Tim Still
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View article: Nucleation kinetics and virtual melting in shear-induced structural transitions
Nucleation kinetics and virtual melting in shear-induced structural transitions Open
Large shear deformations can induce structural changes within crystals, yet the microscopic kinetics underlying these transformations are difficult for experimental observation and theoretical understanding. Here, we drive shear-induced st…
View article: In situ observation of coalescence of nuclei in colloidal crystal-crystal transitions
In situ observation of coalescence of nuclei in colloidal crystal-crystal transitions Open
Coalescence of nuclei in phase transitions significantly influences the transition rate and the properties of product materials, but these processes occur rapidly and are difficult to observe at the microscopic scale. Here, we directly ima…
View article: In situ observation of coalescence of nuclei in colloidal crystal-crystal transitions
In situ observation of coalescence of nuclei in colloidal crystal-crystal transitions Open
Coalescence of nuclei in phase transitions significantly influences the transition rate and the properties of product materials, but these processes occur rapidly and are difficult to observe at the microscopic scale. Here, we directly ima…
View article: In situ observation of coalescence of nuclei in colloidal crystal-crystal transitions
In situ observation of coalescence of nuclei in colloidal crystal-crystal transitions Open
Data record how two nuclei coalence in crystal-crystal transitions in colloidal crystals.
View article: Nucleation kinetics and virtual melting in shear-induced crystal–crystal transitions
Nucleation kinetics and virtual melting in shear-induced crystal–crystal transitions Open
Crystal–crystal (c–c) transitions are often induced by large shear deformation, but the microscopic kinetics associated with c–c transitions are difficult to experimentally observe and are poorly understood theoretically. Here, we drive sh…
View article: Origin of the Acoustic Bandgaps in Hypersonic Colloidal Phononics: The Role of the Elastic Impedance
Origin of the Acoustic Bandgaps in Hypersonic Colloidal Phononics: The Role of the Elastic Impedance Open
How phonons propagate in nanostructures determines the flow of elastic and thermal energy in dielectric materials. However, a reliable theoretical prediction of the phonon dispersion relation requires experimental verification both near to…
View article: Shear-assisted grain coarsening in colloidal polycrystals
Shear-assisted grain coarsening in colloidal polycrystals Open
Significance Grain growth and grain-boundary motions during shear play key roles in polycrystal annealing. Notably, complex interactions between neighboring grains give rise to nontrivial grain-boundary kinetics that are not well understoo…
View article: Heterogeneous Activation, Local Structure, and Softness in Supercooled Colloidal Liquids
Heterogeneous Activation, Local Structure, and Softness in Supercooled Colloidal Liquids Open
We experimentally characterize heterogeneous nonexponential relaxation in bidisperse supercooled colloidal liquids utilizing a recent concept called "softness" [Phys. Rev. Lett. 114, 108001 (2015)PRLTAO0031-900710.1103/PhysRevLett.114.1080…
View article: Different routes into the glass state for soft thermo-sensitive colloids
Different routes into the glass state for soft thermo-sensitive colloids Open
Different non-equilibrium routes lead to comparable dynamically arrested states of thermo-sensitive PNIPAM colloids.
View article: Structure-property relationships from universal signatures of plasticity in disordered solids
Structure-property relationships from universal signatures of plasticity in disordered solids Open
Behavioral universality across size scales Glassy materials are characterized by a lack of long-range order, whether at the atomic level or at much larger length scales. But to what extent is their commonality in the behavior retained at t…
View article: Structure-property relationships from universal signatures of plasticity in disordered solids
Structure-property relationships from universal signatures of plasticity in disordered solids Open
When deformed beyond their elastic limits, crystalline solids flow plastically via particle rearrangements localized around structural defects. Disordered solids also flow, but without obvious structural defects. We link structure to plast…
View article: Deposition and drying dynamics of liquid crystal droplets
Deposition and drying dynamics of liquid crystal droplets Open
Drop drying and deposition phenomena reveal a rich interplay of fundamental science and engineering, give rise to fascinating everyday effects (coffee rings), and influence technologies ranging from printing to genotyping. Here we investig…
View article: Tunable depletion potentials driven by shape variation of surfactant micelles
Tunable depletion potentials driven by shape variation of surfactant micelles Open
Depletion interaction potentials between micron-sized colloidal particles are induced by nanometer-scale surfactant micelles composed of hexaethylene glycol monododecyl ether (C_{12}E_{6}), and they are measured by video microscopy. The st…
View article: Hydrogels: Temperature‐Sensitive Hydrogel‐Particle Films from Evaporating Drops (Adv. Mater. Interfaces 16/2015)
Hydrogels: Temperature‐Sensitive Hydrogel‐Particle Films from Evaporating Drops (Adv. Mater. Interfaces 16/2015) Open
Most drying colloidal drops produce a useless stain. In article 1500371, T. Still and co-workers show how a simple one-step drying process can be utilized to prepare colloidal hydrogel films that consist of cross-linked micron-size poly(N-…
View article: Strain fluctuations and elastic moduli in disordered solids
Strain fluctuations and elastic moduli in disordered solids Open
Recently there has been a surge in interest in using video-microscopy techniques to infer the local mechanical properties of disordered solids. One common approach is to minimize the difference between particle vibrational displacements in…
View article: Chiral structures and defects of lyotropic chromonic liquid crystals induced by saddle-splay elasticity
Chiral structures and defects of lyotropic chromonic liquid crystals induced by saddle-splay elasticity Open
An experimental and theoretical study of lyotropic chromonic liquid crystals (LCLCs) confined in cylinders with degenerate planar boundary conditions elucidates LCLC director configurations. When the Frank saddle-splay modulus is more than…
View article: Diagnosing hyperuniformity in two-dimensional, disordered, jammed packings of soft spheres
Diagnosing hyperuniformity in two-dimensional, disordered, jammed packings of soft spheres Open
Hyperuniformity characterizes a state of matter for which (scaled) density fluctuations diminish towards zero at the largest length scales. However, the task of determining whether or not an image of an experimental system is hyperuniform …