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Laser projection proximity transfer for deterministic assembly of microchip arrays at scale

Science China(Technological Sciences) 2022年第9期65卷 2205-2214页

作者： HU JinLong CHEN FuRong BIAN Jing sun ningning WANG KaiXin LING Hong YU HaiYang GAI MengXin XU LiZhi HUANG YongAn State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China Flexible Electronics Research Center Huazhong University of Science and TechnologyWuhan 430074China College of Electronic and Optical Engineering&College of Microelectronics Nanjing University of Posts and TelecommunicationsNanjing 210023China Department of Mechanical Engineering The University of Hong KongHong Kong SAR 999077China

Deterministic assembly techniques that enable programmatic and massively parallel integration of chips are essential for the development of novel electronic systems such as micro LED ***,large-area integration of ultrathin micro-chips with high yield and transfer accuracy remains a great challenge due to the difficulties in selective transfer,adhesion switchability,and transfer ***,a“laser projection proximity transfer(Laser PPT)”technique is presented for the deterministic assembly of microchip arrays at *** of the remarkable features is that the transfer status between the chip and the receiver substrate evolves from the original non-contact mode to contact mode for high-precision transfer,which overcomes the strict requirements of the flatness of stamp and substrate in contact-style transfer,and flight deviation of microchip array in noncontact-style *** feature is the rapid modulation of interfacial adhesion for reliable transfer via the use of thermally expandable microspheres to form microstructures and combining with a laser-induced *** adhesion regulation range is over 20 times without any damage to chip *** results show that the transfer accuracy has been improved substantially with a minimum relative error of~0.5%.Combined with a laser beam projection system,demonstrations of Laser PPT for selective assembly of fragile objects onto challenging non-adhesive/cured surfaces in batch illustrate its potential in the highprecision integration of microscale chips at scale.

关键词： microtransfer printing micro LED display laser lift-off interfacial adhesion

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Flexible multilayer lead-free film capacitor with high energy storage performances via heterostructure engineering

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Journal of Materiomics 2022年第4期8卷 772-780页

作者： ningning sun Jinhua Du Ye Zhao Chunxiao Lu Pei Han Yong Li Qiwei Zhang Xihong Hao Inner Mongolia Key Laboratory of Ferroelectric-Related New Energy Materials and Devices School of Materials and MetallurgyInner Mongolia University of Science and TechnologyBaotou014010China

The immense potential of flexible energy storage materials applied in wearable electronic devices hasstimulated a lot of science researches on manufacturing technology and performance ***, an all-inorganic flexible ferroelectric film with multilayer heterostructure is prepared based onMn doped Bi0.5Na0.5TiO_(3)eBiNi0.5Zr0.5O_(3) (Mn:BNT-BNZ) and Bi0.5Na0.5TiO_(3)eBiZn0.5Zr0.5O_(3) (BNT-BZZ)relaxor ferroelectrics. A win-win situation of breakdown strength and polarization is achieved in theMn:BNT-BNZ/BNT-BZZ multilayer film with the stacking period N - 3, of which energy density and ef-ficiency reach 80.4 J/cm3 and 62.0% respectively. It is proposed that the excellent energy storage per-formances are attributed to the synergistic effect of the electric field amplification effect, interfaceblocking effect and the polarization coupling effect based on the multilayer heterostructure. Moreover,the flexible ferroelectric film exhibits outstanding temperature (25e205 - C), frequency (0.5e5 kHz)stability and antifatigue property (1 108 cycles), and can well maintain stable performance at differenttensile/compressive bending radii (10e5 mm) and even after 104 bending cycles with a fixed bendingradius of 3 mm. This work opens up a promising route to the development of flexible energy storagematerials.

关键词： Energy storage Ferroelectric Flexible Multilayer Heterostructure

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Adult tiger beetles Cicindela gemmata modify their foraging strategy in different hunting contexts

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Insect Science 2023年第6期30卷 1749-1758页

作者： Shumin Wang Panshuai Fei Zifeng Wu Zeyi Luo Yichen Wu ningning sun Yujie Wang Shumei Zi Lifang Gao Bo Du School of Life Sciences Lanzhou UniversityLanzhouChina College of Ecology Lanzhou UniversityLanzhouChina

Predator–prey interaction has long been an interesting item in the research of animal *** that live prey can damage their predators,predators must trade foraging efficiency for safety while hunting,but the extent of this trade-off is not yet *** beetles display diversity in their diets and hunting strategies,and hence,they become an ideal system to address how self-security affects foraging *** addressed this question in captive adult tiger beetles Cicindela *** offering several types of arthropod and plant foods,we confirmed that *** is *** found that *** hunt by either ambushing or chasing their prey,and that they switch between strategies based on differences in the number of prey,the prey status and encounter rate,and the number of *** success increased with the number of prey but decreased with prey encounter *** success decreased as prey body size and encounter rate *** Cicindela gemmata often gave up an attack when it was *** active giving up of hunting may be a consequence of a trade-off between foraging efficiency and ***,it is an adaptive response to the risk of injury when hunting for larger live prey.

关键词： ambush chase foraging strategy hunting success self-security

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Mass transfer techniques for large-scaleand high-density microLED arrays

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International Journal of Extreme Manufacturing 2022年第4期4卷 148-177页

作者： Furong Chen Jing Bian Jinlong Hu ningning sun Biao Yang Hong Ling Haiyang Yu Kaixin Wang Mengxin Gai Yuhang Ma YongAn Huang State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China Flexible Electronics Research Center Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China College of Electronic and Optical Engineering&College of Microelectronics Nanjing University of Posts and TelecommunicationsNanjing 210023People’s Republic of China

Inorganic-based micro light-emitting diodes (microLEDs) offer more fascinating properties and unique demands in next-generation displays. However, the small size of the microLED chip (1–100 µm) makes it extremely challenging for high efficiency and low cost to accurately, selectively, integrate millions of microLED chips. Recent impressive technological advances have overcome the drawbacks of traditional pick-and-place techniques when they were utilized in the assembly of microLED display, including the most broadly recognized laser lift-off technique, contact micro-transfer printing (µTP) technique, laser non-contact µTP technique, and self-assembly technique. Herein, we firstly review the key developments in mass transfer technique and highlight their potential value, covering both the state-of-the-art devices and requirements for mass transfer in the assembly of the ultra-large-area display and virtual reality glasses. We begin with the significant challenges and the brief history of mass transfer technique, and expand that mass transfer technique is composed of two major techniques, namely, the epitaxial Lift-off technique and the pick-and-place technique. The basic concept and transfer effects for each representative epitaxial Lift-off and pick-and-place technique in mass transfer are then overviewed separately. Finally, the potential challenges and future research directions of mass transfer are discussed.

关键词： mass transfer microLED displays transfer printing interfacial adhesion

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PT-symmetry berry phases,topology and PT-symmetry breaking

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Communications in Theoretical Physics 2020年第4期72卷 45-51页

作者： Jinghui Pi ningning sun Rong Lü Department of Physics Tsinghua UniversityBeijing 100084China Frontier Science Center for Quantum Information BeijingChina State Key Laboratory of Low-Dimensional Quantum Physics BeijingChina

We study the complex Berry phases in non-Hermitian systems with parity-and time-reversal(PT)*** investigate a kind of two-level system with PT *** find that the real part of the the complex Berry phases have two quantized values and they are equal to either 0 orΠ,which originates from the topology of the Hermitian *** also find that if we change the relative parameters of the Hamiltonian from the unbroken-PT-symmetry phase to the broken-PT-symmetry phase,the imaginary part of the complex Berry phases are divergent at the exceptional *** exhibit two concrete examples in this work,one is a two-level toys model,which has nontrivial Berry phases;the other is the generalized Su-Schrieffer-Heeger(SSH)model that has physical loss and gain in every *** results explicitly demonstrate the relation between complex Berry phases,topology and PT-symmetry breaking and enrich the field of the non-Hermitian physics.

关键词： PT symmetry Berry phases topology PT symmetry breaking

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基于过氧乙酸处理水中新污染物的研究进展

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河南化工 2024年第5期41卷 25-29页

作者：王梦实林英姿陈静刘成宇孙宁宁曹炼吉林建筑大学市政与环境工程学院吉林长春130118

为了解决新污染物(emerging contaminants,ECs)在地表水和饮用水中威胁人类健康的问题,探讨了过氧乙酸(PAA)处理水中有机污染物的高级氧化技术(AOPs)。活化PAA有多种方式,包括光催化(紫外线UV)、超声活化(US)、过渡金属离子(Fe、Co、Mn... 详细信息

为了解决新污染物(emerging contaminants,ECs)在地表水和饮用水中威胁人类健康的问题,探讨了过氧乙酸(PAA)处理水中有机污染物的高级氧化技术(AOPs)。活化PAA有多种方式,包括光催化(紫外线UV)、超声活化(US)、过渡金属离子(Fe、Co、Mn和Cu)活化等。综述了基于PAA的AOPs去除水中有机污染物的相关研究成果,探讨了联用技术存在的问题与发展前景,为开发活化PAA技术处理水中新污染物提供了参考。

关键词：过氧乙酸活化方式高级氧化有机污染物自由基

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A High-Accuracy Single Patch Representation of Multi-Patch Geometries with Applications to Isogeometric Analysis

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Computer Modeling in Engineering & Sciences 2020年第8期124卷 627-642页

作者： Jinlan Xu ningning sun Gang Xu School of Computer Science and Technology Hangzhou Dianzi UniversityHangzhou310018China

This paper presents a novel approximating method to construct highprecision single-patch representation of B-spline surface from a multi-patch representation for isogeometric *** isogeometric analysis,multi-patch structure is not easy to achieve high continuity between neighboring patches which will reduce the advantage of isogeometric analysis in a *** proposed method can achieve high continuity at surface stitching region with low geometric error,and this technique exploits constructing the approximate surface with several control points are from original surfaces,which guarantees the local feature of the surface can be well-preserved with high *** the proposed approximating method,isogeometric analysis results using the new single-patch can be obtained efficiently compared with the original multi-patch *** examples are presented to illustrate the effectiveness,accuracy and efficiency of the proposed method.

关键词： Isogeometric analysis patch merging multi-patch structure computational efficiency

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Tribological properties and tribomechanism of nickel nanoparticles in-situ synthesized in rapeseed oil

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Friction 2024年第3期12卷 474-489页

作者： Wenya XU Guangbin YANG Shengmao ZHANG Jun XU Yujuan ZHANG Tianhua sun ningning SONG Laigui YU Pingyu ZHANG Engineering Research Center for Nanomaterials Henan UniversityKaifeng 475004China State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China

Nickel(Ni)nanoparticles can be enriched on the surface of iron-based frictional pairs,which provides the possibility to get rid of the competitive adsorption between the polar species of vegetable oil and the surface-active nano-additives *** this paper,nickel acetylacetonate was used as a precursor to in-situ synthesize nickel nanoparticles with an average diameter of about 12 nm in rapeseed oil(RO)as the reducing agent,surface modifier,and solvent as *** tribological properties of the as-synthesized Ni nanoparticles were evaluated with a four-ball tribometer,and their tribomechanism was investigated based on the characterizations of the tribofilm on rubbed steel surfaces by the scanning electron microscopy(SEM),transmission electron microscopy(TEM),and X-ray photoelectron spectroscopy(XPS).It was found that the Ni nanoparticles in-situ prepared in the RO with a mass fraction of 0.3%can reduce the wear scar diameter(WSD)of the steel ball by 36%.This is because,on the one hand,the Ni nanoparticles are adsorbed on the rubbed steel surfaces to repair or fill up the micro-pits and grooves *** the other hand,Ni nanoparticles participate in tribochemical reactions with atmospheric O and steel substrate to form the tribochemical reaction film on the rubbed steel surfaces with the assistance of friction-induced heat and applied normal *** addition,an amorphous carbon film is formed on the rubbed surface via the carbonization of base oil under the catalysis of Ni *** adsorbed Ni layer,the tribochemical reaction film,and the carbon layer comprise a composite tribofilm composed of amorphous carbon,polar fatty acid,metallic nickel,iron oxides,and nickel oxides on the rubbed steel surfaces,which contributes to significantly improving the antiwear ability and load-carrying capacity of the RO for the steel-steel sliding pair.

关键词： nickel(Ni)nanoparticles rapeseed oil(RO) in-situ synthesis tribological properties tribomechanism

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Optimization of energy storage properties in(1−x)Na_(0.5)Bi_(0.5)TiO_(3)-xSr_(0.7)La_(0.2)TiO_(3)-relaxed ferroelectric ceramics

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Journal of Advanced Dielectrics 2023年第1期13卷 25-31页

作者： Ziyue Ma Jianye Zhu Jianhua Wu Yanhua Hu Xiaojie Lou ningning sun Ye Zhao Yong Li Xihong Hao Inner Mongolia Key Laboratory of Ferroelectric-Related New Energy Materials and Devices School of Materials and Metallurgy Inner Mongolia University of Science and Technology BaotouInner Mongolia 014010P.R.China Department of Chemical Engineering Ordos Institute of TechnologyOrdos Inner Mongolia 017000P.R.China Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University Xi’an Shaanxi 710049P.R.China

Ferroelectric materials are considered to be the most competitive energy storage materials for applications in pulsed power electronics due to excellent charge-discharge ***,the low energy storage density is the primary problem limiting their practical *** this study,(1−x)Na_(0.5)Bi_(0.5)TiO_(3)-xSr_(0.7)La_(0.2)TiO_(3)[(1−x)NBT-xSLT]ferroelectric ceramics are found to exhibit excellent energy storage performances through a synergistic *** the SLT concentration increases,the relaxation characteristic increases significantly and the breakdown strength increases dramatically from 150 kV/cm to 220 kV/*** recoverable energy storage density of the _0.55NBT-0.45SLT ceramic is 2.86 J/cm^(3) with an energy storage efficiency of 88%under an electric field of 220 kV/***,the ceramic with x=0.45 mol exhibited excellent energy storage stability in the ranges of 20-180℃(temperature)and 1-125 Hz(frequency).These excellent properties demonstrate the potential of(1−x)NBT-xSLT ceramics when used as dielectric capacitors in pulsed power systems.

关键词： Energy storage ferroelectric lead-free ceramics dielectric microstructure

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高级氧化技术去除水中药物和个人护理品的研究进展

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辽宁化工 2024年第3期53卷 434-438页

作者：孙宁宁林英姿刘成宇翁启暄陈静王梦实曹炼吉林建筑大学市政与环境工程学院吉林长春130118 吉林建筑大学松辽流域水环境教育部重点实验室吉林长春130118

随着人们生活水平的提高,药物和个人护理品(PPCPs)的用量不断增加,常规水处理工艺中对PPCPs的去除效果不佳,导致其在水体中频繁被检出,对生态环境和人体健康产生潜在风险。因此,迫切需要更先进的水处理技术去除PPCPs。介绍了含有PPCPs... 详细信息

随着人们生活水平的提高,药物和个人护理品(PPCPs)的用量不断增加,常规水处理工艺中对PPCPs的去除效果不佳,导致其在水体中频繁被检出,对生态环境和人体健康产生潜在风险。因此,迫切需要更先进的水处理技术去除PPCPs。介绍了含有PPCPs的水质特征,回顾了传统的水处理方法优缺点,重点介绍了高级氧化法去除水中PPCPs的最新动态和研究进展,总结高级氧化法降解PPCPs存在的问题并对未来的发展提出展望。

关键词：高级氧化药物和个人护理品催化剂水污染控制

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