Microdroplets Impinging on Freely Suspended Smectic Films: Three Impact Regimes

Dölle, Sarah; Stannarius, Ralf

doi:10.1021/acs.langmuir.5b00756

Cited by 6 publications

(3 citation statements)

References 50 publications

(82 reference statements)

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“…The system of a liquid drop impacting a suspended film was believed to have many potential applications in the future. [27][28][29] In this study, we aim to investigate the collision of a soap droplet with a soap film in a high-We region. The focus was the phenomena after the droplet totally passing through the film.…”

Section: Introductionmentioning

confidence: 99%

Droplets passing through a soap film

et al. 2017

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Here, we report an experimental study of droplets colliding with a soap film. The behavior of the droplet is found to be dependent on the impact velocity. The threshold for a droplet to pass through the soap film is influenced by the droplet diameter. The contact time decreases with increasing impact velocity. Emphasis is placed on whether the outer shell remains intact. When the dimensionless contact time approaches 1, collapse of the shell begins. However, the shell does not collapse with further increasing impact velocity.

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Section: Introductionmentioning

confidence: 99%

Droplets passing through a soap film

et al. 2017

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“…Finally we emphasize that the segregation behavior predicted by our simulations can in principle be verified in experiments using smectic shells of molecular crystals [49][50][51][52][53][54][55][56][57][58] or Pickering emulsion droplets covered with rod-like colloids [59][60][61][62][63][64] . Another option are layers of silica rods which are recently studied under various constraints 65,66 , aspherical surfactants 67 or ellipsoidal colloids bound to curved fluid-fluid interfaces 68 .…”

Section: Discussionmentioning

confidence: 76%

Length segregation in mixtures of spherocylinders induced by imposed topological defects

Allahyarov

Löwen

2018

Soft Matter

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We explore length segregation in binary mixtures of spherocylinders of lengths L 1 and L 2 with the same diameter D which are tangentially confined on a spherical surface of radius R. The orientation of spherocylinders is constrained along an externally imposed direction field on the sphere which is either along the longitude or the latitude lines of the sphere. In both situations, integer orientational defects at the poles are imposed. We show that these topological defects induce a complex segregation picture also depending on the length ratio factor γ=L 2 /L 1 and the total packing fraction η of the spherocylinders. When the binary mixture is aligned along longitudinal lines of the sphere, shorter rods tend to accumulate at the topological defects of the polar caps whereas longer rods occupy central equatorial area of the spherical surface. In the reverse case of latitude ordering, a state can emerge where longer rods are predominantly both in the cap and in the equatorial areas and shorter rods are localized in between. As a reference situation, we consider a defect-free situation in the flat plane and do not find any length segregation there at similar γ and η, hence the segregation is purely induced by the imposed topological defects. It is also revealed that the shorter rods at γ=4 and η ≥0.5 act as obstacles to the rotational relaxation of the longer rods when all orientational constraints are released.

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“…At the end of this wetting phase, the droplet reaches equilibrium, i.e., the velocity of the contact line between the droplet and the surface becomes zero. These findings of Rioboo et al [21] and Schiaffino and Sonnin [20] have been used in several recent studies [25][26][27][28][29] investigating the droplet spreading phenomenon on a variety of surfaces. Figure 3a shows the schematic of the experimental setup used to perform the high-speed imaging studies on the droplets.…”

Section: Droplet Spreading Behaviorsmentioning

confidence: 96%

Droplet spreading characteristics observed during 3D printing of aligned fiber-reinforced soft composites

Picha¹,

Spackman²,

Samuel³

2016

Additive Manufacturing

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The 3D printing of fiber-reinforced soft composites (FrSCs) is a hybrid process that combines conventional inkjet-based 3D printing with the directed deposition of electrospun polymer fiber mats. This paper investigates the spreading characteristics of droplets when deposited on fibrous substrates, under conditions relevant to 3D printing of aligned FrSCs. Both single and multidroplet impingement studies are conducted on substrates with varying fiber number densities. High-speed imaging is used to study the characteristic time-scales and the spreading behavior of the droplets. The single droplet impingement studies on stationary substrates reveal that the presence of fibers promotes droplet spreading along the length the fibers. Occasional surface energy variations in the fiber mats in the form of voids and fiber bundles are also seen to affect the droplet shape and the characteristic spreading times. In the case of a moving substrate, the droplets are seen to spread the most during in-line printing, i.e., when the direction of the printing velocity coincides with the direction of fiber alignment. They spread the least during orthogonal printing, i.e., when the direction of the printing velocity is perpendicular to the direction of fiber alignment. The printing of straight lines shows an interesting edge retraction phenomenon that gets accentuated the most in the case of in-line printing. The findings of the high-speed imaging studies have been confirmed by 3D printing comparable artifacts using UV curable inks. These studies indicate that for a given fiber mat and UV curable ink combination, the choice of the in-line or orthogonal printing strategy has implications for the overall printing time, fiber content, edge resolution and surface quality of the 3D printed FrSC part.

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Microdroplets Impinging on Freely Suspended Smectic Films: Three Impact Regimes

Cited by 6 publications

References 50 publications

Droplets passing through a soap film

Droplets passing through a soap film

Length segregation in mixtures of spherocylinders induced by imposed topological defects

Droplet spreading characteristics observed during 3D printing of aligned fiber-reinforced soft composites

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