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Experimental Study of Liquid Metal Flow for the Development of a Contact-Less Control Technique

Fluid Dynamics & Materials Processing 2024年第7期20卷 1553-1564页

作者： Aleksandr Poluyanov Ilya Kolesnichenko Laboratory of Technological Hydrodynamics Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science(ICMM UB RAS)Perm614018Russia

The article presents an experimental study on the flow of an eutectic gallium alloy in a cylindrical cell,which is placed in an alternating magnetic *** magnetic field is generated by a coil connected to an alternating current *** coil is located at a fixed height in such a way that its plane is perpendicular to the gravity vector,which in turn is parallel to the axis of the *** position of the cylinder can vary in height with respect to the *** forced flow of the considered electrically conductive liquid is generated due to the action of the localized electromagnetic *** is assumed that under the action of the alternating magnetic field,the liquid is heated uniformly,and the resulting heat is quickly absorbed by the forced flow,so that liquid free convection can be *** experiment is carried out using an ultrasonic Doppler *** transducer is installed in the axially located cylinder sluice and the other transducer is placed in the near-wall *** to the results,a velocity profile,corresponding to a two-tori flow pattern can be hardly obtained in the low frequency range of the power ***,this is possible in the high frequency *** average velocity profiles depend essentially on the location of the coil relative to the *** spectral analysis of velocity signals shows that the amplitude of the velocity pulsations is comparable to the average value of the flow *** experimental results and their verification through comparison with numerical calculations are intended to support the development of new methods for reducing the intensity of vortex flows during the electromagnetic separation of impurities through an electromagnetic induction mechanism(able to produce an electromotive force that displaces particles).

关键词： Ultrasonic doppler velocimeter electrically conductive medium azimuthal pinch experiment in liquid metal magnetohydrodynamics

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A realistic topological p-n junction at the Bi2Se3 （0001） surface based on planar twin boundary defects

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Nano Research 2017年第5期10卷 1784-1793页

作者： Hugo Aramberri M. Carmen Munoz Jorge I. Cerda Instituto de Ciencia de Materiales de Madrid (icmm-CSIC) Cantoblanco Madrid 28049 Spain

We propose a realistic topological p-n junction （TPNJ） by matching two Bi2Se3 （0001） slabs with opposite arrangements of planar twin boundary defects. The atomistic modeling of such a device leads to dislocation defects in the hexagonal lattice in several quintuple layers. Nevertheless, total energy calculations reveal that the interface relaxes, yielding a smooth geometrical transition that preserves the nearest-neighbors fcc-type geometry throughout these defect layers. The electronic, magnetic, and transport properties of the junction have then been calculated at the ab initio level under open boundary conditions, i.e., employing a thin-film geometry that is infinite along the electron transport direction. Indeed, a p-n junction is obtained with a built-in potential as large as 350 meV. The calculations further reveal the spin texture across the interface with unprecedented detail. As the main result, we obtain non-negligible transmission probabilities around the F point, which involve an electron spin-flip process while crossing the interface.

关键词： topological insulators p-n junctions spintronics electronic devices twin boundaries

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Low-Cost and Biodegradable Thermoelectric Devices Based on van der Waals Semiconductors on Paper Substrates

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Energy & Environmental Materials 2024年第1期7卷 201-206页

作者： Gulsum Ersu Carmen Munuera Federico J.Mompean Daniel Vaquero Jorge Quereda João Elias F.S.Rodrigues Jose A.Alonso Eduardo Flores Jose R.Ares Isabel J.Ferrer Abdullah M.Al-Enizi Ayman Nafady Sruthi Kuriakose Joshua O.Island Andres Castellanos-Gomez Materials Science Factory Instituto de Ciencia de Materiales de Madrid(ICMM-CSIC)Madrid E-28049Spain Nanotechnology Group USAL-NanolabUnivesidad de SalamancaSalamanca Junta de Castilla y León 37007Spain GISC Departamento de Física de MaterialesUniversidad Complutense de MadridMadrid E-28040Spain Departamento de Física Aplicada Centro de Investigación y Estudios AvanzadosMérida 97310Mexico MIRE Group Departamento de Física de MaterialesUniversidad Autónoma de MadridMadrid E-28049Spain Instituto Nicolás Cabrera Universidad Autónoma de MadridMadrid E-28049Spain Department of Chemistry College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Department of Physics and Astronomy University of Nevada Las VegasLas Vegas NV 89154USA

We present a method to fabricate handcrafted thermoelectric devices on standard office paper *** devices are based on thin films of WS_(2),Te,and BP(P-type semiconductors)and TiS_(3)and TiS_(2)(N-type semiconductors),deposited by simply rubbing powder of these materials against *** thermoelectric properties of these semiconducting films revealed maximum Seebeck coefficients of(+1.32±0.27)mV K^(-1)and(-0.82±0.15)mV K^(-1)for WS_(2)and TiS_(3),***,Peltier elements were fabricated by interconnecting the P-and N-type films with graphite electrodes.A thermopower value up to 6.11 mV K^(-1)was obtained when the Peltier element were constructed with three *** findings of this work show proof-of-concept devices to illustrate the potential application of semiconducting van der Waals materials in future thermoelectric power generation as well as temperature sensing for low-cost disposable electronic devices.

关键词： paper-based electronics Seebeck effect semiconductors thermoelectrics van der Waals materials

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Biaxial versus uniaxial strain tuning of single-layer MoS_(2)

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Nano Materials Science 2022年第1期4卷 44-51页

作者： Felix Carrascoso Riccardo Frisenda Andres Castellanos-Gomez Materials Science Factory Instituto de Ciencia de Materiales de Madrid(ICMM-CSIC)28049Madrid Spain

Strain engineering has arisen as a powerful technique to tune the electronic and optical properties of twod imensional semiconductors like molybdenum disulfide(MoS_(2)).Although several theoretical works predicted that biaxial strain would be more effective than uniaxial strain to tune the band structure of MoS_(2),a direct experimental verification is still missing in the *** we implemented a simple experimental setup that allows to apply biaxial strain through the bending of a cruciform polymer *** used the setup to study the effect of biaxial strain on the differential reflectance spectra of 12 single-layer MoS_(2)flakes finding a redshift of the excitonic features at a rate between-40 meV/%and-110 meV/%of biaxial *** also directly compare the effect of biaxi al and uniaxial strain on the same single-layer MoS_(2)finding that the biaxial strain gauge factor is 2.3 times larger than the uniaxial strain one.

关键词： finding layer gauge

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Chemically modified STM tips for atomic-resolution imaging of ultrathin NaCI films

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Nano Research 2015年第7期8卷 2223-2230页

作者： Zhe Li Koen Schouteden Violeta lancu Ewald Janssens Peter Lievens Chris Van Haesendonck Jorge I. Cerda Solid-State Physics and Magnetism Section KU Leuven BE-3001 Leuven Belgium Instituto de Ciencia de Materiales ICMM-CSIC Cantoblanco 28049 Madrid Spain

Cl-functionalized scanning tunneling microscopy （STM） tips are fabricated by modifying a tungsten STM tip in situ on islands of ultrathin NaCI（100） films on Au（111） surfaces. The functionalized tips are used to achieve clear atomic- resolution imaging of NaCI（100） islands. In comparison with bare metal tips, the chemically modified tips yield drastically enhanced spatial resolution as well as contrast reversal in STM topographs, implying that Na atoms, rather than C1 atoms, are imaged as protrusions. STM simulations based on a Green＇s function formalism reveal that the experimentally observed contrast reversal in the STM topographs is due to the highly localized character of the Cl-pz states at the tip apex. An additional remarkable characteristic of the modified tips is that in dI/dV maps, a Na atom appears as a ring with a diameter that depends crucially on the tip-sample distance.

关键词： scanning tunneling microscopy(STM)ultrathin insulating films functionalized stm-tip sm simulation

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An approach to determination of shunt circuits parameters for damping vibrations

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International Journal of Smart and Nano Materials 2018年第2期9卷 135-149,I0005页

作者： V.P.Matveenko N.A.Iurlova D.A.Oshmarin N.V.Sevodina M.A.Iurlov Department of complex problems of deformable solids mechanics Institute of Continuous Media Mechanics of the Ural Branch of RAS(ICMM UB RAS)PermRussian Federation

This paper considers the problem of natural vibrations of a deformable structure containing elements made of *** piezoelectric elements are connected through electrodes to an external electric circuit,which consists of resistive,inductive and capacitive *** on the solution of this problem,the parameters of external electric circuits are searched for to allow optimal passive control of the structural *** solution to the problem is complex natural vibration frequencies,the real part of which corresponds to the circular eigenfrequency of vibrations and the imaginary part corresponds to its damping rate(damping ratio).The analysis of behaviour of the imaginary parts of complex eigenfrequencies in the space of external circuit parameters allows one to damp given modes of structure *** effectiveness of the proposed approach is demonstrated using a cantilever-clamped plate and a shell structure in the form of a semi-cylinder connected to series resonant RL circuits.

关键词： Electoelasticity piezoelectric element shunt circuits damping natural vibrations numerical modeling

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Stepwise magnetization reversal of geometrically tuned in diameter Ni and FeCo bi-segmented nanowire arrays

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Nano Research 2019年第7期12卷 1547-1553页

作者： Ester M. Palmero Miguel Mendez Silvia Gonzalez Cristina Bran Victor Vega Manuel Vazquez Victor M. Prida Institute of Materials Science of Madrid (icmm-CSIC) Madrid 28049Spain Department of Physics University of OviedoFederico Garda Lorca 18Oviedo 33007Spain Division of Permanent Magnets and Applications IMDEA NanoscienceMadrid 28049Spain

Magnetization reversal processes of hexagonal dense arrays of bi-segmented Ni and Fe50Co50 nanowires consisting of two well defined diameters (45 and 80 nm) have been *** nanowires were grown inside of tailored pores of anodic alumina templates by combined anodization,atomic layer deposition (ALD) and electrodeposition *** experiments have allowed to identify their two-step magnetization reversal process ascribed to the respective segments of different *** is concluded from the differential susceptibility observed in the hysteresis loops,contrary to those for nanowires with homogeneous *** results are also confirmed by the first-order reversal curve (FORC) distribution diagrams,where an elongation parallel to the interaction axis around two coercive field values is obtained,which is correlated to the difference in diameter of the two *** well-defined two-step magnetization reversal process through the nanowire diameter design is thought to be very useful for the advanced control of the remagnetization in arrays of magnetic multidomain systems.

关键词： Bi-segmented nanowires nickel iron cobalt alloy stepwise magnetization reversal first-order reversal curve (FORC)

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Non-locality and collective emission in disordered lasing resonators

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Light(Science & Applications) 2013年第1期2卷 79-84页

作者： Marco Leonetti Claudio Conti Cefe Lopez ISC-CNR UOS Sapienza00185 RomaItaly Institute for Material Science Madrid(icmm-CSIC) 28049 MadridSpain Department of Physics University SapienzaI-00185 RomaItaly

Random lasing is observed in optically active resonators in the presence of *** the optical cavities involved are open,the modes are coupled,and energy may pour from one state to another provided that they are spatially *** the electromagnetic modes are spatially localized,our system may be actively switched to a collective state,presenting a novel form of non-locality revealed by a high degree of spectral correlation between the light emissions collected at distant *** a nutshell,light may be stored in a disordered nonlinear structure in different fashions that strongly differ in their spatial *** effect is experimentally demonstrated and theoretically explained in titania clusters embedded in a dye,and it provides clear evidence of a transition to a multimodal collective emission involving the entire spatial extent of the disordered *** results can be used to develop a novel type of miniaturized,actively controlled all-optical chip.

关键词： collective emission disorder nanophotonics random lasing

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Temperature and strain registration by fibre-optic strain sensor in the polymer composite materials manufacturing

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International Journal of Smart and Nano Materials 2018年第2期9卷 99-110,I0003页

作者： V.P.Matveenko N.A.Kosheleva I.N.Shardakov A.A.Voronkov Department of complex problems of deformable solids mechanics Institute of Continuous Media Mechanics of the Ural Branch of RAS(ICMM UB RAS)PermRussian Federation Scientific&Educational Center for Aviation Composite Technologies Perm National Research Polytechnic University(PNRPU)PermRussian Federation

The presence of process-induced strains induced by various manufacturing and operational factors is one of the characteristics of polymer composite materials(PCM).Conventional methods of registration and evaluation of process-induced strains can be laborious,time-consuming and demanding in terms of technical *** employment of embedded fibre-optic strain sensors(FOSS)offers a real prospect of measuring residual *** paper demonstrates the potential for using embedded FOSS for recording technological strains in a PCM *** PCM plate is manufactured from prepreg,using the direct compression-moulding *** this method,the prepared reinforcing package is placed inside a mould,heated,and then exposed to compaction *** examined technology can be used for positioning FOSS between the layers of the composite ***-optic sensors,interacting with the material of the examined object,make it possible to register the evolution of the strain process during all stages of polymer-composite *** data were recorded with interrogator ASTRO X *** obtained data were processed using specially developed algorithms.

关键词： Polymer composite materials fibre-optic strain sensors process-induced strains smart-materials

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外应力对铁基非晶丝的环向磁化过程和涡流损耗的影响

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科技通报 2010年第4期26卷 482-485,488页

作者：尹世忠李印峰 M.Vazquez 邢台学院物理系河北邢台054054 icmm CSICCantoblancomadridspain28049

采用阻抗测量法测量了Fe73.5Cu1Nb3Si13.5B9非晶丝退火(500℃处理1h)样品在外应力作用下的环向磁导率随环向磁场(Hφ=0.15-200 A/m)和频率(f=1-100 kHz)的变化关系。研究了外应力(σ=0-144MPa)对环向磁化和低频下的涡流损耗的影响。结... 详细信息

采用阻抗测量法测量了Fe73.5Cu1Nb3Si13.5B9非晶丝退火(500℃处理1h)样品在外应力作用下的环向磁导率随环向磁场(Hφ=0.15-200 A/m)和频率(f=1-100 kHz)的变化关系。研究了外应力(σ=0-144MPa)对环向磁化和低频下的涡流损耗的影响。结果表明,随着外应力的增大,环向磁化的矫顽力场和畴壁的脱钉扎场增大,而直流环向磁导率和涡流损耗反常因子减小。利用应力感生磁弹性各向异性模型对实验结果进行了讨论。

关键词：非晶丝环向磁导率张应力涡流损耗反常因子

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