Viscous entrainment on hairy surfaces

Nasto, Alice; Brun, Pierre-Thomas; Hosoi, A. E.

doi:10.1103/physrevfluids.3.024002

Cited by 21 publications

(21 citation statements)

References 15 publications

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“…Optical Pumping Experiments : A Q‐switched, frequency‐doubled Nd:YAG laser (532 nm wavelength, 1–10 Hz repetition rate, 5 ns pulse width) with a 3 mm pump beam diameter was used to pump the samples at an angle of 45° to the normal to the front face of the sample, which was adhered to a glass slide by immersion oil and the slide was mounted vertically. The dye liquid remained in position during the experiments, due to its viscosity and the entrainment by the nanoneedles . A lens ( f = 5 cm) was placed at 30° to the normal in front of the sample to collect emission light to a fiber‐coupled spectrometer (Ocean Optics, USB2000 UV‐VS‐ES ≈1 nm resolution).…”

Section: Methodsmentioning

confidence: 99%

“…The dye liquid remained in position during the experiments, due to its viscosity and the entrainment by the nanoneedles. [29,30] A lens (f ¼ 5 cm) was placed at 30 to the normal in front of the sample to collect emission light to a fiber-coupled spectrometer (Ocean Optics, USB2000 UV-VS-ES %1 nm resolution). A 532 nm edge filter was used to block residual pump light from the spectrometer.…”

Section: Methodsmentioning

confidence: 99%

“…To realize a diamond‐based random laser, we engineered disordered nanoscale diamond pillars with a high density using reactive ion etching (RIE), and used a fluorescent dye solution as the gain medium. The diamond nanoneedles act as scatterers for the random lasing process, and also trap the fluorescent dye solution via capillary action and viscous entrainment . These two properties are favorable for the realization of random lasing using an unpatterned mask and fast fabrication process.…”

Section: Specific Reactive Ion Etching Conditions Used On Different Dmentioning

confidence: 99%

“…The diamond nanoneedles act as scatterers for the random lasing process, and also trap the fluorescent dye solution via capillary action and viscous entrainment. [29,30] These two properties are favorable for the realization of random lasing using an unpatterned mask and fast fabrication process. Figure 1a shows a schematic of our device.…”

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confidence: 99%

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A Random Laser Based on Hybrid Fluorescent Dye and Diamond Nanoneedles

Duong

Regan

Toth

et al. 2018

Physica Rapid Research Ltrs

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Random lasers use radiative gain and multiple scatterers in disordered media to generate light amplification. In this study, a random laser based on diamond nanoneedles that act as scatterers in combination with fluorescent dye molecules that serve as a gain medium has been demonstrated. Random lasers realized using diamond possess high spectral radiance with angle‐free emission and thresholds of 0.16 mJ. The emission dependence on the pillar diameter and density is investigated, and optimum lasing conditions are measured for pillars with spacing and density of ≈336 ± 40 nm and ≈2.9 × 1010 cm−2. Our results expand the application space of diamond as a material platform for practical, compact photonic devices, and sensing applications.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Specific Reactive Ion Etching Conditions Used On Different Dmentioning

confidence: 99%

mentioning

confidence: 99%

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A Random Laser Based on Hybrid Fluorescent Dye and Diamond Nanoneedles

Duong

Regan

Toth

et al. 2018

Physica Rapid Research Ltrs

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“…They are present in organisms ranging from plants to mammals, birds, and insects. Their functions range from temperature control ( 1 ) to sensing ( 2 ), cleaning ( 3 ), adhering ( 4 ), flying ( 5 , 6 ), and feeding ( 7 , 8 ). A number of these functions rely on hydrodynamic interactions between the fibrous structures and the surrounding fluid.…”

Section: Introductionmentioning

confidence: 99%

Fibrous Flagellar Hairs of Chlamydomonas reinhardtii Do Not Enhance Swimming

Amador

Wei

Tam

et al. 2020

Biophysical Journal

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The flagella of Chlamydomonas reinhardtii possess fibrous ultrastructures of a nanometer-scale thickness known as mastigonemes. These structures have been widely hypothesized to enhance flagellar thrust; however, detailed hydrodynamic analysis supporting this claim is lacking. In this study, we present a comprehensive investigation into the hydrodynamic effects of mastigonemes using a genetically modified mutant lacking the fibrous structures. Through high-speed observations of freely swimming cells, we found the average and maximum swimming speeds to be unaffected by the presence of mastigonemes. In addition to swimming speeds, no significant difference was found for flagellar gait kinematics. After our observations of swimming kinematics, we present direct measurements of the hydrodynamic forces generated by flagella with and without mastigonemes. These measurements were conducted using optical tweezers, which enabled high temporal and spatial resolution of hydrodynamic forces. Through our measurements, we found no significant difference in propulsive flows due to the presence of mastigonemes. Direct comparison between measurements and fluid mechanical modeling revealed that swimming hydrodynamics were accurately captured without including mastigonemes on the modeled swimmer’s flagella. Therefore, mastigonemes do not appear to increase the flagella’s effective area while swimming, as previously thought. Our results refute the longstanding claim that mastigonemes enhance flagellar thrust in C. reinhardtii , and so, their function still remains enigmatic.

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Morphological specialization to nectarivory in Phyllostomus discolor (Wagner, 1843) (Chiroptera: Phyllostomidae)

Quinche

Santana

Rico‐Guevara

2022

The Anatomical Record

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Dedicated nectarivory is a derived feeding habit that requires specialized cranial and soft‐tissue morphologies to extract nectar from flowers. Nectarivory has evolved many times in terrestrial vertebrates, and in four bat families (Pteropodidae, Phyllostomidae, Vespertilionidae, and Mystacinidae). Within phyllostomids, specializations to nectarivory have been well documented in two subfamilies, Glossophaginae and Lonchophyllinae. However, nectarivory has also evolved independently in the genus Phyllostomus (subfamily Phyllostominae). Since Phyllostomus species have an omnivorous diet with a high consumption of nectar, they can be used to explore the basic morphological modifications linked to evolving a nectarivorous habit. Here, we focused on describing and comparing the morphological features potentially associated with nectarivory in Phyllostomus discolor. We present the first detailed tongue and palate morphological descriptions for P. discolor and perform skull morphometric analysis including 10 species. We found hair‐like papillae on the tongue of P. discolor, a convergent feature with Glossophaginae and nectarivorous Pteropodids; these papillae likely confer an advantage when feeding on nectar. P. discolor does not show skull morphological features characteristic of nectarivorous bats, such as a long and narrow snout. We pose that the consumption of a variety of food, such as hard insects and fruits, and the large size of P. discolor relative to specialized nectarivores may create trade‐offs against morphological specialization of the skull towards nectarivory. In contrast, a long and mobile tongue with hair‐like papillae may be an evolutionary solution for nectar extraction that does not have a major impact on this species' ability to feed on other resources.

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Viscous entrainment on hairy surfaces

Cited by 21 publications

References 15 publications

A Random Laser Based on Hybrid Fluorescent Dye and Diamond Nanoneedles

A Random Laser Based on Hybrid Fluorescent Dye and Diamond Nanoneedles

Fibrous Flagellar Hairs of Chlamydomonas reinhardtii Do Not Enhance Swimming

Morphological specialization to nectarivory in Phyllostomus discolor (Wagner, 1843) (Chiroptera: Phyllostomidae)

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