85,248 results match your criteria Nano Today [Journal]


Workplace Exposure to Nanoparticles during Thermal Spraying of Ceramic Coatings.

Ann Work Expo Health 2018 Dec 14. Epub 2018 Dec 14.

Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Barcelona, Spain.

Thermal spraying is widely used for industrial-scale application of ceramic coatings onto metallic surfaces. The particular process has implications for occupational health, as the high energy process generates high emissions of metal-bearing nanoparticles. Emissions and their impact on exposure were characterized during thermal spraying in a work environment, by monitoring size-resolved number and mass concentrations, lung-deposited surface area, particle morphology, and chemical composition. Read More

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December 2018

Coupling interaction between porous biochar and nano zero valent iron/nano α-hydroxyl iron oxide improves the remediation efficiency of cadmium in aqueous solution.

Chemosphere 2018 Dec 7;219:493-503. Epub 2018 Dec 7.

College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China. Electronic address:

Based on the interaction between mesoscopic biochar materials and nanomaterials, the synergistic mechanism of the two materials in the process of cadmium remediation was studied. KCO activated porous biochar (KBC) loaded with nano-zero-valent iron (nZVI)/nano-α-hydroxy-iron oxide (nHIO) was studied. Macroscopically, batch adsorption experiments were carried out to describe the adsorption properties of the composites. Read More

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December 2018

Self-faceting of emulsion droplets as a route to solid icosahedra and other polyhedra.

J Colloid Interface Sci 2018 Dec 2;538:541-545. Epub 2018 Dec 2.

Department of Physics, Bar-Ilan University, Ramat-Gan 5290002, Israel; Bar-Ilan Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel. Electronic address:

Hypothesis: Temperature-controlled self-faceting of liquid droplets has been recently discovered in surfactant-stabilized alkane-in-water emulsions. We hypothesize that similar self-faceting may occur in emulsion droplets of UV-polymerizable linear hydrocarbons. We further hypothesize that the faceted droplet shapes can be fixed by UV-initiated polymerization, thus providing a new route towards the production of solid polyhedra. Read More

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December 2018

Synthesis of a new disulfide Fmoc monomer for creating biologically susceptible linkages in peptide nucleic acid oligomers.

Bioorg Chem 2018 Dec 1;84:394-398. Epub 2018 Dec 1.

Department of Chemistry and Biochemistry, Georgia Southern University, Savannah, GA, USA. Electronic address:

Peptide nucleic acids (PNA) are one of many synthetic mimics of DNA and RNA that have found applications as biological probes, as nano-scaffold components, and in diagnostics. In an effort to use PNA as constructs for cellular delivery we investigated the possibility of installing a biologically susceptible disulfide bond in the backbone of a PNA oligomer. Here we report the synthesis of a new abasic Fmoc monomer containing a disulfide bond that can be incorporated into a PNA oligomer (DS-PNA) using standard solid phase peptide synthesis. Read More

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December 2018

Impact of selenium nano-particles in semen extender on bull sperm quality after cryopreservation.

Theriogenology 2018 Dec 5;126:121-127. Epub 2018 Dec 5.

Animal Production Research Institute, Dokki, Giza, Egypt.

The aim of this study was to evaluate the effect of adding different concentrations of selenium nano-particles (Se-NPs) in semen extender on bull sperm cryopreservation. Five healthy, fertile Friesian bulls were used, and the ejaculates were obtained using an artificial vagina. Semen of all bulls were pooled and diluted in a tris-yolk fructose (TYF) extender supplemented with Se-NPs at concentrations of 0 (T1, control), 0. Read More

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December 2018

Antibiotic elution and mechanical property of TiO nanotubes functionalized PMMA-based bone cements.

J Mech Behav Biomed Mater 2018 Nov 23;91:91-98. Epub 2018 Nov 23.

Institute of Chemical and Engineering Sciences, A⁎STAR (Agency for Science, Technology and Research), 1 Pesek Road, Singapore 627833, Jurong Island, Singapore; Department of Chemical and Biomolecular Engineering, The National University of Singapore, 4 Engineering Drive 4, Singapore 117576, Singapore. Electronic address:

To overcome the disadvantage of current antibiotic bone cements with low drug elution efficiency, the hollow nanostructured titanium-dioxide (TiO) nanotubes (TNTs) were formulated with antibiotic loaded bone cement to create nano diffusion networks, enabling enhanced release of antibiotic. By incorporation of TNTs into Poly(methyl methacrylate) (PMMA) based bone cement, more than 50% of loaded antibiotic (such as gentamicin or vancomycin) could be released in two months. As comparison, only about 5% of total drug release was achieved in the absence of TNTs. Read More

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November 2018

Carrier-free nanoparticles of cathepsin B-cleavable peptide-conjugated doxorubicin prodrug for cancer targeting therapy.

J Control Release 2018 Dec 11. Epub 2018 Dec 11.

Biomedical Research Institute, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea; KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 02841, Republic of Korea. Electronic address:

Cancer nanomedicine using nanoparticle-based delivery systems has shown outstanding promise in recent decades for improving anticancer treatment. However, limited targeting efficiency, low drug loading efficiency and innate toxicity of nanoparticles have caused severe problems, leaving only a few available in the clinic. Here, we newly developed carrier-free nanoparticles of cathepsin B-cleavable peptide (Phe-Arg-Arg-Gly; FRRG)-conjugated doxorubicin (DOX) prodrug (FRRG-DOX) that formed a stable nanoparticle structure with an average diameter of 213 nm in aqueous condition. Read More

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December 2018

Hyperbolic phonon polaritons in suspended hexagonal boron nitride.

Nano Lett 2018 Dec 14. Epub 2018 Dec 14.

Highly-confined and low-loss hyperbolic phonon polaritons in hexagonal boron nitride possess properties analogous to surface plasmon polaritons, but with enhanced confinement and lower loss. Their properties have been so far mostly studied on dielectric substrates, which provide an asymmetric environment for polariton propagation, and add to damping. In this work, we investigate hyperbolic phonon polaritons over suspended hexagonal boron nitride, showing remarkable properties, including elongated polariton wavelength and reduced damping, up to 18% lower compared to dielectric-backed samples. Read More

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December 2018

Antimony Nanorod Encapsulated in Cross-linked Carbon for High-Performance Sodium Ion Battery Anodes.

Nano Lett 2018 Dec 14. Epub 2018 Dec 14.

Antimony (Sb) based materials have been considered as one of promising anodes for sodium ion batteries (SIBs) owing to their high theoretical capacities and appropriate sodium inserting potentials. So far, the reported energy density and cycling stability of the Sb based anodes for SIBs are quite limited and need to be significantly improved. Here, we develop a novel Sb/C hybrid encapsulating the Sb nanorods into highly conductive N & S co-doped carbon (Sb@(N, S-C)) frameworks. Read More

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December 2018

Ultra-High Evaporative Heat Fluxes in Nano-Confined Geometries.

Langmuir 2018 Dec 14. Epub 2018 Dec 14.

Advancement in high-performance photonics/electronics devices has amplified generated thermal energy making thermal management a bottleneck for the accelerated innovation in these disciplines. While various methods have been used to tackle the thermal management problem, evaporation with nanometer fluid thickness is one of the most promising approaches for future technological demands. Here, we studied thin-film evaporation in nanochannels under absolute negative pressure in both transient and steady-state conditions. Read More

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December 2018

Adsorption Structure of Mono- and Diradicals on a Cu(111) Surface: Chemoselective Dehalogenation of 4-Bromo-3''-iodo- p-terphenyl.

ACS Nano 2018 Dec 14. Epub 2018 Dec 14.

Selectivity is a key parameter for building customized organic nanostructures via bottom-up approaches. Therefore, strategies are needed, which allow connecting molecular entities at a specific stage of the assembly process in a chemoselective manner. Studying the mechanisms of such reactions is the key to apply these transformations for the build-up of organic nanostructures on surfaces. Read More

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December 2018

Modular Nanoparticulate Prodrug Design Enables Efficient Treatment of Solid Tumors Using Bioorthogonal Activation.

ACS Nano 2018 Dec 14. Epub 2018 Dec 14.

Center for Systems Biology , Massachusetts General Hospital , Boston , Massachusetts 02114 , United States.

Prodrug strategies that facilitate localized and controlled activity of small-molecule therapeutics can reduce systemic exposure and improve pharmacokinetics, yet limitations in activation chemistry have made it difficult to assign tunable multifunctionality to prodrugs. Here, we present the design and application of a modular small-molecule caging strategy that couples bioorthogonal cleavage with a self-immolative linker and an aliphatic anchor. This strategy leverages recently discovered in vivo catalysis by a nanoencapsulated palladium compound (Pd-NP), which mediates alloxylcarbamate cleavage and triggers release of the activated drug. Read More

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December 2018

Diabetes-free survival after extended distal pancreatectomy and islet auto transplantation for benign or borderline/malignant lesions of the pancreas.

Am J Transplant 2018 Dec 14. Epub 2018 Dec 14.

Diabetes Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy.

Islet autotransplantation is particularly attractive to prevent diabetes after extended pancreatectomy for benign or borderline/malignant pancreas disease. Between 2008 and 2018, 25 patients underwent left extended pancreatectomy (>60%) and islet autotransplantation for neoplasm located in the pancreatic neck or proximal body. Overall, disease-free and diabetes-free survivals were estimated and compared with those observed in 68 non diabetic patients who underwent distal pancreatectomy for pancreatic neoplasms without islet autotransplantation. Read More

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December 2018

Characterization of peristaltic motility in the striated muscle portion of the esophagus using a novel in vivo method in rats.

Neurogastroenterol Motil 2018 Dec 14:e13518. Epub 2018 Dec 14.

Laboratory of Physiology, Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University, Gifu, Japan.

Background: Esophageal peristalsis is controlled by the brainstem via vago-vagal reflex. However, the precise regulatory mechanisms in the striated muscle portion are largely unknown. The aim of this study was to characterize peristaltic motility in the portion of the esophagus using a novel in vivo method in rats. Read More

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December 2018

Confinement of Perovskite-QDs within a Single MOF Crystal for Significantly Enhanced Multiphoton Excited Luminescence.

Adv Mater 2018 Dec 14:e1806897. Epub 2018 Dec 14.

State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.

The development of the photostable higher-order multiphoton-excited (MPE) upconversion single microcrystalline material is fundamentally and technologically important, but very challenging. Here, up to five-photon excited luminescence in a host-guest metal-organic framework (MOF) and perovskite quantum dot (QD) hybrid single crystal ZJU-28⊃MAPbBr is shown via an in situ growth approach. Such a MOF strategy not only results in a high QD loading concentration, but also significantly diminishes the aggregation-caused quenching (ACQ) effect, provides effective surface passivation, and greatly reduces the contact of the QDs with the external bad atmosphere due to the confinement effect and protection of the framework. Read More

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December 2018

Revisiting the Optimal Nano-Morphology: Towards Amorphous Organic Photovoltaics.

Chem Rec 2018 Dec 13. Epub 2018 Dec 13.

Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, ON, Canada, K7K 7B4.

Organic photovoltaic cells commonly use an active layer with a polycrystalline bulk heterojunction. However, for simplifying the fabrication process, it may be worthwhile to use an amorphous active layer to lessen the burden on processing to achieve optimal performance. While polymers can adopt amorphous phases, molecular glasses, small molecules that can readily form glassy phases and do not crystallize over time, offer an appealing alternative, being monodisperse species. Read More

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December 2018

High-Performance Photoinduced Memory with Ultrafast Charge Transfer Based on MoS /SWCNTs Network Van Der Waals Heterostructure.

Small 2018 Dec 13:e1804661. Epub 2018 Dec 13.

State Key Laboratory for Chemo/Biosensing and Chemometrics, School of Physics and Technology, Wuhan University, Wuhan, 430072, China.

Photoinduced memory devices with fast program/erase operations are crucial for modern communication technology, especially for high-throughput data storage and transfer. Although some photoinduced memories based on 2D materials have already demonstrated desirable performance, the program/erase speed is still limited to hundreds of micro-seconds. A high-speed photoinduced memory based on MoS /single-walled carbon nanotubes (SWCNTs) network mixed-dimensional van der Waals heterostructure is demonstrated here. Read More

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December 2018

Extracellular Surface Potential Mapping by Scanning Ion Conductance Microscopy Revealed Transient Transmembrane Pore Formation Induced by Conjugated Polymer Nanoparticles.

Macromol Biosci 2018 Dec 13:e1800271. Epub 2018 Dec 13.

Department of Physics, Biomolecular Sciences Institute, Florida International University, FL, 33199, USA.

In-depth understanding of the biophysicochemical interactions at the nano-bio interface is important for basic cell biology and applications in nanomedicine and nanobiosensors. Here, the extracellular surface potential and topography changes of live cell membranes interacting with polymeric nanomaterials using a scanning ion conductance microscopy-based potential imaging technique are investigated. Two structurally similar amphiphilic conjugated polymer nanoparticles (CPNs) containing different functional groups (i. Read More

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December 2018

The Semiconductor/Conductor Interface Piezoresistive Effect in an Organic Transistor for Highly Sensitive Pressure Sensors.

Adv Mater 2018 Dec 13:e1805630. Epub 2018 Dec 13.

Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Sciences, Tianjin University, Tianjin, 300072, China.

The piezoresistive pressure sensor, a kind of widely investigated artificial device to transfer force stimuli to electrical signals, generally consists of one or more kinds of conducting materials. Here, a highly sensitive pressure sensor based on the semiconductor/conductor interface piezoresistive effect is successfully demonstrated by using organic transistor geometry. Because of the efficient combination of the piezoresistive effect and field-effect modulation in a single sensor, this pressure sensor shows excellent performance, such as high sensitivity (514 kPa ), low limit of detection, short response and recovery time, and robust stability. Read More

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December 2018

Hierarchical Nanotubes Constructed by Co S /MoS Ultrathin Nanosheets Wrapped with Reduced Graphene Oxide for Advanced Lithium Storage.

Chem Asian J 2018 Dec 10. Epub 2018 Dec 10.

Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123, P. R. China.

Nanostructured hybrid metal sulfides have attracted intensive attention due to their fascinating properties that are unattainable by the single-phased counterpart. Herein, we report an efficient approach to construct cobalt sulfide/molybdenum disulfide (Co S /MoS ) wrapped with reduced graphene oxide (rGO). The unique structures constructed by ultrathin nanosheets and synergetic effects benefitting from bimetallic sulfides provide improved lithium ions reaction kinetics, and they retain good structural integrity. Read More

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December 2018

Constructing SrTiO₃-TiO₂ Heterogeneous Hollow Multi-shelled Structures for Enhanced Solar Water Splitting.

Angew Chem Int Ed Engl 2018 Dec 10. Epub 2018 Dec 10.

Institute of Process Engineering, Chinese Academy of Sciences, No. 1 Beiertiao, Zhongguancun, Haidian District, CHINA.

Constructing hollow multi-shelled structures (HoMSs) demonstrates significant effect on promoting light absorption property of catalysts and enhancing their performance in solar energy conversion applications. Perovskite SrTiO₃ photocatalyst exhibits giant potential in photocatalytic applications, but difficulties in controlling its morphology structure restrict the further enhancement in its light harvesting ability. Herein, we introduce a facile hydrothermal method to design the SrTiO₃-TiO₂ heterogeneous HoMSs by a hydrothermal crystallization of SrTiO₃ on the surface of the TiO₂ HoMSs, which will realize a full coverage of SrTiO₃ on the TiO₂ surface and construct the high-quality interface of SrTiO₃/TiO₂. Read More

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December 2018

Preparation and characterization of bosentan monohydrate/ε-polycaprolactone nanoparticles obtained by electrospraying.

Biotechnol Prog 2018 Dec 8. Epub 2018 Dec 8.

Instituto de Investigaciones en Ciencias Químicas. Facultad de Ciencias Químicas y Tecnológicas, Universidad Católica de Cuyo, San Juan, Argentina.

The electrospraying technique provides nano and microparticles that can be used as drug delivery systems. The aims of this study were, firstly, to optimize the influent parameters of electrospraying for the manufacture of a Bosentan (BOS) nanoparticulate platform, and secondly, to evaluate its physicochemical properties and in vitro biopharmaceutical behavior. Particles were characterized by scanning electron microscopy (SEM), powder X-ray diffraction (PXRD), differential scanning calorimetry (DSC), thermogravimetry (TG) and Fourier transformed Infrared spectroscopy (FTIR). Read More

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December 2018

3D Gold-Modified Cerium and Cobalt Oxide Catalyst on a Graphene Aerogel for Highly Efficient Catalytic Formaldehyde Oxidation.

Small 2018 Dec 7:e1804415. Epub 2018 Dec 7.

Collaborative Innovation Center of Suzhou Nano Science and Technology, College of Chemistry, Chemical Engineering and Materials ScienceSoochow University, 199 Ren'ai Road, Suzhou, 215123, P.R. China.

A hard template method is used to prepare porous gold-doped cerium and cobalt oxide (Au-Ce Co ) materials. A series of 3D Au-Ce Co /graphene aerogel (GA) composites is then fabricated by a facile heating method. The obtained catalysts possess a well-defined structure of ordered arrays of nanotubes and good performance in formaldehyde (HCHO) oxidation. Read More

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December 2018

Micro-lensed optical fibers for a surface-enhanced Raman scattering sensing probe.

Opt Lett 2018 Dec;43(24):6029-6032

We present the fabrication and characterization of a novel sensing configuration based on surface-enhanced Raman scattering (SERS) and two micro-lensed optical fibers. The first micro-lensed fiber is used to excite surface plasmon resonance in a gold film deposited over a mono-layer of nano-sphere surface (AuFON), and the second lensed fiber is used to collect the SERS signal. The sensing capabilities of the fabricated device are demonstrated by measuring different concentrations of Rhodamine 6G in a water solution. Read More

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December 2018

Orbital Selectivity Enhanced by Nematic Order in FeSe.

Phys Rev Lett 2018 Nov;121(22):227003

Department of Physics & Astronomy, Rice University, Houston, Texas 77005, USA.

Motivated by the recent low-temperature experiments on bulk FeSe, we study the electron correlation effects in a multiorbital model for this compound in the nematic phase using the U(1) slave-spin theory. We find that a finite nematic order helps to stabilize an orbital selective Mott phase. Moreover, we propose that when the d- and s-wave bond nematic orders are combined with the ferro-orbital order, there exists a surprisingly large orbital selectivity between the xz and yz orbitals even though the associated band splitting is relatively small. Read More

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November 2018

Three-Dimensional Decoupling Co-Catalyst from a Photoabsorbing Semiconductor as a New Strategy To Boost Photoelectrochemical Water Splitting.

Nano Lett 2018 Dec 14. Epub 2018 Dec 14.

Guangdong Key Lab of Nano-Micro Material Research, School of Chemical Biology and Biotechnology , Peking University Shenzhen Graduate School , Shenzhen 518055 , China.

A cocatalyst is normally deposited on a photoabsorbing semiconductor (PAS) for photoelectrochemical (PEC) water splitting, but with drawbacks of limited loading, reduced light absorption, and tendency of charge recombination. To tackle these problems, a scheme of three-dimensional (3D) decoupling cocatalysts from the PAS with a pore-spanning crisscross conducting polymer host is proposed in this work. To demonstrate the concept, a facile method was developed for the in situ cogrowth of FeO nanoparticles and conducting polymer (CP) network in various PAS with different microstructures such as a TiO nanorod array, WO nanosheet array, and planar TiO nanoparticle film, generating the bespoke photoanodes. Read More

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December 2018

Nano-Assemblies from J-Aggregated Dyes: A Stimuli-Responsive Tool Applicable to Living Systems.

J Am Chem Soc 2018 Dec 14. Epub 2018 Dec 14.

Controlling the packing arrangements of dyes is a facile way of tuning their photophysical and/or photochemical properties, thus enabling new sensing mechanisms for photofunctional tools. Here, we present a general and robust strategy toward wa-ter-stable J-aggregated dye templated nano-assemblies by incorporating an amphiphilic diblock copolymer and a stimuli-responsive dye as the only two building components. An iodo-substituted boron dipyrromethene (BODIPY) was adopted as a template to direct the self-assembly of poly(ethylene glycol)-block-polycaprolactone (PEG-PCL), forming a core-shell nanoplate with slip-stacked BODIPYs as core surrounded by hydrophilic PEG shell. Read More

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December 2018

From CsPbBr Nano-Inks to Sintered CsPbBr-CsPbBr Films via Thermal Annealing: Implications on Optoelectronic Properties.

J Phys Chem C Nanomater Interfaces 2017 Jun 3;121(21):11956-11961. Epub 2017 May 3.

Nanochemistry Department and Materials Characterization Facility, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.

CsPbBr nanocrystals passivated with short molecular ligands and deposited on a substrate were annealed from room temperature to 400 °C in inert atmosphere. Chemical, structural, and morphological transformations were monitored and by different techniques, while optoelectronic properties of the film were also assessed. Annealing at 100 °C resulted in a 1 order of magnitude increase in photocurrent and photoresponse as a result of partial sintering of the NCs and residual solvent evaporation. Read More

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The Overview of Methods of Nanoparticle Exposure Assessment.

Methods Mol Biol 2019 ;1894:353-367

Key Laboratory of Occupational Safety and Health, Beijing Municipal Institute of Labour Protection, Beijing, People's Republic of China.

Nanotechnology is now widely used in industry as well as consumer products, such as electrical devices, cosmetics, medicine, and household appliances. In the life cycle of the nano-products, including production, use, and disposal, nanoparticles may be released to the environment. However, there is no current consensus on the best method for evaluating and characterizing nanoparticle exposure. Read More

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January 2019
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Nanotoxicity Assessment Using Embryonic Zebrafish.

Methods Mol Biol 2019 ;1894:331-343

Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, NY, USA.

The emergence of nanomaterials in industrial processing and consumer products has generated an increased presence of nano-enabled products in the environment and now pose an increased risk of exposure to living organisms. However, assessing the risks of nanomaterials is a challenging task because of a large variety and great variability in their properties. Here, we describe a methodology for assessing toxicity and evaluate potential risks posed by nanomaterials using zebrafish embryos as a model organism. Read More

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January 2019

Application of Electron Microscopes in Nanotoxicity Assessment.

Methods Mol Biol 2019 ;1894:247-269

Department of Anatomical Sciences and Neurobiology, University of Louisville, Louisville, KY, USA.

In this chapter, we highlight the applications of electron microscopes (EMs) in nanotoxicity assessment. EMs can provide detailed information about the size and morphology of nanomaterials (NMs), their localization in cells and tissues, the nano-bio interactions, as well as the ultrastructural changes induced by NMs exposure. Here, we share with the readers how we prepare the tissue sample, and the different types of EMs used among the nanotoxicologists. Read More

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January 2019

Measurement of Nanoparticle-Induced Mitochondrial Membrane Potential Alterations.

Authors:
Salik Hussain

Methods Mol Biol 2019 ;1894:123-131

Department of Physiology and Pharmacology, Robert C. Byrd Health Science Center, School of Medicine,, West Virginia University, Morgantown, WV, USA.

Mitochondria hold a critical role in cell metabolism and homeostasis. Mitochondrial injury plays central part in deciding cell fate especially in programmed cell death pathways. Various nanomaterials lead to different cell death modalities by inducing mitochondrial injury. Read More

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January 2019

Preparation and Utilization of a 3D Human Liver Microtissue Model for Nanotoxicological Assessment.

Authors:
Ali Kermanizadeh

Methods Mol Biol 2019 ;1894:47-55

Nano Safety Research Group, School of Engineering and Physical Science, Institute of Biological Chemistry, Biophysics and Bioengineering, Heriot-Watt University, Edinburgh, UK.

The liver is the principal detoxification center of the body, removing xenobiotics and waste products which could potentially include some nanomaterials (NM). With the ever increasing public and occupational exposure associated with accumulative production of nanomaterials, there is an urgent need to consider the possibility of harmful health consequences of engineered NM exposure. It is understood that following exposure via inhalation, ingestion, or direct intravenous injection a fraction of NMs reach the liver. Read More

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January 2019

High-throughput continuous rotation electron diffraction data acquisition software automation.

J Appl Crystallogr 2018 Dec 22;51(Pt 6):1652-1661. Epub 2018 Nov 22.

Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, SE-10691, Sweden.

Single-crystal electron diffraction (SCED) is emerging as an effective technique to determine and refine the structures of unknown nano-sized crystals. In this work, the implementation of the continuous rotation electron diffraction (cRED) method for high-throughput data collection is described. This is achieved through dedicated software that controls the transmission electron microscope and the camera. Read More

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December 2018

Chemoprotective effect of nanocurcumin on 5-fluorouracil-induced-toxicity toward oral cancer treatment.

Natl J Maxillofac Surg 2018 Jul-Dec;9(2):160-166

Department of Oral Pathology and Microbiology, King George's Medical University, Lucknow, Uttar Pradesh, India.

Introduction: Cancer of oral cavity is the uncontrolled expansion of damaged cell within the mouth cavity. 5-fluorouracil (5-FU) chemotherapy was focused to kill the cancer cell, but it would affect the surrounding normal cells during oral cancer treatment. This study included the evaluation of chemoprotective effects of curcumin (CU), as an herbal remedy, on 5-FU-induced-cytotoxicity toward oral cancer treatment, loaded within a nanocarrier system. Read More

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December 2018

Evaluation of remineralization potential and mechanical properties of pit and fissure sealants fortified with nano-hydroxyapatite and nano-amorphous calcium phosphate fillers: An study.

J Conserv Dent 2018 Nov-Dec;21(6):681-690

Department of Prosthodontics, Maulana Azad Institute of Dental Sciences, New Delhi, India.

Objectives: The aim of this study was: (i) to formulate pit and fissure sealants (PFS) containing nano-hydroxyapatite (nHAP) filler; nHAP filler and silica co-filler; nHAP and nano-Amorphous Calcium Phosphate (nACP) co-filler, (ii) to evaluate physical properties; degree of conversion (DOC), curing depth (CD) and mechanical properties; microshear bond strength (MBS) of fortified PFS, and (iii) to assess remineralization potential and release of Ca and PO ions from newly synthesized sealants.

Materials And Methods: Four PFS were prepared using monomers with mixture of 35.5 wt % BisGMA, 35. Read More

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December 2018

A Universal Solution of Controlling the Distribution of Multimaterials during Macroscopic Manipulation via a Microtopography-Guided Substrate.

Nanomaterials (Basel) 2018 Dec 12;8(12). Epub 2018 Dec 12.

Key Laboratory of Micro-systems and Micro-structures Manufacturing, Ministry of Education, Harbin Institute of Technology, Harbin 150080, China.

Any object can be considered as a spatial distribution of atoms and molecules; in this sense, we can manufacture any object as long as the precise distribution of atoms and molecules is achieved. However, the current point-by-point methods to precisely manipulate single atoms and single molecules, such as the scanning tunneling microscope (STM), have difficulty in manipulating a large quantity of materials within an acceptable time. The macroscopic manipulation techniques, such as magnetron sputtering, molecular beam epitaxy, and evaporation, could not precisely control the distribution of materials. Read More

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December 2018

Magnetic Nanoparticle-Based Biosensing Assay Quantitatively Enhances Acid-Fast Bacilli Count in Paucibacillary Pulmonary Tuberculosis.

Biosensors (Basel) 2018 Dec 12;8(4). Epub 2018 Dec 12.

Global Alliance for Rapid Diagnostics. Michigan State University, East Lansing, MI 48824, USA.

A new method using a magnetic nanoparticle-based colorimetric biosensing assay (NCBA) was compared with sputum smear microscopy (SSM) for the detection of pulmonary tuberculosis (PTB) in sputum samples. Studies were made to compare the NCBA against SSM using sputum samples collected from PTB patients prior to receiving treatment. Experiments were also conducted to determine the appropriate concentration of glycan-functionalized magnetic nanoparticles (GMNP) used in the NCBA and to evaluate the optimal digestion/decontamination solution to increase the extraction, concentration and detection of acid-fast bacilli (AFB). Read More

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December 2018

Assessment of the Influence of Acetic Acid Residue on Type I Collagen during Isolation and Characterization.

Materials (Basel) 2018 Dec 11;11(12). Epub 2018 Dec 11.

Graduate Program of Nano Science and Technology, Graduate School of Yonsei University, Seoul 03722, Korea.

Various methods for isolation of type I collagen using acids, bases, enzymes, and their combinations have been applied. However, a lack of standardization exists among type I collagens isolated by various approaches. Consequently, in this study, we assessed the influence of acetic acid residue on type I collagen isolated by pepsin-acetic acid treatment, the fabrication of collagen-based porous scaffolds, and the seeded cells on collagen scaffolds. Read More

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December 2018
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Mesoporous Highly-Deformable Composite Polymer for a Gapless Triboelectric Nanogenerator via a One-Step Metal Oxidation Process.

Micromachines (Basel) 2018 Dec 11;9(12). Epub 2018 Dec 11.

Aircraft System Technology Group, Korea Institute of Industrial Technology (KITECH), 57, Yangho-gil, Yeongcheon-si, Gyeongbuk-do 38822, Korea.

The oxidation of metal microparticles (MPs) in a polymer film yields a mesoporous highly-deformable composite polymer for enhancing performance and creating a gapless structure of triboelectric nanogenerators (TENGs). This is a one-step scalable synthesis for developing large-scale, cost-effective, and light-weight mesoporous polymer composites. We demonstrate mesoporous aluminum oxide (Al₂O₃) polydimethylsiloxane (PDMS) composites with a nano-flake structure on the surface of Al₂O₃ MPs in pores. Read More

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December 2018

Shear-Assisted Laser Transfer of Metal Nanoparticle Ink to an Elastomer Substrate.

Materials (Basel) 2018 Dec 11;11(12). Epub 2018 Dec 11.

Optical Nanoprocessing Lab, Department of Mechanical Engineering, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do 15588, Korea.

Selective laser sintering of metal nanoparticle ink is an attractive technology for the creation of metal layers at the microscale without any vacuum deposition process, yet its application to elastomer substrates has remained a highly challenging task. To address this issue, we introduced the shear-assisted laser transfer of metal nanoparticle ink by utilizing the difference in thermal expansion coefficients between the elastomer and the target metal electrode. The laser was focused and scanned across the absorbing metal nanoparticle ink layer that was in conformal contact with the elastomer with a high thermal expansion coefficient. Read More

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December 2018

Studies on Silver Ions Releasing Processes and Mechanical Properties of Surface-Modified Titanium Alloy Implants.

Int J Mol Sci 2018 Dec 9;19(12). Epub 2018 Dec 9.

Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina 7, 87-100 Toruń, Poland.

Dispersed silver nanoparticles (AgNPs) on the surface of titanium alloy (Ti6Al4V) and titanium alloy modified by titania nanotube layer (Ti6Al4V/TNT) substrates were produced by the chemical vapor deposition method (CVD) using a novel precursor of the formula [Ag₅(O₂CC₂F₅)₅(H₂O)₃]. The structure and volatile properties of this compound were determined using single crystal X-ray diffractometry, variable temperature IR spectrophotometry (VT IR), and electron inducted mass spectrometry (EI MS). The morphology and the structure of the produced Ti6Al4V/AgNPs and Ti6Al4V/TNT/AgNPs composites were characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Read More

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December 2018

Facile Synthesis of Silver Nanoparticles with High Antibacterial Activity.

Materials (Basel) 2018 Dec 8;11(12). Epub 2018 Dec 8.

Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen 361005, China.

We report on a reverse microemulsion method for the synthesis of silver nanocrystals and examine their antibacterial activities. As the molar ratio of water to sodium bis(2-ethylhexyl) sulfosuccinate (AOT) increases to 25, a morphology transition from a sphere-like nanocrystal to a wire-like one was observed. For both the gram-negative and gram-positive bacteria, the wire-like silver nanocrystal showed higher antibacterial activities. Read More

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December 2018

Role of Si and C Impurities in Yellow and Blue Luminescence of Unintentionally and Si-Doped GaN.

Nanomaterials (Basel) 2018 Dec 10;8(12). Epub 2018 Dec 10.

Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215123, China.

Both yellow luminescence (YL) and blue luminescence (BL) bands of GaN films have been investigated for decades, but few works report the relationship between them. In this study, two sets of GaN samples grown via metalorganic chemical vapor deposition (MOCVD) were investigated. A close relationship was found between the YL and BL bands for unintentionally doped GaN and Si-doped GaN samples, both of which were grown without intentional acceptor doping. Read More

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December 2018

A Novel Class of Injectable Bioceramics that Glue Tissues and Biomaterials.

Materials (Basel) 2018 Dec 7;11(12). Epub 2018 Dec 7.

Applied material science, Department of Engineering, Uppsala University, Uppsala 75121, Sweden.

Calcium phosphate cements (CPCs) are clinically effective void fillers that are capable of bridging calcified tissue defects and facilitating regeneration. However, CPCs are completely synthetic/inorganic, unlike the calcium phosphate that is found in calcified tissues, and they lack an architectural organization, controlled assembly mechanisms, and have moderate biomechanical strength, which limits their clinical effectiveness. Herein, we describe a new class of bioinspired CPCs that can glue tissues together and bond tissues to metallic and polymeric biomaterials. Read More

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December 2018
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Protein Food Matrix⁻ZnO Nanoparticle Interactions Affect Protein Conformation, but May not Be Biological Responses.

Int J Mol Sci 2018 Dec 7;19(12). Epub 2018 Dec 7.

Major of Food Science & Technology, Division of Applied Food System, Seoul Women's University, Seoul 01797, Korea.

Because of their nutritional value, zinc oxide (ZnO) nanoparticles (NPs) are applied as a dietary source of zinc, by direct addition to complex, multiple-component food matrices. The thereby occurring interactions of NPs with food matrices may have biological or toxic effects. In particular, NP interactions with food protein can lead to structural deformation of the latter, potentially changing its digestive efficiency and gastrointestinal absorption. Read More

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December 2018

Antioxidant Properties and the Formation of Iron Coordination Complexes of 8-Hydroxyquinoline.

Int J Mol Sci 2018 Dec 7;19(12). Epub 2018 Dec 7.

Division of Molecular Systems Biology, Department of Ecogenomics and Systems Biology, Faculty of Life Sciences, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria.

Background: The alkaloid 8-hydroxyquinoline (8HQ) is well-known for various biological activities, including antioxidant effects and especially for the formation of coordination complexes with various transition metals, such as iron, amongst others. Therefore, 8HQ was extensively explored as a promising antineurodegenerative agent. However, other authors noted pro-oxidant effects of 8HQ. Read More

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December 2018

A remarkable thermosensitive hydrogel cross-linked by two inorganic nanoparticles with opposite charges.

J Colloid Interface Sci 2018 Dec 4;538:530-540. Epub 2018 Dec 4.

College of Chemistry and Material Science, Shandong Agricultural University, 61 Daizong Street, Tai'an, Shandong 271018, PR China. Electronic address:

Herein, we report the successful synthesis of a series of poly (N-isopropylacrylamide) (PNIPA)/layered double hydroxides (LDHs)/nano-hydroxyapatite (nano-HA) hydrogels via in-situ radical polymerization. The internal morphology, thermo sensitivity, rheological properties, swelling behavior and hemocompatibility of the PNIPA/LDHs/HA composite hydrogels were systematically investigated. Results show that the hydrogels had a reversible sol-gel transformation around 33 °C. Read More

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December 2018

Influence of sulfadiazine on anaerobic fermentation of waste activated sludge for volatile fatty acids production: Focusing on microbial responses.

Chemosphere 2018 Dec 4;219:305-312. Epub 2018 Dec 4.

State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, China.

Extensive studies on anaerobic fermentation of waste activated sludge (WAS) for volatile fatty acids (VFAs) production focused on the effects of operating parameters and pretreatment methods, and little information is available for those of organic pollutants which were absorbed on sludge. The influence of sulfadiazine (SDZ), a typical antibiotic pollutant in WAS, on VFAs production during anaerobic fermentation was investigated in this study. The accumulation of VFAs was remarkably affected in the presence of SDZ. Read More

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December 2018

Photoelectrocatalytic decolorization of azo dyes with nano-composite oxide layers of ZnO nanorods decorated with Ag nanoparticles.

Chemosphere 2018 Dec 3;219:296-304. Epub 2018 Dec 3.

Universidad Nacional De Ingeniería, Lima, Peru.

Photoelectrocatalysis provides an excellent frame for the application of photocatalytic nanostructured materials on easy recoverable supports. This study reports the two-step synthesis of hierarchically nanostructured ZnO/Ag composite photoelectrodes. Wurtzite ZnO was selectively electronucleated as spheroidal seeds on fluor doped tin oxide substrates and nanodecorated with Ag nanoclusters under electrochemical control. Read More

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December 2018