Materials
·
2025
·Vol. 18
·期 2
·331
·
IF 3.2
Chang-Ying Sun,Wei Liu,Xin Shi,Guang-Hui Rao,Jing-Tai Zhao
Mechanoluminescent (ML) materials emit light by trapping and releasing charge carriers under mechanical stress. However, previous studies do not fully reveal the relationship between emitting light intensity and mechanical stress, thereby affecting the accuracy of stress measurement. This study addresses this gap by systematically investigating ML cylinders with various sizes and loading paths using theoretical analysis and simulations, focusing on the maximum contact stress, equivalent stress distribution, and the relationship between the strain energy density and light intensity at the point of maximum contact stress. In combination with experiments, the mechanical behavior and optical responses of ML cylinders under normal compressive forces reveal that the luminescence intensity is closely related to cylinder size and loading path, effectively reflecting stress distributions in objects of different sizes under complex stress conditions. Particularly, within the elastic range and under ideal conditions where lateral stress is ignored, the maximum contact stress is nearly equal to the equivalent stress. The equivalent stress is linearly related to the light intensity, while the strain energy density at the maximum contact stress point is proportional to the square root of the light intensity. This work promotes the application of ML materials in structural health monitoring and stress visualization.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Soft Matter
·
2018
·Vol. 14
·期 22
·4558-4568
·
IF 3.709
Ruiqing Wu,Jingjuan Lai,Yi Pan,Zhaohui Zheng,Xiaobin Ding
To enable shape-memory polymer networks to achieve recoverable high deformability with a simultaneous high shape-fixity ratio and shape-recovery ratio, novel semi-crystalline slide-ring shape-memory polycaprolactone-based polyurethane (SR-SMPCLU) with movable net-points constructed by a topologically interlocked slide-ring structure was designed and fabricated. The SR-SMPCLU not only exhibited good shape fixity, almost complete shape recovery, and a fast shape-recovery speed, it also showed an outstanding recoverable high-strain capacity with 95.83% Rr under a deformation strain of 1410% due to the pulley effect of the topological slide-ring structure. Furthermore, the SR-SMPCLU system maintained excellent shape-memory performance with increasing the training cycle numbers at 45% and even 280% deformation strain. The effects of the slide-ring cross-linker content, deformation strain, and successive shape-memory cycles on the shape-memory performance were investigated. A possible mechanism for the shape-memory effect of the SR-SMPCLU system is proposed.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Qinghua Feng,Panpan Lin,Tiesong Lin,Peng He,Yan Liu,Weimin Long,Jian Li
A novel design of a multi-layered joint architecture, characterized by the controllable spatial distribution of ceramic reinforcements, was obtained, when brazing ZrB 2 -SiC ceramics and Ti-6Al-4 V reinforced by TiB whiskers with AgCu filler. To induce SiC reinforcements to cluster together, within the center of the filler and especially away from the ZrB 2 -SiC, SiC was added into joint, in the form of a SiC interlayer featuring a 3D-bridged network structure with continuous micro-channels infiltrated by capillary force by liquid filler during brazing. Different SiC particles were connected together, by micro-bridges being not destroyed during brazing. The layer rich in SiC could reduce thermal expansion mismatch between different substrates, the AgCu next to the ZrB 2 -SiC could relax the strain energy by high plastic deformation. Compared to joint brazed with single AgCu, joint strain energy decreased from 10.8 × 10 −6 J to 8.6 × 10 −6 J, accordingly joint shear strength increased from ∼5.4 MPa to ∼41.2 MPa.
研究领域:
材料科学
·
焊接工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Kaiyuan Qi,Siling Liu,Xiao Lan,Caihong Wang,Shuai Tan,Yong Wu
Piezo-supercapacitors have been developed to collect human motion energy but tensile strain energy harvesting through piezo-supercapacitor is little explored. In this work, a stretchable piezo-supercapacitor SSP PPy-BTO is constructed from hydrogel piezo-electrolyte HPE SA-BTO and polypyrrole elastomer electrode for self-charging by tensile deformation. HPE SA-BTO is fabricated by in situ polymerization of acrylamide in aqueous sulfuric acid solution containing uniformly dispersed barium titanate particles. HPE SA-BTO delivers an ionic conductivity of 97.3 mS cm −1 and an open circuit voltage of 2619 mV under a compressive force of 3.5 N. Sandwiching HPE SA-BTO between elastic poly (2-hydroxy ethyl acrylate)- co -polypyrrole electrodes gives SSP PPy-BTO , which exhibits a stretchability of 286 % and a specific capacitance of 218 mF cm −2 . SSP PPy-BTO successfully harvests energy from axial stretch to charge itself in the lateral direction through transverse deformation of HPE SA-BTO . The self-charged voltage increases with the increase in tensile strain and attains 567 mV at 60 % strain. A single SSP PPy-BTO with an effective area of 2 cm 2 is self-charged by the energy from flexing a finger and properly powers an electronic watch. The work offers insights into the tensile strain energy harvesting and is helpful for proper design of stretchable piezo-supercapacitors.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Bing Liu,Haiming Li,Zihao Song,Hongyan Li,Jingguo Liu,Dongqing Wei,Xiaolan Liao,Huan Li
Although SiO 2 aerogels have broad application prospects in the field of thermal insulation coatings, their fragile structure is easily collapsed and damaged due to capillary forces during preparation and coating processes. While surface hydrophobic treatment can alleviate this damage to some extent, it simultaneously reduces the compatibility of the aerogel with the coating matrix, hindering its uniform dispersion in the system, thus creating a contradiction. Here, we introduced wrinkled-porous core-shell SiO 2 aerogel fiber composites (WP-PLA/CA-SiO 2 ), fabricated via electrospinning using polylactic acid (PLA) and cellulose acetate (CA) as shell materials and SiO 2 sol as the core precursor. Thermal insulation coatings were prepared based on these fibers. The robust outer shell of the fibers effectively protected the internal aerogel from damage caused by capillary forces during the preparation and application of coatings. Crucially, the surface pores on the shell served as unidirectional channels, facilitating the release of internal gases during the drying process while effectively preventing the entry of external moisture. Simultaneously, the wrinkled fiber morphology functioned as a strain energy storage device, offsetting internal drying stress by releasing the stored strain. This synergistic triple-action mechanism ensured that the aerogel fibers maintained excellent structural integrity and were relatively uniformly dispersed within the coating matrix. As a result, the coating exhibited superior thermal insulation performance (with a maximum surface temperature of only ∼45 °C after 60 min of heating) and excellent storage stability (>6 months). This work provides a transformative strategy to overcome the key obstacles hindering the application of aerogels in the coatings field.
研究领域:
材料科学
·
高分子科学
·
纳米科技
·
表面与界面化学
·
功能涂层
·
热管理材料
✓ 已验证
DOI
高影响因子
MACROMOLECULES
·
2025
·
IF 5.2
Yiting Liu,Rui Chen,Yuan Jiang,Xian Zhang,Yu Shen,Sichao Huang,Hongxiang Li,Zhongxiang Peng,Qiang Zhang,Zicheng Ding,Xiaozheng Duan,Yanchun Han
Chemical doping has emerged as a promising strategy for fabricating high-performance stretchable conjugated polymer films. However, the underlying working mechanisms remain poorly understood. Herein, by a combination of theory simulation and structural characterization, we demonstrate that the spatial distribution of chemical dopants in conjugated polymer films is critical for simultaneously enhancing the carrier mobility and stretchability of the films. Using the conjugated polymer poly(indacenodithiophene-co-benzothiadiazole) (IDTBT) and the dopant tris(4-bromophenyl) ammoniumyl hexachloroantimonate (Magic Blue, MB) as a model, we demonstrate that the intimate contact between MB and the IDTBT backbone promotes the efficient charge transfer via cation-π interactions. It not only induces a more planarized backbone with enhanced charge delocalization but also introduces structural disorder with enlarged π–π stacking distance. The former improves intrachain charge transport and reduces contact resistance in transistor devices, whereas the latter enables effective strain energy dissipation through chain sliding and alignment during stretching. Consequently, the IDTBT film exhibits ca. a 2-fold increase in both carrier mobility and fracture strain through chemical doping. Moreover, the doped film maintains a high mobility of 1.85 cm2 V–1 s–1 at 100% strain, significantly outperforming the pristine film (ca. 0.18 cm2 V–1 s–1 at 100% strain). This work provides a guideline for the chemical doping regulation to construct high-performance stretchable conjugated polymer films.
研究领域:
材料科学
·
高分子化学
·
电子器件
·
纳米技术
·
固体物理
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 19
·2759
·
IF 4.7
Jianing Wei,Jia Yan,Shichao Li,Juanzi Li,Zhanjun Wu
A liquid oxygen-compatible epoxy resin of fluorinated glycidyl amine (TFEPA) with a low viscosity of 260 mPa·s in a wide range of temperatures, from room temperature to 150 °C, was synthesized and used to decrease the viscosity of phosphorus-containing bisphenol F epoxy resins. And the forming process and application performances of this resin system and its composite were investigated. The viscosity of the bisphenol F resin was decreased from 4925 to 749 mPa·s at 45 °C by mixing with 10 wt.% TFEPA, which was enough for the filament winding process. Moreover, the processing temperature and time windows were increased by 73% and 186%, respectively. After crosslinking, the liquid oxygen compatibility was preserved, and its tensile strength, elastic modulus, and breaking elongation at −196 °C were 133.31 MPa, 6.59 GPa, and 2.36%, respectively, which were similar to those without TFEPA. And the flexural strength and modulus were 276.14 MPa and 7.29 GPa, respectively, increasing by 21.73% in strain energy at flexural breaking, indicating an enhanced toughness derived from TFEPA. Based on this resin system, the flexural strength and toughness of its composite at −196 °C were 862.73 MPa and 6.88 MJ/m3, respectively, increasing by 4.46% and 10.79%, respectively.
研究领域:
材料科学
·
化学工程
·
高分子科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Huan Chen,Caijun Zou,Daguang Li,Dan Zhao,Xuesong Zhai
Lanthanide-doped sodium rare-earth tetrafluoride (NaREF 4 :Ln) nanocrystals with small sizes (below 20 nm) have shown great potential in biomedical applications, but their low luminescence efficiency has limited practical use. Here, we report the synthesis and characterization of small-sized α-NaYF 4 /transition interface layers (TIL)/β-NaLuF 4 :Yb,Er slow-phase-transition nanoparticles (SPTNPs) using a combined cation exchange and epitaxial growth strategy. These SPTNPs feature a continuous lattice evolution from α-phase core to β-phase shell, enhancing upconversion luminescence (UCL) intensity by 23.57 times compared to traditional UCNPs, with violet emission enhanced by up to 70.7 times. The absolute quantum yields reached 2.36 % for SPTNPs and 3.44 % for SPTNPs with an inert shell. We verified that the phase transition was driven by strain energy accumulation within the TIL, and demonstrated that the crystallinity of the α-core significantly impacted the phase transition of the shell. Eu³ ⁺ ions were used as structural probes to investigate the lattice environment evolution during SPTNPs growth, and the intermixing between the core and shell of the SPTNPs was further quantified. This work provides new insights into designing rare-earth-doped nanomaterials for biomedical and sensing applications.
研究领域:
纳米材料
·
材料科学
·
发光材料
·
生物医学工程
·
无机化学
·
固体物理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）