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Surface-enhanced Raman scattering inside Au@Ag core/shell nanorods

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Nano Research 2016年第8期9卷 2303-2318页

作者： boris Khlebtsov Institute of Biochemistry and Physiology of Plants and microorganisms Russian Academy of Sciences Saratov 410049 Russia Saratov National Research State University Saratov 410012 Russia

The design and synthesis of plasmonic nanoparticles with Raman-active molecules embedded inside them are of significant interest for sensing and imaging applications. However, direct synthesis of such nanostructures with controllable shape, size, and plasmonic properties remains extremely challenging. Here we report on the preparation of uniform Au@Ag core/sheU nanorods with controllable Ag shells of 1 to 25 nm in thickness. 1,4-Aminothiophenol （4-ATP） molecules, used as the Raman reporters, were located between the Au core and the Ag shell. Successful embedding of reporter molecules inside the core/shell nanoparticles was confirmed by the absence of selective oxidation of the amino groups, as measured by Raman spectroscopy. The dependence of Raman intensity on the location of the reporter molecules in the inside and outside of the nanorods was studied. The molecules in the interior showed strong and uniform Raman intensity, at least an order of magnitude higher than that of the molecules on the nanoparticle surface. In contrast to the usual surface-functionalized Raman tags, aggregation and clustering of nanoparticles with embedded molecules decreased the surface-enhanced Raman scattering （SERS） signal. The findings from this study provide the basis for a novel detection technique of low analyte concentration utilizing the high SERS response of molecules inside the core/shell metal nanostructures. As an example, we show robust SERS detection of thiram fungicide as low as 10-9 m in solutions.

关键词： surface-enhanced Ramanscattering (SERS) Au@Ag nanorods nanocuboids multipole plasmons

Capacitance,charge dynamics,and electrolyte-surface interactions in functionalized carbide-derived carbon electrodes

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Progress in Natural Science:materials International 2015年第6期25卷 631-641页

作者： boris Dyatkin Eugene mamontov Kevin m.Cook Yury Gogotsi Department of materials Science & Engineering and A.J.Drexel Nanomaterials Institute Drexel University Spallation Neutron Source Oak Ridge National Laboratory materials Engineering Division Naval Air Systems Command

This study analyzed the dynamics of ionic liquid electrolyte inside of defunctionalized,hydrogenated,and aminated pores of carbide-derived carbon supercapacitor *** approach tailors surface functionalities and tunes nanoporous structures to decouple the influence of pore wall composition on capacitance,ionic resistance,and long-term ***-elastic neutron scattering probes the self-diffusion properties and electrode-ion interactions of electrolyte molecules confined in functionalized ***-temperature ionic liquid interactions in confined pores are strongest when the hydrogen-containing groups are present on the *** property translates into higher capacitance and greater ion transport through pores during electrochemical *** hydrogenated pores,aminated pores do not favorably interact with ionic liquid ions and,subsequently,are outperformed by defunctionalized surfaces.

关键词： Supercapacitor Carbide-derived carbon Neutron scattering Energy storage Porous materials Surface chemistry

mechanism of the Initial Stage of Thermal Decomposition of Nitroguanidine

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火炸药学报 2023年第1期46卷 31-40页

作者： boris E.Krisyuk Danila A.markin Timofey m.Sypko Viktor V.Zakharov Nikita V.Chukanov boris L.Korsunskiy Federal Research Center of Problems of Chemical Physics and medicinal Chemistry Russian Academy of Sciences142432prosp.Academician Semenov1ChernogolovkaMoscow RegionRussia Plekhanov Russian University of Economics Department of Chemistry and Physics36 Stremyanny laneMoscow 117997Russia Lomonosov moscow State University Faculty of Fundamental Physical and Chemical engineeringGSP-11 Leninskie Goryp.51Moscow 119991Russia N.N.Semenov Federal Research Center for Chemical Physics Russian Academy of Science 4 Kosygina StreetBuilding 1Moscow 119991Russia

A theoretical and experimental study of the thermal decomposition of nitroguanidine(NQ) has been carried out. Various thermolysis channels were studied by quantum chemistry methods at the CCSD(or DLPNO-CCSD) level using the aug-cc-pVDZ basis set. It is shown that the lowest activation enthalpies(170-180kJ/mol) are characteristic of the reactions of NO2abstraction from the initial NQ and the reaction channel with the transfer of oxygen from the nitro group to carbon in the limiting stage. Additionally, the thermolysis of NQ was studied experimentally in a nonisothermal mode with heating rates from 1 to 10K/min. In these experiments, the weight loss of the sample, thermal effects, and mass spectra of the products were recorded. An analysis of the experimental data confirmed the results of a theoretical study of the mechanism of thermal decomposition of NQ. The main thermolysis products are N2O, HNCO, NH3, and NO2, which fully corresponds to quantum chemical calculations.

关键词： primary thermolysis steps quantum-chemical calculation mass spectrometry DSC TG

Post-Late Paleozoic Collisional Framework of Southern Great Altai

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Acta Geologica Sinica(English Edition) 2012年第5期86卷 1093-1104页

作者： boris m. CHIKOV Sergei V. ZINOVIEV Еugene V. DEYEV Institute of Geology Siberian Branch of Russian Academy of Sciences Novosibirsk 630090 Russia

We outline the post-Late Paleozoic （latest Permian to Cenozoic） collisional framework of the southern Great Altai （Central Asia） produced by the convergence between the Tuva-mongolia and Junggar continental terranes （microplates）. The collisional structures in the region classified on the basis of their geometry and deformation style, dynamic metamorphism, and compositions of tectonites are of three main types：（1） mosaic terranes made up of large weakly deformed Paleozoic blocks separated by younger shear zones; （2） contractional deformation systems involving structures formed in post-Late Paleozoic time, parallel faults oriented along collisional deformation systems, and relict lenses of Paleozoic orogenic complexes; and （3） isolated zones of dynamic metamorphism composed mostly of collisional tectonites different in composition and alteration grade.

关键词： continental collision post-Late Paleozoic events tectonic framework dynamic metamorphism Altai Central Asia

Interface-induced warping in hybrid two-dimensional materials

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Nano Research 2015年第6期8卷 2015-2023页

作者： John m. Aired Zhuhua Zhang Zhili Hu boris I. Yakobson Department of material Science and Nanoengineering Rice University Houston Texas 77005 USA

Two-dimensional hybrid materials consisting of heterogeneous domains have been of great interest. Using empirical molecular dynamical simulation, we show that the morphology of such hybrid 2D materials can extend into the third dimension via strong warping intrinsic to the interfaces between the domains. The interface warping stems from the compressive stress in the domain with a larger lattice constant and even penetrates into the stretched domain. Based on classic plate theory, we analytically quantify the amplitude, wave length and penetration depth of the interface warping as functions of the lattice mismatch, achieving good agreement with the simulations. moreover, we propose that periodically placing pentagon-heptagon dislocations along the interface can eliminate the warping in the 2D material and such defective interface can be more favorable than the warped one over a critical domain size, which is consistent with recent experimental observations. Our results suggest that the interface warping in 2D hybrid materials should be considered in further exploring their promising properties.

关键词： graphene interface rippling mechanical property hybrid 2D materials

Integrating geographical information in the Linked Digital Earth

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International Journal of Digital Earth 2014年第7期7卷 554-575页

作者： Luis m.Vilches-Blazquez boris Villazon-Terrazas Oscar Corcho Asuncion Gomez-Perez Ontology Engineering Group Departamento de Inteligencia ArtificialFacultad de InformaticaUniversidad Politecnica de MadridMadridSpain

many progresses have been made since the Digital Earth notion was envisioned thirteen years ***,the mechanism for integrating geographic informa-tion into the Digital Earth is still quite *** this context,we have developed a process to generate,integrate and publish geospatial Linked Data from several Spanish National *** data-sets are related to four Infrastructure for Spatial Information in the European Community(INSPIRE)themes,specifically with Administrative units,Hydrography,Statistical units,and *** main goal is to combine different sources(heterogeneous,multidisciplinary,multitemporal,multiresolution,and multilingual)using Linked Data *** goal allows the overcoming of current problems of information integration and driving geographical information toward the next decade scenario,that is,‘Linked Digital Earth’.

关键词： geographical information integration Digital Earth Linked Data

A case of severe refractive changes induced by Galyfilcon A silicone hydrogel contact lenses

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International Journal of Ophthalmology(English edition) 2016年第1期9卷 175-177页

作者： boris Severinsky New England College of Optometry Boston 02115 USA

Dear Sir, I＇m boris Severinsky from the New England College of Optometry, Boston, USA. I write you to present an interesting case of extreme refractive and corneal topography changes induced by daily wearing of Acuv... 详细信息

关键词： A case of severe refractive changes induced by Galyfilcon A silicone hydrogel contact lenses case Vision Figure

Plague reservoir species throughout the world

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Integrative Zoology 2021年第6期16卷 820-833页

作者： Ahmad mAHmOUDI boris KRYŠTUFEK Alexander SLUDSKY boris V.SCHmID Alzira m.P.DE ALmEIDA Xu LEI Beza RAmASINDRAZANA Eric BERTHERAT Aidyn YESZHANOV Nils ChrSTENSETH Ehsan mOSTAFAVI Department of Biology Faculty of ScienceUrmia UniversityIran Department of Epidemiology and Biostatistics Research Centre for Emerging and Reemerging Infectious DiseasesPasteur Institute of IranTehranIran Slovenian museum of Natural History LjubljanaSlovenia Russian Research Anti-Plague Institute«microbe» SaratovRussian Federation Centre for Ecological and Evolutionary Synthesis(CEES) Department of BiosciencesUniversity of OsloOsloNorway National Reference Laboratory for Plague Fiocruz PERecifePEBrazil State Key Laboratory of Integrated management on Pest Insects and Rodents Institute of ZoologyChinese Academy of SciencesBeijingChina Plague Unit Institut Pasteur de MadagascarMadagascar Department of Infectious Hazard management Health Emergencies ProgrammeWHOGenevaSwitzerland m.Aikimbaev’s National Scientific Center for Especially Dangerous Infections AlmatyKazakhstan National Reference Laboratory for Plague Tularemia and Q feverResearch Centre for Emerging and Reemerging Infectious DiseasesPasteur Institute of IranAkanluKabudar AhangHamadanIran

Plague has been known since ancient times as a re-emerging infectious disease,causing considerable socioeconomic burden in regional *** better understand the epidemiological cycle of the causative agent of the plague,its potential occurrence,and possible future dispersion,one must carefully consider the taxonomy,distribution,and ecological requirements of reservoir-species in relation either to natural or human-driven changes(*** change or urbanization).In recent years,the depth of knowledge on species taxonomy and species composition in different landscapes has undergone a dramatic expansion,driven by modern taxonomic methods such as synthetic surveys that take into consideration morphology,genetics,and the ecological setting of captured animals to establish their species ***,we consider the recent taxonomic changes of the rodent species in known plague reservoirs and detail their distribution across the world,with a particular focus on those rodents considered to be keystone host species.A complete checklist of all known plague-infectable vertebrates living in plague foci is provided as a Supporting Information table.

关键词： mammals plague reservoirs rodents taxonomy

Geoacoustic Inversion Using Time Reversal of Ocean Noise

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Chinese Physics Letters 2017年第9期34卷 62-65页

作者： Ji-Xing Qin boris Katsnelson Oleg Godin Zheng-Lin Li State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100190 Department of marine Geosciences School of Marine SciencesUniversity of HaifaHaifa 31905Israel Cooperative Institute for Research in Environmentm Sciences University of Colorado BoulderColorado 80309 USA

We present a passive geoacoustic inversion method using two hydrophones, which combines noise interferometry and time reversal mirror （TRm） techniques. Numerical simulations are firstly performed, in which strong fo- cusing occurs in the vicinity of one hydrophone when Green＇s function （GF） is back-propagated from the other hydrophone, with the position and strength of the focus being sensitive to sound speed and density in the bottom. We next extract the GF from the noise cross-correlation function measured by two hydrophones with 8025-m distance in the Shallow Water ＇06 experiment. After realizing the TRm process, sound speed and density in the bottom are inverted by optimizing focusing of the back-propagated GF. The passive inversion method is inherently environmentally friendly and low-cost.

关键词： Geoacoustic Inversion Using Time Reversal of Ocean Noise GF