Polymers
·
2022
·Vol. 14
·期 22
·4933
·
IF 4.967
Yuezhen Hua,Wang Cui,Zekai Ji,Xin Wang,Zheng Wu,Yong Liu,Yuyao Li
Fibrous air filtration materials are highly desirable for particle removal from high-temperature emission sources. However, the existing commercial filter materials suffer from either low filtration efficiency or high pressure drop, due to the difficulty in achieving small fiber diameter and high porosity simultaneously. Herein, we report a facile strategy to fabricate mechanical robust fibrous aerogels by using dual-scale sized PAI/BMI filaments and fibers, which are derived from wet spinning and electrospinning technologies, respectively. The creativity of this design is that PAI/BMI filaments can serve as the enhancing skeleton and PAI/BMI fibers can assemble into high-porosity interconnected networks, enabling the improvement of both mechanical property and air filtration performance. The resultant dual-scale sized PAI/PBMI fibrous aerogels show a compressive stress of 8.36 MPa, a high filtration efficiency of 90.78% (particle diameter of 2.5 μm); for particle diameter over 5 μm, they have 99.99% ultra-high filtration efficiency, a low pressure drop of 20 Pa, and high QF of 0.12 Pa−1, as well as thermostable and fire-retardant properties (thermal decomposition temperature up to 342.7 °C). The successive fabrication of this material is of great significance for the govern of industrial dust.Keywords:polyamide-imide;structural construction;air filtration;binary aerogels
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2017
·Vol. 123
·期 5
·1-9
·
IF 1.455
Li Hao,Yu Sirong,Xie Wenxian,Han Xiangxiang,Wang Xinhui
Surface morphology is known as the key factor to obtain lyophobic surface. This paper illustrates two superhydrophobic surfaces with different surface morphologies including single-scale nanorod structure and dual-scale flower-like structure. We compared contact angles of many liquids and dynamic behavior of water droplet impinging on the nanorod structured surface to those of on the flower-like structured surface. It was found that both the single-scale nanorod structure and the dual-scale flower-like structure can achieve superhydrophobicity. However, the dual-scale flower-like structure is superior to the single-scale nanorod structure in terms of repelling the droplet with low surface tension. In addition, we investigated stability and corrosion resistance of these two superhydrophobic surfaces, showing that both the single-scale nanorod and the dual-scale flower-like structured superhydrophobic surfaces had excellent long-term stability and thermal stability. Nevertheless, the dual-scale flower-like structured superhydrophobic surface was more stable under outside vibration and had better corrosion resistance than the single-scale nanorod structured superhydrophobic surface.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Yingying Yin,Lei Zhu,Tianchao Guo,Xurong Qiao,Shaopeng Gan,Xiao Chang,Xiaofang Li,Fujun Xia,Qingzhong Xue
The development of efficient oil/water separation membranes is highly significant for reducing severe environmental pollution nowadays. Constructing hierarchical structures with double-scale roughness and inverted trapezoidal geometry is an alternative rational design to fabricate low oil-adhesive membranes. Based on this design concept, a Cu mesh vertically wrapped with novel microphone-like Cu-CAT-1 hierarchical microstructures with double-scale roughness was tactfully prepared by a local concentration effect, which was referred to as CCMOF. The CCMOF possessed superior anti-oil-fouling performance and an outstanding water-absorbing capacity (180.3% larger than that of the pristine Cu mesh) due to its ingenious microphone-like structures and its high affinity for water. Therefore, it could separate various types of oil/water mixtures with a considerably high flux of over 25,000 L m −2 h −1 and an extremely low oil content in filtrate of below 10 ppm. The design concept of this work offered a simple idea to design low oil-adhesive membranes for efficient oil/water separation.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jinghui Zhi,Li-Zhi Zhang
In this study, a superhydrophobic surface coating with highly antireflective properties that maintains a high durability and light transmittance was synthesized for possible use on the glass covers of solar cells. The coating was made in two steps to form a dual-scale structure. First, a 3D crosslinked network of nanopores was formed from the volatilization of pore-forming agents during calcination. Second, silica nanoparticles in a sol were attached to the nanopore structure, thereby reducing the size of the pore structures and forming a dual-scale structure. The refractive index of the coating was reduced to 1.3471, making the surface antireflective. The coated surface possessed an average transmittance as high as 97%, in contrast to the transmittance of 90% of the bare glass substrate. Meanwhile, the surface was superhydrophobic, showing a static water contact angle of 157.9° and a contact angle hysteresis of 1.2°. As a result, the as-prepared superhydrophobic coating showed outstanding self-cleaning properties. Moreover, the surface showed remarkable stability against strong acid, strong alkali and the impact of water drops. Further, the surface passed a 4H pencil hardness test. This facile and low-cost production method is believed to offer an effective solution for industrial applications in solar cells and windows, among others.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2020
·Vol. 23
·期 1
·2000913
·
IF 3.217
Enyang Liu,Liyuan Wang,Xiaoli Yin,Jinhui Hu,Sirong Yu,Yan Zhao,Wei Xiong
Herein, a superhydrophobic Ni coating is prepared on 316L stainless steel by electrodeposition and low energy modification with tetradecanoic acid. After 20 min of electrodeposition with a current density of 8 A dm −2 , a Ni coating with micro–nano dual-scale structures is obtained. The coating becomes superhydrophobic with a water contact angle (WCA) of 160.4° and a sliding angle (SA) of 8.3° after being immersed in the tetradecanoic acid solution (5 g L −1 , 12 h). A two-level structure model is established for explaining the effect of morphology on the wettability of the coating. The WCA value of the superhydrophobic Ni coating retains above 150° after being exposed in outdoor environment for 6 months and in flowing environment for 7 days. In addition, the coating still shows superhydrophobicity after 9 times of mechanical abrasion test, 12 h of acid soaking (pH = 1), and 16 h of heat treatment in 200 °C. Moreover, the coating improves the corrosion resistance of the steel substrate. This superhydrophobic Ni coating provides a simple method to prevent stainless steel from corrosion. And the theoretical calculation of the two-level model can provide an innovative strategy for designing the structure of the superhydrophobic coating.
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
Small
·
2025
·
IF 12.1
Xin Wang,Xiaoming Chen,Baichuan Wang,Qingyuan He,Jincao Cao,Ye Zhu,Kewei Su,Huiyi Yan,Pengsong Sun,Runlang Li,Jie Zhang,Jinyou Shao
Aerogels with porous structures offer an attractive approach to modulating electromagnetic parameters and enhancing electromagnetic wave (EMW) absorption performance. However, conventional aerogels are limited by their single-scale pore size and fixed orientation, which constrain their EMW absorption capabilities. This study introduces aerogels with dual-scale pores and dual-network structure constructed via constant-temperature freezing and secondary-infusion freezing method. Multiscale aerogels with both micrometer- and submillimeter-scale pores are constructed when the Ti 3 C 2 T x MXene and thermoplastic polyurethane solution is frozen and dried at a specific temperature, leading to an ultra-wide effective absorption bandwidth (EAB) reaching 10.41 GHz in the vertical direction. Furthermore, to address the poor EMW absorption in the parallel direction, a secondary infusion freezing method is applied to form an aerogel with a dual-network structure, which forms reflective interfaces perpendicular to the incident EMW in various directions. This adjustment enhances the EAB in the parallel direction from 1.58 to 5.93 GHz, marking a 275.32% enhancement, while the EAB in the vertical incident direction reaches 8.08 GHz. This design strategy overcomes the limitations of structural scale and arrangement direction, enriching the attenuation mechanisms of the absorber, while effectively reducing sensitivity to the direction of incoming EMW, offering new insights for designing efficient EMW absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Di Wang,Zhiqiang Zhou,Tianle You,Bing Liu,Qingqing Xie,Lingyun Wang,Guilong Xu,Yun Liang,Min Tang
Air pollution has necessitated the large-scale utilization of air filters in aerospace, healthcare, personal protection, and manufacturing sectors. However, high-efficiency filters often exhibit high airflow resistance, increasing energy costs, especially when filtering liquid airborne pollutants like oil aerosols. These pollutants tend to coalesce into liquid films on the filters. Although regulating the wettability of a filter can reduce airflow resistance, the dynamic coalescence behavior and its effects on airflow transport remain unclear. Herein, we present a dual-scale Janus filter for oil aerosol capture. This filter, produced using an industrial papermaking process, features a pore-size gradient and asymmetric wettability. The dynamic coalescence behavior between oil aerosols and filter surfaces at the micro/nanoscale indicates that the superoleophilic layer serves as an oil-guiding layer, destroying the integrity of the oil film deposited on the superoleophobic filter layer and thereby facilitating airflow transport across the Janus filter. The Janus filter exhibits a 30 % lower steady-state pressure drop, higher filtration efficiency (99.4 %), higher dust-holding capacity (286 g m −2 ), and >8 times longer lifetime than those of commercial filters. As a proof-of-concept, the performance of an air purifier comprising Janus filters is demonstrated. These findings promote the development of efficient, energy-saving coalescence filters.
研究领域:
材料科学
·
环境科学
·
过滤技术
✓ 已验证
产品关联
DOI
高影响因子
WEAR
·
2015
·
IF 1.913
Z.C. Lu,M.Q. Zeng,Y. Gao,J.Q. Xing,M. Zhu
In this work, an attempt was made to further promote the wear and friction behavior of dual-scale structured Al–12 wt% Sn bearing alloys by coupling with a nano-Si@Sn composite. A so-called tri-modal Al–Sn–Si (denoted as CG-30 Si-containing alloy), which exhibited increased bulk hardness and improved distribution and refinement of the Sn phase, was produced by combining mechanical alloying and conventional powder sintering. The wear performance of the Si-containing and Si-free alloys was differentiated by performing both block-on-ring and ball-on-disk testing. Moreover, the addition of nano-Si@Sn composites to the dual-scale Al–Sn matrix resulted in significant reductions of the friction coefficient and wear volume. These improvements in wear behavior stemmed from the polishing effect of fine Si particles on the counterface , and Sn-rich clusters that acted as lubricants on the worn surface; together, the polishing effect and lubrication led to the formation of a smooth tribolayer, and hence, a decrease in the tendency for abrasive wear . Abrasive wear was also reduced by an increase in the alloy hardness with the addition of Si. As such, Sn-phase modification via Si addition constitutes a promising method for preparing self-lubricating Al-based alloys.
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL SPRAY TECHNOLOGY
·
2022
·Vol. 31
·期 8
·2463-2475
·
IF 2.839
Liu Ji,Chen Tongzhou,Duan Haitao,Yuan Chengqing,Bai Xiuqin
Cavitation erosion is a major failure mode of hydraulic turbine components. Coatings could be an effective solution to this problem. In this study, a CeO2-modified (1 wt%) dual-scale WC-10Co-4Cr powder (WC composed of 70 wt% micrometer WC (2.5 μm) and 30 wt% nanometer WC (100 ~ 200 nm)) was fabricated by agglomeration and sintering. CeO2-modified dual-scale WC-10Co-4Cr coatings (C-coating), dual-scale WC-10Co-4Cr coatings (D-coating), and micrometer WC-10Co-4Cr coatings (M-coating) were then deposited using a high-velocity oxygen fuel (HVOF). The mechanical properties and cavitation erosion behavior of these coatings were studied. The results showed that the CeO2-modified WC-10Co-4Cr coatings could effectively reduce decarburization in the powder preparation and HVOF process, the coatings having the highest WC retention rate. The C-coatings possessed a higher fracture strength (6.3 MPa m 1/2 ) and hardness (1348.2 HV0.3) than the D-coatings by more than 8.6 and 3.0%, respectively. The cavitation erosion resistance of the WC-10Co-4Cr coatings was affected by their microstructure and mechanical properties. The CeO2-modified coatings exhibited improved fracture toughness and hardness, reduced porosity, and, as a result, the C-coatings had the best cavitation erosion resistance.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Xiangming Yang,Yan Liu,Yuting Zhong,Hui Chen
The hydrophobic failure of superhydrophobic coatings in low-temperature, high-humidity environments, coupled with microstructural wear, constrains their practical application in antifreeze technologies. This study introduced a novel strategy utilizing micro-nano particle chains to promote directional alignment of polymer molecular chains, thereby constructing a hierarchical fibrous network architecture that significantly improves the hydrophobic stability of coatings under extreme conditions. Partially hydrophobic rigid microparticles serve as structural scaffolds to protect embedded nanoparticles while acting as reinforcing nodes that enhance the mechanical robustness of the coating matrix. The core–shell structures engineered via polydopamine (PDA) functionalization of micro-nano structured Fe 3 O 4 particles exhibit superior surface reactivity, facilitating the grafting of NH 2 -PDMS-NH 2 (PFe 3 O 4 @PDA). Dynamic imine bonds formed between diamino-terminated polymethoxysiloxane (NH 2 -PDMS-NH 2 ) and benzene-1,3,5-tricarbaldehyde (BTC) mediate the assembly of micro-nano particle chains, which through entropic confinement promote the formation of a hierarchical fibrous network during spray deposition, achieving a contact angle of up to 159.4 ± 0.49° and a rolling angle of 3.1 ± 0.18°. The network structure formed by nPFe 3 O 4 @PDA, distributed on the fiber surface, not only facilitates the self-drainage of condensed droplets and delays the freezing of water droplets, but also directs the formation of uniform ice shells, thus reducing ice adhesion strength. Furthermore, it enhances the photothermal conversion efficiency and thermal conductivity of the coating, enabling the complete melting of ice droplets within 58 s. This fibrous network coating, containing dual-scale particles, exhibits both mechanical and chemical stability, offering a viable design strategy for the implementation of superhydrophobic coatings in anti-icing applications.
研究领域:
材料科学
·
表面工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 35
·2405682
·
IF 27.4
Si-Chao Zhang,YuanZhen Hou,Si-Ming Chen,Zhen He,Ze-Yu Wang,YinBo Zhu,HengAn Wu,Huai-Ling Gao,Shu-Hong Yu
Assembling ultrathin nanosheets into layered structure represents one promising way to fabricate high-performance nanocomposites. However, how to minimize the internal defects of the layered assemblies to fully exploit the intrinsic mechanical superiority of nanosheets remains challenging. Here, a dual-scale spatially confined strategy for the co-assembly of ultrathin nanosheets with different aspect ratios into a near-perfect layered structure is developed. Large-aspect–ratio (LAR) nanosheets are aligned due to the microscale confined space of a flat microfluidic channel, small-aspect–ratio (SAR) nanosheets are aligned due to the nanoscale confined space between adjacent LAR nanosheets. During this co-assembly process, SAR nanosheets can flatten LAR nanosheets, thus reducing wrinkles and pores of the assemblies. Benefiting from the precise alignment (orientation degree of 90.74%) of different-sized nanosheets, efficient stress transfer between nanosheets and interlayer matrix is achieved, resulting in layered nanocomposites with multiscale mechanical enhancement and superior fatigue durability (100 000 bending cycles). The proposed co-assembly strategy can be used to orderly integrate high-quality nanosheets with different sizes or diverse functions toward high-performance or multifunctional nanocomposites.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2017
·
IF 2.589
K.Q. Song,Z.C. Lu,M. Zhu,R.Z. Hu,M.Q. Zeng
Nanocomposite Al–Sn-based bearing alloys produced by mechanical alloying (MA) exhibit high hardness; however, their poor sintering density and ductility limit their wide spread application. Here, we present a strategy to produce a dual-scale structure in an Al–Sn–Si alloy consisting of coarse and ultrafine grains through a combination of conventional powder sintering and thermomechanical treatment . We found that severe deformation and the presence of an Al–Si eutectic mixture for sample induced abnormal grain growth of Al to create the dual-scale Al–Sn–Si alloy through annealing treatment. An optimum matching of ductility and strength , and optimum wear performance were achieved at annealing temperatures of 500 and 550 °C. Detailed investigation of the wear mechanism revealed that the combination of high strength and high ductility provided by the dual-scale structure is a key factor for the improvement of the wear properties.
研究领域:
材料科学
·
机械工程
✓ 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）