COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Feifeng Hu,Guangyi Tian,Huayang Zhang,Zhiguang Guo
The shortage of freshwater resources has a great impact on the daily life of human beings, and fog collection has become an effective mitigation measure. In this paper, inspired by the nanofabricated desert beetle, honeycomb, Euphorbia antiquorum L. and cactus, a 3D fog collector combining a conical array structural gradient and a wettability gradient was presented, with special three-dimensional array structure (TA-L/B (PPC)) that ensures that the fog-collecting efficiency of the samples is virtually independent of the direction of the fog flow. The fog collection efficiency of sample TA-L/B (PPC) is close to 4.3 g·h −1 ·cm −2 , a value that is 1.77 times higher than the surface fog collection efficiency of the copper sheet (OS) sample. By rationally designing the surface structure of the sample, the fog circulation process is accelerated, and a sustainable and stable fog collection process is achieved.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Huanian Han,Quan Shen,Wenlong Wu,Jingjing Jiao,Long Li,Jiaojing Shao,Tao Zhu,Peng Xu
The treatment of oily wastewater, especially emulsions by membranes attracts growing attention nowadays. However, the handling of industrial oily wastewater, especially emulsions, remains a challenging issue and high flux and efficiency in emulsion separation usually depend on energy-consuming external driving pressure. In this work, we report a functional gradient membrane (GM) with special wettability and structure gradient in the thickness direction for highly efficient emulsion separation. The GM is prepared by a one-step electrospinning strategy using PS-PAN and GO@PAN to tune the wettability of each layer in the membrane following a specially designed fabrication protocol. The prepared GM has a wettability gradient of superhydrophilicity to hydrophobicity and a structure gradient of spindles on fibers caused by GO content variation. The wettability gradient of GM generates remarkable unidirectional liquid transport properties and significantly higher fluxes for emulsion separation than the homogeneous GO@PAN membrane while the GO and the spindles on fibers facilitate the demulsification and coalesce of demulsified oil droplets. As a result, ultrahigh separation flux and efficiency have been obtained in surfactant-free oil-in-water emulsion separation only under gravity and an energy-efficient separation of surfactant-stabilized emulsions under low gravity condition has also been achieved by the GM. In addition, the GO spindle structure in GM makes it present favorable antifouling properties. After several cycles of separation, the emulsion flux can be restored to about 100% of the initial flux after simple cleaning. Thus, the special wettability and structure gradient endows the GM with excellent energy-efficient and stable separation performance, showing tremendous potential in the field of oil–water separation.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
GIANT
·
2024
·
IF 5.4
Jin Huang,Hangsheng Zhou,Li Zhang,Hao Zha,Wei Shi,Tianyi Zhao,Mingjie Liu
Traditional impact-resistance materials relying on the combination of supporting materials and energy-dissipation elastomers can effectively reduce shock load, yet the sharp interface between two types of materials causes discontinuous stress transfer and cracking. Here, inspired by the squid beak, we report a type of high impact-resistance gradient elastomers with large-scale modulus gradient with about three orders of magnitude (modulus range of 7 × 10 3 ∼ 7 × 10 6 Pa) and high energy dissipation (loss factor > 0.6) over a wide temperature range by diffusively introducing stiff polymers in a highly damping elastomer with controlled mechanical properties. Under the action of an external force, our gradient elastomers exhibit soft-while-stiff attributes, combining cushioning and support. In drop hammer impact tests, our gradient materials can reduce impact strength by 80 %, significantly better than commercial protective gear. It is worth mentioning that the modulus of the bottom layer matches that of the tissues for better protection.
研究领域:
材料科学
·
生物力学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Di Wang,Shouhua Feng,Ming Yang
The heterogeneity of bones is elegantly adapted to the local strain environment, which is critical for maintaining mechanical functions. Such an adaptation enables the strong correlation between strain distributions and multiple gradients, underlying a promising pathway for creating complex gradient structures. However, this potential remains largely unexplored for the synthesis of functional gradient materials. In this work, heterogeneous bone-like nanocomposites with complex structural and compositional gradients comparable to bones are synthesized by inducing strain distributions within the polymer matrix containing amorphous calcium phosphate (ACP). Uniaxial stretching of composite films exerts the highest strain in the center, which ceases gradually toward the sides, resulting in the gradual decrease of polymer alignment and crystallinity. Simultaneously, the center with high orientation traps most ACP during stretching due to the nanoconfinement effect, which in turn promotes the formation of aligned nanofibrous structures. The sides experiencing the least strain have the smallest amounts of ACP, characteristic of porous architectures. Further crystallization of ACP produces oriented apatite nanorods in the center with a larger crystalline/amorphous ratio than the sides because of template-induced crystallization. The combination of structural and compositional gradients leads to gradient mechanical properties, and the gradient span and magnitude correlate nicely with strain distributions. Accompanying bone-like mechanical gradients, the center is less adhesive and self-healable than the sides, which allows a better recovery after a complete cutting. Our work may represent a general strategy for the synthesis of biomimetic materials with complex gradients thanks to the ubiquitous presence of strain distributions in load-bearing structures.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Yanru Zheng,Yifan Yan,Yuting Du,Fuchao Yang,Zhiguang Guo
The challenge of alleviating the water scarcity crisis is a serious problem faced worldwide. Harvesting water from atmospheric fog is an intriguing process. Taking inspiration from the multilayered micro-nanostructure of Phyllostachys leaves and the wetting gradient of spider silk combined with the leaf vein like pattern, a biomimetic system with hybrid and gradient wetting surfaces was designed and manufactured using laser etching technology and gradient anodizing technology. Under the synergistic effect of wetting driving force and gravity, the discharge of droplets was accelerated, thereby improving the efficiency of fog water collection, which is about 80% higher than the control sample. This sample integrates droplet capture, coalescence, and transportation functions, providing a new approach for the design of efficient mist collectors.
研究领域:
材料科学
·
环境科学
·
仿生学
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2022
·
IF 9.417
Jia Yang,Wanqi Zhao,Panpan Lin,Qiuguang Zhang,Xinfei Zhang,Weihang Liu,Tiesong Lin,He Peng,Yanli Zhuang
We designed a composite filler beginning with becoming light elements to be the main diffusing elements and (ii) controlling the diffusion of the light elements. It was achieved by establishing chemical potential and supercooling gradients and shortening the diffusion distance. As a result, a transient liquid phase bonding (TLP) composite joint with hedgehog-like reinforcements and a ductile matrix was obtained. The room-temperature (RT) shear strength of the joint produced at 460 °C for 30 min was up to 84 MPa, and it had a strength of 30 MPa at 600 °C. The hedgehog-like” reinforcements with finer or longer whiskers can provide a better load transfer effect. The progressive phase formation around NiTi was induced by the large supercooled liquid, wherein either the fastest-solidified region or the deepest-supercooled liquid served as a barrier for metallic atoms. Consequently, the lower supercooling and higher Si chemical potential in the farther region enable Si to directionally diffused towards the NiTi. This study offered a novel filler feasible for most ceramic/metal systems with the goals of low-temperature joining and high-temperature using and controllable product distribution; and this idea can be extended to develop other systems.
研究领域:
材料科学
·
焊接工程
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Zhao-Feng Yuan,Williamson Gustave,John Boyle,Raju Sekar,Jonathan Bridge,Yuxiang Ren,Xianjin Tang,Bin Guo,Zheng Chen
The sharp redox gradient at soil-water interfaces (SWI) plays a key role in controlling arsenic (As) translocation and transformation in paddy soils . When Eh drops, As is released to porewater from solid iron (Fe) and manganese (Mn) minerals and reduced to arsenite . However, the coupling or decoupling processes operating within the redox gradient at the SWI in flooded paddy soils remain poorly constrained due to the lack of direct evidence. In this paper, we reported the mm-scale mapping of Fe, As and other associated elements across the redox gradient in the SWI of five different paddy soils. The results showed a strong positive linear relationship between dissolved Fe, Mn, As, and phosphorus (P) in 4 out of the 5 paddy soils, indicating the general coupling of these elements. However, decoupling of Fe, Mn and As was observed in one of the paddy soils. In this soil, distinct releasing profiles of Mn, As and Fe were observed, and the releasing order followed the redox ladder. Further investigation of As species showed the ratio of arsenite to total As dropped from 100% to 75.5% and then kept stable along depth of the soil profile, which indicates a dynamic equilibrium between arsenite oxidization and arsenate reduction. This study provides direct evidence of multi-elements’ interaction along redox gradient of SWI in paddy soils.
研究领域:
土壤学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Nanoscale Research Letters
·
2022
·Vol. 17
·期 1
·1-7
·
IF 5.418
Chen Anqi,Lv You,Wu Yanyan,Zhu Yuan
Creating gradients of nanostructure on the surface has found broad applications such as enhanced optical spectroscopy, optical storage of information, and broadband solar energy harvesting. Here, a facile strategy is presented for fabricating gradient nanoparticle arrays with tunable size. It takes a ZnO:Ga microwire as the starting material, and the Ga 3+ doping gradient along the microwire is induced by the high voltage applied. Such a doping gradient facilitates the formation of a temperature gradient in a Joule heating process. And this temperature gradient produced by this technique can be as high as 800 °C/mm, which could be later used for gradient annealing of thin metal films. After annealing, the thin metal films turn to gradient nanoparticle arrays. The obtained gradient nanoparticle arrays are confirmed effective in multi-wavelength surface enhanced Raman scattering enhancement.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 51
·2305411
·
IF 19
Na Meng,Yufei Zhang,Yanyan Lin,Cengceng Zhao,Zhaoling Li,Xianfeng Wang,Jianyong Yu,Bin Ding
Developing textiles with rapid moisture-wicking capability is a potential and effective solution to the poor comfort of medical and health-protective clothing. However, designing protective clothing that combines safety and comfort remains a crucial and formidable task. Herein, a moisture-wicking protective fibrous membrane (MWPFM) with a dual-gradient structure manufactured by electrospinning and electrostatic spraying techniques is proposed. Interestingly, the protective layer with a small pore structure and an extremely hydrophobic effect can block water, blood, and ethanol. Additionally, the textile is designed in a multilayer configuration with a wetting gradient and pore structure gradient, ensuring comfort. The MWPFM exhibits excellent protective properties (ethanol contact angle of 115°, hydrostatic pressure of 14.8 kPa) and comfort (breathability of 46.8 mm s −1 , water vapor transmission rate of 5.9 kg m −2 d −1 ). In addition, compared with the commercially available high-density polyethylene protective membrane, MWPFM displays a distinct comfort advantage. This work provides a fresh avenue to improve the thermal-moisture comfort of medical and health-protective clothing.
研究领域:
纺织材料学
·
生物医学工程
·
防护材料研究
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2012
·
IF 4.186
Xu Zhang,Xinghua Gao,Lei Jiang,Jianhua Qin
The nanofiber surface modified with physical or chemical gradients is very useful in a wide range of areas including tissue engineering, regenerative medicine, drug screening, and biomaterial chemistry. In this work, we presented a novel and straightforward microfluidic assisted approach to produce electrospinning nanofibers containing gradients in different compositions, nanoparticles and biomolecule concentrations. The series of gradient nanofibers were mainly produced by using a two inlet microfluidic device in combination with an electrospinning nozzle on a 3-D controllable platform, which exhibited different functions and properties. The controlled nanofibers with incorporated biomolecule gradient were used for guiding the spatial differentiation in mesenchymal stem cells (MSCs). This established approach is very simple, and flexible to operate, which might find enormous potential for biology and tissue engineering applications.
研究领域:
生物材料
·
组织工程
·
再生医学
·
细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2017
·
IF 4.162
Qian Liu,Chaoping Xu,Heng Liang
We developed novel laser carved micro-crack (LCC) paper-based channels to significantly accelerate the liquid flow without an external pump. For the aqueous solutions they increased the flow velocity 59 times in 16% laser power-8 micro-cracks-LCC channel compared with it in solely-printed channels. All experimental data from both LCC and solely-printed channels were well-fitted by the time-distance quadratic trinomial that we developed on laser power and micro-crack number. We designed and fabricated T-junction microstructures of LCCs. Further, the microfluidic paper-based analytical device (μPAD) of LCC on dye mixing gradient and pH gradient were developed with the characteristics, fast self-acting transportation and high-performance mixing of liquid flows. In the dye mixing gradient the time cost was reduced from 2355 s in the solely-printed one to only 123 s in the five-stage of this LCC-μPAD. It was useful for quick and long-distance transferences through the multiple units of μPADs. Certainly, this LCC-μPAD was inexpensive, disposable, portable and applicable to resource-limited environments.
研究领域:
生物医学工程
·
微流控技术
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 3
·2037-2048
·
IF 2.993
Wang Kelai,Liang Zheng,Li Jingling,Xu Xueqing,Cheng Xiaoling,Jin Hu,Xu Dehua,Xu Gang
Photoluminescent CuIn(Se x S 1 − x ) 2 (CISeS) nanocrystals (NCs) have been synthesized utilizing copper iodide (CuI) and indium acetate (In(Ac) 3 ) as metal cation precursors, Se powder and n -dodecanethiol (DDT) as selenide and sulfur source, combined with oleylamine and n -dodecanethiol as coordinate ligands at a moderate reaction temperature of 200 °C. The obtained CISeS NCs consisted of a gradient composition that the content of selenide increased from the nuclei to the surface. With the growth of NCs, they exhibited a tunable photoluminescent emission ranging from 722 to 830 nm which was size- and composition-dependent. The photoluminescent quantum yield of the NCs could be further enhanced from 1.2 to 40.7% after ZnS coating due to the formation of ZnCuIn(Se x S 1 − x ) 2 /ZnS (ZnCISeS/ZnS) core–shell structures with the alloyed core. The photoluminescence emission mechanisms of CISeS NCs indicated that the gradient composition structure of CISeS led to a gradient energy level of its conduction band (CB)/valence band (VB), resulting in the charge transfer from the nuclei to the surface through the quantized CB/VB. This transfer process has quenched fluorescence emission arising from the quantized CB/VB and defect states located in the nuclei, such as irradiation relaxation between quantized CB and \( V_{\text{Cu}}^{ \prime } \) . This mechanism could illuminate why the indium-rich CISeS NCs did not exhibit better photoluminescence properties.
研究领域:
材料化学
·
纳米科学
·
半导体光学
·
光电子学
·
胶体化学
·
能源材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）