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Preparation and characterization of amorphous silica nano (SiO2) based on Lumajang sand using precipitation method for biomaterial composite applications

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AIP Conference Proceedings 2023年第1期2554卷

作者： Siswanto Dyah Hikmawati Djony Izak Rudyardjo Jan Ady Erica Medina Ramadhaningtyas 1Material Laboratory Department of Physics Faculty Science and Technology Universitas Airlangga Kampus C: Mulyorejo Surabaya 60115 East Java Indonesia 2)Biomedical Program Study Faculty Science and Technology Universitas Airlangga Kampus C: Mulyorejo Surabaya 60115 East Java Indonesia

Research has been carried out on the synthesis of amorphous silica (SiO2) made from Lumajang sand using the precipitation method. The use of this method is based on its simplicity and can produce large quantities. To increase the synthesis efficiency, nano sand was used, which was processed using high energy milling (HEM) for 15 hours and sintering temperature variations of 500°C, 600°C, 700°C, 800°C, and 900°C. The results showed that the leaching process using 2M HCl could reduce crystal peaks and ball milling for 15 hours using HEM produces a sand particle size of 103.8 nm. From the XRD test of five sintering temperatures, amorphous silica occurs at a temperature of 700°C, while at other temperatures, crystalline silica peaks still appear. This is supported by the degradation test data, which showed that amorphous silica sintered at 700°C had the highest rate. Thus, this amorphous silica has good potential as a hydroxyapatite biomaterial composite preparation which has a weakness in the rate of degradation

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Room-temperature multiple ligands-tailored SnO_(2) quantum dots endow in situ dual-interface binding for upscaling efficient perovskite photovoltaics with high V_(OC)

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Light(science & Applications) 2021年第12期10卷 2467-2481页

作者： Zhiwei Ren Kuan Liu Hanlin Hu Xuyun Guo Yajun Gao Patrick W.K.Fong Qiong Liang Hua Tang Jiaming Huang Hengkai Zhang Minchao Qin Li Cui Hrisheekesh Thachoth Chandran Dong Shen Ming-Fai Lo Annie Ng Charles Surya Minhua Shao Chun-Sing Lee Xinhui Lu Frédéric Laquai Ye Zhu Gang Li Department of Electronic and Information Engineering Research Institute for Smart Energy(RISE)Guangdong-Hong Kong-Macao(GHM)Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and DevicesThe Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Department of Electrical and Computer Engineering Nazarbayev UniversityNur-SultanKazakhstan The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518057China Hoffmann Institute of Advanced Materials Shenzhen Polytechnic7098 Liuxian BoulevardShenzhen 518055China Department of Applied Physics The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Department of Chemical and Biological Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina King Abdullah University of Science and Technology(KAUST) KAUST Solar Center(KSC)Physical Sciences and Engineering Division(PSE)Material Science and Engineering Program(MSE)Thuwal 23955-6900Kingdom of Saudi Arabia Department of Physics The Chinese University of Hong KongShatin 999077 Hong KongChina Center of Super-Diamond and Advanced Films(COSDAF) Department of ChemistryCity University of Hong KongHong KongChina

The benchmark tin oxide(SnO_(2))electron transporting layers(ETLs)have enabled remarkable progress in planar perovskite solar cell(PSCs).However,the energy loss is still a challenge due to the lack of“hidden interface”*** report a novel ligand-tailored ultrafine SnO_(2) quantum dots(QDs)via a facile rapid room temperature ***,the ligand-tailored SnO_(2) QDs ETL with multi-functional terminal groups in situ refines the buried interfaces with both the perovskite and transparent electrode via enhanced interface binding and perovskite *** novel ETLs induce synergistic effects of physical and chemical interfacial modulation and preferred perovskite crystallization-directing,delivering reduced interface defects,suppressed non-radiative recombination and elongated charge carrier *** conversion efficiency(PCE)of 23.02%(0.04 cm^(2))and 21.6%(0.98 cm^(2),V_(OC) loss:0.336 V)have been achieved for the blade-coated PSCs(1.54 eV E_(g))with our new ETLs,representing a record for SnO_(2) based blade-coated ***,a substantially enhanced PCE(V_(OC))from 20.4%(1.15 V)to 22.8%(1.24 V,90 mV higher V_(OC),0.04 cm^(2) device)in the blade-coated 1.61 eV PSCs system,via replacing the benchmark commercial colloidal SnO_(2) with our new ETLs.

关键词： perovskite interface quantum

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MOF-derived spinel NiMn2O4/CoMn2O4 heterojunction and its application in a high-performance photocatalyst and supercapacitor

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Journal of Environmental Chemical Engineering 2023年第5期11卷

作者： Lee, Kuen-Chan Hsiao, Yu-Sheng Sung, Ming-Yen Chen, Yi-Lun Wu, Nian-Jheng Huang, Jen-Hsien Cho, Er-Chieh Weng, Huei Chu Hsu, Shih-Chieh Department of Science Education National Taipei University of Education No. 134 Section 2 Heping E. Road Da-an District Taipei City106 Taiwan Ph.D. Program in Medical Neuroscience College of Medical Science and Technology Taipei Medical University 250 Wuxing Street Taipei City110 Taiwan Department of Materials Science and Engineering National Taiwan University of Science and Technology No. 43 Section 4 Keelung Road Da-an District Taipei10607 Taiwan Department of Clinical Pharmacy School of Pharmacy College of Pharmacy Taipei Medical University 250 Wuxing Street Taipei City110 Taiwan Université Paris-Saclay CNRS Institut des Sciences Moléculaires d′Orsay Orsay91405 France Department of Green Material Technology Green Technology Research Institute CPC Corporation No. 2 Zuonan Rd. Nanzi District Kaohsiung City81126 Taiwan Department of Mechanical Engineering Chung Yuan Christian University No. 200 Chungpei Rd Chungli District Taoyuan City32023 Taiwan Department of Chemical and Materials Engineering Tamkang University No. 151 Yingzhuan Road Tamsui District New Taipei City25137 Taiwan

Metal oxide heterojunctions have attracted considerable attention in photocatalyst and supercapacitor applications. In this study, NiMn2O4/CoMn2O4 (NMO/CMO) heterojunctions were synthesized using ternary metal-organic frameworks (MOFs) as precursors. After calcination at 500 °C, the as-prepared NMO/CMO composite maintains the porous sheet-like morphology of the ternary MOF, exhibiting a highly porous structure. The heterostructured NMO/CMO composite demonstrates enhanced photocatalytic performance compared with pure NMO and CMO. This enhancement may be attributed to the well-aligned energy levels at the NMO/CMO interface, which effectively reduces charge recombination and facilitates the efficient transport of photogenerated carriers. In addition, the NMO/CMO heterojunction exhibits enhanced supercapacitor performance owing to the increased number of active redox sites and reduced charge transfer resistance. When tested at 3 A/g, the NMO/CMO composite displays a higher capacitance (756.4 F/g) than pure NMO (579.6 F/g) and CMO (519.6 F/g) and remarkable rate capability, maintaining a capacitance of 639 F/g even at 10 A/g. Notably, asymmetric supercapacitors fabricated using NMO/CMO and activated carbon can achieve an energy density of 32.18 W h/kg at 750 W/kg and superior cycling life, retaining 92.1% of its initial capacitance after 3000 cycles. © 2023 Elsevier Ltd

关键词： Heterojunctions

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Construction of dual Z-scheme Ag3VO4–BiVO4/InVO4 photocatalysts using vanadium source from spent catalysts for contaminated water treatment and bacterial inactivation

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Chemosphere 2024年 363卷 142746页

作者： Lee, Kuen-Chan Hsu, Shih-Chieh Huang, Jen-Hsien Wang, Kuan-Syun Pang, Wei Kong Hu, Chih-Wei Jiang, Yi-Jhen Cho, Er-Chieh Weng, Huei Chu Liu, Ting-Yu Department of Science Education National Taipei University of Education No. 134 Sec. 2 Heping E. Road Da-an District Taipei City106 Taiwan PhD Program in Medical Neuroscience College of Medical Science and Technology Taipei Medical University 250 Wuxing Street Taipei City110 Taiwan Department of Chemical and Materials Engineering Tamkang University No. 151 Yingzhuan Road Tamsui District New Taipei City25137 Taiwan Department of Green Material Technology Green Technology Research Institute CPC Corporation No.2 Zuonan Rd. Nanzi District Kaohsiung City81126 Taiwan Department of Materials Engineering Ming Chi University of Technology New Taipei City243303 Taiwan Faculty of Engineering Institute for Superconducting & Electronic Materials University of Wollongong WollongongNSW Australia National Synchrotron Radiation Research Center 101 Hsin-Ann Road Hsinchu Science Park Hsinchu30076 Taiwan School of Pharmacy College of Pharmacy Taipei Medical University 250 Wuxing Street Taipei City110 Taiwan Department of Mechanical Engineering Chung Yuan Christian University No. 200 Chungpei Road Chungli District Taoyuan City32023 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan City32003 Taiwan College of Engineering & Center for Sustainability and Energy Technologies Chang Gung University Taoyuan33302 Taiwan

Vanadate-based photocatalysts have recently attracted substantial attention owing to their outstanding photocatalytic activity for degrading organic pollutants and generating energy via photocatalytic processes. However, the relatively high price of vanadium has hindered the development of vanadate-based photocatalysts for various applications. Spent catalysts obtained from oil refineries typically contain a significant quantity of vanadium, making them valuable for recovery and utilization as precursors for the production of high-value-added photocatalysts. In this study, we transformed the V present in spent catalysts produced by the petrochemical industry into ternary vanadate-based photocatalysts [BiVO4/InVO4/Ag3VO4 (BVO/IVO/AVO, respectively)] designed for water remediation. The ternary composites revealed an enhanced photocatalytic capability, which was 1.42 and 5.1 times higher than those of the binary BVO/IVO and pristine AVO due to the facilitated charge separation. The ternary photocatalysts not only effectively treated wastewater containing various organic dyes, such as methylene blue (MB), rhodamine 6G (R6G), and brilliant green (BG), but also exhibited remarkable photocatalytic performance in the degradation of antibiotics, reduction of Cr(VI), and bacterial inactivation. This paper proposes a feasible route for recycling industrial waste as a source of vanadium to produce highly efficient vanadate-based photocatalysts. © 2024 Elsevier Ltd

关键词： Water pollution

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Harnessing enhanced stability and high-rate capability in lithium-ion batteries using synergistic SnS 2 /MoS 2 2D nanostructures with optimized conversion/alloying reactions

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Journal of Alloys and Compounds 2024年 984卷

作者： Boya Venugopal Ravi Mudike Ranjith Ravi Prasanta Kumar Sahoo Abhishek Tripathi Indrajit Shown Institute of Atomic and Molecular Sciences Academia Sinica Taipei 10617 Taiwan Nanoscience and Technology Program Taiwan International Graduate Program Academia Sinica Taipei 11529 Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu 30013 Taiwan School of Science Minzu University of China Beijing 100081 China Department of Chemistry Hindustan Institute of Technology and Science Chennai 603103 India National Institute of Hydrology Jalvigyan Bhawan Roorkee 247667 India Department of Metallurgical and Material Engineering Malaviya National Institute of Technology Jaipur 302017 India

Recently, there has been a significant interest in the application of SnS 2 /MoS 2 2D nanostructure composites in lithium-ion batteries (LIBs) due to their advantageous conversion, intercalation, and alloying reactions, leading to high capacity during charge and discharge cycles. In this study, we successfully synthesized SnS 2 /MoS 2 composites with a 2D-nanoplate morphology using a single-step hydrothermal method. Specifically, the optimized SnS 2 /MoS 2 -3:1 composite was tested as anodes in coin cell LIBs, demonstrating an impressive capacity of 710 mAh/g at a current density of 500 mA/g, along with outstanding stability (800 cycles) and remarkable rate capability compared to other composites. The excellent electrochemical performance of the SnS 2 /MoS 2 -3:1 composite can be attributed to the moderately coupled SnS 2 and MoS 2 2D-nanosheets, which provide short lithium-ion transportation lengths, low charge transfer resistance, and dominant capacitive behavior.

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Preference of Dogs Towards Feeding Toys Made of Natural Rubber, and Their Potential to Improve Canine Behaviour: A Study Based on Owners' Observations

SSRN

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SSRN 2023年

作者： Boonhoh, Worakan Saramolee, Prachid Sriphavatsarakom, Prarom Amaek, Waluka Waran, Natalie Wongtawan, Tuempong Animal Behaviour Research Group Akkhraratchakumari Veterinary College Walailak University Nakhon Si Thammarat80160 Thailand Center of Excellence in Innovation on Essential Oil and Bioactive Compounds Walailak University Nakhon Si Thammarat80160 Thailand One Health Research Center Walailak University Nakhon Si Thammarat80160 Thailand Material Sciences and Engineering Program School of Engineering and Resources Walailak University Nakhon Si Thammarat80161 Thailand Department of Preclinic and Applied Animal Science Faculty of Veterinary Science Mahidol University Nakhon Pathom73170 Thailand College of Graduate Studies Walailak University Nakhon Si Thammarat80160 Thailand Faculty of Education Humanities and Health Science Eastern Institute of Technology Hawke's Bay 4142 New Zealand

Improper feeding methods can be linked to canine behaviour problems, as the conventional bowl-feeding approach fail to mimic natural behaviour and is associated with obesity. Feeding toys can potentially contribute to the enhancement of dog behaviour by mimicking natural hunting behaviour and promoting increased canine activity. Para rubber is a natural rubber with high flexibility and is tolerant of animal teeth, making it safer for animals compared to plastic and silicone. This study had two main objectives: firstly, to examine dogs' preferences for the scent and colour added to a para rubber product;and secondly, to explore the impact of using para rubber feeding toys on dog behaviours. The feeding toys were produced from natural rubber, with added scents and colours incorporated during their production. Subsequently, these toys were distributed to dog owners for evaluation. Owners completed the Thai version of the C-BARQ questionnaire, which evaluate canine behaviour both prior to and following a month of interaction with the toys. The findings indicated that dogs exhibited a preference for yellow toys over blue ones, as well as a preference for vanilla-scented toys compared to those with a beef scent. Following one month of consistent use of the para rubber toy, dogs tended to reduce various undesirable behaviours. Notably, overexcitement behaviour showed a nearly threefold decrease, and this reduction was statistically significant (p = 0.003). These outcomes emphasise the potential of natural rubber feeding toys in mitigating excitation-related behaviours, while also highlighting dogs' preference towards specific colours and scents. Consequently, there is a suggestion that enhancing toys with appealing scents or colours might foster greater interaction between dogs and their toys, potentially leading to a positive influence on their overall behavioural welfare. © 2023, The Authors. All rights reserved.

关键词： Color

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Chemical evolution of some selected complex organic molecules in low-mass star-forming regions

arXiv

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arXiv 2023年

作者： Bhat, Bratati Kar, Rumela Mondal, Suman Kumar Ghosh, Rana Gorai, Prasanta Shimonishi, Takashi Tanaka, Kei E.I. Furuya, Kenji Das, Ankan Institute of Astronomy Space and Earth Science 1 Bidhan Sishu Sarani Kolkata700054 India Department of Metallurgical Engineering and Material Sciences IIT Bombay Powai Maharashtra Mumbai400076 India S. N. Bose National Center for Basic Sciences JD-Block Salt Lake Kolkata700098 India Indian Centre for Space Physics 43 Chalantika Garia Station Road Kolkata700084 India Department of Space Earth & Environment Chalmers University of Technology GothenburgSE-412 96 Sweden Center for Transdisciplinary Research Niigata University Niigata Nishi-ku950-2181 Japan Environmental Science Program Department of Science Faculty of Science Niigata University Niigata Nishi-ku950-2181 Japan Department of Earth and Planetary Sciences Tokyo Institute of Technology Meguro Tokyo152-8551 Japan Center for Computational Sciences University of Tsukuba Tsukuba305-8577 Japan National Astronomical Observatory of Japan Tokyo181-8588 Japan

The destiny of complex organic molecules (COMs) in star-forming regions is interlinked with various evolutionary phases. Therefore, identifying these species in diversified environments of identical star-forming regions would help to comprehend their physical and chemical heritage. We identified multiple COMs utilizing the Large program ‘Astrochemical Surveys At IRAM’ (ASAI) data, dedicated to chemical surveys in Sun-like star-forming regions with the IRAM 30 m telescope. It was an unbiased survey in the millimeter regime, covering the prestellar core, protostar, outflow region, and protoplanetary disk phase. Here, we have reported some transitions of seven COMs, namely, methanol (CH3OH), acetaldehyde (CH3CHO), methyl formate (CH3OCHO), ethanol (C2H5OH), propynal (HCCCHO), dimethyl ether (CH3OCH3), and methyl cyanide (CH3CN) in some sources L1544, B1-b, IRAS4A, and SVS13A. We found a trend among these species from the derived abundances using the rotational diagram method and MCMC fit. We have found that the abundances of all of the COMs, except for HCCCHO, increase from the L1544 (prestellar core) and peaks at IRAS16293-2422 (class 0 phase). It is noticed that the abundance of these molecules correlate with the luminosity of the sources. The obtained trend is also visible from the previous interferometric observations and considering the beam dilution effect. Copyright © 2023, The Authors. All rights reserved.

关键词： Molecules

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Study on Ag(I) Loaded ZIF-8 and Ag(I) Ion Release in Artificial Seawater

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materials 2023年第5期16卷 2040页

作者： Tsai, Shang-Tien Tang, Wei-Cheng Wei, Yeu-Kuen Wu, Kevin C.-W. Program of Green Materials and Precision Devices National Taiwan University Taipei10617 Taiwan Material and Chemical Research Laboratories Industrial Technology Research Institute Hsinchu30011 Taiwan Department of Chemical Engineering National Taiwan University Taipei10617 Taiwan Institute of Biomedical Engineering & Nanomedicine National Health Research Institutes 35 Keyan Road Miaoli35053 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan32003 Taiwan Yonsei Frontier Lab Yonsei University 50 Yonsei-ro Seoul03722 Korea Republic of

From a porous structure perspective, the one-stage de novo synthesis method and impregnation method were applied to synthesize Ag(I) ion-containing ZIF-8 samples. With the de novo synthesis method, Ag(I) ions could be located inside micropores or adsorbed on the external surface of the ZIF-8 by selecting AgNO3 in water or Ag2CO3 in ammonia solution as precursors, respectively. The ZIF-8 confining Ag(I) ion exhibited a much lower constant releasing rate than the Ag(I) ion adsorbed on the ZIF-8 surface in artificial seawater. As such, strong diffusion resistance in association with the confinement effect is contributed by ZIF-8’s micropore. On the other hand, the release of Ag(I) ions adsorbed on the external surface was diffusion limited. Therefore, the releasing rate would reach a maximum not increasing with Ag(I) loading in the ZIF-8 sample. © 2023 by the authors.

关键词： Ions

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Performance of vehicle direction behavior on turning conditions by adding braking force proportion control

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AIP Conference Proceedings 2024年第1期3053卷

作者： I. Ketut Adi Atmika I. Gusti Agung Kade Suriadi Mechanical Engineering Department of Udayana University Street of Bukit Jimbaran Bali 80361 Indonesia Technology and Material Research Center of Udayana University Street of Bukit Jimbaran Bali 80361 Indonesia Doctoral Program of Engineering Science Engineering Faculty of Udayana University Street of PB Sudirman Bali 80114 Indonesia

The performance of vehicle direction stability both on straight roads and turning roads is one of the important aspects to be considered in designing automotive products as a whole. In straight road conditions, an antilock brake system has been developed or better known as the Antilock Breaking System (ABS), but in turning conditions, the standard ABS performance is less than optimal to overcome oversteer or understeer vehicle conditions. The less optimal performance of vehicle direction stability is due to the magnitude of the braking force of each wheel is still the same while in turning conditions the braking force requirements of each wheel are not the same. One strategy to overcome these weaknesses is to control the proportion of braking force on each wheel. The research was conducted by formulating the physical model of the system into a mathematical model, then simulating it with a Simulink matlab. The braking force proportion control system model, and the vehicle model are made completely, then integrated into the vehicle direction stability performance plant/system. The simulation results show that at a fairly high speed of 80 km/hour the braking system with control of the proportion of braking force is still quite good, while the standard ABS at speeds above 60 km/hour tends to oversteer.

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A Predictive First-Principles Framework of Chiral Charge Density Waves

arXiv

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arXiv 2024年

作者： Shao, Sen Chiu, Wei-Chi Hossain, Md Shafayat Hou, Tao Wang, Naizhou Belopolski, Ilya Zhao, Yilin Ni, Jinyang Zhang, Qi Li, Yongkai Liu, Jinjin Yahyavi, Mohammad Jin, Yuanjun Feng, Qiange Cui, Peiyuan Zhang, Cheng-Long Yao, Yugui Wang, Zhiwei Yin, Jia-Xin Xu, Su-Yang Ma, Qiong Gao, Wei-Bo Bansil, Arun Hasan, M. Zahid Chang, Guoqing Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore637371 Singapore Department of Physics Northeastern University BostonMA02115 United States Quantum Materials and Sensing Institute Northeastern University BurlingtonMA01803 United States Department of Physics Princeton University PrincetonNJ08544 United States Wako Saitama351-0198 Japan School of Physics Beijing Institute of Technology Beijing100081 China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing100081 China Material Science Center Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing314011 China Department of Physics Southern University of Science and Technology Shenzhen Guangdong518055 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China Department of Chemistry and Chemical Biology Harvard University CambridgeMA United States Department of Physics Boston College Chestnut HillMA United States CIFAR Azrieli Global Scholars program CIFAR Toronto Canada

Implementing and tuning chirality is fundamental in physics, chemistry, and material science. Chiral charge density waves (CDWs), where chirality arises from correlated charge orders, are attracting intense interest due to their exotic transport and optical properties. However, a general framework for predicting chiral CDW materials is lacking, primarily because the underlying mechanisms remain elusive. Here, we address this challenge by developing the first comprehensive predictive framework, systematically identifying chiral CDWmaterials via first-principles calculations. The key lies in the previously overlooked phase difference of the CDW Q-vectors between layers, which is linked to opposite collective atomic displacements across different layers. This phase difference induces a spiral arrangement of the Q-vectors, ultimately giving rise to a chiral structure in real space. We validate our framework by applying it to the kagome lattice AV3Sb5 (A = K, Rb, Cs), successfully predicting emergent structural chirality. To demonstrate the generality of our approach, we extend it to predict chiral CDWs in the triangular-lattice NbSe2. Beyond material predictions, our theory uncovers a universal and unprecedented Hall effect in chiral CDW materials, occurring without external magnetic fields or intrinsic magnetization. Our experiments on CsV3Sb5 confirm this prediction, observing a unique signature where the Hall conductivity's sign reverses when the input current is reversed, a phenomenon distinct from known Hall effects. Our findings elucidate the mechanisms behind chiral CDWs and open new avenues for discovering materials with unconventional quantum properties, with potential applications in next-generation electronic and spintronic devices. © 2024, CC BY.

关键词： Optical properties

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