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Matrix-Free Quantum Dot-Deposited Films with Perfect Color Conversion for Automotive Taillights

Advanced materials Technologies 2025年

作者： Ahn, Hyerim Oh, Jong-Min Shin, Weon Ho Kim, Sang-Wook Kim, Sunghoon Center for Brain Busan 21 Plus Program Department of Applied Chemistry Dong-Eui University Busan47227 Korea Republic of Department of Electronic Materials Engineering Kwangwoon University Seoul01897 Korea Republic of Department of Molecular Science and Technology Ajou University Suwon16499 Korea Republic of

Automotive taillights play crucial roles in providing essential signals about vehicle status, representing brand design identity, and contributing to aesthetic appeal. In this study, a host matrix-free quantum dot (QD)-deposited films for automotive taillight applications is developed using the aerosol-assisted deposition (AAD) method. Direct deposition of thin high-density red-emitting QD (RQD) layers (≈4.3 µm thick) onto blue mini-light-emitting diodes (LEDs) (mini-BLEDs) as light sources resulted in complete wavelength conversion with no blue light leakage. This approach addresses the limitations of conventional inorganic-phosphor-based LEDs by achieving high color purity, uniform surface emission, and enhanced luminous efficiency. RQD-deposited films embedded with spherical silica particles as scattering agents demonstrated a luminous efficiency of 32.9 lm W⁻¹. The AAD method enabled large-area patterned deposition with exceptional uniformity, as confirmed by color coordinate variations of less than 0.003 across a 10 cm × 10 cm film. A fabricated taillight prototype exhibited vivid red emission and high visibility. These findings demonstrate the potential of the QD-BLED technology as a next-generation lighting solution for automotive applications, offering a balance between technical performance and design flexibility. © 2025 Wiley-VCH GmbH.

关键词： Luminescent devices

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Studies on Crystal Transition of Polyamide 11 Nanocomposites by Variable-temperature X-Ray Diffraction

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Chinese Journal of Polymer science 2014年第1期32卷 115-122页

作者：刘天西 Dan Chen In Yee Phang 韦春 Key Laboratory of New Processing Technology for Nonferrous Metals and Materials Ministry of Education College of Materials Science and Engineering Guilin University of Technology State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Institute of Materials Research and Engineering A*STAR (Agency for Science Technology and Research)

Polyamide I1 （PAll） and its nanocomposites with different organoclay loadings were prepared by melt-compounding and subsequent pelletizing. The crystal phase transitions of PAl 1 and its clay nanocomposites were investigated by variable-temperature X-ray diffraction. It was found that the Brill transition of the nanocomposite was 20 K higher than that of the neat PAl 1 for both heating and cooling processes. The PAl 1 d-spacings of the nanocomposites were observed to be smaller than those of the neat PAl 1 for melt crystallization. The constraints imposed by the addition of layered clay, restricting the thermal expansion of the polymer chains, are probably responsible for such a reduction of the d-spacing.

关键词： Polyamide 11 Clay Nanocomposites Crystal transition Variable-temperature X-ray diffraction.

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Ultrathin and Stable Ionic Liquid Membranes with Bio-Inspired Interlocking Architecture for CO2 Separation

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Small 2025年 e2503418页

作者： Xue, Yu-Ren Xu, Guang-Chang Li, Kai Guo, Xin-Yu Wu, Jian Liang, Hong-Qing Yang, Hao-Cheng Zhang, Chao Xu, Zhi-Kang MOE Key Lab of Macromolecular Synthesis and Functionalization and Key Lab of Adsorption and Separation Materials & Technologies of Zhejiang Province Department of Polymer Science and Engineering Zhejiang University Hangzhou310058 China The "Belt and Road" Sino-Portugal Joint Lab on Advanced Materials International Research Center for X Polymers Zhejiang University Hangzhou310058 China Department of Chemistry Zhejiang University Hangzhou310058 China

The growing demand for energy-efficient carbon capture has spurred significant advancements in supported ionic liquid membranes (SILMs), which utilize ionic liquid (IL) with high CO2 solubility for continuous gas purification processes. However, conventional SILMs are hindered by a persistent limitation: thick IL layers (> 50 µm) significantly reduce CO2 permeance to below 1 GPU, while also causing mechanical failure under prolonged operational pressure. Inspired by the interlocking elytra of Tenebrionidae beetles, which use microscale "teeth" to withstand mechanical stress, locked ionic liquid membranes (LILMs) are engineered by composeing two interpenetrating polyamide nanofilms with biomimetic protrusions. These nanofilms confine ILs within cavities formed by protrusions, thinning IL layers to sub-0.5 µm while resisting shear stresses. The LILMs demonstrate a CO2/N2 selectivity of 55 and an enhanced CO2 permeance of 8.2 GPU, surpassing the performance of conventional SILMs by ≈20-fold while maintaining stability over 168 h of continuous mixed gas separation. By dual-purposing ILs as both solvents for interfacial polymerization and CO2 transporters, this bio-inspired architecture overcomes the thickness-stability limitations, enabling energy-efficient carbon capture. © 2025 Wiley-VCH GmbH.

关键词： Gas fuel purification

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Polyacrylamide hydrogel containing rice husk ash as internal curing agent in mortar/concrete

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Journal of Molecular Liquids 2025年 423卷

作者： de Almeida, Edson Araujo Kruger, Fábio Rodrigo Valderrama, Patrícia da Silva Gonzalez, Regiane Muniz, Edvani Curti Chemistry Postgraduation Program Chemistry Department State University of Maringá – UEM Paraná Maringá87020-90 Brazil Civil Engineering Department Federal University of Technology – Paraná – UTFPR-CM Paraná Campo Mourão87301-899 Brazil Chemistry Department Federal University of Technology – Paraná – UTFPR-CM Paraná Campo Mourão87301-899 Brazil Food Postgraduation Program Federal University of Technology – Paraná – UTFPR-CM PR Campo Mourão87301-899 Brazil Materials Science and Engineering Postgraduation Program Federal University of Technology – Paraná – UTFPR-LD PR Londrina86036-370 Brazil Chemistry Postgraduation Program Chemistry Department Federal University of Piauí – UFPI Piauí Teresina64049-550 Brazil

Internal curing is a process based on the addition of materials that work as water reservoirs in cementitious media. Their function is to minimize the effect of water lost through evaporation and self-desiccation that occurs during curing. Hydrogels are polymeric materials that have the ability of absorbing and retaining water and releasing it in a gradual and sustained way. In this work, polyacrylamide hydrogel containing rice husk ash (PAAm/RHA) was synthesised and applied in mortar and concrete formulations. The aim was to study the influence of this material on the hydration process and on the final properties of such cementitious materials. The results indicated that the addition of as prepared composite hydrogel improved the mechanical strength and reduced shrinkage in the mortar in 23%;however, its application in concrete led to a reduction of 7.1% in the mechanical strength. Despite this, it can be postulated that the developed hydrogel acts satisfactorily for internal curing in cementitious materials. To the best of our knowledge, it is the first time that hydrogel formulation uses rice husk ash (RHA) and crosslinked polyacrylamide to be used as curing agent for mortars and concrete. Beyond the technological use of composite hydrogel as curing agent, the methodology is also interesting because rice husk ash, as by-product from rice agro-industries, was used. So, it should be seen also as a contribution for environment. © 2025 Elsevier B.V.

关键词： Mortar

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Design and applications of lattice plasmon resonances

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Nano Research 2018年第9期11卷 4423-4440页

作者： Bharath Bangalore Rajeeva Linhan Lin Yuebing Zheng Materials Science and Engineering Program Department of Mechanical Engineering The University of Texas at Austin Austin Texas78712 USA

With their unique optical properties associated with the excitation of surface plasmons, metal nanoparticles （NPs） have been used in optical sensors and devices. The organization of these NPs into arrays can induce coupling effects to engineer new optical responses. In particular, lattice plasmon resonances （LPRs）, which arise from coherent interactions and coupling among NPs in periodic arrays, have shown great promise for realizing narrow linewidths, angle-dependent dispersions, and high wavelength tunability of optical spectra. By engineering the materials, shapes, sizes, and spatial arrangements of NPs within arrays, one can tune the LPR-based spectral responses and electromagnetic field distributions to deliver a multitude of improvements, including a high figure-of-merit, superior light-matter interaction, and multiband operation. In this review, we discuss recent progress in designing and applying new metal nanostructures for LPR-based applications. We conclude this review with our perspective on the future opportunities and challenges of LPR-based devices.

关键词： plasmonics,lattice plasmon resonance,nanoparticle array coupling,sensors

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Study of doxorubicin release carried out by pH-responsive chitosan-alginate hydrogels

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Journal of Molecular Liquids 2025年 429卷

作者： Oliveira, Thayane Portela da Silva, Jhaemely Gabrielly Vieira Costa, Paloma Maia de Oliveira, Maykol Christian Damasceno Coelho, Ronaldo Cunha Santos Nascimento, Ariane Maria Silva Silva-Filho, Edson Cavalcanti dos Santos, Francisco Eroni Paz Muniz, Edvani Curti Postgraduate Program in Engineering and Materials Science Federal University of Piauí PI Teresina64049550 Brazil Physics Department Federal University of Piauí PI Teresina64049550 Brazil Department of Teacher Training Instituto Federal do Piauí PI Teresina64053-390 Brazil Chemistry Department Federal University of Piauí PI Teresina64049550 Brazil Chemistry Department State University of Maringá PR Maringá87020-900 Brazil

The use of polysaccharides in drug delivery systems has attracted increasing interest due to their functional properties. Among these, alginate (ALG) and chitosan (CH) are promising candidates for sustained drug delivery as they respond to pH, ensuring that the compound is released in a desired area. In this research physical hydrogels based on alginate and chitosan (ALG/CH) were prepared by varying the synthesis parameters (ALG at ALG/CH ratio, pH and speed stirring) and the effects of such parameters on hydrogels’ chemical and physical structure were accessed through several techniques. Also, the effects synthesis parameters on fractional release (Fmax), half time (t1/2) and percentage encapsulation efficiency (EE%), as the evaluated responses, were statically measured using a factorial design. Analysis through Raman and FTIR spectroscopies revealed the modes and bands corresponding to the precursors, confirming the formation of physically cross-linked hydrogels. The porous structure of the materials was confirmed by scanning electron microscopy (SEM). The swelling capacities of the hydrogels were analyzed at different pHs (5.4 and 7.4) and demonstrated that absorption increases in slightly acidic media. TG/DTG and Micro-CT analyzes of the sample with the greatest swelling showed that the degradation of the hydrogel occurs in two endothermic events and that the material possesses several sized and interconnected pores. The doxorubicin (DOX) release study showed that the release rate is higher as the higher proportion of CH relative to ALG. The factorial design analysis indicated the statistically significant factors in the DOX release tests. Thus, the results suggest that ALG/CH hydrogels can be tuned during their preparation to achieve optimal structure for pH-responsive to be applied for DOX releasing system. © 2025 Elsevier B.V.

关键词： Microgels

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Effects of Chain Entanglement on Liquid-Liquid Phase Separation Behavior of LCST-type Polymer Blends: Cloud Point and Decomposition Rate

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Chinese Journal of Polymer science 2015年第6期33卷 869-879页

作者： Yu Lin 上官勇刚 Bi-wei Qiua Wen-wen Yu Feng Chen Zhen-wu Guo 郑强 MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University Shanghai Key Laboratory of Advanced Polymeric Materials School of Materials Science and EngineeringEast China University of Science and Technology College of Modern Science and Technology China Jiliang University

By preparing homogenous blend samples with different degrees of chain entanglement, we report an anomalous contribution of chain entanglement to phase separation temperature and rate of poly（methyl methacrylate）/poly（styrene-co- maleic anhydride）（PMMA/SMA） blends presenting a typical lower critical solution temperature （LCST） behavior. The melt- mixed PMMA/SMA blends with a higher chain entanglement density present a lower cloud point （To） and shorter delay time, but lower phase separation rate at the given temperature than solution-cast ones, suggesting that for the polymer blends with different condensed state structure, thermodynamically more facilitation to phase separation （lower Tc） is not necessarily equivalent to faster kinetics （decomposition rate）. The experimental results indicate that the lower Tc of melt-mixed sample is ascribed to smaller concentration fluctuation wavelength （Am） induced by higher entanglement degree, while higher entanglement degree in melt-mixed sample leads to a confined segmental dynamics and consequently a slower kinetics （decomposition rate） dominated by macromolecular diffusion at a comparable quench depth. These results reveal that the chain packing in polymer blends can remarkably influence the liquid-liquid phase separation behavior, which is a significant difference from decomposition of small molecular mixtures.

关键词： Chain entanglement Spinodal decomposition Concentration fluctuation Segmental dynamics.

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Poly(vinylidene fluoride)Separators with Dual-asymmetric Structure for High-performance Lithium Ion Batteries

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Chinese Journal of Polymer science 2016年第12期34卷 1423-1435页

作者： Hong-qing Liang Ling-shu Wan 徐志康 MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province Department of Polymer Science and Engineering Zhejiang University

Dual-asymmetric poly（vinylidene fluoride）（PVDF） separators have been fabricated by thermally induced phase separation with dimethyl sulfone （DMSO2） and glycerol as mixed diluents. The separators have a porous bulk with large interconnected pores （-1.0 μm） and two surfaces with small pores （-30 nm）. This dual-asymmetric porous structure endows the separators with higher electrolyte uptake amount and rapider uptake rate, as well as better electrolyte retention ability than the commercialized Celgard 2400. The separators even maintain their dimensional stability up to 160 ℃, at which temperature the surface pores close up, leading to a dramatic decrease of air permeability. The electrolyte filled separators also show high ion conductivity （1.72 ***-1） at room temperature. Lithium iron phosphate （LiFePO4）/lithium （Li） cells using these separators display superior discharge capacity and better rate performance as compared with those from the commercialized ones. The results provide new insight into the design and development of separators for high-performance lithium ion batteries with enhanced safety.

关键词： Polymer separator Lithium ion battery Dual-asymmetric structure Porous membrane Thermally induced phaseseparation.

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Conjugated microporous polymers with distinctive π-electronic properties exhibiting enhanced optical applications

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Chinese Chemical Letters 2016年第8期27卷 1405-1411,1470页

作者： Jing Tan Wu-Ji Chen Jia Guo State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science and Lab of Advanced MaterialsFudan University

The short review discusses a family of amorphous porous organic polymers,conjugated microporous polymer（CMP）,which is distinctive in fusion of a large π-electronic conjugation within the topological network *** kind of polymers has shown the synthetic variety,the advanced capability and the wide applicability in contrast to the reported ***,the significant progress of CMP applications has been summarized to showcase their capability in constructing photo-functional systems.

关键词： Conjugated polymers Porous materials Light harvesting Photocatalysis Optoelectronics Chemosensor Phototherapy

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Emulating complex synapses using interlinked proton conductors

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Physical Review Applied 2025年第1期23卷 014027-014027页

作者： Lifu Zhang Ji-An Li Yang Hu Jie Jiang Rongjie Lai Marcus K. Benna Jian Shi Department of Materials Science and Engineering Rensselaer Polytechnic Institute Troy New York 12180 USA Neurosciences Graduate Program University of California San Diego La Jolla California 92093 USA Department of Mathematics Purdue University West Lafayette Indiana 47907 USA Department of Neurobiology School of Biological Sciences University of California at San Diego La Jolla California 92093 USA Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute Troy New York 12180 USA

In terms of energy efficiency and computational speed, neuromorphic electronics based on nonvolatile memory devices are expected to be one of most promising hardware candidates for future artificial intelligence (AI). However, catastrophic forgetting, networks rapidly overwriting previously learned weights when learning new tasks, remains a pivotal obstacle in either digital or analog AI chips for unleashing the true power of brainlike computing. To address catastrophic forgetting in the context of online memory storage, a complex synapse model (the Benna-Fusi model) was proposed recently [M. K. Benna and S. Fusi, Nat. Neurosci. 19, 1697 (2016)], the synaptic weight and internal variables of which evolve following diffusion dynamics. In this work, by designing a proton transistor with a series of charge-diffusion-controlled storage components, we have experimentally realized the Benna-Fusi artificial complex synapse. Memory consolidation from coupled storage components is revealed by both numerical simulations and experimental observations. Different memory timescales for the complex synapse are engineered by the diffusion length of charge carriers and the capacity and number of coupled storage components. The advantages of the demonstrated complex synapse for both memory capacity and memory consolidation are revealed by neural network simulations of face-familiarity detection. Our experimental realization of the complex synapse suggests a promising approach to enhance memory capacity and to enable continual learning.

关键词： Nonvolatile storage

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