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International Conference on Knowledge and Smart Technology (KST)

作者： Satetha Siyang Teerakiat Kerdcharoen Materials Science and Engineering Program Faculty of Science Mahidol University Bangkok 10400 Thailand Department of Physics Faculty of Science and Research Network of NANOTEC Mahidol University National Nanotechnology Center Bangkok 10400 Thailand

Thailand has a growing demand in coffee consumption every year. Currently, the nation’s capacity for producing coffee is limited, necessitating a significant amount of imports from overseas. The Arabica coffee in the north of Thailand, where the scent and taste of coffee have a distinct identity based on varied cultivation locations, has reasonably good quality. Because of the impact of the environment, it is still challenging to maintain the quality of coffee beans from season to season. Moreover, fierce competition with nearby nations like Laos and Vietnam leads to lower prices of coffee beans. This forces Thai farmers and entrepreneurs to embrace more advanced technologies in order to comprehend the environment of each plantation region and boost their level of competition. This project aims to develop a trustworthy and cost-effective IoT field monitoring solution to assist farmers in understanding the climate conditions in various plantation areas. In order to examine the relationship between the environments, the data collected by the devices can be transferred back to the public cloud server. Then, it can be used as knowledge to raise Thai coffee beans’ quality to a premium level so they can continue to compete with coffee beans from other countries.

关键词： Cloud computing Agriculture Servers Monitoring Farming Meteorology

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Photoresponse of Thermally Evaporated Copper Oxide-Based Solar Cells 1

Photoresponse of Thermally Evaporated Copper Oxide-Based Sol...

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1st Middle East and North Africa Solar Conference, MENA-SC 2023

作者： Alami, Abdul Hai Ayoub, Mohamad Alashkar, Adnan Alasad, Shamma Mdallal, Ayman Khuri, Siren Aljaghoub, Haya University of Sharjah Sustainable Energy & Power Systems Research Centre Sustainable and Renewable Energy Engineering Department Sharjah United Arab Emirates American University of Sharjah Materials Science and Engineering PhD Program Sharjah United Arab Emirates American University of Sharjah Mechancial Engineering Department Sharjah United Arab Emirates University of Sharjah Sustainable Energy & Power Systems Research Centre Sharjah United Arab Emirates University of Sharjah Industrial Engineering and Engineering Management Department Sharjah United Arab Emirates

ISBN: (纸本)9781665491464

This study reports on the fabrication and characterization of a copper oxide (CuO)-based photoactive cell. Copper was thermally evaporated onto two substrates and post-treated using chemical and thermal treatments to obtain different semiconducting types of CuO. Absorption measurements were conducted to obtain the bandgaps of CuO, which were found to be 1.51 eV and 1.21 eV, for the chemically and thermally treated CuO, respectively. Finally, a chronoamperometry test was conducted to confirm the photoresponse of the cell, which showed a doubling of output current values under light conditions compared to dark conditions. © 2023 IEEE.

关键词： Copper oxides

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Selective Co ALD for Chiplet-to-Wafer and Wafer-to-Wafer Bonding

Selective Co ALD for Chiplet-to-Wafer and Wafer-to-Wafer Bon...

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IEEE International Conference on Interconnect Technology

作者： Cheng-Hsuan Kuo Madison Manley Dipayan Pal Rohan Sahay Ravindra Kanjolia Jacob Woodruff Muhannad Bakir Andrew C. Kummel Mansour Moinpour Jeff Spiegelman Materials Science and Engineering Program University of California San Diego USA Georgia Institute of Technology Georgia USA Department of Chemistry and Biochemistry University of California San Diego EMD Electronics Rasirc

ISBN: (数字)9798350385175

ISBN: (纸本)9798350385182

cyclic clean treatment by using strong oxidant: HOOH and reductant: N2H4 was developed for Cu cleaning which can be applied in the inverse hybrid metal bonding process. Compared to UHV anneal at higher temperature (415C), cyclic clean process is only performed at 340C with lower surface impurities. Also, highly selective Co ALD is deposited on metal Cu but not on SiO2 even after 1000 ALD cycles.

关键词： Wafer bonding Surface cleaning Silicon compounds Annealing Impurities Metals Bonding

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HIGH-PERFORMANCE THERMOPLASTIC-BASED MAGNETIC COMPOSITES

HIGH-PERFORMANCE THERMOPLASTIC-BASED MAGNETIC COMPOSITES

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SAMPE 2023 Conference and Exhibition

作者： Arigbabowo, Oluwasola K. Tate, Jitendra Geerts, Wilhelmus J. Texas State University Materials Science Engineering and Commercialization Program 601 University Drive San MarcosTX78666 United States Ingram School of Engineering Texas State University 601 University Drive San MarcosTX78666 United States Department of Physics Texas State University 601 University Drive San MarcosTX78666 United States

ISBN: (纸本)9781934551431

Magnetic polymer-based composites combine the cost-effectiveness, low density, and manufacturing flexibility of conventional polymers with the unique characteristics of magnetic powders/fillers to form multifunctional magneto polymeric composites that offer superior properties to conventional materials. At higher temperatures, magnetic properties change significantly and the particles within the magnetic powders experience sporadic motion due to the heat which causes misalignment of the magnetic domains, leading to a decrease in magnetism. Due to these adverse temperature effects, high-performance polymers such as polyetheretherketone (PEEK), polyetherimide (PEI) or other high-temperature thermoplastics have been considered suitable matrix for the magnetic fillers, thereby creating a much wider usage for magneto polymeric composite in applications that requires higher temperature (typically above 175 oC). Thus, this review discusses the fabrication processes-injection molding, fused filament fabrication;magnetic performance, and applications of high-performance thermoplastic-based magnetic composites that can be viable for stringent engineering devices such as sensors, actuators, motors, and generators. © 2023 Soc. for the Advancement of Material and Process engineering. All rights reserved.

关键词： Fabrication

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Flow Matching for Accelerated Simulation of Atomic Transport in materials

arXiv

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arXiv 2024年

作者： Nam, Juno Liu, Sulin Winter, Gavin Jun, KyuJung Yang, Soojung Gómez-Bombarelli, Rafael Department of Materials Science and Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Computational and Systems Biology Program Massachusetts Institute of Technology CambridgeMA02139 United States

We introduce LiFlow, a generative framework to accelerate molecular dynamics (MD) simulations for crystalline materials that formulates the task as conditional generation of atomic displacements. The model uses flow matching, with a Propagator submodel to generate atomic displacements and a Corrector to locally correct unphysical geometries, and incorporates an adaptive prior based on the Maxwell–Boltzmann distribution to account for chemical and thermal conditions. We benchmark LiFlow on a dataset comprising 25-ps trajectories of lithium diffusion across 4,186 solid-state electrolyte (SSE) candidates at four temperatures. The model obtains a consistent Spearman rank correlation of 0.7–0.8 for lithium mean squared displacement (MSD) predictions on unseen compositions. Furthermore, LiFlow generalizes from short training trajectories to larger supercells and longer simulations while maintaining high accuracy. With speed-ups of up to 600,000× compared to first-principles methods, LiFlow enables scalable simulations at significantly larger length and time scales. Copyright © 2024, The Authors. All rights reserved.

关键词： Molecular dynamics

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Centrifugal Spinning of Porous Polylactic Acid Fibers by Centrifugal Spinning with Phase Separation for Oil Removal Application

SSRN

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SSRN 2024年

作者： Negoro, Masaki Doan, Hoan Ngoc Vo, Phu Phong Khuat, Khanh Van Thi Kinashi, Kenji Sakai, Wataru Tsutsumi, Naoto Master’s Program of Innovative Materials Kyoto Institute of Technology Matsugasaki Sakyo Kyoto606-8585 Japan Tissue Engineering and Regenerative Medicine Laboratory School of Biomedical Engineering International University Vietnam National University Ho Chi Minh City Viet Nam Faculty of Chemistry University of Science Ho Chi Minh City Viet Nam Doctor’s Program of Materials Chemistry Graduate School of Science and Technology Kyoto Institute of Technology Matsugasaki Sakyo Kyoto606-8585 Japan Faculty of Materials Science and Engineering Kyoto Institute of Technology Matsugasaki Sakyo Kyoto606-8585 Japan

Developing biodegradable oil absorption fibrous materials is essential because discarding conventional separation materials could cause secondary pollution due to their nondegradable properties. In this study, highly hydrophobic and superoleophilic porous polylactic acid (PLA) fibers were prepared using centrifugal spinning combined with nonsolvent-induced phase separation. The porous structure of PLA fibers was controlled by the ratio between good solvent and nonsolvent in the spinning solutions. The morphology and physical properties of the obtained PLA fibers were investigated using various measurement techniques. The PLA fibrous membrane prepared from a PLA solution containing chloroform/dimethylformamide (80/20 w/w) indicated not only a high water contact angle but also a high oil sorption value. The porous PLA fibers are a potential candidate for use as green materials for environmental applications. © 2024, The Authors. All rights reserved.

关键词： Spinning (fibers)

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Conformity Experiment on Inelastic Scattering Exponent of Electrons in Two Dimensions

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Physical Review Letters 2024年第9期133卷 096302页

作者： Ching-Chen Yeh Pin-Chi Liao Yanfei Yang Wei-Chen Lin Alireza R. Panna Albert F. Rigosi Randolph E. Elmquist Chi-Te Liang Gaithersburg Maryland 20899 USA Department of Physics Graphene Waves Germantown Maryland 20876 USA Taiwan International Graduate Program Department of Engineering and System Science Center for Quantum Science and Engineering (CQSE) Taiwan Consortium of Emergent Crystalline Materials (TCECM) Taipei 106 Taiwan

The quantum Hall (QH) effect is one of the most widely studied physical phenomenon in two dimensions. The plateau-plateau transition within this effect can be comprehensively described by the scaling theory, which encompasses three pivotal exponents: the critical exponent κ, the inelastic scattering exponent p, and the universal exponent γ. Prior studies have focused on measuring κ and estimating γ, assuming a constant p value of 2 across magnetic fields. Here, our work marks a significant advancement by measuring all three exponents within a single graphene device and a conventional two-dimensional electron system. This study uniquely determines p at low magnetic fields (weak localization region and well outside the QH regime) and high magnetic fields (in the vicinity of the QH regime). Employing a comprehensive analytical approach that includes weak localization, plateau-plateau transitions, and variable range hopping, we have directly determined κ, p, and γ. Our findings reveal a distinct variation in p, shifting from 1 in the low magnetic field regime to 2 in the QH regime in graphene.

关键词： Electrical properties Fermions Landau levels Quantum interference effects Quantum phase transitions

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Optical Patterning of Two-Dimensional materials

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Research 2020年第1期2020卷 1064-1078页

作者： Pavana Siddhartha Kollipara Jingang Li Yuebing Zheng Walker Department of Mechanical Engineering The University of Texas at AustinAustinTX 78712USA Materials Science&Engineering Program and Texas Materials Institute The University of Texas at AustinAustinTX 78712USA

Recent advances in the field of two-dimensional(2D)materials have led to new electronic and photonic devices enabled by their unique properties at atomic *** 2D materials into desired patterns on substrates is often an essential and foremost step for the optimum performance of the functional *** this regard,optical patterning of 2D materials has received enormous interest due to its advantages of high-throughput,site-specific,and on-demand *** years have witnessed scientific reports of a variety of optical techniques applicable to patterning 2D *** this minireview,we present the state-of-the-art optical patterning of 2D materials,including laser thinning,doping,phase transition,oxidation,and *** applications based on optically patterned 2D materials will be discussed as *** further developments,optical patterning is expected to hold the key in pushing the frontiers of manufacturing and applications of 2D materials.

关键词： frontier doping optimum

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A Spin-Orbit Torque Switch at Ferromagnet/Antiferromagnet Interface Toward Stochastic or Memristive Applications via Tailoring Antiferromagnetic Ordering

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Advanced Electronic materials 2023年第12期9卷

作者： Wang, Ssu-Yuan Chen, Sheng-Huai Chang, Hao-Kai Li, Yi-Ting Tseng, Chih-Hsiang Chen, Po-Chuan Yang, Chao-Yao Lai, Chih-Huang Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu300093 Taiwan Department of Materials Science and Engineering National Tsing Hua University Hsinchu300044 Taiwan Undergraduate Degree Program of Systems Engineering and Technology National Yang Ming Chiao Tung University Hsinchu300093 Taiwan

Antiferromagnet (AFM) has currently participated in the spin-orbit torque (SOT) technology due to its great potential to be applied to the field-free SOT switching and to promote the thermal stability of MRAM. However, the effect of varying AFM ordering on the SOT switching and the associated properties is still not comprehensively understood. This work reports how an AFM ordering modifies the strength of Dzyaloshinskii–Moriya-interaction (DMI) in a heavy metal (Pt)/FM (Co)/AFM (IrMn) trilayer and its effects on SOT switching. Increasing the AFM ordering reflects the enhanced exchange bias through increasing IrMn thickness appears to significantly reduce the DMI strength of the trilayer. Controlling the IrMn thickness appears to serve as a unique switch to activate memristivity/stochasticity in the devices via tailoring AFM ordering on exchange bias: The strong AFM ordering via increasing IrMn thickness enables to increase the stability of multi-levels for SOT switching, which promotes the memristivity for neuromorphic application. On the contrary, the weak AFM ordering via reducing IrMn thickness will lead to significant stochasticity for the physically unclonable functionality. This work demonstrates an intrinsic tuning over the AFM ordering will serve as a switch to turn the SOT device into a stochastic/memristive cell to bridge probabilistic and neuromorphic computing. © 2023 The Authors. Advanced Electronic materials published by Wiley-VCH GmbH.

关键词： Stochastic systems

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Development of Flame Retardant Stearic Acid Doped Graphite Powder and Magnesium Hydroxide Nanoparticles, Material for Thermal Energy Storage Applications 21

Development of Flame Retardant Stearic Acid Doped Graphite P...

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21st International Union of materials Research Societies International Conference in Asia, IUMRS-ICA 2021

作者： Han, Kyaw Thet Lhosupasirirat, Siraprapa Srikhirin, Pongsid Houngkamhang, Nongluck Srikhirin, Toemsak Materials Science and Engineering Program School of Materials Science and Innovation Faculty of Science Mahidol University Bangkok10400 Thailand Ramkhamhaeng University Bangkok Thailand College of Nanotechnology King Mongkut's Institute of Technology Ladkrabang Bangkok10520 Thailand Research Network of NANOTEC Mahidol University National Nanotechnology Center Thailand Department of Physics Faculty of Science Mahidol University 272 Rama VI Road Ratchathewi District Bangkok10400 Thailand

Nano-enhanced organic phase change material (PCM) composite consists of stearic acid (SA, act as the thermal storage media), graphite powder(GP, function as thermal conductor), and magnesium hydroxide nanoparticles(nMH), micro-sized (MMH), function as the flame retarder), were formulated and investigated for their thermophysical properties and flammability. The flame-retardant properties of nano-enhanced composite PCM were evaluated by using the burning test. Phase change temperature, phase change latent heat, and thermal conductivity were obtained by the T-history method. To reduce the flammability, 5wt% of MH with 0.8µm and 200nm were added to PCMs. 1wt% of GP improved thermal conductivity of stearic acid from 0.245 to 0.4887 W/mk, and doping of flame-retardant nanoparticles to PCM showed the reduction of flammability and slightly effecting on latent heat of PCM. nMH were found to work better for stearic acid flammability than MMH, where combustion time of 0.1g pure stearic acid(SA) was decreased from 41s to 17s and 23s. For nano-sized(SA/nMH) and micron-sized(SA/MMH)composites, the latent heat of pure PCM dropped from 171.26 to 124.85KJ/kg, but micron-sized addition negatively affects latent heat values by reducing from 171.26 to 88.87 KJ/kg. The results confirmed that nMH/GP/SA composite could reduce flammability without showing a negative impact on storage capacity. © Published under licence by IOP Publishing Ltd.

关键词： Phase change materials

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