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Bimetallic Single‑Atom Catalysts for Water Splitting

Nano-Micro Letters 2025年第1期17卷 1-45页

作者： Megha A.Deshmukh Aristides Bakandritsos Radek Zbořil nanotechnology Centre Centre for Energy and Environmental TechnologiesVŠB–Technical University of Ostrava17.listopadu 2172/1570800 Ostrava‑PorubaCzech Republic Regional Centre of Advanced Technologies and Materials Czech Advanced Technology and Research Institute(CATRIN)Palacky University OlomoucŠlechtitelů241/2778371 Olomouc–HoliceCzech Republic

Green hydrogen from water splitting has emerged as a critical energy vector with the potential to spearhead the global transition to a fossil fuel-independent *** field of catalysis has been revolutionized by single-atom catalysts(SACs),which exhibit unique and intricate interactions between atomically dispersed metal atoms and their ***,bimetallic SACs(bimSACs)have garnered significant attention for leveraging the synergistic functions of two metal ions coordinated on appropriately designed *** offer an avenue for rich metal–metal and metal–support cooperativity,potentially addressing current limitations of SACs in effectively furnishing transformations which involve synchronous proton–electron exchanges,substrate activation with reversible redox cycles,simultaneous multi-electron transfer,regulation of spin states,tuning of electronic properties,and cyclic transition states with low activation *** review aims to encapsulate the growing advancements in bimSACs,with an emphasis on their pivotal role in hydrogen generation via water *** subsequently delve into advanced experimental methodologies for the elaborate characterization of SACs,elucidate their electronic properties,and discuss their local coordination ***,we present comprehensive discussion on the deployment of bimSACs in both hydrogen evolution reaction and oxygen evolution reaction,the two half-reactions of the water electrolysis process.

关键词： Single-atom catalysts Single-atom dimers Hydrogen evolution Oxygen evolution Water splitting

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A Facile Method for Dye and Heavy Metal Elimination by p H Sensitive Acid Activated Montmorillonite/Polyethersulfone Nanocomposite Membrane

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Chinese Journal of Polymer Science 2018年第1期36卷 49-57页

作者： Mehdi Mahmoudian Peyman Gozali Balkanloo Ehsan Nozad nanotechnology Research institute Urmia University

Modified clay/polyethersulfone（PES） mixed matrix membranes（MMMs） were prepared by acid activated montmorillonite（AA-MMT） with different concentrations and used to eliminate dyes and remove heavy metals from aqueous solution. The morphology and physiochemical properties of prepared clay nanoparticles and MMMs were characterized using X-ray diffraction（XRD）, Fourier transform infrared（FTIR） spectroscopy, scanning electron microscopy（SEM）, enegy dispersive X-ray（EDX） spectroscopy, Brunauer-Emmett-Teller（BET） analysis, atomic force microscopy（AFM）, contact angle measurement and fouling studies. The filtration study showed that removal of dyes and heavy metals was strongly dependent on p H so that dyes with positive and negative charges showed different separation efficiency in acidic and alkaline conditions. The modified membranes possessed better heavy metal removal in acidic and alkaline p Hs. When the rejection of heavy metals was measured in an alkaline environment, it was observed that the rejection had a great increase compared to the neutral values for Zn^（2＋） and Ni^（2＋） ions, while rejection of Cu^（2＋） and Cd^（2＋） did not undergo significant changes. So it can be concluded that modified membranes show good selectivity for elimination of Zn^（2＋） and Ni^（2＋） ions with respect to other cations.

关键词： Nanocomposite membranes Acid activated montmorillonite Heavy metal/dye elimination

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The risk factors of SARS-CoV-2 antibody level differences in healthcare workers post vaccination in Siloam hospitals:A nationwide multicenter study

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Infectious Medicine 2022年第4期1卷 229-235页

作者： Allen Widysanto Ignatius Bima Prasetya Tandry Meriyanti Veli Sungono Diane Lukito Setiawan Edy Gunawan Bayu Adiputra Jane Olivia Lorens Theresia Santi Cindy Meidy Leony Pradhana Irawan Yusuf Catherine Gunawan Siloam Hospitals Lippo Village BantenIndonesia Faculty of Medicine Pelita Harapan UniversityBantenIndonesia Siloam Hospitals Surabaya East JavaIndonesia Clinical Research Department Siloam Hospitals Group BantenIndonesia Siloam Hospitals Lippo Cikarang West JavaIndonesia mochtar riady institute for nanotechnology BantenIndonesia

Background:Several vaccines have been approved against COVID-19,and 5 have been used in *** to the decrease in antibody levels 3 to 6 months after the second dose of CoronaVac,healthcare workers received the third booster of mRNA vaccine(mRNA-1273)to increase the antibody *** study aimed to evaluate the risk factors of anti-S-RBD IgG levels differences in healthcare ***:This study is a retrospective cohort study of 576 healthcare workers without previous SARS-CoV-2 infection who received 2 doses of CoronaVac and the third dose of mRNA-12736 months after the second *** samples were obtained 2nd,6th,12th,and 24th weeks after the second dose of CoronaVac vaccine administration,with mRNA-1273 booster on week *** measurements of IgG antibodies were performed with Elecsys Anti-SARS-CoV-2 S *** identify the baseline factors predicting post-vaccination antibody titers using univariate and multivariate linear regression ***:This study comprised 576 participants aged 32 years old,72.05%female,and 45.84%from high-risk occupation *** median antibodies titer level on the 2nd,6th,12th,and 24th weeks after the second vaccine dose administration were 40.99 u/mL,42.01 u/mL,54.78 u/mL,and 23,225 u/*** levels trended highest in female and younger age group(20-29 years old).Conclusions:The third dose of vaccine increased the quantitative SARS-CoV-2 spike IgG antibody titers and eliminated differences in antibodies titer by gender.

关键词： Antibodies titer COVID-19 Immune response S-RBD IgG Vaccine

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Preparation and characterization of colloidal dispersions of graphene-like structures from different ranks of coals

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燃料化学学报 2017年第8期45卷 897-907页

作者： D.P.Savitskii institute of Biochemical Technology and nanotechnology RUDN University

This paper focuses on preparation of colloidal solution of graphene-like structures from different ranks of coals: brown coal,bituminous coal,low-volatile bituminous coal,anthracite. It was found that brown coal thermo-oxidative destruction leads to formation of small d = 32 nm( V = 17%) and large d = 122 nm( V = 11%) fractions of nanoparticles. The thermo-oxidative destruction of bituminous coal leads to formation of nanoparticles d = 50 nm( V = 5.2%) and d = 164 nm( V = 16%). Thermooxidative destruction of low-volatile bituminous coal and anthracite leads to formation of nanoparticles,predominantly,d = 122-190 nm. Carbon nanostructures obtained from coal are negatively charged at pH= 2-12. Colloidal solution of carbon nanostructures at dispersed phase concentration 0. 01 mg/mL is stable for 1 month. Electron diffraction patterns and X-ray analysis of carbon nanostructures showed that nanostructure from brown coal is amorphous and nanostructure from anthracite is crystalline. Results of coal macromolecules modeling and graphene-like structures obtained from them are presented.

关键词：象 graphene 一样结构煤胶体的分散粒子尺寸分发 electrokinetic 潜力

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Nonrelativistic Lamb shift in a nano-sized conducting ring

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Science China(Physics,Mechanics & Astronomy) 2012年第8期55卷 1383-1388页

作者： OLESEN D. S. KELLER O. institute of Physics and nanotechnology Aalborg University

A theoretical calculation of the nonrelativistic Lamb shift in nano-sized semiconducting （GaAs） and metallic （AI） circular rings is carried out. On the basis of a flat one-electron potential with infinitely high barriers, the radiative back-action is obtained to second order in perturbation theory. Numerical results are presented for the radiative correction to the transition frequency between the ground state and first excited radial quantum states （initial state：（1,1,0）, final state：（2,1,0）） neglecting the curvature term in the Schr6dinger equation. Lamb shifts are calculated as functions of the inner ring radius, the ring thickness, and the temperature.

关键词： Lamb shift nano-ring mesoscopic quantum electrodynamics

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Space-time description of transverse photons: near-field aspects

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Science China(Physics,Mechanics & Astronomy) 2012年第8期55卷 1389-1393页

作者： KELLER O. institute of Physics and nanotechnology Aalborg University

A mean position state based on the gauge invariant transverse vector potential is used to convert single-photon states in Hilbert space to photon wave packets in direct space. The resulting photon wave-mechanical description leads to scalar products which relate to covariant integration on the light cone. A new correlation matrix displays the spatial localization problem for single photons in an explicit manner in space-time. The correlation matrix essentially is the projection of the time-ordered Feynman photon propagator onto the transverse photon subspace. The present photon wave-mechanical formalism is generalized to two-photon dynamics. In the diamagnetic limit the transverse photon becomes massive in its interaction with matter, and the correlation matrix for massivephoton interaction, which can be used in studies of evanescent-photon mediated couplings, is analyzed. On the basis of the present formalism the existence of a dynamical near-field Aharonov-Bohm effect is predicted.

关键词： one-photon wave mechanics near-field optics correlation matrix transverse photon mass

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A Fully Self-Healing Piezoelectric Nanogenerator for Self-Powered Pressure Sensing Electronic Skin

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Research 2021年第1期2021卷 876-884页

作者： Maosen Yang Jinmei Liu Dong Liu Jingyi Jiao Nuanyang Cui Shuhai Liu Qi Xu Long Gu Yong Qin School of Advanced Materials and nanotechnology Xidian UniversityXi’an 710071China institute of Nanoscience and nanotechnology Lanzhou UniversityGansu 730000China

As an important way of converting mechanical energy into electric energy,a piezoelectric nanogenerator(PENG)has been widely applied in energy harvesting as well as self-powered sensors in recent ***,its robustness and durability are still severely challenged by frequent and inevitable mechanical impacts in real application ***,a fully selfhealing PENG(FS-PENG)as a self-powered pressure sensing electronic skin is *** self-healing piezoelectric composite and self-healing Ag NW electrode fabricated through mixing piezoelectric PZT particles and conductive Ag NWs into self-healing polydimethylsiloxane(H-PDMS)are assembled into the sandwich structure *** FS-PENG could not only effectively convert external stimulation into electrical signals with a linear response to the pressure but also retain the excellent self-healing and stable sensing property after multiple cycles of cutting and self-healing ***,a self-healing pressure sensor array composed of 9 FS-PENGs was attached on the back of the human hand to mimic the human skin,and accurate monitoring of the spatial position distribution and magnitude of the pressure was successfully realized.

关键词： piezoelectric healing generator

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Enhance of TiO_2 dopants incorporated reduced graphene oxide via RF magnetron sputtering for efficient dye-sensitised solar cells

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Rare Metals 2018年第11期37卷 919-928页

作者： Foo Wah Low Chin Wei Lai Kian Mun Lee Joon Ching Juan nanotechnology and Catalysis Research Centre Institute Postgraduate Studies University of Malaya

In particular, the dye-sensitised solar cells(DSSCs) have a high potential in the rational energy conversion efficiency to secure our sustainable energy *** the present study, advanced radio frequency(RF) magnetron sputtering technique was applied to incorporate titanium dioxide(TiO) dopants into reduced graphene oxide(rGO) nanosheet for improving the power conversion efficiency(PCE) of DSSCs device. An optimum TiOcontent incorporated onto rGO nanosheet plays an important role in improving the PCE of DSSCs by minimising the recombination losses of photo-induced charge *** on the results obtained, 40-s sputtering duration for incorporating TiOdopants onto rGO nanosheet exhibits a maximum PCE of 8.78% than that of pure rGO film(0.68%). In fact, the presence of optimum content of TiOdopants within rGO nanosheet could act as mediators for efficient separation photo-induced charge carriers. However, the excessive of sputtering duration(e.g. 60 s) of TiOdopants onto rGO nanosheet results higher charge recombination and lowers the PCE of DSSCs(5.39%).

关键词： Dye-sensitised solar cell RF magnetron sputtering Titanium dioxide Reduced graphene oxide

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Nonlinear vibration analysis of laminated composite Mindlin micro/nano-plates resting on orthotropic Pasternak medium using DQM

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Applied Mathematics and Mechanics(English Edition) 2015年第8期36卷 1033-1044页

作者： A.G.ARANI G.S.JAFARI Faculty of Mechanical Engineering University of Kashan institute of Nanoscience & nanotechnology University of Kashan

The nonlocal nonlinear vibration analysis of embedded laminated micro- plates resting on an elastic matrix as an orthotropic Pasternak medium is investigated. The small size effects of micro/nano-plate are considered based on the Eringen nonlocal theory. Based on the orthotropic Mindlin plate theory along with the von Kármán geo- metric nonlinearity and Hamilton＇s principle, the governing equations are derived. The differential quadrature method （DQM） is applied for obtaining the nonlinear frequency of system. The effects of different parameters such as nonlocal parameters, elastic me- dia, aspect ratios, and boundary conditions are considered on the nonlinear vibration of the micro-plate. Results show that considering elastic medium increases the nonlinear frequency of system. F^lrthermore, the effect of boundary conditions becomes lower at higher nonlocal parameters.

关键词： nonlinear vibration laminated micro-plate orthotropic Pasternak medium,differential quadrature method

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Engineering lattice defects in 2D nanomaterials for enhancing biomedical performances

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Particuology 2022年第5期20卷 121-133页

作者： Zhi Qi Li Li Zhi Ping Xu Australian institute for Bioengineering and nanotechnology The University of QueenslandBrisbaneQLD 4072Australia

2D nanomaterials are widely investigated for biomedical applications,attributed to their large specific surface area,high therapeutic loading capacity,and unique optical,thermal,and/or electronic *** defects affect the theranostic performance of 2D nanomaterials significantly by altering their electronic properties and chemical *** investigations have shown that defect-rich 2D nanomaterials are capable of enhancing tumor treatment through efficient drug delivery,photothermal and photodynamic therapies(PTT and PDT),and improving diagnostics via computed tomography(CT),photoacoustic and magnetic resonance *** review summarizes recent progresses,including synthesis,characterization approach,and applications of defect-engineered 2D nanomaterials that are potentially useful in cancer *** expert opinions are also proposed as the conclusion.

关键词： 2D nanomaterials Engineering lattice defects Cancer theranostics Phototherapy

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