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Tailored morphology of indium-doped titania via sol-gel method for enhanced photocatalysis

Ceramics International 2025年第16期51卷 21590-21599页

作者： Rehman, Junaid ur Zeng, Yilan Javed, Sofia Gohar, Osama Ahmad, Awais Bouyer, Melany Mujahid, Mohammad Motola, Martin H-12 Islamabad44000 Pakistan Texas State University San MarcosTX78666 United States Department of Inorganic Chemistry Faculty of Natural Sciences Comenius University Bratislava Ilkovicova 6 Bratislava842 15 Slovakia Department of Environmental Ecology and Landscape Management Faculty of Natural Sciences Comenius University Bratislava Mlynska Dolina Ilkovicova 6 Bratislava842 15 Slovakia Department of Mechanical and Electrical Systems Engineering of Engineering Kyoto University of Advanced Science Gotanda-cho Yamanouchi Ukyo-ku Kyoto 615-8577 Japan Department of Chemistry The University of Lahore Lahore Pakistan Department of Chemistry and Biochemistry Texas State University San MarcosTX78666 United States Department of Materials Science and Engineering Pak-Austria Fachhochschule: Institute of Applied Sciences and Technology Mang Khyber Pakhtunkhwa Haripur22601 Pakistan Center for Nanotechnology and Advanced Materials Faculty of Mathematics Physics and Informatics Comenius University Bratislava Mlynska Dolina Bratislava842 48 Slovakia

This study investigates the photocatalytic decomposition of methylene blue (MB) using indium-doped titania nanoparticles (TiO2 NPs), synthesized via the sol-gel reflux method, and explores their potential in heterojunction photocatalysis. Titanium tetraisopropoxide was utilized as the precursor, with indium (In) incorporated in varying concentrations (0.25, 0.50, and 0.75 wt%) to enhance photocatalytic activity. Scanning electron microscopy and atomic force microscopy that revealed particle sizes ranging from 12 to 22 nm. X-ray diffraction and Raman spectroscopy confirmed the formation of phase-pure nanocrystalline anatase TiO2. Fourier transform infrared spectroscopy verified the presence of Ti-O-Ti bonding characteristic of the anatase phase. Surface area analysis indicated an increase in surface area with indium doping, rising from 102.9982 m2/g (0.25 wt% In-doped) to 104.5035 m2/g (0.50 wt% In-doped) and reaching 109.8041 m2/g at the highest concentration. Optical properties revealed a corresponding decrease in bandgap energy, which dropped from 3.31 eV (pure TiO2) to 2.97 eV (0.75 wt% In-doped). The results demonstrated that indium doping significantly enhanced the overall photocatalytic degradation of MB, 85 % degradation was achieved after 8 h of UV irradiation at 0.25 wt% In-doped TiO2, making indium-doped titania a promising material for photocatalytic applications. © 2025 The Authors

关键词： Fourier transform infrared spectroscopy

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Rigidity Transition in Chalcogenide Glasses: Dynamic Nano-Indentation and Diffuse Reflectance Spectroscopic Studies

Rigidity Transition in Chalcogenide Glasses: Dynamic Nano-In...

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2022 IEEE International Conference on Emerging Electronics, ICEE 2022

作者： Chaturvedi, Abhishek Varma, G. Sreevidya Sundararajan, Asokan Ramamurty, Upadrasta Indian Institute of Science Department of Materials Engineering Bangalore560012 India Bengaluru560012 India Cmr University Department of Basic Science and Humanities Bagalur Bangalore562149 India Indian Institute of Science Department of Instrumentation and Applied Physics Bangalore560012 India School of Mechanical and Aerospace Engineering College of Engineering Nanyang Technological University Singapore

ISBN: (纸本)9781665491853

Rigidity Transitions in quaternary glasses were investigated using dynamic nanoindentation and DRS reflectance spectroscopy in Ge 15Te 80-xIn 5Ag x glasses. In quasi-static properties such as reduced modulus, E r and hardness, H, an extended rigidity transition with distinct floppy, intermediate and rigid phase is observed, while indentation toughness, K c and brittleness index, BI exhibits a rigidity transition at x =12. Floppy modes exhibit higher K c values when compared to rigid modes. Dynamic visco-elastic property, storage modulus vs frequency, f exhibits a trend reversal for floppy and rigid phases, which is attributed to difference in heat losses. The manifestation of intermediate phase (IP) in optical band gap E g) is observed in the composition range (8 ≤ x ≤ 14) at. %. © 2022 IEEE.

关键词： Glass

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Broadband Spectroscopic Imaging Using Dual Frequency Comb Spectroscopy and Compressive Sensing

Broadband Spectroscopic Imaging Using Dual Frequency Comb Sp...

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CLEO: Applications and Technology, A and T 2022

作者： Strong, Elizabeth F. Coburn, Sean C. Anderson, Alexander Q. Cole, Ryan K. Gopinath, Juliet T. Becker, Stephen Rieker, Gregory B. Department of Mechanical Engineering University of Colorado BoulderCO80309 United States Department of Electrical Computer and Energy Engineering University of Colorado BoulderCO80309 United States Department of Physics University of Colorado BoulderCO80309 United States Department of Applied Mathematics University of Colorado BoulderCO80309 United States

We merge the broadband, high resolution capabilities of dual frequency comb spectroscopy with a spatially resolving single pixel camera experimental architecture to demonstrate broadband spectroscopic imaging via comp... 详细信息

ISBN: (纸本)9781957171050

关键词： Compressed sensing

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Temperature-Dependent Design of BCC High Entropy Alloys: Integrating Deep Learning, CALPHAD, and Experimental Validation

arXiv

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arXiv 2024年

作者： Shargh, Ali K. Stiles, Christopher D. El-Awady, Jaafar A. Department of Mechanical Engineering Johns Hopkins University BaltimoreMD21218 United States Research and Exploratory Development Department Johns Hopkins University Applied Physics Laboratory LaurelMD20723 United States

Due to their compositional complexity, refractory multi-principal element alloys (RMPEAs) exhibit a diverse range of material properties, making them highly suitable for several applications. Importantly, single-phase BCC RMPEAs are known for their superior strength. Nevertheless, identifying the stability of single-phase BCC is challenging because of the vast compositional space of RMPEAs. In this study, we develop a deep learning framework that predicts the fraction of RMPEA phases with high accuracy at several temperatures. Using the accurate predictive framework, we navigate the compositional space of Ti, Fe, Al, V, Ni, Nb and Zr elements to search for potentially stable single-phase BCC RMPEAs and provide design insights that can guide the synthesis of new RMPEAs in experiments. Furthermore, we develop a mathematical equation that enables the rapid and accurate identification of single-phase BCC RMPEAs with high accuracy. The machine learning (ML) model is finally evaluated against a high-fidelity experimental data from literature, confirming that our model accurately predicts the constituent phases of the experimental samples while provides insights that are laborious to extract from experiments. © 2024, CC BY.

关键词： High-entropy alloys

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Violating Kirchhoff's Law of Thermal Radiation in Semitransparent Structures

Violating Kirchhoff's Law of Thermal Radiation in Semitransp...

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CLEO: QELS_Fundamental Science, QELS 2022

作者： Park, Yubin Asadchy, Viktar S. Zhao, Bo Guo, Cheng Wang, Jiahui Fan, Shanhui Department of Electrical Engineering Stanford University StanfordCA94305 United States Ginzton Laboratory Stanford University StanfordCA94305 United States Department of Mechanical Engineering University of Houston Cullen College of Engineering HoustonTX77204 United States Department of Applied Physics Stanford University StanfordCA94305 United States

We design a nonreciprocal thermal emitter that features absorptivity-emissivity contrast in semitransparent setting, by using magneto-optical effect. Our emitter can overcome the restriction that Kirchhoff's law o... 详细信息

ISBN: (纸本)9781557528209

关键词： Energy harvesting

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Hydrolysis Mechanism Analysis of (Ca, Sr)AlSiN:Eu² Red Phosphor Aged Under Pressure Cooker Test and 85°C&85%RH Test: Kinetics Modeling and First-principles Calculation 24

Hydrolysis Mechanism Analysis of (Ca, Sr)AlSiN:Eu² Red Phos...

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24th International Conference on Thermal, mechanical and Multi-physics Simulation and Experiments in Microelectronics and Microsystems, EuroSimE 2023

作者： Wen, Minzhen Guo, Baotong Chen, Shanghuan Hu, Xiao Fan, Xuejun Zhang, Guoqi Fan, Jiajie Institute of Future Lighting Academy for Engineering and Technology Fudan University Shanghai200433 China State Key Laboratory of Applied Optics Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun130033 China Hohai University College of Mechanical and Electrical Engineering Changzhou213022 China Lamar University Department of Mechanical Engineering PO Box 10028 BeaumontTX77710 United States Delft University of Technology Department of Microelectronics CD Delft2628 Netherlands Fudan Zhangjiang Institute Shanghai201203 China

ISBN: (纸本)9798350345971

The (Ca, Sr) AlSiN:Eu²(CSASN:Eu) red phosphor is widely used to improve color rendering of high-power phosphor-converted lighting diode (pc-WLED), but it is always unstable under high temperature and high humidity environments. Therefore, the studies on the temperature and humidity resistance of red phosphors and their aging mechanism have become essential to evaluate its reliability in harsh applications. In this paper, the pressure cooker test (PCT) and 85°C&85% RH aging test were carried out for the CSASN:Eu red phosphors. And, its hydrolysis reaction-driven degradation mechanism was simulated and analyzed based on first-principle calculation, in which the optimized adsorption of simplified CaAlSiN3(CASN) and H2 O was simulated based on Density Function Theory (DFT) and the specific aging process was analyzed by the charge density difference and ab initio molecular dynamics (AIMD). The experimental results showed that the photoluminescence performance of CSASN:Eu red phosphor dropped gradually and finally disappeared under PCT aging, and its temperature-dependent degradation kinetics followed the Arrhenius model well. Meanwhile, the simulation results indicate that the CASN, reacted with H2 O when the H atoms had a tendency to approach N atoms. Both the temperature and humidity could accelerate the hydrolysis reaction rate. © 2023 IEEE.

关键词： Silicon compounds

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Evolution of the Sn-Bi Solder Microstructure vs. Temperature – an In- situ Scanning Electron Microscopy Study

Evolution of the Sn-Bi Solder Microstructure vs. Temperature...

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International Conference on Electronics Packaging (ICEP)

作者： Xin F. Tan Jiye Zhou Stuart D. McDonald Masahiko Ikeda Kazuhiro Nogita School of Mechanical and Mining Engineering The University of Queensland Australia Department of Applied Quantum Physics and Nuclear Engineering Kyushu University Japan Nihon Superior Co. Ltd Japan

Sn-Bi alloys are promising candidates as low temperature solders due to their low eutectic temperature of 139°C, non-toxicity, and low costs. However, the low eutectic temperature also implies these alloys are at high homologous temperatures during service and operation, and solid-state diffusion are faster. This, coupled with the large difference in the solubility of Bi in Sn vs. temperature, can result in substantial microstructural changes in the alloys during thermal cycling or multiple reflow processing. This study uses in-situ scanning electron microscopy to observe the microstructural changes of the TempSave B37 commercial solder as it is heated and cooled between room temperature and 150°C. The mechanisms of the dissolution and reprecipitation of Bi during heating and cooling are revealed. The understanding gained can contribute to better reflow process design to obtain favourable microstructures.

关键词： Heating systems Process design Temperature distribution Scanning electron microscopy Costs Microscopy Metals

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NOMAD: nonlinear manifold decoders for operator learning 22

NOMAD: nonlinear manifold decoders for operator learning

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Proceedings of the 36th International Conference on Neural Information Processing Systems

作者： Jacob H. Seidman Georgios Kissas Paris Perdikaris George J. Pappas Graduate Program in Applied Mathematics and Computational Science University of Pennsylvania Department of Mechanical Engineering and Applied Mechanics University of Pennsylvania Department of Electrical and Systems Engineering University of Pennsylvania

ISBN: (纸本)9781713871088

Supervised learning in function spaces is an emerging area of machine learning research with applications to the prediction of complex physical systems such as fluid flows, solid mechanics, and climate modeling. By directly learning maps (operators) between infinite dimensional function spaces, these models are able to learn discretization invariant representations of target functions. A common approach is to represent such target functions as linear combinations of basis elements learned from data. However, there are simple scenarios where, even though the target functions form a low dimensional submanifold, a very large number of basis elements is needed for an accurate linear representation. Here we present NOMAD, a novel operator learning framework with a nonlinear decoder map capable of learning finite dimensional representations of nonlinear submanifolds in function spaces. We show this method is able to accurately learn low dimensional representations of solution manifolds to partial differential equations while outperforming linear models of larger size. Additionally, we compare to state-of-the-art operator learning methods on a complex fluid dynamics benchmark and achieve competitive performance with a significantly smaller model size and training cost.

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Isolation and identification of natural green and yellow pigments from pineapple pulp and peel

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Materials Today: Proceedings 2022年 63卷 S406-S410页

作者： Hamidin, Nurul Ain Shahanaz Abdullah, Shakila Nor, Farhah Husna Mohd Hadibarata, Tony Department of Technology and Natural Resources Faculty of Applied Sciences and Technology Universiti Tun Hussein Onn Malaysia Pagoh Education Hub 84600 Pagoh Muar Johor Malaysia Department of Physics and Chemistry Faculty of Applied Sciences & Technology Universiti Tun Hussein Onn Malaysia Pagoh Education Hub 84600 Pagoh Muar Johor Malaysia Environmental Engineering Program Curtin University Malaysia CDT250 Miri 98009 Malaysia

The isolation of pineapple pulp and peels can produce natural pigments which contain bioactive compounds that have an antimicrobial effect and benefit human health. Therefore, the aim of this study is to isolate the green and yellow pigments from the pineapple pulp and peels. The isolated pigments were used for phytochemical analysis and antimicrobial activity. These pigments were identified by Fourier transform infrared (FTIR) spectroscopy and Ultraviolet–Visible (UV–Vis). These pigments present phytochemicals have the potential to act as antimicrobial agents. This study would be one of the alternatives in developing food colouring that is beneficial in preserving the quality of food against foodborne pathogens using both isolated pigments. © 2022

关键词： Fourier transform infrared spectroscopy

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Study of SiGeSn-based Multiple Quantum Well Laser for Photonics Integrated Circuits 18

Study of SiGeSn-based Multiple Quantum Well Laser for Photon...

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Silicon Photonics XVIII 2023

作者： Olorunsola, Oluwatobi Said, Abdulla Ojo, Solomon Stanchu, Hryhorii Abernathy, Grey Amoah, Sylvester Saha, Samir Wangila, Emmanuel Grant, Joshua Acharya, Sudip Jheng, Yue-Tong Chang, Guo-En Li, Baohua Salamo, Gregory Yu, Shui-Qing Du, Wei Department of Electrical Engineering University of Arkansas FayettevilleAR72701 United States Material Science and Engineering Program University of Arkansas FayettevilleAR72701 United States Institute for Nanoscience and Engineering University of Arkansas FayettevilleAR72701 United States Department of Physics University of Arkansas FayettevilleAR72701 United States Department of Mechanical Engineering National Chun Cheng University Chiayi County62101 Taiwan Arktonics LLC 1339 South Pinnacle Drive FayettevilleAR72701 United States

ISBN: (纸本)9781510659575

As one of two mainstream platforms, photonics integrated circuits (PICs) on Si photonics platform benefits from the mature complementary metal-oxide-semiconductor (CMOS) manufacturing capabilities and allows for the processing of Si-based PICs with ultra-high volume and low cost. Recent studies of SiGeSn materials, which yield true direct bandgap with sufficient Sn incorporation, hold great promise for PICs featuring scalable, cost-effective, and power-efficient. While the exciting developments in bulk devices including lasers, light emitting diodes (LEDs), and photodetector were reported, the quantum wells (QWs) structure and devices have been investigated targeting the dramatically improved and/or novel device performance via variety of quantum confinement effects. In this work, we report the recent progress on SiGeSn QW development. Particularly, the study of MQW laser is presented. Devices with higher optical confinement factors exhibit clear lasing confirmed by the threshold characteristic and the emission spectra below and above threshold. Only spontaneous emission was observed with the thinner cap layer samples. On the other hand, samples with thicker cap layers of 250 and 290 nm exhibit clear lasing at 77 K with thresholds of 214 and 664 kW/cm2, respectively. These promising results establish the guidance for the device design and pave the way for the SiGeSn QW devices towards future high-performance PICs on Si platform. © 2023 SPIE.

关键词： Timing circuits

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