Inkjet printing of viscoelastic polymer inks

A novel approach to a fully inkjet printed SnO2-based gas sensor on a flexible foil

“…The imposition of an increasing electrical potential on the piezoelectric membrane results in a higher drop ejection rate, leading to a straight ejections with longer ligament behind the spherical portion of the drop. This behavior is characteristic of the inkjet printing of a low molecular weight viscoelastic polymer [45].…”

Absolute instability of free-falling viscoelastic liquid jets with surfactants

“…Two special cases exist: the first case is when λ = 0, λr = 0, and μp = 0, the Oldroyd-B model reduces to the linear constitutive equation for Newtonian fluids, and the second case is when λ ≠ 0, λr = 0, and μs = 0, this model reduces to the upperconvected Maxwell (UCM) model for pure polymers 26,27 (this model has several properties of polymer solutions that can be captured to a good first approximation). Therefore, from the second case, the constitutive equation, (1), can be written as…”

Convective and absolute instability of viscoelastic liquid jets in the presence of gravity

“…8. We have checked that the cusp point (ω 0 ) and the saddle point (k 0 ) satisfy the saddle point conditions, which are D(ω 0 , k 0 ) = ∂D(ω 0 , k 0 )/∂k = 0 and ∂ 2 D(ω 0 , k 0 )/∂k 2 ≠ 0. 20,49 C. Finding the convective/absolute instability boundary (CAIB)…”

“…The instability, and subsequent disintegration, of a column of fluid is of interest in a wide variety of growing applications (such as ink jet printing, 2 nanofiber, 3 needle-free injection, 4 coating, and even diesel engine technology 5 ). Despite over 200 years of scientific scrutiny, the instability of a liquid jet remains an active area of study for many researchers from a wide range of scientific disciplines.…”