MATERIALS & DESIGN
·
2016
·
IF 3.997
Qiang Wang,Bing Dai,Jie Bai,Zhenhuai Yang,Shuai Guo,Yujie Ding,Lei Yang,Pei Lei,Jiecai Han,Jiaqi Zhu
A simple and efficient strategy is introduced for fabricating a layer of superhydrophobic and superoleophilic membrane on the surface of porous materials by self-assembly, and it is of great interest for the new type separation of oil and water. It is realized in this study by synthesizing an array of vertically aligned composite microcones on the surface of nickel foam by microwave plasma assisted chemical vapor deposition . The hierarchical structure, high aspect ratio , and dual-scale pine tree-like nature of the microcones formed on the nickel foam, which has microscale pores, in combination with the low surface energy of carbon, amplify both the hydrophobicity and the oleophilicity of the membrane. In addition, the membrane exhibits pH-responsivity, and the controllable water permeation can be realized by simply altering the water pH. Given its extremely high hydrophobicity and oleophilicity as well as outstanding mechanical durability, the composite frame can be used as a filter to separate oil/water mixtures and as an intelligent sponge to purify oil-contaminated water with excellent separation efficiency and absorption capacity . It should also be ideal for real world use in various environmental and chemical separation processes.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Jiajun Yang,Guang Liu,Kaiteng Zhang,Ping Li,Haipeng Yan,Yu Yan,Yingdong Zheng,Zehui Zhao,Liwen Zhang,Xiaolin Liu,Guang Yang,Huawei Chen
Precisely controlling the directional motion trajectories of droplets on anisotropic 3D functional surfaces has great application potential in self-cleaning, drug delivery, and droplet power generation, but it also faces huge challenges. Herein, inspired by the microcone structure in the heart of sunflowers, a nanoneedle-modified microcone array surface (NMAS) is reported. The surface is created using a combination of nanosecond laser direct engraving and electroforming and is subsequently fluorinated. Through programmable control of the laser spot, the geometric parameters and inclination angle of the microcone can be quickly and finely adjusted, thereby achieving precise control of the droplet bouncing trajectory. The results show that droplets can achieve programmable multiple bouncing behaviors on patterned functional surfaces, including gravity-defying hopping and directional water transport. It is worth noting that this functional surface has delayed freezing and anti-freezing effects. Furthermore, this functional surface has a wide range of potential applications, including surface self-cleaning, droplet capture, and droplet-based chemical microreactions, especially in the field of anti-icing operations. This opens up a new way for the directional transport of droplets on biomimetic functional surfaces.
研究领域:
材料科学
·
仿生学
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Fan Zhang,Renjie Ji,Yonghong Liu,Yuan Pan,Baoping Cai,Zhijian Li,Zheng Liu,Shuaichen Lu,Yating Wang,Hui Jin,Chi Ma,Xinlei Wu
Hydrogen production is the key to the development and utilization of hydrogen energy. In this paper, we find a new phenomenon in which abundant and uniform bubbles evolve and quickly release during water splitting on the surface of a nickel-based honeycomb electrode with microtapered holes (NHEMH). Benefiting from the unique microtapered hole honeycomb structure, the solution circulation on the surface of NHEMH is accelerated, thus generating a dynamically stabilized reactive interface and improving the ionic/mass exchange. Meanwhile, the unique honeycomb skeleton has good hydrophilicity and aerophobic properties. Furthermore, NHEMH with a large surface area, rich multi-vacancies, and highly conductive nickel metal exhibits an outstanding electrocatalytic ability. P-doped NHEMH (PNHEMH) with the Ni 2 P/NiO heterointerface decorated by multivacancies, when used as an electrolyzer for overall water splitting, requires only 1.52 V to produce a current density of 10 mA/cm 2 , which is much better than the performance of benchmark Pt/C//IrO 2 electrodes.
研究领域:
材料科学
·
能源研究
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Qiang Wang,Lei Yang,Bing Dai,Jie Bai,Zhenhuai Yang,Shuai Guo,Yurong He,Jiecai Han,Jiaqi Zhu
Forests of vertically aligned carbonaceous microcones are fabricated directly on a nickel mesh by microwave-plasma-assisted chemical vapor deposition. The microstructure is formed through a simple one-step process involving self-assembly. The fabricated composite exhibits superhydrophobicity and superoleophilicity as well as low density, owing to which it floats on water and can be used for the in-situ separation of oil from water at the oil/water interface. Furthermore, the composite exhibits pH responsivity, and its water permeability can be varied simply by altering the pH of the aqueous solution. In addition, the composite is suitable for use as an electrode material for supercapacitors owing to its large geometric surface area, porous structure, and superior electrical properties, which allow for fast ion and electron transportation. Thus, this composite consisting of forests of vertically aligned carbonaceous microcones on a nickel mesh is expected to find use in a wide range of fields and applications, including in environmental cleanup, flow switches, and energy storage devices.
研究领域:
材料科学
·
环境科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Chuanzong Li,Yunlong Jiao,Xiaodong Lv,Sizhu Wu,Chao Chen,Yiyuan Zhang,Jiawen Li,Yanlei Hu,Dong Wu,Jiaru Chu
Shape memory polymer (SMP) surfaces with tunable wettability have attracted extensive attention due to their widespread applications. However, there have been rare reports on in situ tuning wettability with SMP materials. In this paper, we reported a kind of distinct superhydrophobic SMP microconed surface on the silver nanowire (AgNW) film to achieve in situ reversible transition between pinned and roll-down states. The mechanism is taking advantage of the in situ heating functionality of the silver nanowire film by voltage, which provides the transition energy for SMP to achieve the fixation and recovery of temporary shape. It is noteworthy that the reversible transition could be repeated many times (>100 cycles), and we quantitatively investigate the shape memory ability of microcones with varied height and space under different applied voltages. These results show that the tilted microcones could recover its original upright state under a small voltage (4–11 V) in a short time, and the shortest recovery time is about 0.5 min under an applied voltage of ∼10 V. Finally, we utilize SMP microcone arrays with tunable wettability to realize lossless droplet transportation, and the tilted microconed surface also achieves liquid unidirectional transport due to its anisotropic water adhesion force. The robust microconed SMP surface with reversible morphology transitions will have far-ranging applications including droplet manipulation, reprogrammable fog harvesting, and so on.
研究领域:
材料科学
·
表面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2022
·Vol. 18
·期 25
·2202400
·
IF 15.153
Zhenmin Ding,Lorenzo Pattelli,Hongbo Xu,Wenhai Sun,Xin Li,Lei Pan,Jiupeng Zhao,Chengyu Wang,Xiang Zhang,Ying Song,Jun Qiu,Yao Li,Ronggui Yang
Coatings for passive radiative cooling applications must be highly reflected in the solar spectrum, and thus can hardly support any coloration without losing their functionality. In this work, a colorful daytime radiative cooling surface based on structural coloration is reported. A designed radiative cooler with a bioinspired array of truncated SiO 2 microcones is manufactured via a self-assembly method and reactive ion etching. Complemented with a silver reflector, the radiative cooler exhibits broadband iridescent coloration due to the scattering induced by the truncated microcone array while maintaining an average reflectance of 95% in the solar spectrum and a high thermal emissivity (ε) of 0.95, owing to the reduced impedance mismatch provided by the patterned surface at infrared wavelengths, reaching an estimated cooling power of ≈143 W m –2 at an ambient temperature of 25 °C and a measured average temperature drop of 7.1 °C under direct sunlight. This strong cooling performance is attributed to its bioinspired surface pattern, which promotes both the aesthetics and cooling capacity of the daytime radiative cooler.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 27
·期 2
·1033-1042
·
IF 3.917
Zang Limin,Qiao Xuan,Liu Qifan,Yang Chao,Hu Lei,Yang Jun,Ma Zihan
Abstract From the viewpoint of developing low-cost, eco-friendly and flexible energy storage devices, the used newspaper that consists of interconnected cellulose fibers was served as flexible substrate to fabricate solid-state supercapacitors. Graphite current collectors with desired patterns were directly coated on the used newspaper by pencil drawing and then three dimensional interconnected polypyrrole nano/microcones were electrochemically deposited on them, forming the newspaper-based graphite–PPy nano/microcones (NGP) electrodes. The effect of deposition time on the morphology and electrochemical properties of the NGP electrodes was investigated. The NGP electrode that obtained by electrochemical polymerization of pyrrole for 120 min showed a high specific capacitance of 1122 mF cm −2 (1 mA cm −2 ). Solid-state supercapacitors based on NGP electrodes with a sandwich structure and in-plane interdigital structure were fabricated, which exhibited excellent specific capacitance, energy density, power density, flexibility and voltage/current scalability. Other electrodes/supercapacitors with designable patterns also can be obtained by this simple method. These results indicate the NGP-based supercapacitors are promising in diverse portable and flexible electronics. Graphic abstract
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
IEEE SENSORS JOURNAL
·
2025
·
IF 4.5
Tao Lv,ZeWen Li,ChunYu Lv,XinYu Zhang,Ye Li,Mengying Xie
Flexible sensors with a single tactile sensing function have been extensively studied, however, the development of highly sensitive multifunctional sensors remains a significant challenge in the realm of wearable technology. In this paper, a multifunctional flexible capacitive sensor with integrated proximity, pressure and temperature perception is developed. The dielectric layer of the sensor is obtained by spontaneous polymerization of polyvinyl alcohol and the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide at room temperature. The electrode structure is optimized by leveraging the capacitive fringing field effect, and the designed hole-circle shaped 4 × 4 electrode array achieves optimal proximity sensitivity with a maximal capacitance drop of 0.54 pF to human hand and a detection distance of 30 mm. Besides, the prepared microcone structure sensor exhibits high pressure sensitivity of 4.822 kPa-1(0-5 kPa), rapid response time (<100 ms), a broad detection range (~200 kPa), and excellent stability over 3000 cycles of loading/unloading tests. By exploiting the temperature dependence of the ionic liquid, the sensor also exhibits high temperature sensitivity of 80.6%°C-1(25-80°C). Finally, we verified the successful application of this sensor in dynamic finger trajectory recognition, multi-touch and robotic grasping state detection, paving the way for its use in artificial intelligence, healthcare, and intelligent robotics.
研究领域:
材料科学
·
传感器技术
·
可穿戴电子器件
·
人工智能
·
机器人技术
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Hongsen Niu,Yuke Chen,Eun-Seong Kim,Weijia Zhou,Yang Li,Nam-Young Kim
The development of capacitive tactile sensors with both ultrasensitivity and ultrafast response/relaxation is crucial for the development of intelligent healthcare monitoring technology. Despite the significant improvement in the sensing performance presented by the introduction of microstructures into the dielectric or electrode layers, meeting the demands of intellectualization remains a major challenge. Herein, a strategy to simultaneously introduce microstructures in both the dielectric and electrode layers is developed. The hierarchical sea-urchin TiO 2 particle-in-micropore (HSP-MP) structure in the dielectric layer induces stress concentration near the micropore regions, significantly enhancing the sensitivity and toughness of the device. The sparsely spaced large microcone improves the sensitivity of the hierarchical microcone (HM) structure in the electrode layer, while the small microcone reduces the hysteresis caused by interfacial adhesion. With the synergistic effect of the HSP-MP&HM structure, the proposed tactile sensor achieves ultrasensitivity of 10.5 kPa −1 , ultrafast response/relaxation time of 5.6/5.6 ms, and ultralow limit of detection of 0.1 Pa. These sensing properties are demonstrated in practical applications, including tiny signal perception of the human fingertip pulse, tiny muscle motion perception for Morse code transmission, and high-resolution flexible perception array with pressure mapping capability.
研究领域:
智能医疗监测技术
·
传感器与执行器
·
微纳制造
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Zhixin Wang,Yuanpeng Fu,Tianzhao Bu,Yuqi Qiu,Bo Pang,Qingyang Zheng,Sen Zhou,Yangyang Li,Xiling Xiao,Zhouping Yin,Hao Wu
Quantitative and objective assessment of muscle spasticity grades in post-stroke patients plays a pivotal role for physicians and patients in adjusting rehabilitation plans and preventing secondary complications. However, the development of such methods for spasticity detection and assessment is hindered by the subjectivity of conventional assessment methods, the limited clinical applicability of digital-devices, and the structural complexity of sensors used for monitoring muscle strength. Here, a multimodal on-skin sensor is developed, enabling simultaneous acquisition of surface electromyography (sEMG) and triboelectric signals, through wavelet analysis, the signal from the sensor can comprehensively reflect the bioelectrical and biomechanical characteristics of human motion. The high-performance triboelectric materials (BPA NPs) with metal-organic–inorganic core-shell structures are synthesized to enhance the signal quality of the multimodal on-skin sensor by leveraging the self-polymerization ability and weak reducibility of dopamine. The sensitivity of the multimodal on-skin sensor is improved by designing a radially arranged micro-cone array with gradient heights. Additionally, a quantitative spasticity assessment strategy is developed by integrating muscle co-activation coefficients (Index 1) and antagonistic efficacy metrics (Index 2), which are strongly correlated with the Modified Ashworth Scale scores. The multimodal on-skin sensor with the proposed assessment strategy enables quantitative assessment of spasticity in 9 spasticity patients.
研究领域:
生物医学工程
·
可穿戴传感器
·
神经康复
·
信号处理
·
智能材料
✓ 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）