Dr RICHARD HILL's Outputs (16)

High-temperature Brown-Zak oscillations in graphene/hBN moiré field effect transistor fabricated using molecular beam epitaxy (2024)
Journal Article
Makarovsky, O., Hill, R. J. A., Cheng, T. S., Summerfield, A., Taniguchi, T., Watanabe, K., Mellor, C. J., Patanè, A., Eaves, L., Novikov, S. V., & Beton, P. H. (2024). High-temperature Brown-Zak oscillations in graphene/hBN moiré field effect transistor fabricated using molecular beam epitaxy. Communications Materials, 5, Article 189. https://doi.org/10.1038/s43246-024-00633-x

High-temperature Brown-Zak oscillations in graphene/hBN moiré field effect transistor fabricated using molecular beam epitaxy Graphene placed on hexagonal boron nitride (hBN) has received significant interest due to its excellent electrical performan... Read More about High-temperature Brown-Zak oscillations in graphene/hBN moiré field effect transistor fabricated using molecular beam epitaxy.

Sonomaglev: Combining acoustic and diamagnetic levitation (2023)
Journal Article
Hunter-Brown, G., Sampara, N., Scase, M. M., & Hill, R. J. (2023). Sonomaglev: Combining acoustic and diamagnetic levitation. Applied Physics Letters, 122(1), Article 014103. https://doi.org/10.1063/5.0134297

Acoustic levitation and diamagnetic levitation are experimental methods that enable the contact-free study of both liquid droplets and solid particles. Here, we combine both the techniques into a single system that takes advantage of the strengths of... Read More about Sonomaglev: Combining acoustic and diamagnetic levitation.

Magnetically induced Rayleigh-Taylor instability under rotation: Comparison of experimental and theoretical results (2020)
Journal Article
Scase, M., Baldwin, K., & Hill, R. (2020). Magnetically induced Rayleigh-Taylor instability under rotation: Comparison of experimental and theoretical results. Physical Review E, 102(4), Article 043101. https://doi.org/10.1103/PhysRevE.102.043101

© 2020 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the a... Read More about Magnetically induced Rayleigh-Taylor instability under rotation: Comparison of experimental and theoretical results.

Analog cosmology with two-fluid systems in a strong gradient magnetic field (2019)
Journal Article
Fifer, Z., Torres, T., Erne, S., Avgoustidis, A., Hill, R. J. A., & Weinfurtner, S. (2019). Analog cosmology with two-fluid systems in a strong gradient magnetic field. Physical Review E, 99(3), Article 031101(R). https://doi.org/10.1103/physreve.99.031101

We propose an experiment combining fluid dynamics and strong magnetic field physics to simulate cosmological scenarios. Our proposed system consists of two immiscible, weakly magnetized fluids moved through a strong gradient magnetic field. The diama... Read More about Analog cosmology with two-fluid systems in a strong gradient magnetic field.

Magnetic Levitation Stabilized by Streaming Fluid Flows (2018)
Journal Article
Fairhurst, D., Swift, M., Hill, R., Atkinson, P., Baldwin, K., Baldwin, K., de Fouchier, J.-B., Atkinson, P., Hill, R., Swift, M., & Fairhurst, D. (2018). Magnetic Levitation Stabilized by Streaming Fluid Flows. Physical Review Letters, 121(6), 1-5. https://doi.org/10.1103/physrevlett.121.064502

We demonstrate that the ubiquitous laboratory magnetic stirrer provides a simple passive method of magnetic levitation, in which the so-called ‘flea’ levitates indefinitely. We study the onset of levitation and quantify the flea’s motion (a combinati... Read More about Magnetic Levitation Stabilized by Streaming Fluid Flows.

Centrifugally forced Rayleigh–Taylor instability (2018)
Journal Article
Scase, M. M., & Hill, R. J. (2018). Centrifugally forced Rayleigh–Taylor instability. Journal of Fluid Mechanics, 852, 543-577. https://doi.org/10.1017/jfm.2018.539

We consider the effect of high rotation rates on two liquid layers that initially form concentric cylinders, centred on the axis of rotation. The configuration may be thought of as a fluid-fluid centrifuge. There are two types of perturbation to the... Read More about Centrifugally forced Rayleigh–Taylor instability.

Shapes and fissility of highly charged and rapidly rotating levitated liquid drops (2017)
Journal Article
Liao, L., & Hill, R. J. (2017). Shapes and fissility of highly charged and rapidly rotating levitated liquid drops. Physical Review Letters, 119, Article 114501. https://doi.org/10.1103/PhysRevLett.119.114501

We use diamagnetic levitation to investigate the shapes and the stability of free electrically charged and spinning liquid drops of volume ∼1 ml. In addition to binary fission and Taylor cone-jet fission modes observed at low and high charge density,... Read More about Shapes and fissility of highly charged and rapidly rotating levitated liquid drops.

Magnetically Induced Rotating Rayleigh-Taylor Instability (2017)
Journal Article
Scase, M. M., Baldwin, K. A., & Hill, R. J. (2017). Magnetically Induced Rotating Rayleigh-Taylor Instability. Journal of Visualized Experiments, https://doi.org/10.3791/55088

Classical techniques for investigating the Rayleigh-Taylor instability include using compressed gasses, rocketry or linear electric motors to reverse the effective direction of gravity, and accelerate the lighter fluid toward the denser fluid. Other... Read More about Magnetically Induced Rotating Rayleigh-Taylor Instability.

Ice as a granular material (2016)
Presentation / Conference Contribution
Turnbull, B., Swift, M., & Hill, R. (2016, August). Ice as a granular material. Presented at 24th International Congress of Theoretical and Applied Mechanics

Ice is a unique material, fundamental to vital processes on earth, in the atmosphere [1] and as planets and comets form [2]. In this work, we introduce two experiments investigating ice as a granular material, to provide snippets of insight into thos... Read More about Ice as a granular material.

Propulsion of a two-sphere swimmer (2015)
Journal Article
Klotsa, D., Baldwin, K. A., Hill, R. J., Bowley, R., & Swift, M. R. (2015). Propulsion of a two-sphere swimmer. Physical Review Letters, 115(24), Article 248102. https://doi.org/10.1103/PhysRevLett.115.248102

We describe experiments and simulations demonstrating the propulsion of a neutrally-buoyant swimmer that consists of a pair of spheres attached by a spring, immersed in a vibrating fluid. The vibration of the fluid induces relative motion of the sphe... Read More about Propulsion of a two-sphere swimmer.

The inhibition of the Rayleigh-Taylor instability by rotation (2015)
Journal Article
Baldwin, K. A., Scase, M. M., & Hill, R. J. (2015). The inhibition of the Rayleigh-Taylor instability by rotation. Scientific Reports, 5(11706), https://doi.org/10.1038/srep11706

It is well-established that the Coriolis force that acts on fluid in a rotating system can act to stabilise otherwise unstable flows. Chandrasekhar considered theoretically the effect of the Coriolis force on the Rayleigh-Taylor instability, which oc... Read More about The inhibition of the Rayleigh-Taylor instability by rotation.

Artificial tektites: an experimental technique for capturing the shapes of spinning drops (2015)
Journal Article
Baldwin, K. A., Butler, S. L., & Hill, R. J. (in press). Artificial tektites: an experimental technique for capturing the shapes of spinning drops. Scientific Reports, 5, Article 7660. https://doi.org/10.1038/srep07660

Determining the shapes of a rotating liquid droplet bound by surface tension is an archetypal problem in the study of the equilibrium shapes of a spinning and charged droplet, a problem that unites models of the stability of the atomic nucleus with t... Read More about Artificial tektites: an experimental technique for capturing the shapes of spinning drops.

Tuneable paramagnetic susceptibility and exciton g-factor in Mn-doped PbS colloidal nanocrystals (2014)
Journal Article
Turyanska, L., Hill, R. J. A., Makarovsky, O., Moro, F., Knott, A. N., Larkin, O. J., Patanè, A., Meaney, A., Christianen, P. C. M., Fay, M. W., & Curry, R. J. (2014). Tuneable paramagnetic susceptibility and exciton g-factor in Mn-doped PbS colloidal nanocrystals. Nanoscale, 6(15), 8919-8925. https://doi.org/10.1039/c4nr02336f

We report on PbS colloidal nanocrystals that combine within one structure solubility in physiological solvents with near-infrared photoluminescence, and magnetic and optical properties tuneable by the controlled incorporation of magnetic impurities (... Read More about Tuneable paramagnetic susceptibility and exciton g-factor in Mn-doped PbS colloidal nanocrystals.

Mechanical vibrations of magnetically levitatedviscoelastic droplets (2014)
Journal Article
Temperton, R. H., Hill, R. J., & Sharp, J. S. (2014). Mechanical vibrations of magnetically levitatedviscoelastic droplets. Soft Matter, 10(29), 5375-5379. https://doi.org/10.1039/c4sm00982g

The mechanical vibrations of magnetically levitated droplets were investigated using a simple optical deflection technique. Droplets of water and a water-based solution of poly(acrylamide-co-acrylic acid) were levitated in the bore of a superconducti... Read More about Mechanical vibrations of magnetically levitatedviscoelastic droplets.

Meristematic cell proliferation and ribosome biogenesis are decoupled in diamagnetically levitated Arabidopsis seedlings (2013)
Journal Article
Manzano, A. I., Larkin, O. J., Dijkstra, C. E., Anthony, P., Davey, M. R., Eaves, L., Hill, R. J., Herranz, R., & Medina, F. J. (2013). Meristematic cell proliferation and ribosome biogenesis are decoupled in diamagnetically levitated Arabidopsis seedlings. BMC Plant Biology, 13, Article 124. https://doi.org/10.1186/1471-2229-13-124

Background: Cell growth and cell proliferation are intimately linked in the presence of Earth’s gravity, but are decoupled under the microgravity conditions present in orbiting spacecraft. New technologies to simulate microgravity conditions for long... Read More about Meristematic cell proliferation and ribosome biogenesis are decoupled in diamagnetically levitated Arabidopsis seedlings.

Suboptimal evolutionary novel environments promote singular altered gravity responses of transcriptome during Drosophila metamorphosis (2013)
Journal Article
Herranz, R., Larkin, O. J., Hill, R. J., Lopez-Vidriero, I., van Loon, J. J., & Medina, F. J. (2013). Suboptimal evolutionary novel environments promote singular altered gravity responses of transcriptome during Drosophila metamorphosis. BMC Evolutionary Biology, 13(June), Article 10. https://doi.org/10.1186/1471-2148-13-133

Background

Previous experiments have shown that the reduced gravity aboard the International Space Station (ISS) causes important alterations in Drosophila gene expression. These changes were shown to be intimately linked to environmental space-fl... Read More about Suboptimal evolutionary novel environments promote singular altered gravity responses of transcriptome during Drosophila metamorphosis.