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Ying‐Jie Jia Yi‐Gang Chen Yao Guo Xiao‐Fang Guan Chengbo Li Bingxuan Li Min‐Min Liu Xian‐Ming Zhang 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(48):17354-17358
Excellent nonlinear optical materials simultaneously meet the requirements of large SHG response, phase‐matching capability, wide transparency windows, considerable energy band‐gap, good thermal stability and structure stability. Herein, two new promising nonlinear optical (NLO) crystals LiMII(IO3)3 (MII=Zn and Cd) are rationally designed by the aliovalent substitution strategy from the commercialized α‐LiIO3 with the perfect parallel alignment of IO3 groups. Compared with parent α‐LiIO3 and related AI2MIV(IO3)6, the title compounds exhibit more stable covalent 3D structure, and overcome the racemic twinning problem of AI2MIV(IO3)6. More importantly, both compounds inherit NLO‐favorable structure merits of α‐LiIO3 and show larger SHG response (≈14× and ≈12×KDP), shorter absorption edge (294 and 297 nm) with wider energy band‐gap (4.21 and 4.18 eV), good thermal stability (460 and 430 °C), phase‐matching behaviors, wider optical transparency window and good structure stability, achieving an excellent balance of NLO properties. 相似文献
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张志跃 《数学物理学报(A辑)》2001,21(Z1):647-654
对一类广义神经传播方程构造了一个全离散的Galerkin近似.定义了一种截断误差,并利用一种技巧构造性地得到了近似解的稳定性,从而证明了其收敛性是最优的. 相似文献
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Dr. Shuaijun Pan Rui Guo Dr. Nadja Bertleff-Zieschang Dr. Shanshan Li Dr. Quinn A. Besford Qi-Zhi Zhong Dr. Gyeongwon Yun Dr. Yunti Zhang Dr. Francesca Cavalieri Dr. Yi Ju Dr. Eirini Goudeli Dr. Joseph J. Richardson Prof. Frank Caruso 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(1):281-286
The manipulation of interfacial properties has broad implications for the development of high-performance coatings. Metal–phenolic networks (MPNs) are an emerging class of responsive, adherent materials. Herein, host–guest chemistry is integrated with MPNs to modulate their surface chemistry and interfacial properties. Macrocyclic cyclodextrins (host) are conjugated to catechol or galloyl groups and subsequently used as components for the assembly of functional MPNs. The assembled cyclodextrin-based MPNs are highly permeable (even to high molecular weight polymers: 250–500 kDa), yet they specifically and noncovalently interact with various functional guests (including small molecules, polymers, and carbon nanomaterials), allowing for modular and reversible control over interfacial properties. Specifically, by using either hydrophobic or hydrophilic guest molecules, the wettability of the MPNs can be readily tuned between superrepellency (>150°) and superwetting (ca. 0°). 相似文献
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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2018,130(39):12862-12866
Three‐component mixtures (diblock copolymer/metal ion/oligoligand) can assemble into micellar particles owing to a combination of supramolecular polymerization and electrostatic complex formation. Such particles cover a large range of compositions, but the electrostatic forces keeping them together make them rather susceptible to disintegration by added salt. Now it is shown how the salt stability can be tuned continuously by employing both a bis‐ligand and a tris‐ligand, and varying the ratio of these in the mixture. For magnetic ions such as MnII and FeIII, the choice of the multiligand also affects the ion/water interaction and, hence, the magnetic relaxivity. As an example, MnII‐based nanoparticles with a very high longitudinal relaxivity (10.8 mm −1 s−1) were investigated that are not only biocompatible but also feature strong contrast enhancement in target organs (liver, kidney), as shown by T1‐weighted in vivo magnetic resonance imaging (MRI). 相似文献
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一个复合系统边界反馈的Riesz基性质 总被引:1,自引:0,他引:1
姚翠珍 《数学物理学报(A辑)》2000,20(4):568-576
该文考虑一端固定 ,一端具负荷的梁的振动问题 .证明了线性反馈的闭环系统是一个 Riesz谱系统 ,即系统存在一列广义本征函数列构成状态空间的 Riesz基 .从而系统的谱确定增长条件成立 .在此过程中 ,简单的导出了系统本征值的渐近展开式 .并因此推论出系统的指数稳定性的条件 相似文献
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