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Electrically tunable planar liquid-crystal singlets for simultaneous spectrometry and imaging

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Light(Science & Applications) 2024年第11期13卷 2589-2598页

作者： Zhou Zhou yiheng zhang Yingxin Xie Tian Huang Zile Li Peng Chen Yan-qing Lu Shaohua Yu Shuang zhang Guoxing Zheng Electronic Information School and School of MicroelectronicsWuhan UniversityWuhan 430072China NUS Graduate School National University of SingaporeSingapore 119077Singapore Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and Manipulationand College of Engineering and Applied SciencesNanjing UniversityNanjing 210093China Peng Cheng Laboratory Shenzhen 518055China New Cornerstone Science Laboratory Department of PhysicsUniversity of Hong KongHong KongChina Department of Electrical and Electronic Engineering University of Hong KongHong KongChina Wuhan Institute of Quantum Technology Wuhan 430206China

Conventional hyperspectral cameras cascade lenses and spectrometers to acquire the spectral datacube,which forms the fundamental framework for hyperspectral ***,this cascading framework involves tradeoffs among spectral and imaging performances when the system is driven toward ***,we propose a spectral singlet lens that unifies optical imaging and computational spectrometry functions,enabling the creation of minimalist,miniaturized and high-performance hyperspectral *** a paradigm,we capitalize on planar liquid crystal optics to implement the proposed framework,with each liquid-crystal unit cell acting as both phase modulator and electrically tunable spectral *** with various targets show that the resulting millimeter-scale hyperspectral camera exhibits both high spectral fidelity(>95%)and high spatial resolutions(~1.7 times the diffraction limit).The proposed“two-in-one”framework can resolve the conflicts between spectral and imaging resolutions,which paves a practical pathway for advancing hyperspectral imaging systems toward miniaturization and portable applications.

关键词： crystal planar singlet

Hydrothermal synthesis, structures and properties of metal phosphonates based on m-xylylenediphosphonic acid

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Chinese Science Bulletin 2014年第34期59卷 4720-4727页

作者： Yu Yang Wei Xu Yuanxin Li Meng Liu yiheng zhang Lei Wang Key Laboratory of Eco-chemical Engineering Ministry of Education College of Chemistry and Molecular EngineeringQingdao University of Science and Technology

In this work, a series of new metal phosphonates were hydrothermally synthesized and structurally characterized based on m-xylylenediphosphonic acids(H4L), including[M(H2L)(bpy)](M = Mn 1, Co 2), [MH2L)(phen)](M = Co3, Cu 4), and [Cu2(H2L)2(bpy00)2] 5(bpy = 2,20-bipyridine,phen = 1,10-phenanthroline, bpy00= 4,40-dimethyl-2,20-bipyridine). X-ray diffraction indicated that compounds 1 and2 were isomorphic. Complexes 3 and 4 were shown to crystallize in different space groups but had similar crystallographic units. In the complexes, H4 L was seen to partially deprotonate to afford H2L2-. The H2L2-ligands in 1–4functioned as tetradentate ligands with each phosphonate group adopting bidentate coordination mode with two M centers to generate a 2D layer. In addition, the H2L2-anions in5 functioned as tridentate ligands with one phosphonate group adopting the bidentate mode and another phosphonate group adopti ng the monodentate mode, thus linking three Cu atoms to provide a 1D chain. The IR and thermal stabilities of these compounds were subsequently examined.

关键词：水热合成结构表征膦酸盐金属特性联吡啶 H2L 双齿配位

Trimer formation of 6-methyl-1,3,5-triazine-2,4-diamine in salt with organic and inorganic acids:analysis of supramolecular architecture

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Science China Chemistry 2014年第12期57卷 1731-1737,1-2页

作者： XIAO Zhen Yu WANG Wen Qiang XUE Rui Yu ZHAO Lei WANG Lei zhang yiheng College of Chemistry and Molecular Engineering Qingdao University of Science and Technology

Although the numbers of co-crystals,salts,polymorphs,hydrates,and solvates are growing steadily,trimers that contain both inorganic and organic acids are still very rare in the Cambridge Structural Database(CSD).When 3,5-dihydroxybenzoic acid was crystallized readily with 6-methyl-1,3,5-triazine-2,4-diamine in a 4:3 ratio of ethanol and water by adding a few drops of nitric acid upon slow evaporation in ambient conditions,6-methyl-1,3,5-triazine-2,4-diamine and 3,5-dihydroxybenzoic acid with the nitric acid form of 1:1:1 an inorganic-organic salt formulated as[(C4H8N5+)·(NO3-)·(C7H6O4)].The supramolecular architecture,which is quite elegant and simple,appeared as stacking of a 3D network in *** transfer from the HNO3to 6-methyl-1,3,5-triazine-2,4-diamine N acceptor(triazine N)occurred in the organic salt and led to the ionic heterosynthon in the *** among the–COOH,–OH,NO3–,and–NH–functional groups for the observed hydrogen bond synthon was examined in the *** adduct,recognition among the constituents is established through N–H···O,O–H···N,and O–H···O hydrogen *** agomelatine molecules are linked through the intermolecular hydrogen bonding interactions(O–H···O)to form a 1D *** addition,the nitric acid anions and base cations act as donors and acceptors of hydrogen bonds and interlink,almost to co-planarity,the hydrogen-bonded chains through interchain N–H···O,O–H···N,as well as O–H···O interactions into a 2D sheet *** N–H···O interactions were found to play an important role in the formation of the final 3D *** salt was characterized by elemental analysis,IR,thermogravimetric analysis,and singlecrystal X-ray diffraction,to better understand how intermolecular interactions influence its supramolecular assembly.

关键词： supramolecular hydrogen bonds crystal structure salt

Molecular simulation on carbon dioxide capture performance for carbons doped with various elements

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Energy Storage and Saving 2023年第2期2卷 435-441页

作者： Chen zhang yiheng zhang Tingyu Su Bingzhi Yuan Xinqi zhang Liwei Wang Yongqiang Tian Jiawang Wang Institute of Refrigeration and Cryogenics Key Laboratory of Power Machinery and Engineering of MOEShanghai Jiao Tong UniversityShanghai200240China China-UK Low Carbon College Shanghai Jiao Tong UniversityShanghai201306China College of Smart Energy Shanghai Jiao Tong UniversityShanghai200240China SPIC Xinjiang Energy Chemical CO. LTD.Urumqi830000China SPIC Xinjiang Wucaiwan Power Generation Co. LTD.ChangjiXinjiang Uygur Autonomous Region831100China

Among the different types of CO_(2)capture technologies for post-combustion,sorption CO_(2)capture technology with carbon-based sorbents have been extensively explored with the purpose of enhancing their sorption perfor-mance by doping hetero elements due to the rapid reaction kinetics and low ***,sorption capacity and selectivity for CO_(2)and N 2 on carbon-based sorbents doped with elements such as nitrogen,sulfur,phosphorus,and boron,are evaluated and compared using the grand canonical Monte Carlo(GCMC)method,the universal force field(UFF),and transferable potentials for phase equilibria(TraPPE).The sorption capacities of N-doped porous carbons(PCs)at 50℃were 76.1%,70.7%,50.6%,and 35.7%higher than those of pure PCs,S-doped PCs,P-doped PCs,and B-doped PCs,*** sorption selectivity at 50℃was approximately 14.0,nearly twice that of pure PCs or other hetero-element-doped *** N-doped PCs showed the largest sorption heat at 50℃among all the PCs,approximately 20.6 kJ·mol^(−1),which was 9.7%−25.5%higher than that of the pure PCs under post-combustion ***,with the product purity of 41.7 vol.%−75.9 vol.%for vacuum pressure swing sorption,and 53.4 vol.%−83.6 vol.%for temperature swing sorption,the latter is more suitable for post-combustion conditions than pressure-swing sorption.

关键词： Carbon dioxide capture Post-combustion Active carbon Molecular simulation Grand canonical Monte Carlo(GCMC)

The Chemical State of a Silver-Copper Complex Image Formed during the Electroless Copper Deposition

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Natural Science 2014年第11期6卷 852-858页

作者： yiheng zhang Xingjian Li Zijiang Yang College of Chemistry and Molecular Engineering Qingdao University of Science & Technology Qingdao China

By means of electroless copper deposition method a complex image has been fabricated in a mixture of cupric sulphate and formaldehyde, the surface and subsurface properties of which has been studied in detail by X-ray photoelectron spectroscopy (XPS) combined with sputter depth profiling technique analyzing distribution and chemical state of copper and silver. Depth profiling by XPS in conjunction with Ar+ sputtering shows that the catalytic activity of silver persists, catalyzing reduction of copper. The integral areas of spectra Ag3d after electroless copper deposition for 5 min at different sputtering times demonstrate that the amount of silver at the surface is greater than that in the interior. And then, the quite likely reasonable explanations are provided for the result. Additionally, the chemical shift of Ag3d XPS and deconvolution of Ag3d XPS spectrum have been also analyzed respectively at length.

关键词： Electrochemistry Electroless Copper Deposition Imaging Agents

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分子间相互作用力的直接测量

高分子学报 2009年第10期19卷 973-979页

作者：张义恒王治强张希清华大学化学系有机光电子与分子工程教育部重点实验室北京100084

结合我们近期的研究工作,着重介绍如何将分子组装与单分子力谱相结合,从单分子水平直接研究分子间相互作用力,包括π-π相互作用、多价作用及嵌入作用.在实验中,将一个相互作用单元通过高分子间隔基共价连接到原子力显微镜针尖上,并将... 详细信息

结合我们近期的研究工作,着重介绍如何将分子组装与单分子力谱相结合,从单分子水平直接研究分子间相互作用力,包括π-π相互作用、多价作用及嵌入作用.在实验中,将一个相互作用单元通过高分子间隔基共价连接到原子力显微镜针尖上,并将另一相互作用单元共价修饰到基底上,通过压电陶瓷管的移动获得力与拉伸长度的曲线.高分子柔性间隔基团的引入既可用来作为判别单链拉伸的"内标",又可避免非特异相互作用对待测的特异相互作用的影响.研究表明,结合静态和动态力学谱,不仅能够实现分子间相互作用力的直接测量,而且还可获得解离速率和相互作用的距离等参数.

关键词：单分子力谱原子力显微镜分子间相互作用

Optical properties of stacked liquid crystal superstructures with opposite chirality [Invited]

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Chinese Optics Letters 2024年第6期22卷 158-163页

作者： Lin Zhu yiheng zhang Shijun Ge Peng Chen Yanqing Lu National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and ManipulationCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

Cholesteric liquid crystal (CLC) has been widely used in flat optical elements due to the Pancharatnam–Berry(PB) phase modulation. In order to achieve PB phase modulation for both circular polarizations, it is natural to come up with stacking CLCs with opposite chirality. Here, various optical properties of diverse CLC stacking structures are systematically investigated by numerical calculations. With the thickness of the CLC sublayers becoming smaller, the reflection bandgap splits into three main parts, and the rotatory dispersion gradually becomes negligible. Vector beams provide a more intuitive verification. These results provide theoretical guidance for future studies on stacked chiral anisotropic media.

关键词： cholesteric liquid crystals Pancharatnam–Berry phases chirality vector beams

NF/rGO/Co_3O_4/NiO电极的制备及在超级电容器中的应用

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高等学校化学学报 2017年第11期38卷 2031-2037页

作者：李莹莹张琦张宜恒王磊青岛科技大学化学与分子工程学院青岛266042 青岛科技大学中德科技学院青岛266042

以泡沫镍(NF)为集流体,在优化好的电位、时间和浓度下,将还原氧化石墨烯(rGO)、金属氧化物(Co_3O_4和NiO)直接生长在泡沫镍上,制备了NF/rGO/Co_3O_4和NF/rGO/Co_3O_4/NiO电极.运用三电极体系对电极材料进行了恒流充放电(GCD)和交流阻抗(... 详细信息

以泡沫镍(NF)为集流体,在优化好的电位、时间和浓度下,将还原氧化石墨烯(rGO)、金属氧化物(Co_3O_4和NiO)直接生长在泡沫镍上,制备了NF/rGO/Co_3O_4和NF/rGO/Co_3O_4/NiO电极.运用三电极体系对电极材料进行了恒流充放电(GCD)和交流阻抗(EIS)等测试.结果表明,复合材料NF/rGO/Co_3O_4/NiO具有较高的比容量(电流密度为2 A/g时,比容量达到1188.6 F/g)和较好的循环稳定性(2000周充放电后,稳定性达到80.5%).该材料还具有较高的倍率性能,当电流密度由2 A/g增至12 A/g时,倍率性能仍能达到75.7%.

关键词：超级电容器电化学沉积还原型氧化石墨烯金属氧化物

加压密闭氧化石墨烯/水性聚氨酯纳米复合材料的制备及阻燃性能

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高分子材料科学与工程 2015年第3期31卷 163-168页

作者：胡静李兴建张峰孙道兴张宜恒青岛科技大学环境与安全工程学院山东青岛266042

采用改进的Hummers法对可膨胀石墨进行加压密闭氧化处理制备了氧化石墨烯(GO),并利用X射线衍射分析、紫外可见吸收光谱和透射电镜对其进行了表征。利用原位乳化法制备了氧化石墨烯/水性聚氨酯(GO/WPU)纳米复合材料。研究了GO含量对GO/WP... 详细信息

采用改进的Hummers法对可膨胀石墨进行加压密闭氧化处理制备了氧化石墨烯(GO),并利用X射线衍射分析、紫外可见吸收光谱和透射电镜对其进行了表征。利用原位乳化法制备了氧化石墨烯/水性聚氨酯(GO/WPU)纳米复合材料。研究了GO含量对GO/WPU纳米复合材料的稳定性、形态、热降解性能和阻燃性能的影响。Zeta电位和扫描电镜的研究表明,GO在GO/WPU纳米复合材料中具有良好的稳定性和分散性。热失重分析结果表明,和纯WPU相比,GO/WPU纳米复合材料的热稳定性略有降低,但800℃时含量2%GO的纳米复合体系的残炭量从0.99%增大到2.90%。锥形量热仪分析结果表明,随着GO在GO/WPU纳米复合材料中的含量增大,材料的阻燃抑烟性能逐渐增强。当GO的含量为2%时,和纯WPU相比,GO/WPU纳米复合材料的峰值热释放速率、总释放热、总烟释放以及烟因子分别降低了34%,19%,27%和43%。

关键词：氧化石墨烯原位乳化法水性聚氨酯阻燃性能抑烟性能