NANOTECHNOLOGY
·
2018
·Vol. 29
·期 17
·175502
·
IF 3.404
Hui Pan,Zhixin Chen,Shenmin Zhu,Chun Jiang,Di Zhang
Nanoparticles, having the ability to self-assemble into an ordered structure in their suspensions, analogous to liquid crystals, have attracted extensive attention. Herein, we report a new type of colloidal gel with an ordered crystal structure assembled from 1D and 2D nanoparticles. The material has high elasticity and, more interestingly, it shows significant photoelasticity. Its refractive index can be tuned under external stress and exhibits an ultra-wide dynamic range (Δn) of the order of 10−2. Due to the large Δn, the material shows an extremely high strain sensibility of 720 nm/ε, an order of magnitude higher than the reported ones.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
Coatings
·
2020
·Vol. 10
·期 1
·56
·
IF 2.436
Guohan Gao,Danbo Mao,Renkui Jiang,Zhiwei Li,Xin Liu,Baiping Lei,Jiang Bian,Shibin Wu,Bin Fan
Optical polyimide (PI) membranes have been increasingly attractive in optoelectronic substrate and optical element material applications. Controlled stress distribution is very important to optical PI membrane-based optics. However, nondestructive absolute stress measurement inside optical PI membranes remains challenging. In this letter, we adopted the stress birefringence method to experimentally investigate the correlation between stress and retardation in uniaxially, biaxially, and circularly stretched PI membranes. The calculated value of the photoelastic coefficient was found to be around 400 nm/Mpa·cm. A theoretical model was established where the retardation angle is the negative arctan of the principal stress ratio in the biaxially stretched membrane. We also found that the average retardation angle is an important parameter for evaluating the uniformity of stretching force in the circularly stretched membrane. This work provides a better understanding of the stress birefringence measurement of membrane materials.Keywords:optical polyimide membrane;stress analysis;photoelastic property;stress birefringence
研究领域:
光学材料
·
力学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 24
·2201117
·
IF 15.153
Shikun Zhao,Jiangman Sun,Zhen Qin,Yufeng Li,Hao Yu,Guan Wang,Xinggui Gu,Kai Pan
White-light emitting elastomers (WLEEs) based on stimuli-responsive aggregation-induced emission (AIE) and regulated Förster resonance energy transfer (FRET) have aroused increasing attention due to the demands for wearable optoelectronic devices. Herein, the blue and orange AIEgens with different environmental sensitivities are synthesized and then encapsulated on both sides of nanofibers via side-by-side electrospinning aiming to achieve the Janus WLEEs. After regulating the blue-orange AIEgens ratio, efficient and stable white light emission with a CIE coordinate of about (0.33, 0.31) is achieved at a blue-orange AIEgens mass ratio of 3:1. Besides, the Janus nanofibers (Janus-NFs) also present super stretchability with elongation at the break over 150% and tensile strength close to 7 MPa. The sensitivity of fluorescence for Janus-NFs to its stretching deformation is used to visualize the evolution of the microstructure of nanofibers during stretching. Moreover, the Janus-NFs are also sensitive to HCl and NH 3 , of which the fluorescence color would change under HCl and NH 3 fuming above 2 and 57 ppm in air, respectively. The promising applications of the white light Janus-NFs in smart fabrics, warning sensors, and anti-counterfeiting packaging are demonstrated. This finding provides an efficient strategy for achieving wearable WLEEs with multiple functionalities, promoting the development of wearable devices.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MEASUREMENT SCIENCE and TECHNOLOGY
·
2013
·Vol. 24
·期 8
·085010
·
IF 1.435
Shi Qun Hua,Ying Luo
Luminescent photoelastic coating (LPC) methods are used to measure the full-field shear strain and its principal direction. These methods apply a liquid LPC onto the surfaces of the structures to be measured. To correct the effects of coating thickness non-uniformity on the quantitative shear strain measurements, a non-contact method is proposed for coating thickness measurements. The proposed method establishes a linear calibration curve between the thickness and the luminescent signal intensity of the test coating. The results show that the linear calibration curve of the intensity and the thickness of the LPC can be obtained by incorporating an appropriate concentration of the luminescent dye into the photoelastic coating. The correlation coefficient of this linear calibration curve is more than 0.999.
研究领域:
力学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2014
·Vol. 20
·期 40
·12924-12932
·
IF 5.696
Yujing Zuo,Haifeng Lu,Lei Xue,Xianming Wang,Lianfeng Wu,Shengyu Feng
Graphical Luminescent elastomers : The novel crosslinking in poly(dimethylsiloxane) networks prepared by easy thiol–ene “click” chemistry has been studied as well as their elastomeric character. The europium poly(dimethylsiloxane)-based elastomer luminophores exhibit intense red light at 617 nm under UV excitation at room temperature (see figure). Side-chain vinyl poly(dimethylsiloxane) has been modified with mercaptopropionic acid, methyl 3-mercaptopropionate, and mercaptosuccinic acid. Coordinative bonding of Eu III to the functionalized polysiloxanes was then carried out and crosslinked silicone elastomers were prepared by thiol–ene curing reactions of these composites. All these europium complexes could be cast to form transparent, uniform, thin elastomers with good flexibility and thermal stability. The networks were characterized by FTIR, NMR, UV/Vis, and luminescence spectroscopy as well as by scanning electron microscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy. The europium elastomer luminophores exhibited intense red light at 617 nm under UV excitation at room temperature due to the 5 D 0 → 7 F 2 transition in Eu III ions. The newly synthesized luminescent materials offer many advantages, including the desired mechanical flexibility. They cannot be dissolved or fused, and so they have potential for use in optical and electronic applications.
研究领域:
材料科学
·
光学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Hang Han,Xiao Liu,Jiahuan Zhang,Lingna Su,Zhiqiang Li
We here report a Yb-containing Near-Infrared hybrid elastomer with anisotropic mechanical behavior as well as anisotropic luminescent performance, which is constructed by aligning the superparamagnetic nanoparticle coated alumina (Fe/Al 2 O 3 ) platelets with a magnetic field, then the oriented structure is fixed by in situ evaporation. Because the mechanical reinforcement of aligned Fe/Al 2 O 3 platelets to the polymeric elastomer is anisotropic, the mechanical strength parallel to the magnetic field is much higher than that of perpendicular to the magnetic field. Meanwhile, the hybrid elastomer also shows anisotropic NIR luminescence behavior, since the “shading effect” of the aligned Fe/Al 2 O 3 platelets on the Yb 3+ emitting centers is orientation-dependent. The method we report here may have great potentials in anisotropic sensing and physiological signal transduction , etc., which are essential for electronic skin and smart actuator.
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
危险品化学品经营许可证（带存储）