ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Ying Yu,Quanqian Lyu,Xiujuan Zhang,Miaomiao Li,Meiru Zhao,Zhen Hu,Lianbin Zhang,Jintao Zhu
Assessment of the local strain/stress changes of adhesives is highly desirable for their service to avoid premature failure. However, monitoring local strain/stress variations in adhesives in practical settings remains challenging, especially in aqueous media. Here, an underwater structurally-colored adhesive for visualized local strain/stress monitoring in aqueous media is reported. The structurally-colored adhesive is obtained by shearing composites of poly(butyl acrylate- co -acrylic acid) copolymer and carboxylated polystyrene colloidal particles. The resultant structurally-colored adhesive exhibits underwater adhesive strength (i.e., 238 kPa for stainless steel substrates) to various substrates (e.g., metals and plastics) thanks to hydrophobic segments and carboxyl groups. Notably, they can shift color in response to external force, enabling real-time visual monitoring of localized strain/stress changes. As a proof of concept, the structurally-colored adhesive can be used to seal a leaking hole on a bottle or tube, and it can precisely visualize the localized pressure distribution, providing critical information on the adhesion performance and the local pressure. These distinctive properties make the structurally-colored adhesive suitable for application in wet environments as a real-time visual pressure tracking device.
研究领域:
材料科学
·
界面化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·
IF 29.4
Zhi Zhao,Junjie Liu,Mengfei Wu,Xuan Yao,Haibin Wang,Xuemei Liu,Zhibin He,Xiaoyan Song
Learning about the strain/stress distribution in a material is essential to achieve its mechanical stability and proper functionality. Conventional techniques such as universal testing machines only apply to static samples with standardized geometry in laboratory environment. Soft mechanical sensors based on stretchable conductors, carbon-filled composites, or conductive gels possess better adaptability, but still face challenges from complicated fabrication process, dependence on extra readout device, and limited strain/stress mapping ability. Inspired by the camouflage mechanism of cuttlefish and chameleons, here an innovative responsive hydrogel containing light-scattering “mechano-iridophores” is developed. Force induced reversible phase separation manipulates the dynamic generation of mechano-iridophores, serving as optical indicators of local deformation. Patch-shaped mechanical sensors made from the responsive hydrogel feature fast response time (<0.4 s), high spatial resolution (≈100 µm), and wide dynamic ranges (e.g., 10–150% strain). The intrinsic adhesiveness and self-healing material capability of sensing patches also ensure their excellent applicability and robustness. This combination of chemical and optical properties allows strain/stress distributions in target samples to be directly identified by naked eyes or smartphone apps, which is not yet achieved. The great advantages above are ideal for developing the next-generation mechanical sensors toward material studies, damage diagnosis, risk prediction, and smart devices.
研究领域:
材料科学
·
机械工程
·
光学
·
仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2022
·
IF 6.056
Tianfeng Han,Hui Xue,Xiaobo Hu,Ruiling Li,Huilan Liu,Yonggang Tu,Yan Zhao
In this paper, the effects of NaOH, NaCl, and heat on the appearance, physical characteristics, and gel structure of duck egg white (EW) jointly induced by NaOH, NaCl, and heat were investigated. Results showed that the absolute value of zeta potential (TAV-ZP) of gel samples increased, hunter whiteness decreased, gel opacity decreased, and the microstructure of gel appeared as a loose network structure with increased NaOH addition. With the increase of NaCl addition, TAV-ZP of gel samples decreased, hunter whiteness increased, gel opacity increased, the microstructure of gel became dense. With the increase of heating temperature, TAV-ZP of gel samples decreased, hunter whiteness decreased, gel opacity increased, the microstructure of gel became dense first and then loosened. The results of SDS-PAGE, surface hydrophobicity, T 2 , hardness, cohesiveness indicated that protein molecules underwent cross-linking, aggregation, and unfolding during duck EW gelation jointly induced by NaOH, NaCl, and heat. The results of strain-stress curve showed that all gel samples had a good anti-compressed ability. The results of central composite design showed that the best treatment of gel was heating temperature 91 °C, NaOH 0.48%, and NaCl 0.3%.
研究领域:
食品科学
·
化学
·
生物物理学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 33
·20081-20088
·
IF 3.361
Lechen Yang,Yan Wu,Feng Yang,Wenhao Wang
As a natural biological material, wood has renewability, biocompatibility, biodegradability and excellent mechanical properties. This research shows a conductive polymer composed of a cellulose-based flexible film constructed from natural wood and carbon nanotubes. Part of the lignin/hemicellulose of the natural wood was removed by the deep eutectic solvent to obtain a cellulose-based flexible film with a porous structure, and then the carbon nanotubes were infiltrated into the cellulose-based flexible film by vacuum pressure impregnation treatment to obtain the final conductive polymer. This conductive polymer has high conductivity and good toughness, and shows good perception ability under a certain range of strain/stress or human activity conditions. In addition, conductive fibers can be prepared by cutting and twisting the oriented cellulose nanofibers of this conductive polymer. The above-mentioned properties of this conductive polymer provide great potential for its development in electrical-related fields.
研究领域:
材料科学
·
纳米技术
·
电气工程
·
生物材料
·
可持续材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）