integrated circuit (IC) without the use of physical separators such as wells or channels. Major advantages of using a CMOS sensor array include low mass-manufacturing costs, the possibility to multiplex multiple assays on a single IC and improved signal when averaging multiple sensors, along with providing a platform where wash steps can be incor-porated to maximize selectivity and sensitivity compared to paper based lateral flow immunoassay...
April 13, 2018: ACS Sensors
Zeng Zhen, Mingfen Wen, Boxuan Yu, Gang Ye, Xiaomei Huo, Yuexiang Lu, Jing Chen
Oxidant-regulated polymerization of dopamine was exploited, for the first time, for effective surface engineering of the well-defined cylindrical pores of nuclear track-etched membranes (NTEMs) to develop novel catalytic membrane reactor. Firstly, in the presence of strong oxidant, controlled synthesis of polydopamine (PDA) with tunable particle size was achieved, allowing a homogeneous deposition to the confined pore channels of NTEMs. The PDA interfaces rich in catechol and amine groups provided enhanced hydrophilicity to promote mass transport across the membrane and abundant nucleation sites for formation and stabilization of metallic nanoparticles (NPs)...
April 13, 2018: ACS Applied Materials & Interfaces
Daniil A Fadeev, Ivan V Oladyshkin, Vyacheslav A Mironov
We demonstrate theoretically that ultrafast heating of metal nanoparticles by the laser pulse should lead to the generation of coherent terahertz (THz) radiation during the heat redistribution process. It is shown that after the femtosecond laser pulse action, the time-dependent gradient of the electronic temperature induces low-frequency particle polarization with the characteristic timescale of about fractions of a picosecond. In the case of the directed metallic pattern, the THz pulse waveform can be controlled by changing the geometry of the particle...
April 15, 2018: Optics Letters
Vasyl Aleksiichuk, Sergiy Omelchuk, Liudmyla Sokurenko, Rostyslav Kaminsky, Oleksandr Kovalchuk, Yuri Chaikovsky
Lead as any heavy metals may be found in soil, water, air, and is used in everyday life. Once in the body, it causes toxic effect, making the liver, which is one of the main organs of detoxification, suffer. Recently, the study of the action of not only ionic forms of lead, but also its nanoparticles, has become topical. The study aims at determining changes in the liver of rats and biochemical changes in their blood both at late term of exposure to nanoparticles of lead compounds and in the post-exposure period...
April 13, 2018: Microscopy Research and Technique
Sergey Lepeshov, Mingsong Wang, Alex Krasnok, Oleg Kotov, Tianyi Zhang, He Liu, Taizhi Jiang, Brian A Korgel, Mauricio Terrones, Yuebing Zheng, Andrea Alu
Two-dimensional semiconducting transition metal dichalcogenides (TMDCs) are extremely attractive materials for optoelectronic applications in the visible and near-IR range. Coupling these materials to optical nanocavities enables advanced quantum optics and nanophotonic devices. Here, we address the issue of resonance coupling in hybrid exciton-polariton structures based on single Si nanoparticles (NPs) coupled to monolayer (1L) WS2. We predict strong coupling regime with a Rabi splitting energy exceeding 110 meV for a Si NPs covered by 1L-WS2 at the magnetic optical Mie resonance due to the symmetry of the mode...
April 13, 2018: ACS Applied Materials & Interfaces
Binxing Yu, Jill I Tracey, Zhongkai Cheng, Martin Vacha, Deirdre M O'Carroll
The optical properties of metal-film-coupled nanoparticles (NPs) are highly sensitive to physical and optical interactions between the NPs and the spacer medium in the gap between the NP and metal film. Here, we investigate the physical and optical interactions between gold NPs (AuNPs) and semiconducting conjugated polymer thin-film spacers in a "sphere-on-plane" type metal-film-coupled NP system, and their influence on the plasmonic scattering of individual AuNPs. We choose two different conjugated polymers: one with an absorption spectrum that is resonant with the plasmonic modes of the AuNPs and another that is non-resonant...
April 13, 2018: Physical Chemistry Chemical Physics: PCCP
Akira Nordmeier, Augustus Merwin, Donald F Roeper, Dev Chidambaram
The production of nanoparticles through biosynthesis is a reliable, non-toxic, and sustainable alternative to conventional chemical and physical methods of production. While noble metals, such as palladium, gold, and silver, have been formed via bioreduction, biologically-induced reduction of electroactive elements to a metallic state has not been reported previously. Herein, we report the reduction of an electroactive element, molybdenum, via microbial reduction using Clostridium pasteurianum. C. pasteurianum was able to reduce 88% of the added Mo6+ ions...
February 13, 2018: Chemosphere
Jing Xu, Junyao Yang, Agata Nyga, Mazdak Ehteramyan, Ana Moraga, Yuanhao Wu, Lingfang Zeng, Martin M Knight, Julia C Shelton
Histological assessments of synovial tissues from patients with failed CoCr alloy hip prostheses demonstrate extensive infiltration and accumulation of macrophages, often loaded with large quantities of particulate debris. The resulting adverse reaction to metal debris (ARMD) frequently leads to early joint revision. Inflammatory response starts with the recruitment of immune cells and requires the egress of macrophages from the inflamed site for resolution of the reaction. Metal ions (Co2+ and Cr3+ ) have been shown to stimulate the migration of T lymphocytes but their effects on macrophages motility are still poorly understood...
April 9, 2018: Acta Biomaterialia
Nassim Ben Brahim, Mélanie Poggi, Jean-Christophe Lambry, Naim Bel Haj Mohamed, Rafik Ben Chaâbane, Michel Negrerie
We aimed to quantify the interaction of water-soluble-functionalized CdS quantum dots (QDs) with metal cations from their composition and physical properties. From the diameter of thioglycerol-capped nanoparticles (TG-CdS QDs) measured by electronic microscopy ( D = 12.3 ± 0.3 nm), we calculated the molecular mass of the individual particle MAQD = (3 ± 0.5) × 106 g·mol-1 and its molar absorption coefficient ε450 = 21 × 106 M-1 ·cm-1 . We built a three-dimensional model of the TG-CdS QDs in agreement with the structural data, which allowed us to quantify the number of thioglycerol grafted chains to ∼2000 per QD...
April 12, 2018: Inorganic Chemistry
Mengmeng Chen, Lu Han, Jie Zhou, Chunyi Sun, Chengying Hu, Xinlong Wang, Zhongmin Su
Metal-organic frameworks (MOFs) as famous porous materials in CO2 adsorption, their performance in CO2 reduction attract researchers' great attention. A classical Co-MOF, Co-ZIF-9, has been proposed as a novel photocatalyst for reducing CO2 into chemical feedstocks. Herein, Co-ZIF-9 with rod-like structure was obtained through reflux. Ultra-small silver nanoparticles (Ag NPs, smaller than 5 nm) were doped into Co-ZIF-9 by photodeposition method. With the assistant of photosensitizer, the resultant composites Ag@Co-ZIF-9 show catalytic reactivity in converting CO2 into CO under visible-light irradiation...
April 12, 2018: Nanotechnology
Ruptanu Banerjee, Amit Jaiswal
Lateral flow immunoassay (LFIA) technology is a paper-based, point-of-care strip biosensor designed to detect a specific analyte in a given sample. This type of assay is now of great interest to researchers for its cost-effectiveness, simplicity, portability and rapidness of detection of analytes, including but not limited to areas such as agriculture, food, biomedicine and pathogen detection. Various nanoparticles (such as metal nanoparticles, carbon-based nanoparticles, quantum dots, lanthanides and up-converting phosphor) functionalized by an antibody to detect an analyte protein or molecular marker present in the surface of an infectious pathogen are used for in LFIAs...
April 12, 2018: Analyst
Xiuyun Zhai, Mingtong Chen, Wencong Lu
For safely using the untested metal oxide nanoparticles (MONPs) in industrial and commercial applications, it is important to predict their potential toxicities quickly and efficiently. In this research, the quantitative structure-activity relationship (QSAR) model based on support vector regression (SVR) with a residual bootstrapping technique (BTSVR) was proposed to predict the toxicities of MONPs. It was found that the main features influencing the toxicities of MONPs were RAatom (atomic ratio of oxygen to metal), ΔHm (enthalpy of melting), and Ecoh (cohesive energy)...
April 12, 2018: Toxicology Mechanisms and Methods
Li Xu, Zijie Zhang, Xiaoqiang Fang, Yibo Liu, Biwu Liu, Juewen Liu
Metal coordination with organic ligands often produce crystalline metal-organic frameworks (MOF) and sometimes amorphorous nanoparticles. In this work, we explore a different type of material from the same chemistry: hydrogels. Lanthanides are chosen as the metal component because of their important technological applications and continously tunable properties. Adenosine monophosphate (AMP) and lanthanides form two types of coordination materials: the lighter lanthanides from La3+ to Tb3+ form nanoparticles, while the rest heavier ones initially form nanoparticles but later spontaneously transform to hydrogels...
April 12, 2018: ACS Applied Materials & Interfaces
M A Himyan, M Penchal Reddy, F Ubaid, R A Shakoor, A M A Mohamed
Al-metal matrix composites (AMMCs) reinforced with diverse volume fraction of SiC nanoparticles were synthesized using microwave sintering process. The effects of the reinforcing SiC particles on physical, microstructure, mechanical, and electrical properties were studied. The phase, microstructural, and surface analyses of the composites were systematically conducted using X-ray diffraction (XRD), scanning electron microscope (SEM), and surface profilometer techniques, respectively. The microstructural examination revealed the homogeneous distribution of SiC particles in the Al matrix...
2018: Scanning
Hideyuki Takahashi, Hironari Fujiki, Shun Yokoyama, Takayuki Kai, Kazuyuki Tohji
To apply CuInSe₂ (CIS)-based printable solar batteries; an aqueous phase synthesis method of Cu-In (CI) alloy nanoparticles is studied. Metal complexes in the original solution are restricted to homogenized species by utilizing calculations. For example; [(Cu2+ )(ASP2- )₂] [ASP: the "body (C₄H₅O₄N)" of aspartic acid (C₄H₇O₄N)] is predominant in the pH 6-13 region (CASP /CCu > 6); while In complexes can be restricted to [(In3+ )(OH- )(EDTA4- )] (pH 10-12; CEDTA /CIn = 2) and/or [(In3+ )(ASP2- )₂] (pH 7-9; CASP /CIn = 5)...
April 6, 2018: Nanomaterials
Huijun Liang, Qiuxia Meng, Xiaobing Wang, Hucheng Zhang, Jianji Wang
The Nanoplasmonic metal-driven photocatalytic activity depends heavily on the spacing between metal nanoparticles (NPs) and semiconductors, and this work shows that ethylene glycol (EG) is an ideal candidate for interface spacer. Controlling the synthetic systems at pH=3, the composite of Ag NPs with EG-stabilized amorphous TiO2 (Ag/TiO2-3) was synthesized by the facile light-induced reduction. It is verified that EG spacers can set up the suitable geometric arrangement in the composite: the twin hydroxyls act as the stabilizers to bridge Ag NPs and TiO2 together; and the non-conductive alkyl chains consisted only of two CH2 are able to separate the two building blocks completely from the direct contact, and more provide the shortest channels for efficient transfers of radiation energies into reach TiO2...
April 9, 2018: ACS Applied Materials & Interfaces
Qing Lu, Qi Zhao, Tianye Yang, Chengbo Zhai, Dongxue Wang, Mingzhe Zhang
In this work, oxygen-doped boron nitride nanoparticles with room-temperature ferromagnetism have been synthesized by a new, facile, and efficient method. There are no metal magnetic impurities in the nanoparticles analyzed by X-ray photoelectron spectroscopy. The boron nitride nanoparticles exhibit a parabolic shape with increase in the reaction time. The saturation magnetization value reaches a maximum of 0.2975 emu g-1 at 300 K when the reaction time is 12 h, indicating that the Curie temperature ( TC ) is higher than 300 K...
April 9, 2018: ACS Applied Materials & Interfaces
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