Thermal fluctuations of the shapes of droplets in dense and compressed emulsions

Hu, Gang; Krall, A. H.; Weitz, David A.

doi:10.1103/physreve.52.6289

Cited by 54 publications

(36 citation statements)

References 24 publications

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“…In other words, for the multiplication rule (16) to hold the optical thickness of e.g. the first layer should be much greater than that of the second one, while g (1) 1 (L 2 , τ ) ≃ 1 for the latter.…”

Section: Multiplication Rulementioning

confidence: 99%

“…colloidal suspensions [1][2][3][4][5][6]10], particle gels and ceramic green bodies [11][12][13][14][15], emulsions [16][17][18], foams [19][20][21][22][23], granular [24,25], and biological [26][27][28] media. It has been demonstrated that DWS can be used to image macroscopic static and dynamic heterogeneities in turbid media [29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

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Diffusing-wave spectroscopy of nonergodic media

et al. 2001

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We introduce an elegant method which allows the application of diffusing-wave spectroscopy (DWS) to nonergodic, solidlike samples. The method is based on the idea that light transmitted through a sandwich of two turbid cells can be considered ergodic even though only the second cell is ergodic. If absorption and/or leakage of light take place at the interface between the cells, we establish a so-called "multiplication rule", which relates the intensity autocorrelation function of light transmitted through the double-cell sandwich to the autocorrelation functions of individual cells by a simple multiplication. To test the proposed method, we perform a series of DWS experiments using colloidal gels as model nonergodic media. Our experimental data are consistent with the theoretical predictions, allowing quantitative characterization of nonergodic media and demonstrating the validity of the proposed technique.

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Section: Multiplication Rulementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diffusing-wave spectroscopy of nonergodic media

et al. 2001

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“…2. Given the large size of the droplets we predominantly probe selfmotion and shape fluctuations [22,[28][29][30] while the contribution of collective motion to the dynamic multiple light scattering signal can be neglected. We can then express the measured and normalized intensity-intensity correlation function g 2 (t) as follows [28,30,31]:…”

Section: Methodsmentioning

confidence: 99%

“…curves tend toward zero for short times while for the liquid droplets we detect an upturn at short times. The former is a signature of droplet and fluid inertia [33] while the latter is characteristic for additional thermal fluctuations of the liquid droplet interface [22,29].…”

Section: Thermal Motion Probed By Dwsmentioning

confidence: 99%

Brownian dynamics of colloidal microspheres with tunable elastic properties from soft to hard

Yoon

Cardinaux

Lapointe

et al. 2018

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…The single-quantum optomechanical coupling can be found from the optical WGM detuning produced by the surface We note that in order to obtain this result, care needs to be taken to preserve the volume of the drop by adjusting the radius (i.e., the l = 0 monopole contribution to δR) [43]. Focusing on the l = 2,m = 0 mode, we then equate the average potential energy 2σ X 2 0 to half of the zero-point energyhω vib /4.…”

Section: B Optomechanical Coupling To Surface Modesmentioning

confidence: 99%

Cavity optomechanics in a levitated helium drop

et al. 2017

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We describe a proposal for a type of optomechanical system based on a drop of liquid helium that is magnetically levitated in vacuum. In the proposed device, the drop would serve three roles: its optical whispering-gallery modes would provide the optical cavity, its surface vibrations would constitute the mechanical element, and evaporation of He atoms from its surface would provide continuous refrigeration. We analyze the feasibility of such a system in light of previous experimental demonstrations of its essential components: magnetic levitation of mm-scale and cm-scale drops of liquid He, evaporative cooling of He droplets in vacuum, and coupling to high-quality optical whispering-gallery modes in a wide range of liquids. We find that the combination of these features could result in a device that approaches the single-photon strong-coupling regime, due to the high optical quality factors attainable at low temperatures. Moreover, the system offers a unique opportunity to use optical techniques to study the motion of a superfluid that is freely levitating in vacuum (in the case of 4 He). Alternatively, for a normal fluid drop of 3 He, we propose to exploit the coupling between the drop's rotations and vibrations to perform quantum nondemolition measurements of angular momentum.

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Thermal fluctuations of the shapes of droplets in dense and compressed emulsions

Cited by 54 publications

References 24 publications

Diffusing-wave spectroscopy of nonergodic media

Diffusing-wave spectroscopy of nonergodic media

Brownian dynamics of colloidal microspheres with tunable elastic properties from soft to hard

Cavity optomechanics in a levitated helium drop

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