Nature Communications
·
2022
·Vol. 13
·期 1
·1-10
·
IF 17.694
Liu Jing-Yuan,Chen Ling,Wu Li-Ming
The argyrodite Ag 9 GaSe 6 is a newly recognized high-efficiency thermoelectric material with an ultralow thermal conductivity; however, liquid-like Ag atoms are believed to cause poor stability and performance irreproducibility, which was evidenced even after the 1 st measurement run. Herein, we demonstrate the abovementioned instability and irreproducibility are caused by standard thermoelectric sample hot-pressing procedure, during which high pressure promotes the 3-fold-coordinated Ag atoms migrate to 4-fold-coordinated sites with higher-chemical potentials. Such instability can be eliminated by a simple annealing treatment, driving the metastable Ag atoms back to the original sites with lower-chemical potentials as revealed by the valence band X-ray photoelectron chemical potential spectra and single crystal X-ray diffraction data. Furthermore, the hot-pressed-annealed samples exhibit great stability and TE property repeatability. Such a stability and repeatability has never been reported before. This discovery will give liquid-like materials great application potential.
研究领域:
材料科学
·
热电学
·
固体物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Ronghua Ma,Xiaoyan Wei,Chunfeng Wang,Shaohui Mao,Bing Chen,Yonghong Shao,Yu Fu,Keyu Yan,Dengfeng Peng
Mechanoluminescenece (ML) is a dynamic luminescence phenomenon of materials under various mechanical stimulation. Impurity doped ZnS shows high ML repeatability without any needs for extra excitation sources, thus making it very promising in applications like stress sensing and battery-free new light source . Lots of progress has been made in the last decades, however, the reproducible ML (RML) mechanism is still unclear to explain some basic phenomena like how the electron is excited to conduction band when undergoing mechanical actions or how the excitation energy is transferred to the dopants so efficiently. Based on comparative study of photoluminescence (PL) and ML in Mn 2+ doped ZnS prepared via melt-salt method, the RML energy routes in sphalerite ZnS: Mn 2+ is proposed herein, and further, a general mechanism is supposed which could apply to other RML systems. The excitation of RML is possibly generated by electron transfer during bond rebuilding in plastic deformation while the highly efficient energy transfer is realized through hole and electron capture by the dopant. According to this mechanism, we provide some prospects for further optimization of RML performance as well as discovery of new RML materials.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Shaofei Zhang,Hui Yang,Ying Ma,Yu Fang
A bis-nitrobenzoxadiazole (NBD) derivative of calix[4]arene (L 1 ) and a control compound (L 2 ), mono-NBD derivative of the calixarene were designed and prepared via click chemistry. Fluorescence studies demonstrated that L 1 as created can function as a switch with the presence of Ag + in THF, of which the free state of L 1 emits at ∼527 nm, but the binding state at 576 nm. Based upon this discovery, L 1 was studied as a chemo-sensor of Ag + in a mixture solvent of THF and H 2 O with a detection limit (DL) of ∼6.2 × 10 −7 mol/L. Presence of other commonly found metal ions shows little effect upon the determination. Moreover, the L 1 in the Ag + -L 1 complex could be fully released with introduction of HCHO, a bases for the sensitive and selective detection of the toxic chemical. The DL of this test is 6.6 × 10 −7 mol/L. Interestingly, binding and releasing of the fluorescent ligand could be repeated for at least 5 times. Furthermore, both sensing could be performed in a visualized manner. It is believed that the fluorescent compound as created should have a potential to find real-life applications.
研究领域:
化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2022
·Vol. 9
·期 12
·2105742
·
IF 17.521
Ke Li,Xingjie Zan,Chen Tang,Zhuangzhuang Liu,Jianghuan Fan,Gang Qin,Jia Yang,Wei Cui,Lin Zhu,Qiang Chen
Repeatability and high adhesion toughness are usually contradictory for common polymer adhesives. Repeatability requires temporary interactions between the adhesive and the substrate, while high adhesion toughness is usually achieved by permanent bonding. Integrating these two features into one adhesive system is still a daunting challenge. Here, the development of a series of viscoelastic elastomers composed of a soft and hard segment is reported, which exhibit tough, instant, yet repeatable adhesion to a variety of soft and hard surfaces. Such a combination of mutually exclusive properties is attributed to the synergy of high mobility of polymer chains and massive viscoelastic dissipation of the elastomers around the interface. By optimizing the relaxation time and mechanical dissipation, the resulting adhesives can achieve a tough yet repeatable adhesion toughness above 2000 J m −2 , superior to the best-in-class commercial adhesives. Numerous acrylate monomers are proven applicable to the preparation of such adhesives, validating the universality of the fabrication method. The application of these elastomers as adhesive and protective layers in soft electronics by virtue of their universal and tough adhesion to various soft and hard substrates is also demonstrated.
研究领域:
材料科学
·
化学工程
·
软电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Xiang Peng,Jiabei Liu,Yuming Tan,Rong Mo,Yong Zhang
High-performance gas sensors have huge application prospects and consumer demands in environmental monitoring, public security and other fields. Nevertheless, the conductive type metal oxide gas sensors prepared by traditional coating or dropping technology encounter challenges in low detection limit and excellent replication, hardly meeting the actual needs of trace harmful gas detection and mass production. Here, a uniform and high-quality CuO sensing film is formed quickly and efficiently by inkjet printing technology , which is expected to realize mass preparation of high-performance formaldehyde sensors. The CuO sensor can reach as low as 50 ppb formaldehyde detection limit, satisfying the monitor needs of the World Health Organization’s specified value 80 ppb. In addition, the gas sensors in each batch exhibit outstanding repeatability and stability with small deviation, and the relative mean deviations toward formaldehyde in the aspect of response, response and recovery times are all about only 5% between batches. The controllable micro-nano-level film thickness and uniform surface achieved by inkjet printing technology are the compelling reasons for low detection limit and superb reproducibility of gas sensors. Our work can offer a theoretical and experimental basis for large-scaled production of high-performance gas sensors from research to practical application.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED OPTICS
·
2019
·Vol. 58
·期 8
·2042-2049
·
IF 1.973
Hongpeng Liu,Rui Wang,Baohua Wang,Li Li,Xinying Jiao,Qinggong Song,Dan Yu
Reversibility and repeatability of the tensile deformation response in holographic sensors formed by highly stretchable acrylamide polymers have been investigated. The diffraction spectrum of the volume grating was used to characterize the deformation. Two-way shifts of peak wavelengths, i.e., redshift in transmission and blueshift in reflection, were observed in stretching. The reduction of the average refractive index provided experimental evidence for the physical mechanism. To achieve a linear response and high repeatability, the limitation of tensile displacement was determined as 5.0 mm, and the relevant deformation is 6.6%. This value can be considered as a boundary between the elastic and plastic deformations in samples with thicknesses less than 120 μm. There was a totally linear relation between peak wavelength and deformation within the elastic range. The reversible and repeatable deformation response validated the practical applicability of a holographic sensor.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
PubMed
高影响因子
POLYMER
·
2024
·
IF 4.1
Yuzhou Chen,Xiaolan Li,Jiaming Wang,Dong Zhou,Lishuang Yao,Yu Huang,Yongjun Liu
Liquid crystal elastomers (LCEs) have recently gained significant attention in the field of smart materials due to their ability to respond to external stimuli, offering substantial potential for practical applications in soft robotics and bioengineering where actuation and sensing are crucial. However, conventional LCEs typically have high driving thresholds, significantly limiting their practical utility. Thus, reducing the driving temperature of LCEs remains a critical challenge in current research. In contrast to complex chemical molecular modifications aimed at lowering the driving threshold, our work employs a straightforward one-step cross-linking method to synthesize bisacrylate LCEs with varying compositions . These LCEs exhibit remarkably low driving temperatures and improved actuation performance. The monofunctional and difunctional acrylate liquid crystal mixtures employed in our experiments possess different ranges of anisotropy and can be effectively incorporated into the liquid crystal elastomers . Following polymerization, these LCEs demonstrate actuation capabilities at temperatures as low as −18 °C while maintaining excellent performance even at elevated temperatures of up to 60 °C. Moreover, in a series of 50 repeat experiments, the LCEs exhibited exceptional repeatability with a minimal error rate of 2.0 %. Additionally, the introduction of carbon nanotubes into the LCEs resulted in achieving a significant angular deflection of up to 100° within a narrow range of low light intensities, specifically between 26.19 mW cm −2 and 32.38 mW cm −2 , highlighting the continued effectiveness of these materials even with this modification.
研究领域:
材料科学
·
智能材料
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Ying Xue,Chunmei Li,Jin Liu,Jiaojun Tan,Zhengzhou Su,Yumin Yang,Guoxian Zhang,Qiuyu Zhang
Microcapsule-based self-healing polymer has been demonstrated its potential application in various aspects, because their automatically repairing property endows the material with a longer lifetime. However, the limited number of healing times restricts the development of microcapsule-based self-healing system. Herein, a hierarchical microcapsule with multi-storage cells (HMMC) was designed and fabricated by an efficient in-situ polymerization strategy, which could repeatable release active agents to repair cracks in the same region. In this strategy, synthesis microcapsule-type stabilizers (MTS) with healing agent (dicyclopentadiene, DCPD) were used as stabilizers of Pickering emulsion to prepare HMMC by thiol-isocyanate click reaction. It was shown that HMMC exhibited a hierarchical structure with a central capsule covered by a layer of MTS. Thermogravimetric analysis (TGA) showed the core content of HMMCs was 51.52 %. Nuclear magnetic resonance (NMR) spectra and Fourier transform infrared (FTIR) spectra proved that the active DCPD was successfully encapsulated in each storage cells of HMMCs. The repeatable self-healing property was demonstrated by Electrochemical (EIS) and anticorrosion experiments.
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
EUROPEAN POLYMER JOURNAL
·
2018
·
IF 3.741
Kun Chang,Han Jia,Shu-Ying Gu
Polymers with self-healing ability have attracted great research efforts recently. A transparent self-healing polyurethane (PU) based on disulfide bonds is reported in this work. The crystalline structures, self-healing properties of the polyurethane were investigated by differential scanning calorimetry (DSC), X-ray diffraction measurements (XRD), dynamic mechanical analysis (DMA), stress relaxation and tensile tests. The as-prepared self-healing polyurethane was transparent due to low crystallinity and exhibited excellent self-healing properties, stretchability and healing repeatability. The healing efficiency and elongation at break at a moderate healing temperature were over 90% and 800%, respectively. Meanwhile, the self-healing polyurethane exhibited an excellent healing repeatability and service reliablility. The self-healing mechanism was analyzed through surface analysis of the scratches and shape memory effect. The system was composed of a polyurethane network, which was responsible for the autonomous crack closure due to its shape memory characteristic, and an intrinsic self-healing component through dynamic disulfide bond exchange. The self-healing polyurethane might have potential applications in the fields of flexible electronics, including artificial skins, soft robotics, etc.
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
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Ying Wang,Hong-Xing Li,Sheng-Ming Xie,Bang-Jin Wang,Jun-Hui Zhang,Li-Ming Yuan
Porous organic cages (POCs) are a new class of advanced porous molecular materials, which are self-assembled from discrete, shape-persistent, cage-like molecules through relatively weak intermolecular forces. POCs have recently received extensive interest in diverse fields due to their noteworthy features of good solubility, unique pore structure, high stability, tunable pore size and volume, and so on. In this study, we report a [3 + 6] prismatic homochiral POC (NC1-R) as the stationary phase for preparing a capillary gas chromatographic (GC) column by a static coating method. Various types of mixtures have been well separated on the coated column, involving n -alkanes, n -alcohols, alkylbenzenes, positional isomers, structural isomers, and cis- / trans -isomers. Most importantly, the column also exhibits excellent chiral resolution capability for racemates. Twenty-three racemates, including alcohols, epoxides, esters, lactones, ethers, amino acid derivatives, amines, and sulfoxides, have been well resolved on the column. Among these racemates, about half (11 of the 23) could not be resolved on a commercial β-DEX 120 column (per- O -methylated β-cyclodextrin-based column), suggesting the advantageous performance of the present column. Furthermore, the fabricated column shows good reproducibility in terms of the retention times of analytes, with relative standard deviations (RSDs) in the ranges 0.02–0.19 %, 0.12–0.36 %, and 0.41–0.59 % for intra-day ( n = 6), inter-day ( n = 6), and column-to-column ( n = 3), respectively, and good thermal stability at least up to 300 °C. This work demonstrates the good application prospects of NC1-R for GC separations, especially for GC enantioseparations.
研究领域:
分析化学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 35
·6742-6751
·
IF 7.571
Long Jiang,Tao Jing,Xiantao Shen
The development of an elution-free solid-phase extraction (SPE) process is of special interest in sample pretreatment. Due to the phase-change merits at relatively low temperatures and easy dissolution in n-hexane, wax spheres show great potential in this field. However, the conventional wax spheres possess a low affinity towards the target analytes when they are used as SPE adsorbents. In this study, using octadecanoic acid as the functional monomer and wax as the matrix, molecularly imprinted wax (MIW) spheres were successfully prepared. The obtained MIW spheres displayed remarkable molecular recognition ability and high selectivity towards the template. Interestingly, the as-synthesized molecularly imprinted wax (MIW) could be dissolved in n-hexane or melted by heating for subsequent fluorescence and mass spectrum analysis without the target elution process. Moreover, the melted MIW exhibited high repeatability, sensitivity and specificity for solid-state fluorescence detection. We believe that the imprinting method presented in this study will open a new window in analytical chemistry.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
·
2023
·Vol. 13
·期 9
·1531
·
IF 3.4
Jie Pang,Wenfeng Qin,Wentao You,Mian Zhong,Qing’an Meng
Ice accumulation on the surface of aircraft is a serious threat to flight safety and a fatal factor causing air accidents. However, traditional aircraft deicing methods no longer meet the requirements of safe flight due to changes in aircraft structural materials. In recent years, the application of carbon fiber-reinforced polymer (CFRP) materials in the aviation structure industry has increased. In this study, we demonstrate an economical, easy-to-prepare, and pollution-free approach to deice an aircraft through induction heating. The nickel-coated carbon fiber-reinforced polymer used as the induction heater for aircraft deicing is obtained by electroless nickel plating on the surface of the CFRP. The result shows that it takes just 110 s to achieve a temperature of 205 °C on the nickel-plated CFRP when the input voltage is 30 V, as well as melting the ice layer with a thickness of 30 mm, while the temperature of this material can reach up to 81 °C by electric heating when the input voltage is 1.5 V. Meanwhile, the nickel-plated CFRP exhibits good repeatability during the induction heating. Based on the excellent electrothermal properties, the nickel-plated CFRP polymer shows a prominent deicing ability, which provides a promising strategy for the deicing of aircraft.
研究领域:
材料科学
·
航空航天工程
✓ 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）