ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Huiying Xiang,Yuan Yuan,Cheng Zhang,Xu Dai,Tao Zhu,Linbo Song,Yu Gai,Ruijin Liao
Slippery liquid-infused porous surfaces (SLIPSs) are widely used as an effective passive approach to reduce icing disasters. However, various porous structures make SLIPSs exhibit different droplet mobility and lubricant stability. Undoubtedly, the substrate surface has a great impact on the durable anti-icing of SLIPSs. Herein, surfaces with different pore sizes and porosities were prepared to study their effects on the performance of SLIPS. The results show that small pores and high porosity are beneficial for the preparation of durable anti-icing SLIPS. The small pore size (about 100 nm) has a strong capillary pressure on the lubricant, and the surface with high porosity (66%) possesses a large lubricant–liquid contact ratio. These two can greatly improve the lubricant stability of SLIPS and achieve rapid self-healing. The SLIPS prepared by a suitable porous surface shows excellent anti-icing performance in the simulated glaze ice and durable anti-icing ability in the long-term icing/deicing cycles. In detail, the prepared SLIPS experiences more than 140 icing/deicing cycles through four effective self-healing while maintaining extremely low ice adhesion (<20 kPa). This work proposes a certain improved SLIPS with small pores and high porosity to achieve excellent durable anti-icing performance, broadening the practical applications of SLIPS.
研究领域:
材料科学
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表面工程
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产品关联
DOI
PubMed
高影响因子
Fundamental Research
·
2023
·
IF 6.2
Yingdan Zhang,Ningning He,Jie Zhang,Zhimin Jia,Xiaofeng Li,Ning Liu,Yang Li,Lijian Ma
ABSTRACT The extensive use of nuclear energy has led to an urgent need for effective management of radioactive waste. Membrane separation of radionuclides is considered to be a promising method for nuclear waste treatment and resource recovery. However, most reported membranes have difficulties achieving a balance between permeability and selectivity. In this work, we propose a dual strategy to produce sub-nanometer COF-based membranes, which includes constructing covalent organic frameworks (COFs) from smaller building blocks (‘pore segmentation’) and introducing a graphene oxide (GO) nanosheet by weak interaction to shield pores (‘pore shielding’) during the preparation of COF membranes. The as-prepared TpDAH@GO membrane shows two times higher permeability ( P K = 4.5 mmol m −2 h −1 ) than that of pure GO membrane due to the retention of unique ‘pore transport’ of COFs. In addition, the selectivity of TpDAH@GO membrane for metal ion sieving ( S K/Th = 3.93) nearly doubles when compared with that of the original COF membrane, due to the additional introduction of ‘interlayer transport’. The dual strategy proposed in this study successfully constructed a sub-nanometer COF-based membrane and achieved a valuable balance between permeability and selectivity on the membrane, which provides new possibilities for the pore regulation of COF membranes as well as the preparation of high-performance sub-nanometer membranes for efficient metal ion sieving.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Journal of Building Engineering
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2023
·
IF 6.4
Na Xu,Zijian Song
To investigate the microstructure of self-healing concrete before and after ultrasonic triggering, mercury intrusion porosimetry (MIP) test and industrial CT technology were applied to analyze the pore structure of self-healing concrete. The results show that ultrasonic triggering, on one hand, can improve the triggering of microcapsules, reducing less harmful pores, harmful pores and extremely harmful pores. On the other hand, excessive ultrasonic triggering will slightly damage the microstructure of self-healing concrete. The total porosities of self-healing concrete with 6 % microcapsules after ultrasonic and mechanical triggering were 8.6 % and 15.9 %, respectively. The simulation results of porosity are consistent with the MIP results (8.7 % and 15.6 %, respectively). The gray values of microcapsules and the cement matrix are 55 and 126, respectively. Finally, based on the CT reconstruction simulation, the substrate fluid velocity after ultrasonic triggering is lower than that triggered by mechanics.
研究领域:
土木工程
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材料科学
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DOI
高影响因子
Polymers
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2020
·Vol. 12
·期 9
·1926
·
IF 3.426
Yanyi Wen,Bing Yu,Zhongjie Zhu,Zhuoran Yang,Wei Shao
In the present study, sponges with the antibiotic tetracycline hydrochloride (TCH) loaded into alginate incorporated with gelatin (G/SA) were fabricated. The G/SA sponges were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric (TG) analysis. G/SA sponges show a three-dimensional network structure with high porosity. An excellent swelling behavior and a controlled TCH release performance are observed from G/SA sponges. Moreover, they exhibit good antibacterial activity against both Gram-positive and Gram-negative bacteria.Keywords:alginate;gelatin;porosity;antibacterial
研究领域:
生物材料
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医学工程
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产品关联
DOI
PubMed
高影响因子
FUEL
·
2021
·
IF 6.609
Ao Wang,Wei Xu,Yunjuan Sun,Kang Sun,Jianchun Jiang
High electrical conductivity and excellent pore affinity for electrolyte are the two necessary characteristics for high-rate performance supercapacitors based on activated carbon electrode. Nevertheless, it is fairly challenging to simultaneously improve them due to they are usually in the tug of war relationship in aqueous electrolyte. Herein, based on the different antioxidant abilities of graphitized carbon and amorphous carbon, a well-designed heterogeneous structure activated carbon (HGCAC) with graphitized carbon shell, amorphous carbon inner, and hydrophilic pores has been successfully prepared by a combined procedure of solid phase grinding, catalytic graphitization, and hydrothermal oxidation. Owing to the heterogeneous structure, HGCAC exhibits a joint improvement of electrical conductivity and the pore affinity for aqueous electrolyte, and thus leads to the remarkable enhancement of capacitance and rate capability, in comparison with the commercial coconut shell derived activated carbon (CAC) for supercapacitor. When the current density increases 100 times to 50 A g −1 , the specific capacitance of as-made HGCAC is 203.4 F g −1 , with the capacitance retention of 81.0%, being nearly 2.14 times of CAC’s capacitance (95.2 F g −1 ) and 1.6 times of its capacitance retention (51.0%). Moreover, good rate capability is still maintained when HGCAC is assembled to a coin type supercapacitor, with the capacitance retention of 82.1% at 50 A g −1 .
研究领域:
材料科学
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能源存储
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DOI
高影响因子
Processes
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2022
·Vol. 11
·期 1
·102
·
IF 3.352
Libo Liu,Qiming Zhuo,Hongxiang Xu,Donghui Wang
The accurate determination of the coal slime filter cake pore structure has always been a problem in the field of solid–liquid separation. An innovative measurement method for the pore structure of filter cake after filtration dehydration of coal slime water, including the preparation of coal slime filter cake, the solidification of the filter cake, and the preparation and measurement of test filter cake, was established in this paper. Epoxy resin and curing agent can ensure the strength of the filter cake, and red colorant can realize the accurate separation of coal particles and pores. The most suitable perfusate consists of epoxy resin, red colorant, and curing reagent, and the optimal ratio is 12:3:5. The application of the method to the study of the effect of filtration time on the coal slime filter cake pores shows that the modified method is effective. At the initial stage of filtration, intergranular pores formed by coarse particles are the main pores. With increasing filtration time, the macropores formed by the coarse particles are mainly filled with fine particles, and the pore size of the filter cake rapidly decreases. These measuring results and rules are accurate. This method can be conveniently used to study the microstructure of filter cake, pore channel regulation, filtration dehydration mechanisms, etc.Keywords:pore structure;coal slime filter cake;solidification;filtration time
研究领域:
矿业工程
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材料科学
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DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 21
·7492
·
IF 3.748
Min Qiao,Jingzhi Wu,Nanxiao Gao,Guangcheng Shan,Fei Shen,Jian Chen,Bosong Zhu
In this study, a series of polyether-type defoamers for concrete which consist of the same alkyl chain (hydrophobic part) but different polyether chains (hydrophilic part) was prepared, and the structure–property relationship of the defoamers was investigated for the first time. Using oleyl alcohol (OA) as the starting agent (alkyl chain), the polyether defoamers with different polyether chains were prepared by changing the amount and sequence of ethylene oxide (EO) and propylene oxide (PO) units. The properties of different defoamers were tested in aqueous solutions, and fresh and hardened mortars; the structure–property relationship of the defoamers was thus studied. The results indicated that the defoaming capacity of the polyether defoamers decreased with an increased EO amount, and the defoamers linked with both EO and PO units (PO before EO) had a stronger defoaming capacity than those linked with EO only. This study is beneficial for the development and applications of novel synthetic polyether-type defoamers for concrete.Keywords:polyether;defoamer;bubble;air void;mortar;concrete
研究领域:
建筑材料学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Mingyang Su,Xiaobo Song,Nanyang Zhao,Zhongbin Xu,Xing Huang
A strategy for fabrication of macroporous hydrogels through 3D printing assisted by molding and multiple microfluidic bubble-templating nozzles is proposed here. This approach aims to address the challenges faced by methods for 3D printing macroporous hydrogels, such as difficulties in precisely controlling the spatial distribution of macropores, limited porosity, and low resolution of external boundaries due to the poor mechanical properties of hydrogel solutions as printing ink. In this method, fast-switching microfluidic bubble-templating nozzles of varying sizes allowed for precise control of target pore sizes over a wide range. Cavities of polydimethylsiloxane (PDMS) molds were used to define the overall external shape of the hydrogels and enhance the resolution of the boundaries. During the printing process, the laminar shear force generated by a coaxial microfluidic system generated microbubbles which were then injected into the PDMS mold cavities. The spatial distribution of the microbubble clusters within the cavities was controlled by a 3D motion module. Finally, macroporous hydrogels with a pore size range of 238–930 μm were fabricated while avoiding millimeter round corners on the boundaries. A control precision of pore sizes was about 60 μm. Most importantly, this strategy broke through the space occupancy limitations of pores in traditional 3D printing methods for macroporous hydrogels. The space occupancy of pores could reach a maximum of about 87% within a single layer.
研究领域:
材料科学
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生物医学工程
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3D打印
·
水凝胶制备
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DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Xin Zhong,Baihong Li,Chao Li,Lijun Zhang,Shu Zhang,Xun Hu
As an indispensable fraction of majority biomass, inorganics might not be inert in activation, due to their potential interaction with volatiles/activators and steric hindrance created for accessing organics in inner structure by activator. This was verified herein by conducting the activation of rice husk (RH), with inherent silica leached partially or completely by KOH, with ZnCl 2 or K 2 C 2 O 4 as an activator at 550 or 800 °C. The results indicated that removal of SiO 2 promoted condensation reactions with ZnCl 2 while cracking reactions with K 2 C 2 O 4 , forming more activated carbon (AC) with ZnCl 2 (41.1 %) but less AC-K 2 C 2 O 4 on organic basis (26.8 %). This resulted from enhanced permeability and more sufficient contact of the activator to organics via eliminating steric hindrance. After removing SiO 2 , the specific surface area increased from 1348.8 to 1712.3 m 2 /g −1 with ZnCl 2 as an activator, while that with K 2 C 2 O 4 increased from 615.4 to 1121.6 m 2 /g −1 . Moreover, the degree of aromatization in activation also increased after removing SiO 2 , forming rigid aromatic skeleton preserving micropores formed (97.6 % versus 86.0 % with AC-RH-K 2 C 2 O 4 ). The in-situ IR characterization of activation process confirmed negative impacts of SiO 2 on aromatization process from segregation of organics, which further deterred development of pores.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Meigeng Gao,Elena Yu Konysheva,Jun Yang
The La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF) ceramics with the porosity of 20% (LSCF-20) and 50% (LSCF-50) were fabricated through temperature variation. Kinetics of the Cr-adsorption has been studied at 700 °C over 345 h under air. Different dominant mechanisms of Cr chemisorption over the ceramics with different porosities were identified. The Cr–substitution into the LSCF perovskite grains will dominate in the denser LSCF-20 ceramics, whereas the growth of SrCrO 4 crystals over the LSCF perovskite phase will occur preferably in the more porous LSCF-50 ceramics. The Cr penetrates into a more porous LSCF-50 ceramics up to 12–17 μm and the total Cr amount adsorbed after 345 h over the LSCF-50 ceramics is larger by about 10 times than over the denser LSCF-20 ceramics. The revealed remarkable differences could be associated with the increase in the surface area and with a higher volume of macro- and mesoporosity.
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
APPLIED CLAY SCIENCE
·
2020
·
IF 4.605
Pei Li,Jinchuan Zhang,Reza Rezaee,Wei Dang,Xuan Tang,Haikuan Nie,Shijing Chen
The variation in pore water distribution within gas shale reservoirs has a significant effect on gas content, and thus on resource evaluation. However, the characteristics of water micro-distribution and its effects on pore parameters are still not well understood due to the mixed wettability of shale and the complexity of the pore structure . In this study, six lower Permian transitional shale samples from the southern North China Basin, humidified at four levels up to a relative humidity of 98%, were selected for moisture-equilibrated experiments and low-pressure N 2 gas adsorption measurements. The results indicate that the adsorbed moisture in transitional clay-rich shales can be divided into capillary condensation water in the micropores and monolayer–multilayer adsorbed water in the non-micropores. Moreover, thermal maturity (VR o ), total organic carbon , clay, and carbonate are positively correlated with the adsorbed moisture and micro-/mesopores, indicating that water in shales could be hosted in inorganic pores as well as in organic pores. Furthermore, the distribution of adsorbed moisture is mainly controlled by the VR o , component wettability (i.e., organic matter, clay, pyrite, and carbonate), and pore structure (micro-/mesopore distribution). In addition, a subtle adsorbed moisture may significantly reduce both the pore volume (PV) and specific surface area (SSA) of micropores, and the effect on micropores and SSA is more pronounced than that on the respective non-micropores and PVs. Additionally, the mechanism of clay swelling and pore expansion in clayey shale can provide certain insights for water–methane competitive adsorption, identifying clay type and pore size, and the formation of organo-mineral complexes.
研究领域:
地质学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2025
·
IF 6.2
Zahra Essa Khan,Mengjiao Fan,Yuchen Jiang,Shu Zhang,Murtaza Khan,Qurshia Choudhry,Muhammad Rashid,Zanib Anwar,Sobia Kousar,Xun Hu
Herein, hydrothermal carbonization treatment of shrimp shells or together with glucose at 200 ºC plus subsequent activation with K 2 C 2 O 4 at 800 ºC was conducted, aiming to understand the retainment of organics and development of pore structures of resulting activated carbon. The results indicated that the organics in shrimp shells were highly unstable and the activation formed activated carbon with a mass yield of 5.6 %. Hydrothermal carbonization resulted in the leaching of some organics but promoted the aromatization of others, which in overall enhanced the resistivity of remaining organics towards cracking in activation, increasing the yield of activated carbon to 10.3 %. However, the leaching of a significant portion of aliphatic organics also decreased the specific surface area to 1128.1 m 2 /g (1593.2 m 2 /g from direct activation of shrimp shells. The co-hydrothermal carbonization of shrimp shells with glucose further increased activated carbon yield and enhanced the specific surface area of the activated carbon (1326.6 m 2 /g), due to additional aliphatic organics formed. Additionally, direct activation of shrimp shells formed activated carbon with dominant micropores (89.6 %), while hydrothermal carbonization of shrimp shells plus activation formed mainly mesopores (71.7 %). The presence of glucose in co-hydrothermal carbonization not only rendered micropores to dominate (80.3 %) but also retained appreciable amount of mesopores, forming activated carbon of superior capacity for the adsorption of methylene blue. Leaching of organics via the hydrothermal carbonization, promoted the formation of mesopores/macropores while suppressed the generation of micropores. Additionally, hydrothermal carbonization treatment resulted in wrapping of SiO 2 with organics, deterring further removal of SiO 2 via solid phase reactions with K 2 C 2 O 4 .
研究领域:
生物医学工程
·
环境科学
·
材料科学
·
化学工程
✓ 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）