surface tension – TechConnect Briefs

Optimized Surface Patterning Tools for Sub-attoliter Volume Fluid Deposition

Adams M.L., University of South Alabama, US

Micromachined cantilever-based surface patterning tools were optimized to allow submicron diameter printing of fluids on various surfaces. A detailed fluidics model was used to analyze critical variables and determine the best method for optimization. Tools [...]

The Investigation of Electrostatic Induced Inkjet Printing System for the Ejection of a Stable Micro/Nano Droplet

Choi J., Kim Y.J., Son S.U., Chul An K., Lee S., Sungkyunkwan University, KR

Inkjet printing technology has recently attracted considerable attention for a simple fabrication and advanced pattering process during the past decade. In order to manufacture advanced inkjet printing technology, my team has alternatively proposed and investigated [...]

A Hydrophobicity Controlled Nanofluidic Pump

Liu H., Dharmatilleke S., Tay A.A.O., Institute of Materials Research and Engineering, SG

interfacial energies in the system. Many methods for modulation of surface tension to manipulate fluids in micro or nano scale have been studied and reported, including the mechanical (surface roughness effect), chemical (electrochemical effect), opto- [...]

Analysis of the Liquid Mediated Friction during Alignment in NIL Process

Kang S-H, Park S.H., Lee W.I., Seoul National University, KR

When Nano-Imprint Lithography (NIL) process is adopted in the large area applications like display, the stiction phenomenon which is the adhesion or in-plane friction between mold and substrate to disturb fine alignment process can be [...]

Numerical Simulation of NIL Process Based on Continuum hypothesis

Kim S.M., Woo Y.S., Lee D.E., Lee W.I., Lee D.E., Lee W.I., Seoul Nat'l Univ., KR

Nano imprint lithography(NIL) is a cost-efficient, high-throughput processing technique to transfer nano-scale patterns onto thin polymer films. Polymers used as the resist include UV cured resins as well as thermoplastics such as polymethyl-methacrylate(PMMA). In this [...]

Three-Dimensional Transient Motion of Spherical and Deformable Droplet in L-Shaped Rectangular Microchannel

Kang C.W., Hua J.S., Lou J., Institute of High Performance Computing, SG

Three-dimensional transient motion of spherical and small deformable droplet in an L-shaped rectangular channel is investigated numerically. The methodology employed is front tracking coupled with the parallel adaptive refinement meshing code, referred as PARAMESH. The [...]

Modeling multi-scale liquid dispersion phenomena in conjunction with Computational Fluid Dynamics

Mohan S., Haidari A., Mukopadhyay A., Fluent, Inc., US

Mixing of fluid in different geometric scales dominates variety of real life applications ranging from engineering chemicals, food materials, pharmaceutical products to biological organs. In this presentation we will address coupling of continuum scales in [...]

Thermal Modulation and Instability of Viscous Microjets

Furlani E.P., Eastman Kodak Company, US

Liquid microjets are inherently unstable and can be broken into droplets by various means including the modulation of pressure, velocity, and/or fluid properties. In this presentation we discuss the controlled breakup of viscous microjets via [...]

Quasi-static Motion of Bubbles in Microchannel Contractions

Jensen M.J., Goranovic G., Bruus H., Technical University of Denmark, DK

We present a thorough theoretical and computational study of bubble dynamics in icrofluidic channels with contractions. We investigate the effects of geometry and surface physics (friction and contact angle) on the behavior of incompressible bubbles, [...]

Modeling of Surface Tension in Fluidic MEMS Using the Level-Set Method

Takahashi K., Kyushu University, JP

Mixed state of liquid and gas is frequently seen in fluidic MEMS, for example, ink jet printer, heat exchanger, thermo-capillary optical switch, and so on. The surface tension is the most dominant mechanical effect in [...]