JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Aming Xie,Ronghui Guo,Lipeng Wu,Wei Dong
Developing an effective strategy to regulate the interfacial properties of hierarchical structure is of great significance for preparation of high-performance electromagnetic wave absorption (EMA) materials. Ion-substitution can change intrinsic structure and properties of a materials, but its effect on the interfacial properties of hierarchical structure remained to be explored. Herein, we first constructed a C@MoS 2 hierarchical structure via simple hydrothermal reaction , then used the ion-substitution strategy to replace the S atoms in MoS 2 with O, F and Se, and finally obtained anion-substituted hierarchical structure (C@X-MoS 2 , X = O, F, Se). The results show that ion-substitution destroys the MoS 2 crystal structure and realizes tunable dielectric properties of C@MoS 2 , which leads to further enhancement of overall interfacial polarization. After optimization, the absorption strength and width of C@O-MoS 2 has been significantly improved. The minimum reflection loss (RL min ) reaches −62.17 dB, and the maximum effective absorption bandwidth (EAB max ) is 7.0 GHz. The simulation results show the obtained absorbent can greatly reduce the radar cross section of target, indicating it has broad application potential. Therefore, this work provides a novel method for regulation of EMA performance of hierarchical structure and preparation of high-performance absorbents.
研究领域:
材料科学
·
电磁学
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Zhaoying Guo,Qi Wang,Tao Shen,Xianjie Hou,Jianlei Kuang,Wenxiu Liu,Wenbin Cao
A novel CQDs/TiO 2 hierarchical structure with enhanced photocatalytic properties was achieved by uniformly decorating urchin-like and yolk-shell TiO 2 microspheres (UYTMs) with carbon quantum dots (CQDs) through an environmentally friendly hydrothermal process. The CQDs were firstly synthesized by the electrochemical method, and the TEM, Raman and PL characterizations strongly indicated that the as-prepared CQDs exhibited good dispersion, high crystallinity and unique up-conversion properties. The UYTMs synthesized by a NaOH-assisted hydrothermal process showed stable 3D hierarchical structure and large surface area, which was beneficial for light absorption and contacting with contamination. The good combination of CQDs and UYTMs was further successfully achieved during the hydrothermal process, and demonstrated by a series of tests. The photocatalytic experiments suggested that the CQDs/UYTMs exhibited better photocatalytic activities than the pure UYTMs and P25 under both visible and UV light irradiation. The CQDs/UYTMs combining with 6 wt% of CQDs showed the best photocatalytic efficiency, while excessive CQDs tended to inhibit the photocatalytic activity. According to the results and discussions, a possible mechanism in improving the photocatalytic efficiency of the CQDs/UYTMs is significantly proposed. The up-conversion property of CQDs can broaden the absorption spectrum of CQDs/UYTMs to the visible light. Moreover, the CQDs, as the electron reservoirs, are efficient to separate the electrons and holes, leading to an improved photocatalytic activity of CQDs/UYTMs.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 44
·期 4
·1194-1203
·
IF 3.069
Can Huang,Fengyi Wang,Daheng Wang,Zhiguang Guo
In this study, superamphiphobic coatings, which could repel liquids with a surface tension as low as 21.6 mN m−1 (n-octane), were prepared using a spray-coating method based on a flower-like hierarchical structure and highly fluorinated TiO2/SiO2 composite particles. And the coating exhibited broad liquid repellency to water-based composites, various oils, organic solvents and hot water. Moreover, the coating also possessed remarkable mechanical and chemical stability towards various forms of mechanical damage and in harsh chemical environments. Multiple features enable the coating to find more vital applications in antifouling, corrosion resistant, fuel transportation, gas adsorption, and protective coatings, etc.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Zhenjie Liu,Yue Zhang,Yudai Huang,Xingchao Wang,Juan Ding,Yong Guo,Xincun Tang
Hierarchical lithium titanate@erbium oxide (Li 4 Ti 5 O 12 @Er 2 O 3 ) microspheres from coating to doping were successfully synthesised by a simple and scalable one-step co-precipitation method. Microscopic observations revealed that the Li 4 Ti 5 O 12 @Er 2 O 3 microspheres present a well-defined hierarchical structure and that Li 4 Ti 5 O 12 is coated by the Er 2 O 3 layer. The X-ray photoelectron spectroscopy (XPS) results demonstrate that partial Ti 4+ is reduced to Ti 3+ and induces oxygen vacancy because partial Er 3+ dope into octahedral 16d Li + /Ti 4+ sites of Li 4 Ti 5 O 12 . Owing to the hierarchical microsphere structure, Er 2 O 3 coating, and Er 3+ doping, the material exhibits excess rate capacity (183.7 mAh g −1 at 30C). The hierarchical microsphere structure shortens the diffusion pathways for Li + ions. The Er 2 O 3 coating on the surface reduces the adverse interface reaction . Importantly, oxygen vacancy induced by Er 3+ doping enhances Li + ion diffusion kinetics and offers extra space to store Li + ions, which endows this sample with excess rate capacity.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
固态化学
✓ 已验证
DOI
高影响因子
Microsystems & Nanoengineering
·
2023
·Vol. 9
·期 1
·1-12
·
IF 7.9
Xu Zhenjin,Wu Dezhi,Chen Zhiwen,Wang Zhongbao,Cao Cong,Shao Xiangyu,Zhou Gang,Zhang Shaohua,Wang Lingyun,Sun Daoheng
The tactile pressure sensor is of great significance in flexible electronics, but sensitivity customization over the required working range with high linearity still remains a critical challenge. Despite numerous efforts to achieve high sensitivity and a wide working range, most sensitive microstructures tend to be obtained only by inverting naturally existing templates without rational design based on fundamental contact principles or models for piezoresistive pressure sensors. Here, a positive design strategy with a hyperelastic model and a Hertzian contact model for comparison was proposed to develop a flexible pressure sensor with highly customizable linear sensitivity and linearity, in which the microstructure distribution was precalculated according to the desired requirement prior to fabrication. As a proof of concept, three flexible pressure sensors exhibited sensitivities of 0.7, 1.0, and 1.3 kPa − 1 over a linear region of up to 200 kPa, with a low sensitivity error (<5%) and high linearity (~0.99), as expected. Based on the superior electromechanical performance of these sensors, potential applications in physiological signal recognition are demonstrated as well, and such a strategy could shed more light on demand-oriented scenarios, including designable working ranges and linear sensitivity for next-generation wearable devices.
研究领域:
柔性电子
·
传感器技术
·
生物医学工程
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Ruixue Yangcheng,Yuntong Cui,Shuang Luo,Jiansu Ran,Jianjian Wang
Developing an efficient and stable catalyst for the aqueous hydrodeoxygenation (HDO) of lignin derivatives at ambient temperature is highly desirable. Here, a novel Pd/PHS catalyst with the hierarchical structure was facilely constructed. Taking HDO of vanillin (VAN, a typical molecule of lignin derivatives) to 2-methoxy-4-methyl phenol (MMP) as a model reaction, >99% VAN conversion and 98.2% MMP yield can be achieved over Pd/PHS at ambient temperature in a water solvent, outperforming the recent works reported in the literature. We found that the hierarchal zeolitic structure could immobilize acidic P species in Pd/PHS via trapping and hydrogen-bonding, and these P species could greatly accelerate the conversion of reaction intermediate, enhancing the yield of MMP product. Pd/PHS also showed excellent activities in HDO of other lignin derivatives. We think this work will provide a new route to guide the design of stable catalyst for the efficient aqueous HDO of lignin derivatives to high value-added chemicals and biofuels at ambient temperature.
研究领域:
催化化学
·
可再生资源化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2016
·Vol. 27
·期 3
·1605011
·
IF 11.382
Yaxiong Yang,Yongfeng Liu,Kaichao Pu,Xing Chen,He Tian,Mingxia Gao,Min Zhu,Hongge Pan
In this study, an amorphous Li 2 CO 3 -coated nanocrystalline α-Fe 2 O 3 hierarchical structure is synthesized for the first time using a facile one-step mechanochemical process at room temperature, taking advantage of the concurrence of repeated fracture-cold welding of material's particles and a gas-solid redox reaction. The conformal coating and hierarchical structure significantly increase the cycling durability and rate capability. Typically, a 1–3 nm thick amorphous Li 2 CO 3 layer is conformally coated on Fe 2 O 3 nanocrystallines (≈10 nm in size) that form hierarchically aggregated particles 400–800 nm in size by ball milling α-Fe 2 O 3 with LiH in CO 2 . The prepared Li 2 CO 3 -coated nanocrystalline α-Fe 2 O 3 exhibits highly stable long-term cyclability as it delivers a reversible capacity of 975 mAh g −1 with 99% of retention after 400 cycles at 100 mA g −1 . At a high rate of 3000 mA g −1 , its reversible capacity still remains at 537 mAh g −1 , superior to the uncoated counterpart (311 mAh g −1 ). Moreover, amorphous Li 2 O and Li 2 CO 3 coatings are also similarly produced on Fe 2 O 3 and NiO nanocrystallines, respectively, representing the general applicability of this mechanochemical approach.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
固态化学
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Ziying Zheng,Keqing Zhou,Changhao Wang,Yulun Zhang,Bin Yu,Sheng Zhang
Epoxy resin (EP) is extensively employed in construction on account of its exceptional comprehensive performance. However, its inherent fire hazards and insufficient mechanical properties pose significant safety issues. In this study, a CPM (CeHPP@PDA@MoS₂) hybrid material with hierarchical architectures was constructed using electrostatically driven self-assembly technology. Following the introduction of 2D rare-earth metal phenylphosphate (CeHPP) into the graphene analogue MoS₂ via PDA surface functionalization, the PDA-induced hierarchical structure effectively mitigated the stacking and re-agglomeration of MoS₂. Moreover, it significantly enhanced the interfacial adhesion between MoS₂ and EP, thus leading to notable improvements in the thermal stability, flame retardancy, and mechanical performance of EP composites. Relative to pure EP, the peak heat release rate (PHRR), total heat release (THR), peak smoke production rate (PSPR), and total smoke production (TSP) of the EP/CPM 2.0 composite showed marked decreases, by 46.6 %, 21.1 %, 39.8 %, and 45.4 %, respectively. Furthermore, the char yield of the EP composites demonstrated a growth to 25 %, up from an initial 7 %. The flexural and tensile strengths of the EP/CPM 2.0 composites were reinforced by 40.8 % and 31.6 %, respectively. The flame retardant and mechanical reinforcement mechanisms were explored. This research identifies a novel methodological avenue for engineering high-performance epoxy composites.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Qijiao Jiang,Guangfa Wu,Xiaobao Gong,Xianfeng Wang,Jing Zhao
Integrating efficient passive daytime radiative cooling with superior waterproof and breathable performance within a single durable material system remains a critical challenge for developing all-weather protective and energy-saving materials. Here, we report an innovative and scalable strategy that synergistically combines nonsolvent-induced phase separation and electrospraying to construct hierarchically structured poly(vinylidene fluoride-co-hexafluoropropylene)/silica composite membranes. This hierarchical architecture strategically employs an interconnected microporous network to facilitate efficient water vapor transport while utilizing a nanoparticle-induced hierarchical surface to simultaneously enhance solar scattering and hydrophobicity. As a result, the film provides exceptional radiative cooling, achieving an approximately 7.4 °C temperature reduction attributed to a high solar reflectance of 96.1 % and an infrared emissivity of 92.5 %, while also offering superior waterproofness of 61 kPa and breathability of 4.57 kg·m −2 ·d −1 . More importantly, the film exhibits remarkable chemical durability under extreme acidic/alkaline conditions (pH 1–13). This structure-function matched design provides a versatile and industrially viable pathway for developing next-generation multifunctional materials with broad applications in personal thermal management, energy-efficient buildings, and outdoor protective equipment.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）