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metal nanoparticle

Danqing Wang, Weijia Wang, Michael P Knudson, George C Schatz, Teri W Odom
This review focuses on structural engineering of lasers from the macroscale to the nanoscale, with an emphasis on plasmon nanolasers. Conventional lasers based on Fabry-Pérot cavities are limited in device size. In contrast, plasmon nanolasers can overcome the diffraction limit of light and incorporate unique structural designs to engineer cavity geometries and optical band structure. Since the spaser concept was introduced in 2003, tremendous progress in nanolasing has been made on architectures that exploit metal films and nanoparticles...
October 17, 2017: Chemical Reviews
Cheng Peng, Chensi Shen, Siyuan Zheng, Weiling Yang, Hang Hu, Jianshe Liu, Jiyan Shi
Many studies have shown the effect of solution chemistry on the environmental behavior of metal-based nanoparticles (NPs), except CuO NPs. Here, we investigated the agglomeration, sedimentation, dissolution, and speciation of CuO NPs by varying pH, ionic strength, ionic valence, and natural organic matter (NOM). The results showed that as the pH moved away from 6, the size of CuO agglomerates decreased, along with the enhanced NP suspension stabilization, due to the increase of electrostatic repulsive force...
October 14, 2017: Nanomaterials
Natalia Sizochenko, Danuta Leszczynska, Jerzy Leszczynski
The quantitative relationships between the activity of zebrafish ZHE1 enzyme and a series of experimental and physicochemical features of 24 metal oxide nanoparticles were revealed. Vital characteristics of the nanoparticles' structure were reflected using both experimental and theoretical descriptors. The developed quantitative structure-activity relationship model for nanoparticles (nano-QSAR) was capable of predicting the enzyme inactivation based on four descriptors: the hydrodynamic radius, mass density, the Wigner-Seitz radius, and the covalent index...
October 16, 2017: Nanomaterials
Jorge Espina-Casado, Alfonso Fernández-González, Ángel José Del Reguero-Huerga, Humberto Rodríguez-Solla, Marta Elena Díaz-García, Rosana Badía Laíño
One of the main drawbacks in the application of metal oxide nanoparticles as lubricant additives is their poor stability in organic media, despite the good anti-wear, friction-reducing and high load capacity properties described for these materials. In this work, we present a novel procedure to chemically cap the surface of ZrO2 nanoparticles (ZrO2NPs) with long hydrocarbon chains in order to obtain stable dispersions of ZrO2NPs in non-aqueous media without disrupting their attributes as lubricant additives...
October 16, 2017: Nanotechnology
Bin Quan, Xiaohui Liang, Guangbin Ji, Yanan Zhang, Guoyue Xu, Youwei Du
The magnet/dielectric composites with tunable structure and composition have drawn much attention because of their particular merits in magnetoelectric properties compared with the sole dielectric or magnetic composites. In addition, porous materials at the nanoscale can satisfy the growing requirements in many industries. Therefore, constructing porous metal alloy/carbon nanocomposites is to be an admirable option. Unfortunately, traditional synthesis methods involve multi-step routes and complicated insert-and-remove templates approaches...
October 16, 2017: ACS Applied Materials & Interfaces
Li Gong, Jie-Jie Chen, Yang Mu
Converting CO2 into valuable chemicals and fuels is one of the most practical routes for reducing CO2 emissions while fossil fuels continue to dominate the energy sector. Noble-metal-free NiFe bimetal nanoparticles have shown good catalytic activity in CO2 conversion. Herein we theoretically evaluated the catalytic performance and possible mechanisms of NiFe-based nanoclusters for hydrogenating CO2 to form formic acid and CO through bicarbonate by using a periodic and self-consistent density functional theory (DFT) simulation...
October 16, 2017: Physical Chemistry Chemical Physics: PCCP
Bin Qi, Chenchen Wu, Ling Xu, Wenjing Wang, Jin Cao, Jun Liu, Shuai Zhang, Detlef Gabel, Haibo Zhang, Xiaohai Zhou
A fundamental boron cluster, [closo-B12H12](2-), mainly known as an inert agent for boron neutron capture therapy, can also serve as a bi-functional reductant and a capping agent for the formation of monodispersed size-controlled gold nanoparticles (AuNPs) under mild reaction conditions. The obtained AuNPs remained thermo-dynamically stable over 3 months, and exhibited high performance in phase transfer and sensing of heavy metal ions.
October 16, 2017: Chemical Communications: Chem Comm
Aftab Aslam Parwaz Khan, Anish Khan, Abdullah M Asiri, Basma Galeb Alhogbia, Ghulam Md Ashraf
Recently the decoration of graphene with metallic nanoparticles by a synchronized reduction of graphene oxide (GO) and synthesis of metallic nanoparticles has gained energy. Metal-decorated carbon substrates, for example, carbon nanotubes and graphene oxide have been of mind boggling excitement to the scientific group all through the past three decades on account of different potential applications.The utilization of graphene oxide as the nano scale substrates for the formation of nanocomposites with metal oxides is a novel thought to acquire a hybrid which would show both the properties of GO as an interesting paper-shape material and the elements of single nano-sized metal particles...
October 16, 2017: Current Drug Metabolism
Kirtiman Deo Malviya, Chandan Srivastava, Kamanio Chattopadhyay
The present work reports the nature of the evolution of an array of nanoparticles during the synthesis of alloy nanoparticles of Ag-60 at%Cu by the co-reduction of metal salt precursors using NaBH4 in an aqueous medium. This was achieved by studying samples extracted at different intervals of time from the reaction bath. The microstructural characterization reveals that at the initial stage of synthesis, a single-phase solid solution of alloy nanoparticles of very small sizes was formed; however, as the reaction time increases, a network of chains of nanoparticles evolves containing particles rich in either Ag or Cu...
October 16, 2017: Physical Chemistry Chemical Physics: PCCP
Jie J Yao, Eric A Lewallen, William H Trousdale, Wei Xu, Roman Thaler, Christopher G Salib, Nicolas Reina, Matthew P Abdel, David G Lewallen, Andre J van Wijnen
We evaluated recently published articles relevant to the biological effects of titanium dioxide (TiO2) particles on local endogenous cells required for normal bone homeostasis, repair, and implant osseointegration. Structural characteristics, size, stability, and agglomeration of TiO2 particles alter the viability and behavior of multiple bone-related cell types. Resulting shifts in bone homeostasis may increase bone resorption and lead to clinical incidents of osteolysis, implant loosening, and joint pain...
2017: BioResearch Open Access
Huiyu Yuan, Kai Han, David Dubbink, Guido Mul, Johan E Ten Elshof
The nature of the external crystal facets is critical to control the (photo)catalytic properties. Two-dimensional materials can expose only one type of crystal facet among zero-dimensional (0D), one-dimensional (1D), and two-dimensional (2D) materials. Controllable tuning of the nature of the external crystal facets of 2D materials is highly desirable but very challenging. Here, we show that 2D particles with the desirable crystal facet for high-performance photocatalytic H2 generation can be obtained by using 2D metal oxide materials (i...
October 6, 2017: ACS Catalysis
Yi Shi, Yue Zhou, Dong-Rui Yang, Wei-Xuan Xu, Chen Wang, Feng-Bin Wang, Jing-Juan Xu, Xing-Hua Xia, Hong-Yuan Chen
Water splitting devices for hydrogen generation through electrolysis (hydrogen evolution reaction, HER) hold great promise for clean energy. However, their practical application relies on the development of inexpensive and efficient catalysts to replace precious platinum catalysts. We previously reported that HER can be largely enhanced through finely tuning the energy level of molybdenum sulfide (MoS2) by hot electron injection from plasmonic gold nanoparticles. Under this inspiration, herein, we propose a strategy to improve the HER performance of MoS2 by engineering its energy level via direct transition-metal doping...
October 15, 2017: Journal of the American Chemical Society
Nan Hao, Rong Hua, Saibo Chen, Ying Zhang, Zhou Zhou, Jing Qian, Qian Liu, Kun Wang
In this study, Ag/TiO2/3D nitrogen doped graphene hydrogel (3DNGH) was prepared for the first time and the photocurrent intensity of this material was greatly enhanced, which was attributed to the multiple enhancements accomplished in one step. The porous structure of 3DNGH could provide an exceptionally large accessible surface area, which was beneficial for the anchoring of Ag and TiO2 nanoparticles. The introduction of nitrogen doped graphene and metal nanoparticles was capable to facilitate the charge separation efficiency and accelerate the transfer rate of the photogenerated electron-hole pairs...
October 8, 2017: Biosensors & Bioelectronics
Mohankandhasamy Ramasamy, Jin-Hyung Lee, Jintae Lee
The objective of the present study was to develop a one-pot strategy to synthesis gold nanoparticle complexes using cinnamaldehyde, a potent antibiofilm agent which in its free form, exhibits high volatility and unstable nature. Hence, we developed cinnamaldehyde gold nanoparticles (CGNPs) in a single step to overcome the limitations of free cinnamaldehyde. Furthermore, reduction abilities of cinnamaldehyde under different experimental conditions, that is, varying precursor concentrations of cinnamaldehyde and gold, metal salts, pH, temperature, and light sources, were investigated...
October 6, 2017: Colloids and Surfaces. B, Biointerfaces
Elham Gharibshahi, Elias Saion, Ahmadreza Ashraf, Leila Gharibshahi
Gamma radiolytic synthesis was used to produce size-controlled spherical platinum nanoparticles from an aqueous solution containing platinum tetraammine and polyvinyl pyrrolidone. The structural characterizations were performed using X-ray diffraction, and transmission electron microscopy. The transmission electron microscopy was used to determine the average particle diameter, which decreased from 4.4nm at 80kGy to 2.8nm at 120kGy. The UV-visible absorption spectrum was measured and found that platinum nanoparticles exhibit two steady absorption maxima in UV regions due to plasmonic excitation of conduction electrons, which blue shifted to lower wavelengths with a decrease in particle size...
September 9, 2017: Applied Radiation and Isotopes
Li-Chen Lee, Xiaoyu Xing, Yan Zhao
The extraordinary catalytic properties of enzymes are derived not only from their catalytic groups but also the unique properties of the active site. Tuning the microenvironment of synthetic catalysts is expected to enhance their performance if effective strategies can be developed. Interfacially cross-linked reverse micelles were prepared from three different cross-linkable surfactants. Pd nanoparticles were deposited in the core of the micelle for the catalytic hydrogenation of bicarbonate and CO2. The catalytic performance was found to depend heavily on the nature of the headgroup of the surfactant...
October 13, 2017: ACS Applied Materials & Interfaces
Jaewook Lee, Kenshin Takemura, Enoch Y Park
Plasmonic nanomaterials (P-NM) are receiving attention due to their excellent properties, which include surface-enhanced Raman scattering (SERS), localized surface plasmon resonance (LSPR) effects, plasmonic resonance energy transfer (PRET), and magneto optical (MO) effects. To obtain such plasmonic properties, many nanomaterials have been developed, including metal nanoparticles (MNP), bimetallic nanoparticles (bMNP), MNP-decorated carbon nanotubes, (MNP-CNT), and MNP-modified graphene (MNP-GRP). These P-NMs may eventually be applied to optical biosensing systems due to their unique properties...
October 13, 2017: Sensors
Li Li Yang, Guorui Liu, Minghui Zheng, Rong Jin, Yuyang Zhao, Xiaolin Wu, Yang Xu
Environmentally persistent free radicals (EPFRs) are emerging pollutants that can adversely affect human health. Although the pivotal roles of metal oxides in EPFR formation have been identified, few studies have investigated the influence of the metal oxide species, size, or concentration on the formation of EPFRs. In this study, EPFR formation from a polyaromatic hydrocarbon with chlorine and hydroxyl substituents (2,4-dichloro-1-naphthol) was investigated using electron paramagnetic resonance spectroscopy...
October 13, 2017: Environmental Science & Technology
Bing-Jian Yao, Luo-Gang Ding, Fei Li, Jiang-Tao Li, Qi-Juan Fu, Yujie Ban, Ang Guo, Yu-Bin Dong
CO2 capture and transformation are of great importance to make cuts in greenhouse gas emissions. Nano metal-organic frameworks (NMOFs) could serve as the ideal fillers for polymer-membranes owing to their structural diversity and regulable micro-environment of the nanocage. Herein, a bifunctional robust and chemically cross-linked NMOF-based membrane was successfully constructed by the post-synthetic polymerization of imidazolium-based ionic liquid decorated UiO-66 type nanoparticles (NPs) and isocyanate-terminated polyurethane oligomer under mild condition...
October 13, 2017: ACS Applied Materials & Interfaces
Naoko Okibe, Daisuke Nakayama, Takahiro Matsumoto
The acidophilic, Fe(III)-reducing heterotrophic bacteria Acidocella aromatica PFBC(T) and Acidiphilium cryptum SJH were utilized to produce palladium (Pd) bionanoparticles via a simple 1-step microbiological reaction. Monosaccharide (or intracellular NADH)-dependent reactions lead to visualization of intra/extra-cellular enzymatic Pd(0) nucleation. Formic acid-dependent reactions proceeded via the first slow Pd(0) nucleation phase and the following autocatalytic Pd(II) reduction phase regardless of the presence or viability of the cells...
October 12, 2017: Extremophiles: Life Under Extreme Conditions
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