ACS Applied Electronic Materials
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2024
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IF 4.3
Guodong Han,Ying Zhu,Yong Sun,Jiafu Wang,Shaobo Qu
The sandwich metamaterial based on “honeycomb-like” porous carbon combined ferroferric oxide (Fe3O4) was reported in this paper. By manipulation of the content of carbon and Fe3O4 for adjusting complex and permittivity and permeability, the as-prepared composite P–C-800@Fe3O4 unit cells were used to optimize the electromagnetic composite metamaterials for broadband absorption. For the normal incidence of electromagnetic waves, the sandwich metamaterials demonstrated an excellent broadband absorption in the frequency range of 5–18 GHz and achieved high absorption at low frequency. Meanwhile, the metamaterial structure also can display a wide-angle absorption performance from 0 to 45° for transverse electric (TE) and 0 to 75° for transverse mangentic (TM) mode. The results could contribute potentially to the development of metamaterial absorber applications based on traditional materials, and this research will provide an effective method of lightweight broadband and wide-angle microwave metamaterials for engineering applications in the future.
研究领域:
材料科学
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电磁学
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超材料
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微波工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Zhenxian Chen,Yingying Wang,Zhao Li,Hui Zhang,Ming Wan,Nan Zheng,Bijin Xiong,Jintao Zhu
The cavitation behavior of polypropylene-silica (PP-silica) and high density polyethylene-silica (HDPE-silica) composites with varying silica content during uniaxial tension was investigated via in situ X-ray techniques. The introduction of silica was found to significantly influence the mechanical properties of the materials. Small-angle X-ray scattering (SAXS) was employed to determine the cavitation onset strain and to observe the evolution of cavity structures. Through model fitting, the size evolution of nanoscale cavities at the onset of cavitation was quantitatively characterized. Scanning electron microscopy (SEM) was utilized to examine the morphology before and after stretching, revealing that cavity structures primarily resulted from internal defects in the polymer matrix and interfacial debonding between silica and the polymer. The long axis of the nanoscale cavities at the onset of cavitation was perpendicular to the tensile direction, and further deformation led to the coalescence into micron-sized cavities with the long axis parallel to the tensile direction. Wide-angle X-ray scattering (WAXS) was used to characterize the microscale deformation process of crystals, showing that during stretching, the lamellae reoriented with the angle between their normal direction and the tensile direction gradually decreasing. Several sets of transition strains representing the plastic deformation were used to compare the microscale and macroscale deformation, elucidating the sequence and differentiation between crystal plastic deformation, cavitation, and yield in the two polymer materials. Intriguingly, both PP-silica and HDPE-silica composites exhibited optimal silica additions and initial structural parameters for regulating cavitation behavior. These findings offer significant guidance for the control of internal structures in porous separators in industrial production.
研究领域:
材料科学
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聚合物工程
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Xiaoyu Sun,Jielei Tu,Lei Li,Weinan Zhang,Kai Hu
The wide-angle broadband antireflective coatings (ARCs) were fabricated by a sol–gel method and covered on a soda-lime glass substrate by using dip-coating process. The crystal structural, morphological and antireflection performance of ARCs were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), ultraviolet spectrophotometer (UV–vis), etc. In addition, the optimal experimental parameters of each coating were obtained by optical film design software combined with experimental characterization. The average transmittance of the wide-angle broadband ARCs is 9% higher than 88.90 % of the soda-lime glass substrate in the range of 400−1200 nm. Furthermore, the preliminary evaluation of wear resistance shows that the antireflective performance of the coating was stable before and after the friction test. All the excellent antireflective performance and abrasion-resistance afforded the ARCs with potential application in fields of construction, medical, new energy, military, etc.
研究领域:
材料科学
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光学
·
涂层技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Sheng-Hua Liu,Chun-Kui Hu,Jia-Li Lu,Xiaoxiao Lu,Chun-Xin Lu,Juming Yao,Xia-Chao Chen,Lei Jiang
Photoreceptor cells of vertebrates feature ultrastructural membranes interspersed with abundant photosensitive ion pumps to boost signal generation and realize high gain in dim light. In light of this, superstructured optoionic heterojunctions (SSOHs) with cation-selective nanochannels are developed for manipulating photo-driven ion pumping. A template-directed bottom-up strategy is adopted to sequentially assemble graphene oxide (GO) and PEDOT:PSS into heterogeneous membranes with sculptured superstructures, which feature programmable variation in membrane topography and contain a donor–acceptor interface capable of maintaining electron–hole separation upon photoillumination. Such elaborate design endows SSOHs with a much higher magnitude of photo-driven ion flux against a concentration gradient in contrast to conventional optoionic membranes with planar configuration. This can be ascribed to the buildup of an enhanced transmembrane potential owing to the effective separation of photogenerated carriers at the heterojunction interface and the increase of energy input from photoillumination due to a synergistic effect of reflection reduction, broad-angle absorption, and wide-waveband absorption. This work unlocks the significance of membrane topographies in photo-driven transmembrane transportation and proposes such a universal prototype that could be extended to other optoionic membranes to develop high-performance artificial ion pumps for energy conversion and sensing.
研究领域:
材料科学
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纳米技术
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光电技术
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仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）