Materials
·
2022
·Vol. 15
·期 9
·3334
·
IF 3.748
Shu Yang,Yingwen Wang,Weihong Gao
As a typical representative of natural structural colors, the wings of butterflies living in different zones present colors due to different chromogenic mechanisms. In this work,Papilio maackii, a common species of butterfly living in China, was studied in order to clarify the photophysics of its wing scales. A FESEM was applied to observe the microstructure of the scales, and we found that they have a periodic photonic crystal structure. X-ray photoelectron spectroscopy was applied to clarify the wings’ chemical composition. Additionally, the optical properties of the scales were investigated using a UV-vis-NIR microspectrophotometer. Then, a simplified three-dimensional photonic crystal model was built according to the microstructure of the wing scales, and the plane-wave expansion method was used to calculate the band gap. The correlation between the calculated band gap and the practical reflective spectrum was also established for the wing scales ofPapilio maackii.
研究领域:
生物学
·
光学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Surface Investigation
·
2013
·Vol. 7
·期 4
·745-752
·
IF 0.359
Mikhailov M. M.
Changes in the diffuse reflectance spectra of titanium-dioxide micropowders (initial, modified by nanoparticles, treated with oxidants such as potassium peroxoborate and sodium peroxide, or ultraviolet irradiated in an oxygen atmosphere) in the range 0.3–2.1 μm after irradiation with ultraviolet light, electrons, or protons are analyzed. The general and distinctive features of changes in the spectra in the visible and near infrared regions are revealed and an explanation of the obtained data is proposed.
研究领域:
材料科学
·
光谱学
✓ 已验证
DOI
高影响因子
OPTIK
·
2015
·
IF 0.677
Hongyan Zhang,Zhenhong Jia,Xiaoyi Lv,Rong Wu,Peng Li,Jing Wang
The influence of permeable layer number of porous silicon microcavity (PSM) on the reflectance spectrum has been carried out from both simulations and experiments. The increase of the effective refractive index of the first porous silicon (PS) layer of PSM will causes a blue shift for the reflectance spectrum. With one more layer refractive index increasing, the blue shift becomes less, and it will shift to a higher wavelength when the layer number becomes large enough. This study would be helpful for simple fabrication of highly sensitive, fast responsible biosensors based on the blue shift of reflectance spectrum, and such fabricated Au/PSM substrate of multilayer PS might have a potential to detect minor biomolecules by means of surface state effects.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Kang Yuan,Hao Li,Rui Zuo,Baiqin Gan,Chengjia Xiong
Photonic band gaps of photonic crystals (PCs) are related to the effective refractive indices; therefore, it is quite difficult to detect homologues and isomers with similar reflection indices by PCs. Some researchers have tried to use some complex PCs for detecting homologues and isomers. However, there are few reports in trace detection of isomers (cis–trans isomers) and mixed isomers by using simple amorphous photonic crystals (APCs). Herein, dynamic reflection spectrum (DRS) patterns of APCs are obviously different by changing species of compounds, mixtures of two similar isomers, volatility temperatures, and diameters of SiO2. Isomers with a refractive index difference of only 0.001 and their mixtures could be distinguished based on different DRS patterns of simple APCs. For example, the difference in the refractive indices of cis-3-hexene and trans-3-hexene is only 0.001, and the difference of desorption balance time of APCs is 142 s. The method shows high sensitivity detection in isomers and cis–trans isomers.
研究领域:
光学
·
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Xingjie Su,Linzhao Ma,Guo Tian,Hongzhi Xiao,Qianbiao Du,Hao Li
This study used a conventional solid-state method to synthesize high-performance, pure-phase LiMg 6 AlO 8 ceramics. XRD analysis and Rietveld refinement confirmed that the LiMg 6 AlO 8 ceramics possess rock salt structures with a space group of Fm- 3 m (225). According to the calculation results of the P-V-L theory, the Mg−O bond plays a dominant role in affecting ε r with a contribution of 42.1 %. The intrinsic dielectric properties of ceramics were analyzed using infrared far-infrared reflectance spectroscopy. The samples sintered at 1360°C exhibited excellent microwave dielectric properties: ε r = 9.69, Q×f = 170,430 GHz, τ f = −22.8 ppm/°C, demonstrating their potential for industrial applications.
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
SPECTROSCOPY LETTERS
·
2017
·
IF 0.794
Heyue Wei,Hui Li,Ping Liu,Xin Tao,Changchun Fan,Long Li,Ruoqiu Zhang,Yiping Du
A simple, rapid, sensitive, and selective method was proposed to detect phosgene by solid-phase extraction coupled with ultraviolent diffuse reflectance spectroscopy. First, phosgene reacts with aniline solution to produce N,N′-diphenylcarbamide, then nylon membrane was selected as solid-phase material to enrich N,N′-diphenylcarbamide and separate it from mixture solution. At last, nylon membrane-concentrated N,N′-diphenylcarbamide was measured directly to collect ultraviolent diffuse reflectance spectrum without any elution. Some parameters such as membrane pore, vacuum degree, and volume of sample were optimized. Under the optimal conditions, the relationship between the mass x of phosgene and absorbance y at 257 nm was described in a linear equation of y = 0.0141x + 0.0025 with a squared correlation coefficient of 0.9920, the limit of detection of phosgene was estimated as low as 0.2466 µg. The developed method was evaluated by applying to detect phosgene content in real samples and comparing with aniline in ultraviolet spectrophotometric method, which is adopted by the standard method of China. The relative errors of two methods were between −7.03% and 3.60%, and the relative standard deviations were from 6.55% to 9.31%, which are comparable to the standard method and verified the feasibility of the current method. These results demonstrated that the proposed method could be applied to the detection of phosgene with good accuracy and precision.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Shizhuang Weng,Le Tang,Jinghong Wang,Rui Zhu,Cong Wang,Wen Sha,Ling Zheng,Linsheng Huang,Dong Liang,Yimin Hu,Zhaojie Chu
In this study, reflectance spectroscopy was used to achieve rapid and non-destructive detection of amylase activity and moisture content in rice. Since rice husk can interfere with spectral measurements , spectral data transformation was used to remove the husk interference. Reflectance spectra of rice were transformed by direct standardization, convolutional autoencoder network, and kernel regression (KR). Then, random frog and elliptical envelope were adopted to select effective wavelengths, and partial least squares regression (PLSR) and support vector regression were used to establish analysis models. The optimal transformation was from KR, and PLSR and effective wavelengths of the transformed spectra obtained excellent performance with coefficient of determination of test of 0.6987 and 0.8317 and root-mean-square error of test of 0.3359 and 2.2239, respectively. The result was better than that of the rice spectra and was close to that of the husked rice spectra. When the moisture content was integrated into the regression model of amylase activity, a better result was obtained. Thus, the proposed method can detect amylase activity and moisture content in rice accurately.
研究领域:
食品科学
·
光谱学
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Linzhao Ma,Shucheng Liu,Longxiang Jiang,Pengcheng Zhang,Quanzhang Wen,Qianbiao Du,Hao Li
The La 2 Sn 2 O 7 ceramic was synthesized using the solid−phase reaction method. The crystal structure, sintering characteristics, and microwave dielectric properties of the La 2 Sn 2 O 7 ceramics were studied. XRD analysis shows that La 2 Sn 2 O 7 ceramics possess a pyrochlore structure with a space group of F d 3 ¯ m . As the sintering temperature increases, the ε r and relative density show the same trend of change. The Q × f of ceramics has a strong correlation with the packing fraction. The P−V−L theory shows that La−O and Sn−O bonds have certain effects on the ε r and Q × f . The intrinsic dielectric properties of ceramics were analyzed using infrared reflection spectra. At 1350 °C, La 2 Sn 2 O 7 ceramic obtained the largest relative density and optimum microwave dielectric properties (ε r = 15.65, Q × f = 73,804 GHz and τ f = −18.58 ppm/°C).
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Research
·
2022
·
IF 11.036
Qianqian Fu,Jianping Ge,Chen Chen,Zichen Wang,Fan Yang,Yadong Yin
Expensive instruments and complicated data processing are often required to discriminate solvents with similar structures and properties. Colorimetric sensors with high selectivity, low cost, and good portability are highly desirable to simplify such detection tasks. Herein, we report the fabrication of a photonic crystal sensor based on the self-assembled resorcinol formaldehyde (RF) hollow spheres to realize colorimetric sensing of polar solvents, including homologs and isomers based on the saturated diffusion time. The diffusion of solvent molecules through the photonic crystal film exhibits a unique three-step diffusion profile accompanied by a dynamic color change, as determined by the physicochemical properties of the solvent molecules and their interactions with the polymer shells, making it possible to accurately identify the solvent type based on the dynamic reflection spectra or visual perception. With its superior selectivity and sensitivity, this single-component colorimetric sensor represents a straightforward tool for convenient solvent detection and identification.
研究领域:
材料科学
·
化学传感器
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 3
·1789-1797
·
IF 3.094
Junqi Chen,Ying Tang,Changzhi Yin,Mingyang Yu,Huaicheng Xiang,Chunchun Li,Xianran Xing,Liang Fang
An ultra-low dielectric loss ceramics Mg 2 Ge 0.98 O 4 with olivine structure was fabricated by conventional solid-state route. The phase composition, crystal structure, and microwave dielectric properties were investigated. The phase of Mg 2 Ge 0.98 O 4 is formed to the orthorhombic forsterite structure with a space group Pmnb (62). The dense microstructure and excellent microwave dielectric properties of Mg 2 Ge 0.98 O 4 ceramic were obtained at 1360°C for 4 hours, with relative density ~96.4%, ε r ~ 7.3, Q × f = 112 400 GHz, and τ f ~ −64.6 ppm/°C. The conductive mechanism of Mg 2 Ge 0.98 O 4 in the low frequency (<1 MHz) was studied by the dielectric spectroscopy and the result with E dc = 0.93 eV demonstrates that the defect was contributed to the double ionized oxygen vacancies. The intrinsic dielectric properties of Mg 2 Ge 0.98 O 4 in the microwave region were obtained by infrared reflectivity spectra with ε r ~ 7.13, Q × f = 120 400 GHz. And, acceptable τ f (~+2.6 ppm/°C) of 0.92Mg 2 Ge 0.98 O 4 –0.08CaTiO 3 composite ceramic was obtained by adding the CaTiO3.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 14
·3477
·
IF 3.1
Zeping Li,Huajian Zhou,Gang Xiong,Huifeng Wang,Geng Wang
High-k Ba4Sm28/3Ti18O54ceramics with improved microwave dielectric characteristics were successfully fabricated using the one-step reaction sintering (RS) route. The sintering characteristics, microstructure, crystal structure, infrared reflection spectrum, and microwave dielectric characteristics of Ba4Sm28/3Ti18O54ceramics prepared by the RS route were systematically investigated. Samples prepared by the RS route exhibited single-phase orthorhombic tungsten–bronze structure and dense microstructure at optimum sintering temperature. Compared with the conventional solid-state (CS) process, the Ba4Sm28/3Ti18O54ceramics fabricated by the RS route presented a smaller temperature coefficient (TCF), a higher quality factor (Q × f), and a higher permittivity (εr). The improved microwave dielectric characteristics were highly dependent on the theoretical permittivity, atomic packing fraction, suppression of Ti3+, and Ti-site bond valence. Excellent combined microwave dielectric characteristics (TCF = −7.9 ppm/°C,Q × f= 9519 GHz,εr= 80.26) were achieved for Ba4Sm28/3Ti18O54ceramics prepared by RS route sintered at 1400 °C, suggesting the RS route was a straightforward, economical and effective route to prepare high-performance Ba4Sm28/3Ti18O54ceramics with promising application potential.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LIQUID CRYSTALS
·
2020
·
IF 2.908
Haozhou Huang,Yuehua Cong,Zirui Lin,Baoyan Zhang
Two series of novel side-chain liquid crystal (LC) polysiloxanes grafted with chiral liquid crystalline dimers containing cholesteryl mesogens were synthesised. The chemical structure and LC properties of comonomers and polymers were characterised by FTIR, 1H-NMR, DSC, TGA, POM and XRD. M1 and M2 were chiral nematic (N*) dimers, and M3 was an achiral LC monomer displaying nematic mesophase in a narrow mesomorphic temperature range, while the copolymers exhibited N* mesophase whose mesomorphic temperature ranges were much wider than those of the comonomers. Moreover, the glass transition temperatures and isotropization temperatures of the polymers all decreased with decreasing the dimer components. Reflection spectra showed that Pa series tend to attain wide-band selective reflection at long wavelengths, while Pb series were more potential at short wavelengths with narrow bandwidths. Decreasing the dimer components led the wavelength of the selective reflection to blue shift, which was an abnormal phenomenon in chiral mixture system.
研究领域:
材料科学
·
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）