| 1. |
- Reinhold, Ingo, 1981-, et al.
(författare)
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A hybrid approach combining 3D and conductive inkjet printing for the generation of linear ion traps for mass spectrometry applications
- 2014
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Ingår i: International Conference on Digital Printing Technologies. - : Society for Imaging Science and Technology. ; , s. 133-136, s. 133-136
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Konferensbidrag (refereegranskat)abstract
- Printed conductors have attracted strong interest in academia as well as the industry. While first applications using printed conductors on flat as well as curved surfaces are establishing in the market, extensive research still is conducted on the postprocessing technologies needed for high-volume fabrication of solution processed conductors. With regards to the potential low-cost, high-throughput manufacturing of conductors on inexpensive polymeric foils, new applications start to evolve that call for an even more elaborate investigation of the printing and post-processing steps included. This paper assesses the potential of inkjet-printed conductors for the use in low-pressure environments, such as linear ion-traps for mass spectrometry. In these environments remainders of trapped air or organic solvents affect the performance and lifetime of the getter pump systems used. Additionally, high frequency characteristics of the processed conductors are investigated as these are essential for the sensitivity of an ion trap. In this contribution we establish the framework for the application of conductive Inkjet printing on curved surfaces for sensing application in low-pressure environments. Inkjet-deposited nanoparticle inks were investigated with respect to their characteristics under vacuum conditions. The deposits on polymeric foils as well as on DLP processed three-dimensional semi-finished parts were subjected to thermal post-processing and measured with respect to their electrical characteristics as well as their outgassing behavior.
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| 2. |
- Reinhold, Ingo, et al.
(författare)
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Inkjet printing of phase-change materials with Xaar1001 printheads
- 2010
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Ingår i: NIP & Digital Fabrication Conference, 2010 International Conference on Digital Printing Technologies. - 9780892082933 ; , s. 319-322
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Konferensbidrag (refereegranskat)abstract
- Inkjet printing of phase-change or hot melt materials allows to produce etch masks by digital and additive processing, thus enabling highly efficient fabrication of printed circuit boards, solar cells etc. Previously the binary inkjet printing with drop volumes of 50 pL was demonstrated with Xaarl26 end-shooter printheads.[1] The present work describes new results on printing with XaarlOOl printheads. These printheads offer both, grayscale printing with a subdrop volume of 6 pL and excellent reliability by way of their unique'true throughflow' capability, respectively. While the advantage of grayscale printing for high-resolution patterning is obvious and straight forward, the complexity lies in the recirculating ink systems that provide the constant ink flow through the printhead channels. A narrow temperature range has to be established throughout the total ink path, which avoids hot spots that would damage the inks as well as cold spots that counteract the ink flow rate. Print results with Sunjet Crystal HEP9520, operating between 80 °C and 90 °C, clearly show good droplet formation for 7 distinct gray levels spanning a range from 5 to 37 pL with increments of 5.3 pL at a frequency of 5 kHz.
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| 3. |
- Voit, W., et al.
(författare)
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Application of inkjet technology for the deposition of magnetic nanoparticles to form micron-scale structures
- 2003
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Ingår i: IEE Proceedings - Science Measurement and Technology. - : Institution of Engineering and Technology (IET). - 1350-2344 .- 1359-7094. ; 150:5, s. 252-256
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Tidskriftsartikel (refereegranskat)abstract
- Inkjet printing technique has been applied to the production of magnetic layers and structures consisting of nanosized magnetic particles. These magnetic particles were synthesised by chemical methods and dispersed in suitable fluidic systems. The rheological parameters of the fluids were adjusted for inkjet printing. The resulting micron-scale pattern were obtained with a high reproducibility and structure control. The magnetic local structure of the patterns has been studied by using a new local 'in-plane' susceptibility measurement system as well as magnetic force microscopy. The deposited structures reveal a chain-like self-alignment of the magnetic particles. Potential applications of this fast and versatile process are the production of low- and medium-density magnetic mass storage patterns on almost any kind of substrate and for magnetic character recognition purposes. Printed patterns with minimal structure dimensions in the range of 50-100 mum are discussed. Work is in progress to decrease these dimensions by an order of magnitude by volume reduction of the deposited ink droplets.
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| 4. |
- Reinhold, Ingo, et al.
(författare)
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Measurement of inkjet printhead reliability by detecting every single droplet in flight
- 2016
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Ingår i: International Conference on Digital Printing Technologies. - : The Society for Imaging Science and Technology. - 9780892083220 ; , s. 60-63
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Konferensbidrag (refereegranskat)abstract
- Inkjet printing is adapted for many digital imaging systems including graphical, industrial and advanced manufacturing applications. Reliability was identified to be one of the key challenges for inkjet printheads due to their susceptibility to variations in temperature, ink consistency, debris or external vibration. Hence, lengthy tests with printouts on kilometers of papers are necessary to establish a measure of reliability, which is time-consuming and extends the development cycle for a given application. In this contribution a line-scan camera is used to observe all droplets from a printhead row in flight at full jetting frequency. This allows for the identification of missing droplets as a function of the printed image, external disturbances as well as the drive waveforms used and other print parameters. This provides a quantitative measurement not only of reliability but also of deviations in droplet velocity and trajectory in a laboratory environment. The paper discusses the necessary hard- and software approaches and details the necessity for various image transformations due to the challenges imposed by the illumination. Furthermore, we will present experimental data as well as speed benchmarks.
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| 5. |
- Reinhold, Ingo, et al.
(författare)
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Measurement of mass of single inkjet drops with a quartz crystal microbalance QCM
- 2012
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Ingår i: Int. Conf. Digit. Print. Technol.. - : The Society for Imaging Science and Technology. - 9780892083022 ; , s. 312-314
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Konferensbidrag (refereegranskat)abstract
- Monitoring inkjet performance requires control of parameters such as drop velocity, direction and drop volume. Present methods to determine drop volume utilize optical vision systems or calculation of an average drop mass from large numbers of drops on a precision balance. An alternative technique based on QCM (Quartz Crystal Microbalance) was assessed to measure the mass of single drops. Low-cost plano-convex 6 MHz AT-cut quartz resonators were used to measure single inkjet drops. Since the footprint of these ink drops is of the order 100 μm the QCM detector was used in a 'localized spot' measurement mode in contrast to the typical large area detection mode. The sensitivity of an inner 0.5 mm circle was determined to be 5.46 x 10-10 g/Hz for solid silver films. Single drops of an oil-based ink of 50 pL nominal volume were jetted using a Xaar126 piezo inkjet printhead onto the QCM target area and produced signals with a SNR better than 70:1. This paper presents the technical challenges relating to liquid droplet volume measurements using higher frequency oscillators.
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| 6. |
- Reinhold, Ingo, et al.
(författare)
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Novel developments in photonic sintering of inkjet printed functional inks
- 2013
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Ingår i: NIP29. - : The Society for Imaging Science and Technology. - 9780892083060 ; , s. 476-478
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Konferensbidrag (refereegranskat)abstract
- Inkjet printing of electrical tracks in roll-to-roll applications was hampered for a long time since nano-particle inks required thermal sintering at temperatures greater than 120 °C for several minutes. Among a large number of potential R2R compatible techniques, photonic sintering of inkjet-printed metal-based inks was shown to enable very fast sintering times and providing high quality of structural integrity and low electrical resistance [1]. While the above investigations were carried out with a low dutylow frequency irradiation source, novel developments allow for pulse shaping on the timescale of several microseconds and, therefore, the combination of drying and sintering pulses into a single piece of equipment. In this contribution the photonic sintering process was investigated numerically and experimentally for the case of inkjetprinted aqueous copper oxide ink and a Pulse Forge®3200 X2 tool, both implemented onto a NovaCentrix roll-to-roll machine. Our finding support the assumption, that pulse shaping and, therefore, energy tailoring as a function of time, is essential for efficient conversion of wet copper oxide deposits into conductive copper with no impact on the underlying substrate. The paper presents and discusses the resulting electrical resistances of features processed with a conventional hybrid solution using IRradiation for pre-drying as well as a single step drying and sintering using a single radiation source.
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| 7. |
- Voit, Wolfgang, et al.
(författare)
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Utilization of industrial inkjet technologies for the deposition of conductive polymers, functional oxides and CNTs
- 2011
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Ingår i: Materials Research Society Symposium Proceedings. - : Springer Science and Business Media LLC. - 9781618395399 ; , s. 43-50
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Konferensbidrag (refereegranskat)abstract
- Printing of functional materials requires reliable deposition processes. This work describes the development of printing processes for selected functional materials utilizing industrial-type inkjet printheads. A well-controlled printing process with fluids containing the conductive polymer poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) is presented, allowing linear printing speeds of up to 0.35 m/s in single-pass, and smallest line width of approximately 40 μm when printing 7 pL drop volumes. In addition reliable processes for producing ZnO-based films, which enable novel applications for electronic and UV-sensitive devices, and for printing of conductive carbon nanotube layers are shown.
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