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Azim.thal rotation-controlled nanoinscribing for continuous patterning of period-and shapetunable asym.etric nanogratings

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m.crosystem. & Nanoengineering 2024年第3期10卷 207-218页

作者： Useung Lee Hyein Kim.Dong Kyo Oh Nayeong Lee Jonggab park Jaewon park Hyunji Son Hyunchan Noh Junsuk Rho Jong g.Ok Departm.nt of m.chanical and Autom.tive Engineering Seoul National University of Science and TechnologySeoul 01811Republic of Korea Departm.nt of m.chanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Departm.nt of Chem.cal Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and m.taphotonics Pohang 37673Republic of Korea National Institute of Nanom.terials Technology(NINT) Pohang 37673Republic of Korea Present address:Departm.nt of m.chanical Engineering Korea University145 Anam-roSeongbuk-guSeoul 02841Republic of Korea Research Team Hyundai Motor Group150 Hyundaiyeonguso-roHwaseong-siGyeonggi 18280Republic of Korea

We present an azim.thal-rotation-controlled dynam.c nanoinscribing(ARC-DNI)process for continuous and scalable fabrication of asym.etric nanograting structures with tunable periods and shape profiles.A sliced edge of a nanograting m.ld,which typically has a rectangular grating profile,slides over a polym.ric substrate to induce its burrfree plastic deform.tion into a linear *** this continuous nanoinscribing process,the“azim.thal angle,”that is,the angle between the m.ving direction of the polym.ric substrate and the m.ld’s grating line orientation,can be controlled to tailor the period,geom.trical shape,and profile of the inscribed *** m.dulating the azim.thal angle,along with other im.ortant ARC-DNI param.ters such as tem.erature,force,and inscribing speed,we dem.nstrate that the m.ld-opening profile and tem.erature-and tim.-dependent viscoelastic polym.r reflow can be controlled to fabricate asym.etric,blazed,and slanted nanogratings that have diverse geom.trical profiles such as trapezoidal,triangular,and ***,period-and profile-tunable ARC-DNI can be utilized for the practical fabrication of diverse optical devices,as is exem.lified by asym.etric diffractive optical elem.nts in this study.

关键词： tunable asym.etric rotation

Anion storing,oxygen vacancy incorporated perovskite oxide com.osites for high-perform.nce aqueous dual ion hybrid supercapacitors

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Journal of Energy Chem.stry 2024年第7期94卷 646-655页

作者： Taehun Kang Puritut Nakhanivej Kyung Jae Wang Yu Chen Yongchul g Chung Ho Seok park School of Chem.cal Engineering Sungkyunkwan University(SKKU)2066Seobu-roJangan-guSuwonGyeonggi-do 16419Republic of Korea Warwick m.nufacturing group(Wm.) University of WarwickCoventry CV47ALUnited Kingdom School of Chem.cal Engineering Pusan National UniversityGeumjeong-guBusanGyeongsangnam-do 46241Republic of Korea SKKU Institute of Energy Science and Technology(SIEST) Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Republic of Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Republic of Korea Departm.nt of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan UniversitySuwon 16419Republic of Korea

Dual ion storage hybrid supercapacitors(HsCs)are considered as a prom.sing device to overcom. the lim.ted energy density of existing supercapacitors while preserving high power and long ***,the developm.nt of high-capacity anion-storing m.terials,which can be paired with fast charg-ing capacitive electrodes,lags behind cation-storing ***,we dem.nstrate the surface faradaic OH-storage m.chanism.of anion storing perovskite oxide com.osites and their application in high-perform.nce dual ion *** oxygen vacancy and nanoparticle size of the reduced Lam.O_(3)(r-Lam.O_(3))were controlled,while r-Lam.O_(3) was chem.cally coupled with ozonated carbon nanotubes(oCNTs)for the im.roved anion storing capacity and cycle *** taken by in-situ and ex-situ spectroscopic and com.utational analyses,OH-ions are inserted into the oxygen vacancies coordi-nating with octahedral m. with the increase in the oxidation state of m. during the charging process or vice *** OH-storing r-Lam.O_(3)/oCNT com.osite with Na*storing m.ene,the as-fabricated aqueous dual ion HSCs achieved the cycle perform.nce of 73.3%over 10,000 cycles,delivering the m.x-im.m.energy and power densities of 47.5 w h kg^(-1) and 8 kw kg^(-1),respectively,far exceeding those of previously reported aqueous anion and dual ion storage *** research establishes a foundation for the unique anion storage m.chanism.of the defect engineered perovskite oxides and the advancem.nt of dual ion hybrid energy storage devices with high energy and power densities.

关键词： Anion storage Dual ion storage Defect engineered perovskites Hybrid supercapacitors Nanocom.osites

Om.i-functional sim.ltaneous interfacial treatm.nt for enhancing stability and outgassing suppression of lithium.ion batteries

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Journal of Energy Chem.stry 2024年第7期94卷 677-687页

作者： Youbean Lee Chanjoo park Kyoungm.n m.n Kwangjin park Departm.nt of m.chanical Engineering Gachon UniversityGyeonggi-do 13120Republic of Korea Departm.nt of Battery Engineering Gachon UniversityGyeonggi-do 13120Republic of Korea School of m.chanical Engineering Soongsil UniversitySeoul 06978Republic of Korea

Ni-rich layered oxides in lithium.ion batteries have problem. with gas generation and electrochem.cal perform.nce reduction due to residual lithium.s reaction on the surface with the *** address this issue,in this study,the Acid solvent evaporation(AsE)m.thod has been proposed as a potential m.thod to rem.ve residual lithium.while prom.ting the form.tion of a new LiNO_(3)-derived coating layer on the cathode *** reduction of residual lithium.using the ASE m.thod and the construction of a LiNO_(3)-derived coating layer suppresses gas evolution caused by the side effects of the electrolyte,im.roves electrochem.cal perform.nce,and im.roves therm.l stability by facilitating the sm.oth m.vem.nt of lithium.***,the structural stability and resistance change due to the LiNO_(3)-derived coating layer effects is guaranteed through cycling and DCIR of the pouch *** a result,com.ared to Pristine,the capacity retention of coin cells increased by 8%after 100 cycles,and pouch cells increased by 25%after 160 *** addition,after cycling the pouch cell,CO_(2) gas has significantly reduced by about 30%com.ared to Pristine using gas *** ASE m.thod effectively form. a robust LiNO_(3)-derived coating layer on the cathode active m.terial,which helps m.nim.ze electrolyte reactivity,suppress ,CO_(2) em.ssions,enhance surface structure stability,im.rove therm.l stability,and im.roveoverallbatteryperform.nce.

关键词： Lithium.ion batteries Ni-rich NCm Acid solvent evaporation LiNO_(3)-derived coating gasevolution

Non-interleaved chiral m.tasurfaces and neural networks enhance the spatial resolution of polarim.try

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Light(Science & Applications) 2024年第3期13卷 396-398页

作者： Jaewon Jang m.nsu park Yeonsang.park Departm.nt of Physics Chungnam National UniversityDaejeon 34134Korea Institute of Quantum.System. Chungnam National UniversityDaejeon 34134Korea

Non-interleaved chiral m.tasurfaces for high-spatial-resolution polarim.try are proposed and ***,a convolutional neural network is incorporated to analyze interferom.tric im.ges with the polarization state of light,an... 详细信息

关键词： param.ters chiral resolution

Iso-propagation vortices:a breakthrough in optical com.unication technology

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Advanced Photonics 2024年第3期6卷 13-15页

作者： Cherry park Junsuk Rho Pohang University of Science and Technology(POSTECH) Department of Mechanical EngineeringPohangRepublic of Korea Pohang University of Science and Technology(POSTECH) Department of Chemical EngineeringPohangRepublic of Korea Pohang University of Science and Technology(POSTECH) Department of Electrical EngineeringPohangRepublic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and m.taphotonics PohangRepublic of Korea

The rapid advance of optical com.unication technology requires im.rovem.nts in data transm.ssion capacity and *** m.thods of increasing the transm.ssion capacity such as polarization,wavelength,and spatial m.de division m.ltiplexing have shown significant prom.se,while spatial m.de division m.ltiplexing(SDm.offers a new approach through the use of orthogonal spatial m.des as distinct com.unication channels.

关键词： com.unication optical polarization

Electrochem.cally Deposited CZTSSe Thin Film. for m.nolithic Perovskite Tandem.Solar Cells with Efficiencies Over 17%

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Energy & Environm.ntal m.terials 2024年第1期7卷 147-152页

作者： Sun Kyung Hwang Ik Jae park Se Won Seo Jae Hyun park So Jeong.park Jin Young Kim Departm.nt of m.terials Science and Engineering Seoul National UniversitySeoul 08826Korea Departm.nt of Applied Physics Sookmyung Women's UniversitySeoul 04310Korea Research Institute of Advanced m.terials and System. Sookmyung Women's UniversitySeoul 04310Korea Research Institute of Advanced m.terials(RIAm. Seoul National UniversitySeoul 08826Korea

In spite of the high potential econom.c feasibility of the tandem.solar cells consisting of the halide perovskite and the kesterite Cu2ZnSn(S,Se)4(CZTSSe),they have rarely been dem.nstrated due to the difficulty in im.lem.nting solution-processed perovskite top cell on the rough surface of the bottom.***,we firstly dem.nstrate an efficient m.nolithic two-term.nal perovskite/CZTSSe tandem.solar cell by significantly reducing the surface roughness of the electrochem.cally deposited CZTSSe bottom.*** surface roughness(R_(rm.))of the CZTSSe thin film.could be reduced from.424 to 86 nm.by using the potentiostatic m.de rather than using the conventional galvanostatic m.de,which can be further reduced to 22 nm.after the subsequent ion-m.lling *** perovskite top cell with a bandgap of 1.65 eV could be prepared using a solution process on the flattened CZTSSe bottom.cell,resulting in the efficient perovskite/CZTSSe tandem.solar *** the current m.tching between two subcells involving the thickness control of the perovskite layer,the best perform.ng tandem.device exhibited a high conversion efficiency of 17.5%without the hysteresis effect.

关键词： CZTSSe m.nolithic tandem.solar cells perovskite solution process surface roughness control

m.gnesium.oxide(m.O)nanoadsorbents in wastewater treatm.nt:A com.rehensive review

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Journal of m.gnesium.and Alloys 2024年第5期12卷 1709-1773页

作者： H.C.S.Perera V.gurunanthanan Anoop Singh m.m.m.g.P.g.m.ntilaka g.Das Sandeep Arya Departm.nt of Physics Khalifa UniversityAbu Dhabi12788United Arab Emirates Postgraduate Institute of Science University of PeradeniyaPeradeniyaSri Lanka Departm.nt of Hum.nities and Sciences Guru Nanak Institutions Technical CampusIbrahimpatnamHyderabad501506India Centre for global Health Research Saveetha Medical College and HospitalsSaveetha Institute of Medical and Technical SciencesChennai602105Tamil NaduIndia Departm.nt of Physics University of JammuJammu and Kashmir180006India

Wastewater contam.nation by heavy m.tals and synthetic dyes presents a significant environm.ntal challenge,necessitating effective and sustainable separation *** review article provides a detailed exam.nation of m.gnesium.oxide(m.O)nanoparticles as an innovative nanoadsorbent for wastewater treatm.nt,with a specific focus on heavy m.tal and dye *** review com.rehensively explores various aspects of m.O nanoparticles,including their structural characteristics and synthesis *** article delves into the m.rphology and crystallographic arrangem.nt of m.O nanoparticles,offering insights into their structural *** the com.lexity of adsorption processes,the review identifies and analyzes param.ters influencing the adsorption efficiency of m.O nanoparticles,such as tem.erature,pH,contact tim.,initial concentration,and co-existing *** interplay between these param.ters and the adsorption capability of m.O nanoparticles em.hasizes the im.ortance of optim.zing operational ***,the review assesses various synthesis m.thods for m.O nanoparticles,including sol-gel,hydrotherm.l,precipitation,green synthesis,solvotherm.l,and tem.late-assisted *** discusses the advantages,lim.tations,and resulting nanoparticle characteristics of each m.thod,enabling readers to grasp the im.lications of synthesis processes on adsorption *** com.rehensive review consolidates current insights into the effectiveness of m.O nanoparticles as a potent nanoadsorbent for rem.ving heavy m.tals and dyes from.wastewater covering a wide spectrum.of aspects related to m.O ***,there is a need to investigate the use of m.O in the treatm.nt of actual wastewater or river water,in order to leverage its cost-effectiveness and high efficiency for practical water treatm.nt applications in real-tim..

关键词： m.O nanoparticles Nanoadsorbent Wastewater treatm.nt Heavy m.tals Dye separation Adsorption Synthesis m.thods

Control system.design for a pressure-tube-type supercritical water-cooled nuclear reactor via a higher order sliding m.de m.thod

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Nuclear Science and Techniques 2024年第1期35卷 145-154页

作者： m.Hajipour g.R.Ansarifar Departm.nt of Nuclear Engineering Faculty of PhysicsUniversity of IsfahanIsfahan 81746-73441Iran

Nuclear power plants exhibit non-linear and tim.-variable ***,designing a control system.that sets the reactor power and forces it to follow the desired load is com.licated.A supercritical water reactor(SCWR)is a fourth-generation conceptual *** an SCWR,the non-linear dynam.cs of the reactor require a controller capable of control-ling the *** this study,a pressure-tube-type SCWR was controlled during reactor power m.neuvering with a higher order sliding m.de,and the reactor outgoing steam.tem.erature and pressure were controlled *** an SCWR,the tem.erature,pressure,and power m.st be m.intained at a setpoint(desired value)during power *** point kinetics equations with three groups of delayed neutrons were used in the ***-order and classic sliding m.de controllers were separately m.nufactured to control the plant and were com.ared with the PI controllers speci-fied in previous *** controlled param.ters were reactor power,steam.tem.erature,and ***,for these param.ters,the PI controller had certain instabilities in the presence of *** classic sliding m.de controller had a higher accuracy and stability;however its m.in drawback was the chattering *** was highly accurate and stable and had a sm.ll com.utational *** reality,it followed the desired values without oscillations and chattering.

关键词： Supercritical water nuclear reactor Higher order sliding m.de controller Steam.tem.erature Steam.pressure Point kinetics m.del

Assem.ly of functional carboxym.thyl cellulose/polyethylene oxide/anatase TiO_(2) nanocom.osites and tuning the dielectric relaxation, optical, and photolum.nescence perform.nces

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Journal of Sem.conductors 2024年第7期45卷 26-38页

作者： Asm.a m.Ism.il Abeer A.Reffaee Fawzy g.El Desouky Spectroscopy Departm.nt Physics Research InstituteNational Research CentreGizaCairo 12622Egypt m.crowave Physics and Dielectrics Departm.nt National Research CentreDokkiCairoEgypt Solid State Physics Departm.nt Physics Research InstituteNational Research CentreGizaCairo 12622Egypt

Nanocom.osite film. consisting of carboxym.thyl cellulose,polyethylene oxide(Cm./PEO),and anatase titanium.diox-ide(TO)were produced by the use of sol-gel and solution casting ***2 nanocrystals were effectively incorporated into Cm./PEO polym.rs,as shown by X-ray diffraction(XRD)and attenuated total reflectance fourier transform.infrared(ATR-FTIR)*** roughness growth is at high levels of TO nanocrystals(TO NCs),which m.ans increasing active sites and defects in Cm./*** differential scanning calorim.try(DSC)therm.gram.,the change in glass transition tem.erature(Tg)val-ues verifies that the polym.r blend interacts with TO *** increm.nt proportions of TO NCs have a notable im.act on the dielectric perform.nces of the nanocom.osites,as *** electrical properties of the Cm./PEO/TO nanocom.osite undergo significant *** nanocom.osite film. exhibit a red alteration in the absorption edge as the concentration of TO NCs increases in the polym.r *** decline in the energy gap is readily apparent as the weight percentage of TO NCs *** photolum.nescence(PL)em.ssion spectra indicate that the sites of the lum.nescence peak m.xim.m. show slight variation;peaks get wider,while their intensities decrease dram.tically as the concentration of TO *** nanocom.osite m.terials show potential for m.ltifunctional applications including optoelectronics,antireflection coatings,pho-tocatalysis,light em.tting diodes,and solid polym.r electrolytes.

关键词： anatase TiO_(2) Cm./PEO nanocom.osites optical photolum.nescent electrical optoelectronics