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- Kerstin N Nordstrom, Emilie Verneuil, Wouter G. Ellenbroek, Tom C. Lubensky, Jerry P. Gollub, Douglas J. Durian
- Physical review. E, Statistical, nonlinear, and…
- 2010

An exact method is developed for computing the height of an elastic medium subjected to centrifugal compression, for arbitrary constitutive relation between stress and strain. Example solutions are obtained for power-law media and for cases where the stress diverges at a critical strain--for example as required by packings composed of deformable but… (More)

- David A. Christian, Aiwei Tian, +6 authors Dennis E Discher
- Nature materials
- 2009

Selective binding of multivalent ligands within a mixture of polyvalent amphiphiles provides, in principle, a simple mechanism for driving domain formation in self-assemblies. Divalent cations are shown here to crossbridge polyanionic amphiphiles, which thereby demix from neutral amphiphiles and form spots or rafts within vesicles as well as stripes within… (More)

- Wouter G. Ellenbroek, Yu-Hsiu Wang, David A. Christian, Dennis E Discher, Paul A. Janmey, Andrea J. Liu
- Biophysical journal
- 2011

Polyphosphoinositides are among the most highly charged molecules in the cell membrane, and the most common polyphosphoinositide, phosphatidylinositol-4,5-bisphosphate (PIP(2)), is involved in many mechanical and biochemical processes in the cell membrane. Divalent cations such as calcium can cause clustering of the polyanionic PIP(2), but the origin and… (More)

- Ke Chen, Wouter G. Ellenbroek, +8 authors Arjun G. Yodh
- Physical review letters
- 2010

We conduct experiments on two-dimensional packings of colloidal thermosensitive hydrogel particles whose packing fraction can be tuned above the jamming transition by varying the temperature. By measuring displacement correlations between particles, we extract the vibrational properties of a corresponding "shadow" system with the same configuration and… (More)

- Ellák Somfai, Martin van Hecke, Wouter G. Ellenbroek, Kostya Shundyak, Wim van Saarloos
- Physical review. E, Statistical, nonlinear, and…
- 2007

We probe the nature of the jamming transition of frictional granular media by studying their vibrational properties as a function of the applied pressure p and friction coefficient mu. The density of vibrational states exhibits a crossover from a plateau at frequencies omega > or similar to omega*(p,mu) to a linear growth for omega < or similar to… (More)

- Ke Chen, Matthew L Manning, +4 authors Arjun G. Yodh
- Physical review letters
- 2011

We investigate correlations between low-frequency vibrational modes and rearrangements in two-dimensional colloidal glasses composed of thermosensitive microgel particles, which readily permit variation of the sample packing fraction. At each packing fraction, the particle displacement covariance matrix is measured and used to extract the vibrational… (More)

- Wouter G. Ellenbroek, Ellák Somfai, Martin van Hecke, Wim van Saarloos
- Physical review letters
- 2006

We study the origin of the scaling behavior in frictionless granular media above the jamming transition by analyzing their linear response. The response to local forcing is non-self-averaging and fluctuates over a length scale that diverges at the jamming transition. The response to global forcing becomes increasingly nonaffine near the jamming transition.… (More)

- Wouter G. Ellenbroek, Martin van Hecke, Wim van Saarloos
- Physical review. E, Statistical, nonlinear, and…
- 2009

By calculating the linear response of packings of soft frictionless disks to quasistatic external perturbations, we investigate the critical scaling behavior of their elastic properties and nonaffine deformations as a function of the distance to jamming. Averaged over an ensemble of similar packings, these systems are well described by elasticity, while in… (More)

- Peter J. Yunker, Ke Chen, Zexin Zhang, Wouter G. Ellenbroek, Andrea J. Liu, Arjun G. Yodh
- Physical review. E, Statistical, nonlinear, and…
- 2011

The effects of particle shape on the vibrational properties of colloidal glasses are studied experimentally. "Ellipsoidal glasses" are created by stretching polystyrene spheres to different aspect ratios and then suspending the resulting ellipsoidal particles in water at a high packing fraction. By measuring displacement correlations between particles, we… (More)

- Wouter G. Ellenbroek, Zorana Zeravcic, W. van Saarloos, Martin van Hecke
- 2009

We compare the elastic response of spring networks whose contact geometry is derived from real packings of frictionless discs, to networks obtained by randomly cutting bonds in a highly connected network derived from a well-compressed packing. We find that the shear response of packing-derived networks, and both the shear and compression response of… (More)