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Optimizing polylactic acid:synthesis,properties,and regulatory strategies for food packaging applications

Frontiers of Chemical Science and engineering 2025年第3期19卷 69-97页

作者： Peng Sun Kelan Liu Cunjun Dong Li Yan Hongyan Zhu Mingliang Fang Donglei Fu Xinghai Liu Wuhan Hongzhicai Printing Co. Ltd.Wuhan 430040China Hubei Engineering Technology Research Center of Spectrum and Imaging Instrument Electronic Information SchoolWuhan UniversityWuhan 430072China

Polylactic acid,a biodegradable polymer derived from renewable resources,is increasingly used in food packaging due to its transparency,renewability,and food ***,its mechanical properties,heat resistance,and barrier performance present significant challenges that limit its ***,there is a lack of comprehensive literature addressing methods to optimize polylactic acid’s performance for various food packaging ***,this review provides an overview of polylactic acid production processes,including the synthesis of lactic acid and lactide,as well as methods such as polycondensation and ring-opening *** critically examine the advantages and limitations of polylactic acid in various food packaging contexts,focusing on strategies to enhance its mechanical properties,barrier performance against oxygen and water vapor,surface hydrophobicity,thermal stability,and resistance to ultraviolet ***,we summarize recent advancements in polylactic acid applications for food packaging,highlighting innovations in antioxidant,antimicrobial,and freshness indicator *** developments underscore the significant potential of polylactic acid in the food packaging sector and offer valuable insights for future research directions.

关键词： polylactic acid,biodegradable packaging materials,mechanical property,barrier property,food packaging applications

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research of synthesis and neural network training on double quantum dot colorimetric fluorescent probe for freshness detection

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Frontiers of Chemical Science and engineering 2024年第10期18卷 145-157页

作者： Caihong Lv Yuewei Zheng Zhihao Guan Jun Qian Houbin Li Xinghai Liu Hubei Engineering Technology Research Center of Spectrum and Imaging Instrument Electronic Information SchoolWuhan UniversityWuhan 430072China School of Nursing Wuhan UniversityWuhan 430072China

There are many disadvantages such as small detection range and environmental restrictions on application conditions,when the single quantum dot powder or solution is used for fluorescent probe *** this paper,the blue fluorescent silicon quantum dots and green fluorescent carbon quantum dots were prepared,and their fluorescence color changes after mixing in different proportions were investigated under different pH *** the two quantum dots were mixed with a concentration of 0.1 mg·mL^(-1) and a mass ratio of 1:1,the fluorescence color change could be better displayed at a pH from 1 to ***,the double quantum dots were prepared into two forms(ink and film),successfully realizing the device application of the fluorescent *** films and inkjet-printed labels were used to test the spoilage of food(pork,milk,etc.),and the color change data of the labels were collected during the spoilage *** data were used for neural network training to predict the spoilage changes of foods.

关键词： silicon quantum dots carbon quantum dots fluorescent probe pH freshness

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Time-Dependent Phosphorescence from Carbon Dots Enables Multidimensional Photoactivated Printing and Tunable Molecular Calculations

SSRN

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SSRN 2024年

作者： Zeng, Jianwen Tang, Zhaorun Yin, Junping Guan, Zhihao Wei, Ruyi Ke, Xianwen Liu, Xinghai Hubei Engineering Technology Research Center of Spectrum and Imaging Instrument School of Electronic Information Wuhan University Wuhan430072 China Wuhan Danyaxiang Biological Technology Co. Ltd. Wuhan430070 China

Room temperature phosphorescence (RTP) materials exhibit fascinating optical properties with great potential for various applications in the fields of luminescent displays and information encryption. However, most afterglow materials rely on pre-processing techniques such as molding and inkjet printing, greatly limiting the portability of their applications. In this study, we propose a reversible photoactivated phosphorescent anti-counterfeiting material. A dynamic photo-printable afterglow film that can be naturally erased was developed by doping carbon dots (CD) of ofloxacin into polylactic acid (PLA). The material exhibits a 15s yellow-to-green dynamic afterglow, while the lifetime of the material jumps from 2.5ms to a maximum of 625ms under continuous UV irradiation for less than 60s. Characterization results showed that dynamic RTP originated from external oxygen-containing functional groups and internal nitrogen heterocycles with different decay rates within CDs. Further studies suggest that photoactivation properties should be attributed to the highly oxygen permeable but UV responsive structure of PLA. While oxygen in the membrane was excited by UV light, cross-linking occurs between PLA molecules, providing a rigid environment for CDs and limiting the subsequent entry of oxygen, further extending its lifetime. Based on the above advantages, this dynamic afterglow material has been successfully applied in light-emitting displays and optical molecular logic operation unit design. © 2024, The Authors. All rights reserved.

关键词： Phosphorescence

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Superior Color ‘Paper-Based Displayer’ for Advanced Anti-Counterfeiting and Multiple Information Encryption

SSRN

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SSRN 2024年

作者： Li, Zhi Chen, Zhengjie Qian, Jun Ke, Xianwen Liu, Xinghai Hubei Engineering Technology Research Center of Spectrum and Imaging Instrument Electronic Information School Wuhan University Wuhan430072 China School of Nursing Wuhan University Wuhan430072 China Wuhan Institute of Quantum Technology Wuhan430206 China

Fluorescent printing have gained considerable attention for their unique optical properties and potential applications in displays and information security. However, existing research faces challenges related to monochromatic printing, particularly due to energy transfer, inner filter effects, and aggregation-induced *** address these challenges, this study leverages EC as a binder, which forms a semi-transparent film upon drying, effectively isolating the CDs and mitigating detrimental energy transfer. Through systematic color tuning and performance optimization, we developed a tricolor CDs-based fluorescent ink capable of high-fidelity color reproduction - Superior Color ‘Paper-based Displayer’. Moreover, according to the excitation-dependent characteristics of the ink, colorful dynamic anti-counterfeiting patterns and multiple information encryption technology are designed. This work advances the prospects of full-color fluorescent printing for image restoration, security, and high-performance functional inks. © 2024, The Authors. All rights reserved.

关键词： Fluorescence

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The 5th International Conference on Biomedical engineering and Biotechnology (ICBEB 2016) Abstracts

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BMC MEDICAL imaging 2016年第SUPPL 1期16卷 65-65页

作者： [Anonymous] Department of MRI Shandong Medical Imaging Research Institute Affiliated to Shandong University Jinan Shandong 250021 People’s Republic of China Department of Interventional Radiology Shandong Provincial Hospital Affiliated to Shandong University Jinan Shandong 250021 People’s Republic of China College of Information Science and Technology Engr. Research Center of Digitized Textile & Fashion Tech. for Ministry of Education Donghua University Shanghai 201620 China Intelligent multimedia information processing Lab College of Software Northeastern University Shenyang Liaoning Province 110004 China Institute of Biomedical and Health Engineering Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China School of Computer Science and Technology Nanjing Normal University Nanjing China Department of Electrical Engineering The City College of New York CUNY New York USA Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing Nanjing China School of Electronic Science and Engineering Nanjing University Nanjing Jiangsu 210046 China College of Engineering Nanyang Technological University Singapore 639798 Singapore School of Electronic Information Shanghai Dianji University Shanghai China School of Natural Sciences and Mathematics Shepherd University Shepherdstown WV 25443 USA Davis College of Agriculture Natural Resources and Design West Virginia University Morgantown WV 26505 USA State Key Laboratory of Millimeter Waves Southeast University Nanjing 210096 China Center of Medical Physics and Technology Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei China College of Agricultural and Life Sciences University of Florida Gainesville FL 32611 USA Courant Institute of Mathematical Sciences New York University New York NY 10012 USA Translational Imaging Division & MRI Unit Columbia University and New York State Psychiatric Institute New York NY 10032 USA Guangxi Key Laboratory of Manufacturing System & Adv

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Temperature-driven Emergence of Negative Photoconductivity in Semimetal MoTe2Film Probed with Terahertz Spectroscopy

arXiv

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arXiv 2021年

作者： Chen, Jiaming Suo, Peng Zhang, Wenjie Ma, Hong Fu, Jibo Li, Di Lin, Xian Yan, Xiaona Jin, Zuanming Liu, Weiming Ma, Guo-Hong Yao, Jianquan Department of Physics Shanghai University Shanghai200444 China School of Physics and Electronics Shandong Normal University Jinan250014 China Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation Center Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology 516 JunGong Road Shanghai200093 China School of Physical Science and Technology ShanghaiTech University Shanghai201210 China Institute of Laser and Opto-electronics College of Precision Instrument and Opto-electronics Engineering Tianjin University Tianjin300072 China STU & SIOM Joint Laboratory for Superintense Lasers and the Applications Shanghai201210 China

Layered two-dimensional (2D) materials MoTe2have been paid special attention due to the rich optoelectronic properties with various phases. The nonequilibrium carrier dynamics as well as its temperature dependence in MoTe2are of prime importance, as it can shed light on understanding the anomalous optical response and potential applications in far infrared (IR) photodetection. Hereby, we employ time-resolved terahertz (THz) spectroscopy to study the temperature dependent nonequilibrium carrier dynamics in MoTe2films. After photoexcitation of 1.59 eV, the 1T'-phase MoTe2at high temperature behaves only THz positive photoconductivity (PPC) with relaxation time of less than 1 ps. In contrast, the Td-phase MoTe2at low temperature shows ultrafast THz PPC initially followed by emerging THz negative photoconductivity (NPC), and the THz NPC signal relaxes to the equilibrium state in hundreds of ps time scale. Small polaron formation induced by hot carrier has been proposed to be ascribed to the THz NPC in the polar semimetal MoTe2at low temperature. The polaron formation time after photoexcitation increases slightly with temperature, which is determined to be ∼0.4 ps at 5 K and 0.5 ps at 100 K. Our experimental result demonstrates for the first time the dynamical formation of small poalron in MoTe2Weyl semimetal, this is fundamental importance on the understanding the temperature dependent electron-phonon coupling and quantum phase transition, as well as the designing the MoTe2-based far IR photodetector. © 2021, CC BY.

关键词： Terahertz spectroscopy

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Magnetic Modulation of Terahertz Waves via Spin-Polarized Electron Tunneling Based on Magnetic Tunnel Junctions

引用

Physical Review Applied 2020年第1期14卷 014032-014032页

作者： Zuanming Jin Jugeng Li Wenjie Zhang Chenyang Guo Caihua Wan Xiufeng Han Zhenxiang Cheng Chao Zhang Alexey V. Balakin Alexander P. Shkurinov Yan Peng Guohong Ma Yiming Zhu Jianquan Yao Songlin Zhuang Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation Center Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology 516 JunGong Road Shanghai 200093 China Department of Physics Shanghai University 99 Shangda Road Shanghai 200444 China Shanghai Institute of Intelligent Science and Technology Tongji University Shanghai 200092 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100190 China Institute for Superconducting and Electronic Materials University of Wollongong Wollongong New South Wales 2500 Australia School of Physics University of Wollongong Wollongong New South Wales 2522 Australia Department of Physics and International Laser Center Lomonosov Moscow State University Leninskie Gory 1 Moscow 19991 Russia STU & SIOM Joint Laboratory for Superintense Lasers and Applications Shanghai 201210 China College of Precision Instrument and Optoelectronics Engineering Tianjin University Tianjin 300110 China

Magnetic tunnel junctions (MTJs) are a key technology in modern spintronics because they are the basis of read-heads of modern hard disk drives, nonvolatile magnetic random access memories, and sensor applications. In this paper, we demonstrate that tunneling magnetoresistance can influence terahertz (THz) wave propagation through a MTJ. In particular, various magnetic configurations between parallel state and antiparallel state of the magnetizations of the ferromagnetic layers in the MTJ have the effect of changing the conductivity, making a functional modulation of the propagating THz electromagnetic fields. Operating in the THz frequency range, a maximal modulation depth of 60% is reached for the parallel state of the MTJ with a thickness of 77.45 nm, using a magnetic field as low as 30 mT. The THz conductivity spectrum of the MTJ is governed by spin-dependent electron tunneling. It is anticipated that the MTJ device and its tunability scheme will have many potential applications in THz magnetic modulators, filtering, and sensing.

关键词： Magnetoresistance Photoconductivity Ultrafast magnetic effects Magnetic tunnel junctions Terahertz time-domain spectroscopy

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Learn2Reg: comprehensive multi-task medical image registration challenge, dataset and evaluation in the era of deep learning

arXiv

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arXiv 2021年

作者： Hering, Alessa Hansen, Lasse Mok, Tony C.W. Chung, Albert C.S. Siebert, Hanna Häger, Stephanie Lange, Annkristin Kuckertz, Sven Heldmann, Stefan Shao, Wei Vesal, Sulaiman Rusu, Mirabela Sonn, Geoffrey Estienne, Théo Vakalopoulou, Maria Han, Luyi Huang, Yunzhi Yap, Pew-Thian Brudfors, Mikael Balbastre, Yaël Joutard, Samuel Modat, Marc Lifshitz, Gal Raviv, Dan Lv, Jinxin Li, Qiang Jaouen, Vincent Visvikis, Dimitris Fourcade, Constance Rubeaux, Mathieu Pan, Wentao Xu, Zhe Jian, Bailiang De Benetti, Francesca Wodzinski, Marek Gunnarsson, Niklas Sjölund, Jens Grzech, Daniel Qiu, Huaqi Li, Zeju Thorley, Alexander Duan, Jinming Großbröhmer, Christoph Hoopes, Andrew Reinertsen, Ingerid Xiao, Yiming Landman, Bennett Huo, Yuankai Murphy, Keelin Lessmann, Nikolas van Ginneken, Bram Dalca, Adrian V. Heinrich, Mattias P. Institute of Medical Informatics Universität zu Lübeck Ratzeburger Allee 160 Lübeck23562 Germany Fraunhofer MEVIS Institute for Digital Medicine Lübeck23562 Germany Department of Radiology and Nuclear Medicine Radboud University Medical Center GA Nijmegen6525 Netherlands The Institute of Medical Informatics Universität zu Lübeck Lübeck23562 Germany The Department of Computer Science and Engineering The Hong Kong University of Science and Technology Hong Kong The Fraunhofer MEVIS Institute for Digital Medicine Lübeck23562 Germany The Department of Radiology Stanford University StanfordCA94305 United States The Department of Urology Stanford University StanfordCA94305 United States The Université Paris-Saclay CentraleSupélec Mathématiques et Informatique pour la Complexité et les Systèmes Inria Saclay Gif-sur-Yvette 91190 France Université Paris-Saclay Institut Gustave Roussy Inserm Radiothérapie Moléculaire et Innovation Thérapeutique Villejuif94800 France The Université Paris-Saclay CentraleSupélec Mathématiques et Informatique pour la Complexité et les Systèmes Inria Saclay Gif-sur-Yvette91190 France The Department of Radiology and Nuclear Medicine Radboud University Medical Center Nijmegen6525 GA Netherlands The School of Automation Nanjing University of Information Science and Technology Nanjing210044 China The School of Biomedical Engineering and Imaging Sciences King’s College London London United Kingdom The Athinoula A. Martinos Center for Biomedical Imaging Massachusetts General Hospital United States Harvard Medical School Boston United States The King’s College London United Kingdom The Tel Aviv University The Britton Chance Center for Biomedical Photonics Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology Hubei Wuhan430074 China MoE Key Laboratory for Biomedical Photonics Collaborative Innovation Center for Biomedical Engineering School of Engineering Sciences Huazhong University of Sci

Image registration is a fundamental medical image analysis task, and a wide variety of approaches have been proposed. However, only a few studies have comprehensively compared medical image registration approaches on a wide range of clinically relevant tasks. This limits the development of registration methods, the adoption of research advances into practice, and a fair benchmark across competing approaches. The Learn2Reg challenge addresses these limitations by providing a multi-task medical image registration data set for comprehensive characterisation of deformable registration algorithms. A continuous evaluation will be possible at https://***. Learn2Reg covers a wide range of anatomies (brain, abdomen, and thorax), modalities (ultrasound, CT, MR), availability of annotations, as well as intra- and inter-patient registration evaluation. We established an easily accessible framework for training and validation of 3D registration methods, which enabled the compilation of results of over 65 individual method submissions from more than 20 unique teams. We used a complementary set of metrics, including robustness, accuracy, plausibility, and runtime, enabling unique insight into the current state-of-the-art of medical image registration. This paper describes datasets, tasks, evaluation methods and results of the challenge, as well as results of further analysis of transferability to new datasets, the importance of label supervision, and resulting bias. While no single approach worked best across all tasks, many methodological aspects could be identified that push the performance of medical image registration to new state-of-the-art performance. Furthermore, we demystified the common belief that conventional registration methods have to be much slower than deep-learning-based methods. © 2021, CC BY.

关键词： Image registration

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