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Journal articles on the topic 'Micro-Jetting'

Author: Grafiati

Published: 4 June 2021

Last updated: 2 February 2022

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1

Sun, Huaiyuan, Qingqing Gu, Yuehua Liao, and Chenjie Sun. "Research of Amoxicillin Microcapsules Preparation Playing Micro-Jetting Technology." Open Biomedical Engineering Journal 9, no. 1 (March 31, 2015): 115–20. http://dx.doi.org/10.2174/1874120701509010115.

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With polylactic-co-glycolic acid(PLGA) as shell material of microcapsule, amoxicillin as the model, poly(vinyl alcohol) and twain as surfactant, amoxicillin-PLGA microcapsules were manufactured using digital micro-jetting technology and a glass nozzle of 40μm diameter. The influences of the parameters of micro-jetting system on the mean grain size and size distribution of amoxicillin-PLGA microcapsules were studied with single factor analysis and orthogonal experiment method, namely, PLGA solution concentration, driving voltage, jetting frequency, stirrer speed, etc. The optimal result was obtained; the form representation of microcapsule was analyzed as well. The results show that, under certain conditions of experimental drug prescription, driving voltage was proportional to the particle size; jetting frequency and stirrer speed were inversely proportional. When the PLGA concentration for 3%, driving voltage for 80V, the jetting frequency for 10000Hz and the stirrer speed for 750rpm, the particles were in an ideal state with the mean grain size of 60.246μm, the encapsulation efficiency reached 62.39％ and 2.1％ for drug loading.

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2

LI, XIAORAN, JUN XU, LEI ZHAO, XIAO GUO, and WEI HUANG. "A NOVEL NANOFABRICATION USING MICRO DROPLET JETTING SYSTEM." International Journal of Nanoscience 05, no. 06 (December 2006): 809–13. http://dx.doi.org/10.1142/s0219581x06005194.

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This study briefly reports a newly developed nanopatterning technology utilizing a so-called micro droplet jetting system, which can be used in various applications such as nanofabrication. Compared with the conventional methods, this technology has the advantages as follows: it can be manipulated easily and patterned freely as the user requires; furthermore, it shows high-reliability and high-stability with very low cost. The typical specs of the micro droplet jetting system for fabricating nanodevice show as follows: (1) nanoparticle size: 50–60 nm; (2) characteristic wavelength: 400–450 nm; (3) volume of droplet: 6 ppl; (4) size of pixel: 70 μm. In this article, the nanopatterning technology adopting the micro droplet jetting system has been demonstrated to be useful for nanopatterning the pixels which consist of nanoparticles, organic luminescent materials. In addition, the micro topography and the luminescent property of the patterned surface have been characterized by using Scanning Electron Microscope (SEM) and fluorescence microscope, respectively. Finally, the fluorescence of the patterned nanoparticles was observed.

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3

Zhan, Hong-wu, Fang Xu, and Ling-feng Lu. "Researches on the Observation on the Jetting of Liquid of High Viscosity and Droplet Control." Open Mechanical Engineering Journal 9, no. 1 (October 7, 2015): 812–19. http://dx.doi.org/10.2174/1874155x01509010812.

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Valve regulated droplet jetting is an important method for the generation of liquid droplet of high viscosity. Based on learning from piezoelectric micro-droplet jetting mechanism and researching methods, theoretical analysis and simulation were conducted on the factors affecting the micro-droplet jetting volume, and the qualitative relationship between the size of the jetted droplet and the feed pressure and striker stroke so as to guide the designing of the structure of the pneumatic valve control type nozzle and design the droplet jetting system and observation experiment platform based on stroboscopic techniques. Different jetting parameters was changed according to the results of the theoretical analysis for the conduction of jetting experiment, and several glycerin solutions at different solutions were taken as the working liquid for studying the effect of the several factors like feed pressure, pulse driving pressure, driving pulse width, and striker stroke. The striker would not be lifted to an ultimate position through controlling the pulse air pressure or driving pulse width so as to be able to jet extremely tiny droplet, but this is of rather bad stability. It is the most effective, stable and optimized method to control the striker stroke so as to change the diameter and shapes of the droplets.

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4

Xing, Bo, Chun Cheng Zuo, Feng Li Huang, Ye Bo Lu, and Guang Shan Hu. "Effect of Electrode Distance on Jetting Behavior of Non-Particle Nano Ag Conductive Ink in Electrohydrodynamic Micro Jet Printing." Materials Science Forum 893 (March 2017): 118–21. http://dx.doi.org/10.4028/www.scientific.net/msf.893.118.

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The effect of electrode distance on jetting behavior of non-particle nanoAg conductive ink during Electrohydrodynamics (EHD) under the direct current voltage is investigated. Experiments results indicate that the height of the meniscus increases while the curve decreases with the increase of electrode distance, and the jetting behavior evolves from pulsate cone jetting to pulsate micro dripping jetting. The low voltage combined with long electrode distance resulted in returning of meniscus to its original shape. With the increase of voltage, the increased electrode distance result in the increase of meniscus deformation and the electrode distance for maintaining the stable jetting was increased. Under the same voltage, the line width increases with the increase of electrode distance. The exceeded long electrode distance and high voltage resulted in jitter of elongated meniscus thus is not beneficial for the printing quality control.

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5

Liang, Hanzhuang, Floriana Suriawidjaja, and Michael Szuch. "Anaerobic adhesive jetting for micro-electronics packaging applications." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2015, DPC (January 1, 2015): 000726–42. http://dx.doi.org/10.4071/2015dpc-tp32.

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Anaerobic fluid has been used as an industrial adhesive to seal or bond metal components for both large and small scales. Its use has recently extended to micro-electronics packaging. This novel application brings challenges to the dispensing process due to part handling at micro-scale dimensions and high production throughput. Most high-precision dispensers have fluid paths that are constructed of metal components to ensure product robustness and enable dimensional precision of micro-scale parts. This is incompatible with anaerobic adhesives which cure in the absence of oxygen and utilize metal ions as the catalyst. Furthermore curing accelerates with smaller gaps. A non-contact jetting solution has been developed and applied in production environment to dispense anaerobic adhesives with precise volume control, at high speed, and in continuous operation. Dispensing can be optimized to include a range of hardware dimensions, component surfaces, fluid handling, and process control.

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6

Li, Zong'an, Jiquan Yang, Li Zhu, and Wencheng Tang. "Fabrication of paper micro-devices with wax jetting." RSC Advances 6, no. 22 (2016): 17921–28. http://dx.doi.org/10.1039/c5ra26255k.

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7

Zenou, M., A. Sa'ar, and Z. Kotler. "Supersonic laser-induced jetting of aluminum micro-droplets." Applied Physics Letters 106, no. 18 (May 4, 2015): 181905. http://dx.doi.org/10.1063/1.4921009.

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8

Lee, Hyun-Shik, Insu Park, Keum Soo Jeon, and El-Hnag Lee. "Fabrication of micro-lenses for optical interconnection using micro ink-jetting technique." Microelectronic Engineering 87, no. 5-8 (May 2010): 1447–50. http://dx.doi.org/10.1016/j.mee.2009.11.116.

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9

Liu, Baohui, Hang Zou, Haixuan Luo, and Xiaoming Yue. "Investigation on the Electrochemical Micromachining of Micro Through-Hole by Using Micro Helical Electrode." Micromachines 11, no. 2 (January 21, 2020): 118. http://dx.doi.org/10.3390/mi11020118.

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The instability of machining process caused by the difficulty of the electrolyte refresh in electrochemical micromachining (EMM) of micro through-hole has been an unsolved problem. Thus, this paper investigates the electrochemical micromachining of micro through-hole by using a micro helical electrode combining with the jetting electrolyte. With the help of high-speed rotation of micro helical electrode and its spiral shape, the internal electrolyte can be stirred while the external jetting electrolyte can flow into the hole along the spiral groove to refresh the electrolyte effectively, thereby, improving the machining stability of EMM. Firstly, the influence of the process parameters on the fabrication of micro through-hole in the EMM by using micro helical electrode without non-conductive mask is investigated. Based on the optimization of the process parameters, a micro through-hole with an inlet dimension of 121.6 μm and an outlet dimension of 114.9 μm is obtained successfully. Furthermore, this paper also tries to use the micro helical electrode coated with the non-conductive mask to decrease the bad influence of the stray corrosion attack. It is found that the non-conductive mask coated on the surface of micro helical electrode can improve the machining accuracy significantly under the condition of low pulse frequency (≤1 KHz). However, its good effect on preventing the stray corrosion decreases along with the increase of the pulse frequency.

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10

KHOO, B., E. KLASEBOER, and K. HUNG. "A collapsing bubble-induced micro-pump using the jetting effect." Sensors and Actuators A: Physical 118, no. 1 (January 31, 2005): 152–61. http://dx.doi.org/10.1016/s0924-4247(04)00552-7.

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11

Shu, XiaYun, HongHai Zhang, HuaYong Liu, Dan Xie, and JunFeng Xiao. "Experimental study on high viscosity fluid micro-droplet jetting system." Science in China Series E: Technological Sciences 53, no. 1 (January 2010): 182–87. http://dx.doi.org/10.1007/s11431-009-0329-4.

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12

Moon, S. E., H. K. Lee, N.-J. Choi, H. T. Kang, J. Lee, S. D. Ahn, and S. Y. Kang. "Low power consumption micro C2H5OH gas sensor based on micro-heater and ink jetting technique." Sensors and Actuators B: Chemical 217 (October 2015): 146–50. http://dx.doi.org/10.1016/j.snb.2014.10.034.

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13

Shibayama, T., and M. Kunieda. "Diffusion Bonded EDM Electrode with Micro Holes for Jetting Dielectric Liquid." CIRP Annals 55, no. 1 (2006): 171–74. http://dx.doi.org/10.1016/s0007-8506(07)60391-6.

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14

Bok, Moonjeong, Zhi-Jun Zhao, Soon Hyoung Hwang, Hyeok-Joong Kang, Sohee Jeon, Jiwoo Ko, Jiwon Jeong, Young Seok Song, Eunju Lim, and Jun-Ho Jeong. "Effective Dispensing Methods for Loading Drugs Only to the Tip of DNA Microneedles." Pharmaceutics 12, no. 10 (October 10, 2020): 954. http://dx.doi.org/10.3390/pharmaceutics12100954.

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Here, we propose a novel and simple method to efficiently capture the diffusion of fluorescein isothiocyanate (FITC)-dextran from a biocompatible substance and load the drug only to the tip of DNA microneedles. A dispensing and suction method was chosen to fabricate the designed microneedles with efficient amounts of FITC as the drug model. Importantly, the vacuum process, which could influence the capturing of FITC diffusion from the tip, was evaluated during the manufacturing process. In addition, the simulations were consistent with the experimental results and showed apparent diffusion. Moreover, dextrans of different molecular weights labeled with FITC were chosen to fabricate the tip of microneedles for demonstrating their applicability. Finally, a micro-jetting system with a micro-nozzle (diameter: 80 μm) was developed to achieve the accurate and rapid loading of small amounts of FITC using the anti-diffusion and micro-jetting methods. Our method not only uses a simple and fast manufacturing process, but also fabricates the tips of microneedles more efficiently with FITC compared with the existing methods. We believe that the proposed method is essential for the clinical applications of the microneedle drug delivery platform.

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15

Huang, Wei Jun, and Qin Zhang. "Swirl-Based Non-Contact Method of Cell Orientation Control." Key Engineering Materials 609-610 (April 2014): 660–65. http://dx.doi.org/10.4028/www.scientific.net/kem.609-610.660.

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Orientation adjustment is an important issue in the micromanipulation of cells. A non-contact method based on a swirl for cell orientation control was introduced in this paper. The swirl is produced by a pair of opposite micro-fluids squirting from two parallel tubes. Cell orientation adjustment is realized by cells rotation due to swirl viscous drag, which drives cells to desired configurations. The appropriate distances between the end face of the two tubes and the distance between the axes of them are 1-3 times tube diameter for the cells rotating in the swirl central zone. Especially when the distances are kept double the cell diameter, cells rotate steadily round the swirl central point. By pulsating jetting, fluctuant micro-fluid are generated which make cell rotating a certain angle. Adjusting the pulse duration, pressure and jetting velocity, the cell rotation angle can be controlled which make orientation control more precisely. The method is valid for cells of different shapes and sizes. The effectiveness of the proposed non-contact method for cell configuration control was verified by experiments.

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16

Na, Li, Yang Jiquan, Cheng Jihong, and Qian Weixing. "Digital Printing of the Thin Film Sensor with Sharp Edge Based on Electrodynamics 3DP." Open Electrical & Electronic Engineering Journal 8, no. 1 (December 31, 2014): 573–79. http://dx.doi.org/10.2174/1874129001408010573.

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We present a digital voltage printing regime for high-speed and high-precision Micro-jet printing. The voltage pulse peak induces a very fast Micro-jetting mode from the nozzle for a short duration, while a low voltage is picked to ensure the sharp edge, and the high voltage is picked to ensure the printing speed. The conducting films were assembled on electrode arrays of substrate and characterized with respect to their layer thickness and thermal properties. Through an optimal choice of the digital frequency dynamically, a jet-printing regime with a specified droplet size and droplet spacing can be created in different steps. High spatial resolution can also be achieved by properly coordinating the pulsing with large and small current. The edge burr problem was solved by using the dynamic control of the droplets sizes and jetting rapid through the pulse signal. The sensor was printed using heterogeneous material model. Sensor recovery time, response linearity and sensitivity were all significantly improved using the digital pulse regime fabrication.

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17

Ribeiro, J., J. Campos, I. Plaksin, R. Mendes, and J. Góis. "Asymmetric collapse and micro-jetting in shock wave propagation in porous materials." Journal de Physique IV (Proceedings) 110 (September 2003): 887–92. http://dx.doi.org/10.1051/jp4:20020806.

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18

Guillaument, Romain, Arnaud Erriguible, Cyril Aymonier, Samuel Marre, and Pascale Subra-Paternault. "Numerical simulation of dripping and jetting in supercritical fluids/liquid micro coflows." Journal of Supercritical Fluids 81 (September 2013): 15–22. http://dx.doi.org/10.1016/j.supflu.2013.04.011.

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19

Schlothauer, T., C. Schimpf, M. R. Schwarz, G. Heide, and E. Kroke. "The role of decompression and micro-jetting in shock wave synthesis experiments." Journal of Physics: Conference Series 774 (November 2016): 012053. http://dx.doi.org/10.1088/1742-6596/774/1/012053.

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20

Yang, Lijun, Li Zhu, Zongan Li, and Baochun Lu. "Fabrication of PDMS microfluidic chips used in rapid diagnosis by micro jetting." Multimedia Tools and Applications 77, no. 3 (September 22, 2016): 3761–74. http://dx.doi.org/10.1007/s11042-016-3958-1.

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21

Lu, Chen, Zheng, Zhao, and Long. "Simulation and Experiment on Droplet Volume for the Needle-Type Piezoelectric Jetting Dispenser." Micromachines 10, no. 9 (September 18, 2019): 623. http://dx.doi.org/10.3390/mi10090623.

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The needle-type piezoelectric jetting dispenser is widely applied in the microelectronics packaging field, and it is important to control the droplet size to ensure that the droplet jetting process is successful. In this study, we analyzed the influences of system parameters, such as air pressure, nozzle size, needle strokes, and liquid properties, on droplet size and morphology by considering the droplet formation and separation process through a numerical simulation. An experimental platform was also designed to verify the reliability of the simulations and further analyze strategies for controlling the droplet size. We found that the droplet volume can be increased with an increase in air pressure, needle strokes, and nozzle size until the flow-stream or satellite droplets appear. On the other hand, very small values of these parameters will lead to adhesion or micro-dots. A large nozzle and needle displacement should be chosen for the high-viscosity liquid in order to produce normal droplets. The results also show the recommended ranges of parameter values and suitable droplet volumes for liquids with different viscosities, and these findings can be used to guide the droplet volume control process for needle-type jetting dispensers.

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22

Kurz, Alexander, Jörg Bauer, and Manfred Wagner. "Piezo-Plunger Jetting Technology: An Experimental Study on Jetting Characteristics of Filled Epoxy Polymers." Fluids 4, no. 1 (February 1, 2019): 23. http://dx.doi.org/10.3390/fluids4010023.

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The droplet formation of Newtonian fluids and suspensions modified by spherical, non-colloidal particles has attracted much interest in practical and theoretical research. For the present study, a jetting technique was used which accelerates a geometrically defined plunger by a piezoelectric actuator. Changing rheological properties of materials and extending deformation rates towards nonlinear viscoelastic regimes created the requirement to extend dosage impulses towards larger magnitudes. To mimic the rheological characteristics of nonconductive adhesives we modified Newtonian epoxy resins by thixotropic additives and micro-scale glass spheres. Rheological analysis at steady shear and oscillatory shear ensured a differentiation between material and process-related factors. Evaluation of high-speed images allowed the investigation of drop dynamics and highlighted the dispense impulse reduction by material-specific dampening properties.

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23

Mancuso, Elena, Naif Alharbi, Oana A. Bretcanu, Martyn Marshall, Mark A. Birch, Andrew W. McCaskie, and Kenneth W. Dalgarno. "Three-dimensional printing of porous load-bearing bioceramic scaffolds." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 231, no. 6 (January 5, 2017): 575–85. http://dx.doi.org/10.1177/0954411916682984.

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This article reports on the use of the binder jetting three-dimensional printing process combined with sintering to process bioceramic materials to form micro- and macroporous three-dimensional structures. Three different glass-ceramic formulations, apatite–wollastonite and two silicate-based glasses, have been processed using this route to create porous structures which have Young’s modulus equivalent to cortical bone and average bending strengths in the range 24–36 MPa. It is demonstrated that a range of macroporous geometries can be created with accuracies of ±0.25 mm over length scales up to 40 mm. Hot-stage microscopy is a valuable tool in the definition of processing parameters for the sintering step of the process. Overall, it is concluded that binder jetting followed by sintering offers a versatile process for the manufacture of load-bearing bioceramic components for bone replacement applications.

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24

Lahann, Joerg. "Recent Progress in Nano-biotechnology: Compartmentalized Micro- and Nanoparticles via Electrohydrodynamic Co-jetting." Small 7, no. 9 (April 8, 2011): 1149–56. http://dx.doi.org/10.1002/smll.201002002.

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25

Xu, Lei, and Chao Wang. "Electric Field of the Tip-Plane Electrode Configuration in Electrohydrodynamic Printing." Applied Mechanics and Materials 278-280 (January 2013): 101–4. http://dx.doi.org/10.4028/www.scientific.net/amm.278-280.101.

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Electrohydrodynamic printing draws much attention as it is a promising micro/nano patterning method and can ejects high-viscosity solution. The solution is pulled out of a nozzle under a high voltage. A used tip-plane electrode configuration is composed of a conducting plane collector and a hyperbola-shaped solution pendant adhered to a steel nozzle in electrohydrodynamic printing. The electric field between electrodes is extremely non-uniform owing to structural complexity of electrode configuration. We disintegrate the overall electric field into three components: a charge-free space field, a charged droplet field and an ion field. Proper models for those fields are set up and analyzed. The result shows that the elliptic-cylinder model, a dominant component for the jetting, is available for the field. The charged droplet field hardly deforms the space field in low-frequency pulsation mode, but influences the jetting in high-frequency pulsation mode. The ion field caused by space ions is little and negligible.

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26

Khan, S., T. P. Nguyen, M. Lubej, L. Thiery, P. Vairac, and D. Briand. "Low-power printed micro-hotplates through aerosol jetting of gold on thin polyimide membranes." Microelectronic Engineering 194 (July 2018): 71–78. http://dx.doi.org/10.1016/j.mee.2018.03.013.

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27

Lan, Wenjie, Shaowei Li, and Guangsheng Luo. "Numerical and experimental investigation of dripping and jetting flow in a coaxial micro-channel." Chemical Engineering Science 134 (September 2015): 76–85. http://dx.doi.org/10.1016/j.ces.2015.05.004.

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28

Silva, Miguel R., António M. Pereira, Álvaro M. Sampaio, and António J. Pontes. "Assessment of the Dimensional and Geometric Precision of Micro-Details Produced by Material Jetting." Materials 14, no. 8 (April 15, 2021): 1989. http://dx.doi.org/10.3390/ma14081989.

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Additive Manufacturing (AM) technology has been increasing its penetration not only for the production of prototypes and validation models, but also for final parts. This technology allows producing parts with almost no geometry restrictions, even on a micro-scale. However, the micro-Detail (mD) measurement of complex parts remains an open field of investigation. To be able to develop all the potential that this technology offers, it is necessary to quantify a process’s precision limitations, repeatability, and reproducibility. New design methodologies focus on optimization, designing microstructured parts with a complex material distribution. These methodologies are based on mathematical formulations, whose numerical models assume the model discretization through volumetric unitary elements (voxels) with explicit dimensions and geometries. The accuracy of these models in predicting the behavior of the pieces is influenced by the fidelity of the object’s physical reproduction. Despite that the Material Jetting (MJ) process makes it possible to produce complex parts, it is crucial to experimentally establish the minimum dimensional and geometric limits to produce parts with mDs. This work aims to support designers and engineers in selecting the most appropriate scale to produce parts discretized by hexahedral meshes (cubes). This study evaluated the dimensional and geometric precision of MJ equipment in the production of mDs (cubes) comparing the nominal design dimensions. A Sample Test (ST) with different sizes of mDs was modeled and produced. The dimensional and geometric precision of the mDs were quantified concerning the nominal value and the calculated deviations. From the tests performed, it was possible to conclude that: (i) more than 90% of all analyzed mDs exhibit three dimensions (xyz) higher than the nominal ones; (ii) for micro-details smaller than 423 μm, they show a distorted geometry, and below 212 μm, printing fails.

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29

Shah, Lee, and Hur. "Design and Characteristic Analysis of a MEMS Piezo-Driven Recirculating Inkjet Printhead Using Lumped Element Modeling." Micromachines 10, no. 11 (November 6, 2019): 757. http://dx.doi.org/10.3390/mi10110757.

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The recirculation of ink in an inkjet printhead system keeps the ink temperature and viscosity constant, and leads to the development of a high-performance device. Herein, we propose a recirculating piezo-driven micro-electro-mechanical system (MEMS)-based inkjet printhead that has a pressure chamber, a nozzle, and double restrictors. The design and characteristic analysis are performed using a two-port lumped element model (LEM) to investigate the effect of design parameters on the system responses. Using LEM, the jetting pressure at the pressure chamber, velocity at the nozzle inlet, meniscus pressure, and Helmholtz resonance frequency are predicted and the comparative analysis of the jetting pressure and velocity between LEM and the finite element method (FEM) simulation is conducted to validate our proposed LEM method. Furthermore, the effect of a change in major design parameters on the jetting pressure, velocity, and Helmholtz resonance frequency is analyzed. On the basis of this analysis, the optimized device dimensions are finalized. From our analysis, it is also concluded that the restrictor is more sensitive than the pressure chamber in terms of their variations in depth. As the cross-talk effect can occur due to an array of hundreds or thousands of nozzles, we investigated the effect of a single activated nozzle on the non-activated neighboring nozzles, as well as the effect of multi-activated nozzles on a single central nozzle using our proposed LEM.

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30

Lee, Yong-Chan, Henzeh Leeghim, and Chang-Yull Lee. "Micropatterning of Metal-Grid Micro Electro Mechanical Systems (MEMS) Sensor for Crack Detection Using Electrohydrodynamic Printing System." Journal of Nanoscience and Nanotechnology 20, no. 7 (July 1, 2020): 4385–89. http://dx.doi.org/10.1166/jnn.2020.17601.

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In this paper, a mechanism of sensors for micro crack detection is proposed according to circuit disconnection. In order to detect micro cracks, sensitive sensors based on micropatterning using a electrohydrodynamic (EHD) technology are necessary. For EHD printing, it is essential to find an optimum condition between ink materials and environmental parameters. Therefore, the distribution of the jetting mode between the flow rate and the voltage is confirmed through experiments. Metal-grid was patterned and resistance of each circuit by crack occurrence was measured. The resistance changes are occurred at the position where the crack is generated, and the crack position can be estimated with grid type sensors. The resistance in the cracked circuits are relatively larger than it in non-cracked circuits. It was confirmed that micro cracks were well detected by using the proposed crack sensors and mechanisms.

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31

Lu, Shizhou, Guangyu Cao, Hai Zheng, Dongqi Li, Meiyan Shi, and Jiahui Qi. "Simulation and Experiment on Droplet Formation and Separation for Needle-Type Micro-Liquid Jetting Dispenser." Micromachines 9, no. 7 (June 29, 2018): 330. http://dx.doi.org/10.3390/mi9070330.

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32

Letendre, Will. "44.1: Challenges in Jetting OLED Fluids in the Manufacturing of FPD Using Piezoelectric Micro-Pumps." SID Symposium Digest of Technical Papers 35, no. 1 (2004): 1273. http://dx.doi.org/10.1889/1.1821341.

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33

Dilag, Jessirie, Tiffany Chen, Sheng Li, and Stuart A. Bateman. "Design and direct additive manufacturing of three-dimensional surface micro-structures using material jetting technologies." Additive Manufacturing 27 (May 2019): 167–74. http://dx.doi.org/10.1016/j.addma.2019.01.009.

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34

Cai, Jili, Suo Fan, Fuchu Liu, Wenming Jiang, Hebao Wu, and Zitian Fan. "Preparation of porous Al2O3 ceramic microspheres by a novel micro-droplet jetting rapid forming method." Ceramics International 45, no. 16 (November 2019): 20583–88. http://dx.doi.org/10.1016/j.ceramint.2019.07.039.

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35

Zhu, Xiaoyang, Hongbo Lan, Jianjun Yang, and Li Zhu. "Simple fabrication of high focal number micro-lenses based on a microfluid pulse jetting method." Microsystem Technologies 24, no. 6 (January 16, 2018): 2789–802. http://dx.doi.org/10.1007/s00542-018-3721-9.

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36

Luo, Zhiwei, Yong He, Daoheng Sun, and Lingyun Wang. "Failure mechanism analysis and experimental study of lead zirconate titanate actuators in piezoelectric micro jetting valve." AIP Advances 10, no. 12 (December 1, 2020): 125306. http://dx.doi.org/10.1063/5.0032438.

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37

Hu, Liang, Yanshen Fang, Lei She, Rui Su, and Xin Fu. "Dripping–jetting transition of liquid stream from plate-type micro-orifice affected by wetting and dewetting." Experimental Thermal and Fluid Science 122 (April 2021): 110302. http://dx.doi.org/10.1016/j.expthermflusci.2020.110302.

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38

Fallah, Kayvan, Moahammad Rahni, Alireza Mohammadzadeh, and Mohammad Najafi. "Drop formation in cross-junction micro-channel, using lattice Boltzmann method." Thermal Science 22, no. 2 (2018): 909–19. http://dx.doi.org/10.2298/tsci160322230f.

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Drop formation in cross-junction micro-channels is numerically studied using the lattice Boltzmann method with pseudo-potential model. To verify the simulation, the results are compared to previous numerical and experimental data. Furthermore, the effects of capillary number, flow rate ratio, contact angle, and viscosity ratio on the flow patterns, drop length, and interval between drops are investigated and highlighted. The results show that the drop forming process has different regimes, namely, jetting, drop, and squeezing regimes. Also, it is shown that increasing in the flow rate ratio in the squeezing regime causes increment in drop length and decrement in drops interval distance. On the other hand, the drops length and the interval between the generated drops increase as contact angle increases. Also, the drop length and distance between drops is solely affected by viscosity ratio.

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Li, Xiaoqiang, Guangming Zhang, Wenhai Li, Zun Yu, Kun Yang, and Hongbo Lan. "The Electric-Field-Driven Fusion Jetting 3D Printing for Fabricating High Resolution Polylactic Acid/Multi-Walled Carbon Nanotube Composite Micro-Scale Structures." Micromachines 11, no. 12 (December 21, 2020): 1132. http://dx.doi.org/10.3390/mi11121132.

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Existing 3D printing techniques are still facing the challenge of low resolution for fabricating polymer matrix composites, inhibiting the wide engineering applications for the biomedical engineering (biomimetic scaffolds), micro fuel cells, and micro-electronics. In order to achieve high resolution fabrication of polylactic acid (PLA)/multi-walled carbon nanotube (MWCNT) composites, this paper presents an electric-field-driven (EFD) fusion jetting 3D printing method by combining the mixing effect and material feeding of the micro-screw and the necking effect of Taylor cone by the EFD. The effects of main process parameters (the carbon loading, the voltage, the screw speed, and the printing speed) on the line width and the printing quality were studied and optimized. To demonstrate the printing capability of this proposed method, meshes with line width of 30 µm to 100 μm and 1 wt.% to 5 wt.% MWCNT for the application of conductive biomimetic scaffold and the anisotropic flexible meshes were prepared. The electrical properties were investigated to present the frequency dependence of the alternating current conductivity and the dielectric loss (tanδ), and the microstructures of printed structures demonstrated the uniformly dispersed MWCNT in PLA matrix. Therefore, it provides a new solution to fabricate micro-scale structures of composite materials, especially the 3D conductive biomimetic scaffolds.

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Castro-Sastre, María Ángeles, Cristina García-Cabezón, Ana Isabel Fernández-Abia, Fernando Martín-Pedrosa, and Joaquín Barreiro. "Comparative Study on Microstructure and Corrosion Resistance of Al-Si Alloy Cast from Sand Mold and Binder Jetting Mold." Metals 11, no. 9 (September 8, 2021): 1421. http://dx.doi.org/10.3390/met11091421.

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This investigation is focused on the corrosion evaluation of an as-cast Al-Si alloy, obtained by two different casting methods: traditional sand casting and three-printing casting, using a binder jetted mold. The experimental results are discussed in terms of chemical composition, microstructure, hardness, and corrosion behavior of two different casting parts. The microstructure and composition of the sample before and after the corrosion tests was analyzed using light microscopy (OM), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (DRX). The corrosion of the two processed castings was analyzed using anodic polarization (PA) test and electrochemical impedance spectroscopy (EIS) in an aerated solution of 3.5% by weight NaCl, similar to the seawater environment. After the corrosion process, the samples were analyzed by inductively coupled plasma/optical emission spectrometry (ICP/OES); the composition was used to determine the chloride solution after immersion times. The sample processed by binder jetting mold showed higher corrosion resistance with nobler potentials, lower corrosion densities, higher polarization resistance, and more stable passive layers than the sample processed by sand casting. This improvement of corrosion resistance could be related to the presence of coarse silicon particles, which decrease of cathodic/anodic ratio and the number of micro-galvanic couples, and the lower amount of intermetallic β Al-Fe-Si phase observed in cast alloy solidified in binder jetting mold.

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Liang, Y. N., Xuechuan Shan, P. W. Gian, B. K. Lok, and C. W. Lu. "Micro-ink-jetting of silver nanoparticles on low temperature cofired ceramic substrates for drop-on-demand metallization." Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures 27, no. 3 (2009): 1431. http://dx.doi.org/10.1116/1.3093921.

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Lu, Shizhou, Wei Liu, Chenyu Zhu, Qiang Zhai, and Renshui Cao. "Precision Displacement Control of a Diamond-shaped Amplifying Mechanism Driven by Piezoelectric Actuator Based on Fuzzy Fractionalorder PIλDμ Controller." Current Nanoscience 15, no. 6 (October 11, 2019): 596–605. http://dx.doi.org/10.2174/1573413715666181212141714.

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Background: As a high-performance functional material, stacked piezoelectric actuator can produce a displacement under the effect of changing voltage. Its advantages of fast response and easy operation make it to be widely applied in the precision structure field. However, its small displacement stroke and hysteresis nonlinearity affect the accuracy of the output. : In the next step, some experiments were undertaken based on the constructed platform. Methods: In order to enlarge the displacement of piezoelectric actuator and reduce the influence of hysteresis, this study designs a diamond-shaped amplifying mechanism to amplify the output of the piezoelectric actuator, and then develops a self-tuning fuzzy fractional-order PIλDμ controller for the high precision displacement control of the proposed amplifying mechanism. After analyzing the working principle and modeling the amplifying mechanism, the fractional-order PIλDμ control model of the proposed mechanism was built and discretized according to the theoretical base of the fractional calculus in the time domain. Moreover, the fuzzy control algorithm was also introduced to achieve self-turning of parameters. Besides, the amplifying mechanism was also adopted for a microdroplet jetting dispenser to verify the practicability of the mechanism and control strategy. In the next step, some experiments were undertaken based on the constructed platform. Results: Experiments show that the displacement overshoots, the times of reaching a steady state of the traditional integer-order controller and the fractional-order controller are 5.08%, 1.17% and 17.25 s, 12.00 s, respectively. However, the fuzzy PIλDμ controller lowers the overshoot and the time of reaching a steady state to 0.95% and 9.00 s, respectively. The control algorithm can not only improve the follow-ability of the output displacement of the proposed mechanism, but also maintain the deviation within the range of 0.4% after the displacement stroke is stable and reduce the entering time of the mechanism up to 47.8%. In actual application, the droplet volume of micro-droplet jetting dispenser under fuzzy fractional-order PID control method is more stable, and its repeatability accuracy can reach up to 1.6475%. Conclusion: Experimental results indicate that the self-tuning fuzzy fractional-order PIλDμ controller can significantly improve the tracking performances of the PID and the integer-order PID with regard to the amplifying mechanism with the advantages of good dynamic character and regulation precision. Furthermore, the diamond-shaped amplification mechanism and control strategy can be applied for some micro-droplet jetting dispensers used in microelectronic packaging, life science and 3D printing fields.

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Hong, Shane Y. "Economical and Ecological Cryogenic Machining." Journal of Manufacturing Science and Engineering 123, no. 2 (September 1, 1999): 331–38. http://dx.doi.org/10.1115/1.1315297.

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To eliminate health and environmental problems caused by using conventional cutting fluid in the machining industry, a new economical and practical approach to cryogenic machining technology was developed. Using micro nozzle jetting to the cutting point locally, this approach minimizes the amount of liquid consumption to levels at which nitrogen costs less than conventional cutting fluid. It reduces tool wear and lengthens tool life up to five times, thereby allowing for high-speed cutting, improving productivity and reducing overall production cost. In addition, this approach reduces the frictional force, improves chip breaking, eliminates build-up edge, and improves surface quality. This paper discloses the new cryogenic machining approach, and assesses the econom- ics of the process in comparison with state-of-the-art conventional emulsion cooling.

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Tuong, Vu Manh, Nguyen Van Huyen, Nguyen Trong Kien, and Nguyen Van Dien. "Durable Epoxy@ZnO Coating for Improvement of Hydrophobicity and Color Stability of Wood." Polymers 11, no. 9 (August 23, 2019): 1388. http://dx.doi.org/10.3390/polym11091388.

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The hydrophobicity and color stability of wood are important properties that can be easily changed when wood is used as a raw material for outdoor products, reducing the service life of wood. Herein, an epoxy@ZnO coating was applied by a two-step simple spray coating method to improve the hydrophobicity and color stability of Styrax tonkinensis wood. The hydrophobicity, robustness of coating, as well as the color stability of uncoated wood samples and epoxy@ZnO coated wood samples were evaluated. The microstructure morphology and crystal structures of the coating were also characterized by a field-emission scanning electron microscope (FESEM) and X-ray diffraction (XRD) analysis, respectively. Results showed that the obtained epoxy@ZnO coating was not only superhydrophobic with an average water contact angle of 154.1°, but also maintained superhydrophobicity with an average water contact angle of 149.6° after five water jetting tests. The color stability of the coated wood samples was improved by around 50% compared to that of uncoated wood samples. Additionally, a continuous epoxy@ZnO coating with hierarchical micro/nanoscale structures constructed by the wurtzite hexagonal structure of ZnO micro/nanoparticles on wood surfaces was confirmed.

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Luo, Zhiwei, Gaofeng Zheng, and Lingyun Wang. "A Study on the Influence of the Nozzle Lead Angle on the Performance of Liquid Metal Electromagnetic Micro-Jetting." Micromachines 7, no. 12 (December 5, 2016): 220. http://dx.doi.org/10.3390/mi7120220.

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Dong, Bin, Xiani Huang, Xiaogang Yang, Guang Li, Lan Xia, and George Chen. "Rapid preparation of high electrochemical performance LiFePO4/C composite cathode material with an ultrasonic-intensified micro-impinging jetting reactor." Ultrasonics Sonochemistry 39 (November 2017): 816–26. http://dx.doi.org/10.1016/j.ultsonch.2017.06.010.

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Fan, Jing Ming, and Jun Wang. "A Visualization Study of Abrasive Flow Variation in Abrasive Air Jets." Advanced Materials Research 652-654 (January 2013): 2123–28. http://dx.doi.org/10.4028/www.scientific.net/amr.652-654.2123.

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Abrasive jet machining is an efficient technology for the fabrication of three dimensional micro structures on brittle materials. In abrasive jet machining, the variation or fluctuation in the amount of abrasive supply has a significant effect on the quality of the machined structures. An image processing technique is employed in this study to study the abrasive flow rate variation, in which abrasive jet pictures are captured at different moments by a Particle Image Velocimetry technology and then processed using Labview Vision Assistant and MATLAB. It shows that the abrasive flow rate fluctuates with time under the jetting conditions considered. The abrasive flow from larger nozzles or at smaller air pressures shows more profound fluctuation. Although the abrasive flow fluctuation from smaller nozzles remains almost constant when the air pressure is changed, for larger nozzles, the magnitude of the fluctuation gradually decreases as the air pressure is increased.

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Yazdi, Mohammad Ali, Elien Dejager, Mats Debraekeleer, Elke Gruyaert, Kim Van Tittelboom, and Nele De Belie. "How concrete removal techniques affect the bonding between concrete and repair mortar." MATEC Web of Conferences 289 (2019): 02008. http://dx.doi.org/10.1051/matecconf/201928902008.

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Many bonding failures between the substrate and repair mortar are attributed to too aggressive removal of the contaminated concrete and incorrect use of repair materials. To this end, in this study the effect of concrete removal techniques on substrates of different compositions and, as a result, on the bonding with repair mortar has been investigated. Substrate surfaces of different concrete compositions, micro-concrete (MC) and crushed stone concrete (CC), were treated by using three commonly used techniques: grit blasting (GB), jack-hammering (JH), and hydrodemolition/water-jetting (WJ). Automated Laser Measurements (ALM), sand patch tests and surface tensile strength measurements were applied to characterize the substrate surface. According to the results, the co-lateral effects of removal techniques such as WJ are dependent on the concrete mix composition. Moreover, WJ- and JH- treated samples achieved a lower surface tensile strength and bond strength compared to GB-treated slabs.

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Gao, Li, Cuidi Li, Fangping Chen, and Changsheng Liu. "Fabrication and characterization of toughness-enhanced scaffolds comprising β -TCP/POC using the freeform fabrication system with micro-droplet jetting." Biomedical Materials 10, no. 3 (June 24, 2015): 035009. http://dx.doi.org/10.1088/1748-6041/10/3/035009.

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Kirchebner, Benedikt, Maximilian Ploetz, Christoph Rehekampff, Philipp Lechner, and Wolfram Volk. "Influence of Salt Support Structures on Material Jetted Aluminum Parts." Materials 14, no. 15 (July 21, 2021): 4072. http://dx.doi.org/10.3390/ma14154072.

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Like most additive manufacturing processes for metals, material jetting processes require support structures in order to attain full 3D capability. The support structures have to be removed in subsequent operations, which increases costs and slows down the manufacturing process. One approach to this issue is the use of water-soluble support structures made from salts that allow a fast and economic support removal. In this paper, we analyze the influence of salt support structures on material jetted aluminum parts. The salt is applied in its molten state, and because molten salts are typically corrosive substances, it is important to investigate the interaction between support and build material. Other characteristic properties of salts are high melting temperatures and low thermal conductivity, which could potentially lead to remelting of already printed structures and might influence the microstructure of aluminum that is printed on top of the salt due to low cooling rates. Three different sample geometries have been examined using optical microscopy, confocal laser scanning microscopy, energy-dispersive X-ray spectroscopy and micro-hardness testing. The results indicate that there is no distinct influence on the process with respect to remelting, micro-hardness and chemical reactions. However, a larger dendrite arm spacing is observed in aluminum that is printed on salt.

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