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Noncovalent reversible binding-enabled facile fabrication of leak-free PDMS microfluidic devices without plasma treatment for convenient cell loading and retrieval

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Bioactive Materials 2022年第10期7卷 346-358页

作者： Bin Jiang Alisa White Wenquan ou Sarah Van Belleghem Samantha Stewart James G.Shamul shaik o.rahaman John P.Fisher Xiaoming He Fischell Department of Bioengineering University of MarylandCollege ParkMD20742USA Department of Nutrition and Food Science University of MarylandCollege ParkMD20742USA Marlene and Stewart Greenebaum Comprehensive Cancer Center University of MarylandBaltimoreMD21201USA

The conventional approach for fabricating polydimethylsiloxane(PDMS)microfluidic devices is a lengthy and inconvenient procedure and may require a clean-room microfabrication facility often not readily ***,living cells can’t survive the oxygen-plasma and high-temperature-baking treatments required for covalent bonding to assemble multiple PDMS parts into a leak-free device,and it is difficult to disassemble the devices because of the irreversible covalent *** a result,seeding/loading cells into and retrieving cells from the devices are ***,we discovered that decreasing the curing agent for crosslinking the PDMS prepolymer increases the noncovalent binding energy of the resultant PDMS surfaces without plasma or any other *** enables convenient fabrication of leak-free microfluidic devices by noncovalent binding for various biomedical applications that require high pressure/flow rates and/or long-term cell culture,by simply hand-pressing the PDMS parts without plasma or any other treatment to bind/*** this method,multiple types of cells can be conveniently loaded into specific areas of the PDMS parts before assembly and due to the reversible nature of the noncovalent bonding,the assembled device can be easily disassembled by hand peeling for retrieving *** with 3D printers that are widely available for making masters to eliminate the need of photolithography,this facile yet rigorous fabrication approach is much faster and more convenient for making PDMS microfluidic devices than the conventional oxygen plasma-baking-based irreversible covalent bonding method.

关键词： Binding energy 3D printing Soft lithography Microfluidics Polydimethylsiloxane

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Improving the operational stability of perovskite solar cells with cesium-doped graphene oxide interlayer

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Journal of Energy Chemistry 2024年第9期96卷 483-490页

作者： Masaud Almalki Katerina Anagnostou Konstantinos Rogdakis Felix T.Eickemeyer Mostafa othman Minas M.Stylianakis Dimitris Tsikritzis Anwar Q.Alanazi Nikolaos Tzoganakis Lukas Pfeifer Rita Therisod Xiaoliang Mo Christian M.Wolff Aïcha Hessler-Wyser shaik M.Zakeeruddin Hong Zhang Emmanuel Kymakis Michael Grätzel Laboratory of Photonics and Interfaces École Polytechnique Fédérale de Lausanne(EPFL)Lausanne 1015Switzerland Department of Electrical and Computer Engineering Hellenic Mediterranean UniversityHeraklionCrete 71410Greece Institute of Electrical and Microengineering(IEM)Photovoltaics and Thin-Film Electronics Laboratory(PV-Lab) École Polytechnique Fédérale de Lausanne(EPFL)Neuchâtel 2000Switzerland Department of Nursing Faculty of Health SciencesHellenic Mediterranean UniversityCrete 71410Greece Centre Interdisciplinaire de Microscopie Electronique École Polytechnique Fédérale de Lausanne(EPFL)Lausanne 1015Switzerland Future Energy Technology Institute King Abdulaziz City for Science and Technology(KACST)P.O.Box 6086Riyadh 11442Saudi Arabia State Key Laboratory of Photovoltaic Science and Technology Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and PerceptionInstitute of OptoelectronicsDepartment of Materials ScienceFudan UniversityShanghai 200433China

Perovskite solar cells(PSCs)have made great advances in terms of power conversion efficiency(PCE),yet their subpar stability continues to hinder their *** interface between the perovskite layer and the charge-carrier transporting layers plays a crucial role in undermining the stability of *** this work,we propose a strategy to stabilize high-performance PSCs with PCE over 23%by introducing a cesium-doped graphene oxide(Go-Cs)as an interlayer between the perovskite and hole-transporting *** Go-Cs treated PSCs exhibit excellent operational stability with a projected T80(the time where the device PCE reduces to 80%of its initial value)of 2143 h of operation at the maximum powering point under one sun illumination.

关键词： Perovskite solar cells Doped graphene oxide Graphene related material Long-term operational stability

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In situ deposited cobalt-magnesium selenates as an advanced electrode for electrochemical energy storage

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Journal of Magnesium and Alloys 2022年第12期10卷 3565-3575页

作者： Manchi Nagaraju S.Chandra Sekhar Bhimanaboina Ramulu shaik Junied Arbaz Jae Su Yu Department of Electronics and Information Convergence Engineering Kyung Hee University1732 Deogyeong-aeroGihung-guYongin-siGyeonggi-do 17104Republic of Korea

Currently,bimetallic selenates have attracted much attention as a prominent electrode composite material for supercapacitors owing to their higher redox chemistry and superior electrical ***,we synthesized cobalt-magnesium selenates (CoSeo3-Mg Se o4,CMS) via a facile hydrothermal process,followed by *** first,cobalt-magnesium oxide (Co2.32Mg0.68o4,CMo) was in situ prepared by a one-pot hydrothermal *** investigation on the morphological change was performed by synthesizing the same CMo samples at different growth times by keeping the temperature *** CMo electrode designed for 8 h of growth time (CMo-8 h)with an attractive morphology showed a higher areal capacity of 101.7μAh cm-2(at 3 m A cm-2) than the other CMo electrodes prepared for 6 and 10 *** exalted performance was achieved by the selenization of the CMo-8 h sample to form the CMS *** 3 m A cm-2,the resulted CMS exhibited nearly three times higher capacity,i.e.,385.4μAh cm-2,than the CMo-8 h ***,an asymmetric cell fabricated with CMS as a positive electrode also revealed good energy storage *** the applied voltage between 0 and 1.5 V,the asymmetric cell demonstrated maximum energy density of 0.159 m Wh cm-2(18.6 Wh kg-1) and maximum power density of 18.47 m W cm-2(1938 W kg-1),***,novel magnesium-based metal selenates can act as an efficient electrode for energy storage.

关键词： Co2.32Mg0.68o4 CoSeo3–MgSeo4 In situ formation Energy storage Asymmetric cell

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Unveiling the parasitic-reaction-driven surface reconstruction in Ni-rich cathode and the electrochemical role of Li_(2)Co_(3)

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Journal of Energy Chemistry 2023年第10期85卷 126-136,I0006页

作者： Jiyu Cai Zhenzhen Yang Xinwei Zhou Bingning Wang Ana Suzana Jianming Bai Chen Liao Yuzi Liu Yanbin Chen Shunlin Song Xuequan Zhang Li Wang Xiangming He Xiangbo Meng Niloofar Karami Baasit Ali shaik Sulaiman Natasha A.Chernova Shailesh Upreti Brad Prevel Feng Wang Zonghai Chen Chemical Sciences and Engineering Division Argonne National Laboratory9700 South Cass AvenueLemontIL 60439USA Center for Nanoscale Materials Argonne National Laboratory9700 South Cass AvenueLemontIL 60439USA Condensed Matter Physics and Materials Science Department Brookhaven National LaboratoryUptonNY 11973USA Energy and Photon Sciences Directorate Brookhaven National LaboratoryUptonNY 11973USA Beijing Easprint Material Technology Co.Ltd. Beijing 100160China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China Department of Mechanical Engineering University of ArkansasFayettevilleAR 72701USA Charge CCCV(C4V) 45 Murray Hill RoadCenter of ExcellenceBinghamton UniversityVestalNY 13850USA Primet Precision Materials 950 Danby RoadIthacaNY 14850USA Applied Materials Division Argonne National Labo

Nickel-rich transition-metal oxides are widely regarded as promising cathode materials for high-energydensity lithium-ion batteries for emerging electric vehicles. However, achieving high energy density in Ni-rich cathodes is accompanied by substantial safety and cycle-life obstacles. The major issues of Ni-rich cathodes at high working potentials are originated from the unstable cathode-electrolyte interface, while the underlying mechanism of parasitic reactions towards surface reconstructions of cathode materials is not well understood. In this work, we controlled the Li_(2)Co_(3) impurity content on LiNi_(0.83)Mn_(0.1)Co_(0.07)o_(2) cathodes using air, tank-air, and o_(2) synthesis environments. Home-built high-precision leakage current and on-line electrochemical mass spectroscopy experiments verify that Li_(2)Co_(3) impurity is a significant promoter of parasitic reactions on Ni-rich cathodes. The rate of parasitic reactions is strongly correlated to Li_(2)Co_(3) content and severe performance deterioration of Ni83 *** post-mortem characterizations via high-resolution transition electron microscope and X-ray photoelectron spectroscopy depth profiles reveal that parasitic reactions promote more Ni reduction and o deficiency and even rock-salt phase transformation at the surface of cathode materials. our observation suggests that surface reconstructions have a strong affiliation to parasitic reactions that create chemically acidic environment to etch away the lattice oxygen and offer the electrical charge to reduce the valence state of transition metal. Thus, this study advances our understanding on surface reconstructions of Nirich cathodes and prepares us for searching for rational strategies.

关键词： Ni-rich cathodes Surface reconstructions Phase transformation Parasitic reactions Li_(2)Co_(3)

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Novel synthesis of cerium oxide nano photocatalyst by a hydrothermal method

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Journal of Semiconductors 2021年第12期42卷 35-43页

作者： Fowziya shaik Ali Faisal Al Marzouqi AAfroos Banu M.Ismail Fathima A.R.Mohamed Jahangir K.Mohamed Rafi A.Ayeshamariam Department of Chemistry Khadir Mohideen CollegeAdirampattinam 614701(Affiliated to Bharathidasan UniversityTiruchirappalli)India Department of Process Engineering International Maritime College OmanFalaj Al QabailSuharOman Department of Physics Arul Anandar College(Auto)KarumathurMadurai 625514India Biyaq oilfield Services LLC Mina Al Fahal PC116MuscatSultanate of Oman Research Department of Botany Jamal Mohamed College(Auto)(Affiliated to Bharathidasan UniversityThiruchirappalli)-620020India Research Department of Physics Khadir Mohideen College(Affiliated to Bharathidasan UniversityThiruchirappalli)Adirampattinam-614701India

Crystalline cubic cerium oxide nano particles have been synthesized from cerium(Ⅲ)nitrate(Ce(No_(3))_(3).6H2_(o))and sodium hydroxide by a hydrothermal *** effect of three different molar ratios of the NaoH precipitating agent on structural,optical,and photo catalytic activity was *** synthesized cerium oxide nano particles were characterized by X-ray diffraction(XRD),a UV-vis spectrometer,scanning electron microscope(SEM),energy-dispersive X-ray spectroscopy(EDAX),Raman spectroscopy and X-ray photo electron spectroscopy(XPS).According to the findings,hydrothermally synthesized cerium oxide NPs have a high efficiency for photocatalytic degradation of methylene blue when exposed to UV *** water pollution is the major issue of the *** get fresh water,humans could search the resources to purify the water in simple way and degradation is the one of the methods to purify salt water.

关键词： cerium oxide nano particles photo catalysis hydrothermal process

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A novel polyherbal formulation containing thymoquinone attenuates carbon tetrachloride-induced hepatorenal injury in a rat model

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Asian Pacific Journal of Tropical Biomedicine 2020年第4期10卷 147-155页

作者： Aftab Ahmad Mohammed F.Abuzinadah Huda M.Alkreathy Hussam I.Kutbi Noor Ahmad shaik Varish Ahmad Shakir Saleem Asif Husain Health Information Technology Department Faculty of Applied StudiesKing Abdulaziz UniversityJeddah-21589Kingdom of Saudi Arabia Department of Medical Laboratory Technology Faculty of Applied Medical SciencesKing Abdulaziz UniversityP.O.Box 80402 Jeddah-21589JeddahKingdom of Saudi Arabia Department of Pharmacology Faculty of MedicineKing Abdulaziz UniversityJeddahSaudi Arabia Department of Pharmacy Practice Faculty of PharmacyKing Abdulaziz UniversityJeddahSaudi Arabia Department of Genetic Medicine Faculty of MedicineKing Abdulaziz UniversityJeddahSaudi Arabia Department of Public Health College of Health SciencesSaudi Electronic UniversityRiyadhKingdom of Saudi Arabia Department of Pharmaceutical Chemistry School of Pharmaceutical Education and ResearchJamia Hamdard(Hamdard University)New Delhi110062India

objective:To evaluate a novel polyherbal formulation(BSVT)containing the standardized extracts from the leaves of Boerhavia diffusa,Solidago virgaurea,Vitex negundo,and thymoquinone in CCl4 induced hepatorenal toxicity in ***:A total of 36 rats were divided into six groups including normal control,CCl4(2 mL/kg,i.p.),CCl4(2 mL/kg,i.p.)+Cystone?(750 mg/kg p.o.),CCl4(2 mL/kg,i.p.)+BSVT(25 mg/kg,p.o.),CCl4(2 mL/kg,i.p.)+BSVT(50 mg/kg,p.o.),and CCl4(2 mL/kg,i.p.)+BSVT(100 mg/kg,p.o.).All treatments were given for four *** levels of aspartate transaminase,alanine transaminase,alkaline phosphatase,cholesterol,total protein,serum urea,blood urea nitrogen and creatinine were *** dismutase,malondialdehyde,and glutathione peroxidase were evaluated in tissue *** histopathological study of liver and kidney tissues was also ***:Aspartate transaminase,alanine transaminase,alkaline phosphatase,cholesterol,serum urea,blood urea nitrogen and creatinine were significantly elevated(Potal protein was considerably reduced in the CCl4 group as compared to the normal control(Porenal *** addition,superoxide dismutase and glutathione peroxidase activities were significantly decreased(Pondialdehyde levels were increased markedly(Pormulation recovered these parameters towards a normal level in a dose-dependent ***:BSVT formulation ameliorates the hepatorenal toxicity in a dose-dependent ***,clinical studies are required to confirm its efficacy.

关键词： Boerhavia diffusa Solidago virgaurea Vitex negundo Thymoquinone Cystone^(█) Carbon tetrachloride Hepatorenal

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Association between preterm birth risk and polymorphism and expression of the DNA repair genes oGG1 and APE1 in Saudi women

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BIoCELL 2018年第1期42卷 1-6页

作者： ARWA oSAMA NEMER MoHAMMAD SAUD AL ANAZI RAMESA SHAFI BHAT ARJUMAND S.WARSY ZENEB A BABAY MoHAMMAD HADDAR JILANI shaik SooAD AL-DAIHAN Department of Biochemistry College of Science Genome Research Chair Department of BiochemistryCollege of Science Central Laboratory Female Center for Medical Studies and Scientific Section Department of obs/Gyn College of MedicineKing Saud UniversityP.O.Box 22452Zip code 11495RiyadhSaudi Arabia

Genomic instability and mutations caused by increases in oxidative stress during pregnancy can damage the fetoplacental unit and can upshot preterm *** damage to DNA may possibly be involved in etiology of preterm birth(PTB)which can be repaired by DNA repair *** the present study,we assessed the association of base excision repair gene family by analyzing the association of single nucleotide polymorphisms and genes expression in 8-oxoguanine glycosylase-1(oGG1)and apurinic-apyrimidinic endonuclease 1(APE1)genes with risk of preterm birth in Saudi *** analyzed genotypes of four single nucleotide polymorphisms(SNPs)(rs1052133,rs293795,rs2072668 and rs2075747)in oGG1 gene and three SNPs(rs1130409,rs3136814,and rs3136817)in APE1 gene using TaqMan Genotyping assay kits in 50 pairs of preterm cases and individually matched ***,gene expression level was explored by RT-PCR in 10 pairs of preterm placental tissues and individually matched normal placental *** oGG1 SNP,rs1052133(oR=0.497;c2=1.11;p=0.292)and rs2072668(oR=0.408;c2=1.90;p=0.167)and one APE1 SNP rs3136817(oR=0.458;c2=0.40;p=0.527)showed nonsignificant protective effect against PTB *** expression of both genes under study was found lower in the PTB *** and allele frequencies of both gene SNPs did not show any association with the risk of preterm delivery in Saudi women(P˃0.05).However,synthesis and release of oGG1 and APE1 proteins decreased in preterm placental tissues compared to term delivery reflects the probability of being one of the mechanisms leading to preterm birth.

关键词： Preterm birth oGG1 and APE1 genes oxidative stress SNPs

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Multiple Low-Lying States for Compound I of P450cam and Chloroperoxidase Revealed from Multireference Ab Initio QM/MM Calculations

Multiple Low-Lying States for Compound I of P450cam and Chlo...

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中国化学会第27届学术年会

作者：宋金帅 Sason shaik The Institute of Chemistry and the Lise Meitner-Minerva Center for Computational Quantum Chemistry Hebrew University of Jerusalem Givat Ram Campus State Key Laboratory of Physical Chemistry and Chemical Engineering Xiamen University

In this work we employed the multireference ab initio CASPT2/MM approach to systematically study the ground and low-lying excited states of important oxoiron（IV）-porphyrin cation-radical active species Por·+FeIV=o（Cys） in P450cam and CPo, termed Compound I （Cpd I）. our calculations suggest that except the ferryl triradicaloid state revealed by previous DFT/MM calculations, the ferryl pentaradicaloid quartet state and perferryl FeV doublet and quartet states may be accessible in energy. This result then raises an intriguing question whether those states contribute to the reactivity of Cpd I. In previous work employing DFT/MM approach, it has been found that hydrogen abstraction barrier with ferryl pentaradicaloid quartet state is lower than that with the ferryl triradicaloid state （Altun, A.;shaik, S.;Thiel, W. J. Am. Chem. Soc. 2007, 129, 8978-8987）. Hence definitely further study is required to explore the reactivity of these states at the multireference ab initio QM/MM level. The experiences and insight gained in this study for high valent transition metal state like FeV could be helpful for future successful application of this type of method to other related systems.

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Processing and Mechanical Properties of Al₂o₃ and Red Mud Particle Reinforced AA6061 Hybrid Composites

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Journal of Minerals and Materials Characterization and Engineering 2016年第2期4卷 135-142页

作者： shaik Mujeeb Quader B. Suryanarayana Murthy Pinninti Ravinder Reddy Department of Production Engineering DCET Hyderabad India Department of Mechanical Engineering GIT GITAM University Visakhapatnam India Department of Mechanical Engineering CBIT Hyderabad India

Aluminum 6061 alloy metal matrix composites (MMCs) reinforced with four different weight fractions of (Al2o3 + red mud) particles up to 10 wt% were fabricated by a vortex method. The effects of reinforcement content on the mechanical properties of the composites such as hardness and tensile strength were investigated. The density measurements showed that the samples contained little porosity, and the amount of porosity in the composites increased with increasing weight fraction of particles. Scanning electron microscopic observations of the microstructures revealed that the dispersion of the particles was uniform with small clusters at some places and porosity. The results showed that the hardness and the tensile strength of the composites increased with increasing weight fraction of particles.

关键词： MMCs Al2o3 Red Mud AA6061 Compocasting

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Perovskite Solar Cells Yielding Reproducible Photovoltage of 1.20 V

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Research 2019年第1期2019卷 1106-1114页

作者： Essa A.Alharbi M.Ibrahim Dar Neha Arora Mohammad Hayal Alotaibi Yahya A.Alzhrani Pankaj Yadav Wolfgang Tress Ahmed Alyamani Abdulrahman Albadri shaik M.Zakeeruddin Michael Grätzel Laboratory of Photonics and Interfaces Institute of Chemical Sciences and EngineeringEcole Polytechnique Federale de LausanneLausanne CH-1015Switzerland National Nanotechnology Research Centre King Abdulaziz City for Science and Technology(KACST)P.O.Box 6086Riyadh 11442Saudi Arabia National Center for Petrochemicals Technology King Abdulaziz City for Science and Technology(KACST)P.O.Box 608611442 RiyadhSaudi Arabia

High photovoltages and power conversion efciencies of perovskite solar cells(PSCs)can be realized by controlling the undesired nonradiative charge carrier ***,we introduce a judicious amount of guanidinium iodide into mixed-cation and mixed-halide perovskite flms to suppress the parasitic charge carrier recombination,which enabled the fabrication of>20%efcient and operationally stable PSCs yielding reproducible photovoltageas high as 1.20 *** introducing guanidinium iodide into the perovskite precursor solution,the bandgap of the resulting absorber material changed minimally;however,the nonradiative recombination diminished considerably as revealed by time-resolved photoluminescence and electroluminescence ***,using capacitance-frequency measurements,we were able to correlate the hysteresis features exhibited by the PSCs with interfacial charge *** study opens up a path to realize new record efciencies for PSCs based on guanidinium iodide doped perovskite flms.

关键词： perovskite iodide absorber

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