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Rahul Purbia, Santanu Paria
The noble metal nanocatalysts on high surface area magnetic material supports have huge technological importance in the field of catalysis. The green synthesis of magnetic-noble metal hybrid material has another technological importance. In this study, we report a novel, efficient, and sustainable synthesis methodology for Au nanoparticles (NPs) deposited hierarchical magnetic maghemite (γ-Fe2O3) tubes. In this methodology, the green tea extract was used as a reducing agent for both iron oxide and Au NPs synthesis...
October 7, 2017: Journal of Colloid and Interface Science
Bin Ai, Zengyao Wang, Helmuth Möhwald, Gang Zhang
We show that the growth of Ag nanoparticles (NPs) follows the areas of maximum plasmonic field in nanohole arrays (NAs). We thus obtain Ag NP rings not connected to the metallic rim of the nanoholes. The photocatalytic effect resulting from the enhanced E-field of NAs boosts the reaction and is responsible for the site-selectivity. The strategy, using plasmonics to control a chemical reaction, can be expanded to organic reactions, e.g., synthesis of polypyrrole. After removing the NA film, ordered ring-shaped Ag NPs are easily obtained, inspiring a facile micropatterning method...
October 19, 2017: ACS Nano
Mengmeng Cui, Caroline Miesch, Irem Kosif, Huarong Nie, Paul Kim, Hyunki Kim, Todd Emrick, Thomas P Russell
Nanoparticles (NPs) segregated to the fluid/liquid interface form disordered or liquid-like assemblies that show diffusive motions in the plane of the interface. As the areal density of NPs at the interface increases, the available interfacial area decreases and the interfacial dynamics of the NP assemblies change when the NPs jam. Dynamics associated with jamming was investigated by X-ray photon correlation spectroscopy (XPCS). Water-in-toluene emulsions, formed by a self-emulsification at the liquid-liquid interface and stabilized by ligand-capped CdSe-ZnS NPs, provided a simple, yet powerful platform, to investigate NP dynamics...
October 19, 2017: Nano Letters
Silvia Rossi, Barbara Vigani, Antonella Puccio, Maria Cristina Bonferoni, Giuseppina Sandri, Franca Ferrari
The aim of the present work was the development of chitosan ascorbate nanoparticles (CSA NPs) loaded into a fast-dissolving matrix for the delivery of antibiotic drugs in the treatment of atrophic vaginitis. CSA NPs loaded with amoxicillin trihydrate (AX) were obtained by ionotropic gelation in the presence of pentasodium tripolyphosphate (TPP). Different CSA:TPP and CSA:AX weight ratios were considered and their influence on the particle size, polydispersion index and production yield were investigated. CSA NPs were characterized for mucoadhesive, wound healing and antimicrobial properties...
October 19, 2017: Marine Drugs
Yue-E Miao, Fei Li, Yu Zhou, Feili Lai, Hengyi Lu, Tianxi Liu
Tailoring the size and controlling the morphology of particular nano-architectures are considered as two promising strategies to improve the catalytic performance of metal nanocrystals towards hydrogen evolution reactions (HERs). Herein, mesoporous cobalt phosphide nanotubes (CoP-NTs) with a three-dimensional network structure have been obtained through a facile and efficient electrospinning technique combined with thermal stabilization and phosphorization treatments. The thermal stabilization process has been demonstrated to play a key role in the morphological tailoring of Co3O4 nanotubes (Co3O4-NTs)...
October 19, 2017: Nanoscale
Volodymyr Adamiv, Roman Gamernyk, Ihor Teslyuk
Results of investigations of 98.0Li2B4O7-2.0Ag2O and 97.0Li2B4O7-2.0Ag2O-1.0Gd2O3 glasses with Ag nanoparticles (Ag NPs), formed by thermal treatment in vacuum and in air, are presented. Intensive plasmon absorption bands, connected with Ag NPs, were observed in their optical transmission spectra. It is ascertained that in volumes of both glasses there is formed a small number of Ag NPs, whereas their main mass is concentrated near the surface of samples. The mechanism of Ag NPs formation is proposed. A conclusion is drawn that annealing in vacuum does not necessarily require the presence of reducing ions, whereas formation of nanoparticles at annealing in air is impossible without reducing agents...
June 10, 2017: Applied Optics
Sarah Kadhim Mohsin Al-Hayali, Dunya Zeki Mohammed, Wurood Abdulkhaleq Khaleel, Abdul Hadi Al-Janabi
We report on aluminum oxide nanoparticles (Al2O3 NPs) as a saturable absorber (SA) for passively Q-switched erbium-doped fiber laser (EDFL) operating at a wavelength of 1560.6 nm within the C-band region. A thin film of Al2O3-SA was prepared using polyvinyl alcohol (PVA) as a host polymer. Very stable pulses with a 57.8 KHz repetition rate and 5.6 μs pulse width at a threshold pump power of 158 mW were obtained. A 2.8 μs pulse width, 81 kHz pulse repetition rate, with maximum pulse energy of 56.7 nJ at a diode pump power of 330 mW were recorded...
June 1, 2017: Applied Optics
Ying Xue, James S Goodwin, Deepak Adhikari, Mukaila A Raji, Yong-Fang Kuo
OBJECTIVES: To document the temporal trends in alternative primary care models in which physicians, nurse practitioners (NPs), or physician assistants (PAs) engaged in care provision to the elderly, and examine the role of these models in serving elders with multiple chronic conditions and those residing in rural and health professional shortage areas (HPSAs). DESIGN: Serial cross-sectional analysis of Medicare claims data for years 2008, 2011, and 2014. SETTING: Primary care outpatient setting...
October 1, 2017: Journal of Primary Care & Community Health
Liping Chen, Jiabao Cui, Xia Sheng, Tengfeng Xie, Tao Xu, Xinjian Feng
Semiconductor photoelectrodes that simultaneously possess rapid charge transport and high surface area are highly desirable for efficient charges generation and collection in photoelectrochemical devices. Herein, we report mesostructured ZnO nanowires (NWs) that not only demonstrate a surface area as high as 50.7 m(2)/g, comparable to that of conventional nanoparticles (NPs), but also exhibit a 100 times faster electron transport rate than that in NP films. Moreover, using the comparison between NWs and NPs as an exploratory platform, we show that the synergistic effect between rapid charge transport and high surface area leads to a high perfor-mance photoelectronic formaldehyde sensor that exhibits a detection limit of as low as 5 ppb and a response of 1223% (at 10 ppm), which are, respectively, over 100 times lower and 20 times higher than those of conventional NPs-based device...
October 19, 2017: ACS Sensors
Mehdi Abedini, Farid Shariatmadari, Mohammad Amir Karimi Torshizi, Hamed Ahmadi
The objective of this study was to observe the effects of dietary supplementation with zinc oxide nanoparticles (ZnO-NPs) on performance, egg quality, tissue Zn content, bone parameters, superoxide dismutase activity (SOD), and egg malondialdehyde (MDA) content in laying hens. A total of 288 laying hens at 64 weeks of age were randomly assigned to 4 treatments, 6 replicates, with 12 birds each. Experimental diets included the based diet (without Zn supplementation), and basal diet supplemented with 40, 80, and 120 mg Zn/kg from ZnO-NPs...
October 18, 2017: Biological Trace Element Research
Thi Tuong Vy Phan, Nhat Quang Bui, Madhappan Santha Moorthy, Kang Dae Lee, Junghwan Oh
Multifunctional nano-platform for the combination of photo-based therapy and photoacoustic imaging (PAI) for cancer treatment has recently attracted much attention to nanotechnology development. In this study, we developed iron-platinum nanoparticles (FePt NPs) with the polypyrrole (PPy) coating as novel agents for combined photothermal therapy (PTT) and PAI. The obtained PPy-coated FePt NPs (FePt@PPy NPs) showed excellent biocompatibility, photothermal stability, and high near-infrared (NIR) absorbance for the combination of PTT and PAI...
October 18, 2017: Nanoscale Research Letters
Jinfeng Zhang, Caixia Yang, Rui Zhang, Rui Chen, Zhenyu Zhang, Wenjun Zhang, Shih-Hao Peng, Xiaoyuan Chen, Gang Liu, Chain-Shu Hsu, Chun-Sing Lee
The development of nanotheranostic agents that integrate diagnosis and therapy for effective personalized precision medicine has obtained tremendous attention in the past few decades. In this report, biocompatible electron donor-acceptor conjugated semiconducting polymer nanoparticles (PPor-PEG NPs) with light-harvesting unit is prepared and developed for highly effective photoacoustic imaging guided photothermal therapy. To the best of our knowledge, it is the first time that the concept of light-harvesting unit is exploited for enhancing the photoacoustic signal and photothermal energy conversion in polymer-based theranostic agent...
April 5, 2017: Advanced Functional Materials
Néomie Raassens, Hans Haans
The Net Promoter Score (NPS) is, according to Reichheld, the single most reliable indicator of company growth, and many companies use this recommendation-based technique for measuring customer loyalty. Despite its widespread adoption by many companies across multiple industries, the debate about NPS goes on. A major concern is that managers treat NPS as being equivalent across customers, which is often very misleading. By using a unique data set that combines customers' promoter scores and online word-of-mouth (eWOM) behavior, this research studies how individual customers' promoter scores are related to eWOM, including its relationship with the three categories of customers that are identified by the NPS paradigm (i...
August 2017: J Serv Res
Xinan Wang, Yun Liu, Juan Wang, Yaguang Nie, Shaopeng Chen, Tom K Hei, Zhaoxiang Deng, Lijun Wu, Guoping Zhao, An Xu
Titanium dioxide nanoparticles (TiO2 NPs) have shown great adsorption capacity for arsenic (As); however, the potential impact of TiO2 NPs on the behavior and toxic responses of As remains largely unexplored. In the present study, we focused on the physicochemical interaction between TiO2 NPs and As(III) to clarify the underlying mechanisms involved in their synergistic genotoxic effect on mammalian cells. Our data showed that As(III) mainly interacted with TiO2 NPs by competitively occupying the sites of hydroxyl groups on the surface of TiO2 NP aggregates, resulting in more aggregation of TiO2 NPs...
October 18, 2017: Nanotoxicology
Atsuto Onoda, Ken Takeda, Masakazu Umezawa
Early pregnant employees are potentially and unintendedly exposed to industrial chemicals including nanoparticles. Developmental toxicity of nanoparticle exposure has been concerned because exposure to fine particle including carbon black nanoparticle (CB-NP) during the brain developmental stage enhances the risk of brain disorders. Maternal CB-NP exposure dose-dependently induces astrogliosis, which is an abnormal increase in the reactive astrocytes with glial fibrillary acidic protein (GFAP) and aquaporin-4 overexpression due to the destruction of nearby neurons and blood vessels...
October 19, 2017: Nanotoxicology
Federico Boschi, Francesco De Sanctis
Nanoparticles (NPs) include a wide group of small structures composed by very different materials and characterized by peculiar properties that make them suitable for many applications, especially imaging and drug delivery. In this overview we focus on the optical properties of fluorescent NPs available for in vivo, in vitro and ex vivo preclinical studies and detectable with the optical imaging technique alone or in combination with microscopic confocal imaging. We summarize here the basic principles of the optical detection of fluorescent NPs, elucidate which are the current issues to be resolved and possible solutions to achieve the highest sensitivity and specificity for an unbiased analysis...
August 29, 2017: European Journal of Histochemistry: EJH
Weicheng Zhang, Bangding Xiao, Tao Fang
Silver nanoparticles (Ag NPs) have been inevitably introduced into ecological environment during their extensive applications in daily human life. Thermodynamically, Ag NPs are unstable and transform into other species under various aqueous conditions. Ag NPs and their transformation products pose potential threats to environment and humans. However, the complex environmental conditions and transformations of Ag NPs complicate their human health and environmental risk assessment. To bridge the knowledge gap, four essential environmental transformations, oxidative dissolution, sulfidation, chlorination and photoreduction, of Ag NPs are reviewed herein...
October 3, 2017: Chemosphere
Mary Ersek, Susan E Hickman, Anne C Thomas, Brittany Bernard, Kathleen T Unroe, Suzanne Meeks
Background and Objectives: The need to reduce burdensome and costly hospitalizations of frail nursing home residents is well documented. The Optimizing Patient Transfers, Impacting Medical Quality, and Improving Symptoms: Transforming Institutional Care (OPTIMISTIC) project achieved this reduction through a multicomponent collaborative care model. We conducted an implementation-focused project evaluation to describe stakeholders' perspectives on (a) the most and least effective components of the intervention; (b) barriers to implementation; and (c) program features that promoted its adoption...
October 17, 2017: Gerontologist
Nathalie Allibe, Camille Richeval, Mélodie Phanithavong, Amandine Faure, Delphine Allorge, François Paysant, Françoise Stanke-Labesque, Hélène Eysseric-Guerin, Jean-Michel Gaulier
New psychoactive substances (NPS) use has rapidly increased over the last decade, and in the last 4 years producers increasingly appear to be targeting non-controlled synthetic opioids, involving fentanyl derivatives such as ocfentanil (OcF). Identification of metabolites is of major importance in the context of NPS use as it could improve detection window in biological matrices in clinical and forensic intoxication cases. Hence, this work aims to report a fatality involving OcF documented by the identification of metabolites...
October 16, 2017: Drug Testing and Analysis
Lan Yuan, Bo Weng, Juan Carlos Colmenares, Yugang Sun, Yi-Jun Xu
Promising semiconductor-based photocatalysis toward achieving efficient solar-to-chemical energy conversion is an ideal strategy in response to the growing worldwide energy crisis, which however is often practically limited by the insufficient photoinduced charge-carrier separation. Here, a rational cascade engineering of Au nanoparticles (NPs) decorated 2D/2D Bi2 WO6 -TiO2 (B-T) binanosheets to foster the photocatalytic efficiency through the manipulated flow of multichannel-enhanced charge-carrier separation and transfer is reported...
October 17, 2017: Small
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