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Microscopic artificial swimmers
It is shown that a linear chain of colloidal magnetic particles linked by DNA and attached to a red blood cell can act as a flexible artificial flagellum, which induces a beating pattern that propels the structure, and that the external fields can be adjusted to control the velocity and the direction of motion.
Diagnosing hyperuniformity in two-dimensional, disordered, jammed packings of soft spheres.
Using video optical microscopy to study hyperuniformity phenomena in disordered two-dimensional jammed packings of soft spheres and a simple packing reconstruction algorithm that incorporates particle polydispersity to minimize the free volume, simulations show that hyper uniformity in finite-sized samples can be ascertained more accurately in direct space than in reciprocal space.
Ordered and disordered patterns in two-phase flows in microchannels.
It is shown that wetting properties crucially control the patterns in two-phase flows of immiscible fluids in microchannels, and a lower limit for the channel sizes capable of generating well structured objects is presented.
On the dynamics of magnetically driven elastic filaments
Following a novel realization of low-Reynolds-number swimming (Dreyfus et al., Nature, vol. 436, 2005, p. 862), in which self-assembled filaments of paramagnetic micron-sized beads are tethered to
Simple quantitative model for the reversible association of DNA coated colloids.
This work investigates the reversible association of micrometer-sized colloids coated with complementary single-stranded DNA "sticky ends" as a function of the temperature and the sticky end coverage and develops a simple general model in terms of the configurational entropy loss due to binding and confinement of the tethered DNA between neighboring particles.
Emergent Hyperuniformity in Periodically Driven Emulsions.
It is shown that, as opposed to equilibrium systems, the long-range nature of the hydrodynamic interactions are not required for the formation of hyperuniform patterns, thereby suggesting a robust relation between reversibility and hyper uniformity which should hold in a broad class of periodically driven materials.
Polygamous particles
The design rules for multiflavored particles are presented and it is shown that a single particle, DNA functionalized with many different “flavors,” can recognize and bind specifically to many different partners.
One-step green synthesis of gold and silver nanoparticles with ascorbic acid and their versatile surface post-functionalization
In this study, we present a rapid and efficient synthesis of metallic gold and silver nanoparticles using ascorbic acid (vitamin C), which acts both as reducing and stabilizing agent. The size of the
DNA patchy particles.
A simple and effective way to make DNA patchy particles that provide direction-selective and thermoreversible interactions, and hence can lead to unique assembly protocols and structures controlled by temperature.
Switchable self-protected attractions in DNA-functionalized colloids.
This work shows how loop and hairpin formation in the DNA coatings of micrometre-sized particles gives in situ control over the inter-particle binding strength and association kinetics, making self-protected colloids a novel material that greatly extends the utility of DNA-functionalized systems, enabling more versatile, multi-stage assembly approaches.