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In situassessment of terrestrial gamma radiation dose and associated radiological hazards in Katsina State, Nigeria

Isotopenpraxis Isotopes in Environmental and Health Studies 2023年第1期59卷 112-125页

作者： Nuraddeen Nasiru Garba Mukhtar Abdulkadir Rabiu Nasiru Muneer Aziz Saleh Suleiman Bello Mayeen Uddin Khandaker Che Azurahanim Che Abdullah Usman Musa Kankara a Department of Physics Ahmadu Bello University Zaria Nigeria a Department of Physics Ahmadu Bello University Zaria Nigeriab Department of Physics Isa Kaita College of Education Katsina State Nigeria c Nuclear Engineering Programme School of Chemical and Energy Engineering Faculty of Engineering Universiti Teknologi Malaysia Johore Bahru Malaysiad National Atomic Energy Commission (NATEC) Sana’a Yemen e Department of Physics Umaru Musa Yar’adua University Katsina Nigeria f Centre for Applied Physics and Radiation Technologies School of Engineering and Technology Sunway University Selangor Malaysia g Material Synthesis and Characterization Laboratory Institute of Advanced Technology (ITMA) University Putra Malaysia Selangor Malaysiah Department of Physics Faculty of Science University Putra Malaysia Selangor Malaysia

ABSTRACTABSTRACTTerrestrial gamma radiation dose (TGRD) rates were measuredin situfrom different locations in Katsina State, Nigeria, using a portable radiation survey metre based on geological formations and soil types. The measured TGRD rates ranged from 45 to 271 nGyh–1with an average value of 116 ± 1 nGyh–1. Geological formation (silicified sheared rock) and soil type (lithosols and ferruginous crusts and ferruginous tropical soils) appeared to have the highest mean TGRD values of 163 and 134 nGyh–1with sandstone geological formation and alluvial and hydromorphic soils having the lowest TGRD with values of 80 and 61 nGyh–1, respectively. One way ANOVA results shows that the tested null hypothesis was rejected. Thus, indicating that there exists a strong relationship between the various geological formations, soil types with the measured TGRD values based on the alternate hypothesis. Human health hazard indices like annual effective dose equivalent (AEDE), lifetime outdoor annual equivalent dose, and relative excess lifetime outdoor cancer risk associated with the mean TGRD of the study area were also calculated and found to be 0.711, 9.955 mSv, and 5.79 × 10–4, respectively. These values were higher than the world average values but favourable compared with the safety limits recommended by ICRP.

关键词： Cancer risk gamma radiation geological formation human health natural radioactivity Nigeria radionuclides soil types

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Enhanced microwave absorption properties of Nd-doped barium hexaferrite and reduced graphene oxide nanocomposites in the X-band

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Ceramics International 2025年

作者： Riyaz Mohammad Shahnawaz M. Abushad Azizurrahaman Ansari M.J. Akhtar Himangshu B. Baskey Shahid Husain Wasi Khan Department of Physics Aligarh Muslim University Aligarh-202002 India Materials Science Programme Indian Institute of Technology Kanpur Kanpur-208016 India Department of Physics Shibli National College MSD State University Azamgarh-276001 India Defence Material Store R and D Establishment DRDO Kanpur-208013 India

This study presents the synthesis of neodymium (Nd) doped barium hexaferrite (BHF), with the chemical composition Ba 1- x Nd x Fe 12 O 19 (where x = 0 to 0.20), and its nanocomposites with reduced graphene oxide (rGO) in order to investigate the microwave absorption properties within the X-band of microwave frequency. Pristine and Nd doped BHF nanopowders were synthesized via the sol-gel auto-combustion process, while the nanocomposites were prepared using the sonochemical method. X-ray diffraction (XRD) analysis established the successful formation of the desired BHF phase, as well as the formation of rGO and their nanocomposites. Raman spectroscopy and Fourier transform infrared (FTIR) spectroscopy were employed to confirm the structural integrity of the nanocomposite, providing evidence of distinct vibrational bands associated with its formation. The thermal stability of the synthesized nanocomposite was analyzed using Thermogravimetric analysis (TGA) over the temperature range of 30-800 o C. The surface morphology of the synthesized Nd doped BHF/rGO/epoxy resin nanocomposites was examined using scanning electron microscopy (SEM). The microwave absorption characteristics of the undoped and Nd doped BHF/rGO/epoxy resin nanocomposites were evaluated using a vector network analyzer (VNA) in the X-band of microwave frequency (8.2-12.4 GHz). Among the synthesized samples, 3 mm thick Ba 0.80 Nd 0.20 Fe 12 O 19 /rGO-epoxy nanocomposite resulted a minimum reflection loss of -22.2 dB at 10.5 GHz with an effective bandwidth of 2.5 GHz. The remarkable material properties, along with excellent microwave absorption performance, make the nanocomposites promising candidates for electromagnetic shielding and microwave absorption applications.

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Coating of polydimethylsiloxane nanoparticles improves bioactivity of cellulose paper for culture of fibroblasts

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International Journal of Biological Macromolecules 2025年第Pt 4期311卷 143975页

作者： Maparu, Auhin Kumar Singh, Prerana Rai, Beena Sharma, Ashutosh Sivakumar, Sri Physical Sciences Research Area TCS Research Tata Research Development and Design Centre Tata Consultancy Services 54-B Hadapsar Industrial Estate Maharashtra Pune411013 India Department of Chemical Engineering Indian Institute of Technology Kanpur Uttar Pradesh208016 India Department of Biological Sciences and Bioengineering Indian Institute of Technology Kanpur Uttar Pradesh208016 India Material Science Programme Thematic Unit of Excellence on Soft Nanofabrication Centre for Environmental Science & Engineering Mehta Family Centre for Engineering in Medicine Gangwal School of Medical Sciences and Technology Indian Institute of Technology Kanpur Uttar Pradesh208016 India

Paper has recently emerged as a promising platform for cell culture owing to its flexible three-dimensional matrix, high porosity, biocompatibility, cost-effectiveness and widespread availability. However, native paper is devoid of cell adhesion motifs and various surface modification techniques are generally employed on paper substrate before cell seeding, most of which are complicated, expensive, time-consuming and require use of sophisticated instruments. In the present work, for the first time, we have coated polydimethylsiloxane (PDMS) nanoparticles (NPs) onto the cellulose fibers of paper to improve its bioactivity while retaining the fibrous morphology. A modified nanoprecipitation method was employed to prepare PDMS NPs of ~30 nm size and 1 mg/ml concentration. Owing to the inherent skin-like mechanical properties of PDMS, the NPs could offer anchoring sites to the skin cells in the form of nanotopographic and biomechanical cues for enhanced interaction with the paper matrix. NIH/3T3 fibroblast cells cultured on the coated paper substrate exhibited elongated and spindle like morphology (characteristic of fibroblasts in vivo) with an increase in cellular adhesion and proliferation (ca. 74 % more cell viability after 48 h as compared to uncoated paper). After culturing for 15 days, the fibroblasts secreted excessive collagen and formed tissue-like sheet of cells which further advocate for the excellent suitability of the PDMS NPs coated paper substrate for culture of skin cells. © 2025 Elsevier B.V.

关键词： Tissue culture

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A study of electron regeneration efficiency in fluorophore

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materials Today: Proceedings 2020年 29卷 212-217页

作者： N.F. Shaafi S.B. Aziz M.F.Z. Kadird S.K. Muzakir Material Technology Programme Faculty of Industrial Sciences and Technology Universiti Malaysia Pahang Lebuhraya Tun Razak Gambang 26300 Kuantan Pahang Malaysia Advanced Polymeric Materials Research Lab. Department of Physics College of Science University of Sulaimani Qylasan Street Sulaimani Kurdistan Regional Government-Iraq Iraq Department of Civil Engineering College of Engineering Komar University of Science and Technology Sulaimani 46001 Kurdistan Regional Government Iraq Center of Foundation Studies in Science University of Malaya 50603 Kuala Lumpur Malaysia

Archetypical excitonic solar cell consists of fluorophore (main light absorber), photoelectrode (electron transportation), and conducting polymer (electron regeneration). Fluorophore generates excited state electron upon absorption of light with sufficient energy. Electron in the highest occupied molecular orbitals (HOMO) would undergo an excitation to the lowest unoccupied molecular orbitals (LUMO) during the light absorption process. Therefore an electron vacancy in the HOMO of fluorophore is expected; need to be replenished for a continuous process of a photovoltaic mechanism. However the quantum of research on electron regeneration efficiency is still low due to limited computational facility. Two parameters are hypothesized to have significant impact on the electron regeneration process i.e., (i) conductivity ( σ ), and (ii) redox potential ( E o ) of the conducting polymer. This study aims to establish a correlation between the stated parameters with the photovoltaic conversion efficiency, η . Two conducting polymer were used in this work i.e., (i) alginate, and (ii) a mixture of 60 wt% of carboxymethyl cellulose (CMC) and 40 wt% of polyvinyl alcohol (PVA). The conductivity of the conducting polymer was calculated based on the measured bulk resistance using Electrical Impedance Spectrometer (EIS); showed that σ alginate > σ CMC/PVA . The redox potentials were calculated using quantum chemical calculations under the framework of density functional theory (DFT) at the level of b3lyp/lanl2dz. The lead sulphide thin film (fluorophore) was deposited using thermal evaporator on a pre-fabricated TiO 2 layer on indium-doped tin oxide (ITO) conducting glass. The CMC/PVA-based cell yielded the highest η of 0.0015% under one-sun condition; showed higher η than that of the alginate conducting polymer. Therefore concluded that the conductivity would only determine the speed of the electrons during the regeneration. Nonetheless the efficiency of the regeneration process cou

关键词： Efficient electron regeneration CMC/PVA Alginate Redox potential DFT

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Characterization of opto-electronic properties of thermally evaporated ZnO

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materials Today: Proceedings 2020年 29卷 179-184页

作者： F.F.A. Azmi M.F.Z. Kadir Shujahadeen B. Aziz S.K. Muzakir Material Technology Programme Faculty of Industrial Sciences and Technology Universiti Malaysia Pahang Lebuhraya Tun Razak Gambang 26300 Kuantan Pahang Malaysia Center of Foundation Studies in Science University of Malaya 50603 Kuala Lumpur Malaysia Advanced Polymeric Materials Research Lab Department of Physics College of Science University of Sulaimani Qlyasan Street Sulaimani Kurdistan Regional Government-Iraq Iraq Department of Civil Engineering College of Engineering Komar University of Science and Technology Sulaimani 46001 Kurdistan Regional Government Iraq

Photoelectrode plays significant role in excitonic solar cells i.e., (i) as an acceptor and (ii) transport media of excited state electron from the fluorophore upon absorption of energy of photon; which prevents from electron-hole recombination in the fluorophore. The evolution of opto-electronic properties of the ZnO upon change of size, however, receives insufficient attention from researchers. Therefore, the aim of this paper is to establish few realistic clusters of (ZnO) n ( n  = 3, 6, 12, 13, and 21) to study their opto-electronic properties using quantum chemical calculations at the level of B3LYP functional and lanl2dz basis set. Geometry of the clusters were optimized to the lowest energy structures; evaluated as realistic using a combination of harmonic frequency calculations, and experimental works. A device structure of cadmium selenide-based solar cell was used in the study to analyze the energy level alignment, and compatibility of the ZnO realistic clusters.

关键词： DFT Vacuum Thermal Evaporation Photoelectrode ZnO Realistic clusters

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The antibacterial properties of paint with the addition of ZnO nanoparticles

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AIP Conference Proceedings 2024年第1期3001卷

作者： Wulandari Agustin Muhammad Thoriq Albari Muhammad Arya Ghifari Muhammad Raffi Ghifari Devi Purnamasari Riso Sari Mandeli Department of Chemistry Faculty Mathematics and Natural Sciences Universitas Negeri Padang Padang Indonesia Department of Information Technology Faculty of Computer Sciences Universitas Brawijaya Malang Indonesia Department of Radiology Engineering Universitas Awal Bros Pekanbaru Indonesia Environmental Science Postgraduate Programme Universitas Negeri Padang Padang Indonesia Center for Advanced Material Processing Artificial Intelligence and Biophysics Informatics (CAMPBIOTICS) Universitas Negeri Padang Padang Indonesia

The purpose of this study was to see how the antibacterial characteristics of ZnO nanoparticles were applied to wall paint to determine the effectiveness of ZnO nanoparticles in killing bacteria. Where ZnO is one of the metal oxides with good anti-bacterial properties through the formation of ROS. By modifying the percentage of ZnO nanoparticles used, namely 3%, 5%, 10%, and 15%, and 0% as a blank or comparison. Antibacterial properties were obtained through evaluation using the TPC method which stands for Total Plate Count. ZnO nanoparticles were obtained by synthesizing using the precipitation method. ZnO nanoparticles were characterized using XRD Instruments to analyze the morphological structure.

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Effect of adding CuO as antibacterial to Portland cement

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AIP Conference Proceedings 2024年第1期3001卷

作者： Rida Oppi Ramadhani Muhammad Thoriq Albari Muhammad Arya Ghifari Muhammad Raffi Ghifari Devi Purnamasari Riso Sari Mandeli Department of Chemistry Faculty Mathematics and Natural Sciences Universitas Negeri Padang Padang Indonesia Department of Information Technology Faculty of Computer Sciences Universitas Brawijaya Malang Indonesia Department of Radiology Engineering Universitas Awal Bros Pekanbaru Indonesia Environmental Science Postgraduate Programme Universitas Negeri Padang Padang Indonesia Center for Advanced Material Processing Artificial Intelligence and Biophysics Informatics (CAMPBIOTICS) Universitas Negeri Padang Padang Indonesia

This research uses Escherichia coli bacteria as the model bacteria to assess the efficacy of adding CuO nanoparticles as an antibacterial agent to Portland cement. The disc diffusion technique is used to assess antibacterial characteristics. Where in humid environmental conditions can trigger health problems in the community in the neighborhood where they live. CuO was added to Portland Cement at different rates of 0%, 1%, 3%, and 5% (%w/w) to conduct the assessment. To achieve a perfect dispersion, the nanoparticles were then combined with water using an ultrasonic mixer before being added to the cement. Additionally, characterisation was performed using XRD in order to establish the size of the CuO nanoparticles and the type of crystal that was generated. SEM was used for morphological investigation and characterisation oof Cement-CuO. The ensuing clear zone, which shows the region where bacterial growth was inhibited, serves as a visual indicator of antibacterial efficacy. The results showed that to produce the best antibacterial effectiveness is with a variation in the addition of CuO as much as 3% which results in a size of 7 mm in the diameter of the inhibitory zone. The presence of resistance power indicates that the resulting antibacterial cement shows an effect on the growth of Escherichia coli bacteria.

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MgO’s effect on wall paint’s antibacterial properties

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AIP Conference Proceedings 2024年第1期3001卷

作者： Sintia Noveliza Muhammad Thoriq Albari Muhammad Arya Ghifari Muhammad Raffi Ghifari Devi Purnamasari Riso Sari Mandeli Department of Chemistry Faculty Mathematics and Natural Sciences Universitas Negeri Padang Padang Indonesia Department of Information Technology Faculty of Computer Sciences Universitas Brawijaya Malang Indonesia Department of Radiology Engineering Universitas Awal Bros Pekanbaru Indonesia Environmental Science Postgraduate Programme Universitas Negeri Padang Padang Indonesia Center for Advanced Material Processing Artificial Intelligence and Biophysics Informatics (CAMPBIOTICS) Universitas Negeri Padang Padang Indonesia

In this study, antibacterial properties were tested with the paint used, namely Wall Paint and Escherichia coli bacteria as test bacteria. Bacterial testing was carried out using the Disc Diffusion method, the test was carried out with variations of MgO on Wall Paint, namely 0%, 1%, 3%, 5%, and 100% for positive control as well as variations in incubation time, namely 1 day, 2 days, and 3 days where the test came from the active ROS (Reactive Oxygen Species) in MgO. Besides that, it is necessary to characterize with XRD which aims to determine the size of the nanoparticles of MgO and the crystal structure formed, also do characterization with XRF to determine the chemical composition and concentration of elements in the sample, in addition to characterization with SEM to determine the surface morphology structure samples at 1,500x, 5,000x, and 10,000x magnifications.

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Human Health Hazards: Planar Resonant Carbon Nano Tube Coated Metamaterial Inspired Gas sensor

Human Health Hazards: Planar Resonant Carbon Nano Tube Coate...

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IEEE MTT-S International Microwave and RF Conference

作者： Nilesh K Tiwari P Azad Sandeep K Singh Surya P Singh M. Jaleel Akhtar Department of Electrical Engineering Indian Institute of Technology Kanpur India Microwave Imaging and Material Testing Laboratory Materials Science Programme Indian Institute of Technology Kanpur India

ISBN: (数字)9781728140407

ISBN: (纸本)9781728140414

The design and implementation of Metamaterial inspired planar resonant structure coated with the nanostructured carbon nanotube (CNT) is carried out to detect the presence of hazardous gases viz., acetone, and toluene. A modified design topology consisting of center etched circular slot along with the asymmetrically ground etched circular complementary split ring resonator (CSRR). The designed sensor is found to be quite sensitive toward the human health-hazardous gases, including toluene and acetone gases. A controlled experimental gas sensing setup is used to perform the real-time monitoring of an arbitrary gas concentration at room temperature (25 0 C) with RH 32%. The measured sensing performances revealed that CNT--MCSRR sensor is capable to detect hazardous gases present in the environment as it exhibited large S21 frequency shift of 370 MHz @ 350 ppm and 170 MHz @ 300 ppm for acetone and toluene, respectively.

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Green synthesis of Au on ZnO (Au/ZnO) nanoparticles using Ocimum americanum leaf extract: Nature changes of optic, structure, and morphology

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AIP Conference Proceedings 2021年第1期2381卷

作者： Iwan Syahjoko Saputra Shifa Dwi Koesumahelmi Yoki Yulizar Sudirman 1Study Programme of Cosmetic Technology Department of Science and Technology Sumatera Institute of Technology South lampung 35365 Indonesia 2Department of Chemistry Faculty of Mathematics and Natural Science University of Indonesia Depok 16424 Indonesia 3Center for Science & Technology of Advanced Material - National Nuclear Energy Agency of Indonesia BATAN Kawasan PUSPIPTEK Gd. 71 Tangerang Selatan Banten 15314 Indonesia

Green synthesis of Au on ZnO nanoparticles surface were successfully prepared using Ocimum americanum leaf extract. The reaction was carried out at room temperature using the green synthesis method. The nature changes of optic, structure, and morphology of Au on ZnO nanoparticles surface were characterized using UV-vis diffuse reflectance spectroscopy (UV-Vis DRS), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Scanning electron microscopy (SEM), and Energy-dispersive X-ray spectroscopy (EDS). UV-vis DRS showed the change of optical properties and the band gap energy values of ZnO and Au/ZnO nanoparticles from 3.21 eV to 3.09 eV. Analysis of FTIR showed the decrease of absorption peak in functional group of -OH, C=C, moreover there is a shift in C-C absorption peak and strong vibration of Zn-O-Au which occurred at wavenumber of 519 cm−1. XRD showed the crystallite size average of ZnO and Au/ZnO is 65.78 nm and 81.99 nm. SEM showed the morphology of Au/ZnO is sphere. EDX shows the mass percent of element composition for Au, Zn, and O is 2.28, 75.50, and 16.11. From the existed data, can be concluded the presence of gold greatly affects to optical properties, structure, and morphology of ZnO nanoparticles surface.

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