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https://www.readbyqxmd.com/read/28728112/reductive-defluorination-of-perfluorooctanoic-acid-by-titanium-iii-citrate-with-vitamin-b12-and-copper-nanoparticles
#1
Yu-Chi Lee, Yi-Pei Chen, Meng-Jia Chen, Jeff Kuo, Shang-Lien Lo
Perfluorooctanoic acid (PFOA) is widespread in the environment, which causes serious health and safety concerns. A mechanistic study on reductive defluorination of PFOA by titanium(III) citrate in the presence of catalysts was conducted. Vitamin B12 was used to catalyze reduction reactions by shuttling electrons from a reducing agent (electron donor) to PFOA to produce a Co-carbon bond intermediates. In the presence of copper nanoparticles, a precursor complex, B12-C7F14COOH, adsorbed on the metal surface, followed by a hydrogenolytic reaction to form less-fluorinated products...
June 29, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28727434/ellipsometry-of-colloidal-solutions-new-experimental-setup-and-application-to-metallic-colloids
#2
Yann Battie, Michel Stchakovsky, Aotmane En Naciri, Suzanna Akil, Nouari Chaoui, Laurent Broch
An ellipsometric cell is developed to simultaneously determine the shape distribution, the volume fraction, and the complex refractive index of gold and silver colloids. Simulation reveals that this cell drastically improves the detection limit of ellipsometry. Indeed, Ag and Au nanoparticles (NPs) are detected at the ppmv level. We demonstrate that the NPs shape distribution can be estimated from ellipsometric measurements by analyzing them with a shape distributed effective medium theory (SDEMT). The obtained distributions from ellipsometry are in agreement with those deduced from transmission electron microcopy (TEM)...
July 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28727409/plasmonic-nano-oven-by-concatenation-of-multishell-photo-thermal-enhancement
#3
Lijun Meng, Renwen Yu, Min Qiu, F Javier Garcia de Abajo
Metallodielectric multishell nanoparticles are capable of hosting collective plasmon oscillations distributed among different metallic layers, which result in large near-field enhancement at specific regions of the structure, where light absorption is maximized. We exploit this capability of multishell nanoparticles, combined with thermal boundary resistances and spatial tailoring of the optical near fields, to design plasmonic nano-ovens capable of achieving high temperatures at the core region using moderate illumination intensities...
July 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/28726943/low-temperature-atomic-layer-deposition-delivers-more-active-and-stable-pt-based-catalysts
#4
Hao Van Bui, Fabio Grillo, Sri Sharath Kulkarni, Ronald Bevaart, Nguyen Van Thang, Bart van der Linden, Jacob A Moulijn, Michiel Makkee, Michiel T Kreutzer, J Ruud van Ommen
We tailored the size distribution of Pt nanoparticles (NPs) on graphene nanoplatelets at a given metal loading by using low-temperature atomic layer deposition carried out in a fluidized bed reactor operated at atmospheric pressure. The Pt NPs deposited at low temperature (100 °C) after 10 cycles were more active and stable towards the propene oxidation reaction than their high-temperature counterparts. Crucially, the gap in the catalytic performance was retained even after prolonged periods of time (>24 hours) at reaction temperatures as high as 450 °C...
July 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28726937/novel-nanoparticles-with-cr-3-substituted-ferrite-for-self-regulating-temperature-hyperthermia
#5
Wei Zhang, Xudong Zuo, Ying Niu, Chengwei Wu, Shuping Wang, Shui Guan, S Ravi P Silva
For hyperthermia to be used under clinical conditions for cancer therapeutics the temperature regulation needs to be precise and accurately controllable. In the case of the metal nanoparticles used for such activities, a high coercivity is a prerequisite in order to couple more energy in a single heating cycle for efficient and faster differential heating. The chemically stable Co-Zn ferrite nanoparticles have typically not been used in such self-regulating hyperthermia temperature applications to date due to their low Curie temperature usually accompanied by a poor coercivity...
July 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28726382/interparticle-reactions-an-emerging-direction-in-nanomaterials-chemistry
#6
K R Krishnadas, Ananya Baksi, Atanu Ghosh, Ganapati Natarajan, Anirban Som, Thalappil Pradeep
Nanoparticles exhibit a rich variety in terms of structure, composition, and properties. However, reactions between them remain largely unexplored. In this Account, we discuss an emerging aspect of nanomaterials chemistry, namely, interparticle reactions in solution phase, similar to reactions between molecules, involving atomically precise noble metal clusters. A brief historical account of the developments, starting from the bare, gas phase clusters, which led to the synthesis of atomically precise monolayer protected clusters in solution, is presented first...
July 20, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28726381/impact-of-the-metallic-crystalline-structure-on-the-properties-of-nanocrystals-and-their-mesoscopic-assemblies
#7
Marie-Paule Pileni
The spontaneous assembly of uniform-sized globular entities into ordered arrays is a universal phenomenon observed for objects with diameters spanning a broad range of length scales. These extend from the atomic scale (10(-8) cm), through molecular and macromolecular scales with proteins, synthetic low polymers, and colloidal crystals (∼10(-6) cm), to the wavelength of visible light (∼10(-5) cm). The associated concepts of sphere packing have had an influence in diverse fields ranging from pure geometrical analysis to architectural models or ideals...
July 20, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28726378/ptnps-as-scaffolds-to-regulate-interenzyme-distance-for-construction-of-efficient-enzyme-cascade-amplification-for-ultrasensitive-electrochemical-detection-of-mmp-2
#8
Beibei Kou, Yaqin Chai, Yali Yuan, Ruo Yuan
The high catalytic efficiency of enzyme cascade reaction mainly depends on optimal interenzyme distance regulated by the special scaffolds. In this work, the rigid PtNPs with different sizes were employed as scaffolds to regulate interenzyme distance for efficient enzyme cascade amplification to construct electrochemical biosensor for sensitive detection of matrix metalloproteinases-2 (MMP-2), which overcame the drawbacks of instable construction and sophisticated preparation induced by conventional scaffolds such as metal-organic frameworks (MOFs), DNA nanostructures...
July 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28726376/dentritic-cuptpd-catalyst-for-enhanced-electrochemical-oxidation-of-methanol
#9
Xiaoqin Shi, Ying Wen, Xiaoyu Guo, Yuxia Pan, Yuanyuan Ji, Ye Ying, Hai-Feng Yang
The CuPtPd catalyst is designed and synthesized successfully via directly reducing metal ions. The composition, morphology and structure of the as-prepared CuPtPd nanohybrids are characterized by scanning electron microscope (SEM) and transmission electron microscopy (TEM), energy-dispersive spectrometer (EDS), selected-area electron diffraction (SAED), X-ray diffraction (XRD), and inductively coupled plasma atomic emission spectrometry (ICP-AES). By comparison of the electrocatalytic properties of the ternary CuPtPd catalyst with bimetallic catalysts, we find that ternary nanocomposites perform better electrocatalytic and anti-poisoning activity towards oxidation of methanol...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28725890/one-step-synthesis-of-novel-cu-polymer-nanocomposites-through-a-self-activated-route-and-their-application-as-nonenzymatic-glucose-sensors
#10
Yinlin Tong, Jiaying Xu, Hong Jiang, Feng Gao, Qingyi Lu
In this study, we developed a one-step self-activated route for synthesizing novel core-shell Cu@polymer nanocomposites. Under solvothermal conditions, Cu(2+) was reduced to metal copper by formaldehyde and salicylaldehyde and the newly generated copper crystals acted as the catalysts to activate the condensation polymerization between formaldehyde and salicylaldehyde, resulting in the formation of core-shell Cu@polymer nanocomposites with Cu nanoparticles as the cores and polymer as the shells. The Cu@polymer nanocomposites can be applied as a nonenzymatic sensor for glucose detection...
July 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28725018/morphology-transition-engineering-of-zno-nanorods-to-nanoplatelets-grafted-mo8o23-moo2-by-polyoxometalates-mechanism-and-possible-applicability-to-other-oxides
#11
Ahmed H Abdelmohsen, Waleed M A El Rouby, Nahla Ismail, Ahmed A Farghali
A new fundamental mechanism for reliable engineering of zinc oxide (ZnO) nanorods to nanoplatelets grafted Mo8O23-MoO2 mixed oxide with controlled morphology, composition and precise understanding of the nanoscale reaction mechanism was developed. These hybrid nanomaterials are gaining interest due to their potential use for energy, catalysis, biomedical and other applications. As an introductory section, we demonstrate a new expansion for the concept 'materials engineering' by discussing the fabrication of metal oxides nanostructures by bottom-up approach and carbon nanoparticles by top-down approach...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28723203/multicolor-functional-carbon-dots-via-one-step-refluxing-synthesis
#12
Ting-Yi Wang, Chong-You Chen, Chang-Ming Wang, Ying Zi Tan, Wei-Ssu Liao
Carbon dots are admirable fluorescent nanomaterials due to their low cost, high photostability, excellent biocompatibility, and environmental friendliness. Most conventional carbon dot fabrication approaches produce single-colored fluorescent material in the preparation process; different methods are therefore required to synthesize distinct carbon dots for specific optical applications. In this study, carbon dots carrying different emission colors are prepared through a one-step refluxing process. The emission of these materials can be well-tuned by sodium hydroxide content in the precursor solution...
March 24, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723143/an-ultrasensitive-plasmonic-nanosensor-for-aldehydes
#13
Meng Li, Lei Shi, Tao Xie, Chao Jing, Guangli Xiu, Yi-Tao Long
Glucose is the most common but important aldehyde, and it is necessary to create biosensors with high sensitivity and anti-interference to detect it. Under the existence of silver ions and aldehyde compounds, single gold nanoparticles and freshly formed silver atoms could respectively act as core and shell, which finally form a core-shell structure. By observing the reaction between glucose and Tollens' reagent, metallic silver was found to be reduced on the surface of gold nanoparticles and formed Au@Ag nanoparticles that lead to a direct wavelength shift...
February 24, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723097/decorating-of-ag-and-cuo-on-cu-nanoparticles-for-the-enhanced-high-catalytic-activity-to-the-degradation-of-organic-pollutants
#14
Yu Liang, Zhe Chen, Wen Yao, Pengyi Wang, Shujun Yu, Xiangke Wang
The metal/semiconductor composites are promising catalysts with superior catalytic activity. In this work, a Cu/CuO-Ag composite with structure that Ag and CuO nanoparticles (NPs) decorated on the surface of Cu were fabricated via a facile in-situ method. With the characterization by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDX) and inductively coupled plasma atomic emission spectrometry (ICP-AES), the structure and structure and component of Cu/CuO-Ag composite were well-defined...
July 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28723093/plasmonic-aerogels-as-a-3d-nanoscale-platform-for-solar-fuels-photocatalysis
#15
Paul A DeSario, Jeremy J Pietron, Adam Dunkelberger, Todd H Brintlinger, Olga Baturina, Rhonda M Stroud, Jeffrey C Owrutsky, Debra R Rolison
We use plasmonic Au-TiO2 aerogels as a platform in which to marry synthetically thickened particle-particle junctions in TiO2 aerogel networks and Au||TiO2 interfaces and then investigate their cooperative influence on photocatalytic hydrogen (H2) generation under both broadband (i.e., UV + visible light) and visible-only excitation. In doing so, we elucidate the dual functions that incorporated Au can play as a water reduction/H2 generation co-catalyst and as a plasmonic sensitizer. We also introduce non-plasmonic Pt co-catalyst nanoparticles into our composite aerogels in order to leverage the catalytic water-reducing abilities of Pt...
July 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28723090/transformative-heterointerface-evolution-and-plasmonic-tuning-of-anisotropic-trimetallic-nanoparticles
#16
Mouhong Lin, Gyeong-Hwan Kim, Jae-Ho Kim, Jeong-Wook Oh, Jwa-Min Nam
Multi-component nanoparticles that incorporate multiple nano-crystal domains into a single particle represent an important class of material with highly tailorable structures and properties. The controlled synthesis of multi-component NPs with 3 or more components with the desired structure, particularly aniso-tropic structures, and property is, however, highly challenging. Here, we developed a polymer and galvanic replacement reac-tion-based transformative heterointerface evolution (THE) method to form and tune gold-copper-silver multi-metallic ani-sotropic nanoparticles (MAPs) with well-defined configurations, including structural order, uniformity and junction geometry, giving rise to extraordinarily high tunability in the structural design, synthesis and optical property of tri-metallic plasmonic nanoantenna structures...
July 19, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28722797/highly-selective-enrichment-of-phosphopeptides-by-on-chip-indium-oxide-functionalized-magnetic-nanoparticles-coupled-with-maldi-tof-ms
#17
Dandan Jiang, Naizhong Song, Xiqian Li, Jiutong Ma, Qiong Jia
Selective and efficient preconcentration is indispensable for low concentration of phosphopeptides in phosphorylated protein-related samples prior to MS-based analysis. Herein, an on-chip system coupled magnetic SPE with MALDI-TOF MS was designed. A metal oxide affinity chromatography (MOAC) material, indium oxide, was coated on the surface of Fe3 O4 magnetic nanoparticles (MNPs) to prepare the adsorbent, spatially confined with an applied magnetic field. The adsorbent exhibited high selectivity for phosphopeptides in tryptic digests of the mixture of β-casein and BSA (1:1000) and the mixture of β-casein, BSA, and ovalbumin (1:100:100)...
July 19, 2017: Proteomics
https://www.readbyqxmd.com/read/28722486/neurotoxic-effects-of-subchronic-intratracheal-mn-nanoparticle-exposure-alone-and-in-combination-with-other-welding-fume-metals-in-rats
#18
Zsuzsanna Máté, Edina Horváth, András Papp, Krisztina Kovács, Etelka Tombácz, Dániel Nesztor, Tamás Szabó, Andrea Szabó, Edit Paulik
Manganese (Mn) is a toxic heavy metal exposing workers in various occupational settings and causing, among others, nervous system damage. Metal fumes of welding, a typical source of Mn exposure, contain a complex mixture of metal oxides partly in nanoparticle form. As toxic effects of complex substances cannot be sufficiently understood by examining its components separately, general toxicity and functional neurotoxicity of a main pathogenic welding fume metal, Mn, was examined alone and combined with iron (Fe) and chromium (Cr), also frequently found in fumes...
July 19, 2017: Inhalation Toxicology
https://www.readbyqxmd.com/read/28722447/fluorescence-sensing-of-circulating-diagnostic-biomarkers-using-molecular-probes-and-nanoparticles
#19
Oya Tagit, Niko Hildebrandt
The interplay of photonics, nanotechnology, and biochemistry has significantly improved the identification and characterization of multiple types of biomarkers by optical biosensors. Great achievements in fluorescence-based technologies have been realized, for example, by the advancement of multiplexing techniques or the introduction of nanoparticles to biochemical and clinical research. This review presents a concise overview of recent advances in fluorescence sensing techniques for the detection of circulating disease biomarkers...
January 27, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28722444/topographically-flat-nanoplasmonic-sensor-chips-for-biosensing-and-materials-science
#20
Ferry Anggoro Ardy Nugroho, Rickard Frost, Tomasz J Antosiewicz, Joachim Fritzsche, Elin M Larsson Langhammer, Christoph Langhammer
Nanoplasmonic sensors typically comprise arrangements of noble metal nanoparticles on a dielectric support. Thus, they are intrinsically characterized by surface topography with corrugations at the 10-100 nm length scale. While irrelevant in some bio- and chemosensing applications, it is also to be expected that the surface topography significantly influences the interaction between solids, fluids, nanoparticles and (bio)molecules, and the nanoplasmonic sensor surface. To address this issue, we present a wafer-scale nanolithography-based fabrication approach for high-temperature compatible, chemically inert, topographically flat, and laterally homogeneous nanoplasmonic sensor chips...
January 27, 2017: ACS Sensors
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