APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jingyu Bi,Benli Du,Zihao Guo,Zhihao Sun,Guangshen Li,Jianshu Wang,Ying Sha,Lei Qian
High negative permittivity of most metacomposites has significant limitations for various applications, so design of novel metacomposites with weakly negative dielectric constants still is a critical challenge. In this work, activated carbon felt-polyaniline (ACF-PANI) metacomposites with high compressibility have been prepared through in-situ polymerization of PANI on ACF, and the effect of PANI polymerization on the dielectric properties of the ACF-PANI metacomposites has been investigated. Adjusting the in-situ polymerization time can precisely control the loading of PANI on ACF, thereby achieving controllable negative permittivity. By optimizing the polymerization time to 240 min, we have successfully achieved a weak negative permittivity of approximately −30 from 50 kHz to 1 MHz, and the dispersion of ACF-PANI 240 is only 26. This is attributed to the unique protonic conduction of PANI, which dilutes the carrier concentration in the metacomposite material and enhances the carrier mass, thereby suppressing plasma the oscillations. Moreover, the negative permittivity of the compressible ACF-PANI metacomposites could be dynamically tuned based on its deformation, and the change in negative permittivity (Δε’/ε’) exhibits a clear linear correlation with the strain. This work provides a novel approach for the fabrication of low frequency dispersion and weak negative permittivity metacomposites.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Aochen Du,Xingke Zheng,Genzhuang Li,Yun Ye,Enguo Chen,Sheng Xu,Tailiang Guo
The potential of organic-inorganic hybrid perovskites, owing to their distinct photoelectric attributes and boosted photoluminescence stability, has garnered substantial attention. Despite comprehensive examinations of the synthesis and optical characteristics of FAPbBr 3 crystals, the understanding of their microstructure's implication on photoelectric applications, their electronic configuration, and electron-phonon interplay remains vague. In this study, we detailed the electronic configuration, phonon dispersion, and vibrational properties using density functional theory. We further calculated the formation enthalpy stability diagram. Characterization and calculation of the crystalline structure were accomplished via Rietveld refinement. Phonon dispersion curves, as well as total and partial phonon densities of states, were also calculated. The theoretical results align well with experimental Fourier infrared and Raman spectra. Beyond elementary characterization, we explored the photoelectric qualities of FAPbBr 3 crystals, thereby reaffirming the outstanding photoelectric attributes and extensive application potential. A non-contact fixed-point lighting device was designed based on the principle of electromagnetic induction coils, which proved the uniformity of crystal luminescence. According to the first principle, FAPbBr 3 possesses a Poisson ratio of 0.32, indicative of high flexibility, emphasizing their superb photoelectric characteristics and vast application scope.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2024
·
IF 16.8
Jiawei Ding,Houjiang Liu,Chuangchuang Gong,Jin Cui,Yijing Zhang,Hongwei Cong,Chunnian He,Naiqin Zhao,Chunsheng Shi,Fang He
With the boom in 5 G technology comes widespread concern about electromagnetic (EM) interference and the safe use of electronics. Conventional electromagnetic wave (EMW) absorbing materials in the form of coatings are often inflexible and poorly adapted to different EM environments. Diversified application scenarios require EMW absorbing materials with a wide absorption band and multifunctional properties. Herein, the frequency dispersion (FD) requirements of the EM parameters of the broadband absorber in different frequency bands are determined by EM simulation. Based on the dominant role of interface polarization on FD, we designed different types of heterogeneous interfaces to meet the needs of strong FD in the low-frequency band and weak FD in the high-frequency band. Through the optimized design of heterogeneous interfaces, CC@ZnO/ZnS composites exhibit excellent EMW absorption performance, achieving flexible, ultrathin (2.1 mm), ultralight (10 wt%), and broadband (7.02 GHz), which is superior to EMW absorbing materials of similar compositions. In addition, the composites have good piezoelectric/inverse piezoelectric properties, which can convert EM energy into mechanical energy while absorbing EMW, thus realizing applications in multifunctional fields such as sensors, controllers and energy converters. More noteworthy is the sample's highly efficient thermal insulation, flame retardant and anti-frosting properties, demonstrating important advantages for service in harsh environments. Therefore, CC@ZnO/ZnS composites not only have good practical application characteristics while realizing broadband absorption, but also are expected to achieve multifunctional applications in different fields.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
iScience
·
2022
·
IF 6.107
Zhanfeng Liu,Tongrui Li,Bo Zhang,Mukhtar Lawan Adam,Wen Zhu,Yuliang Li,Sheng Wang,Yunbo Wu,Hongen Zhu,Dengfeng Cao,Qilong Cui,Shengtao Cui,Yi Liu,Shuangming Chen,Zhe Sun,Li Song
The non-symmorphic crystal symmetry protection in the layered topological semimetal Nb 3 SiTe 6 can generate exotic band crossings. Herein, high-quality Nb 3 SiTe 6 single crystal was synthesized via chemical vapor transport. The lattice structure of Nb 3 SiTe 6 was characterized by scanning transmission electron microscopy, X-ray diffraction, core-level photoemission, and Raman spectroscopies. Angle-resolved photoemission spectroscopy was used to reveal its topological properties by presenting band structures along different high-symmetry directions. Our data show that nontrivial band features coexist in Nb 3 SiTe 6 , including an hourglass-type dispersion formed by two bands along the S-R high-symmetry line, two node lines along the S-X path and the S-R-U path, respectively. These results provide a context for the understanding and exploration of the exotic topological properties of Nb 3 SiTe 6 .
研究领域:
凝聚态物理
·
材料科学
✓ 已验证
DOI
高影响因子
Kuwait Journal of Science
·
2023
·
IF 1.4
Sewgil Saaduldeen Anwer
The current study aimed to determine the major and minor elements in different algal species using energy dispersive x-ray fluorescence (EDXRF). Eight microalgae were isolated, and the dry powder of biomass was pressed for EDXRF. The results showed all chemical compositions in each of the isolates. The major elements were detected as Ca, K, Cl, Si, Mg, and Mn, respectively, with high concentrations in percentages for most algal species including Chara hispida, Chara spp , Chlorella vulgaris, Chlorella spp , Chlorella spp , and Spirogyra turfosa. The minor elements with low percentages were detected as Mn, S, Fe, Al, P and Sr. Whereas the major elements for Spirulina platensis and Nostoc punctiforme were detected as Fe, K, S, the minor elements were seen to include Ca, Cl, Si, Mg, and Mn. There are very few studies that determine the elements in microalgae with EDXRF, which is a rapid, easy method to determine what components and in what quantities they are contained to be used (no chemical pre-treatments are required). Algae contain elements like iron, and calcium, which are vital microelements for dietary intake and metabolism in humans. Algae could be useful if further studies are done on the efficiency of microalgae for calcium and iron absorption in human subjects.
研究领域:
生物学
·
环境科学
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2024
·
IF 9.8
Mengxuan Niu,Yijin Wang,Liting Duan,Rui Sun,Renjie Zhou
The Compact Morpho-Molecular Microscopy (CM 3 ) is proposed and demonstrated for multi-functional imaging and characterization of living cells and material structures by simultaneously offering quantitative phase imaging (QPI), dispersion characterization, and fluorescence imaging. The compactness and stability of CM 3 are realized by propagating lasers of different wavelengths in specially treated optical fibers and fiber-based beam splitters and wavelength division multiplexers, as well as simplifying the detection scheme through Fourier-space multiplexing and implementing a single camera for both QPI and fluorescence imaging. Quantitative phase maps of two wavelengths are retrieved from a multiplexed interferogram, and a synthesized wavelength phase map is derived to guide the height profiling of samples with extended depth. With the wavelength resolved phase maps, a physical model is derived to obtain sample dispersion parameters, which further enables us to quantify the hemoglobin concentration of red blood cells in real time. By inserting an appropriate emission color filter, fluorescence imaging is realized using the same camera, which significantly broadens the cell imaging applications of CM 3 . As a cost-effective and multifaceted imaging method, CM 3 may find many promising applications in live-cell imaging and material characterization.
CAS / MDL:
研究领域:
生物医学工程
·
显微成像
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Yi-Gang Chen,Meiling Xing,Yao Guo,Zheshuai Lin,Xiujun Fan,Xian-Ming Zhang
Beryllium (Be) has high ionization energy (9.32 eV) with the greatest degree of covalency in the group IIA elements, and BeO4 tetrahedra (and BeO3 triangles) with covalent character are generally presented in beryllates. An unprecedented BeO6 trigonal prism with ultralong Be–O bonds as well as a BeO4 common tetrahedron is discovered in a new deep ultraviolet crystal Li13BeBe6B9O27 (LBeBBO) with a ∞2[Be6B9O33] double-layer framework. The BeO6 unit and its bond character are verified by an isostructural crystal Li13(Mg0.45Be0.55)Be6B9O27, while the orbital theory and charge density difference further clarify the ionic character of the BeO6 unit. Phonon dispersion confirms the structural stability of LBeBBO.
研究领域:
材料科学
·
晶体学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Engineering
·
2022
·
IF 12.834
Xiaoping Wang,Weiwei Dong,Peng Zhang,Haoqi Tang,Lanting Zhang,Tieying Yang,Peng Liu,Hong Wang,X.-D. Xiang
High-throughput powder X-ray diffraction (XRD) with white X-ray beam and an energy-dispersive detector array is demonstrated in this work on a CeO 2 powder sample on a bending magnet synchrotron beamline at the Shanghai Synchrotron Radiation Facility (SSRF), using a simulated energy-dispersive array detector consisting of a spatially scanning silicon-drift detector (SDD). Careful analysis and corrections are applied to account for various experimental hardware-related and diffraction angle-related factors. The resulting diffraction patterns show that the relative strength between different diffraction peaks from energy-dispersive XRD (EDXRD) spectra is consistent with that from angle-resolved XRD (ARXRD), which is necessary for analyzing crystal structures for unknown samples. The X-ray fluorescence (XRF) signal is collected simultaneously. XRF counts from all pixels are integrated directly by energy, while the diffraction spectra are integrated by d -spacing, resulting in a much improved peak strength and signal-to-noise (S/N) ratio for the array detector. In comparison with ARXRD, the diffraction signal generated by a white X-ray beam over monochromic light under the experimental conditions is about 10 4 times higher. The full width at half maximum (FWHM) of the peaks in q -space is found to be dependent on the energy resolution of the detector, the angle span of the detector, and the diffraction angle. It is possible for EDXRD to achieve the same or even smaller FWHM as ARXRD under the energy resolution of the current detector if the experimental parameters are properly chosen.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Zhengqi Tan,Xueqing Han,Wenhao Guo,Xingyue Fang,Zhouhang Lei,Jungen Chen,Liangbin Li
The quarter-wave plate (QWP), utilized in the visible range, often exhibits significant extraordinary wavelength dispersion and is essential for enhancing the imaging quality of new display devices. However, current design strategies frequently encounter limitations in physical or optical properties, restricting their application potential. We proposed a design strategy based on polyvinyl alcohol (PVA) to obtain an adjustable extraordinary wavelength dispersion materials through a simple reaction. The biphenyl side group offers orientation perpendicular to the main chain, providing suitable negative birefringence, which facilitates our design based on birefringence dispersion control (BDC) methods. We synthesized materials varying degrees of acetalization and regulated their retardation values and wavelength dispersion through uniaxial stretching the prepared films. The film with a particularly wide wavelength dispersion range in the wavelength range of 400–800 nm is obtained, which provides an excellent basis for the fabrication of wideband quarter-wave plates. We proposed a molecular design that enables wide-range wavelength dispersion regulation and investigated the contribution of stretching conditions. This provides a theoretical support and design basis for the subsequent work to prepare films close to the ideal quarter-wave plate.
研究领域:
材料科学
·
光学工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2021
·
IF 6.057
Yunhe Yang,Yang Yang,Shuangshuang Wang,Huihui Li,David D.Y. Chen
The formation of G-quadruplex (G4) structures in oncogenic G-rich promoter regions are implicated in their biological functions, especially the inhibition of transcription. The binding of cations is thought to contribute to the stabilization of the G4 formation and competition against the duplex formation in the genomic sequence. Furthermore, it might affect the recognition of DNA-binding proteins. Therefore, measuring the interaction between G4 DNA and cations in a free solution environment is critical for evaluating G4 DNA biological functions. However, how binding to cations (K + and NH 4 + ) affects the folding equilibrium of the G4 structure remains unclear. In this work, a Taylor dispersion analysis (TDA) method using a capillary electrophoresis (CE) instrument was established for the quantitative characterization of the cation-dependent G4 formation in the human c-KIT oncogene promoter region, as well as diffusivities and hydrodynamic radii of DNA variations before and after folding. Our results showed that both K + and NH 4 + can induce the random-coiled c-KIT DNA to unfold and form a more unstretched intermediate state and then fold into tightly structured G4s with smaller size. The G4 size induced by NH 4 + was smaller than that induced by K + ions, though these two cations induced the c-KIT G4 DNA formation with similar binding constants (order of magnitude around 10 6 M −1 ). The TDA method can be widely used for rapid structural analyses of trace amounts of DNA mixtures, which effectively differentiate DNA variations or DNA-ligand complex conformations.
研究领域:
生物化学
·
分子生物学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2016
·Vol. 182
·期 1
·261-275
·
IF 1.606
Jiang Cheng,Song Jinzhu,Cong Hua,Zhang Junzheng,Yang Qian
A novel β-1,3-glucanase gene, designated Ccglu17A , was cloned from the biological control fungus Chaetomium cupreum Ame. Its 1626-bp open reading frame encoded 541 amino acids. The corresponding amino acid sequence showed highest identity (67 %) with a glycoside hydrolase family 17 β-1,3-glucanase from Chaetomium globosum . The recombinant protein Ccglu17A was successfully expressed in Pichia pastoris , and the enzyme was purified to homogeneity with 10.1-fold purification and 47.8 % recovery yield. The protein’s molecular mass was approximately 65 kDa, and its maximum activity appeared at pH 5.0 and temperature 45 °C. Heavy metal ions Fe 2+ , Mn 2+ , Cu 2+ , Co 2+ , Ag + , and Hg 2+ had inhibitory effects on Ccglu17A, but Ba 2+ promoted the enzyme’s activity. Ccglu17A exhibited high substrate specificity, almost exclusively catalyzing β-1,3-glycosidic bond cleavage in various polysaccharoses to liberate glucose. The enzyme had a Km of 2.84 mg/mL and Vmax of 10.7 μmol glucose/min/mg protein for laminarin degradation under optimal conditions. Ccglu17A was an exoglucanase with transglycosylation activity based on its hydrolytic properties. It showed potential antifungal activity with a degradative effect on cell walls and inhibitory action against the germination of pathogenic fungus. In conclusion, Ccglu17A is the first functional exo-1,3-β-glucanase to be identified from C. cupreum and has potential applicability in industry and agriculture.
研究领域:
微生物学
·
酶学
·
分子生物学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IEEE SENSORS JOURNAL
·
2024
·
IF 4.3
Bolun Tang,Yunbo Shi,Canda Zheng,Kuo Zhao
To date, various materials have been widely investigated for developing highly selective and sensitive sensors for NO
2
, a common hazardous gas. However, the associated NO
2
-gas-sensor fabrication methods exhibit several drawbacks, which hinder the development of NO
2
-sensitive gas sensors with excellent selectivity. In this study, NiP
2
-Ni
2
P polymorphs with observable heterointerfaces were prepared using metalloid NiP
2
and metallic Ni
2
P for NO
2
gas sensing, and the characteristics of the synthesized polymorphs were evaluated through X-ray diffraction and energy-dispersive spectrometry. At 160 °C, the fabricated sensor exhibited a response of 1.5%-93.14% for NO
2
gas over a concentration range of 0.5-60 ppm; its response and recovery times were 16 and 55 s, respectively. In addition, the sensor exhibited excellent NO
2
selectivity and long-term stability. Density functional theory calculations revealed the adsorption sites of NO
2
molecules on NiP
2
, and the gas-sensing mechanism was elucidated. The findings of this study establish NiP
2
-Ni
2
P, which is currently employed as an outstanding electrocatalyst for hydrogen evolution, as a potential NO
2
sensor platform with excellent selectivity and efficient recovery characteristics.
研究领域:
材料科学
·
化学传感器
·
环境监测
·
理论化学
✓ 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）