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Liquid metal hydraulics paradigm:Transmission medium and actuation of bimodal signals

Science China(Technological Sciences) 2022年第1期65卷 77-86页

作者： FU JunHeng GAO JianYe QN Peng LI DongDong yu dehai SUN Peng HE ZhiZhu DENG ZhongShan LIU Jing Beijing Key Laboratory of Cryo-Biomedical Engineering and Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China Department of Biomedical Engineering School of MedicineTsinghua UniversityBeijing 100084China Department of Vehicle Engineering College of EngineeringChina Agricultural UniversityBeijing 100083China

In this article,room temperature gallium-based fluids(RTGFs)with unique thermal and conductive properties are proposed as a transmission fluid for the force carrying medium of hydraulics,which rectify the lack of the multi-functional hydraulic roles of liquid metal(LM).The typical physical properties of RTGFs and comparative conventional hydraulic fluids(commercial hydraulic oil and deionized water),such as thermal stability and rheological characteristics,are *** and numerical methods,then,were adopted to clarify the force transmission performance of RTGFs and commercial hydraulic oils,as well as the influence of temperature fields on the viscosity of *** results disclosed that the advantages of inherent flame resistance,wide liquid temperature range,and the viscosity changing slightly with temperature made RTGFs potential in finding efficient application in the hydraulics as new working ***,for illustration,the rigid and flexible actuators driven by RTGFs were designed as hydraulic fluid and demonstrated their capabilities in grasping objects with various shapes and weights,*** the tunable stiffness of such a flexible actuator was enabled via the solid-liquid phase change of ***,a frequency-adjustable antenna was manufactured and showcased owing to the introduced transformable electromagnetic behaviors of ***,the gallium-based LM fluids with thermoelectrical and mechanical multimodal signal medium would serve as a potential candidate for future complex multifunctional signal transmission systems.

关键词： hydraulic system LM force transmission phase change controllable antenna

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Preparation of hydrophobic transparent paper via using polydimethylsiloxane as transparent agent

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Journal of Bioresources and Bioproducts 2020年第1期5卷 37-43页

作者： Feixiang Guan Zhaoping Song Furong Xin Huili Wang dehai yu Guodong Li Wenxia Liu State Key Laboratory of Biobased Material and Green Papermaking Qilu University of TechnologyShandong Academy of SciencesJinan 250353China

Transparent paper with good hydrophobicity and flexibility was expected to act as an alternative substrate in fabrication of flexible ***,conventional paper made of cellulose fibers was opaque and hydrophilic without undergoing special ***,cellulose fiber paper was treated by impregnating with hydrolyzed tetraethyl orthosilicate(TEOS)followed by coating with hydrophobic polydimethylsiloxane(PDMS)to prepare hydrophobic transparent *** results showed that silica nanoparticles produced by the TEOS hydrolysis improved the paper transparency to some extent,increased the paper thermal stability,but still remained the hydrophilicity of *** the paper was further coated with the PDMS and the PDMS was consolidated,the paper became clearly transparent and *** processed paper had a transmittance of more than 90%at 550 *** water contact angle of the paper reached about 110°.This work provided a new approach for the fabrication of hydrophobic transparent paper with conventional cellulose fiber paper.

关键词： Transparent paper Cellulose fiber paper Hydrophobicity Tetraethyl orthosilicate(TEOS) Polydimethylsiloxane

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邻近桥桩地铁盾构隧道变形规律及力学行为分析

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应用基础与工程科学学报 2019年第3期37卷 545-552页

作者：于德海张涛大连海事大学道路与桥梁工程研究所辽宁大连116026 宁夏公路勘察设计院有限责任公司宁夏银川750001

以大连地铁2号线香沙区间盾构隧道下穿铁路桥特殊地段为依托,通过三维有限元程序仿真模拟以及工程现场动态监测对比,研究盾构开挖对邻近桥梁地层及基础变位的影响.结果表明:地层沉降整体为一个凹槽形,即隧道中心线地层沉降大,隧道两边... 详细信息

以大连地铁2号线香沙区间盾构隧道下穿铁路桥特殊地段为依托,通过三维有限元程序仿真模拟以及工程现场动态监测对比,研究盾构开挖对邻近桥梁地层及基础变位的影响.结果表明:地层沉降整体为一个凹槽形,即隧道中心线地层沉降大,隧道两边沉降较小,按隧道横截面轴线左右对称;桩周土随着隧道开挖呈下沉趋势,且桩周土的沉降明显小于桥桩的沉降;初始桩上部存在负摩阻力,成为施加在桩上的外荷载,随着隧道开挖的进行,负摩阻力逐渐消失,全部转变为正摩阻力,且正摩阻力的数值比负摩阻力大.研究成果可为相似条件下地铁盾构的稳定控制提供依据.

关键词：地铁盾构桥桩变形规律力学行为

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Numerical studies on weak and strong ignition induced by reflected shock and boundary layer interaction

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Acta Mechanica Sinica 2022年第2期38卷 24-34,I0001页

作者： Chengyang Huang yuan Wang Ralf Deiterding dehai yu Zheng Chen SKLTCS CAPTCollege of EngineeringPeking UniversityBeijing 100871China Institute of Applied Physics ami Computational Mathematics Beijing 100094China Aerochnamics and Flight Mechanics Research Group University of SouthamptonHighfield CampusSouthampton SO171BJUK

In shock tube experiments,the interaction between the reflected shock and boundary layer can induce shock bifurcation and weak *** weak ignition can greatly affect the ignition delay time measurement in a shock tube *** this work,two-dimensional simulations considering detailed chemistry and transport are conducted to investigate the shock bifurcation and non-uniform ignition behind a retlected *** objectives are to interpret the formation of shock bifurcation induced by the reflected shock and boundary layer interaction and to investigate the weak ignition and its transition to strong ignition for both hydrogen and dimethyl *** is found that the non-uniform reflection of the incident shock at the end wall produces a wedge-shaped oblique shock foot at the *** wedge-shaped structure results in strong interactions between reflected shock and boundary layer,which induces the shock *** is demonstrated that the local high-temperature spots at the foot of the bifurcated shock is caused by viscous dissipation and pressure *** the post-reflected shock temperature increases,the transition from weak ignition to strong ignition in a stoichiometric hydrogen/oxygen mixture is *** relative sensitivity of ignition delay time to the post-rellected shock temperature is introduced to characterize the appearance of weak ignition behind the reflected *** in the hydrogen/oxygen mixture,weak ignition is not observed in the stoichiometric dimethyl-ether/oxygen mixture since it has a relatively longer ignition delay time and smaller relative sensitivity.

关键词： Shock tube Weak ignition Shock-houndary layer interaction

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Electrostatic Complexes of Nano-Montmorillonite/Ethyl Lauroyl Arginate Stabilized Sunflower Oil Pickering Emulsions

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Journal of Materials Science and Chemical Engineering 2022年第7期10卷 33-46页

作者： Qi Luo Changshui Jing Chuanyuan Yang dehai yu State Key Laboratory of Biobased Material and Green Papermaking Shandong Academy of Sciences Qilu University of Technology Jinan China

Compared with traditional surfactant-stabilised emulsions, Pickering emulsions, stabilised by clay nanoparticles, have the advantages of strong interface stability, strong versatility, and low toxicity. Moreover, they have excellent application potential in the fields of food and medicine. In this study, a food-grade Pickering emulsion stabiliser was prepared by physically adsorbing the cationic surfactant ethyl lauroyl arginate (LAE) on the surface of nano-montmorillonite (NMMT). Different LAE/NMMT combinations were assessed for their capacity to stabilise an oil-in-water emulsion at a low solid concentration (0.5%, w/v). The controllability of the droplet diameter and stability of the Pickering emulsions can be realised by changing the content of LAE. Scanning electron microscopy (SEM), and laser confocal microscopy (CLSM) confirmed the successful preparation of sunflower oil Pickering emulsion droplets stabilised by LAE/NMMT (0.0075%/1%). Additionally, the LAE/NMMT studied in this work could be used as a highly effective antibacterial surfactant with inorganic nanoparticles to efficiently stabilise Pickering emulsions, thus expanding the potential of preparing edible Pickering emulsion formulae.

关键词： Pickering Emulsion Ethyl Lauroyl Arginate Nano-Montmorillonite Stabilisation Edible Emulsifier

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三轴压缩下水影响绿泥石片岩力学性质试验研究

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岩石力学与工程学报 2009年第1期28卷 205-211页

作者：于德海彭建兵大连海事大学道路与桥梁工程研究所辽宁大连116026 长安大学地质工程与测绘学院陕西西安710054

为了解西安黑河水利工程坝肩绿泥石片岩的力学特性,利用RMT–150C岩石力学多功能试验机,分别对干燥和饱水状态的绿泥石片岩进行三轴压缩试验。基于试验结果,比较试样在不同围压作用下的力学性质,详细讨论水对试样强度和变形特性的影响规... 详细信息

为了解西安黑河水利工程坝肩绿泥石片岩的力学特性,利用RMT–150C岩石力学多功能试验机,分别对干燥和饱水状态的绿泥石片岩进行三轴压缩试验。基于试验结果,比较试样在不同围压作用下的力学性质,详细讨论水对试样强度和变形特性的影响规律,重点研究峰值强度、残余强度、软化系数、峰残差、峰残强降率、弹性模量及变形模量等强度变形指标的围压效应,最后分析三轴压缩状态下岩石的破坏类型及机制。结果表明,绿泥石片岩属于水敏型岩石,水对各个强度和变形特性的影响是显著的,并随着围压呈一定规律的变化。

关键词：岩石力学绿泥石片岩三轴压缩饱水力学性质

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Electrostatic Complexes of Nano-Montmorillonite/Ethyl Lauroyl Arginate Stabilized Sunflower Oil Pickering Emulsions

Electrostatic Complexes of Nano-Montmorillonite/Ethyl Lauroy...

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作者： Qi Luo Changshui Jing Chuanyuan Yang dehai yu State Key Laboratory of Biobased Material and Green Papermaking Shandong Academy of SciencesQilu University of Technology

Compared with traditional surfactant-stabilised emulsions, Pickering emulsions, stabilised by clay nanoparticles, have the advantages of strong interface stability, strong versatility, and low toxicity. Moreover, they have excellent application potential in the fields of food and medicine. In this study, a food-grade Pickering emulsion stabiliser was prepared by physically adsorbing the cationic surfactant ethyl lauroyl arginate(LAE) on the surface of nano-montmorillonite(NMMT). Different LAE/NMMT combinations were assessed for their capacity to stabilise an oil-in-water emulsion at a low solid concentration(0.5%, w/v). The controllability of the droplet diameter and stability of the Pickering emulsions can be realised by changing the content of LAE. Scanning electron microscopy(SEM), and laser confocal microscopy(CLSM) confirmed the successful preparation of sunflower oil Pickering emulsion droplets stabilised by LAE/NMMT(0.0075%/1%). Additionally, the LAE/NMMT studied in this work could be used as a highly effective antibacterial surfactant with inorganic nanoparticles to efficiently stabilise Pickering emulsions, thus expanding the potential of preparing edible Pickering emulsion formulae.

关键词： Pickering Emulsion Ethyl Lauroyl Arginate Nano-Montmorillonite Stabilisation Edible Emulsifier

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Nanoparticle-stabilized Alkenyl Succinic Anhydride(ASA)Emulsions:A Review

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Paper And Biomaterials 2017年第1期2卷 16-25页

作者： WenXia Liu HuiLi Wang GuoDong Li dehai yu ZhaoPing Song Kay Laboratory of Pulp&Paper Science and Technology(Ministry of Education) Qilu Universityof TechnologyJi'nanShandong Province250353China

Alkenyl succinic anhydride(ASA) is a popular paper-sizing agent that is generally added to papermaking systems as an aqueous emulsion. Herein, we reviewed the recent work focusing on ASA emulsions stabilized by solid particles. Solid particle-stabilized ASA emulsions generally possess high ASA content and exhibit good sizing performance. The particles that have been used to stabilize ASA emulsions typically include montmorillonite, laponite, alumina, TiO_2, Fe_3O_4, polyaluminum sulfate(PAS), and cellulose nanocrystals(CNCs). Montmorillonite is the first extensively studied particle stabilizer for ASA emulsions. Laponite is undoubtedly the most competent particle stabilizer for preparing ASA emulsions with high sizing efficiency. Montmorillonite and laponite can be used individually as stabilizers after modification or as co-stabilizers with other particles or polymers. TiO_2, alumina, PAS, and CNCs are commonly used as stabilizers either individually or with other particles.

关键词： alkenyl succinic anhydride particle stabilized emulsions montmorillonite laponite sizing

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纳米Fe_3O_4稳定的Pickering型ASA乳液

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化工学报 2014年第2期65卷 641-646页

作者：林兆云于得海李友明华南理工大学制浆造纸工程国家重点实验室广东广州510640

利用纳米Fe3O4作为稳定剂和乳化剂来制备Pickering型ASA(alkenyl succinic anhydride)施胶乳液,并研究了固体颗粒浓度、油水比、水分散相pH对乳液类型、稳定性、形态及施胶性能的影响。结果表明,纳米Fe3O4能够乳化制备均一稳定的Picker... 详细信息

利用纳米Fe3O4作为稳定剂和乳化剂来制备Pickering型ASA(alkenyl succinic anhydride)施胶乳液,并研究了固体颗粒浓度、油水比、水分散相pH对乳液类型、稳定性、形态及施胶性能的影响。结果表明,纳米Fe3O4能够乳化制备均一稳定的Pickering型ASA乳液。乳液在室温下静置稳定,析出油相体积分数随固体颗粒用量的增加而增大,随油水比的增大而减小。油水比为2:1,水分散相浓度为0.1%(质量分数)时制备的ASA乳液稳定性最佳。固体颗粒部分吸附在油/水界面处,部分分散在分散相中,随分散相中固体颗粒浓度的增加,乳液稳定性变差。乳液静置分层之前,ASA发生部分水解。在放置1 h后用于纸页浆内施胶,随ASA乳液用量的增加,纸页表面接触角逐渐增大,且纸页表面粗糙度下降。在ASA的添加量为1.0%(质量分数)时,纸页表面接触角达到93.5°,纸页表面粗糙度为15.924μm。

关键词：纳米Fe3O4 Pickering乳液稳定性水解施胶性能

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内插物对低压自然循环流动不稳定性的影响

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哈尔滨工程大学学报 2020年第4期41卷 525-529页

作者：程俊曹夏昕于德海韩晋玉哈尔滨工程大学核科学与技术学院黑龙江哈尔滨150001

为了抑制低压自然循环系统内产生因闪蒸诱发的两相流动不稳定现象,本文采用在上升段内设置内插物的方法。从诱发闪蒸的角度出发,使汽泡持续在插入物上产生,抑制甚至消除系统流动不稳定性。分析内插物位置及插入深度对不同运行工况下低... 详细信息

为了抑制低压自然循环系统内产生因闪蒸诱发的两相流动不稳定现象,本文采用在上升段内设置内插物的方法。从诱发闪蒸的角度出发,使汽泡持续在插入物上产生,抑制甚至消除系统流动不稳定性。分析内插物位置及插入深度对不同运行工况下低压自然循环系统内流动特性的影响。研究结果表明:当系统处于流动不稳定状态时,将内插物插入至管壁处可以消除流动不稳定性,并提升系统的循环流量,循环流量最大提升10%;当系统流动处于稳定状态时,也不会因插入物的存在对系统的流动产生不利影响。本文实验结果将为后续研究闪蒸诱发的两相流动不稳定过程提供一定参考。

关键词：低压闪蒸两相流自然循环非能动插入物流型流动不稳定

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