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Mechanically durable,super-repellent 3D printed microcell/nanoparticle surfaces

Nano Research 2022年第6期15卷 5678-5686页

作者： Sajad Haghanifar Anthony J Galante Mehdi Zarei Jun Chen Susheng Tan Paul W Leu Department of Industrial Engineering University of PittsburghPittsburghPA 15261USA Department of Mechanical Engineering and Materials Science University of PittsburghPittsburghPA 15261USA Department of Electrical and Computer Engineering and Peterson Institute of NanoScience and Engineering University of PittsburghPittsburghPA 15261USA Department of Chemical Engineering University of PittsburghPittsburghPA 15261USA

Three-dimensional(3D)printed re-entrant micropillars have demonstrated high static contact angles for an unprecedented variety of liquids,but have yet to achieve this with low contact angle hysteresis and excellent abrasion *** report on the demonstration of 3D printed microcell/nanoparticle structures that exhibit high static contact angle,low contact angle hysteresis,and high mechanical *** and microcells both exhibit high static contact angles with water and ethylene glycol(EG),but suffer from high contact angle hysteresis,indicative of rose petal *** modeling results indicate that micropillars are able to achieve higher static contact angle and breakthrough pressure simultaneously compared with ***,simulations also indicate that micropillars have higher maximum equivalent stress at their bases,so that they are more prone to mechanical *** address contact angle hysteresis and mechanical durability issues by the creation of 3D printed microcell/nanoparticle arrays that demonstrate super-repellency and retain their super-repellency after 100 cycles of mechanical abrasion with a Scotch-Brite abrasive pad under a pressure of 1.2 *** use of interconnected microcell structures as opposed to micropillars addresses mechanical durability *** contact angle hysteresis is realized by coating 3D printed structures with low surface energy nanoparticles,which lowers the solid–liquid contact area *** results demonstrate new 3D printed structures with mechanical durability and super-repellency through the use of microcell structures integrated with fluorinated nanoparticles.

关键词： superomniphobicity three-dimensional(3D)printing surface evolver mechanical durability microcell re-entrant micropillar

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Stable oncogenic transformation induced by microcell-mediated gene transfer

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Science China Chemistry 1995年第4期38卷 448-456页

作者：吕有勇 Donald G.Blair Beijing Institute for Cancer Research Beijing 100034 China Laboratory of Molecular Oncology National Cancer Institute Frederick MD 21702-1013 USA

Oncogenes have been identified using DNA-mediated transfection, but the size of the transferable and unrearranged DNA, gene rearrangement and amplification which occur during the transfection process limit the use of the techniques. We have evaluated microcell-mediated gene transfer techniques for the transfer and analysis of dominant oncogenes. MNNG-HOS, a transformed human cell line which contained the met oncogene mapping to human chromosome 7 was infected with retroviruses carrying drug resistance markers and used to optimize microcell preparation and transfer. Stable and drug-resistant hybrids containing single human chromosomes as well as the foci of the transformed cells containing the activated met oncogene and intact hitman chromosomes were obtained. Hybridization analysis with probes (i.e. collA2, pJ3.11) mapping up to 1 Mb away from met shows that the cells from the individual focr contain different amounts of apparently unrearranged human DNA associated with the oncogene, and the microcell-generated transformants retain more distal markers than those observed in either DNA- or chromosome-mediated transfers. In conjunction with other techniques, microcell fusion should be useful for gene mapping as well as the study of gene function and expression in cell transformation and malignancy.

关键词： oncogene microcell cell transformation gene mapping met.

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Study on interaction between macrocell and microcell in the early corrosion process of reinforcing steel in concrete

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Science China(Technological Sciences) 2010年第5期53卷 1285-1289页

作者： LI LanQiang1,DONG ShiGang1,WANG Wei2,HU RongGang1,DU RongGui1,LIN ChangJian1,ZHUO XiangDong1 & WANG Jia2 1 State Key Laboratory of Physical Chemistry of Solid Surfaces,Department of Chemistry,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China 2 College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China State Key Laboratory of Physical Chemistry of Solid Surfaces Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen China College of Chemistry and Chemical Engineering Ocean University of China Qingdao China

An array electrode technique was developed as a novel electrochemical method for studying the interaction between macrocell and microcell in the early corrosion process of reinforcing steel in cement *** corrosion potential and galvanic current of macrocell corrosion of the reinforcing steel in cement mortar were imaged by the array electrode technique during the corrosion initiation and *** was certified that the corrosion macrocell current is closely related with the difference of corrosion potential between the anodic and cathodic *** corrosion macrocell and microcell always exist during the corrosion *** interaction of corrosion macrocell and corrosion microcell of steel in concrete was directly sensed by the array electrode for the first time,and was discussed in terms of corrosion electrochemistry.

关键词： reinforcing steel in concrete array electrode macrocell microcell

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应用Sysmex F-800 microcell Counter鉴别血尿来源

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潍坊医学院学报 2005年第2期27卷 81-82页

作者：肖青曹卫华王金铃赵学兰刘晓霞王燕潍坊医学院附属医院肾内科山东潍坊261031

目的探讨Sysmex F-800 microcell counter在区分肾小球性血尿与非肾小球性血尿中的应用价值。方法应用Sysmex F-800 microcell counter对400例血尿病人进行了自身血和尿红细胞平均体积(MCV)及其比值测定,然后与临床及病理诊断进行对照,... 详细信息

目的探讨Sysmex F-800 microcell counter在区分肾小球性血尿与非肾小球性血尿中的应用价值。方法应用Sysmex F-800 microcell counter对400例血尿病人进行了自身血和尿红细胞平均体积(MCV)及其比值测定,然后与临床及病理诊断进行对照,并将数据按两样本均数的t检验进行统计学处理。结果肾小球性血尿患者的血红细胞MCV在83-108 fl之间,尿红细胞MCV在40-78 fl之间,自身血和尿红细胞MCV比值为1.3- 2.1。非肾小球性血尿者血红细胞MCV在79-112 fl之间,尿红细胞MCV在76-136 fl之间,自身血和尿红细胞MCV比值为0.76-1.0。结论尿红细胞MCV1.3为肾小球性血尿,论断符合率为98.8%;尿红细胞MCV≥77 fl,血和尿红细胞MCV比值≤1为非肾小球性血尿,符合率为98.3%,测定血尿病人自身的血和尿红细胞MCV及其比值不受检验人员主观因素的影响,可以更客观、准确地区分血尿来源。

关键词： Sysmex F-800 microcell Counter 血尿血细胞自动分析仪离心镜

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Simulation and Analysis of Outdoor microcellular Radio Propagation Characteristics Based on the Method of SBR/Image

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Journal of Computer and Communications 2015年第3期3卷 86-92页

作者： Xue Ma Yuanjian Liu Qinjian Shi Yerong Zhang College of Electronic Science and Engineering Nanjing University of Posts & Telecommunications Nanjing China

In this paper, the outdoor microcellular radio propagation characteristics at 3.5 GHz are simulated and analyzed by the method of SBR/Image (Shooting and bouncing ray tracing/Image). A good agreement is achieved between the results simulated and the results given in published literature. So the correctness of the method has been validated. Some simulated propagation parameters of LOS (Line-of-sight) and NLOS (None-line-of-sight) have been compared. The analysis of the above results provides the foundation for the coverage of outdoor microcellular systems.

关键词： SBR/Image Outdoor microcell Propagation Characteristics

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Damage and fracture model for eutectic composite ceramics

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Acta Mechanica Sinica 2019年第1期35卷 190-200,I0006页

作者： Jinfeng Yu Xinhua Ni Xiequan Liu Yunwei Fu Zhihong Du Department of Vehicle and Electric Engineering Army Engineering UniversityShijiazhuang 050003China Army Infantry College Nanchang 330000China Xichang Satellite Launch Center Xichang 615000China

Study of damage and fracture models to analyze the fracture mechanism of eutectic composite ceramics is of considerable importance because no accurate fracture models are available for these materials. Eutectic composite ceramics are composed of microcells with random direction. We present herein a model that predicts the damage and fracture of eutectic composite ceramics based on analysis of defect stability and the damage localization band. Firstly, given the microstructure of eutectic composite ceramics, a mesodomain and a microcell model are constructed. The local stress field in the mesodomain is then analyzed based on the interaction direct derivative estimate. Secondly, the stability of a defect around particles in a microcell is analyzed, and the stress intensity factor of an annular defect under the applied stress field and the residual stress field in the particle are calculated. The stress intensity factor of a defect is controlled by the residual stress when the defect extension is small. However, it is controlled by the applied stress when the defect extension is large. Finally, a model for the damage localization band at the crack tip is constructed based on the Dugdale-Barenblatt model. The residual intensity is the important factor affecting the length of the damage localization band. When the damage variables reach their largest value, the residual in ten sity and the length of the damage localization band attain their minimum value. This work provides the theoretical basis for further study of the damage mechanics of eutectic composite ceramics and guides the engineering applications of these materials.

关键词： microcell Interaction direct derivative estimate Defect stability Damage localization band

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