POLYMER ENGINEERING AND SCIENCE
·
2019
·
IF 1.92
Li Shuai,Zhang Jun,Chen Jianjun,Yao Ming,Liu Xuepeng,Jiang Zhiguo
Biodegradable body temperature-responsive shape memory polyurethanes, with self-healing function, were synthesized here from PCDL, MDI and different chain extenders, in which the chain extenders are designed to adjust their transition temperatures and shape memory properties. Once deformed at proper temperature, they show more than 96% shape fixation until heated near body temperature, where they recover their original shape (100%) within 20 s. Moreover, these polyurethanes could be self-healing at proper temperature, which makes them available in many medical fields. POLYM. ENG. SCI., 59:E310–E316, 2019. © 2019 Society of Plastics Engineers
研究领域:
材料科学
·
医学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2017
·Vol. 27
·期 22
·1700653
·
IF 12.124
Jia Yan,Marco-Tulio F. Rodrigues,Zhilong Song,Hongping Li,Hui Xu,Huan Liu,Jingjie Wu,Yuanguo Xu,Yanhua Song,Yang Liu,Peng Yu,Wei Yang,Robert Vajtai,Huaming Li,Shouqi Yuan,Pulickel M. Ajayan
Many unique properties arise when the 3D stacking of layered materials is disrupted, originating nanostructures. Stabilization, and further reorganization of these individual layers into complex 3D structures, can be essential to allow these properties to persist in macroscopic systems. It is demonstrated that a simple hydrothermal process, assisted by ionic liquids (ILs), can convert bulk g-C 3 N 4 into a stable hydrogel. The gelation occurs through delamination of the layered structure, driven by particular interactions between the IL and the carbon nitride sheets, forming an amphiphilic foam-like network. This study employs spectroscopic and computational tools to unravel the gelation mechanism, and provides a rational approach toward the stabilization of 2D materials in hydrogels. The solution-processable hydrogels can also be used as building blocks of complex devices. Chemiresistive gas sensors employing g-C 3 N 4 3D hydrogels exhibit superior response at room temperature, enabling effective gas sensing under low power conditions.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS-CONDENSED MATTER
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2021
·Vol. 34
·期 10
·105803
·
IF 2.333
Jun Li,Dongpeng Zhao,Han Bai,Zhi Yuan,Zhongxiang Zhou
Magnetic-field induced dynamic magnetoelectric coupling effects and polarization performance of Z-type Sr3Co2Fe24O41 (SCFO) ceramic has been investigated. Results found that SCFO's transverse tapered magnetic structure can induce electric polarization, and its electric polarization direction will not change under external magnetic effects. First-order dynamic magnetoelectric coupling coefficient (α) and second-order dynamic magnetoelectric coupling coefficient (β) of SCFO exhibited strong response main in magnetic structural phase transition region. The magnetoelectric structural phase transition position appeared in low magnetic field, and the magnetic moment vector and its corresponding electric polarization vector of SCFO exhibited the most unstable state near its equilibrium position, which is beneficial for inducing strong dynamic magnetoelectric coupling response. When the applied magnetic fields to SCFO increased, the magnetic moment stability near the equilibrium position increased, and the dynamic magnetoelectric coupling response decreased. Results showed that the dynamic magnetoelectric coupling response of SCFO can bear T1 = 370 K high temperature. The dynamic magnetoelectric coupling response induced by low magnetic fields in SCFO contributes to its actual application in next generation magnetoelectric information storage devices.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Soft Matter
·
2021
·Vol. 17
·期 9
·2603-2613
·
IF 3.679
Xuan Zhang,Lucas P. Kreuzer,Dominik M. Schwaiger,Min Lu,Zhengwei Mao,Robert Cubitt,Peter Müller-Buschbaum,Qi Zhong
Abnormal fast dehydration and rehydration of light- and thermo-dual-responsive copolymer films of poly(oligo(ethylene glycol) methyl ether methacrylate-co-6-(4-phenylazophenoxy)hexyl acrylate), abbreviated as P(OEGMA300-co-PAHA), are triggered by UV radiation. Both rapid kinetic processes are probed by in situ neutron reflectivity (NR). The transition temperatures (TTs) of P(OEGMA300-co-PAHA) are 53.0 (ambient conditions) and 52.5 °C (UV radiation, λ = 365 nm). Thin P(OEGMA300-co-PAHA) films show a random distribution of OEGMA300 and PAHA segments. They swell in a D2O vapor atmosphere at 23 °C (below TT) to a swelling ratio d/das-prep of 1.61 ± 0.01 and exhibit a D2O volume fraction φ(D2O) of 39.3 ± 0.5%. After being exposed to UV radiation for only 60 s, d/das-prep and φ(D2O) significantly decrease to 1.00 ± 0.01 and 13.4 ± 0.5%, respectively. Although the UV-induced trans–cis isomerization of the azobenzene in PAHA induces increased hydrophilicity, the configuration change causes a breaking of the intermolecular hydrogen bonds between OEGMA300 and D2O molecules and unexpected film shrinkage. As compared to thermal stimulus-induced dehydration, the present dehydration rate is 100 times faster. Removal of the UV radiation causes immediate rehydration. After 200 s, d/das-prep and φ(D2O) recover to their hydrated states, which is also 30 times faster than the initial hydration. At 60 °C (above TT), thin P(OEGMA300-co-PAHA) films switch to their collapsed state and are insensitive to UV radiation. Thus, the UV-induced fast dehydration and rehydration depend on the existence of hydrogen bonds.
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
KEY ENGINEERING MATERIALS
·
2013
·
IF 0
Xin De Tang,Ye Chen,Fa Qi Yu,Mei Shan Pei
Organic/inorganic hybrid materials based upon stimuli-responsive copolymers have attracted an inceasing attention. Compared with the polymeric materials, these hybrid materials can form aggregates in aqueous solution with much more stable shape-persistance due to the inorganic structure, which facilitate the mass delivery and long-term life. A novel hybrid material based on a new reactive block copolymer, poly(ethylene oxide)-block-poly{3-(trimethoxysilyl)propyl methacrylate-co-N-isopropylacrylamide-co-6-[4-(4-methoxyphenylazo)phenoxy]hexyl methacrylate} [PEO-P(TMSPMA-NIPAM-AzoMA)] was synthesized via atom transfer radical polymerization (ATRP). The vesicles were obtained by self-assembly of the resulting block copolymer in a selective solvent, and then the PTMSPMA block was subjected to hydrolysis and polycondensation reaction to fix vesicle wall in the presence of triethylamine as a catalyst. The photo- and thermo- dual-responsive properties of the vesicles were investigated.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Junyao Li,Ruixiang Li,Chuanye Sang,Mingji Xu,Chunhua Luo,Hui Peng,Hechun Lin
Dehydration of layer metal hydroxides at controlled annealing temperatures is an efficient strategy for regulating the material properties. In this work, we studied the dehydration process of α-Co(OH) 2 with flower-like nanostructure under various conditions and explored their gas sensing application. Stable dehydrated α-Co(OH) 2 obtained by solidification in air at 140 °C, exhibits specific selective low-temperature gas-sensing behavior for Et 3 N. The response to 50 ppm Et 3 N was up to 9.52 at 140 °C operating temperature with short response and recovery time. The sensor is the high reversibility and the excellent reproducibility with ppb level detection limit. The partial oxidation of the dehydration α-Co(OH) 2 in the air has a significant impact on the sensing performance. The large specific surface area of the dehydration α-Co(OH) 2 affords rich reactive sites for both reaction and adsorption of Et 3 N molecules. This research provides a new solution for building low-temperature high-performance amine sensor.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2025
·
IF 11
Zheng Zi-Chen,Liu Ke-Wei,Zhou Yi-Wen,Zhang Zi-Cong,Qin Yong-Bin,Luo Yi-Fan,Xu Kai-Chun,Guo Liang-Chao,Debliquy Marc,Bittencourt Carla,Zhang Chao
Bismuth-doped antimony tungstate (Bi-doped Sb 2 WO 6 ) microspheres were synthesized via a novel hydrothermal synthesis approach. These microspheres were then used as active layers in gas sensors for the detection of carbon dioxide (CO 2 ), a significant greenhouse gas and a critical parameter for evaluating air quality. The incorporation of bismuth significantly enhances the gas-sensing performance of the Sb 2 WO 6 microspheres, with the 4% Bi-doped sensing active layer achieving a remarkable response value of 15 when exposed to 200 ppm of CO 2 , outperforming the undoped Sb 2 WO 6 . Furthermore, the selectivity of the 4%Bi-Sb 2 WO 6 sensor toward CO 2 gas was enhanced relative to the Sb 2 WO 6 sensor. The fundamental mechanisms of gas sensing and the factors contributing to the improved CO 2 response of 4%Bi-Sb 2 WO 6 microspheres were investigated using density functional theory. Bi-doped Sb 2 WO 6 materials exhibit significant advantages in gas-sensing applications, including improved conductivity, enhanced gas adsorption capacity, increased reaction rates, good chemical stability, excellent selectivity, and the ability to adjust electron density. These characteristics enable Bi-doped Sb 2 WO 6 to demonstrate higher sensitivity and rapid response capabilities in gas sensors, making it suitable for practical applications. Graphical abstract
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Yun-Zhi Dai,Shu-Yu Liang,Chao Lv,Gong Wang,Hong Xia,Tong Zhang,Hong-Bo Sun
Micro/nanoscale gas sensors attracted more attention because of their potential application in the emerging areas such as electronic capsules, wearable devices, and microdrone detectors. However, it is still a challenge to achieve micro/nanoscale sensors with controllable processing parameters of active components and fast response and recovery capability. Here, a flexible and high precision femtosecond laser direct-writing technology is selected to print various semiconductor metal oxides nanoparticles into microscale designable patterns with mask-free. And by using Pd-doped WO 3 • x H 2 O nanoparticles we have fabricated single Pd-WO 3 • x H 2 O microwire (SPWM) as gas sensors, which represented high sensitivity, faster response and recovery. Especially, for ammonia gas sensing the SPWM with pre-designed lengths can possess ultrafast response with response/recovery time of 1.4/3.3 s in 50 ppm NH 3 , or low limit-of-detection of 1 ppm at room temperature. This kind of micro-scale gas sensor is expected to be applied to human health monitoring, environmental air detection and other integrated intelligent devices.
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
产品关联
DOI
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
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Lijia Zhao,Shupeng Sun,Su Zhang,Zhi Liu,Baoyu Huang,Nan Wang,Jianwei Zhang,Xiaogan Li
The hollow ZnO @ TiO 2 heterostructured nanospheres were synthesized by hydrothermal method using carbon nanospheres as sacrificed templates. With UV activation, the response of ZnO @ TiO 2 based chemiresistive-type sensors to 10 ppm formaldehyde is 11.02 at room temperature which is 5.48 times larger than that of the pure hollow ZnO. The response and recovery time significantly reduced to 14 s and 16 s. Selectivity, stability and repeatability of the hollow ZnO @ TiO 2 based sensor under UV-activation have also been examined. The sensing mechanism of the sensor to formaldehyde have been investigated by AC impedance spectroscopy , in-situ DRIFTS , and DFT theoretical calculation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Ruixue Liang,Haojie Yu,Li Wang,Long Lin,Nan Wang,Kaleem-ur-Rahman Naveed
Shape memory hydrogels (SMHs), a promising class of smart materials for biomedical applications, have attracted increasing research attention owing to their tissue-like water-rich network structure. However, preparing SMHs with high mechanical strength and body temperature-responsiveness has proven to be an extreme challenge. This study presents a facile and scalable methodology to prepare highly tough hydrogels with a body temperature-responsive shape memory effect based on synergetic hydrophobic interactions and hydrogen bonding. 2-Phenoxyethyl acrylate (PEA) and acrylamide were chosen as the hydrophobic monomer and the hydrophilic hydrogen bonding monomer, respectively. The prepared hydrogels exhibited a maximum tensile strength of 5.1 ± 0.16 MPa with satisfactory stretchability, and the mechanical strength showed a strong dependence on temperature. Besides, the hydrogel with 60 mol % PEA shows an excellent body temperature-responsive shape memory behavior with almost 100% shape fixity and shape recovery. Furthermore, we applied the hydrogels as a shape memory embolization plug for simulating vascular occlusion, and the embolism performance was preliminarily explored in vitro.
研究领域:
生物材料学
·
医学工程
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULES
·
2013
·
IF 5.521
Meihan Dan,Yang Su,Xin Xiao,Shentong Li,Wangqing Zhang
A new family of the thermo-responsive polymers based on poly[N-(4-vinylbenzyl)-N,N-dialkylamine] with the pendent amine group as well as the doubly thermo-responsive triblock copolymer were synthesized by reversible addition–fragmentation chain transfer (RAFT) polymerization. These polymers showed the lower critical solution temperature (LCST) and/or the upper critical solution temperature (UCST) in alcohol and in the alcohol/water mixture. The polymer molecular weight, the polymer concentration, the cosolvent/nonsolvent and the deuterated solvent affecting the LCST and/or UCST were investigated, and their great influence on the LCST/UCST was demonstrated. The origin of the phase transition of poly[N-(4-vinylbenzyl)-N,N-dialkylamine] at LCST upon heating was investigated and the possible reason was proposed. The doubly thermo-responsive triblock copolymer of PVMA53-b-PVEA108-b-PVMA53 underwent phase transition at two LCST temperatures. The PVEA108 block underwent the initial phase transition at the first LCST of 32.5 °C to form core–corona micelles, and then the subsequent phase transition of the PVMA53 block took place at the second LCST of 54.5 °C to produce corona-collapsed micelles. The proposed polymers based on poly[N-(4-vinylbenzyl)-N,N-dialkylamine] are anticipated to broaden the thermo-responsive polymer range and will be useful in polymer science.
研究领域:
高分子化学
·
材料科学
✓ 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）