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Controllable and high-throughput preparation of microdroplet using an ultra-high speed rotating packed bed

Chinese Journal of Chemical Engineering 2022年第8期35卷 116-124页

作者： Jing Xie Xiangbi Jia Dan Wang Yingjiao Li Bao-chang Sun Yong Luo Guang-wen Chu Jian-feng Chen State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China

microdroplets and their dispersion,with a large specific surface area and a short diffusion distance,have been applied in various unit operations and reaction ***,it is still a challenge to control the size and size distribution of microdroplets,especially for high-throughput *** this work,a novel ultra-high speed rotating packed bed(UHS-RPB)was invented,in which rotating foam packing with a speed of 4000-12000 r·min^(-1) provides microfluidic channels to disperse liquid into microdroplets with high *** generated microdroplets can be directly dispersed into a continuous falling film for obtaining a mixture of microdroplet *** this UHS-RPB,the effects of rotational speed,liquid initial velocity,liquid viscosity,liquid surface tension and packing pore size on the average size(d_(32))and size distribution of microdroplets were systematically *** showed that the UHS-RPB could produce microdroplets with a d_(32) of 25-63μm at a liquid flow rate of 1025 L·h^(-1),and the size distribution of the microdroplets accords well with Rosin-Rammler distribution *** addi-tion,a correlation was established for the prediction of d_(32),and the predicted d_(32) was in good agreement with the experimental data with a deviation within±15%.These results demonstrated that UHS-RPB could be a promising candidate for controllable preparation of uniform microdroplets.

关键词： Ultra-high speed rotating packed bed microdroplet Controllable preparation High throughput

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Lasing emission of dye-doped cholesteric liquid crystal microdroplet wrapped by polyglycerol in hollow glass microsphere

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Chinese Optics Letters 2020年第1期18卷 44-48页

作者： Chi Zhang Dongying Fu Chunli Xia Lishuang Yao Chunlian Lu Weimin Sun Yongjun Liu Key Laboratory of In-fiber Integrated Optics Ministry of EducationHarbin Engineering UniversityHarbin 150001China State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Department of Physics College of ScienceShantou UniversityShantou 515063China

In this Letter,a dye-doped cholesteric liquid crystal(DDCLC)-filled hollow glass microsphere is demonstrated to be a resonator with good temperature response.A diglycerol layer is used to wrap the DDCLCs microdroplet to keep it steady and control its *** whispering gallery mode(WGM)lasing and photonic band gap(PBG)lasing caused by two different mechanisms were obtained under the pump of a pulsed laser,and the temperature response of these two kinds of lasing was *** the liquid crystal and chiral material used in this Letter,both the WGM lasing and the PBG lasing have a blue shift in wavelength with increasing temperature.

关键词： cholesteric liquid crystal microdroplet lasing emission whispering gallery mode

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Numerical Study of the Evaporation Effects on the microdroplet Dynamics in Digital Microfluidic Biochips

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Journal of Mechanics Engineering and Automation 2011年第5期1卷 401-406页

作者： Ali Ahmadi Matt Dale Buat Mina Hoorfar School of Engineering University of British Columbia Kelowna V1V1V7 Canada

In this paper, an electrohydrodynamic approach is used to model and study dynamics of evaporating microdroplets in digital microfluidic systems. A numerical eleetrohydrodynamic approach is used to calculate the driving force and shear force （due to the walls）. Effects of contact line pinning is considered by adding a three-phase contact line force, and also considering dynamic contact angle which modifies the mierodroplet boundary conditions. Since air is used as the filler fluid, the drag force is neglected. Although energy equation is not solved （constant temperature assumption）, effects of the evaporation is considered from two aspects： It is shown that an additional force is needed to balance the dynamic equation of the mierodroplet motion. Also, at each time step the microdroplet interface has to be deformed due to the change in the microdroplet radius. Important findings of the proposed model includes the transient velocity and displacement of the microdroplet as well as the driving and opposing forces acting on the microdroplet as functions of time. It is shown that mass loss due to evaporation tends to accelerate the droplet; whereas the competitive effect of the reduced driving force decelerates the droplet at the end of motion. The modeling results indicate that evaporation plays a crucial role in microdroplet motion by changing the force balance and the microdroplet boundary condition.

关键词： Digital microfluidic microdroplet evaporation electrohydrodynamic.

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Study on conductance of supersaturated chloride microdroplets

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Science China Chemistry 2009年第7期52卷 879-886页

作者： HE KeJuan CHENG Hua ZHU YanYing WANG LiangYu ZHANG YunHong Institute for Chemical Physics School of ScienceBeijing Institute of TechnologyBeijing 100081China

By using the measuring system previously designed by the authors, the conductance of KCl, NaCl and NH4Cl microdroplets is obtained in the whole measuring RH range, especially in the supersaturation region, which cannot be acquired from the bulk solutions and fills the gap of lack of experimental data of conductance under the supersaturated state. The ERH and DRH of these three kinds of microdroplets observed from a microscope are 80.5% and 95.4% (KCl), 75.7% and 93.3% (NaCl), and 69.9% and 96.6% (NH4Cl), respectively. In addition, it can be found from the dependence of conductance on RH that conductance is very sensitive to the existence of water molecules inside the microdroplet and the threshold of the deliquescence process can be predicted by the variation of conductance.

关键词： conductance supersaturation microdroplet chloride sodium chloride potassium chloride ammonium chloride

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Programmed co-assembly of DNA-peptide hybrid microdroplets by phase separation

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Chinese Chemical Letters 2022年第3期33卷 1545-1549页

作者： Shengtao Yao Yue Liao Rizhao Pan Weiping Zhu Yufang Xu Yangyang Yang Xuhong Qian School of Pharmacy Shanghai Key Laboratory of Chemical BiologyEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Bioreactor Engineering East China University of Science and Technology Shanghai 200237China

Biopolymers, including DNA and peptides have been used as excellent self-assembling building blocks for programmable single-component or hybrid materials, due to their controlled molecular ***, combining two assembling principles of DNA-based programmability and peptide-based specific molecular interactions for hybrid structures to microscale has not yet been achieved. In this study,we describe a hybrid microsystem that emerges from the co-assembly of DNA origami structure and short elastin-like polypeptide conjugated oligonucleotides, and initiates liquid-liquid phase separation to generate microdroplets upon heating above the transition temperature. Moreover, the hybrid microdroplets are capable for guest molecule trapping and perform bi-/tri-enzymatic cascades with rate enhancements as open “microreactors”. Our programmed assembled DNA-peptide microsystem represents a new combination of DNA nanotechnology and peptide science and opens potential application routes toward lifeinspired biomaterials.

关键词： Self-assembly microdroplet DNA origami Phase separation Elastin-like polypeptides

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Nonlinear dynamics and manipulation of dripping in capillary flow focusing

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Science China(Physics,Mechanics & Astronomy) 2019年第12期62卷 78-88页

作者： Kai Mu Ting Si Hang Ding Department of Modern Mechanics University of Science and Technology of China

In this study, we carried out experimental and numerical investigations on the dripping dynamics in axisymmetric capillary flow focusing. For the direct numerical simulations, we solved the Navier-Stokes equations coupled with a diffuse interface *** the experiments, we observed both periodic and non-periodic dripping modes at different focused and focusing liquid flow rates. The non-periodic dripping that results in polydispersed droplets downstream the orifice can be attributed to the nonlinear dynamics of the flow;thus, we constructed numerical plots of the streamlines and temporal evolutions of the focused liquid cone in different modes. We identified a phase diagram of the dripping regimes in the plane of mainly dimensionless parameters, which led us to further investigate the effects of liquid physical properties, such as viscosity and interface tension, on the mode *** suppression of the nonlinear dynamics, we proposed a geometrical optimization that imports a guiding rod positioning along the axis of the capillary tube. Here, we conducted a numerical analysis on the manipulation of the dripping process, as well as scaling analysis on the appearance of the nonlinear dripping. We expect this study to provide an insight into the underlying physical mechanisms of dripping in flow focusing, which are advantageous in the generation of monodispersed microdroplets for various applications.

关键词： flow focusing microdroplet dripping nonlinear dynamics

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Computational and Experimental Analyses of Detachment Force at the Interface between Carbon Fibers and Epoxy Resin

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Open Journal of Composite Materials 2017年第4期7卷 179-184页

作者： Kazuki Mori Nobuhiko Matsumoto Sukeharu Nomoto Kenji Tsuruta ITOCHU Techno-Solutions Corp. Kasumigaseki Chiyoda-ku Tokyo Japan Mitsubishi Gas Chemical Company Inc. Higashiyawata Hiratsuka-shi Kanagawa Japan Graduate School of Natural Science and Technology Okayama University Tsushima-naka Kita-ku Okayama Japan

Herein, we used theoretical and experimental methods to investigate the shear fracture strengths of carbon fiber/epoxy resin interfaces. The shear strengths of carbon fiber and epoxy resin were measured using the microdroplet test, whereas interaction and binding energies were estimated using?Ab initio?and molecular dynamics methods. However, binding energies did not impact the shear strength volumes determined by microdroplet tests,?i.e., bonds between functional groups of the carbon filer and the epoxy resin were difficult to break. On the other hand, the interaction energies calculated for epoxy monomers were in good agreement with experimental data. Moreover, we determined the relationship between the simulated interaction energy and the shear fracture strength volume obtained using the microdroplet test.

关键词： Carbon Fiber–Reinforced Composite Ab initio Method Molecular Dynamics Simulation microdroplet Test

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