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Tailoring Light–Matter Interactions in Overcoupled Resonator for Biomolecule Recognition and Detection

Nano-Micro Letters 2025年第1期17卷 262-280页

作者： Dongxiao Li Hong Zhou Zhihao Ren Cheng Xu Chengkuo Lee Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore Center for Intelligent Sensors and MEMS(CISM) National University of SingaporeSingapore 117608Singapore

Plasmonic nanoantennas provide unique opportunities for precise control of light–matter coupling in surface-enhanced infrared absorption(SEIRA)spectroscopy,but most of the resonant systems realized so far suffer from the obstacles of low sensitivity,narrow bandwidth,and asymmetric Fano resonance ***,we demonstrated an overcoupled resonator with a high plasmon-molecule coupling coefficient(μ)(OC-Hμresonator)by precisely controlling the radiation loss channel,the resonator-oscillator coupling channel,and the frequency detuning *** observed a strong dependence of the sensing performance on the coupling state,and demonstrated that OC-Hμresonator has excellent sensing properties of ultra-sensitive(7.25%nm^(−1)),ultra-broadband(3–10μm),and immune asymmetric Fano *** characteristics represent a breakthrough in SEIRA technology and lay the foundation for specific recognition of biomolecules,trace detection,and protein secondary structure analysis using a single array(array size is 100×100μm^(2)).In addition,with the assistance of machine learning,mixture classification,concentration prediction and spectral reconstruction were achieved with the highest accuracy of 100%.Finally,we demonstrated the potential of OC-Hμresonator for SARS-CoV-2 *** findings will promote the wider application of SEIRA technology,while providing new ideas for other enhanced spectroscopy technologies,quantum photonics and studying light–matter interactions.

关键词： Plasmonic nanoantennas Light-matter interaction Surface-enhanced infrared absorption Overcoupled Biosensing

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Microalgal bioremediation of food-processing industrial wastewater under mixotrophic conditions： Kinetics and scaleup approach

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Frontiers of Chemical Science and Engineering 2016年第4期10卷 499-508页

作者： Suvidha Gupta R. A. Pandey Sanjay B. Pawar Environmental Biotechnology Division CSIR-Nafional Environmental Engineering Research Institute (NEERI) Nagpur 440020 India

The Chlorella microalgae were mixotrophically cultivated in an unsterilized and unfikered raw foodprocessing industrial wastewater. Both inorganic carbon （CO2-air） and organic carbon （wastewater） were provided simultaneously for microalgae growth. The aim of the study is to find out the utilization rates of total organic carbon （TOC） and chemical oxygen demand （COD） under mixotrophic conditions for a given waste water. About 90% reduction in TOC and COD were obtained for all dilutions of wastewater. Over 60% of nitrate and 40% of phosphate were consumed by microalgae from concentrated raw wastewater. This study shows that microalgae can use both organic and inorganic sources of carbon in more or less quantity under mixotrophic conditions. The growth of microalgae in food-processing industrial wastewater with all studied dilution factors, viz. zero （raw）, 1.6 （dilution A）, and 5 （dilution B） suggests that the freshwater requirement could be reduced substantially （20%-60%）. The degradation kinetics also suggests that the microalgae cultivation on a high COD wastewater is feasible and scalable.

关键词： total organic carbon wastewater bioremedia-tion kinetics mixotrophic cultivation

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Two-electron quantum ring in short pulses

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Chinese Physics B 2015年第2期24卷 46-52页

作者： Poonam Silotia Rakesh Kumar Meena Vinod Prasad Department of Physics and Astrophysics University of Delhi Department of Physics Swami Shraddhanand CollegeUniversity of Delhi

The response of a two-electron quantum ring system to the short laser pulses of different shapes in the presence of external static electric field is *** variation of transition probabilities of the two-electron quantum ring from ground state to excited states with a number of parameters is shown and *** energy levels and wavefunctions of the system in the presence of static electric field are found by solving the time-independent Schrodinger equation numerically by the finite difference *** shape of the pulse plays a dominant role on the dynamics.

关键词： quantum ring ultrashort pulses transition probability

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Cloning of a novel phytase from an anaerobic rumen bacterium, Mitsuokella jalaludinii, and its expression in Escherichia coli

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Journal of Integrative Agriculture 2015年第9期14卷 1816-1826页

作者： TAN Wan-qin Phang Chiun Yee Sieo Chin Chin Yiap Beow Chin Clemente Michael Wong Vui Ling Norhani Abdullah Son Radu Ho Yin Wan Laboratory of Vaccines and Immunotherapeutics Institute of BioscienceUniversiti Putra Malaysia Department of Microbiology Faculty of Biotechnology and Biomolecular SciencesUniversiti Putra Malaysia Department of Life Sciences School of Pharmacy and HealthFaculty of Medicine and HealthInternational Medical University Biotechnology research Institute Universiti Malaysia Sabah Institute of Tropical Agriculture Universiti Putra Malaysia Department of Biochemistry Faculty of Biotechnology and Biomolecular SciencesUniversiti Putra Malaysia Department of Food Science Faculty of Food Science and TechnologyUniversiti Putra Malaysia

The ful length phytase gene of Mitsuokel a jalaludini was successful y cloned and was found to be 1 047 bp in length, with 348 amino acids, and was designated as PHY7 phytase gene. A comparison of the sequence of PHY7 phytase gene of M. jalaludini with various microbial phytase gene sequences showed that it was not similar to those from other bacteria except Selenomonas ruminatium, thus suggesting that they may both express a new class of phytase. The PHY7 phytase gene was subsequently subcloned into bacterial expression vector, pET32a, for expression in Escherichia coli strain Ro-setta-gami. Expression of the recombinant phytase gene was optimised and characterised. The recombinant phytase was estimated to be approximately 55 kDa by SDS-PAGE analysis. The recombinant phytase exhibited optimum activity at 55°C, pH 4.5 and showed good pH stability from pH 3.5 to 5.5 (>78%relative activity). Metal ions such as Ca2+, Mg2+, and K+were found to exert signiifcant stimulatory effect on the recombinant phytase activity while Cu2+, Fe3+, and Zn2+greatly inhibited the enzyme activity. The recombinant phytase showed moderate resistance to trypsin proteolysis, but susceptible to pepsin proteolysis. The results of the study showed that several characteristics of recombinant phytase were slightly different from the native enzyme. Unfavourable characteristics such as reduced pH stability and metal ion effects should be taken into consideration during feed enzyme formulation.

关键词： phytase cloning recombinant Escherichia coli Mitsuokella jalaludinii

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Self-assembly of nitrogen-doped TiO_(2) with exposed {001} facets on a graphene scaffold as photo-active hybrid nanostructures for reduction of carbon dioxide to methane

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Nano research 2014年第10期7卷 1528-1547页

作者： Wee-Jun Ong Lling-Lling Tan Siang-Piao Chai Siek-Ting Yong Abdul Rahman Mohamed Low Carbon Economy(LCE)Group Chemical Engineering DisciplineSchool of EngineeringMonash UniversityJalan Lagoon Selatan46150 Bandar SunwaySelangorMalaysia Low Carbon Economy(LCE)Group School of Chemical EngineeringUniversiti Sains MalaysiaEngineering CampusSeri Ampangan14300 Nibong TebalPulau PinangMalaysia

Tailored synthesis of well-defined anatase TiO_(2)-based crystals with exposed{001}facets has stimulated incessant research interest worldwide due to their scientific and technological ***,anatase nitrogen-doped TiO_(2)(N-TiO_(2))nanoparticles with exposed{001}facets deposited on the graphene(GR)sheets(N-TiO_(2)-001/GR)were synthesized for the first time via a one-step solvothermal synthetic route using NH4F as the morphology-controlling *** experimental results exemplified that GR was uniformly covered with anatase N-TiO_(2) nanoparticles(10-17 nm),exposing the{001}*** percentage of exposed{001}facets in the N-TiO_(2)-001/GR nanocomposites was calculated to be ca.35%.Also,a red shift in the absorption edge and a strong absorption in the visible light range were observed due to the formation of Ti-O-C bonds,resulting in the successful narrowing of the band gap from 3.23 to 2.9 *** photocatalytic activities of the as-prepared photocatalysts were evaluated for CO_(2) reduction to produce CH,in the presence of water vapor under ambient temperature and atmospheric pressure using a low-power 15 W energy-saving daylight lamp as the visible light source--in contrast to the most commonly employed high-power xenon lamps--which rendered the process economically and practically *** all the studied photocatalysts,the N-TiO_(2)-001/GR nanocomposites exhibited the greatest CH4 yield of 3.70 p-mol'gcatalyst 1,approxi-mately 11-fold higher activity than the TiO_(2)-*** enhancement of photocatalyfic performance was ascribed to the effective charge anti-recombination of graphene,high absorption of visible light region relative to the{101}*** high catalytic activity of{001}facets.

关键词： photocatalysis nitrogen-doped TiO_(2) {001}facet acid treated solvent exfoliated graphene carbon dioxide reduction visible light

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Degradation:A critical challenge for M-N-C electrocatalysts

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Journal of Energy Chemistry 2021年第12期30卷 667-674,I0016页

作者： Yongchao Yang Leo Lai Li Wei Yuan Chen School of Chemical and Biomolecular Engineering The University of Sydney.DarlingtonNew South Wales 2006Australia

Atomically dispersed transition metal(M)and nitrogen(N)co-doped carbon(M-N-C)electrocatalysts hold excellent application potentials for several critical reactions required in electrochemical conversion processes and energy storage devices,including oxygen reduction reaction,oxygen evolution reaction,hydrogen evolution reaction,carbon dioxide reduction reaction and nitrogen reduction *** significant progress achieved in the past few decades,their commercialization is hindered by their fast *** perspective article outlines the historical development of M-N-C electrocatalysts,the current understanding of their active catalytic sites,and crucial degradation *** highlight that many methods used to tailor M-N-C electrocatalysts likely cause contradictory effects on activity and *** emphasis is needed to address their degradation issues under industryrelevant working conditions.

关键词： M-N-C Transition metal Electrocatalyst Degradation

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Tribological Properties of A356.2/RHA Composites

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Journal of Materials Science & Technology 2012年第4期28卷 367-372页

作者： D. Siva Prasad A. Rama Krishna Department of Mechanical Engineering GITAM University Visakhapatnam Andhra Pradesh India Department of Mechanical Engineering ANDHRA University Visakhapatnam Andhra Pradesh India

Rice husk ash （RHA） is one of the industrial waste byproduct available abundantly in the world. In the present work, an attempt is made to incorporate the RHA particles in the molten aluminum A356,2 alloy. The RHA particles were added into the matrix melt by creating a vortex with the help of a mechanical stirrer and the melt temperature was maintained between 800 and 850 ℃. Dry sliding wear experiments were performed in a pin on disc wear equipment against a chromium steel disc at 30 ℃. Scanning electron microscopy is used to study the wear characteristics of the unreinforced AI alloy and the A356.2/RHA composites. From the experiments it is observed that the composites exhibit higher hardness and resistance to wear as compared to unreinforced AI alloy,

关键词： Rice husk ash A356.2 Aluminum alloy Wear

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Oxygen-deficient bismuth tungstate and bismuth oxide composite photoanode with improved photostability

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Science Bulletin 2018年第15期63卷 990-996页

作者： Hoi Ying Chung Weijian Chen Xiaoming Wen Judy N. Hart Hao Wu Yuekun Lai Rose Amal Yun Hau Ng Particles and Catalysis research Croup School of Chemical Engineering The University of New South Wales (UNSW) Sydney NSW 2052 Australia School of Photovoltaic and Renewable Energy Engineering The University of New South Wales (UNSW) Sydney NSW 2052 Australia Centre for Micro-Photonics Faculty of Science Engineering and Technology Swinburne University of Technology Melbourne VIC 2122 Australia School of Materials Science and Engineering The University of New South Wales (UNSW) Sydney NSW 2052 Australia National Engineering Laboratory for Modern Silk College of Textile and Clothing Engineering Soochow University Suzhou 215123 China

A homogeneous layer of Bi_2O_3-Bi_(14)WO_(24) composite(BWO/Bi_2O_3) thin film was fabricated using a combination of electrodeposition and thermal treatment. The evenly distributed Bi14 WO24 component within the Bi_2O_3 layer was found to be important in stabilising the photoelectrochemical performances of Bi_2O_3 photoanode by promoting the photoelectron transport. The unmodified Bi_2O_3 suffered from severe photocorrosion as proven by X-ray diffraction(XRD) and inductively coupled plasma(ICP) analyses while the composite thin film was active without noticeable activity decay for at least 3 h of illumination. This strategy might be applicable to other photocatalysts with stability issues.

关键词： Bismuth oxide Bismuth tungstate Photocorrosion

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Folded graphene reinforced nanocomposites with superior strength and toughness:A molecular dynamics study

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Journal of Materials Science & Technology 2022年第25期120卷 196-204页

作者： Shaoyu Zhao Yingyan Zhang Jie Yang Sritawat Kitipornchai School of Civil Engineering The University of QueenslandSt.LuciaQLD 4072 Australia School of Engineering RMIT UniversityPO Box 71BundooraVIC 3083 Australia

Toughness and strength are important material parameters in practical structural ***,it remains a great challenge to achieve high toughness and high strength simultaneously for most ***,we report a folded graphene(FG)reinforced copper(Cu)nanocomposite that overcomes the long-standing conflicts between toughness and *** molecular dynamics simulations show that the 10%pre-strain-induced four-wave-patterned FG(1.09 wt%)reinforced Cu nanocomposite exhibits simultaneous enhancement in toughness(~13.59 J/m^(2)),ductility(~32.38%),and strength(~9.52 GPa),corresponding to 38.53%,58.88%,and 2.26%increase,respectively when compared with its counterpart reinforced by pristine graphene(PG).More importantly,the mechanical properties of FG/Cu nanocomposites can be effectively tuned by changing the pre-compressive strain,wave number,and peak number of *** toughening and strengthening mechanisms are applicable to other metal materials reinforced by other 2 D nanomaterials,opening up a new avenue for developing tough and strong metal nanocomposites.

关键词： Toughness Tensile ductility Folded graphene Cu nanocomposite Molecular dynamics simulation

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Discrete element method study of shear-driven granular segregation in a slowly rotating horizontal drum

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Particuology 2017年第3期15卷 89-94页

作者： Ram Chand Sithi V. Muniandy Chiow San Wong Jasbir Singh Department of Physics Government Girls Degree College Jhudo Mirpurkhas Sindh Pakistan Center for Theoretical and Computational Physics Department of Physics Faculty of Science University of Malaya Kuala Lumpur 50603 Malaysia Plasma Technology research Center Department of Physics Faculty of Science University of Malaya Kuala Lumpur 50603 Malaysia

Segregation and mixing of granular materials are complex processes and are not fully understood. Motivated by industrial need, we performed a simulation using the discrete element method to study size segregation of a binary mixture of granular particles in a horizontal rotating drum. Particles of two dif- ferent sizes were poured into the drum until it was 50% full. Shear-driven segregation was induced by rotating the side-plates of the drum in the opposite direction to that of the cylindrical wall. We found that radial segregation diminished in these systems but did not completely vanish. In an ordinary rotating drum, a radial core of smaller particles is formed in the center of the drum, surrounded by larger revolving particles. In our system, however, the smaller particles were found to migrate toward the side-plates. The shear from anti-spinning side-plates reduces the voidage and increases the bulk density. As such, smaller particles in the mixer tend to move to denser regions. We varied the shear by changing the coefficient of friction on the side-plates to study the influence of shear rate on this migration. We also compared the extent of radial segregation with stationary side-plates and with side-plates moving in different angular directions.

关键词： Granular flow Discrete element method Segregation Side-wall shear Rotating drum Mixing

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