COLLOIDS AND SURFACES B-BIOINTERFACES
·
2021
·
IF 5.268
Jinling Liu,Jie Ai,Jiawen Chen,Ying Guo,Jianrong Lin,Qinhui Chen
The anisotropic Janus gel shows more diverse characteristic and responsiveness due to its asymmetric chemical structure. Herein, the water/oil PDA-PAA/PBMA-PEHMA Janus gel was prepared by one-step polymerization of incompatible monomers. In this Janus gel, PDA-PAA layer possesses good adhesion effect and self-healing property attributing to the chemical bonds and the hydrogen bonds among DA, AA, or each other, and the π-π stacking of DA. The IPN structure of the water phase and the oil phase makes Janus gel have good mechanical properties. The above chemical and physical effects dissipate a large amount of energy when PDA-PAA/PBMA-PEHMA Janus gel is subjected to external forces, so it has excellent fatigue resistance. The hydrophilic PDA-PAA side and the lipophilic PBMA-PEHMA side show different swelling responses in the oil-water medium. The internal stress difference caused by this different swelling makes the Janus gel show curl toward different directions in different media. Then, conductivity media of NaCl added in PDA-PAA layer endows Janus gel with anisotropic conductivity. It is possible to judge the hydrophilic and hydrophobic properties of solution by monitoring the current change of conductive Janus gel. Conductive Janus gel can also be used to monitor human body motion and micro motion. This conductive/insulating Janus gel is suitable for flexible sensor used in harsh environment.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Jiangkun Chen,Yang Guo,Bing Chen,Weilin Zheng,Xin Zhang,Xiaohe Wei,Yaxin Cao,Hao Suo,Feng Wang
Hydrochromic luminescent materials that are responsive to water or moisture have attracted considerable attention owing to their extensive use in sensing and information security. However, fine-tuning hydrochromic response to water content remains unfulfilled research, posing constraints in the widespread application of hydrochromic luminescence. This study reports a 0D Rb 3 TbF 6 perovskite with highly controllable hydrochromic characteristics. The Rb 3 TbF 6 crystals exhibit a distinct hydrochromic luminescence switching after B-site doping with Eu 3+ , stemming from Rb 3 TbF 6 to Rb 2 TbF 5 transformation that triggers intra-crystal Tb 3+ -to-Eu 3+ energy transfer. Through A-site alkaline metal alloying, the sensitivity of the perovskite to water stimuli is precisely tuned, rendering distinct responses over a wide range of humidity conditions (RH: 1–90% RH) and water levels (v/v: 0.5–55%). As an added benefit, the hydrochromic crystals also show excellent repeatability and photothermal stability. These advances on hydrochromic materials provide exciting opportunities in water detection, humidity sensing, and multi-level information encryption.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 42
·14826-14833
·
IF 7.059
Sijia Ren,Jiachun Feng
Water-responsive actuators have been of increasing interest in various applications. In this work, water-responsive actuators based on the bilayer composite film were prepared using commercialized PVA and SBS by a two-step solution casting method. In order to improve the adhesion between the PVA layer and SBS layer, SBS was firstly epoxidized to improve the polarity. Immediately after a thin film was formed on the surface of the epoxidized-SBS (E-SBS)/tetrahydrofuran solution, the PVA aqueous solution was poured onto the film and dried. It was found that the adhesive property between the two layers was improved and the adhesion strength reached 1005 kPa. The resultant bilayer film displayed the water-responsive two-way shape memory effect and exhibited excellent cyclic performance in five cycles. Flower-like and claw-like actuators based on the bilayer composite film were prepared and the actuation performance was demonstrated, suggesting their potential for applications in the fields of biomedicine and sensors.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Juping Liu,Huawei Zhang,Shijuan Zhang,Wenwen Wang,Jinmao You
A new three-dimensional(3D) covalent organic framework (COF) was designed and synthesized. It showed excellent fluorescence property and good fluorescence response for water. The fluorescence property decreased with the addition of water, and it showed good linearity in the water concentration range of 0.1–1.5 wt% with R 2 of 0.9988. The detection limit of water in acetonitrile was 0.036 wt%. It also showed good adsorption performance for polychlorinated biphenyls (PCBs), and the extraction performance of PCBs from water samples was evaluated GC–MS/MS. The optimized conditions were pH 7; adsorbent amount, 20 mg; eluent, 1.0 mL hexane; desorption time, 5 min. The obtained recoveries were in the range of 90.9%–101.3%. The limits of detection and limits of quantitation for PCBs were in the range of 0.56–2.81 ng/L and 2.0–8.7 ng/L, respectively. This is the first report of COFs which showed both excellent fluorescence and adsorption performance.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Smart Materials and Structures
·
2018
·Vol. 27
·期 4
·045010
·
IF 2.963
Yongkang Bai,Jiwen Zhang,Ran Tian,Xin Chen
In this work, a water-responsive shape memory ionomer with high toughness was fabricated by cross-linking hyaluronic acid sodium (HAS) and polyvinyl alcohol (PVA) through coordination interactions. The strong Fe3+-carboxyl (from HAS) coordination interactions served as main physical cross-linking points for the performance of water-responsive shape memory, which associated with the flexibility of PVA chain producing excellent mechanical properties of this ionomer. The optimized ionomer was not only able to recover to its original shape within just 22 s by exposing to water, but exhibited high tensile strength up to 35.4 MPa and 4 times higher tractility than the ionomer without PVA. Moreover, the ionomers can be repeatedly programed to various new permanent shapes on demand due to the reversible physical interactions, which still performed complete and fast geometric recovery under stimuli even after 4 cycles of reprograming with 3 different shapes. The excellent shape memory and strong mechanical behaviors make our ionomers significant and promising smart materials for variety of applications.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Changtong Zhou,Yong Qi,Shufen Zhang,Wenbin Niu,Suli Wu,Wei Ma,Bingtao Tang
The construction of novel photonic structures renders the possibility for creating stimuli-responsive functional materials. Herein, innovative water-response double-inverse opal (WRDIO) films with fast response time and brilliant structural color are first fabricated by introducing polystyrene microspheres into the inverse-opal backbone. The deprotonation of carboxyl groups generated by sodium carbonate treatment in the inverse-opal backbone inhibits the formation of hydrogen bonds among the polymer chains and the exposed carboxyl anions lead to hydrophilicity, which is conducive to the penetration of water into the internal pores. The response is achieved by inducing the polystyrene spheres within the pores from random distribution to the ordered assembly in the water environment, thus eliminating the scattering disturbance and developing bright structural color. Meanwhile, WRDIO film with a highly invisible pattern revealed by water stimuli is prepared. Furthermore, the content of carboxylic anions in the polymer affects the optical behavior and the increased osmotic pressure caused by high-proportioned carboxylic anions makes the WRDIO film swelled rapidly by water, whereas ethanol cannot. The broad-spectrum shifting (≈92 nm) depends on the composition of the ethanol-water mixture. Thus, the rapidly water-response and easy-to-use film materials with brilliant structural color exhibit potential applications in user-interactive anti-counterfeiting and sensors.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Advanced Healthcare Materials
·
2024
·
IF 10
Yating Xie,Lele Geng,Siyuan Ni,Wei Ni,Ruizhe He,Tiantian Liu,Gai Zhang,Tiger H. Tao,Keyin Liu,Yinbo Peng
Skin anti-aging treatments have become increasingly popular. Currently, the prevalent treatment method involves implanting skin tension regulation threads (skin lifting threads) under the skin, and radiofrequency treatments. In this study, inspired by the natural supercontraction of spider silk, the molecular structure of silk fibroin fibers is modulated into an oriented configuration. This modification endows silk proteins with water-responsive self-contraction capabilities, leading to the development of innovative self-contracting silk-based skin tensioners (SSSTs). To align with clinical requirements, skin tension regulation materials are functionalized by testing for their self-contraction, near-infrared laser heating function, and bacteriostatic properties. The SSSTs exhibited remarkable self-contraction properties, drug-loading and sustained-release capabilities, notable antibacterial effects, controllable degradation, and good biocompatibility. Moreover, the near-infrared light heating function effectively increased subcutaneous temperature, demonstrating its potential for enhancing and prolonging skin lifting effects. Therefore, SSSTs can be applied for skin tension regulation to improve and delay skin aging. The results may pave the way for novel strategies in skin rejuvenation, with broad implications for the field of skin anti-aging.
研究领域:
生物材料学
·
医学工程
·
皮肤科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymer Chemistry
·
2019
·Vol. 10
·期 25
·3488-3496
·
IF 4.76
Tian Tian,Jiao Wang,Shanshan Wu,Zijian Shao,Tao Xiang,Shaobing Zhou
Shape memory hydrogels with capacity of shape deformation after being triggered by physiological stimuli have potential to be used in biomedical fields. In this study, a body temperature and water-responsive shape memory hydrogel with excellent mechanical properties was prepared by crosslinking dopamine-terminated tetra-poly(ethylene glycol) (4-arm PEG) with an oxidation reaction. By adjusting the water content of hydrogels, the temperature/water responsivity and the mechanical properties could be well controlled. Under the synergistic effect of body temperature and water stimulation, the hydrogels can achieve fast shape recovery with a recovery time of 1 min 14 s, and a recovery ratio of 98.9%. Tensile tests reveal that the gel has good mechanical properties. The tensile fracture strength can reach the megapascal level ranging from 2.68 to 13.02 MPa, and the elongation at break can reach 2501%. The integration of body temperature and water-induced shape memory properties and mechanical properties will broaden the application of the 4-arm PEG hydrogel in the biomedical field.
研究领域:
生物材料学
·
医学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2021
·Vol. 12
·期 7
·1014-1022
·
IF 5.582
Xuemin Li,Feng Ye,Jie Wang,Zhaobin Chen,Xiaoniu Yang
Whether running or driving, slippery surfaces have always been the enemy of speed and safety. In this work, water-retention-state-responsive polyurethane (WRSRPU) was synthesized via introducing zwitterionic sulfobetaine (SB) onto its polymer chains. With strongly hydrophilic properties, the SB segment, when its content is increased to a certain level, is able to significantly change the mechanical properties, e.g., the modulus and tribological behavior, of thus-obtained polyurethane upon exposure to wet conditions, and these properties are reversible via switching the water absorption and release behavior. Even at different humidity levels, the mechanical properties of polyurethane can change significantly with an increase in water absorption. This unique water-responsive behavior of thus-obtained polyurethane opens up a stable and proactive approach for solving the problem of skidding under wet conditions, which is a long-established troublesome issue in daily life, sports, and transportation.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 33
·2401732
·
IF 18.5
Xiaoyun Xu,Zhuang Wang,Yupei Su,Ke Zhang,Min Li,Qi Zhang,Shuai Zhang,Yi Zhao,Qinfei Ke,Hong Hu,Robert J. Young,Shanshan Zhu,Jinlian Hu
Hydration-induced shape-morphing behavior has been discovered in many natural fiber-based materials, yet this smart behavior in regenerated fibers from biopolymers lacks investigation. Here, hierarchically structured silk fibers are developed with anisotropic long-range molecular organization and water-responsive effects resembling natural spider silk. The regenerated silk fibers exhibit the water-triggered shape-memory effect and a water-driven cyclic response. The reversible hydrogen bonds and transformation in the metastable secondary structure from α-helices/random coils to β-sheets are explored as the mechanisms responsible for the water-responsiveness. The silk fibers obtained possess a tensile strength higher than 104 MPa at a fracture strain of ≈100%, showing noticeable toughness. The water-responsive silk fibers exhibit a shape recovery rate of ∼83% and generate a maximum actuation stress of up to 18 MPa during the water-driven cyclic contraction that outperforms most traditional natural textile fibers. The regenerated silk fibers show potential for use in water-driven actuators, artificial muscle, and smart fabrics based on the integration of suitable mechanical properties and water responsiveness.
研究领域:
材料科学
·
生物医学工程
·
纺织科学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2017
·
IF 4.075
Yongkang Bai,Xin Chen
Herein, a fast water responsive shape memory polymer composites based on hydroxyethyl cellulose (HEC) has been fabricated by crosslinking with graphene oxide (GO) and citric acid (CA). The swelling behavior, mechanical properties, micro-topography, thermal stability, as well as water and moisture induced shape memory performance of this composite were all fully investigated to demonstrate its functions. After crosslinking with GO and CA, the composite exhibited excellent mechanical properties with tensile strength over 100 MPa, which was nearly 4 times higher than pure HEC. Moreover, the pre-deformed composite was able to fully recover to its original shape in aqueous environment, which not only quickly happened in water (14 s), but also occurred in wet air with relative humidity about 70 within only 5 min. With such outstanding properties, we envisage that this composite could play a significant role in developing new generations of water responsive sensors, actuators and biomedical devices.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Duo Meng,Qiangli Zhao,Xiaoyue Cheng,Jianhua Ma,Lingyan Kong,Xinhai He,Jianwei Li
Cellulose-based water-responsive shape memory materials have received widespread attention due to their wide range of sources, high response rate, and environmental friendliness. However, fast responsive shape memory polymers (SMPs) tend to lose wet strength due to excessive hydration. Thus, it greatly limits the application range of cellulose-based water-responsive shape memory materials. To address this issue, in this work, a cellulose nanofiber (CNF) nanocomposite membrane with high water-induced shape memory properties was successfully prepared containing polyvinyl alcohol (PVA) and lignin (LIG). Citric acid (CA) was used as the cross-linking agents. Changes in the content ratio of CNF to PVA and the amount of LIG added will change the crosslinked network structure of the CA/LIG/PVA/CNF membrane, leading to changes in the microstructure, water responsiveness and mechanical properties of the membrane. With the addition of LIG, the fracture surface of the microstructure will orient along longitudinal direction and form a densely packed layered structure. The increase content ratio of CNF to PVA can improve the compatibility of each component. The water-induced shape memory recovery rate of the nanocomposite can reach 100% within 4 s. In the dry state, the maximum tensile strength of the film can reach 138.0 MPa, and the maximum tensile modulus of the film can reach 9.0 GPa. After wet swelling, the highest tensile strength and tensile modulus are up to 60 MPa and 0.7 GPa, respectively. The CNF nanocomposite film has excellent performance in blocking ultraviolet and the transmittance value of the membrane is below 8% in the ultraviolet region of 200–400 nm. Hence, the resultant CA/LIG/PVA/CNF membrane will have potential applications in smart science and the provide a framework for developing a cellulose-based shape memory polymer.
研究领域:
材料科学
·
生物学
·
环境科学
✓ 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）