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Characterisation and assessment of two green aging methods for silver mock-up systems using multi-analytical techniques

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The European Physical Journal Plus 2025年第6期140卷 548-548页

作者： Qing Wu Kirill Gubanov Han Zhou Ivan Marozau Arianna Passaretti Jorge Gonzalez Frutos Christian Degrigny Loïc Bertrand Maartje Stols-Witlox Laura Brambilla Edith Joseph Haute Ecole Arc Conservation-Restauration University of Applied Sciences and Arts of Western Switzerland Neuchâtel Switzerland Department Chemie und Pharmazie Lehrstuhl für Physikalische Chemie II Friedrich-Alexander-Universität Erlangen-Nürnberg Erlangen Germany Programme Conservation and Restoration of Cultural Heritage University of Amsterdam Amsterdam The Netherlands Swiss Centre for Electronics and Microtechnology Neuchâtel Switzerland Institute of Chemistry University of Neuchâtel Neuchâtel Switzerland Department of Advanced Materials and Surfaces Swiss Federal Laboratories for Materials Science and Technology Dübendorf Switzerland Photophysique et Photochimie Supramoléculaires et Macromoléculaires Université Paris-Saclay ENS Paris-Saclay CNRS Gif-sur-Yvette France

Due to the high values of historical silver artefacts, artificially aged mock-ups are often used for the development of conservation concepts and treatments in the field of conservation and heritage study. However, some chemicals used in recent aging methods have the risks of being toxic and environmentally harmful. We have tested and improved green aging protocols based respectively on boiled egg white and albumin solution on both sterling silver and pure silver coupons. The artificially created tarnish layers on the coupons showed high homogeneity and reproducibility. We identified the successive phases formed on the sterling silver coupons during the aging process with albumin solution through X-ray diffraction analysis: (1) stromeyerite (AgCuS), (2) coexistence of stromeyerite, jalpaite (Ag3CuS2) and sub-sulphide (Ag8S), (3) intermediate phases progressing towards Ag and Cu sulphides. Raman spectroscopy confirmed that adapting the quantity of reagents and exposure time during the aging process resulted in tarnish composition close to that observed on naturally tarnished reference objects. Changes in the surface morphology of the coupons were monitored by optical microscopy and scanning electron microscopy. While sulphidation dominated the tarnishing process, we observed that albumin solution aged samples showed an initial predominance of oxidation. Surface microstructures consisting of islands or rings of various sizes were observed on several albumin solution aged coupons. Measurements via Kelvin probe force microscopy and atomic force microscopy showed that the formation of these structures was linked to the accumulation of corrosion products.

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Kinetic study of 131I extraction using oil palm kernel shell activated carbon for clinical nuclear waste management

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AIP Conference Proceedings 2022年第1期2454卷 060026页

作者： Mohammad Khairul Azhar Abdul Razab Norazlina Mat Nawi Ahmad Thaifur Khaizul Noryasmin Yusrina Samsuddin Syabil Irfan Shukri Maizatul Ainie Azhar Ilyana Ab Aziz An’amt Mohamed Noor Nor Hakimin Abdullah Zulhisyam Abdul Kari Medical Radiation Programme School of Health Sciences Universiti Sains Malaysia Health Campus 16150 Kubang Kerian Kelantan Malaysia Department of Nuclear Medicine Radiotherapy & Oncology School of Medical Sciences Universiti Sains Malaysia Health Campus 16150 Kubang Kerian Kelantan Malaysia Advanced Materials Research Cluster Faculty of Bioengineering and Technology Universiti Malaysia Kelantan Jeli Campus Jeli Kelantan 17600 Malaysia Faculty of Agro-Based Industry Universiti Malaysia Kelantan Jeli Campus Jeli Kelantan 17600 Malaysia

Nuclear medicine is one of the facilities that provide diagnostic and treatment services to patients using radioactive materials. The use of liquid radioactive materials like 131I increases the radiological hazard to staff and patients, either by spillage or poor management of clinical wastewater. Hence, proper, reliable, economical, and safe contamination management of radioactive materials is an important aspect to be considered for routine radiation protection practice in hospitals. This study proposed a new technique for radioactive contamination management using oil palm kernel shell activated carbon (OPKSAC). Pure 131I from the laboratory was mixed with different concentrations of OPKSAC. The mixture was filtered to obtain sediment and water residue. A kinetic radioactivity study was conducted using a dose calibrator on the sediment and water residue by varying the activated carbon concentrations. The measurement was repeated on the 4th, 8th, 12th, and 16th day of radionuclide decay. Field emission scanning electron microscopy (FESEM) and energy dispersive X-ray (EDX) were used to analyze the morphology and elemental analysis of the sediment obtained after filtration for 350 mg/mL concentration. The OPKSAC has a high potential to accelerate the decay of 131I by agglomeration and solidify the radionuclide. The results from FESEM and EDX analysis show the morphology structure of agglomeration between 131I on the activated carbon surface, where the presence of Na element proved the reaction of the radioactive solution used in this experiment.

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Mesoporous Silica Nanoparticles and Waste Derived-Siliceous Materials for Doxorubicin Adsorption and Release

Mesoporous Silica Nanoparticles and Waste Derived-Siliceous ...

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2018 International Conference on Chemical Sciences and Engineering: Advance and New Materials, ICCSE 2018

作者： Adira Jaafar, Jafreena Hidayatul Nazirah Kamarudin, Nur Dina Setiabudi, Herma Najiha Timmiati, Sharifah Lee Peng, Teh Chemical Engineering Programme Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Bangi Selangor43600 UKM Malaysia Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Bangi Selangor43600 UKM Malaysia Faculty of Chemical and Natural Resources Engineering Universiti Malaysia Pahang Lebuhraya Tun Razak Gambang Kuantan Pahang26300 Malaysia Universiti Kebangsaan Malaysia Bangi Selangor43600 UKM Malaysia Centre for Advanced Materials and Renewable Resources Faculty of Science and Technology Universiti Kebangsaan Malaysia Bangi Selangor43600 UKM Malaysia

Mesoporous silica nanoparticles (MSN) have been widely used for the drug delivery system due to their unique properties such as porous structure, high and tailorable internal and external surface area, as well as functionalizable surface. Due to the abundance of rice husk ash waste (RHA), extensive research had been conducted to convert these wastes to a useful resources. As RHA had been reported to contain high silica content (96.34%), it was seen as potential adsorbent as other silica materials. In this study, we have synthesized nano-silica materials from RHA (RHA-silica) to compare the potential of this waste-derived material with MSN for drug delivery application. RHA-silica was applied to the adsorption and release of model anti-cancer drugs, doxorubicin, and the performance was compared with the synthesized mesoporous silica nanoparticles (MSN). The characterization of the material was also compared and it was observed that the adsorption of doxorubicin was 65% on RHA-silica and MSN was 79.5% and 90.8%, while the total release percentage was 30.7% and 48.8%, respectively. From the result, it is expected that the waste-derived silica material could be further modified and optimized for the drug delivery application, as well as the appropriate modification and functionalization to suite the need for adsorption and release of drugs, but with lower cost and significant contribution to a greener chemistry. © 2019 Elsevier Ltd.

关键词： Adsorption

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Extraction of 131I from radioactive spillage using coconut shell activated carbon in nuclear medicine

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AIP Conference Proceedings 2022年第1期2454卷

作者： Mohammad Khairul Azhar Abdul Razab Norazlina Mat Nawi Ahmad Thaifur Khaizul Fara Hana Mohd Hadzuan Syabil Irfan Shukri Maizatul Ainie Azhar Noryasmin Yusrina Samsuddin An’amt Mohamed Noor Nor Hakimin Abdullah Zulhisyam Abdul Kari 1Medical Radiation Programme School of Health Sciences Universiti Sains Malaysia Health Campus 16150 Kubang Kerian Kelantan Malaysia 2Department of Nuclear Medicine Radiotherapy & Oncology School of Medical Sciences Universiti Sains Malaysia Health Campus 16150 Kubang Kerian Kelantan Malaysia 3Advanced Materials Research Cluster Faculty of Bioengineering and Technology Universiti Malaysia Kelantan Jeli Campus Jeli Kelantan 17600 Malaysia 4Faculty of Agro-Based Industry Universiti Malaysia Kelantan Jeli Campus Jeli Kelantan 17600 Malaysia

This study was carried out to examine the ability of activated carbon (AC) prepared from coconut shell to extract iodine-131 (131I) from the radioactive spillage in nuclear medicine. The extraction of 131I radionuclides was conducted in batch experiments. The effect of coconut shell activated carbon (CSAC) concentrations on the 131I decay rate was investigated using a dose calibrator. The concentrations of CSAC used were 50, 100, 150, 200, 250, 300, and 350 mg/mL. The surface morphology of CSAC in this study was characterized using field emission scanning electron microscopy (FESEM). There was a significant relationship between the concentrations of CSAC and the radioactivity of 131I. A higher CSAC concentration accelerated the decay rate of radionuclides via agglomeration and solidification. The FESEM micrograph shows that the adsorption capability of CSAC increased with concentrations as more randomized nanopores existed on the AC flakes, hence providing a high total surface area.

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Improving microstructural homogeneity and reducing grain size of Zn-3Mg alloy through ECAP

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AIP Conference Proceedings 2023年第1期2643卷

作者： M. S. Dambatta S. Izman S. T. Auwal D. Kurniawan S. Ramesh U. Abdullahi H. Mas Ayu A. Shah A. Y. Gidado Auwal Ibrahim Musa Alhaji Ibrahim 1Faculty of Engineering Department of Mechanical Engineering Kano University of Science and Technology Wudil 3244 Kano State Nigeria 2Faculty of Mechanical Engineering Universiti Teknologi Malaysia Skudai 81310 Malaysia 3Mechanical Engineering Programme Area Universiti Teknologi Brunei Gadong 1410 Brunei Darussalam 4Faculty of Engineering Universiti Teknologi Brunei Tungku Highway Gadong BE1410 Brunei Darussalam 5Center of Advanced Manufacturing and Material Processing Department of Mechanical Engineering Faculty of Engineering University of Malaya 50603 Kuala Lumpur Malaysia 6Department of Mechanical Engineering Faculty of Engineering Ahmadu Bello University Zaria Nigeria 7Faculty of Mechanical and Automotive Engineering Technology Universiti Malaysia Pahang 26600 Pekan Pahang Malaysia 8Faculty of Technical and Vocational Universiti Pendidikan Sultan Idris 35900 Tanjong Malim Perak Malaysia

Recently, Zn and its alloys have been investigated due to its lower degradation rate than that of Mg-based alloys. However, it as-cast grainsize and microstructure homogeneity still required further enhancement. This research works aims to improve these properties on eutectic Zn-3Mg alloy via equal channels angular pressing (ECAP). Cast Zn-3Mg sample was heat treated at 370°C for 15hrs and quenched in water before ECAP processing at temperature of 200°C. Results revealed that, heat treatment followed by ECAP was effective in reducing the grain size of the as-cast alloy to 2 µm from 48 µm after 2-passes. This two-step processing remarkably increases the sample microstructure homogeneity. The study revealed that heat treatment followed by 2-ECAP passes was beneficial in enhancing the mechanical properties and degradation behaviour of Zn3Mg alloy as potential use for biodegradable implants material.

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Correction to: Nos2-/- mice infected with M. tuberculosis develop neurobehavioral changes and immunopathology mimicking human central nervous system tuberculosis

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Journal of neuroinflammation 2022年第1期19卷 197页

作者： Xuan Ying Poh Jia Mei Hong Chen Bai Qing Hao Miow Pei Min Thong Yu Wang Ravisankar Rajarethinam Cristine S L Ding Catherine W M Ong Infectious Diseases Translational Research Programme Department of Medicine Yong Loo Lin School of Medicine National University of Singapore 10th floor Tower Block 1E Kent Ridge Road Singapore 119228 Singapore. Advanced Molecular Pathology Laboratory Institute of Molecular and Cell Biology Agency for Science Technology and Research (A*STAR) Singapore Singapore. Department of Pathology Tan Tock Seng Hospital Singapore Singapore. Infectious Diseases Translational Research Programme Department of Medicine Yong Loo Lin School of Medicine National University of Singapore 10th floor Tower Block 1E Kent Ridge Road Singapore 119228 Singapore. Catherine_wm_ong@nuhs.edu.sg. Division of Infectious Diseases Department of Medicine National University Hospital Singapore Singapore. Catherine_wm_ong@nuhs.edu.sg. Institute for Health Innovation and Technology (iHealthtech) National University of Singapore Singapore Singapore. Catherine_wm_ong@nuhs.edu.sg.

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Physical, Structural, and Raman Spectroscopic Traits of Neodymium-Doped Lead Oxyfluoride Zinc Phosphate Glass

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Journal of Physics: Conference Series 2021年第1期1892卷

作者： N Y M Isa E S Sazali R Hisam S K Ghoshal S K M Zain N H Juma'in S N S Yaacob Z A S Mahraz A N Harun F M Noor M R Sahar K A Samah M S Aziz A A Salim A Awang Advanced Optical Materials Research Group Department of Physics Faculty of Science Universiti Teknologi Malaysia Skudai 81310 Johor Malaysia. Faculty of Applied Sciences Universiti Teknologi MARA 40450 Shah Alam Selangor Malaysia Department of Physics College of Education-Zulten University of Sabratha Libya. Department of Management of Technology International Institute of Technology (MJIIT) Malaysia-Japan. Laser Center Ibnu-Sina Institute for Scientific and Industrial Research (ISI-SIR) Universiti Teknologi Malaysia Physics with Electronics Programme Faculty of Science and Natural Resources Universiti Malaysia Sabah

Nd3+ with composition of (60 - x) P2O5 - 10ZnO - 30PbF2 - (x) Nd2O3 where (0.0 ≤ x ≤ 2.0 mol %) was prepared using a melt-quenching approach to the development of transparent glasses. These glasses have been confirmed to be an amorphous structure through XRD analysis. The glass density, molar volume and ionic packing density were obtained in the range of 3.978-4.157 g cm−3, 41.949 - 41.073 cm3 mol−1 and 0.614-0.624, respectively. Using Fourier Transform Infrared (FTIR) and Raman Spectroscopy, the chemical functional groups and biomolecules of samples were characterised. The FTIR spectra revealed six main bands assigned to P-O, P-O-P, P=O, (PO3)2- and hydroxyl groups (O-H), while Raman shift detected five symmetric and asymmetric bands attributed to P-O-P bonds in Q1 units, (PO4)3- bonds in Q0 units, (PO3)2- bonds in Q1 units, (PO2)− bonds in Q2 units and P=O bonds in Q3 units. It is believed that the proposed oxyfluoride glasses may be useful and suitable applicant to lasing materials and sensors sensitivity.

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The second data release from the European Pulsar Timing Array: III. Search for gravitational wave signals

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ASTRONOMY & ASTROPHYSICS 2023年 678卷

作者： [Anonymous] Department of Physics Indian Institute of Technology Roorkee Roorkee 247667 India Department of Electrical Engineering IIT Hyderabad Kandi Telangana 502284 India Université Paris Cité CNRS Astroparticule et Cosmologie 75013 Paris France The Institute of Mathematical Sciences C. I. T. Campus Taramani Chennai 600113 India Homi Bhabha National Institute Training School Complex Anushakti Nagar Mumbai 400094 India Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 53121 Bonn Germany Fakultät für Physik Universität Bielefeld Postfach 100131 33501 Bielefeld Germany ASTRON Netherlands Institute for Radio Astronomy Oude Hoogeveensedijk 4 7991 PD Dwingeloo The Netherlands Department of Physical Sciences Indian Institute of Science Education and Research Mohali Punjab 140306 India Laboratoire de Physique et Chimie de l’Environnement et de l’Espace Université d’Orléans/CNRS 45071 Orléans Cedex 02 France Observatoire Radioastronomique de Nançay Observatoire de Paris Université PSL Université d’Orléans CNRS 18330 Nançay France Dipartimento di Fisica “G. Occhialini” Universitá degli Studi di Milano-Bicocca Piazza della Scienza 3 20126 Milano Italy INFN Sezione di Milano-Bicocca Piazza della Scienza 3 20126 Milano Italy INAF – Osservatorio Astronomico di Brera via Brera 20 20121 Milano Italy Institute for Gravitational Wave Astronomy and School of Physics and Astronomy University of Birmingham Edgbaston Birmingham B15 2TT UK INAF – Osservatorio Astronomico di Cagliari via della Scienza 5 09047 Selargius (CA) Italy Hellenic Open University School of Science and Technology 26335 Patras Greece Institute of Astrophysics FORTH N. Plastira 100 70013 Heraklion Greece Kavli Institute for Astronomy and Astrophysics Peking University Beijing 100871 PR China Department of Astronomy and Astrophysics Tata Institute of Fundamental Research Homi Bhabha Road Navy Nagar Colaba Mumbai 400005

We present the results of the search for an isotropic stochastic gravitational wave background (GWB) at nanohertz frequencies using the second data release of the European Pulsar Timing Array (EPTA) for 25 millisecond pulsars and a combination with the first data release of the Indian Pulsar Timing Array (InPTA). A robust GWB detection is conditioned upon resolving the Hellings-Downs angular pattern in the pairwise cross-correlation of the pulsar timing residuals. Additionally, the GWB is expected to yield the same (common) spectrum of temporal correlations across pulsars, which is used as a null hypothesis in the GWB search. Such a common-spectrum process has already been observed in pulsar timing data. We analysed (i) the full 24.7-year EPTA data set, (ii) its 10.3-year subset based on modern observing systems, (iii) the combination of the full data set with the first data release of the InPTA for ten commonly timed millisecond pulsars, and (iv) the combination of the 10.3-year subset with the InPTA data. These combinations allowed us to probe the contributions of instrumental noise and interstellar propagation effects. With the full data set, we find marginal evidence for a GWB, with a Bayes factor of four and a false alarm probability of 4%. With the 10.3-year subset, we report evidence for a GWB, with a Bayes factor of 60 and a false alarm probability of about 0.1% (greater than or similar to 3 sigma significance). The addition of the InPTA data yields results that are broadly consistent with the EPTA-only data sets, with the benefit of better noise modelling. Analyses were performed with different data processing pipelines to test the consistency of the results from independent software packages. The latest EPTA data from new generation observing systems show non-negligible evidence for the GWB. At the same time, the inferred spectrum is rather uncertain and in mild tension with the common signal measured in the full data set. However, if the spectral index is

关键词： gravitational waves methods: data analysis pulsars: general

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Mesoporous Silica Nanoparticles and Waste Derived-Siliceous Materials for Doxorubicin Adsorption and Release

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Materials Today: Proceedings 2019年 19卷 1420-1425页

作者： Jafreena Adira Jaafar Nur Hidayatul Nazirah Kamarudin Herma Dina Setiabudi Sharifah Najiha Timmiati Teh Lee Peng Research Centre for Sustainable Process Technology (CESPRO) Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia 43600 UKM Bangi Selangor Malaysia Chemical Engineering Programme Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia 43600 UKM Bangi Selangor Malaysia Faculty of Chemical & Natural Resources Engineering Universiti Malaysia Pahang Lebuhraya Tun Razak 26300 Gambang Kuantan Pahang Malaysia Fuel Cell Institute (SELFUEL) Universiti Kebangsaan Malaysia 43600 UKM Bangi Selangor Malaysia Centre for Advanced Materials and Renewable Resources Faculty of Science and Technology Universiti Kebangsaan Malaysia 43600 UKM Bangi Selangor Malaysia

关键词： mesoporous silica siliceous material rice husk ash doxorubicin drug adsorption drug release

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Digital Photonic Even Parity Bit Generator

Digital Photonic Even Parity Bit Generator

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IEEE Photonics Conference (IPC)

作者： F. K. Lawl M. Rakib Uddn Nur Musyiirah Masir Yong Hyub Won Electrical and Electronic Engineering Programme Area Faculty of Engineering Universiti Teknoloai Brunei (UTB) Gadong Brunei Darussalam Electrical and Electronic Engineering Programme Area Faculty of Engineering Universiti Teknologi Brunei (UTB) Gadong Brunei Darussalam Korea Advanced Institute of Science and Technology Daejeon Daejeon KR

This paper presents the novel design of a digital photonic even parity bit generator based on a single photonic micro-ring resonator. This work provides the operational principle of the proposed circuit, with its inputs are the electrical signals being fed into the micro-ring resonator, and the optical signal output is taken from the ring drop port. Time varying simulation at the data rate of 10 Gbps have been tested, resulting in clear output timing diagram of the generated parity bit.

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