Article
Engineering, Electrical & Electronic
Sunish Kumar Orappanpara Soman, Abdelkerim Amari, Octavia A. Dobre, Ramachandran Venkatesan
Summary: This paper investigates extending the first-order perturbation theory to second-order to improve the performance of nonlinear compensation in polarization-multiplexed optical fiber communication systems. Numerical simulations and complexity analysis show that the second-order perturbation theory provides better performance and lower computational complexity compared to the first-order perturbation theory in single-channel systems.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Xin Zhu, Boyu Wang, Wan Xiong, Shuyao Zhou, Kai Qu, Jing-Tao Lu, Hongliang Chen, Chuancheng Jia, Xuefeng Guo
Summary: This study focuses on the significance of intermolecular charge transport in electronics and biochemical systems. By designing supramolecular dimer structures, the effects of charge state and energy level on charge transport under nanoconfinement are investigated. It is found that thermally-induced vibrations enhance incoherent tunneling in positively charged systems and the transition between coherent and incoherent tunneling is associated with specific molecular vibration modes.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Materials Science, Multidisciplinary
Yang Gao, Furu Zhang
Summary: The research focuses on the second harmonic generation (SHG) of Dirac or Weyl semimetals under parallel DC electric and strong magnetic fields using the Boltzmann equation approach. The study reveals unique SHG process induced by DC current and provides analytical formulas for the SHG tensor and nonlinear optical susceptibility. The results show strong optical nonlinearity and periodicity in second harmonic conductivity, suggesting potential applications in nonlinear optics for Dirac or Weyl semimetals.
Article
Chemistry, Multidisciplinary
Tongtong Liu, Hengyu Guo, Yanan Chen, Zhengping Zhang, Feng Wang
Summary: In this study, a surface manipulation strategy was used to improve the oxygen evolution reaction (OER) performance of Y2Ru2O7-delta catalyst. Implanting MoOx moieties on the surface of nano Y2Ru2O7-delta enhanced the electron transfer and adjusted the electronic and geometric structure, leading to improved OER performance. The findings of this study provide insights for designing new pyrochlore electrocatalysts and optimizing the performance of related materials through surface engineering.
Article
Optics
Li Wang, Yan-Li Liu, Di He, Sheng-Hui Chen, Quan-Jiang Li, Mei-Shan Wang
Summary: In this study, density functional theory was used to investigate the structures, absorption spectra, charge transfer, and nonlinear optical properties of monomers, dimers, and trimers based on PDIB. The introduction of phenyl substituents resulted in decreased energy gaps, redshifted absorption peaks, enhanced intramolecular charge transfer, and increased intermolecular electron coupling and intermolecular charge transfer. Furthermore, increasing the number of layers led to a decrease in the average nonlinear optical response.
JOURNAL OF LUMINESCENCE
(2022)
Article
Engineering, Electrical & Electronic
Mingliang Xiong, Qingwen Liu, Xin Wang, Shengli Zhou, Bin Zhou, Zhiyong Bu
Summary: This paper proposes an intra-cavity second-harmonic-generation resonant beam communication system to improve energy conversion efficiency. By eliminating echo interference and simplifying system design, the proposed system reduces energy consumption and achieves the same channel capacity level.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Lin Chang, Andreas Boes, Haowen Shu, Weiqiang Xie, Haijin Huang, Jun Qin, Bitao Shen, Xingjun Wang, Arnan Mitchell, John E. Bowers
Summary: Photonic integrated circuits have a wide range of applications, and the development of new second order nonlinear optical waveguide platforms opens up opportunities for low-power optical signal processing. Research on lithium niobate on insulator and aluminum gallium arsenide on insulator has demonstrated ultra-efficient conversion, paving the way for high-performance optical signal processing.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Engineering, Environmental
Simin Jiang, Jianyin Lin, Deli Li, Mengke Li, Yanmei He, Wentao Xie, Jiting Chen, Yiyang Gan, Guo-Xi Yang, Zhihai Yang, Wei Li, Shi-Jian Su
Summary: Intramolecular charge transfer (intra-CT) and intermolecular charge transfer (inter-CT) are two general molecular design strategies for thermally activated delayed fluorescence (TADF) materials. By tuning the doping concentrations, the influence of molecular conjugation on charge transfer can be overcome. The planar molecular skeleton enhances intramolecular electronic coupling, reduces steric hindrance, and shortens intermolecular distance, leading to improved charge transfer efficiency.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Fang Xu, Kun Gong, Dongzhi Liu, Lichang Wang, Wei Li, Xueqin Zhou
Summary: The aggregation of organic molecules plays a crucial role in determining the photoelectric properties of devices. This study investigates the effects of aggregation and solvent regulation on the photovoltaic performance of dye-sensitized solar cells (DSSCs). The results show that the aggregation of two dyes has completely opposite effects on device performance.
Article
Materials Science, Multidisciplinary
Kazuaki Takasan, Takahiro Morimoto, Joseph Orenstein, Joel E. Moore
Summary: Second harmonic generation (SHG) is a fundamental nonlinear optical phenomenon that has been widely studied for both experimental probes of materials and applications in optical devices. This study focuses on the theoretical analysis of SHG in inversion-symmetric Dirac and Weyl semimetals under the influence of a DC current, showing strong SHG effects upon the application of finite current. Experimental estimations suggest that Dirac and Weyl semimetals exhibit significantly higher induced susceptibility values compared to typical nonlinear optical materials.
Article
Instruments & Instrumentation
Zhongshuai Zhang, Bin Guo, Yanyan Huo, Shuyun Wang, Tingyin Ning
Summary: We investigated the third-order optical nonlinearity in indium tin oxide (ITO) films with different grain orientations grown using magnetron sputtering technique. The nonlinear refractive index n2 and nonlinear absorption coefficient beta were measured by the Z-scan method and were found to be significantly influenced by grain orientations. Specifically, ITO films with near pure (222) crystalline orientation prepared at 90 W exhibited the highest values of n2 and beta compared to polycrystalline films prepared at different powers. The results indicate that the third-order optical nonlinearity in ITO films is governed by the crystalline orientation (222), providing guidance for fabricating ITO films with optimized third-order optical nonlinearity for high-performance nonlinear optical devices.
INFRARED PHYSICS & TECHNOLOGY
(2023)
Article
Chemistry, Physical
I. P. Primsa, M. C. Sreenath, V. M. Anandakumar, I. Hubert Joe
Summary: The study investigates the fifth-order optical nonlinearity in an organic dye at low intensity level, revealing a positive fifth-order nonlinear refractive index. The compound exhibits self-defocusing behavior under specific laser excitation, making it a potential candidate for an optical limiter at low power. The nonlinearities in the compound have both thermal and electronic origins, as shown by theoretical and experimental methods.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Optics
Tingyin Ning, Xiuru Yu, Luying Yin, Qingmeng Zhang
Summary: The optical nonlinearity in glass and glass-ceramic containing fermelectric nanocrystals was investigated, showing potential applications for all-optical photonic devices. The values of the third-order and fifth-order nonlinear refractive indices were determined, along with the three-photon absorption coefficient values for the samples.
Article
Engineering, Mechanical
Quankun Li, Xingjian Jing
Summary: This paper presents a novel method based on second-order output spectrum for the precise localization of multiple bolt-loosening faults in complex structures. By considering a more general multi-degree-of-freedom model and a special local tuning mechanism, a novel damage indicator is derived successfully.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Electrical & Electronic
Tao Wang, Can Jiang, Junlong Zou, Hanxu Zhou, Xiao Lin, Hongsheng Chen, Gian Piero Puccioni, Gaofeng Wang, Gian Luca Lippi
Summary: This research introduces a new sensing method based on the second-order autocorrelation measurement of the output of micro- and nanolasers with intensity feedback. The sensing function is implemented through feedback-induced threshold shift, which can be adapted to different laser sizes. Two schemes are proposed to provide quantitative sensing signals and cover a broad range of feedback levels.
IEEE SENSORS JOURNAL
(2021)
Article
Chemistry, Physical
Yue Fang, Ying-Chen Duan, Yun Geng, Zhi-Wen Zhao, Rong-Lin Zhong, Liang Zhao, Run-Han Li, Min Zhang, Zhong-Min Su
Summary: This study investigated the photocyclization reaction and multicolour fluorescence modulation performances of a photochromic spiro-diarylethene derivative using density functionals calculations. The findings suggest that the cyclization reaction may occur at the first excited state (S-1), with a higher photocyclization rate. The contribution of the dihydroacridine fragment to the cyclization reaction at S-1 was suspected to be significant based on electronic structure analysis.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Ming-Liang Sun, Yi-Rong Wang, Wen-Wen He, Rong-Lin Zhong, Qing-Zhi Liu, Shiyou Xu, Jing-Mei Xu, Xiao-Long Han, Xueying Ge, Shun-Li Li, Ya-Qian Lan, Abdullah M. Al-Enizi, Ayman Nafady, Shengqian Ma
Summary: A series of mixed-valence POM-based metal-organic frameworks (MOFs) composites were synthesized by combining the advantages of POMs and catalytic single-metal site Co, showing enhanced electron transfer properties and efficient CO2 reduction performance.
Article
Chemistry, Organic
Guobo Deng, Ronglin Zhong, Jianxin Song, Pui Ying Choy, Fuk Yee Kwong
Summary: This study presents an efficient method for accessing structurally diversified quinolines through a metal-free cascade reaction at 30 degrees C, offering easy manipulation of substituents. Density functional theory calculations suggest that the cyano moiety plays a crucial role in facilitating the early cyclization step in this heteroannulation process.
Article
Chemistry, Physical
Xiangjuan Qi, Ronglin Zhong, Mengmeng Chen, Chunyi Sun, Siqi You, Jianxia Gu, Guogang Shan, Dongxu Cui, Xinlong Wang, Zhongmin Su
Summary: A novel single molecular cage of Ir(III) complex-decorated Zr-MOC has been proposed for CO2 photoreduction, showing high reactivity, selectivity, and apparent quantum yield. The catalytic center is the Ir(III) complex, while the -NH2 in the framework plays a synergetic role in stabilizing the transition state and CO2 adducts, leading to superior performance compared to classical metal-organic framework counterparts.
Article
Chemistry, Physical
Rong-Lin Zhong, Katsunori Suzuki, Makoto Yamashita, Shigeyoshi Sakaki
Summary: The unusual alpha-regioselective and beta-regioselective C(sp(3))-H borylation reactions of NEt3 were investigated using density functional theory calculations. The study revealed that the AlB ligand plays a crucial role in the reaction mechanism. This research is significant for understanding the factors controlling alpha and beta regioselectivity in C(sp(3))-H borylation reactions.
Article
Chemistry, Physical
Man Ho Tse, Rong-Lin Zhong, Fuk Yee Kwong
Summary: In this study, a general Pd-catalyzed Miyaura borylation of sterically hindered aryl chlorides was achieved using a tailor-made phosphine ligand. The success of this reaction demonstrated the possibility of coupling highly sterically congested electrophilic partners and showed good functional group compatibility. The ligand-enabled C-B bond formation could provide fundamental knowledge for developing catalyst systems suitable for other highly sterically hindered cross-coupling reactions.
Article
Chemistry, Multidisciplinary
Kin Boon Gan, Rong-Lin Zhong, Zhen-Wei Zhang, Fuk Yee Kwong
Summary: In this study, a rational design of a new collection of chiral phosphines featuring a C-N axial chirality is presented. These phosphines were successfully applied in the enantioselective synthesis of highly steric hindered tetra-ortho-substituted biaryls. It was found that the carbazolyl framework played a crucial role in facilitating the reaction through a fleeting Pd-N/Pd-pi coordination.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Xiaowu Wang, Jiwen Hui, Minmin Shi, Xinhui Kou, Xiaoxiao Li, Ronglin Zhong, Zhibo Li
Summary: In this study, a one-component Lewis pair strategy was adopted to achieve living propylene oxide polymerization and prepare high-molecular-weight polypropylene oxide. The success of this strategy is attributed to better control and rapid polymerization kinetics, utilizing the unique structures and synergistic effect of the Lewis pairs. Spectroscopic data analysis and density functional theory calculations provided insightful mechanistic understanding of this designed Lewis pair system.
Article
Chemistry, Organic
Tianyi Liu, Kin Boon Gan, Rong-Lin Zhong, Xinwei He, Fuk Yee Kwong
Summary: This study reports a redox-neutral benzylic C-O cyclization under transition-metal-free conditions utilizing the Tf anion as the leaving group. The protocol delivers a series of captivating helical compounds with various functionality in good-to-excellent yields. It is particularly notable that sterically hindered helical compounds are conformationally stable. In addition, bihelical multiple-ring systems potentially useful in material chemistry can also be easily obtained using this method.
Article
Chemistry, Organic
Kaixin Zhang, Jianxiong Xu, Jinxiang Xiao, Ronglin Zhong, Jizhen Li
Summary: A metal and light-free Minisci-type acylation approach was developed for 8-aminoquinoline amides with general primary alcohols under (Bu4NCl)-Bu-t/K2S2O8 system. Unexpected C2-H alkylation can occur for specific benzyl alcohols with strong electron-donating groups. Most N-heterocycles are also compatible for the formation of acylated products. Mechanistic investigation reveals the involvement of chlorine radical in generating ketyl radical from alcohols, followed by nucleophilic carbon-centered radicals addition, deprotonation, and oxidation to form the desired acylation products.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Plant Sciences
Pingping Xiang, Yunnan Zhang, Xiaoyang Qu, Yu Chen, Yijiao Xu, Xingjia Li, Xiao Wei, Xin Hu, Ronglin Zhong, Chao Liu, Fenxia Zhu
Summary: XHXY decoction can ameliorate autoimmunity in GD by inhibiting Tfh cell amplification and Tfr cell reduction, which involves the Keap1/Nrf2 signaling pathway.
JOURNAL OF ETHNOPHARMACOLOGY
(2023)
Article
Chemistry, Organic
Xiao-Xiao Li, Jian-Sen Wang, Xiao-Xia You, Rong-Lin Zhong, Zhong-Min Su
Summary: The Pd-catalyzed borylation of fluorobenzene was investigated theoretically, and it was found that the reaction proceeds through an unprecedented 3 + 6-membered ring transition state. This transition state involves the interaction of one LiHMDS as a ligand and another LiHMDS providing essential Li·N and Li·F interactions, effectively overcoming the destabilization caused by the distortion of the phenyl-F bond.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Jian-Sen Wang, Xiao-Xia You, Rong-Lin Zhong, Zhong-Min Su
Summary: The Ni-0-catalyzed borylation of fluorobenzene mechanism was theoretically investigated using density functional theory (DFT) calculations. It was found that the reaction proceeds through an unprecedented nucleophilic aromatic substitution reaction assisted by an sp(2)-sp(3) diboron complex. The study also compared the catalytic effects of mono- and bisphosphine ligands, finding that Ni-0(dcpe) is more effective. Theoretical analysis revealed the molecular orbital features of the Ni-0-catalyzed Ph-F bond activation via both nucleophilic aromatic substitution and concerted oxidative addition reactions.
Article
Chemistry, Multidisciplinary
Xinwei He, Ruxue Li, Pui Ying Choy, Jiahui Duan, Zhenzhen Yin, Keke Xu, Qiang Tang, Rong-Lin Zhong, Yongjia Shang, Fuk Yee Kwong
Summary: An operationally simple and environmentally friendly method for the modular and regioselective synthesis of (E)-4-(vinyl or aryl or alkynyl)iminochromenes from propargylamines and S-methylated beta-ketothioamides using FeCl3 in undried acetonitrile and air atmosphere is reported. This method exhibits a broad substrate scope and nice functional group compatibility, providing an efficient access to 3,4-disubstituted iminochromenes.
Article
Chemistry, Multidisciplinary
Xiao Wei, Bao Li, Zhiqiang Yang, Ronglin Zhong, Yufei Wang, Yanan Chen, Zeyang Ding, Guangwen Men, Zairan Yang, Houyu Zhang, Bing Yang, Weiqing Xu, Shimei Jiang
Summary: Engineering the preorganization of photoactive units is a significant challenge in solid-state photochemistry research, with potential theoretical and technological implications. By crystallizing a cyanostilbene derivative into two polymorphs with distinct hierarchical architectures, this study demonstrates the possibility of fabricating advanced materials with unique properties through manipulation of molecular organization in the solid state.