Temporally‐resolved inkjet drop impaction on surfaces

Dong, Hongming; Carr, Wallace W.; Bucknall, David G.; Morris, Jeffrey F.

doi:10.1002/aic.11283

Cited by 104 publications

(85 citation statements)

References 23 publications

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“…Zhou et al (2014) proposed a phase-field LBM model to simulate interface dynamics of droplets impingement. The simulation results demonstrated a good agreement with the continuous phase-field CFD simulation results and the experimental results of Dong et al (2007). Multiple droplets impingement and interactions were further studied in three dimensions, which demonstrated the LBM model had the capability for handling highly complicated interface dynamics.…”

Section: Introductionsupporting

confidence: 70%

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Lattice Boltzmann simulation of multiple droplets impingement and coalescence in an inkjet-printed line patterning process

Cheng

Zhu

Zhang

et al. 2017

International Journal of Computational Fluid Dynamics

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Three-dimensional computations on the basis of the index-function lattice Boltzmann method are performed to simulate the process of multiple droplets impinging and coalescing into a line pattern on a solid substrate. The employed calculation model is validated by theoretical calculated values and experimental data from the literature. The influences of the equilibrium contact angle, droplet spacing and impinging velocity on the droplets impingement and coalescence behaviours are investigated. Numerical results demonstrate the width of the formed line depends significantly on the equilibrium contact angle and droplet spacing. The droplet spacing plays a significant role in controlling the coalescence moment of multiple droplets. The resolution of the printed pattern can be slightly increased with increase in impinging velocity.

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Section: Introductionsupporting

confidence: 70%

“…The Reynolds number and Weber number are set at 241 and 12.8, respectively, which are consistent with the experimental parameters in Dong et al (2007). Equation (17) indicates that the equilibrium contact angle has an effect on the diameter of the spherical cap.…”

Section: Model Validationssupporting

confidence: 54%

Lattice Boltzmann simulation of multiple droplets impingement and coalescence in an inkjet-printed line patterning process

Cheng

Zhu

Zhang

et al. 2017

International Journal of Computational Fluid Dynamics

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“…These dimensionless numbers were chosen to lie within the operating parameters found in most commercially available inkjet printers, e.g., for typical inkjet printing systems ρ ≈ 1000 kg/m 3 , r 0 ≈ 50 μm, v = 5 m/s, μ = 10 mPa s, and σ = 45 mN/m. It has been demonstrated that the behavior of impacting droplets of different sizes and temporal scales can be compared using the dimensionless time to reach the maximum spreading diameter and by scaling the time by 2r 0 /v, [44].…”

Section: Resultsmentioning

confidence: 99%

Mixing and internal dynamics of droplets impacting and coalescing on a solid surface

et al. 2013

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The coalescence and mixing of a sessile and an impacting liquid droplet on a solid surface are studied experimentally and numerically in terms of lateral separation and droplet speed. Two droplet generators are used to produce differently colored droplets. Two high-speed imaging systems are used to investigate the impact and coalescence of the droplets in color from a side view with a simultaneous gray-scale view from below. Millimeter-sized droplets were used with dynamical conditions, based on the Reynolds and Weber numbers, relevant to microfluidics and commercial inkjet printing. Experimental measurements of advancing and receding static contact angles are used to calibrate a contact angle hysteresis model within a lattice Boltzmann framework, which is shown to capture the observed dynamics qualitatively and the final droplet configuration quantitatively. Our results show that no detectable mixing occurs during impact and coalescence of similar-sized droplets, but when the sessile droplet is sufficiently larger than the impacting droplet vortex ring generation can be observed. Finally we show how a gradient of wettability on the substrate can potentially enhance mixing.

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“…S8 and Supplementary Methods) whereas electric forces are not found to notably enhance impact spreading (Supplementary Table S1 and Supplementary Methods). Hence, a droplet will initially be deposited on the substrate with a diameter similar to that of its spherical state, and only afterwards, capillarity-driven wetting will slowly increase its diameter 18 (Supplementary Methods). The observed equality of droplet and footprint sizes implies that, in our case, nanoparticle settling occurs before the longer wetting phase.…”

Section: Working Principle and Set-upmentioning

confidence: 99%

Direct printing of nanostructures by electrostatic autofocussing of ink nanodroplets

et al. 2012

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nanotechnology, with its broad impact on societally relevant applications, relies heavily on the availability of accessible nanofabrication methods. Even though a host of such techniques exists, the flexible, inexpensive, on-demand and scalable fabrication of functional nanostructures remains largely elusive. Here we present a method involving nanoscale electrohydrodynamic ink-jet printing that may significantly contribute in this direction. A combination of nanoscopic placement precision, soft-landing fluid dynamics, rapid solvent vapourization, and subsequent self-assembly of the ink colloidal content leads to the formation of scaffolds with base diameters equal to that of a single ejected nanodroplet. The virtually material-independent growth of nanostructures into the third dimension is then governed by an autofocussing phenomenon caused by local electrostatic field enhancement, resulting in large aspect ratio. We demonstrate the capabilities of our electrohydrodynamic printing technique with several examples, including the fabrication of plasmonic nanoantennas with features sizes down to 50 nm.

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Temporally‐resolved inkjet drop impaction on surfaces

Cited by 104 publications

References 23 publications

Lattice Boltzmann simulation of multiple droplets impingement and coalescence in an inkjet-printed line patterning process

Lattice Boltzmann simulation of multiple droplets impingement and coalescence in an inkjet-printed line patterning process

Mixing and internal dynamics of droplets impacting and coalescing on a solid surface

Direct printing of nanostructures by electrostatic autofocussing of ink nanodroplets

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