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arXiv 2023年

作者： Luong, Hoang Mai Kaiyasuan, Chokchai Yi, Ahra Chae, Sangmin Kim, Brian Minki Panoy, Patchareepond Kim, Hyo Jung Promarak, Vinich Miyata, Yasuo Nakayama, Hidenori Nguyen, Thuc-Quyen Center for Polymers and Organic Solids University of California Santa BarbaraCA93106 United States Mitsubishi Chemical Center for Advanced Materials Materials Research Laboratory University of California Santa BarbaraCA93106 United States Department of Materials Science and Engineering School of Molecular Science and Engineering Vidyasirimedhi Institute of Science and Technology Rayong Wangchan21210 Thailand Department of Organic Material Science and Engineering School of Chemical Engineering Pusan National University Busan46241 Korea Republic of Organic Electronics Group Information & Electronics Technology Center R&D Division Specialty Materials Business Group Mitsubishi Chemical Corporation 1000 Kamoshida-cho Aoba-ku Kanagawa Yokohama227-8502 Japan

Shortwave infrared (SWIR) has various applications, including night vision, remote sensing, and medical imaging. SWIR organic photodetectors (OPDs) offer advantages such as flexibility, cost-effectiveness, and tunable properties, however, lower sensitivity and limited spectral coverage compared to inorganic counterparts are major drawbacks. Here, we propose a simple yet effective and widely applicable strategy to extend the wavelength detection range of OPD to a longer wavelength, using resonant optical microcavity. We demonstrate a proof-of-concept in PTB7-Th:COTIC-4F blend system, achieving external quantum efficiency (EQE) > 50 % over a broad spectrum λ = 450 – 1100 nm with a peak specific detectivity (D*) of 1.1 × 1013 Jones at λ = 1100 nm, while cut-off bandwidth, speed, and linearity are preserved. By employing a novel small-molecule acceptor IR6, a record high EQE = 35 % and D* = 4.1 × 1012 Jones are obtained at λ = 1150 nm. This research emphasizes the importance of optical design in optoelectronic devices, presenting a considerably simpler method to expand the photodetection range compared to a traditional approach that involves developing absorbers with narrow optical gaps. © 2023, CC BY-NC-SA.

关键词： Photodetectors

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Rod-Like Hierarchical Nitio3-Biobr N-N Heterojunctions with Highly Improved Visible-Light Photocatalytic Performance

SSRN

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SSRN 2023年

作者： Sun, Kaiyue Li, Mengchao Zhang, Donghai Zhou, Hualei Ma, Xiaohui Li, Wenjun Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials Department of Chemistry and Chemical Engineering University of Science and Technology Beijing Beijing100083 China State Key Laboratory of Multiphase Complex Systems Beijing100083 China

NiTiO3-BiOBr heterostructured photocatalysts were constructed via precipitation, calcination and hydrothermal treatments. Various characterizations demonstrated that BiOBr nanosheets covered on or inserted in NiTiO3 rods forming rod-like hierarchical NiTiO3-BiOBr heterojunctions. Compared with the independent NiTiO3 and BiOBr, the NiTiO3-BiOBr composites with optimal BiOBr content presented highly improved photocatalytic efficiency under visible light irradiation. The degradation rate of Rhodamine B (RhB) reached 96.6% within 1.5 h (100% in 2 h), 6.61 fold that of NiTiO3, and the degradation rate of tetracycline (TC) was 73.5% within 3 h, 1.53 times that of NiTiO3. The enhanced photocatalytic performance is attributed to the forming heterojunctions and their hierarchical structure which greatly promoted the separation of photogenerated carriers and strengthened the visible light absorption. Based on the free radical capture experiments and band position analysis, the photocatalytic mechanism of n-n heterojunction for RhB and TC degradation was deduced. The n-n junction abruptly promotes the formation of h+ and ·O2-. This work would provide a new strategy for fabricating highly efficient photocatalysts in degrading certain organic objects. © 2023, The Authors. All rights reserved.

关键词： Heterojunctions

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Machine Learning for Analyzing Atomic Force Microscopy (AFM) Images Generated from Polymer Blends

arXiv

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arXiv 2024年

作者： Paruchuri, Aanish Wang, Yunfei Gu, Xiaodan Jayaraman, Arthi Master of Science in Data Science Program University of Delaware NewarkDE19713 United States School of Polymer Science and Engineering University of Southern Mississippi 118 College Drive #5050 HattiesburgMS39406 United States Department of Chemical and Biomolecular Engineering University of Delaware 150 Academy St NewarkDE19713 United States Department of Materials Science and Engineering University of Delaware NewarkDE19713 United States Data Science Institute University of Delaware NewarkDE19713 United States

In this paper we present a new machine learning (ML) workflow with unsupervised learning techniques to identify domains within atomic force microscopy (AFM) images obtained from polymer films. The goal of the workflow is to identify the spatial location of the two types of polymer domains with little to no manual intervention (Task 1) and calculate the domain size distributions which in turn can help qualify the phase separated state of the material as macrophase or microphase ordered/disordered domains (Task 2). We briefly review existing approaches used in other fields - computer vision and signal processing - that can be applicable for the above tasks that happen frequently in the field of polymer science and engineering. We then test these approaches from computer vision and signal processing on the AFM image dataset to identify the strengths and limitations of each of these approaches for our first task. For our first domain segmentation task, we found that the workflow using discrete Fourier transform (DFT) or discrete cosine transform (DCT) with variance statistics as the feature works the best. The popular ResNet50 deep learning approach from computer vision field exhibited relatively poorer performance in the domain segmentation task for our AFM images as compared to the DFT and DCT based workflows. For the second task, for each of 144 input AFM images, we then used an existing porespy python package to calculate the domain size distribution from the output of that image from DFT-based workflow. The information and open-source codes we share in this paper can serve as a guide for researchers in the polymer and soft materials fields who need ML modeling and workflows for automated analyses of AFM images from polymer samples that may have crystalline/amorphous domains, sharp/rough interfaces between domains, or micro or macro- phase separated domains. © 2024, CC BY.

关键词： Unsupervised learning

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Rod-Like Hierarchical Nitio3-Biobr N-N Heterojunctions with Highly Improved Visible-Light Photocatalytic Performance

SSRN

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SSRN 2023年

关键词： Heterojunctions

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Fine-tuning inverse metal-support interaction boosts electrochemical transformation of methanol into formaldehyde based on density functional theory

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Chinese chemical Letters 2021年第8期32卷 2489-2494页

作者： Wenjuan Yang Junjun Li Xiaoya Cui Chenhuai Yang Yiting Liu Xianwei Zeng Zhicheng Zhang Qitao Zhang SZU-NUS Collaborative Innovation Centre for Optoelectronic Science&Technology International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin University&Collaborative Innovation Centre of Chemical Science and EngineeringTianjin 300072China Centre for Programmable Materials School of Materials Science and EngineeringNanyang Technological UniversitySingapore 639798Singapore Hanshan Normal University Chaozhou 521041China Zhe Jiang Fenghong New Material Co. LtdHuzhou 313300China

Different from traditional metal-support heterogenous catalysts,inverse heterogeneous catalysts,in which the surface of metal is decorated by metal oxide,have recently attracted increasing interests owing to the unique interracial effect and electronic ***,a deep insight into the effect of metaloxide interaction on the catalytic performance still remains a great *** our work,an inverse hematite/palladium(Fe_(2) O_(3)/Pd) hybrid nanostructure,i.e.,the active Fe_(2) O_(3) ultrathin oxide layers partially covering on the surface of Pd nanoparticles(NPs),exhibited superior electrocatalytic performance towards methanol oxidation reaction(MOR) as compared to the bare Pd NPs based on density functional theory *** charge could transfer from Pd to Fe_(2) O_(3) driven by the built-in potential at the interface of Pd and Fe_(2) O_(3),which favors the downshift of d band center of *** the assistance of interfacial hydroxyl OH*,the cleavage of O—H and C—H in CH_(3) OH could take place much easily with lower barrier ene rgy on Fe_(2) O_(3)/Pd than that on pure Pd via two electrons transferring reaction *** results highlight that the syne rgy of Pd and Fe_(2) O_(3) at the interface could facilitate the electrochemical transformation of methanol into formaldehyde assisted with interfacial hydroxyl OH*.

关键词： Inverse metal-support interaction Heterostructure Fe_(2)O_(3)/Pd Electrochemical methanol oxidation DFT

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Comment on: “Development of a CLDN18.2-targeting immuno-PET probe for non-invasive imaging in gastrointestinal tumors”

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Journal of Pharmaceutical Analysis 2023年第9期13卷 958-959页

作者： Cuicui Li Xiaoyuan Chen Jingjing Zhang Department of Diagnostic Radiology Yong Loo Lin School of MedicineNational University of SingaporeSingapore119074Singapore Clinical Imaging Research Centre Centre for Translational MedicineYong Loo Lin School of MedicineNational University of SingaporeSingapore117599Singapore Department of Nuclear Medicine Beijing Friendship Hospital Affiliated to Capital Medical UniversityBeijing100050China Nanomedicine Translational Research Program Yong Loo Lin School of MedicineNational University of SingaporeSingapore117597Singapore Departments of Surgery Chemical and Biomolecular Engineeringand Biomedical EngineeringYong Loo Lin School of Medicine and College of Design and EngineeringNational University of SingaporeSingapore119074Singapore Institute of Molecular and Cell Biology Agency for ScienceTechnologyand Research(A*STAR)61 Biopolis DriveProteosSingapore138673Singapore

In the ever-evolving landscape of cancer research and treatment,the quest for novel and non-invasive imaging techniques has become crucial for accurate diagnosis and effective *** study[1]successfully developed a good manufacturing practices(GMP)grade ^(89)Zr-labeled anti-Claudin18.2(CLDN18.2)recombinant humanized antibody TST001.^(89)Zr-DFO-TST001 exhibited high radiochemical purity(>99%)and specific activity(24.15±1.34 GBq/mmol).It demonstrated good specificity and rapid tumor accumulation in vivo and in *** immuno-PET imaging,it enables non-invasive visualization and quantification of CLDN18.2 expression level in CLDN18.2-positive gastrointestinal tumor models.

关键词： CLDN1 gastrointestinal diagnosis

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A Highly Ductile Composite of 3D-Printed Poly(Lactic Acid)With InSe Particles and Flakes as a

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SmartMat 2025年第1期6卷 155-163页

作者： Huihui Li:!Zhongiang YuI Bowen Liu-|Yang Gao-+|Ming Liu-I Jianqi Zhang-|Rodney SRuoffiD Bin Wang iD ICAS Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and Technology(NCNST)BeijingChina I 2Tianjin Key Laboratory of Molecular Optoelectronic SciencesDepartment of ChemistrySchool of SciencesTianjin UniversityTianjinChina I 3College of Mechanical EngineeringYangzhou UniversityYangzhouChina I*University of Chinese Academy of SciencesBeijingChina I'Center for Multidimensional Carbon Materials(CMCM)Institute for Basic Science(IBS)UlsanRepublic of Korea I°Department of ChemistryUlsan National Institute of Science and Technology(UNIST)UlsanRepublic of Korea I Department of Materials Science and EngineeringUlsan National Institute of Science and Technology(UNIST)UlsanRepublic of Korea I 8School of Energy and Chemical EngineeringUlsan National Institute of Science and Technology(UNIST)UlsanRepublicofKorea

The biodegradable polymer poly(lactic acid)(PLA)is ***-based composites reinforced by indium selenide(InSe)particles or flakes are prepared;each is found to have outstanding *** nanosheets are prepared by sonication of solid InSe in N-methyl pyrrolidone,followed by washing/dispersion in ethanol,and subsequent *** InSe nanosheets,or in separate studies InSe particles,are mixed with PLA to make composite *** PLA composite materials are 3D-printed into“dogbone"samples that are *** optimum dogbone specimen is 1.5 times stronger and 5.5 times tougher than neat PLA specimens prepared in the same *** the best of our knowledge,this concurrent improvement in tensile strength and toughness has not been achieved before in PLA with any fller *** element analysis,together with experimental analysis of(i)fracture surfaces,(ii)the PLA crystal structure,and(ii)the internal structure by micro-CT scanning,suggests that the exceptional mechanical performance is due to the intrinsic properties of InSe and,particularly,the emergence of crack shielding and crack deflection at the interfaces of PLA and InSe *** findings indicate that PLA-InSe composites may offer opportunities to broaden the applications of PLA composites,including as load-bearing materials.

关键词： 3D printing I InSe I PLA composites I strength I toughness

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Magnetochiral Tunneling in Paramagnetic Co1/3NbS2

arXiv

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arXiv 2024年

作者： Lim, Seongjoon Singh, Sobhit Huang, Fei-Ting Pan, Shangke Wang, Kefeng Kim, Jaewook Kim, Jinwoong Vanderbilt, David Cheong, Sang-Wook Rutgers Center for Emergent Materials Department of Physics and Astronomy PiscatawayNJ08854 United States Department of Mechanical Engineering University of Rochester RochesterNY14627 United States Materials Science Program University of Rochester RochesterNY14627 United States State Key Laboratory Base of Novel Function Materials and Preparation Science School of Material Sciences and Chemical Engineering Ningbo University Zhejiang Ningbo315211 China Department of Physics and Astronomy Rutgers University PiscatawayNJ08854 United States

Electric currents have the intriguing ability to induce magnetization in nonmagnetic crystals with sufficiently low crystallographic symmetry. Some associated phenomena include the non-linear anomalous Hall effect in polar crystals and the nonreciprocal directional dichroism in chiral crystals when magnetic fields are applied. In this work, we demonstrate that the same underlying physics is also manifested in the electronic tunneling process between the surface of a nonmagnetic chiral material and a magnetized scanning probe. In the paramagnetic but chiral metallic compound Co1/3NbS2, the magnetization induced by the tunneling current is shown to become detectable by its coupling to the magnetization of the tip itself. This results in a contrast across different chiral domains, achieving atomic-scale spatial resolution of structural chirality. To support the proposed mechanism, we used first-principles theory to compute the chirality-dependent current-induced magnetization and Berry curvature in the bulk of the material. Our demonstration of this magnetochiral tunneling effect opens up a new avenue for investigating atomic-scale variations in the local crystallographic symmetry and electronic structure across the structural domain boundaries of low-symmetry nonmagnetic crystals. © 2024, CC BY.

关键词： Magnetization

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Visualizing phase transition of upper critical solution temperature (UCST) polymers with AIE

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science China Chemistry 2021年第3期64卷 403-407页

作者： Yong-Guang Jia Kai-Feng Chen Meng Gao Sa Liu Jin Wang Xiaohui Chen Lin Wang Yunhua Chen Wenjing Song Huatang Zhang Li Ren Xiao-Xia Zhu Ben Zhong Tang School of Materials Science and Engineering National Engineering Research Center for Tissue Restoration and ReconstructionKey Laboratory of Biomedical Engineering of Guangdong ProvinceKey Laboratory of Biomedical Materials and Engineering of the Ministry of EducationInnovation Center for Tissue Restoration and ReconstructionSouth China University of TechnologyGuangzhou 510641China School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou 510006China Departement de Chimie Universite de MontrealC.P.6128Succ.Centre-villeMontrealQCH3C 3J7Canada AIE Institute Center for Aggregation-Induced EmissionKey Laboratory of Luminescence from Molecular Aggregates of Guangdong ProvinceState Key Laboratory of Lu minescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration and ReconstructionInstitute for Advanced StudyDepartment of Chemical and Biological EngineeringThe Hong Kong University of Science&TechnologyHong KongChina

The stimuli-responsive polymers with upper critical solution temperatures(UCST) are highly attractive for drug delivery applications. However, the phase transition process of UCST polymer is usually characterized by turbidity measurement and electron microscopy, which are significantly restricted by low sensitivity and static observation. In contrary, the fluorescence technique has significant advantages in terms of high sensitivity, easy operation, and dynamic observation. However, the conventional fluorophores suffer from the drawbacks of aggregation-caused quenching(ACQ) after being encapsulated by UCST polymers, which are not suitable for direct visualization of the phase transition process. To tackle this challenge, we herein developed a series of UCST polymers based on polyacrylamides decorated with bile acid and aggregation-induced emission(AIE)-active tetraphenylethene(TPE) groups, which can be used for direct fluorescence monitoring of the phase transition process. Moreover, the AIE-active UCST polymers can serve as drug carriers, which can not only monitor the drug release process under thermal stimuli, but also verify the drug release by fluorescence recovery after thermal stimuli. It is expected that the AIE-active UCST polymers with self-monitoring ability are promising for biomedical applications.

关键词： upper critical solution temperatures aggregation-induced emission phase transition process drug release monitoring bile acid

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Toward a Two-Dimensional Supramolecular Organic Framework with High Degree of Internal Order via Amphiphilic Modification

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CCS Chemistry 2022年第1期4卷 141-150页

作者： Zhi-Jian Yin Shu-Yan Jiang Na Liu Qiao-Yan Qi Zong-Quan Wu Tian-Guang Zhan Xin Zhao Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules Center for Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032 Department of Polymer Science and Engineering School of Chemistry and Chemical EngineeringHefei University of TechnologyAnhui ProvinceHefei 230009 Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Life SciencesZhejiang Normal UniversityJinhua 321004

Solution-phase self-assembly of two-dimensional(2D)networks with a high degree of internal order and long-range periodicity is a great ***,we report a rational design to improve 2D self-assembly in water through amphiphilic modification of the building *** amphiphilic tritopic molecule(1)is designed and synthesized by introducing three hydrophilic oligo(ethylene glycol)moieties and three hydrophobic hexyl *** assembly of 1 and cucurbit[8]uril(CB[8])leads to the formation of a Janus 2D supramolecular organic framework(SOF),which further creates unique bilayer supramolecular networks and exhibits an unprecedentedly high degree of internal order and long-range *** contrast,the assembly of a nonamphiphilic analog(2)with CB[8]only generates a 2D SOF with a lower degree of internal order,suggesting that the inherent amphiphilicity of 1 plays a crucial role in improving its 2D self-assembly in aqueous phase.

关键词： self-assembly supramolecular organic frameworks two-dimensional amphiphilicity internal order

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