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Nanoscale

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https://www.readbyqxmd.com/read/28820531/phytic-acid-assisted-electrochemically-synthesized-three-dimensional-o-p-functionalized-graphene-monoliths-with-high-capacitive-performance
#1
Han-Yu Li, Lang Liu, Zhi-Wei Zhang, Shu-Shen Wang, Yao Yu, Lin Liu, Yue Wu
Three-dimensional functionalized graphene monoliths (3DFGMs) have attracted intensive attention as energy storage materials due to their unique interconnected porous structure, good electrical conductivity, excellent mechanical strength, and pseudocapacitive characteristic. Herein, we report a facile, green and low-cost strategy through a simple, one-step electrochemical process in a phytic acid solution to fabricate a 3DFGM. The 3D porous structure and functionalization of graphene can be obtained simultaneously...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28820224/label-free-fluorescent-immunoassay-for-cu-2-ion-detection-based-on-uv-degradation-of-immunocomplex-and-metal-ion-chelates
#2
Qi Shu, Mengli Liu, Hui Ouyang, Zhifeng Fu
A mouse anti Cu(2+)-EDTA monoclonal antibody was used to capture EDTA chelated Cu(2+) ions. Then UV radiation was utilized to degrade immunocomplex and Cu(2+)-EDTA chelates to release free Cu(2+) ions. Based on their quenching effect to the fluorescent emission of CdSe/ZnS quantum dots, the released Cu(2+) ions could be detected with ideal specificity and high sensitivity.
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28820223/a-dual-modal-silver-bumpy-nanoprobe-for-photoacoustic-imaging-and-sers-multiplexed-identification-of-in-vivo-lymph-nodes
#3
Myeong Geun Cha, Seunghyun Lee, Sungjo Park, Homan Kang, Sung Gun Lee, Cheolhwan Jeong, Yoon-Sik Lee, Chulhong Kim, Dae Hong Jeong
Multimodal imaging can provide complementary biomedical information which has huge potential in pre-clinical and clinical imaging and sensing. In this study, we introduce dual modal NIR silver bumpy nanoprobes for in vivo imaging and multiplexed detection of biomolecules by both photoacoustic imaging (PAI) and surface-enhanced Raman scattering (SERS) techniques. For this study, we used silica-coated silver bumpy nanoshell probes (AgNS@SiO2). AgNS@SiO2 have strong NIR-absorption and scattering properties compared with other nanostructures, and therefore, can be a good candidate for photoacoustic (PA) and SERS multimodal imaging...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28820222/quasi-zero-dimensional-cobalt-doped-ceo2-dots-on-pd-catalysts-for-alcohol-electro-oxidation-with-enhanced-poisoning-tolerance
#4
Qiang Tan, Haiyan Zhu, Shengwu Guo, Yuanzhen Chen, Tao Jiang, Chengyong Shu, Shaokun Chong, Benjamin Hultman, Yongning Liu, Gang Wu
Deactivation of an anode catalyst resulting from the poisoning of COad-like intermediates is one of the major problems for methanol and ethanol electro-oxidation reactions (MOR & EOR), and remains a grand challenge towards achieving high performance for direct alcohol fuel cells (DAFCs). Herein, we report a new approach for the preparation of ultrafine cobalt-doped CeO2 dots (Co-CeO2, d = 3.6 nm), which can be an effective anti-poisoning promoter for Pd catalysts towards MOR and EOR in alkaline media. Compared to Pd/CeO2 and pure Pd, the hybrid Pd/Co-CeO2 nanocomposite catalyst exhibited a much enhanced activity and remarkable anti-poisoning ability for both MOR and EOR...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28820221/real-time-monitoring-of-plasmon-induced-proton-transfer-of-hypoxanthine-in-serum
#5
Binbin Zhou, Shaofei Li, Xianghu Tang, Pan Li, Xiaomin Cao, Borong Yu, Liangbao Yang, Jinhuai Liu
Intramolecular proton transfer of hypoxanthine, induced by application of a laser on the surface of a bare noble nanomaterial, was monitored in real time using surface-enhanced Raman spectroscopy (SERS). This monitoring demonstrated the dependence of the reaction on the identity of the nanomaterial and on the laser power density. The results pave the way for monitoring the proton transfer reaction in various relevant fields. In addition, we observed the presence of the proton transfer phenomenon of hypoxanthine in serum, providing a way to avoid the effect of proton transfer and hence achieve more reliable spectra of sera for clinical diagnosis...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28820220/real-time-plasmon-spectroscopy-study-of-the-solid-state-oxidation-and-kirkendall-void-formation-in-copper-nanoparticles
#6
Mariano D Susman, Yishai Feldman, Tatyana A Bendikov, Alexander Vaskevich, Israel Rubinstein
Oxidation and corrosion reactions have a major effect on the application of non-noble metals. Kinetic information and simple theoretical models are often insufficient for describing such processes in metals at the nanoscale, particularly in cases involving formation of internal voids (nano Kirkendall effect, NKE) during oxidation. Here we study the kinetics of solid-state oxidation of chemically-grown copper nanoparticles (NPs) by in situ localized surface plasmon resonance (LSPR) spectroscopy during isothermal annealing in the range 110-170 °C...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28820219/mo-doped-ni2p-nanowire-arrays-an-efficient-electrocatalyst-for-the-hydrogen-evolution-reaction-with-enhanced-activity-at-all-ph-values
#7
Yiqiang Sun, Lifeng Hang, Qi Shen, Tao Zhang, Huilin Li, Xiaomin Zhang, Xianjun Lyu, Yue Li
We report the successful synthesis of Mo doped Ni2P nanowires (NWs) on a Ni foam (NF) substrate by a two-step strategy, which could be used as an efficient and stable hydrogen evolution reaction (HER) electrocatalyst over the whole pH range (0-14). Electrochemical investigations demonstrated that Mo doping made the catalytic activity of Ni2P significantly enhanced. To achieve a current density of 10 mA cm(-2), Mo-Ni2P NWs/NF required an overpotential of 67 mV in acidic solution, 78 mV in alkaline solution and 84 mV in neutral solution...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28820215/how-exfoliated-graphene-oxide-nanosheets-organize-at-the-water-interface-evidence-for-a-spontaneous-bilayer-self-assembly
#8
Nathalie Bonatout, François Muller, Philippe Fontaine, Ignacio Gascon, Oleg Konovalov, Michel Goldmann
In this study, we have characterized graphene oxide films formed at the air-water interface by X-ray reflectivity and grazing incidence X-ray diffraction using synchrotron sources. Surprisingly, the results of both measurements show that at non zero surface pressures, the film is organized as a bilayer of sheets interfaced between air and water with water molecule bridges. Such a spontaneous bilayer structure and its evolution with respect to the surface pressure has been observed for the first time. These results should allow precise control of the density of sheets deposited on the substrate when these films are transferred through the Langmuir Blodgett or Schaefer procedures...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28820212/self-rectifying-bipolar-resistive-switching-memory-based-on-an-iron-oxide-and-graphene-oxide-hybrid
#9
Se-I Oh, Janardhanan R Rani, Sung-Min Hong, Jae-Hyung Jang
A resistive random access memory (RRAM) device with self-rectifying I-V characteristics was fabricated by inserting a silicon nitride (Si3N4) layer between the bottom electrode and solution-processed active material of an iron oxide-graphene oxide (FeOx-GO) hybrid. The fabricated Au/Ni/FeOx-GO/Si3N4/n(+)-Si memory device exhibited an excellent resistive switching ratio and a rectification ratio higher than 10(4). In the Au/Ni/FeOx-GO/Si3N4/n(+)-Si device, resistive switching occurs in both the FeOx-GO and Si3N4 layers separately, resulting in a highly uniform and stable switching performance...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28820209/nizn-double-hydroxide-nanosheet-anchored-nitrogen-doped-graphene-enriched-with-the-%C3%AE-niooh-phase-as-an-activity-modulated-water-oxidation-electrocatalyst
#10
Ayasha Nadeema, Vishal M Dhavale, Sreekumar Kurungot
Herein, we report a facile solvothermal process to synthesize an active electrocatalyst for the oxygen evolution reaction (OER) in an alkaline medium by anchoring nanosheets of a NiZn double hydroxide over nitrogen doped reduced graphene oxide after enriching the system with the γ-NiOOH phase. This catalyst possesses a thin, porous and open layered structure, which makes the system more efficient and accessible for a better electrochemical water oxidation reaction. Moreover, we experimentally demonstrated that incorporation of Zn via a single-step solvothermal method provides an easy approach to obtain plenty of exposed γ-NiOOH phases to make the system more viable for OER with a small overpotential of 290 mV at 10 mA cm(-2) and a Tafel slope of 44 mV per decade...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28820208/positive-zeta-potential-of-nanodiamonds
#11
Laia Ginés, Soumen Mandal, Ashek-I-Ahmed, Chia-Liang Cheng, Maabur Sow, Oliver A Williams
In this paper, the origin of positive zeta potential exhibited by nanodiamond particles is explained. Positive zeta potentials in nano-structured carbons can be explained by the presence of graphitic planes at the surface, which leave oxygen-free Lewis sites and so promotes the suppression of acidic functional groups. Electron Microscopy and Raman Spectroscopy have been used to show that positive zeta potential of nanodiamond is only exhibited in the presence of sp(2) carbon at the surface.
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28819671/fullerenol-nanoparticles-suppress-rankl-induced-osteoclastogenesis-by-inhibiting-differentiation-and-maturation
#12
Huan Geng, Ya-Nan Chang, Xue Bai, Shuitao Liu, Qing Yuan, Weihong Gu, Juan Li, Kui Chen, Gengyan Xing, Gengmei Xing
Bone health requires regulation of homeostatic equilibrium between osteoblasts and osteoclasts. The over-activation of osteoclasts can disrupt bone metabolism, resulting in osteoporosis and other bone-loss diseases. Fullerenol, a polyhydroxy derivative of fullerene, exhibits excellent biocompatibility. Here we show that fullerenol nanoparticles exert two functions: inhibition of osteoclastic differentiation and blockage of pre-osteoclast fusion to restructure osteoclast maturation and function. Experimentally, the nanoparticles reduced pre-osteoclast migration and inhibited ruffled border formation to block their maturation...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28819670/mimicking-wettability-alterations-using-temperature-gradients-for-water-nanodroplets
#13
Chirodeep Bakli, Sree Hari P D, Suman Chakraborty
A sessile droplet or a film usually moves from hotter regions to colder regions, due to variations in interfacial tension. This, known as the so-called Marangoni effect, is true for most pure liquids like water for which the surface tension decreases with an increase in temperature. In stark contrast to this existing understanding, we bring forth the coupled effect of wettability and temperature gradients on the dynamics of the three-phase contact line. By simultaneously tracking the dynamic evolution of the three-phase contact line due to the evaporation and diffusion of molecules through molecular dynamics simulations, we explore the coterminous effects of the change of surface tension coefficients and wetting parameters with temperature on sessile droplets residing on surfaces with different wettabilities...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28819669/drastic-difference-between-hole-and-electron-injection-through-the-gradient-shell-of-cdxseyzn1-xs1-y-quantum-dots
#14
Mohamed Abdellah, Felipe Poulsen, Qiushi Zhu, Nan Zhu, Karel Žídek, Pavel Chábera, Annamaria Corti, Thorsten Hansen, Qijin Chi, Sophie E Canton, Kaibo Zheng, Tõnu Pullerits
Ultrafast fluorescence spectroscopy was used to investigate the hole injection in CdxSeyZn1-xS1-y gradient core-shell quantum dot (CSQD) sensitized p-type NiO photocathodes. A series of CSQDs with a wide range of shell thicknesses was studied. Complementary photoelectrochemical cell measurements were carried out to confirm that the hole injection from the active core through the gradient shell to NiO takes place. The hole injection from the valence band of the QDs to NiO depends much less on the shell thickness when compared to the corresponding electron injection to n-type semiconductor (ZnO)...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28819668/ultralow-flexural-properties-of-copper-microhelices-fabricated-via-electrodeposition-based-three-dimensional-direct-writing-technology
#15
Zhiran Yi, Yu Lei, Xianyun Zhang, Yining Chen, Jianjun Guo, Gaojie Xu, Min-Feng Yu, Ping Cui
Helical metallic micro/nanostructures as functional components have considerable potential for future miniaturized devices, based on their unique mechanical and electrical properties. Thus, understanding and controlling the mechanical properties of metallic helices is desirable for their practical application. Herein, we implemented a direct-writing technique based on the electrodeposition method to grow copper microhelices with well-defined and programmable three-dimensional (3D) features. The mechanical properties of the 3D helical structures were studied by the electrically induced quasistatic and dynamic electromechanical resonance technique...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28819666/ph-responsive-prodrug-nanoparticles-based-on-a-sodium-alginate-derivative-for-selective-co-release-of-doxorubicin-and-curcumin-into-tumor-cells
#16
Cheng Gao, Fan Tang, Guiyi Gong, Jianxiang Zhang, Maggie P M Hoi, Simon M Y Lee, Ruibing Wang
In order to realize a combination of chemotherapy and selective drug release into tumor cells, novel pH-sensitive prodrugnanoparticles were designed and prepared via the self-assembly of a synthetic amphiphilic macromolecular prodrug for the selective co-delivery of doxorubicin (Dox) and curcumin (Cur). Dox was covalently conjugated to the oxidized sodium alginate through a Schiff base reaction to produce an amphiphilic macromolecular prodrug, and the prodrug was subsequently self-assembled into nanoparticles (Dox-NPs) in an aqueous solution, which were responsive to the acidic environment in tumor cells...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28819665/efficient-photoelectrochemical-water-splitting-on-ultrasmall-defect-rich-taox-nanoclusters-enhanced-by-size-selected-pt-nanocluster-promoters
#17
Saurabh Srivastava, Joseph Palathinkal Thomas, Nina Heinig, Marwa Abd-Ellah, Md Anisur Rahman, Kam Tong Leung
Formation of nanoclusters has attracted a lot of attention in recent years because of their distinct properties from isolated atoms and bulk solids. Here, we focus on the catalytic properties of supported transition metal oxide nanoclusters, such as TaO2, with a well-defined size distribution below 10 nm. We show that their catalytic performance can be greatly enhanced by introducing a reaction promoter such as Pt. Different combinations of precisely size-selected, defect-rich TaOx and Pt nanoclusters are produced by a gas-phase aggregation technique in a special DC magnetron sputtering system...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28819664/antimicrobial-carbon-nanospheres
#18
Yao-Wen Jiang, Ge Gao, Xiaodong Zhang, Hao-Ran Jia, Fu-Gen Wu
Carbon nanomaterials have found numerous applications in various fields. However, their synthesis and functionalization usually require complicated procedures or tough experimental conditions. Herein, we report for the first time the synthesis of a new type of functional nanomaterial, quaternized carbon nanospheres (QCNSs), with superior antibacterial activity via a one-pot hydrothermal treatment of chitosan and hexadecylbetaine (abbreviated as BS-16). During the hydrothermal process, the direct reaction and carbonization between the amine-containing chitosan and the carboxyl-containing BS-16 were realized within only one step...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28819660/nanostructured-materials-on-3d-nickel-foam-as-electrocatalysts-for-water-splitting
#19
REVIEW
Nitin K Chaudhari, Haneul Jin, Byeongyoon Kim, Kwangyeol Lee
Highly efficient and low-cost electrocatalysts are essential for water spitting via electrolysis in an economically viable fashion. However, the best catalytic performance is found with noble metal-based electrocatalysts, which presents a formidable obstacle for the commercial success of electrolytic water splitting-based H2 production due to their relatively high cost and scarcity. Therefore, the development of alternative inexpensive earth-abundant electrode materials with excellent electrocatalytic properties is of great urgency...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28819657/dendrimers-meet-zwitterions-development-of-a-unique-antifouling-nanoplatform-for-enhanced-blood-pool-lymph-node-and-tumor-ct-imaging
#20
Zhijuan Xiong, Yue Wang, Jingyi Zhu, Xin Li, Yao He, Jiao Qu, Mingwu Shen, Jindong Xia, Xiangyang Shi
We report the synthesis and characterization of antifouling zwitterion carboxybetaine acrylamide (CBAA)-modified dendrimer-entrapped gold nanoparticles (Au DENPs) for enhanced CT imaging applications. The CBAA-modified nanodevice displays a better protein resistance property, less macrophage cellular uptake and liver accumulation, and longer blood half-delay time than the PEGylated counterpart material, thereby enabling enhanced blood pool, lymph node, and tumor CT imaging.
August 18, 2017: Nanoscale
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