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Structural Thermal Stability of Graphene Oxide-Doped Copper–Cobalt Oxide Coatings as a Solar Selective Surface

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Journal of Materials Science & Technology 2016年第11期32卷 1179-1191页

作者： M.Mahbubur Rahman Zhong-Tao Jiang Chun-Yang Yin Lee Siang Chuah Hooi-Ling Lee Amun Amri Bee-Min Goh Barry J.Wood Chris Creagh Nicholas Mondinos mohmmednoor altarawneh Bogdan Z.Dlugogorski Surface Analysis and Materials Engineering Research Group School of Engineering & Information Technology Murdoch University Murdoch Western Australia 6150 Australia School of Sdence & Engineering Teesside University Borough Road Middlesbrough TSI 3BA United Kingdom Department of Physics School of Distance Education Universiti Sains Malaysia Minden 11800 Penang Malaysia Department of Chemistry School of Chemical Sciences Universiti Sains Malaysia Minden 11800 Penang Malaysia Department of Chemical Engineering Universitas Riau Pekanharu Indonesia School of Chemistry Bedson Building Newcastle University NE1 7RU United Kingdom School of Chemistry The University of Queensland St. Luda OLD 4072 Australia School of Engineering & Information Technology Murdoch University Murdoch Western Australia 6150 Australia

3d transition metal oxides based thin film coatings such as copper–cobalt oxides exhibit high absorption in the visible region and low emittance in the infrared to far-infrared region of the solar spectrum which is favourable for use as potential selective surface materials in photothermal devices. These materials have the potential to minimize heating while increasing absorption in the operative spectrum range and therefore achieve higher solar selectivity. A series of mixed copper–cobalt metal spinel oxides（Cu_xCo_yO_z）doped with graphene oxide thin films were deposited on commercial grade aluminium substrates using a sol-gel dip-coating technique at an annealing temperature of 500 °C in air for 1 h. Characterizations of the synthesized films were carried out by high temperature synchrotron radiation X-ray Diffraction（SRXRD）, UV–Vis, Fourier Transform infrared spectroscopy（FTIR） and X-ray photoelectron microscopy（XPS）techniques. High thermal stability of coatings with multiple phases, binary and ternary metal oxides, was defined through SR-XRD study. FTIR analysis shows moderate（〈80%） to high（up to 99%） reflectance in the infrared region while the UV–Vis investigations demonstrate that, in the visible region, solar absorption increases gradually（up to 95%） with the addition of graphene oxide to the Cu_x Co_y O_z *** the incorporation of 1.5 wt.% of graphene oxide to the copper–cobalt oxide coatings, a high solar selectivity of 29.01（the ratio of the average solar absorptance in visible and the average thermal emittance in infrared to far infrared region; α/ε） was achieved.

关键词： Coatings Sol-gel method Synchrotron radiation Fourier transform infrared spectroscopy X-ray diffraction X-ray photoelectron spectroscopy

Catalytic upgrading of bio-oil from halophyte seeds into transportation fuels

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Journal of Bioresources and Bioproducts 2023年第4期8卷 444-460页

作者： Labeeb Ali Toyin Shittu Mohamed Shafi Kuttiyathil Ayesha Alam Muhammad Z.Iqbal Abbas Khaleel Kaushik Sivaramakrishnan Mohammednoor altarawneh Department of Chemical and Petroleum Engineering United Arab Emirates UniversityAl-Ain 15551United Arab Emirates Department of Integrative Agriculture United Arab Emirates UniversityAl-Ain 15551United Arab Emirates Department of Chemistry United Arab Emirates UniversityAl-Ain 15551United Arab Emirates

Because of socioeconomic considerations,wide-scale production of biofuel necessitates the utilization of nonedible biomass feedstock that does not compete for land and fresh water *** this regard,Salicornia bigelovii(SB)is the most investigated halophyte *** high oil content in SB seeds has sparked mounting research that aims to utilize SB as an industrial crop in the production of bio-oil,particularly in coastal areas where these plants ***,the oil extracted from the pyrolysis of raw SB seeds is largely dominated by oxygenated fatty acids,most notably 9,12-octadecadienoic acid and 9,17-octadecadienal,typical to that of other *** pyrolysate bio-oil of the raw SB seeds exhibited a relative yield of oxygenated compounds that decreased from 57.05%at 200℃to 9.81%at 500℃,and the relative yield of nitrogenated compounds increased from 4.86%at 200℃to 21.97%at 500℃.To improve the quality of the produced bio-oil,herein we investigated the catalytic hydrodeoxygenation(HDO)of the fragments that were produced from the thermal degradation of SB seeds.A 5%Ni–CeO_(2)catalyst was prepared and characterized by a wide array of methods X-ray diffraction,X-ray photoelectron spectroscopy,temperature programmed reduction,scanning electron microscope,BrunauerEmmett-Teller analysis,and thermogravimetric *** catalytic run was executed between 200 and 500℃in a flow *** deployed catalytic methodology displayed a profound HDO *** 400℃,for instance,the gas chromatography mass spectroscopy(GC–MS)detected loads of paraffin and aromatic compounds exists at appreciable values of 48.0%and 28.5%,*** a total relative yield of 43.2%(at 400℃),C8–C15 species(i.e.,jet fuel fractions)were the most abundant species in the upgraded SB *** release of H_(2),CO,CO_(2),and CH_(4)was analyzed qualitatively and quantitatively using gas chromatography thermal conductivity detector and Fourier infrared spectroscopic *** the Ni

关键词： Salicornia bigelovii Bio-oil Hydrodeoxygenation Catalytic upgrading Transportation fuel Reaction mechanism

Manifestations of COVID-19 infection in children with malignancy:A single-center experience in Jordan

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World Journal of Virology 2022年第5期11卷 321-330页

作者： Mousa Ahmad Qatawneh Moath altarawneh Ruba Alhazaimeh Mais Jazazi Omaiema Jarrah Alaa Shorman Laila Alsadah Maher Mustafa Department of Hematology and Medical Oncology and Stem Cell Transplantation Unit Queen Rania Children’s HospitalRoyal Medical ServicesAmman 11183Jordan Department of Neonatology Queen Rania Children’s HospitalRoyal Medical ServicesAmman 11183Jordan Department of General Pediatrics Queen Rania Children’s HospitalRoyal Medical ServicesAmman 11183Jordan

BACKGROUND The coronavirus disease 2019(COVID-19)has been the cause of a global health crisis since the end of *** countries are following the guidelines and recommendations released by the World Health Organization to decrease the spread of the *** account for only 3%-5%of COVID-19 *** data are available regarding the clinical course,disease severity,and mode of treatment in children with malignancy and *** To evaluate the treatment plan and outcome of children with malignancy who contracted *** A retrospective study of the medical files of patients with malignancy who contracted COVID-19 between July 2020 and June 2021 was *** following data were reviewed for all patients:primary disease,laboratory data,admission ward,clinical status upon admission,disease course,treatment plan,and *** patients were those with malignancy who tested positive for COVID-19 by reverse transcription polymerase chain *** A total of 40 patients who had malignancy contracted COVID-19 from July 1,2020 to June 1,*** primary diseases were as follows:34 patients(85%)had hematological malignancies(30 had acute lymphoblastic leukemia,2 had acute myeloblastic leukemia,and 2 had Hodgkin lymphoma),whereas 6 patients(15%)had solid tumors(2 had neuroblastoma,2 had rhabdomyosarcoma,and 2 had central nervous system tumors).Twelve patients(30%)did not need hospitalization and underwent home isolation only,whereas twenty-eight patients(70%)required hospitalization(26 patients were admitted in the COVID-19 ward and 2 were admitted in the pediatric intensive care unit).CONCLUSION COVID-19 with malignancy in the pediatric age group has a benign course and does not increase the risk of having severe infection compared to other children.

关键词： COVID-19 Malignancy Disease severity score Children Jordan

Dielectric properties of single wall carbon nanotubes-based gelatin phantoms

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Journal of Advanced Dielectrics 2018年第2期8卷 38-43页

作者： M.M.altarawneh G.A.Alharazneh O.Y.Al-Madanat Department of Physics Mutah University MutahAlkarak 61710Jordan Department of Chemistry Mutah UniversityMutahAlkarak 61710Jordan Institute for Technical Chemistry Gottfried Wilhelm Leibniz Universitat Hannover Callinstraße 5 30167 HannoverGermany

In this work,we report the dielectric properties of Single wall Carbon Nanotubes(SWCNTs)-based phantom that is mainly composed of gelatin and *** fabricated gelatin-based phantom with desired dielectric properties was fabricated and doped with different concentrations of SWCNTs(e.g.,0%,0.05%,0.10%,0.15%,0.2%,0.4%and 0.6%).The dielectric constants(realε′ and imaginaryε′)were measured at different positions for each sample as a function of frequency(0.5-20 GHz)and concentrations of SWCNTs and their averages were *** Cole–Cole plot(ε′ versusε′)was obtained for each concentration of SWCNTs and was used to obtain the static dielectric constantεs,the dielectric constant at the high limit of frequencyε∞ and the average relaxation timeτ.The measurements showed that the fabricated samples are in good homogeneity and the SWCNTs are dispersed well in the samples as an acceptable standard deviation is *** study showed a linear increase in the static dielectric constantτ and invariance of the average relaxation time τ and the value ofε∞ at room temperature for the investigated concentrations of SWCNTs.

关键词： Single-wall carbon nanotubes dielectric relaxation time Cole-Cole model

Functionalized graphene oxide-reinforced electrospun carbon nanofibers as ultrathin supercapacitor electrode

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Journal of Energy Chemistry 2017年第4期26卷 790-798页

作者： W.K.Chee H.N.Lim Y.Andou Z.Zainal A.A.B.Hamra I.Harrison M.altarawneh Z.T.Jiang N.M.Huang Department of Chemistry Faculty of ScienceUniversiti Putra Malaysia Functional Device Laboratory Institute of Advanced TechnologyUniversiti Putra Malaysia Graduate School of Life Science and Systems Engineering Eco-Town Collaborative R&D Center for the Environment and RecyclingKyushu Institute of Technology Department of Electrical and Electronic Engineering Faculty of EngineeringUniversity of Nottingham Surface Analysis and Materials Engineering Research Group School of Engineering and Information TechnologyMurdoch University Faculty of Engineering Xiamen University of Malaysia

Graphene oxide has been used widely as a starting precursor for applications that cater to the needs of tunable graphene. However, the hydrophilic characteristic limits their application, especially in a hydrophobic condition. Herein, a novel non-covalent surface modification approach towards graphene oxide was conducted via a UV-induced photo-polymerization technique that involves two major routes; a UV-sensitive initiator embedded via pi-pi interactions on the graphene planar rings, and the polymerization of hydrophobic polymeric chains along the surface. The functionalized graphene oxide successfully achieved the desired hydrophobicity as it displayed the characteristic of being readily dissolved in organic solvent. Upon its addition into a polymeric solution and subjected to an electrospinning process,non-woven random nanofibers embedded with graphene oxide sheets were obtained. The prepared polymeric nanofibers were subjected to two-step thermal treatments that eventually converted the polymeric chains into a carbon-rich conductive structure. A unique morphology was observed upon the addition of the functionalized graphene oxide, whereby the sheets were embedded and intercalated within the carbon nanofibers and formed a continuous structure. This reinforcement effectively enhanced the electrochemical performance of the carbon nanofibers by recording a specific capacitance of up to 140.10 F/g at the current density of 1 A/g, which was approximately three folds more than that of pristine *** also retained the capacitance up to 96.2% after 1000 vigorous charge/discharge cycles. This functionalization technique opens up a new pathway in tuning the solubility nature of graphene oxide towards the synthesis of a graphene oxide-reinforced polymeric structure.

关键词： Non-covalent functionalization Functionalized graphene oxide Electrospinning Carbon nanofiber Supercapacitor electrode