POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 8
·3297-3308
·
IF 3.665
Lin Xia,Qi Wang,Jiafeng Meng,Zhenguo Ma,Ping Zhao
A series of thermal and electro double-stimulus shape memory composites were processed using natural Eucommia ulmoides gum (EUG) and carbon nanotubes (CNTs). Mechanical, cure, and thermal properties were studied by universal testing machine, differential scanning calorimetry (DSC), and dynamic mechanical analysis (DMA), respectively. The shape memory behavior of the composites was explored via heat and electrical stimulation. The cross-linked network in the composites acted as a fixed domain, and the crystalline regions acted as a reversible domain during shape memory process. We studied the shape memory behavior of composites at different voltage and monitored the temperature change of composites during the process of electro-induced deformation memory in real time. Experimental results showed that appropriate amount of carbon nanotubes could not only improve the strength of composites but also provide electrical shape memory properties to composites. So, it is underscored that these kinds of shape memory composites exhibit excellent electro-responsive properties and have the potential to be used for intelligent and multiresponse shape memory applications.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Jiangbo Guo,Yajuan Li,Yajun Zhang,Jujie Ren,Xudong Yu,Xinhua Cao
Coordination-driven self-assembly with controllable properties has attracted increasing interest because of its potential in biological events and material science. Herein, we report on the remote, instant, and switchable control of competitive coordination interactions via ultrasound and heat stimuli in a hydrogel network. Configurational coordination changes result in the transformation of blue-emissive and opaque Al3+–amide aggregations to yellow–green-emissive and transparent Al3+–terpyridine aggregations. Interestingly, circularly polarized luminescence “off–on” switches of the metallo-supramolecular assembly are also created by these configuration changes. Additionally, the impact of the stoichiometric ratio of Al3+ and LysTPY on the assembly is also studied in detail. With a higher content of Al3+, the hydrogel with branched and abundant junctions exhibited robust, self-healing, and self-supporting properties. This in-depth understanding of the coordination interaction adjustment will afford new insights into the preparation of stimuli-responsive metallogels.
研究领域:
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 26
·12111-12127
·
IF 3.5
Zhao Yanna,Bai Xiaowei,Zhang Yingying,Wang Yuqi,Huang Yuqing,Hou Wentong
Acylhydrazone bonds can participate in dynamic exchange reactions under acid-stimulated conditions, and disulfide bonds can participate in dynamic exchange reactions under thermally stimulated conditions. It is of great significance to prepare epoxy vitrimer that can rapidly self-repair under acid and thermal stimulation conditions. In this paper, vanillin was used as raw material, and monomer (VAN-AD) containing acylhydrazone bond was synthesized by reaction with adipic dihydrazide. Then, VAN-AD and 4-aminophenyl disulfide (SS) were cured together with glycerol triglycidyl ether to prepare an epoxy vitrimer with acylhydrazone and disulfide dual dynamic covalent bonds. Where VAN-AD provides some of the flexible chain segments and acylhydrazone bonds and SS provides the aromatic phenyl and disulfide bonds. The material was prepared in a simple process and under mild condition, and the properties of the material were optimized by changing the ratio of VAN-AD to SS. The T g of the material was 50 °C when the ratio of SS was the highest, the thermal stability was enhanced with the increase of the ratio of SS, and the maximum tensile strength up to 50.9 MPa, and the material can be completely degraded by DMF with 5% HCl. It is worth noting that the material shows rapid self-healing properties under acid-heat conditions, self-healing rates up to 97.37%, and the tensile strength can reach 26 MPa after repair. The material can be successfully remodeled by hot pressing for 1 h at 140 °C and 10 MPa. Graphical abstract
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
Energy & Environmental Science
·
2024
·
IF 32.4
Fakang Xie,Yu Du,Mengfei Lu,Shicheng Yan,Zhigang Zou
The sluggish kinetics of the oxygen evolution reaction (OER) greatly limits the efficiency of water splitting. The high OER overpotentials would originate from the high electron transfer barriers in the electrolyte/catalytic layer/catalyst core interfaces during the water oxidation reactions. Here, we assemble the temperature-dependent magnetic YFe1-xMnxO3 core and the paramagnetic YFeOOH shell to form a YFe1-xMnxO3@YFeOOH core-shell structured catalyst to explore the effects of thermal-stimulated magnetic state of catalytic materials on OER kinetics. We find that the thermal-stimulated paramagnetic state of YFe1-xMnxO3 core contributes to the accelerated electron transfer at the YFe1-xMnxO3@YFeOOH core-catalytic layer interface. Meanwhile, it improves the intrinsic OER activities of the YFeOOH catalytic layer. The thermal-stimulated magnetic transition of YFe1-xMnxO3 (from antiferromagnetic to paramagnetic) enlarges the magnetic disorder at the YFe1-xMnxO3@YFeOOH interface to reduce the spin flipping barriers and induces to produce the highly OER-active electronic states for YFeOOH catalytic layer due to the strong interactions between YFe1-xMnxO3 core and YFeOOH catalytic layer, thus breaking the linear Arrhenius relationship. Our findings provide a new low-barrier OER route by thermal-stimulated magnetic disordering.
研究领域:
材料科学
·
电化学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 31
·10527-10534
·
IF 6.4
Peng Yang,Yifan Xie,Li Wen,Liyu Gan,Linxiao Deng,Hongli Zhang,Jiahe Li,Zeyu Feng,Chutian Zhang,Lixin Xu,Gang Zou
Achieving strong and dynamic tunable chiroptical responses in flexible films is highly desirable for potential applications including 3D optical displays, biosensors, and so on. Recently, controlled twisted stacking of two anisotropic layers became a popular strategy to fabricate artificial chiral nanostructures. However, in most cases, their structure and chiroptical responses are fixed, limiting their practical applications. Herein, we employed polydiacetylene (PDA)–Cs+ and PDA–Zn2+ assemblies as the individual layers within the twisted stacking structures and the hybrid films exhibited giant optical activity as well as excellent mechanical deformability. The chromatic transitions of the PDA layer under in situ water or electrothermal stimuli enable simultaneous control of two circular dichroism (CD) characteristics (magnitude and spectral position). By taking advantage of such programmable chiroptical responses, we demonstrate that PDA films have potential for full color, fast responsive, and circular polarization-based multiplex laser displays and higher-dimensional anti-counterfeiting applications. This work not only provides flexible chiral PDA films with strong and dynamic tunable chiroptical responses but is also of great fundamental value for the rational design of smart chiroptical devices.
研究领域:
材料科学
·
光学
·
生物传感
✓ 已验证
产品关联
DOI
高影响因子
ACS Biomaterials Science & Engineering
·
2025
·
IF 5.5
Simin Lai,Chenxi Shi,Liting Yuan,Kefeng Li,Xiaojing Wang,Xi Yu,Pengbi Liu,Huan Wang,Lihuan Wang,Hui Yu
Complex wound management remains a significant global challenge, and the development of multifunctional wound dressings that can effectively promote wound healing remains an urgent clinical need. Herein, a kind of multifunctional hydrogel wound dressing that combines bacteriostasis, self-healing capability, growth factor release, electrical stimulation, and photothermal stimulation is developed. This kind of wound dressing is generated by adding protocatechualdehyde (protocatechuic aldehyde (PA)), short core–shell fibers loading with platelet-rich-plasma (platelet-rich plasma fibers), and polydopamine-coated carbon nanotubes (PDA@CNTs) into quaternary ammonium chitosan (QCS) solution to form a shear-reversibly cross-linked QCS/PA/PDA@CNTs-PRP hydrogel. The obtained hydrogels possess impressive properties, including high swelling capacity (445–852%), strong adhesion ability (16.4–36.7 kPa), self-healing ability, injectability, conductivity (0.24–0.46 S/m), and photothermal properties. Notably, under near-infrared irradiation, the hydrogel exhibits a highly efficient bactericidal activity. In vitro experiments demonstrated that the hydrogel exhibits excellent biocompatibility and anti-inflammatory capability as well as its ability to stimulate cell proliferation, migration, and tubule formation. Moreover, the in vivo studies further confirmed that with the additional assistance of near-infrared light and electrical stimulation, the hydrogel further promotes wound epithelization, angiogenesis, and collagen deposition. Consequently, this hydrogel provides a promising therapeutic strategy for complex wound healing.
研究领域:
生物材料学
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医学工程
·
再生医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Laser & Photonics Reviews
·
2024
·
IF 9.8
Xiangyu Zhang,Zhigang Wang,Chunlong Xu,Dangli Gao,Qing Pang,Jie Xu,Xiaojun Wang
Persistent phosphor as a printing anti-counterfeiting material has attracted strong attention owing to its inherent luminescent decay process and multi-mode luminescence characteristics under external field stimulation. However, the dynamic persistent luminescence (PersL) pattern of a single material is only manifested in color changes and still faces the problem of being easily decrypted. Herein, a multi-color luminescent material with a wide range distribution of traps is developed, which can emit strong white PersL. In addition, the phosphors show an intelligent response of thermo-stimulated luminescence to ambient temperature via recalling the charging temperature of the traps. The PersL mechanism is proposed based on electron transfer between PbO 6 and TbO 6 octahedrons through the O bridging. Based on the intelligent response of thermo-stimulated luminescence to temperature, high-throughput multi-channel luminescence anti-counterfeiting can be achieved on a single phosphor recording layer. This study not only provides further insights into the PersL mechanism, but also opens a new door for constructing intelligent responsive anti-counterfeiting materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Huocheng Lv,Peng Du,Weiping Li,Laihui Luo
To settle the challenges of optical thermometry with high sensitivity, a series of Tm3+/Yb3+-codoped Y2Mo3O12 (YMO:Tm3+/2xYb3+) submicron particles were developed via a sol–gel route. Excited by 980 nm, bright upconversion (UC) emissions of Tm3+ are observed, in which the optimum intensity is realized when the Yb3+ concentration is 13 mol %. Moreover, the UC mechanism of the emissions originating from the 1G4 level is a three-photon absorption process, while that of the emission from the 3F2,3 level is a two-photon absorption process. Furthermore, thermally enhanced emission intensities are realized in the studied compounds due to the negative thermal expansion effect. Notably, owing to the coexistence of improved energy transfer and cross-relaxation processes at elevated temperature, the intensities of the UC emissions from the 1G4 level increase and then decrease with raising the temperature, whereas that of the UC emission from the 3F2,3 level is enhanced monotonously as temperature increases. Via analyzing the inconsistent thermal quenching characteristics of the UC emissions, we explored the thermometric behaviors of the synthesized products and found that their sensitivities are dependent on the spectral mode. Through investigating the dependence of the emission intensity rate of the emissions from 3F2,3 → 3H6 to 1G4 → 3F4 transitions on temperature, one knows that the maximum absolute and relative sensitivities of the resultant submicron particles are 0.198 K–1 and 3.27% K–1, respectively. Additionally, the thermometric behaviors of YMO:Tm3+/2xYb3+ submicron particles can also be manipulated via altering the Yb3+ concentration.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Jiaqi Zhang,Hao Song,Yanjie Zhang,Xiuping Wu,Bing Li,Jingjie Yu
A series of Yb 2+ and Dy 3+ doped SrSi 2 O 2 N 2 phosphors with enhanced crystallinity and photoluminescence properties have been successfully synthesized by two-step method using Sr 2 SiO 4 as precursor. It is clearly indicated from XRD results that Yb 2+ ions can substitute Sr sites in SrSi 2 O 2 N 2 crystal and exhibit pure phase and well-crystalline in comparison with the samples prepared by traditional solid-state reaction. The excessive amount of Si 3 N 4 in the reactants promoted the formation of pure SrSi 2 O 2 N 2 phosphors phase. SrSi 2 O 2 N2: Yb 2+ phosphors show emission band at 583 nm and the broad excitation peaks located at 308 nm, 384 nm and 447 nm, covering the emission wavelength of NUV and blue chips. Compared with the sample prepared by traditional one-step solid-state reaction method, a dramatic enhancement of photoluminescence emission intensity (∼1.75 times) can be observed for SrSi 2 O 2 N 2 : 0.01 Yb 2+ phosphor synthesized by two-step method. Due to the concentration quenching, the luminescence intensity reaches the maximum when doping concentration of Yb 2+ ions is 1 mol%, which is identified as the electric dipole-electric dipole interaction . Notably, Yb 2+ and Dy 3+ co-doped SrSi 2 O 2 N 2 phosphors with pure phase exhibit a unique thermal-stimulated luminescence property under NUV excitation, indicating the potential application in optical information storage. Furthermore, the mechanism of thermal-stimulated luminescence has been proposed.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2017
·
IF 4.364
Jie Zhang,Zhenxing Yue,Yu Luo,Xiaohua Zhang,Longtu Li
Relaxation phenomena in dielectrics are well known to be closely related to their defect chemistry. However, the relaxation behavior of microwave dielectrics has seldom been considered, despite these materials being an important member of the electroceramic family. Here, the relaxation behavior of the typical microwave dielectric ceramic barium tetratitanate (BaTi 4 O 9 ) was investigated. Significant thermally stimulated relaxation was observed in both dielectric spectroscopy and thermally stimulated depolarization current (TSDC) measurements, and the correlation between relaxation and defect behavior was addressed. TSDC characterization revealed that defect dipoles [(Ti Ti ' )−(V O •• )] with activation energies ( E a ) of 0.32–0.36 eV appeared at low temperature, while in-grain and across-grain boundary oxygen vacancies (V O •• ) appeared at higher temperature, yielding E a of 0.30–0.48 eV and 0.65–1.01 eV, respectively. It was further believed that these two types of defects, (Ti Ti ' )−(V O •• ) and V O •• , were correspondingly responsible for the dielectric relaxation observed at low and high temperature. The relaxation behavior of several typical Ti-containing microwave dielectrics, such as BaTi 4 O 9 , TiO 2 , MgTiO 3 and Ca 0.8 Sr 0.2 TiO 3 , was compared, which suggests that microwave dielectric performance and defect behavior are closely related to the connections of TiO 6 octahedra in the materials.
研究领域:
材料科学
·
电介质物理
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yuanyuan Hu,Dangli Gao,Xiangyu Zhang,Sining Yun
Persistent luminescence (PersL) that carries remote information is of paramount importance for intelligent anti-counterfeiting applications. However, the feeble PersL intensity, along with its uncontrollability, hamstrings their practical utilization. Here we develop LiNbO 3 (LNO):Pr,Bi phosphor with enhanced red PersL by trace doping of Sm 3+ . The LNO:Pr,Bi,Sm phosphor exhibits quadruplet luminescence, namely polychrome photoluminescence, PersL, and photo/thermo-stimulated luminescence (PSL/TSL). Particularly, the enhanced TSL can carry remote subjective information independent of the phosphor itself by controlling the temperature. A mechanism of PersL enhancement is proposed based on constructing reversible photovoltaic cells and electrolytic cells by photothermal redox reactions using Bi 3+ + V O and Bi 3+ /Pr 3+ + V Li ' ion pair. This study has initiated the exploration of designing information storage PersL materials for more sophisticated remote intelligent anti-counterfeiting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Hui Wang,Yuling Liang,Wei Gao,Renfeng Dong,Chaoyang Wang
An emulsion hydrogel motor (E-H motor), constituted by low-boiling-point oil fuel and a hydrogel matrix, is prepared through a simple yet versatile oil-in-water (O/W) emulsion template method. The E-H motor can be efficiently propelled by the bubbles generated under a thermal stimulus. As thermally induced explosion occurs inside the E-H motor (diameter ∼4.0 mm and length ∼6.0 mm), the gas bubbles resulting from thermotropic phase transition are violently ejected from one side, leading to a fast speed of 14.78 ± 4.82 mm s–1 in a 60 °C aqueous solution. Additionally, multiple water-insoluble organic solvents can serve as the fuel for self-propulsion, which demonstrates the favorable universality of the E-H motor. The magnetic navigation and near-infrared propulsion can be realized through incorporating hydrophilic iron oxide (Fe3O4) nanoparticles and graphene oxide (GO) into the aqueous phase. Moreover, the synchronous integration of GO and enrofloxacin bactericide can enable intelligent targeted cargo transportation and delivery. The attractive self-propulsion performance, precise locomotion control, and formidable integration ability of the emulsion hydrogel-based miniaturized soft motor hold great promise for numerous practical applications.
研究领域:
材料科学
·
生物医学工程
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）