The inhibitory effect of selenium nanoparticles on protein glycation in vitro

Selenium nanoparticles (Se NPs) possess well-known excellent biological activities and low toxicity, and have been employed for numerous applications except as inhibitors to protein glycation. Herein, the present study is carried out to investigate the inhibitory effect of Se NPs on protein glycation in a bovine serum albumin (BSA)/glucose system. By measuring the amount of glucose covalently bound onto BSA, the formation of fructosamine and fluorescent products, it is found that Se NPs can hinder the development of protein glycation in a dose-dependent but time-independent manner under the selected reaction conditions (55 °C, 40 h). And after comparing the increase of inhibitory rate in different stages, it is observed that Se NPs show the greatest inhibitory effect in the early stage, then in the advanced stage, but no effect in the intermediate stage. Fourier transform infrared spectroscopy characterization of Se NPs collected after glycation and determination of ·OH influence...

Shaoxuan Yu, Wentao Zhang, Wei Liu, Wenxin Zhu, Ruochen Guo, Yashan Wang, Daohong Zhang and Jianlong Wang

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Theoretical derivation of anodizing current and comparison between fitted curves and measured curves under different conditions

Anodic TiO 2 nanotubes have been studied extensively for many years. However, the growth kinetics still remains unclear. The systematic study of the current transient under constant anodizing voltage has not been mentioned in the original literature. Here, a derivation and its corresponding theoretical formula are proposed to overcome this challenge. In this paper, the theoretical expressions for the time dependent ionic current and electronic current are derived to explore the anodizing process of Ti. The anodizing current–time curves under different anodizing voltages and different temperatures are experimentally investigated in the anodization of Ti. Furthermore, the quantitative relationship between the thickness of the barrier layer and anodizing time, and the relationships between the ionic/electronic current and temperatures are proposed in this paper. All of the current-transient plots can be fitted consistently by the proposed theoretical expressions. Additiona...



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Metal-enhanced luminescence of silicon quantum dots: effects of nanoparticles and molecular electron donors and acceptors on the photofading kinetics

Alkyl-capped silicon quantum dots (SiQDs) show enhanced luminescence when drop cast as films on glass slides in mixtures with Ag or Au nanoparticles or the electron donor ferrocene (Fc). Metal enhancement of quantum dot photoluminescence (PL) is known to arise from a combination of the intense near-field associated with the surface plasmon of the metal on the rate of absorption and the decrease in the lifetime of the excited state. Here we present evidence that an additional factor is also involved: electron transfer from the metal to the quantum dot. Under CW irradiation with an argon ion laser at 488 nm, SiQDs undergo a reversible photofading of the PL as the particles photoionize. A steady-state condition is established by the competition between photoionization and electron–hole recombination. The fading of the initial PL I 0 to the steady-state value ##IMG## [http://ift.tt/1Er31ur...] {${{I}_{\infty }}$}

Khamael M Abualnaja, Lidija Šiller and Benjamin R Horrocks

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Orientation relationship in WC-Co composite nanoparticles synthesized by in situ reactions

Using the nanoscale violet tungsten oxide as the tungsten source, the WC-Co composite powder was synthesized by the in situ reactions. The particle size of the WC-Co composite powder has a narrow distribution with the mean particle size below 100 nm, and the single composite particle has a nanocrystalline structure with a mean grain size smaller than 10 nm. The detailed characterizations of the nanoparticle microstructure reveal that the orientation relationship and coherence at the interfaces can form during the in situ reactions and further inherit in the consolidated cemented carbide bulk material. The favorable crystallographic characteristics of the WC-Co composite nanoparticles play a significant role in the enhancement of the mechanical properties of the prepared cemented carbide bulk material.

Xilong Wang, Xiaoyan Song, Xuemei Liu, Xingwei Liu, Haibin Wang and Cheng Zhou

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Corrigendum: Calibrated complex impedance and permittivity measurements with scanning microwave microscopy (2014 Nanotechnology 25 [http://ift.tt/1Er32hN] 145703 )

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G Gramse, M Kasper, L Fumagalli, G Gomila, P Hinterdorfer and F Kienberger

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Plasmonic enhancement of the upconversion fluorescence in YVO 4 :Yb 3+ , Er 3+ nanocrystals based on the porous Ag film

The upconversion luminescence (UCL) enhancement based on the surface plasmonic resonance (SPR) of noble metals is a promising way to improve UCL efficiency. However, it is still a challenge to achieve stable and effective UCL enhancement. Here, we present the preparation of the porous Ag/YVO 4 :Yb 3+ , Er 3+ composite film via a simple double annealing method. It is exciting to observe that a maximum 36-fold ( 2 H 11/2 – 4 I 15/2 ) and 30-fold ( 4 S 3/2 – 4 I 15/2 ) UCL enhancement in the porous Ag/YVO 4 :Yb 3+ , Er 3+ composite film, attributed to the effective coupling between SPR and the excitation light by adjusting the SPR peak to the excitation wavelength, controlling the effective coupling distance and improving the scattering–absorption ratio. Furthermore, the enhancement factor strongly depended on the excitation power and the Er 3+ co...

Yongsheng Zhu, Wen Xu, Genquan Li, Shaobo Cui, Xuyan Liu and Hongwei Song

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Heterostructured core–shell ZnMn 2 O 4 nanosheets@carbon nanotubes’ coaxial nanocables: a competitive anode towards high-performance Li-ion batteries

In this study, we rationally designed a rapid, low-temperature yet general synthetic methodology for the first time, involving in situ growth of two-dimensional (2D) birnessite-type MnO 2 nanosheets (NSs) upon each carbon nanotube (CNT), and we designed the subsequent phase transformation into untrathin mesoporous ZnMn 2 O 4 NSs with a thickness of ∼2–3 nm at room temperature to efficiently fabricate heterostructured core–shell ZnMn 2 O 4 NSs@CNT coaxial nanocables with well-dispersed and tunable ZnMn 2 O 4 loading. The underlying insights into the low-temperature formation mechanism of the unique core–shell hybrid nanoarchitectures were tentatively proposed here. When utilized as a high-performance anode for advanced LIBs, the resultant core–shell ZnMn 2 O 4 @CNTs’ coaxial nanocables (∼84.5 wt.% loading) exhibited large specific discharge capacity (∼1033 mAh g −1 ), good rate cap...

Changzhou Yuan, Longhai Zhang, Siqi Zhu, Hui Cao, Jingdong Lin and Linrui Hou

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General nanomoulding with bulk metallic glasses

Bulk metallic glasses (BMGs) are ideal for nanomoulding as they possess desirable strength for molds as well as for moldable materials and furthermore lack intrinsic size limitations. Despite their attractiveness, only recently Pt-based BMGs have been successfully molded into pores ranging 10–100 nm (Kumar et al 2009 Nature 457 [http://ift.tt/1CvKZMl] 868–72 ). Here, we introduce a quantitative theory, which reveals previous challenges in filling nanosized pores. This theory considers, in addition to a viscous and a capillary term, also oxidation, which becomes increasingly more important on smaller length scales. Based on this theory we construct a nanomoulding processing map for BMG, which reveals the limiting factors for BMG nanomoulding. Based on the quantitative prediction of the processing map, we introduce a strategy to reduce the capillary effect through a wetting layer, which allows us to mold non-noble BMGs below 1 μ

Ze Liu and Jan Schroers

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Influence of nanopore surface charge and magnesium ion on polyadenosine translocation

We investigate the influence of a nanopore surface state and the addition of Mg 2+ on poly-adenosine translocation. To do so, two kinds of nanopores with a low aspect ratio (diameter ∼3–5 nm, length 30 nm) were tailored: the first one with a negative charge surface and the second one uncharged. It was shown that the velocity and the energy barrier strongly depend on the nanopore surface. Typically if the nanopore and polyA exhibit a similar charge, the macromolecule velocity increases and its global energy barrier of entrance in the nanopore decreases, as opposed to the non-charged nanopore. Moreover, the addition of a divalent chelating cation induces an increase of energy barrier of entrance, as expected. However, for a negative nanopore, this effect is counterbalanced by the inversion of the surface charge induced by the adsorption of divalent cations.

Mathilde Lepoitevin, Pierre Eugène Coulon, Mikhael Bechelany, Julien Cambedouzou, Jean-Marc Janot and Sebastien Balme

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Top-down silicon microcantilever with coupled bottom-up silicon nanowire for enhanced mass resolution

A stepped cantilever composed of a bottom-up silicon nanowire coupled to a top-down silicon microcantilever electrostatically actuated and with capacitive or optical readout is fabricated and analyzed, both theoretically and experimentally, for mass sensing applications. The mass sensitivity at the nanowire free end and the frequency resolution considering thermomechanical noise are computed for different nanowire dimensions. The results obtained show that the coupled structure presents a very good mass sensitivity thanks to the nanowire, where the mass depositions take place, while also presenting a very good frequency resolution due to the microcantilever, where the transduction is carried out. A two-fold improvement in mass sensitivity with respect to that of the microcantilever standalone is experimentally demonstrated, and at least an order-of-magnitude improvement is theoretically predicted, only changing the nanowire length. Very close frequency resolutions are experimenta...

Gabriel Vidal-Álvarez, Jordi Agustí, Francesc Torres, Gabriel Abadal, Núria Barniol, Jordi Llobet, Marc Sansa, Marta Fernández-Regúlez, Francesc Pérez-Murano, Álvaro San Paulo and Oded Gottlieb

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Enzyme Induced Formation of Monodisperse Hydrogel Nanoparticles Tunable in Size

Chemistry of Materials

DOI: 10.1021/acs.chemmater.5b00187

Vera Bocharova, Danna Sharp, Aaron Jones, Shiwang Cheng, Philip J. Griffin, Alexander L. Agapov, Dmitry Voylov, Yangyang Wang, Alexander Kisliuk, Artem Melman and Alexei P. Sokolov

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Graphene-Templated Synthesis of c-Axis Oriented Sb2Te3 Nanoplates by the Microwave-Assisted Solvothermal Method

Chemistry of Materials

DOI: 10.1021/cm502749y

Swati Singh, Seunghyun Hong, Wonjae Jeon, Dongmok Lee, Jae-Yeol Hwang, Seulky Lim, Gi Duk Kwon, Didier Pribat, Hyunjung Shin, Sung Wng Kim and Seunghyun Baik

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A Bottom-Up Approach to Dual Shape-Memory Effects

Chemistry of Materials

DOI: 10.1021/cm504527w

Juan Wang, Jin Li, Na Li, Xiaolong Guo, Liu He, Xuan Cao, Weiying Zhang, Rongxiang He, Zhiyong Qian, Yiping Cao and Yong Chen

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Postsynthetic Paddle-Wheel Cross-Linking and Functionalization of 1,3-Phenylenebis(azanetriyl)tetrabenzoate-Based MOFs

Chemistry of Materials

DOI: 10.1021/cm5045732

Philipp Müller, Florian M. Wisser, Volodymyr Bon, Ronny Grünker, Irena Senkovska and Stefan Kaskel

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Depth Profiling Charge Accumulation from a Ferroelectric into a Doped Mott Insulator

Nano Letters

DOI: 10.1021/acs.nanolett.5b00104

Maya Marinova, Julien E. Rault, Alexandre Gloter, Slavomir Nemsak, Gunnar K. Palsson, Jean-Pascal Rueff, Charles S. Fadley, Cécile Carrétéro, Hiroyuki Yamada, Katia March, Vincent Garcia, Stéphane Fusil, Agnès Barthélémy, Odile Stéphan, Christian Colliex and Manuel Bibes

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Toward Stable Solar Hydrogen Generation Using Organic Photoelectrochemical Cells

The Journal of Physical Chemistry C

DOI: 10.1021/acs.jpcc.5b01420

Marta Haro, Claudia Solis, Gonzalo Molina, Luis Otero, Juan Bisquert, Sixto Gimenez and Antonio Guerrero

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Physiochemical Investigation of Shape-Designed MnO2 Nanostructures and Their Influence on Oxygen Reduction Reaction Activity in Alkaline Solution

The Journal of Physical Chemistry C

DOI: 10.1021/jp5127915

Karuppiah Selvakumar, Sakkarapalayam Murugesan Senthil Kumar, Rangasamy Thangamuthu, Kruthika Ganesan, Palanichamy Murugan, Parasmani Rajput, Shambhu Nath Jha and Dibyendu Bhattacharyya

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Substitutional or Interstitial Site-Selective Nitrogen Doping in TiO2 Nanostructures

The Journal of Physical Chemistry C

DOI: 10.1021/jp512775s

Jared Lynch, Cinzia Giannini, Jason K. Cooper, Anna Loiudice, Ian D. Sharp and Raffaella Buonsanti

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Design and Synthesis of Bubble-Nanorod-Structured Fe2O3–Carbon Nanofibers as Advanced Anode Material for Li-Ion Batteries

ACS Nano

DOI: 10.1021/acsnano.5b00088

Jung Sang Cho, Young Jun Hong and Yun Chan Kang

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Sorting of Double-Walled Carbon Nanotubes According to Their Outer Wall Electronic Type via a Gel Permeation Method

ACS Nano

DOI: 10.1021/nn506869h

Katherine E. Moore, Moritz Pfohl, Daniel D. Tune, Frank Hennrich, Simone Dehm, Venkata Sai K. Chakradhanula, Christian Kübel, Ralph Krupke and Benjamin S. Flavel

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