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Enhancing photodynamic inactivation via tunning spatial constraint on photosensitizer

Science China Chemistry 2024年第2期67卷 652-663页

作者： Chong Li Minghao Han Ji Gao Shuxian Wang Song-Bo Lu Yaxi Li Zhao Liu Chen Zhang Zhaojin Wang Fangliang Wang Yuang Sun Chun Loong Ho Kai Wang Yun Shen Kai Li Shenzhen Key Laboratory of Smart Healthcare Engineering Guangdong Provincial Key Laboratory of Advanced BiomaterialsDepartment of Biomedical EngineeringSouthern University of Science and TechnologyShenzhen518055China Department of Chemical and Environmental Engineering University of California RiversideRiverside92521USA Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen518055China

The critical factor of spatial constraint,provided by the external confinement(e.g.,matrix),is often overlooked during photodynamic inactivation,despite playing a crucial role in determining the molecular photophysical process and subsequent antipathogen ***,as a proof-of-concept model,we employed two types of polymers with varying interaction energies with dopants to investigate the intrinsic relationship between spatial constraint and the essential excited-state behaviors of doped photosensitizer(4-(2-(5-(4-(diphenylamino)phenyl)thiophen-2-yl)ethyl)-1-methylquinolin-1-ium iodine,TPP).Through experimental investigation and theoretical calculations,we found that TPP tends to remain in the excited state for a shorter dwell time under weaker spatial constraints due to less restricted molecular motion in polyurethane(PU) ***,the singlet oxygen(^(1)O_(2)) generated from doped-TPP shows a 9.23-fold enhancement in PU than in the polyvinylchloride(PVC) *** light irradiation,the PU@TPP nanofiber can efficiently eliminate the coronavirus MHV-A59(≥99.9997%) at a 220,000-fold higher concentration than the infected *** antibacterial efficacy has also been demonstrated,with a killing rate of ≥99%.

关键词： photodynamic antibacterial singlet oxygen triphenylamine nanofiber

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Composition and state prediction of lithium-ion cathode via convolutional neural network trained on scanning electron microscopy images

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npj Computational Materials 2024年第1期10卷 2337-2345页

作者： Jimin Oh Jiwon Yeom Benediktus Madika Kwang Man Kim Chi Hao Liow Joshua C.Agar Seungbum Hong Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Korea ICT Creative Laboratory Electronics and Telecommunications Research Institute(ETRI)218 Gajeong-roYuseong-guDaejeon 34129Korea Department of Mechanical Engineering and Mechanics Drexel University3141 Chestnut StreetPhiladelphiaPA 19104USA KAIST Institute for NanoCentury(KINC) Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Korea Department of Smart Mobility Engineering Advanced Institute of Science and TechnologyKyungpook National UniversityDaegu 41566Korea

High-throughput materials research is strongly required to accelerate the development of safe and high energy-density lithium-ion battery(LIB)applicable to electric vehicle and energy storage *** artificial intelligence,including machine learning with neural networks such as Boltzmann neural networks and convolutional neural networks(CNN),is a powerful tool to explore next-generation electrode materials and functional additives.

关键词： neural networks artificial

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Impact of nano fillers on the mechanical and rheological behaviour of polydimethylsiloxane based nanocomposite elastomer

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Ceramics International 2025年第14期51卷 18852-18864页

作者： Mandal, Swaroop Kumar Kumar, Rahul Pradhan, Asisha Ranjan Kumar, Deepak Kumar, Satish Department of Automation and Robotics Dr. DY Patil Institute of Technology Pimpri Pune411018 India Advanced Composite and Smart Material Laboratory Department of Mechanical Engineering National Institute of Technology Jamshedpur 831014 India Department of Mechanical Engineering Parala Maharaja Engineering College Odisha 761003 India Rheology Lab Department of Mechanical Engineering National Institute of Technology Jamshedpur 831014 India

In this work, an advanced elastomer which is reinforced with nanocomposite of reduced graphene oxide and calcium carbonate (rGO/CaCO3) is fabricated. Its mechanical and rheological properties are investigated experimentally. The effect of rGO/CaCO3 nanocomposite was experimentally investigated using Dynamical Mechanical Analysis (DMA), Tensile test and Rheological test. The results indicate improved adhesion and physical strengthening effect between rGO/CaCO3 nanocomposite and the PDMS, that leads towards the decrement of extensional loss factor and hence increment in the extensional storage modulus. Also, the ultimate tensile stress and percentage elongation of the elastomers was found to be increased with increasing wt. % of rGO in CaCO3. It has been observed that 5 % rGO/CaCO3 nanocomposite in PDMS exhibits a higher tensile stress of 0.81 ± 0.040 MPa in comparison to pure PDMS (0.48 ± 0.024 MPa). The bare PDMS material has a maximum force of 12.94 ± 0.647 N, but the 5 % rGO/CaCO3/PDMS nanocomposite can tolerate a maximum force of 22.1 ± 1.105 N. Furthermore, the rheological properties of the material were altered, resulting in an increase in the viscosity of PDMS as the percentage (%) of rGO concentration in the rGO/CaCO3 nanocomposite increased. The presence of CaCO3 increases viscosity, however when 4 % (wt. %) rGO is added to CaCO3, the viscosity decreases compared to other filler concentrations in the elastomers. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Polydimethylsiloxane

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Nanoimprint lithography-assisted block copolymer self-assembly for hyperfine fabrication of magnetic patterns based on L10-FePt nanoparticles

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Science China Chemistry 2025年第5期68卷 2027-2034页

作者： Jie Zhang Yi Chen Guijun Li Zelin Sun Zhengong Meng Wai-Yeung Wong Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy The Hong Kong Polytechnic University The Hong Kong Polytechnic University Shenzhen Research Institute Division of Integrative Systems and Design and Department of Electronic and Computer EngineeringThe Hong Kong University of Science and Technology School of Flexible Electronics (Future Technology) and Institute of Advanced Materials (IAM) Nanjing Tech University

L10-FePt-type bit-patterned media has provided a promising alternative for ultrahigh-density magnetic recording systems in the current digital era, but rapid fabrication of magnetic patterns with hyperfine bit islands is still challenging, especially with the target for miniaturization and scalable production simultaneously. Herein, Fe,Pt-containing block copolymers were utilized as single-source precursors for solution-processable patterning and subsequent generation of the demanding magnetic FePt dots by in situ pyrolysis. High-throughput nanoimprint lithography was initially employed to fabricate the predefined bit cells precisely,and then the intrinsic self-assembly of phase-separated block copolymers further drove the formation of accurate bit *** from the synergistic effect of top-down lithographic approach and bottom-up self-assembly, the customizable patterns could be achieved for large-scale mass production in targeted areas, but high-density isolated dots could also be accurately aligned along the patterned features after subsequent self-assembly. This reliable strategy would provide a good avenue to precisely construct ultrahigh-density magnetic data storage devices.

关键词： organometallic precursor magnetic nanoparticles block copolymer self-assembly nanoimprint lithography

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Methylthio side-chain modified quinoidal benzo-[1,2-b:4,5-b']dithiophene derivatives for high-performance ambipolar organic field-effect transistors

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Science China Chemistry 2024年第10期67卷 3357-3365页

作者： Li Chen Xiaoqi Luo Nuoya Li Shaoqian Peng Qing Jiang Di Wu Jianlong Xia State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and DevicesWuhan University of TechnologyWuhan 430070China School of Chemistry Chemical Engineering and Life ScienceWuhan University of TechnologyWuhan 430070China Department of Chemistry National University of SingaporeSingapore 117543Singapore

Quinoidal small molecule semiconductors hold huge potential in ambipolar organic field-effect transistors(OFETs)and organic spintronic ***,two quinoidal molecules with methylthio side chains were synthesized to develop molecular semiconductors with high ambipolar mobility,designated QBDTS and *** theoretical calculation results reveal that QBDTS has a closed-shell structure while QTBDTS showed an open-shell structure with a biradical character(y0)of 0.46 and its magnetic properties were further investigated using electron paramagnetic resonance(EPR)and superconducting quantum interference device(SQUID)*** methyl side chains showed a large impact on the molecular orbital *** HOMO/LUMO levels of QBDTS and QTBDTS were measured to be-5.66/-4.56 and-5.27/-4.48 eV,respectively,which are favorable for ambipolar charge transport in ***,the spin-coated QBDTS displayed hole and electron mobilities of 0.01 and 0.5 cm^(2)V^(-1)s^(-1)while QTBDTS showed a record high hole mobility of 1.8 cm^(2)V^(-1)s^(-1)and electron mobility of 0.3 cm^(2)V^(-1)s^(-1).Moreover,comparative studies of the thin film morphologies also manifested the beneficial influence of methyl side chains on film crystallinity and molecule *** results strongly proved that methyl side chain engineering can be a simple but efficient strategy for modulating electronic properties and molecular stacking *** work also represents a big advancement for quinoidal molecular semiconductors in ambipolar OFET applications.

关键词： side-chain modification quinoidal molecules ambipolar diradicals organic field-effect transistors

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Purification of water using TiO2/g-C3N5 nanocomposite: A visible light assisted photocatalytic activity

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Zeitschrift fur Physikalische Chemie 2024年第10期238卷 1931-1941页

作者： Chandrasekar, Jayashree Venkatesan, Manikandan Lin, Ja-Hon Kuo, Chi-Ching Institute of Organic and Polymeric Materials Research and Development Center of Smart Textile Technology National Taipei University of Technology Taipei10608 Taiwan Advanced Nanophotonics Technology Lab Department of Electro-Optical Engineering National Taipei University of Technology Taipei10608 Taiwan

Tetracycline hydrochloride (TCN), widely recognized for its broad-spectrum efficacy and cost-effectiveness as an antibiotic, has raised significant environmental and health concerns due to its contamination in water bodies. This study introduces an innovative approach to address this issue by employing a titanium dioxide/graphitic carbon nitride (TiO2/g-C3N5) nanocomposite through photocatalysis. The synthesis of this composite involved a hydrothermal method, and a comprehensive characterization was conducted using XRD, FT-IR, and SEM techniques. The formed heterojunction between TiO2 and g-C3N5 exhibited remarkable photocatalytic degradation capabilities, achieving a removal rate of over 85% within a short period of 135min. This signifies the composite's efficiency in breaking down TCN in aqueous environments. Beyond its high effectiveness, the TiO2/g-C3N5 nanocomposite presents itself as an environmentally friendly and sustainable solution for addressing the critical issues associated with antibiotic contamination in water. This study underscores the potential of photocatalysis using TiO2/g-C3N5 as a promising technology for mitigating the adverse effects of TCN on both ecosystems and human health. © 2024 Walter de Gruyter GmbH, Berlin/Boston.

关键词： Titanium dioxide

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In-situ understanding on the formation of fibrillar morphology in green solvent processed all-polymer solar cells

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National Science Review 2024年第12期11卷 244-253页

作者： Ruijie Ma Hongxiang Li Top Archie Dela Pe?a Heng Wang Cenqi Yan Pei Cheng Jiaying Wu Gang Li Department of Electrical and Electronic Engineering Research Institute for Smart Energy (RISE)Photonic Research Institute (PRI) The Hong Kong Polytechnic University College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering Sichuan University Function Hub Advanced Materials Thrust The Hong Kong University of Science and Technology

Solid additive engineering has been intensively explored on morphology tuning for highly efficient all-polymer solar cells（all-PSCs）, a promising photovoltaic technology towards multi-scenario *** the nano-fibrillar network of the active layer induced by additive treatment is confirmed as the key factor for power conversion efficiency（PCE） of all-PSCs, its formation mechanism is not clearly revealed,for lack of precise and convincing real-time observation of crystallization and phase separation during the liquid-to-solid transition process of spin-coating. Herein we report an in-situ grazing incidence wide-angle/small-angle X-ray scattering（GIWAXS/GISAXS） screening that reveals the fact that naphthalene derived solid additives can suppress the aggregation of the polymer acceptor（PY-IT） at the beginning stage of spin coating, which provides sufficient time and space for the polymer donor（PM6） to form the fibril structure. Moreover, guided by this knowledge, a ternary all-polymer system is proposed,which achieves cutting-edge level PCEs for both small-area（0.04 cm2）(also decent operational stability)and large-area（1 cm2） devices.

关键词： all-polymer solar cells morphology screening naphthalene-based solid additives phase segregation

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Autonomous self-healing in a stretchable polybutadiene-based urethane and eutectic gallium indium conductive composite

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npj Flexible Electronics 2024年第1期8卷 74-88页

作者： Tran Duc Khanh Jinho Joo Jong-Woong Kim Department of Smart Fab Technology Sungkyunkwan UniversitySuwonSouth Korea School of Advanced Materials Science&Engineering Sungkyunkwan UniversitySuwonSouth Korea Department of Semiconductor Convergence Engineering Sungkyunkwan UniversitySuwonSouth Korea School of Mechanical Engineering Sungkyunkwan UniversitySuwonSouth Korea

In the burgeoning field of wearable electronics,flexible and durable conductors that can maintain consistent electrical properties under various conditions are critically *** research introduces a novel composite material comprising eutectic gallium-indium(EGaIn)and a polybutadiene-based urethane(PBU)specifically designed to address this ***,renowned for its superior conductivity due to its liquid state at room temperature,is strategically combined with PBU,which offers inherent flexibility and remarkable self-healing capabilities derived from reversible Diels–Alder ***,the composite maintains exceptional electrical resistance stability,withstanding mechanical strains up to 135%without compromising *** material’s self-healing capability is attributed to the autonomous mending properties of EGaIn and the reversible Diels–Alder reactions in the PBU *** result is an efficient restoration of the composite’s original properties upon incurring ***,the composite’s adaptability is showcased through its printability,allowing for precise patterning conducive to custom-designed wearable devices.

关键词： eutectic wear composite

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Flexible thermocouple using a thermoelectric graphene fiber with a seamless junction

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Journal of Materials Science & technology 2024年第5期172卷 15-22页

作者： Seungwon Kim Soomook Lim Myeong Hee Jeong Wonjoon Kim Seunghyun Baik Ji Won Suk School of Mechanical Engineering Sungkyunkwan UniversitySuwonGyeonggi-do 16419Republic of Korea Department of Smart Fab.Technology Sungkyunkwan UniversitySuwonGyeonggi-do 16419Republic of Korea SKKU Advanced Institute of Nanotechnology(SAINT) Sungkyunkwan UniversitySuwonGyeonggi-do 16419Republic of Korea

Temperature is an important physical variable that indicates the condition of the human body and artificial *** wearable applications require the development of temperature sensors with different form *** this study,a fiber-shaped thermoelectric temperature sensor is fabricated using a continuous graphene fiber whose two halves possess different reduction states.A seamless junction is formed by partially reducing a wet-spun graphene oxide fiber with hydroiodic acid(HI)solutions of different ***-half of the fiber is mildly reduced with 0.97 wt%HI,while the other half is highly reduced with 30.6 wt%*** different reduction states of the graphene composite fiber result in different Seebeck coefficients,allowing for the fabrication of a fiber-shaped graphene thermocou-ple without any laborious *** flexible graphene thermocouple exhibits high sensitivity with a thermopower of 12.5μV K^(-1)in the temperature range of room temperature to∼70℃.Furthermore,it exhibits high linearity with a correlation coefficient exceeding 0.995 and fast response with a time constant of 0.24 *** to its mechanical robustness and flexibility,the stand-alone graphene ther-mocouple can be knitted into a cotton fabric glove,which presents a fast response to environmental changes without any external power *** work offers a unique fabrication method for producing a high-performance,flexible thermocouple that features a seamless and clear junction without the use of additional *** alternative method eliminates the complicated assembly processes typically required for conventional thermocouples.

关键词： Graphene fiber Thermocouple Reduced graphene oxide Flexible temperature sensor Seebeck coefficient

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Robust Stability and Stabilizability Conditions for Time-Delay Systems Under Stochastic Uncertainties

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IEEE Transactions on Automatic Control 2024年第6期70卷 4037-4044页

作者： Chen, Jianqi Mao, Qi Zhao, Di Chen, Chao Nanjing University Center for Advanced Control and Smart Operations Suzhou China Nanjing Normal University School of Electrical and Automation Engineering Nanjing China Tongji University Department of Control Science and Engineering Shanghai Institute of Intelligent Science and Technology Shanghai China Leuven3001 Belgium

This study first explores the mean-square robust stability problem of stable continuous-time linear time-invariant systems subject to stochastic multiplicative uncertainties with prescribed variance bounds. The internal structures of uncertainties, however, are not presumed to cope with diverse random noises and errors arising from networked channels. A necessary and sufficient mean-square stability condition is obtained involving a novel small-gain type characterization. Next, we consider the output feedback controller synthesis problem of networked control systems facing stochastic multiplicative uncertainties and intrinsic channel-wise time delays simultaneously. Based on the obtained mean-square stability condition, further, we develop a fundamental necessary and sufficient condition of mean-square stabilizability explicitly. Such a condition equivalently determines that an open-loop unstable system can be stabilized by output feedback in the mean-square sense. Finally, an analysis of delay robustness is elaborated, in which the mean-square stabilizability condition is extended to the case tolerating uncertain but upper-bounded time delays. Overall, this study provides a comprehensive analysis of the robust mean-square stability and mean-square stabilizability of time-delay systems under stochastic uncertainties, which can have practical implications for networked control systems. © 1963-2012 IEEE.

关键词： Continuous time systems

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