ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 35
·1803117
·
IF 13.325
Qian Zhang,Qijie Liang,Qingliang Liao,Mingyuan Ma,Fangfang Gao,Xuan Zhao,Yiding Song,Lijuan Song,Xiaochen Xun,Yue Zhang
Raindrop falling, which is one kind of water motions, contains large amount of mechanical energy. However, harvesting energy from the falling raindrop to drive electronics continuously is not commonly investigated. Therefore, a self-cleaning/charging power system (SPS) is reported, which can be exploited to convert and store energy from falling raindrop directly for providing a stable and durable output. The SPS consists of a hydraulic triboelectric nanogenerator (H-TENG) and several embedded fiber supercapacitors. The surface of H-TENG is amphiphobic, enabling the SPS self-cleaning. The fiber supercapacitor which uses α-Fe 2 O 3 /reduced graphene oxide composite possesses remarkable specific capacitance, excellent electrical stability, and high flexibility. These properties of the fiber supercapacitor make it suitable for a wearable power system. A power raincoat based on the SPS is demonstrated as application. After showering by water flow, which simulates falling raindrops, for 100 s, the power raincoat achieves an open-circuit voltage of 4 V and lights a light-emitting diode for more than 300 s. With features of low cost, easy installation, and good flexibility, the SPS harvesting energy from the falling raindrop renders as a promising sustainable power source for wearable and portable electronics.
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高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Ming-xi Wang,Hong-yan Deng,Wen-bin Li,Jiang-ming Ouyang,Zi-shan Lu,Zhi-qiang Zhang
The remediation of contaminated soil by invasive plant resources is a new research hotspot. Different proportions (0%, 1%, 2%, 5%, and 10%) of exudates (E) from the living roots (LR-E), dead roots (DR-E), and fallen leaves (FL-E) of the invasive plant Alternanthera philoxeroides were added to a tetracycline (TC) adsorption system to study the influence of extracts from invasive plant roots and litter (fallen leaves and dead roots) on the adsorption of TC by clays (bentonite [B] and kaolin [K]). Then, the batch method was used to study the isotherm adsorption characteristics of TC, and the effects of temperature, pH, and ionic strength on TC adsorption were compared. The following results were obtained: (1) The adsorption isotherms of TC on B and K under the coexistence of E were all consistent with the Henry model, and the adsorption amount of TC increased by 1.04–1.81 times after the addition of E. The addition of LR-E had a strong promoting effect on TC adsorption by the two clays. (2) The adsorption amount of TC on each tested clay with the coexistence of E was positively correlated with temperature within the range of 5°C–40°C. Thermodynamic analysis showed that TC adsorption was a spontaneous, endothermic, and entropy-adding reaction. (3) When the pH was changed from 2 to 10, the adsorption amount of TC on clay decreased. The range of this decrement narrowed with the increase in coexisting E. (4) When the ion concentration was changed from 0.01 to 0.5 mol/L, the adsorption amount of TC on B decreased with the increase in ionic strength, whereas that on K first increased and then decreased. In conclusion, invasive plant extracts can improve the adsorption of TC on clay, and the adsorption effect is superior when the temperature is high and the pH is low.
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高影响因子
Science China-Materials
·
2024
·Vol. 67
·期 4
·1332-1339
·
IF 6.8
Zhang Shunyao,Wang Lukai,Feng Junzong,Jiang Yonggang,Li Liangjun,Hu Yijie,Feng Jian
Silica aerogels exhibit considerable potential for thermal insulation applications owing to their low thermal conductivity. However, they generally possess poor mechanical properties and need to be mechanically enhanced while maintaining their low thermal conductivity. In this study, commercial fumed silica and methyltrimethoxysilane were used as the silica sources and water and ethanol were used as solvents to form a slurry. Consequently, silica aerogel monoliths (SAMs) were prepared through ambient drying without additional surface modification or solvent replacement. The resulting SAM maintained a typical nanopore structure and exhibited low density (0.24 g cm −3 ), shrinkage (4%), and thermal conductivity (0.046 W m −1 K −1 ). The slurry was impregnated with fiber blankets via roller pressing, and silica aerogel blankets (SABs) were prepared through thermal solidification of the slurry and ambient drying. The prepared SABs exhibited good flexibility and mechanical properties, facilitating their installation and application for thermal insulation and considerably reducing production cycles and costs. In addition, controlling the particle size and mass fraction of opacifiers decreased the high-temperature thermal conductivities of SABs owing to the nanopore structure and low shrinkage of SAMs, and the thermal conductivity of the optimized SAB at 800°C was as low as 0.054 W m −1 K −1 .
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高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2024
·Vol. 121
·期 51
·e2416835121
·
IF 9.4
Hui Luo,Hongli Xuan,Dong Wang,Ziwan Du,Zhongyang Li,Kejun Bu,Songhao Guo,Yuhong Mao,Fujun Lan,Fuyang Liu,Yanfeng Yin,Wenming Tian,Qingyang Hu,Gang Liu,Haozhe Liu,Qiaoshi Zeng,Yang Ding,Yongping Fu,Qian Li,Shengye Jin,Wenge Yang,Ho-Kwang Mao,Xujie Lü
High pressure can create extreme conditions that enable the formation of novel materials and the discovery of new phenomena. However, the ability to preserve the desirable characteristics of materials obtained under high pressure has remained an elusive challenge, as the pressure-induced changes are typically reversible, except for the pressure-induced chemical reactions such as polymerization of hydrocarbons. Here, we propose the concept of “pressure aging” (PA) that enables the permanent locking-in of high-pressure structures and their associated enhanced properties in functional materials. Specifically, through the application of PA at 3.3 GPa for 24 h, the two-dimensional ferroelectric CuInP2S6 exhibits a permanent change in Cu configuration after the pressure is fully released. This leads to a 2.5-fold enhancement in remanent polarization and an increase in Tc from 317 K to 583 K. In contrast, the samples underwent a compression–decompression cycle but without PA showed only reversible changes in their characteristics. We elucidate the relaxation dynamics during PA using the Kohlrausch–Williams–Watts function, providing valuable insights into the temporal evolution of both structural and property changes. Furthermore, the broad applicability of PA strategy has been validated across different materials, underscoring its versatility. Notably, the pressures involved are industrially attainable, and the sample sizes are scalable. Consequently, the implementation of this impactful PA approach introduces a groundbreaking unique dimension to high-pressure research, with significant potential across various scientific domains.
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高影响因子
DALTON TRANSACTIONS
·
2016
·Vol. 45
·期 16
·7042-7048
·
IF 4.177
Jiasheng Wang,Shumin Han,Zhibin Wang,Dandan Ke,Jingjing Liu,Mingzhen Ma
The 2LiBH4–MgH2 + 20 wt% BaTiO3 composite was prepared by ball-milling LiBH4, MgH2 and BaTiO3, and the effect of BaTiO3 on the hydrogen storage properties of the composite was investigated. TG-DSC results show that the onset dehydrogenation temperature of the composite is 299 °C, which is 124 °C lower than that of 2LiBH4–MgH2, and the dehydrogenation amount of the composite increases from 6.86 wt% to 7.48 wt% at 500 °C. Kinetic tests show that the dehydrogenation amount of 2LiBH4–MgH2 + 20 wt% BaTiO3 reaches 1.5 wt% within 400 seconds, almost 10 times that of 2LiBH4–MgH2. BaTiO3 reacts with LiBH4 during the dehydrogenation of the composite and generates BaB6 and TiO2. BaB6 is beneficial to lower the stability of LiBH4, while TiO2 has a catalytic effect in improving the hydrogenation/dehydrogenation kinetics of the reaction between Mg and LiBH4.
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高影响因子
Nanoscale
·
2021
·Vol. 14
·期 3
·675-679
·
IF 7.79
Zhangran Gao,Yuying Wu,Shulin Jiao,Zheng Tang,Xiaofan Sun,Dong Li,Hong-Ling Cai,X. S. Wu
Solid-state crystals with two distinct dielectric states can be a physical practice in binary-based technologies. A large dielectric switch effect up to 103 caused by an order–disorder structural phase transition is found in cyclopropylamine perchlorate (CPA-ClO4) crystals at temperatures around 230 K (Tc) and 220 K (T′c). Large dielectric switch effects here can be compared to that of the famous ceramic oxide dielectrics. As far as we know, this is the highest dielectric switch effect in simple organic salt crystals and organic–metal compounds so far. If the phase transition temperature can be adjusted by molecular manipulation, one of the most promising candidates for technological applications may emerge in the future.
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高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 25
·6063-6069
·
IF 5.066
C. R. Ma,J. H. Yan,P. Liu,Y. M. Wei,G. W. Yang
Nonlinear optical (NLO) nanostructures have played important roles in frequency conversion, optical switching, information storage and biomedical imaging. Although previous designs have focused on photonic crystals and metal plasmonic nanostructures, complex structure, large ohmic loss and Joule heating greatly hinder their practical applications. Beyond photonic crystals and metal plasmonic nanostructures, all-dielectric materials (ADMs) bring new ways to generate NLO behavior at subwavelength scales. We, for the first time to our knowledge, demonstrate irregular-geometry induced second harmonic generation (SHG) enhancement from an individual all-dielectric SiC nanoparticle. SHG conversion efficiency of single irregular-geometry SiC nanoparticles increases to 10−5 under an average excitation power of 6 mW at 880 nm excitation, thirtyfold higher than that of SiC nanosphere. We also establish that not only electric dipole mode but also magnetic dipole mode can exist in the vicinity of nanoparticles in mid-refractive (2 < n < 3) ADMs, and the stronger enhancement of the magnetic response induced by the irregular-geometry makes a great contribution to the SHG enhancement. A modified formula that includes electric and magnetic contributions is proposed to predict the SHG enhancement from ADMs. This discovery makes geometry-tuning all-dielectric nanoparticles promising in NLO nanostructures of nanophotonics in the future.
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高影响因子
THIN SOLID FILMS
·
2013
·
IF 1.604
Mi Wang,Yanfeng Gao,Zhang Chen,Chuanxiang Cao,Jiadong Zhou,Lei Dai,Xuhong Guo
High-quality transparent and conductive tungsten-doped tin oxide (SnO 2 :W) thin films with different thickness (from 60 to 600 ± 10 nm) were fabricated on quartz glass substrates by a solution-based method. A stable solution was prepared from tin chloride and ammonium tungstate together with polyvinyl alcohol as a film-forming promoter. It was found that all films showed homogeneous composition, smooth surface with no cracks and high transparency with the optical band gap ranging from 3.93 to 4.31 eV. The effect of tungsten concentration, spin rate and annealing temperature on the morphological, electrical and optical properties of the films has been investigated. W doping has a large influence on the microstructure and the conductivity of the SnO 2 thin films . The lowest resistivity of 2.8 × 10 − 3 Ω · cm was obtained for a SnO 2 : 3 at% W film, which was prepared at 3000 rpm and annealed at 800 °C in air. An eight-layer film with a sheet resistance of 60 Ω/□ and a thickness of 606 nm could be fabricated by multiple coating operation, which still exhibited an optical transmittance of over 80% in the visible region from 400 to 700 nm.
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高影响因子
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
·
2022
·
IF 5.168
Yingrui Bai,Liyao Dai,Jinsheng Sun,Kaihe Lv,Qitao Zhang,Xiaosen Shang,Yuecheng Zhu,Chengtong Liu
Considerable lost circulation of oil-based drilling fluid often occurs because of pores and fractures that develop in formations, which can significantly increase drilling costs. In this study, we prepared a ternary composite self-swelling oil-absorbing resin and investigated the synthesis conditions on its oil-absorption properties. The resin molecular structure and properties were characterized by infrared spectroscopy, thermal stability, and scanning electron microscope , and we subsequently analyzed the fracture plugging mechanism of the resin. The results indicated that when the content ratio of butyl acrylate and stearyl methacrylate was 2:1, the sodium-p-styrenesulfonate content was 1%, the initiator content was 0.3%, and the cross-linker dosage was 0.16%, the resin exhibited good toughness and oil-swelling performance. The unsaturated groups in the copolymer were grafted, forming a three-dimensional network structure. At 120 °C, composite resin particles were used to seal fractures with width of 1–3 mm, with the pressure bearing capacity reaching 4.7 MPa. The fracture was compacted and sealed through deformation, compaction, and filling. Compared to conventional lost circulation materials, the oil-absorbing resin exhibited good thermal stability and self-adaptability, and could easily enter pores and micro-fractures, effectively reducing lost circulation of the oil-based drilling fluid.
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高影响因子
Frontiers in Genetics
·
2022
·
IF 4.772
Liexi Xu,Zhengrong Huang,Zihang Zeng,Jiali Li,Hongxin Xie,Conghua Xie
Background: Abnormal DNA methylation of gene promoters is an important feature in lung adenocarcinoma (LUAD). However, the prognostic value of DNA methylation remains to be further explored. Objectives. We sought to explore DNA methylation characteristics and develop a quantifiable criterion related to DNA methylation to improve survival prediction for LUAD patients.Methods: Illumina Human Methylation450K array data, level 3 RNA-seq data and corresponding clinical information were obtained from TCGA. Cox regression analysis and the Akaike information criterion were used to construct the best-prognosis methylation signature. Receiver operating characteristic curve analysis was used to validate the prognostic ability of the DNA methylation-related feature score. qPCR was used to measure the transcription levels of the identified genes upon methylation.Results: We identified a set of DNA methylation features composed of 11 genes (MYEOV, KCNU1, SLC27A6, NEUROD4, HMGB4, TACR3, GABRA5, TRPM8, NLRP13, EDN3 and SLC34A1). The feature score, calculated based on DNA methylation features, was independent of tumor recurrence and TNM stage in predicting overall survival. Of note, the combination of this feature score and TNM stage provided a better overall survival prediction than either of them individually. The transcription levels of all the hypermethylated genes were significantly increased after demethylation, and the expression levels of 3 hypomethylated proteins were significantly higher in tumor tissues than in normal tissues, as indicated by immunohistochemistry data from the Human Protein Atlas. Our results suggested that these identified genes with prognostic features were regulated by DNA methylation of their promoters.Conclusion: Our studies demonstrated the potential application of DNA methylation markers in the prognosis of LUAD.
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高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 19
·11424-11438
·
IF 10.7
Siyuan Chen,Yanhong Wang,Shuanshi Fan,Xuemei Lang,Gang Li
Hydrate-based hydrogen storage is considered one of the most promising hydrogen storage technologies, but its slow formation kinetics impedes its applicability. In this study, a novel method to enhance hydrate nucleation and hydrate growth was proposed. Ultra-rapid and high hydrogen storage was achieved by the new method of quasi-simultaneous formation (q-SF) of propane–hydrogen hydrates. And different kinetic hydrate additives (KHAs) were introduced to enhance the kinetics of hydrate formation. The results demonstrated that this method implemented the transition of progressive nucleation to instantaneous nucleation of hydrogen hydrate, with the enhancing growth kinetics of hydrate. In the study of KHAs, sodium dodecyl sulfate (SDS) had a significant promoting effect on propane–hydrogen hydrate growth, and high-concentration SDS could achieve higher water-to-hydrate conversion. The maximum hydrogen uptake was 67.50 cm3 cm−3 hydrate (0.628 wt%) at 274.15 K and the initial pressure of 18.2 MPa with a system of 0.1 wt% SDS coupled with stirring. The time from hydrate nucleation to the maximum hydrogen uptake of 90% (t90) was only 21 min, and the average hydrate growth rate was 289.28 × 10−2 cm3 cm−3 hydrate·min−1. As far as we know, this is the fastest hydrate growth rate among hydrate-based hydrogen storage technologies so far. A mechanism was proposed to explain the promoting effect of q-SF on hydrate formation kinetics. This work provides unique insights into enhancing the kinetics of hydrogen hydrates, which would contribute to the further development of hydrate-based hydrogen storage technologies.
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高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 23
·13818-13829
·
IF 10.7
Wenrui Wu,Yue Yan,Xing Wang,Chengzhi Wei,Yang,Tao Xu,Xianfu Li
Transition metal selenides and sulfides have attracted much attention as supercapacitor electrode materials, and reasonable construction and modification strategies can effectively improve their actual energy storage capacity. Herein, a CuCoSe@NiS/NF electrode material was optimized from the two dimensions of the material structure and microstructure using a self-supported bimetallic CuCo-MOF template and surface modification. The in situ growth not only secures the structural integrity of the electrode material but also eliminates the unwanted internal resistance, thereby enhancing the material's conductivity. The distribution of different spaces of the nanosheets greatly increased the specific surface area of the material, which endowed it with sufficient electrochemical active sites, thus obtaining the desired electrochemical performance. The strong electronic interactions between the CuCoSe nanosheets and NiS sheet layers significantly increased the charge transport rate. Consequently, the specific capacitance of the prepared CuCoSe@NiS/NF material reached a satisfactory specific capacitance of 2937.6 F g−1 at 1 A g−1. The assembled asymmetric supercapacitor (ASC) delivers a high energy density of 41.8 W h kg−1 at 800 W kg−1. This work provides insights for the rational construction of sulfur and selenium coexisting composite electrode materials and the optimisation of the electrode structures.
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高影响因子
危险品化学品经营许可证（带存储）