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3rd International Symposium on Physics and Applications 2023, ISPA 2023

作者： Agustin, A.D. Asih, R. Arifin, R. Darminto Department of Physics Faculty of Science and Data Analytics Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Department of Mechanical Engineering Faculty of Engineering Universitas Muhammadiyah Ponorogo 63471 Indonesia

Graphene is a two-dimensional material that has special characteristics. The electronic properties of graphene show zero band gap conditions. The magnetic properties of graphene can be created by modifying the electronic properties through atomic substitution. In this research, we study the magnetic and electronic properties of single-layer graphene substituted with boron (B) atoms, because it has almost the same atomic radius as carbon (C) atoms, resulting in only small lattice deformation. The spin-polarized density functional theory (DFT) method implemented in the Quantum Espresso package was selected to perform the calculations. The simulated models are a 4×4×1 supercell of pristine graphene structure consisting of 32 C atoms and boron-substituted graphene with a variety number of atoms (B = 1 and 2 atoms). The results of band gap energy obtained after the structure was optimized are 0.19 and 0.21 eV (spin-down and spin-up) for G-B and 0.36 and 0.37 eV (spin-down and spin-up) for G-2B. Boron substitution in graphene opens the bandgap and shifts the Fermi energy level. It also influences the magnetic moment of the graphene layer, estimated at 0.22 and 0.06 μB/cell for G-B and G-2B, respectively. This research shows that modifying graphene by substituting boron makes the graphene material semiconductive and weakly magnetic. © Published under licence by IOP Publishing Ltd.

关键词： Graphene

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Effect of N doping on Electronic Band Structure and Magnetic Moments in Graphene Sheets: Density Functional Theory Study 3

Effect of N doping on Electronic Band Structure and Magnetic...

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3rd International Symposium on Physics and Applications 2023, ISPA 2023

作者： Nenohai, A.J.W.T. Santana, F.M. Asih, R. Arifin, R. Darminto Department of Physics Faculty of Science and Data Analytics Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Department of Mechanical Engineering Faculty of Engineering Universitas Muhammadiyah Ponorogo Ponorogo63471 Indonesia

Graphene has become a material that is often discussed recently because of its unique properties. One of the obstacles in using graphene as a nanoelectronic device is its zero band gap energy. One effort that can be made to open this energy gap is by substituting N atoms. In this research, spin-polarization density functional theory is studied. We simulated 4 x 4 single-layer graphene supercells with varying numbers of N atom substitutions (N = 0, 1, 2 atoms). The GGA - PBE function is used in this modeling to complement the exchange - correlation potential. The result obtained is an open energy band gap when the Nitrogen atom is substituted. Nitrogen substituted in the form of graphite - N also causes the emergence of a magnetic moment in graphene, with a Fermi energy value for pristine graphene of -0.4607 eV, for G1N of -1.6140 eV, and for G2N of -1.3346 eV. These results pave the way for research and development of graphene in its application as electronic nanodevices. © Published under licence by IOP Publishing Ltd.

关键词： Graphene

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Overview of novel nanobiosensors for electrochemical and optical diagnosis of leukemia:Challenge and opportunity

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Journal of Innovative Optical Health sciences 2024年第4期17卷 116-138页

作者： Ulya Farahdina Tahta Amrillah Mashuri Mashuri Vannajan Sanghiran Lee Agus Rubiyanto Nasori Nasori Laboratory Medical Physics and Biophysics Department of Physics Faculty of Sciences and Data AnalyticInstitut Teknologi Sepuluh Nopember Surabaya 60111Indonesia Nanotechnology Engineering Faculty of Advanced Technology and Multidiscipline Universitas AirlanggaSurabaya 60115Indonesia Department of Industrial Mechanical Engineering Institut Teknologi Sepuluh Nopember Surabaya 60111 Indonesia Department of Chemistry Faculty of Science University of Malaya Kuala Lumber 50603Malaysia

Leukemia is one of the ten types of cancer that causes the biggest death in the *** to other types of cancer,leukemia has a low life expectancy,so an early diagnosis of the cancer is necessary.A new strategy has been developed to identify various leukemia biomarkers by making blood cancer biosensors,especially by developing nanomaterial applications so that they can improve the performance of the *** many biosensors have been developed,the detection of leukemia by using nanomaterials with electrochemical and optical methods is still less carried out compare to other types of cancer *** the acoustic and calorimetric testing methods for the detection of leukemia by utilizing nanomaterials have not yet been carried *** of the reviewed works reported the use of gold nanoparticles and electrochemical characterization methods for leukemia detection with the object of study being conventional cancer *** order to be used clinically by the community,future research must be carried out with a lot of patient blood objects,develop non-invasive leukemia detection,and be able to detect all types of blood cancer specifically with one *** can lead to a fast and accurate diagnosis thus allowing for early treatment and easy periodic condition monitoring for various types of leukemia based on its biomarker and future design controlable via internet of things(IoT)so that why would be monitoring real times.

关键词： Biosensor detection leukemia nanomaterial IoT

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Electronic and magnetic properties of single vacancy graphene with hydrogen adsorptions analyzed using density functional theory method 1

Electronic and magnetic properties of single vacancy graphen...

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1st International Symposium on Physics and Applications, ISPA 2020

作者： Septya, Maya Mahirotul Asih, Retno Arifin, Rizal Darminto Department of Physics Faculty of Science and Data Analytics Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Department of Mechanical Engineering Faculty of Engineering Universitas Muhammadiyah Ponorogo 63471 Indonesia

Graphene has become an exciting material to be studied because of its unique properties. One of the interesting phenomena is the change of its electronic and magnetic properties due to impurities adsorption. By using the spin-polarized density functional theory (DFT) method, we simulate single vacancy graphene with the adsorption of hydrogen atoms around the dangling bond to determine the electronic and magnetic properties of the material. In this study, we use a 4×4×1 supercell of single-layered graphene. We have four models, i.e., single vacancy graphene, and graphene with hydrogen adsorption in the dangling bond site with the atom's variation number (H = 1, 2, 3 atoms). Our results show that the modifications of graphene in the form of single vacancy and hydrogen adsorptions makes the graphene material metal, except for the SV+2H model which shows a semiconductor characteristic. The presence of a single vacancy affects the magnetic moment of the modeled graphene layer. A single vacancy on the modeled graphene layer results in a total magnetic moment of 0.69 µB/cell. In the single vacancy graphene with three hydrogen atoms adsorption, we acquire the total magnetic moment of 0.15 µB/cell. This study shows that defects in the forms of vacancies and adsorption of hydrogen atoms can initiate magnetism on graphene. These results open a way of using graphene to create nanomagnetic devices. © Published under licence by IOP Publishing Ltd.

关键词： Graphene

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Effect of vacancy defects on electronic band structure and magnetic moment of single-layered graphene: A density functional theory study 1

Effect of vacancy defects on electronic band structure and m...

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1st International Symposium on Physics and Applications, ISPA 2020

作者： Yusran, L.O. Asih, R. Arifin, R. Darminto Department of Physics Faculty of Science and Data Analytics Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Department of Mechanical Engineering Faculty of Engineering Universitas Muhammadiyah Ponorogo Ponorogo63471 Indonesia

In the present work, the density functional theory is used to study the electronic band structure and magnetic moment of single-layered pristine graphene and graphene with vacancy defects. The 4x4x1 supercell graphene consisting of 32 C atoms is used as pristine graphene (PG) and made the structure with a single vacancy (1V) and double vacancies (2V). The results show that the Dirac cone that exists in pristine graphene disappears in the graphene with vacancies. The DOS of spin up and down electrons in graphene with vacancies shows a mismatch, which is due to unpaired electrons. Vacancy defects also cause the presence of states at the Fermi level, which are not found in pristine graphene. Then, the double vacancies have a higher magnetic moment value than the single vacancy. © Published under licence by IOP Publishing Ltd.

关键词： Graphene

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Effectiveness of a fish scales-derived chitosan coating for corrosion protection of carbon steel

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Egyptian Journal of Petroleum 2022年第1期31卷 25-31页

作者： Gapsari, Femiana Hidayatullah, Syarif Hadi Setyarini, Putu Madurani, Kartika A. Hermawan, Hendra Department of Mechanical Engineering Faculty of Engineering Brawijaya University MT Haryono 167 Malang 65145 Indonesia Laboratory of Instrumentation and Analytical Sciences Chemistry Department Faculty of Science and Data Analytics Institut Teknologi Sepuluh Nopember Arief Rahman Hakim Surabaya 60111 Indonesia Department of Mining Metallurgical and Materials Engineering Laval University Quebec City G1V 0A6 Canada

Many naturally-derived organic coating has been proposed for corrosion protection of carbon steel, but its effectiveness is challenged by poor coating adhesion. In this work, chitosan was extracted from Nila tilapia fish scales and coated onto ASTM A36 carbon steel surface by using electrophoretic deposition (EPD) and dip coating (DC) techniques. The work aims at determining the coating technique and process parameters that result in effective corrosion protection of carbon steel in acid solution. The effectiveness of corrosion protection was determined by calculating inhibition efficiency from corrosion parameters obtained by polarization test and electrochemical impedance spectroscopy. Results showed that each coating technique provides different mechanism of corrosion protection. The DC-made coating showed a physisorption mechanism where the steel's corrosion rate increases as the temperature increased. The EPD-coated specimens demonstrated a chemisorption mechanism with its minor change in corrosion rates than those of DC-coated specimens. The DC technique resulted in a higher inhibition (73 %) efficiency and lower corrosion rate than that of EPD (41 %) with some degree of stability over increasing temperature. © 2022 Egyptian Petroleum Research institute

关键词： Chitosan Corrosion Dip coating Electrophoretic deposition Fish scale Organic coating

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Corrigendum to "Enhancing mechanical and thermal properties of bio-composites: Synergistic integration of ZnO nanofillers and nanocrystalline cellulose into durian seed starch matrix" [Int. J. Biol. Macromol. 290 (2025) 138571] (International Journal of Biological Macromolecules (2025) 290, (S0141813024093826), (10.1016/***.2024.138571))

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International Journal of Biological Macromolecules 2025年 308卷 142610页

作者： Gapsari, Femiana Andrianto, Sis Nanda Kus Harmayanti, Afifah Sulaiman, Abdul Mudjib Kartikowati, Christina Wahyu Madurani, Kartika A. Wijayanti, Widya Rangappa, Sanjay Mavinkere Siengchin, Suchart Department of Mechanical Engineering Faculty of Engineering Brawijaya University MT Haryono 167 Malang65145 Indonesia Department of Mechanical Engineering Faculty of Engineering State University of Malang Semarang 5 Malang65145 Indonesia Department of Chemical Engineering Faculty of Engineering Brawijaya University MT Haryono 167 Malang65145 Indonesia Department of Chemistry Faculty of Science and Data Analytics Institut Teknologi Sepuluh Nopember Arief Rahman Hakim Surabaya60111 Indonesia Bangkok10800 Thailand

The authors regret . The authors would like to apologise for any inconvenience caused.[Figure presented] Fig. 3. The bio nanocomposite products, a) PS;b) PSZ01 c) PSZ02;d) PSZ03;e) PSZ04.[Figure presented] Fig. 6. Bio...

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Scalable Concept Extraction in Industry 4.0

arXiv

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arXiv 2023年

作者： Posada-Moreno, Andrés Felipe Müller, Kai Brillowski, Florian Solowjow, Friedrich Gries, Thomas Trimpe, Sebastian Institute for Data Science in Mechanical Engineering RWTH Aachen University Dennewartstr. 27 Aachen52068 Germany Institut für Textiltechnik of RWTH Aachen University Otto-Blumenthal-Straße 1 Aachen52074 Germany

The industry 4.0 is leveraging digital technologies and machine learning techniques to connect and optimize manufacturing processes. Central to this idea is the ability to transform raw data into human understandable knowledge for reliable data-driven decision-making. Convolutional Neural Networks (CNNs) have been instrumental in processing image data, yet, their "black box" nature complicates the understanding of their prediction process. In this context, recent advances in the field of eXplainable Artificial Intelligence (XAI) have proposed the extraction and localization of concepts, or which visual cues intervene on the prediction process of CNNs. This paper tackles the application of concept extraction (CE) methods to industry 4.0 scenarios. To this end, we modify a recently developed technique, "Extracting Concepts with Local Aggregated Descriptors" (ECLAD), improving its scalability. Specifically, we propose a novel procedure for calculating concept importance, utilizing a wrapper function designed for CNNs. This process is aimed at decreasing the number of times each image needs to be evaluated. Subsequently, we demonstrate the potential of CE methods, by applying them in three industrial use cases. We selected three representative use cases in the context of quality control for material design (tailored textiles), manufacturing (carbon fiber reinforcement), and maintenance (photovoltaic module inspection). In these examples, CE was able to successfully extract and locate concepts directly related to each task. This is, the visual cues related to each concept, coincided with what human experts would use to perform the task themselves, even when the visual cues were entangled between multiple classes. Through empirical results, we show that CE can be applied for understanding CNNs in an industrial context, giving useful insights that can relate to domain knowledge. © 2023, CC BY.

关键词： Industry 4.0

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Enhanced PVA-bioplastic membranes with nanocellulose and hydroxyapatite derived from blood clam shells

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Environmental Nanotechnology, Monitoring and Management 2025年 23卷

作者： Gapsari, Femiana Kartikowati, Christina Wahyu Madurani, Kartika A. Harmayanti, Afifah Sulaiman, Abdul Mudjib Department of Mechanical Engineering Faculty of Engineering Brawijaya University MT Haryono 167 Malang 65145 Indonesia Department of Chemical Engineering Faculty of Engineering Brawijaya University MT Haryono 167 Malang 65145 Indonesia Department of Chemistry Faculty of Science and Data Analytics Institut Teknologi Sepuluh Nopember Arief Rahman Hakim Surabaya 60111 Indonesia

Bioplastic membranes, particularly those based on polyvinyl alcohol (PVA), are increasingly explored for their environmental benefits and diverse applications. However, these bioplastics often suffer from high water absorption and limited mechanical durability, restricting their practical use compared to conventional plastics. This study aims to address these limitations by incorporating nanocellulose from Cordia dichotoma fiber (CDf) and a hydroxyapatite (HA) coating derived from blood clam shells—a novel and sustainable approach. The HA-coated PVA-nanocellulose bioplastic was evaluated for tensile strength, water absorption, and antibacterial activity, using Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). Results showed substantial improvements, with tensile strength increasing from 5.62 to 12.63 MPa and elastic modulus from 6.73 to 15.85 MPa, attributed to enhanced cross-linking from the HA layer. Additionally, antibacterial testing showed weak inhibition zones (<5 mm) against E. coli and S. aureus, indicating mild antimicrobial properties. This research contributes to sustainable bioplastic technologies by leveraging waste-derived materials to improve functionality, making these biocomposites promising for packaging, water purification and biomedical applications, and other fields requiring durable, eco-friendly materials. © 2024 Elsevier B.V.

关键词： Bioplastic Cellulose Hydroxyapatite Membranes

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Corrosion inhibition of weldment by Nephelium lappaceum peel extract in 3.5% NaCl solution

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South African Journal of Chemical engineering 2022年 41卷 223-232页

作者： Gapsari, Femiana Setyarini, Putu H. Kurniawan, Fredy Ahnaf, Ahnaf Anwar, Moch.Syaiful Zuryati, Ulul Khairi Department of Mechanical Engineering Faculty of Engineering Brawijaya University MT Haryono 167 Malang 65145 Indonesia Department of Chemistry Faculty of Science and Data Analytics Institut Teknologi Sepuluh Nopember Arief Rahman Hakim Surabaya 60111 Indonesia Research Center for Metallurgy and Materials National Research and Innovation Agency Komplek Puspiptek Serpong Tangerang Selatan 15314 Indonesia Analytics Chemistry Laboratory Faculty of Mathematics and Natural Sciences Mataram University Majapahit 62 Mataram 83115 Indonesia

Nephelium lappaceum peel Extract (NPE) is effective to control carbon steel weldment corrosion in acidic *** study analyzes NPE performance (0 to 60 ppm) as corrosion inhibitor on weldment in 3.5% NaCl. Potentiodynamic polarization was used to investigate corrosion rate and inhibition performance. The results revealed that NPE has strong effect (83%) on heat affected zone (HAZ) and on base metal (BM) (62%) and on weld metal (WM) (71%). NPE acted as mixed type inhibitor on all weldment areas. On weldment areas, there was physisorption (WM and HAZ) following isothermal Langmuir, but on BM chemisorption might also happen. The results surface analysis, FTIR and UV Vis are in line, indicating that inhibition behavior happened due to the formation of adsorbed layer on the weldment surface. This study revealed that NPE had different performance in each region and solution temperature. © 2022 The Authors

关键词： Chemisorption Corrosion Inhibitor Physisorption

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