Electrohydrodynamic instability of thin conductive liquid films

Wu, Xiang‐Fa; Dzenis, Yuris A.

doi:10.1088/0022-3727/38/16/017

Cited by 21 publications

(27 citation statements)

References 25 publications

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“…Similarly, when a liquid film is subjected to an electric field, the electrical stress at surface of the film generates different types of patterns such as regular and hierarchical columns, channels, holes, etc. A number of experimental [51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66]80 and theoretical [67][68][69][70][71][72][73][74][75][76][77][78][79][80]88 studies show that the instability in a viscous film occurs when the destabilizing electrical force dominates over the stabilizing surface tension force. Recent studies also reveal that the ordering of these microstructures can be controlled by placing a topographically patterned electrode from the top, which essentially leads to a spatially varying electric field.…”

Section: Introductionmentioning

confidence: 99%

Electric field induced microstructures in thin films on physicochemically heterogeneous and patterned substrates

Srivastava

Reddy

Wang

et al. 2010

The Journal of Chemical Physics

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We study by nonlinear simulations the electric field induced pattern formation in a thin viscous film resting on a topographically or chemically patterned substrate. The thin film microstructures can be aligned to the substrate patterns within a window of parameters where the spinodal length scale of the field induced instability is close to the substrate periodicity. We investigate systematically the change in the film morphology and order when (i) the substrate pattern periodicity is varied at a constant film thickness and (ii) the film thickness is varied at a constant substrate periodicity. Simulations show two distinct pathway of evolution when the substrate-topography changes from protrusions to cavities. The isolated substrate defects generate locally ordered ripplelike structures distinct from the structures on a periodically patterned substrate. In the latter case, film morphology is governed by a competition between the pattern periodicity and the length scale of instability. Relating the thin film morphologies to the underlying substrate pattern has implications for field induced patterning and robustness of inter-interface pattern transfer, e.g., coding-decoding of information printed on a substrate.

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Section: Introductionmentioning

confidence: 99%

Electric field induced microstructures in thin films on physicochemically heterogeneous and patterned substrates

Srivastava

Reddy

Wang

et al. 2010

The Journal of Chemical Physics

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“…Moreover, as one of the unique properties of nanomaterials, surface has appreciable effect on the stiffness of nanosized metallic and organic wires and films as was observed in experiments and also predicted by theoretical studies. [22][23][24][25][26][27][28] or decrease the corresponding moduli depending upon the specific material types and crystalline structures. For polymer materials, surface tension increased the moduli of ultrafine fibers and films as has been observed in experiments.…”

Section: Introductionmentioning

confidence: 99%

Size effect in polymer nanofibers under tension

Dzenis

2007

Journal of Applied Physics

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This article studies the size effect on the elastic behavior of solid and hollow polymer nanofibers ͑e.g., electrospun nanofibers͒ subjected to uniaxial tension. A one-dimensional nonlinear elastic tension model is proposed that takes into account the coupling effect of fiber elastic deformation and surface tension. The fiber axial force-displacement and stress-strain relations are obtained in explicit forms. It is shown that, at nanoscale, fiber radius has appreciable effect on the elastic response of polymer nanofibers. With consideration of the fiber radial effect, it is shown that the actual contribution of surface energy of the solid polymer fibers to the axial tensile force is r 0 ␥ rather than 2r 0 ␥ ͑where r 0 is the fiber radius after deformation and ␥ is the surface tension͒, as commonly used in literature. Compared to solid polymer fibers, the tensile behavior of hollow polymer nanofibers appears more complex with greater axial stiffening effect depending upon the combination effect of the fiber exterior and interior radii and the material properties. The results presented in this study can be utilized for data reduction of the nanoscale tension tests of polymer nanofibers and the analysis and design of nanofiber devices.

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“…Continuous carbon nanofibers will be produced from polyacrylonitrile (PAN) 13 precursors. The nanofibers will be characterized by a variety of analytical and thermomechanical techniques.…”

Section: Nanomanufacturing Of High-performance Nanofibers For Next Gementioning

confidence: 99%

High-Performance Digital Imaging System for Development and Characterization of Novel Materials and Processes

Dzenis¹,

Feng²

2006

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information AFRL-SR-AR-TR-07-00 7 7 SUPPLEMENTARY NOTES ABSTRACTThe objective of this DURIP project was to acquire a new high-performance digital imaging system for visualization and quantitative characterization of high-speed dynamic fracture in advanced composite materials and flow instabilities in nanomanufacturing processes. Full-field dynamic stress analysis of fracture required high spatial resolution while ballistic processes needed ultrahigh-speed imaging.Observations of jet motion and instabilities in nanofiber manufacturing required flexible frame rate and long time (high frame number) videography. As a result of thorough market search, a system of three cameras was selected and acquired, including ultrahigh-spatial resolution Model 550-24 rotating mirror CCD camera by Cordin, ultrahigh-speed Model 214-8 image-intensified gated CCD camera by Cordin, and flexible, ultrahigh-frame number HG-I 00K color CMOS camera by Redlake. The cameras have overlapping resolution, recording rate/length, and sensitivity performance characteristics. This unique, state-of-the-art ultrahigh-resolution/speed imaging system will be used for quantitative experimental characterization of impact fracture and ballistic performance of novel advanced laminated composites with nanofiber-reinforced ply interfaces and for observation of electrohydrodynamic jet instabilities in electrospinning process. The objective of this DURIP project was to acquire a new ultrahigh-performance digital imaging system for visualization and quantitative characterization of high-speed dynamic fracture in advanced composite materials and flow instabilities in nanomanufacturing processes. Full-field dynamic stress analysis of fracture required high spatial resolution while ballistic processes needed ultrahigh-speed imaging. Observations of jet motion and instabilities in nanofiber manufacturing by electrospinning required flexible frame rate and long time (high frame number) videography. As a result of a thorough market search, it was concluded that no single camera was capable of satisfying these conflicting requirements. A system of three cameras was selected and acquired. The system included an ultrahigh-spatial resolution Model 550-24 rotating mirror CCD camera by Cordin, an ultrahigh-speed Model 214-8 image-intensified gated CCD camera by Cordin, and a flexible, ultrahigh-frame number HG-1OOK color CMOS camera by Redlake. These cameras have overlapping resolution, recording rate/length, and sensitivity performance characteristics. Together, they r...

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Electrohydrodynamic instability of thin conductive liquid films

Cited by 21 publications

References 25 publications

Electric field induced microstructures in thin films on physicochemically heterogeneous and patterned substrates

Electric field induced microstructures in thin films on physicochemically heterogeneous and patterned substrates

Size effect in polymer nanofibers under tension

High-Performance Digital Imaging System for Development and Characterization of Novel Materials and Processes

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