查找使用阿拉丁产品的科研文献

Amide-based bio-derived flame retardant enhances the fire retardancy, toughness, and UV-aging resistance of polylactic acid

Wenjie Yang,Zhendong Li,Qian Chen,Shengtao Zhang,Shouhu Xuan,Anthony Chun Yin Yuen,Wei Yang

Polylactic acid (PLA) suffers from inherent brittleness, flammability, and poor UV resistance, which significantly limit its practical applications. Conventional additives often exhibit single functionality and tend to reduce the crystallinity of polymers, leading to a deterioration in mechanical properties. In this study, a multifunctional bio-based additive (HVB) was synthesized by introducing amide groups into vanillin-modified hexachlorocyclotriphosphazene. The molecular interactions formed between the amide groups in HVB and PLA further promoted the enhancement of PLA crystallinity. Consequently, both the tensile strength and elongation at break of PLA were remarkably improved. When the HVB loading was 3 wt%, the composite exhibited a 3.4% increase in tensile strength and a 75.8% improvement in elongation at break, while achieving a UL-94 V-0 flame-retardant rating. Furthermore, molecular simulations combined with experimental characterizations were employed to elucidate the carbonization and free-radical-trapping mechanisms of the flame retardant.

Synthesis and performance of a new UV-curable non-isocyanate polyurethane coating derived from CO2-based polycarbonate macrodiol

Xueying Wang,Sheng Huang,Shuanjin Wang,Lehui Hu,Liang Wang,Dongmei Han,Min Xiao,Yuezhong Meng

A series of CO 2 -based polycarbonate methacrylates (PPC(P)MAs) were synthesized in one step from CO 2 -based polycarbonate macrodiols (PPC(P)DLs) and methacrylic anhydride. These PPC(P)MAs were formulated with hydroxy urethane methacrylate (HUMA) prepolymer, reactive diluent and photoinitiator to produce a series of CO 2 -based non-isocyanate polyurethane (NIPU) UV-curable coatings. The resulting coatings exhibited excellent curing performance, with gel contents exceeding 94%, and 5% mass loss thermal decomposition temperature up to 286℃. When applied to polycarbonate (PC) substrates, all coatings displayed outstanding luminous transmittance (∼90%), adhesion (5B) and flexibility (1 mm). Notably, the coating prepared from PPCPMA achieved a pencil hardness of 4H. Furthermore, formulations incorporating TMPTA showed remarkable long-term water resistance, maintaining their appearance and adhesion unchanged after immersion in 60℃ water for ten days. This work provides not only a high-performance protective solution for PC-based components but also a viable green synthesis route for sustainable coatings.

UV-assisted Ga/In-doped ZnO coating to accelerate polydopamine deposition for surface modification of biodegradable zinc substrate

Yongmei Li,Chang Baocheng,Yuemei Li

Biodegradable zinc alloys have emerged as promising materials for cardiovascular implant applications. However, the practical application of biodegradable zinc alloys is restricted by several key challenges, including uncontrolled corrosion, inadequate endothelialization and reperfusion ischemia‑induced neointimal hyperplasia. Herein, UV‑assisted Ga‑doped ZnO (UV/GZO) and In‑doped ZnO (UV/IZO) layers are deposited on pure Zn substrates. These coatings can regulate Zn 2 + release and promote the growth of vascular endothelial cells. Under 325 nm excitation, electron‑hole pairs are generated in GZO and IZO via band‑to‑band transitions. The resulting photo‑induced energy catalyzes H 2 O and O 2 to produce reactive oxygen species (ROS), which act as chemical linking groups that accelerate polydopamine (PDA) deposition. The PDA coating enhances corrosion resistance and serves as an adhesion‑promoting interlayer. An outer PLGA layer forms robust bonds with the UV/GZO(IZO)/PDA‑modified Zn substrate, establishing a “sandwich protection system”. This system significantly improves adhesion force, corrosion resistance and mechanical stability. Moreover, the Zn/UVGZO/PDA/PLGA and Zn/UVIZO/PDA/PLGA coatings exhibit good antibacterial activity and controlled degradation, which prevents direct contact between endothelial cells and the Zn surface and decreases adverse cellular responses.

A Novel Approach for the Fabrication of Polarization-Selectivity UV Photosynapse Devices With PdSe2/ a-plane GaN Heterostructures

Tingting Lin,Liwei Liu,Xinguo Liu,Changjian Zhou,Wenliang Wang

High polarization-selectivity UV photodetectors with multifunctional integration play a crucial role in the next-generation optoelectronic devices. However, weak and unruly dichroism radio (DR) of naturally anisotropic materials seriously restricts the detection accuracy and practical application, especially for wide-bandgap materials with rough surfaces and inherent weak anisotropy. In this work, a novel approach for the polarization-selectivity UV photosynapse devices with PdSe 2 / a -plane GaN heterostructures has been proposed. A simple pre-selenization treatment is employed to enhance the anisotropy (DR = 16) and crystallinity of PdSe 2 , addressing the current limitation of insufficient anisotropy (DR<5) that hinders the practical application. The devices take advantage of inherent anisotropic materials and synergistic effect from the in situ growth of PdSe 2 on a -plane GaN, resulting in an enhancement of anisotropic photocurrent ratio from 1. 6 to 10.7. Thanks to the synergistic effect of the whole device architecture, the devices reveal an ultra-long relaxation time of up to 282s and effectively improve the details of image recognition, speed up calculations, and accurate detection capabilities. The combination of high polarization-selectivity, accurate detection, ultra-long memory, and outstanding data processing capabilities establishes the photodetector as a promising candidate for the on-chip integration of multi-information carrying, processing, and neuromorphic computing.

Pyroptosis- and Necroptosis-Related Signaling in Salicylate UV Absorber-Induced Toxicity: Implications for Sustainable Chemistry and Human Health

Chunlu He,Yan Wang,Jialiang Lin,Zihao Yu,Yuan Shi,Jianhua Cheng,Yunyun Jiang,Litao Hu

As emerging global environmental contaminants, organic ultraviolet absorbers (OUVAs) are widely used in personal care formulations and exhibit environmental persistence and potential bioaccumulation. Among these compounds, 2-ethylhexyl salicylate (EHS) and homosalate (HMS) are the most frequently used salicylate-type UV filters in cosmetic formulations. Although an increasing number of studies have demonstrated their environmental hazards, little is known about the molecular mechanisms underlying their cytotoxicity in mammalian systems, a fundamental knowledge gap for both human health protection and the development of more environmentally friendly consumer goods. In this study, we used mouse embryonic fibroblasts (MEFs, 3T6) and zebrafish as models to assess the toxicological phenotypes of EHS and HMS in vitro and in vivo, respectively. We found that both EHS and HMS induced cellular damage characterized by oxidative stress, disrupted intracellular calcium homeostasis, mitochondrial impairment, and DNA damage. Importantly, molecular analyses further suggested the concurrent activation of two distinct regulated cell death programs: pyroptosis, as suggested byCaspase-11-mediated GSDMD cleavage, and necroptosis, as suggested byZBP1-RIPK3-Caspase-8-mediated MLKL phosphorylation. The in vitro data have been partially validated at the level of gene expression and in developmental toxicity in the zebrafish model, providing some in vivo phenotypic and molecular correlates. While the upstream events were experimentally verified, the causal links among them remain to be further elucidated. Taken together, this work suggested that OUVA-induced toxicity is not limited to isolated oxidative damage, but may also involve the activation of two different cell death programs. These findings provide important molecular clues to understanding the potential health and ecological risks of widely used UV filters and offer a scientific basis for their more environmentally friendly safety evaluation and regulatory management, which are crucial for advancing more sustainable chemistry and safer consumer goods.

Castor Oil-Based UV Curable Polyurethane Acrylate: Solvent-Free Processing, Self-Healing, Controlled Degradation for Flexible Wearable Electronics

Su Huibin,Duan Tingxuan,Wang Tianyu,Chen Ying,Tian Xin,Zhang Xiaoyang,Guo Hongli,Kou Xuhan,Gao Yiyan,Gao Guanghui

Biobased polyurethane acrylate has broad application prospects in the field of wearable electronics due to its designable molecular structure, low cost and excellent sustainable properties. However, traditional plant oil-based polymers generally have disadvantages such as insufficient self-healing efficiency, insulation and nonconductivity, poor mechanical properties, and a tendency to cause electronic waste pollution, which limit their practical application. Here, we designed a simple, efficient and green preparation strategy, using a compound system of renewable castor oil (CO) and polycaprolactone diol (PCL) as a biodegradable soft segment, addressing the issue of poor processability caused by the high viscosity of castor oil while enhancing the material’s flexibility. Based on the dynamic cross-linked network constructed by intermolecular hydrogen bonds and reversible disulfide bonds, the prepared BPUA-4 exhibited high strength (11.04 MPa) and elongation at break (294%). Furthermore, through ionic liquid functionalization modification, this material exhibits excellent scratch self-healing efficiency (>83% at 80 ° C for 48 h). Thanks to the dense cross-linked structure formed by ultraviolet curing and the protection of hard chain segments, the ester bonds of this material will only undergo significant degradation in a strongly alkaline environment with pH = 14 or under the action of lipase CALB, and the mass loss rate after 30 days can exceed 30%. The sensor devices constructed based on this composite material can accurately detect various human movement signals and show good application potential in the fields of health monitoring and smart wearable devices.

Protective and Reparative Effects of Naematelia aurantialba Ethanol Extract Against UV-Induced Skin Photoaging and Its Underlying Mechanisms

Guanjie Peng,Bowen Sun,Sihui Chen,Lanyue Zhang,Yiyan Zeng,Zhenhai Huang,Qingqing Liu

Collaboration of Two UV-Absorbing Dyes in Cholesteric Liquid Crystals Films for Infrared Broadband Reflection and Ultraviolet Shielding

Mengqi Xie,Yutong Liu,Xiaohui Zhao,Zhidong Liu,Jinghao Zhang,Dengyue Zuo,Guang Cui,Hui Cao,Maoyuan Li

This study developed cholesteric liquid crystal broadband reflective films using zinc oxide nanoparticles (ZnO NPs) and homotriazine UV-absorbing dye (UV-1577) to enhance infrared shielding. Unlike benzotriazole-based UV absorber UV-327, which suffers from volatility and contamination, UV-1577 exhibits superior compatibility with liquid crystals, higher UV absorption efficiency, and enhanced processing stability due to its larger molecular structure. By synergizing UV-1577 with ZnO NPs, we achieved a gradient UV intensity distribution across the film thickness, inducing a pitch gradient that broadened the reflection bandwidth to 915 nm and surpassing the performance of previous systems using UV-327/ZnO NPs (<900 nm). We conducted a detailed examination of the factors influencing the reflective bandwidth. These included the UV-1577/ZnO NP ratio, the concentrations of the polymerizable monomer (RM257) and chiral dopant (R5011), along with polymerization temperature, UV irradiation intensity, and irradiation time. The resultant films demonstrated efficient ultraviolet shielding via the UV-1577/ZnO NPs collaboration and infrared shielding through the induced pitch gradient. This work presents a scalable strategy for energy-saving smart windows.

Application of hydrogels based on carbon dots and rare earths in dual-wavelength UV excitation adjustable multicolor fluorescence

Jiajia Du,Daohai Zhang,Kunlan Diao,Dongju Liu,Yupeng Hu,Zhi Lei,Jun Tong,Zhongli Wu

This study presents a multifunctional hydrogel engineered by integrating carbon dots (CDots) and lanthanide metal ions (Ln3+), which exhibits tunable multicolor fluorescence under dual-wavelength UV excitation (254 nm and 365 nm). Systematic characterization via scanning electron microscopy (SEM), mechanical analysis, and fluorescence spectroscopy revealed three key features: distinct chromatic transitions between excitation wavelengths, favorable mechanical robustness, and long-term stability. The programmable fluorescence behavior, achieved through precise Ln3+ stoichiometric control and CDot-mediated energy transfer mechanisms, enables optical encryption with dual-excitation modes. Furthermore, the hydrogel demonstrates visual ion detection capabilities, exhibiting rapid fluorescence responses toward Zn2+ and K+ via specific coordination interactions. This dual-functional hydrogel advances the development of intelligent materials for anti-counterfeiting technologies and environmental monitoring applications.

One-step synthesized cottonseed hull-derived magnetic biochar for efficient extraction and determination of benzotriazole-based UV stabilizers

Bowen Deng,Dan Fang,Yuyang Wang,Mengyuan Lv,Jinqing You,Shuangjiao Xu,Lei Ma,Di Chen

In this study, a novel magnetic biochar (Fe₃O₄/CHBB) derived from cottonseed hulls was synthesized via a simple one-step pyrolysis method and applied as a magnetic solid-phase extraction (MSPE) sorbent for the efficient enrichment and determination of Benzotriazole-based Ultraviolet Stabilizers (BUVSs). The synthesis conditions, including FeCl₃·6H₂O concentration and pyrolysis temperature, were systematically optimized to enhance the material's adsorption performance. Comprehensive characterization using SEM, XPS, FT-IR, BET, and VSM revealed that the optimized Fe₃O₄/CHBB exhibited favorable magnetic properties, abundant surface functional groups, and a porous structure suitable for BUVS adsorption. The MSPE procedure was further optimized in terms of sample pH, sorbent dosage, extraction/desorption time, and solvent type and volume. Under optimal conditions, the method showed good linearity (R² ≥ 0.9939), low limits of detection (6.6–14.1 ng/mL), and satisfactory precision (intra-day RSDs: 0.98–8.36 %; inter-day RSDs: 2.45–13.26 %). Application to commercial beverage and herbal samples demonstrated the method's practical applicability, although no BUVSs were detected above the method’s LOD. Overall, the proposed Fe₃O₄/CHBB-MSPE method is simple and cost-effective, offering a promising analytical platform for trace-level detection of BUVSs in complex aqueous environments while promoting the sustainable utilization of agricultural waste.

Polymer-specific transformation of microplastics under soil freeze–thaw versus UV aging: Multiscale insights into atrazine interaction mechanisms

Jian-yong Wu,Jun-min Gao,Wen-hao Yang,Yi-dan Xu,Kong-yan Luo,Jiong Wen,Jie Zeng,Jin-song Guo

Microplastics (MPs) and herbicides like atrazine (ATZ) are widely detected in cold-region agricultural soils, raising environmental concerns. However, the effects of freeze–thaw cycles (FTCs), a typical climatic stress, on the modification of the surface properties of MPs and the subsequent interactions between FTC-aged (FT-) MPs and coexisting ATZ remain unclear. Here, Polystyrene (PS) and polyethylene (PE) MPs prevalent in cold regions were aged via soil FTCs, with UV aging as a reference, to assess physicochemical alterations and ATZ interactions using experiments and simulations. FT-PS exhibited marked surface oxidation (O/C ratio increased 3.2-fold) and structural degradation (specific surface area increased 1.8-fold), resulting in the highest ATZ adsorption capacity (441.920 μg/g), which was 120 % and 109 % greater than that of unaged and UV-aged PS, respectively. In contrast, PE exhibited minimal physicochemical changes under either aging condition, and its adsorption was mainly governed by hydrophobic interactions. Density functional theory and molecular dynamics simulations revealed that FTCs introduced oxygen-containing groups and surface defects on PS, promoting hydrogen bonding and stronger van der Waals interactions with ATZ. These results highlight the overlooked role of FTCs in shaping MP–pollutant interactions and call for greater attention to co-contamination risks in the agricultural ecosystems of cold regions.

Fabrication of multifunctional lignin-based composite coatings for enhanced strength, barrier properties and UV protection of cellulosic paper

Kaifan Xie,Tong Luo,Lexiang Wang,Junming Wang,Wei Liu,Yanjun Tang

The ultraviolet (UV) shielding properties of food packaging materials have garnered significant attention for mitigating issues such as off-flavors, discoloration, and nutrient degradation. However, achieving effective UV protection while maintaining sustainability and performance in packaging materials remains a challenge. Herein, a novel multifunctional composite coating with UV-shielding properties was prepared using cellulose nanocrystals (CNCs) and sodium lignosulfonate (SL) as functional components and polyvinyl alcohol (PVA) as a cross-linking agent. Notably, the SL-4/C/P coated paper prepared using the coating with an SL/CNCs mass ratio of 4:1, exhibited excellent UV-shielding efficiencies (98 % shielding in the UVA region and almost completely block the whole UVB region), enhanced mechanical properties (126 % increase in tensile index and 308 % improvement in folding endurance), lower Cobb 30 value (decreased from 66 g/m 2 to 56 g/m 2 ), and reduced air permeability (decreased from 124 mm/s to 52 mm/s) compared to uncoated paper. This work offers a sustainable and promising strategy for balancing UV-shielding performance with the functional properties of food packaging paper, opening new avenues for the high-value application of CNCs and SL in the papermaking industry.