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structural effects induced by dialysis-based purification of carbon nanomaterials

Nano Materials science 2024年第4期6卷 475-483页

作者： A.D.veloso A.M.Ferraria A.M.Botelho do rego A.s.viana A.J.s.Fernandes A.J.Fielding r.A.videira M.C.Oliveira CQ-vr and Chemistry Department University of Trás-os-Montes e Alto Douro BsIrG iBB-Institute for Bioengineering and BiosciencesDepartment of Chemical Engineeringand Associate Laboratory i4HB-Institute for Health and BioeconomyInstituto Superior TécnicoUniversidade de Lisboa Centro de Química estrutural Institute of Molecular SciencesDepartamento de Química e BioquímicaFaculdade de CiênciasUniversidade de Lisboa I3N and Physics Department University of AveiroCampus de Santiago Faculty of science Pharmacy and Biomolecular SchoolLiverpool John Moores University reQUIMTe/LAQv Laborat orio de FarmacognosiaDepartamento de QuímicaFaculdade de Farm aciaUniversidade do Porto

Dialysis plays a crucial role in the purification of nanomaterials but its impact on the structural properties of carbon nanomaterials was never ***,a carbon-based nanomaterial generated electrochemically in potassium phosphate buffer,was characterized before and after dialysis against pure *** is shown that dialysis affects the size of the carbon domains,structural organization,surface functionalization,oxidation degree of carbon,and grade of ***,dialysis drives the nanomaterial organization from discrete roundish carbon domains,with sizes ranging from 70 to 160 nm,towards linear stacking structures of small nanoparticles （rallel,alcohol and ether （epoxide） surface groups evolve into more oxidized carbon groups （e.g.,ketone and ester groups）.Investigation of the as-prepared nanomaterial by electron paramagnetic resonance （ePr） revealed a resonance signal consistent with carbon-oxygen centred ***,this study brings to light the selective affinity of the carbon nanomaterial under study to capture Na+ions,a property greatly enhanced by the dialysis process,and its high ability to trap oxygen,particularly before *** findings open new perspectives for the application of carbon-based nanomaterials and raise awareness of the importance of structural changes that can occur during the purification of carbon-based nanomaterials.

关键词： Nanocarbon surface functionalization NMr XPs Hydrophilic carbon Paramagnetic

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Ion-conducting Membranes Based on Bacterial Cellulose Nanofibers Modified by Poly(sodium acrylate-co-2-acrylamido-2-methylpropanesulfonic acid)

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Chinese Journal of Polymer science 2024年第3期42卷 333-343,I0007页

作者： elizaveta v.Batishcheva Nikolay N.smirnov Natalya v.Bobrova Maria P.sokolova Michael A.smirnov Institute of Macromolecular Compounds Russian Academy of SciencesBolshoy pr.31Saint Petersburg 199004Russia

Green method for preparation of ion-conducting membranes(ICM) based on bacterial cellulose nanofibers(CNF) modified by a copolymer of sodium acrylate and 2-acrylamido-2-methylpropanesulfonic acid was elaborated. FTIr and NMr data confirmed grafting of polyacrylate onto cellulose surface. Formation of porous structure of the ICM was controlled by seM and AFM. The maximal ionic conductivity of the membranes reaches 1.5 and 3.1 ms·cm^(-1)(60 ℃ and 98% relative humidity) when they are saturated with water or H_2sO_4(1 mol·L^(-1)) electrolyte,respectively. Prepared ICM was tested as a separator in a symmetrical supercapacitor with electrodes based on polyaniline hydrogel. The assembled cell demonstrate ability to operate at high current density up to 100 A·g^(-1) maintaining specific capacitance 165 F·g^(-1). Maximal specific capacitance of 289 F·g^(-1) was achieved at current density 1 A·g^(-1). retaining of 90% of initial capacitance after 10000 of charge-discharge cycles proves high electrochemical stability of prepared ICM.

关键词： Bacterial cellulose Ion conductivity Porous membrane supercapacitor

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Philippine retinoblastoma initiative multi-eye center study 2010-2020

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International Journal of Ophthalmology(english edition) 2024年第1期17卷 144-156页

作者： roland Joseph D.Tan Gary John v.Mercado Patricia e.Cabrera Paulita Pamela P.Astudillo rolando enrique D.Domingo Josept Mari s.Poblete Charmaine Grace M.Cabebe Adriel vincent r.Te Melissa Anne s.Gonzales Jocelyn G.sy Beltran Alexis A.Aclan Jayson T.so Fatima G.regala Kimberley Amanda K.Comia Josemaria M.Castro Mara Augustine s.Galang Aldous Dominic C.Cabanlas Benedicto Juan e.Aguilar Gabrielle s.evangelista Jo Michael Maniwan Andrei P.Martin Calvin Y.Martinez John Alfred H.Lim rena Ivy Bascuna rachel M.Ng Kevin B.Agsaoay Kris Zanna A.Acluba-Arao ellaine rose.v.Apostol Beatriz M.Prieto Department of Ophthalmology and visual sciences Philippine General HospitalManila 1000Philippines Department of Ophthalmology Baguio General Hospital and Medical CenterBaguio City 2600Philippines Department of Ophthalmology Manila Doctors HospitalManila 1000Philippines Department of Ophthalmology Rizal Medical CenterPasig City 1600Philippines Department of Ophthalmology Jose B.Lingad Memorial Regional HospitalPampanga 2000Philippines Department of Ophthalmology Southern Philippines Medical CenterDavao City 8000Philippines Department of Ophthalmology East Avenue Medical CenterQuezon City 1100Philippines Department of Ophthalmology Northern Mindanao Medical CenterCagayan de Oro City 9000Philippines Department of Ophthalmology Cebu Velez General HospitalCebu City 6000Philippines Legazpi eye Center Legazpi City 4500Philippines Department of Ophthalmology Cagayan Valley Medical CenterTuguegarao City 3500Philippines

AIM:To provide a comprehensive and more representative national data on the disease,especially on treatment options and outcomes,and to determine access of retinoblastoma patients from Luzon,visayas and Mindanao to eye care,and determine if access is associated with delay in consultation,staging and ***:Cohort study of retinoblastoma patients seen in eleven institutions located in the three major areas of the Philippines namely Luzon,vizayas and Mindanao from ***:Totally 636 patients,involving 821 eyes,were ***(57%)were from Luzon and were seen in institutions in Luzon(72%).Annually,58±10 new cases were seen with 71%having unilateral *** delay of consultation remained long at 9(3,17)mo,longest in patients with unilateral disease(Pse from the.visayas(Psed on the International retinoblastoma staging system,only 35%of patients had stage 1 while 47%already had extraocular *** was the most common treatment rece.ved by 484 patients while intravenous chemotherapy was rece.ved by *** were 250(39%)patients alive,195(31%)dead,85(13%)abandoned,17(3%)refused and 89(14%)with no ***:This study presents the largest cohort of retinoblastoma patients in the Philippines in terms of patients’and participating institutions’number and geographical location and type of institution(private and public).It also presents more comprehensive data on the treatments used and outcomes(survival,globe salvage,and vision retention rates).Delay in consultation was still long among patients leading to advanced disease stage and lower survival *** increasing capacity to diagnose and manage retinoblastoma in the country,the delay of consultation remains long primarily due to accessibility issues to eye care institutions especially in the.visayas and financial *** delay was still significant that overall survival rate remain low.

关键词： retinoblastoma Philippines clinical profile

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Microstructure， electrochemical， wear and corrosive wear performance of laser-based powder bed fusion(lpbf) and wrought biomedical Ti-6Al-4v alloys

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Transactions of Nonferrous Metals society of China 2024年

作者： A.G.Lekatou B.v.efremenko v.Haoui v.G.efremenko s.emmanouilidou v.I.Zurnadzhy I.Petryshynets Yu.G.Chabak I.I.sili Laboratory of Applied Metallurgy， Department of Materials science and engineering， school of engineering， University of Ioannina Institute of Materials science and Computing， University research Center of Ioannina (UrCI) Pryazovskyi state Technical University， Department of Physics Institute of Materials research of slovak Academy of sciences

Wrought and laser powder bed fusion （LPBF） Ti-6Al-4v specimens were comparatively evaluated， with the objective to determine LPBF Ti-6-4’s suitability for biomedical applications. Testing included nanoindentation， cyclic polarization in simulated body fluid （sBF， 37 ℃ ）， and dry and sBF “Ball-on-Plate” sliding. Wrought Ti-6-4 exhibited a lamellar （α+β） microstructure， whereas LPBF displayed a fine-grained α'-martensite microstructure. LPBF Ti-6-4 demonstrated ～3% higher indentation modulus and ～32% higher hardness， while wrought Ti-6-4 showed ～8% higher plasticity. Both alloys exhibited low corrosion rates (10–5mA/cm2order) and true passivity (10–4mA/cm2order). No localized corrosion was obse.ved in either alloy， except for occasional metastable pitting in the LPBF alloy. However， LPBF Ti-6-4 presented higher corrosion rate and passive current， ascribed to its martensitic structure. During dry sliding， LPBF Ti-6-4 exhibited ～14% lower volume loss compared to wrought Ti-6-4. sliding in sBF increased volume losses for both alloys， with wear resistances nearly equalized， as the advantage of LPBF Ti-6-4 decreased due to more intensive wear-accelerated corrosion induced by the stressed martensite. Overall， the results demonstrate the suitability of LPBF Ti-6Al-4v for biomedical uses.

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Temperature and structure measurements of he.vy-ion-heated diamond using in situ X-ray diagnostics

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Matter and radiation at extremes 2024年第4期9卷 80-89页

作者： J.Lutgert P.Hesselbach M.schorner v.Bagnoud r.Belikov P.Drechsel B.Heuser O.sHumphries P.Katrik B.Lindqvist C.Qu r.redmer D.riley G.schaumann s.schumacher A.Tauschwitz D.varentsov K.Weyrich X.Yu B.Zielbauer Zs.Major P.Neumayer D.Kraus Institut fur Physik Universitat RostockAlbert-Einstein-Str.2318059 RostockGermany GsI Helmholtzzentrum fur schwerionenforschung Planckstr.164291 DarmstadtGermany Institut für Angewandte Physik Goethe-Universität Frankfurt am MainMax-von-Laue-Str.160438 Frankfurt am MainGermany Institut fur Geowissenschaften Goethe-Universitat Frankfurt am MainAltenhoferallee 160438 Frankfurt am MainGermany Helmholtz-Zentrum Dresden-rossendorf Bautzner Landstr.40001328 DresdenGermany european XFeL GmbH Holzkoppel 422869 SchenefeldGermany Centre for Plasma Physics School of Mathematics and PhysicsQueen’s University BelfastUniversity RoadBelfast BT71NNUnited Kingdom Institut für Kernphysik Technische Universität DarmstadtSchlossgartenstr.964289 DarmstadtGermany state Key Laboratory of Nuclear Physics and Technology Institute of Heavy Ion PhysicsPeking UniversityBeijing 100871China Helmholtz Institut Jena Frobelstieg 307743 JenaGermany

We present in situ measurements of spectrally resolved X-ray scattering and X-ray diffraction from monocrystalline diamond samples heatedwith an intense pulse of he.vy *** this way,we determine the samples’heating dynamics and their microscopic and macroscopic structuralintegrity over a timespan of several *** the ratio of elastic to inelastic scattering with state-of-the-art density functionaltheory molecular dynamics simulations allows the inference of average temperatures around 1300 K,in agreement with predictions fromstopping power *** simultaneous diffraction measurements show no hints of any volumetric graphitization of the material,butdo indicate the onset of fracture in the diamond *** experiments pave the way for future studies at the Facility for Antiproton andIon research,where a substantially increased intensity of the he.vy ion beam will be available.

关键词： heated intense structure

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Design of Biologically Active Macromolecular Ligands and Their Luminescent Complexes with Terbium Ions

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Chinese Journal of Polymer science 2024年第5期42卷 604-611,I0007页

作者： Tatiana N.Nekrasova Andrei I.Fischer Natalia A.Nesterova Anatoliy v.Dobrodumov Anzhelika v.Garshinina Olga D.shuvaeva Natalya v.Zakharova evgenii F.Panarin Institute of Macromolecular Compounds Russian Academy of Sciences31 Bolshoy pr.St Petersburg199004Russia smorodintsev research Institute of Influenza Russian Ministry of Health15/17 ul.prof.PopovaSt Petersburg197376Russia

Water-soluble copolymers of p-methacrylamidobenzoic acid(MABA)with neutral comonomers(N-vinylpyrrolidone.vP),N-methyl-N-vinylacetamide(MvAA),N-methacryloyl glucosamine(MAG))and anionic comononer sodium styrene sulfonate(Nass)were synthesized by radical *** interactions between the prepared copolymers and Tb^(3+)ions in aqueous solutions were studied;the significant influence of chemical structure of a comonomer on luminescence intensity of Tb^(3+)complexes with the copolymers was *** luminescence intensity of Tb^(3+)complexes with the copolymers containing N-vinylamide units(vP,MvAA)is three times more intense than that obse.ved for the complexes between Tb^(3+)and MAG-containing *** the case of Nass-containing copolymers,the luminescence intensity is controlled by the.values of binding constants between Tb^(3+)and MABA and the content of MABA units in a *** studied copolymers and their complexes with Tb^(3+)have low cytotoxicity and a pronounced antiviral activity against human respiratory syncytial virus.

关键词： Luminescence Water-soluble copolymers Lanthanide complexes Antiviral activity Cytotoxicity

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enhanced saturation magnetization in La^(3+) doped NiCo ferrites prepared by sol-gel auto-combustion method

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Journal of rare earths 2024年第8期42卷 1546-1554,I0005页

作者： Maddileti Jelli vidyasagar Thopudurthy Krishna reddy C.v. Department of Physics Rayalaseema UniversityKurnoolA.P518007.Iindia Department of Physics Government PolytechnicRayachotiA.P516269India

Lanthanum doped nickel-cobalt nano ferrites with chemical formula Ni_(0.5)Co_(0.5)LaxFe_(2-x)O_(4)(x=0.05,0,10,0.15 and 0,20) were prepared using a simple sol-gel auto combustion *** basic structural properties were determined by X-ray diffraction method and the formation of single phased spinel ferrite was *** crystalline size decreased from 25 to 11 nm and lattice parameter a increases with increase of La *** surface morphology of these ferrites was obse.ved by field-emission scanning electron microscopy(FeseM) and agglomerated irregular grains are obse.ved with increase of the rare earth element La ***-dispersive X-ray spectroscopy(eDX) result confirms the presence of the required *** Fourier transform infrared spectroscopy(FTIr) spectrum indicates the formation of the spinel ferrite structure with M-O *** direct band measurements from ultraviolet-visible spectroscopy(Uv-vis) spectroscopy indicate that the direct band gap decreases from 1.39 to 1.19 ev for x=0.05 to x=0.15,then increases to 1.28 ev for x=*** room temperature magnetic properties of these ferrites were studied by a vibrating sample magnetometer(vsM).The enhanced saturation magnetization of 49.73 emu/g is obse.ved for x=0.10 and then saturation magnetizations are gradually decreased for x=0.15 and x=*** the remanent magnetization and coercivity also follow the same trend.

关键词： Ferrites sol-gel auto combustion La doping Magnetic properties rare earths

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Quantum-mechanical effects in photoluminescence from thin crystalline gold films

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Light(science & Applications) 2024年第4期13卷 783-794页

作者： Alan r.Bowman Alvaro rodríguez echarri Fatemeh Kiani Fadil Iyikanat Ted v.Tsoulos Joel D.Cox ravishankar sundararaman F.Javier García de Abajo Giulia Tagliabue Laboratory of Nanoscience for energy Technologies(LNeT) STIÉcole Polytechnique Fédérale de Lausanne(EPFL)LausanneSwitzerland ICFO–Institut de Ciencies Fotoniques The Barcelona Institute of Science and TechnologyCastelldefels(Barcelona)Spain. MBI–Max-Born-Institut BerlinGermany. POLIMA–Center for Polariton-driven Light–Matter Interactions University of Southern DenmarkOdense MDenmark. Danish Institute for Advanced study University of Southern DenmarkOdense MDenmark. Department of Materials science&engineering Rensselaer Polytechnic InstituteTroyNYUSA. Department of Physics Applied Physicsand AstronomyRensselaer Polytechnic InstituteTroyNYUSA. ICreA–Institucio Catalana de recerca i estudis Avancats BarcelonaSpain

Luminescence constitutes a unique source of insight into hot carrier processes in metals,including those in plasmonic nanostructures used for sensing and energy ***,being weak in nature,metal luminescence remains poorly understood,its microscopic origin strongly debated,and its potential for unraveling nanoscale carrier dynamics largely ***,we reveal quantum-mechanical effects in the luminescence emanating from thin monocrystalline gold ***,we present experimental evidence,supported by first-principles simulations,to demonstrate its photoluminescence origin(i.e.,radiative emission from electron/hole recombination)when exciting in the interband *** model allows us to identify changes to the measured gold luminescence due to quantum-mechanical effects as the gold film thickness is ***,such effects are obse.vable in the luminescence signal from flakes up to 40 nm in thickness,associated with the out-of-plane discreteness of the electronic band structure near the Fermi *** qualitatively reproduce the obse.vations with first-principles modeling,thus establishing a unified description of luminescence in gold monocrystalline flakes and enabling its widespread application as a probe of carrier dynamics and light-matter interactions in this *** study paves the way for future explorations of hot carriers and charge-transfer dynamics in a multitude of material systems.

关键词： luminescence quantum crystalline

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Governance in the exploration of global and regional determinants of ICT development

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International Journal of Innovation studies 2024年第2期8卷 132-153页

作者： Charles s.saba simplice A.Asongu Nicholas Ngepah Yolande e.Ngoungou school of economics College of Business and EconomicsUniversity of JohannesburgJohannesburgSouth Africa Department of econornic&Data science New Uzbekistan University54 Mustaili AvenueTashkent100007Uzbekistan University of Yaounde 2 SoaCameroon

The present study assesses how governance affects information and communication technology(IcT)at the global level contingent on macroeconomic policy factors such as trade,foreign direct investment(FDI),manufacturing value added,and agricultural value *** study focuses on 183 countries from 2003 to 2021,and the empirical evidence is based on the generalized method of moments(GMM).The following main findings are *** the full sample,governance unconditionally promotes ICT development,while trade openness(industrial added value)moderates governance to promote(dampen)ICT *** sub-saharan Africa,only trade openness effectively moderates governance to induce an overall positive effect on ICT,while in the Middle east and North Africa(MeNA)region,all policy variables moderate governance for an overall positive incidence on ICT sector *** findings for the MeNA region are confirmed in the europe and Central Asia(eCA)region,with the exception of the moderating role of industrial added value,which engenders an overall negative *** the east and south Asia and the Pacific(esAP)countries,one overall positive incidence is apparent in the role of trade openness,while net negative effects are established from the moderating roles of industrial added value and agricultural added *** the American sub-sample,a positive(negative)net effect is apparent from the role of industrial added value(trade)in moderating the incidence of gover-nance on ICT sector ***,policy implications are discussed.

关键词： ICT Governance Trade FDI Industry Agriculture

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Wormhole solutions under the effect of dark matter in f(r,L_(m))gravity

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Communications in Theoretical Physics 2024年第5期76卷 102-113页

作者： Lakhan v Jaybhaye Moreshwar Tayde PK sahoo Department of Mathematics Birla Institute of Technology and Science-PilaniHyderabad CampusHyderabad-500078India

In the background of f(r,L_(m))gravity,this work investigates three distinct dark matter halo profiles to test the possibility of generalised wormhole geometry within the galactic halo *** current study aims to accomplish these goals by examining various dark matter profiles including universal rotation curves(UrC),Navarro-Frenk-White(NFW)model-Ⅰ,and NFW model-Ⅱinside two distinct f(r,L_(m))gravity *** to the f(r,L_(m))=r/2+L^(a)_(m)model,the dark matter(DM)halo density profiles produce suitable shape functions that meet all the necessary requirements for exhibiting the wormhole geometries with appropriate choice of free *** addition,to examine DM profiles under the f(r,L_(m))=r/2+(1+λr)L_(m) model,we consider a specific shape ***,we obse.ved that the derived solution from both two models violates the null energy constraints,confirming that the DM supports wormholes to maintain in the galactic halo.

关键词： f(r L_(m))gravity wormhole dark matter(some figures may appear in colour only in the online journal)

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