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Showing 1 to 12 of 49 entries
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Colloidal particles driven across periodic optical-potential-energy landscapes.

Physical review. E

Juniper MP, Straube AV, Aarts DG, Dullens RP.
PMID: 26871123
Phys Rev E. 2016 Jan;93(1):012608. doi: 10.1103/PhysRevE.93.012608. Epub 2016 Jan 19.

We study the motion of colloidal particles driven by a constant force over a periodic optical potential energy landscape. First, the average particle velocity is found as a function of the driving velocity and the wavelength of the optical...

Quality indicators for colonoscopy: Current insights and caveats.

World journal of gastrointestinal endoscopy

Pullens HJ, Siersema PD.
PMID: 25512766
World J Gastrointest Endosc. 2014 Dec 16;6(12):571-83. doi: 10.4253/wjge.v6.i12.571.

Colonoscopy is the diagnostic modality of choice for investigation of symptoms suspected to be related to the colon and for the detection of polyps and colorectal cancer (CRC). Colonoscopy with removal of detected polyps has been shown to reduce...

Superconfinement tailors fluid flow at microscales.

Nature communications

Setu SA, Dullens RP, Hernández-Machado A, Pagonabarraga I, Aarts DG, Ledesma-Aguilar R.
PMID: 26073752
Nat Commun. 2015 Jun 15;6:7297. doi: 10.1038/ncomms8297.

Understanding fluid dynamics under extreme confinement, where device and intrinsic fluid length scales become comparable, is essential to successfully develop the coming generations of fluidic devices. Here we report measurements of advancing fluid fronts in such a regime, which...

Segregated Ice Growth in a Suspension of Colloidal Particles.

The journal of physical chemistry. B

Schollick JM, Style RW, Curran A, Wettlaufer JS, Dufresne ER, Warren PB, Velikov KP, Dullens RP, Aarts DG.
PMID: 27046043
J Phys Chem B. 2016 Apr 28;120(16):3941-9. doi: 10.1021/acs.jpcb.6b00742. Epub 2016 Apr 15.

We study the freezing of a dispersion of colloidal silica particles in water, focusing on the formation of segregated ice in the form of ice lenses. Local temperature measurements in combination with video microscopy give insight into the rich...

On the Gaussian approximation in colloidal hard sphere fluids.

Soft matter

Thorneywork AL, Aarts DG, Horbach J, Dullens RP.
PMID: 27064930
Soft Matter. 2016 May 14;12(18):4129-34. doi: 10.1039/c5sm03049h. Epub 2016 Apr 11.

We study the behaviour of the self-intermediate scattering function and self-van Hove correlation function for quasi-two-dimensional colloidal hard sphere fluids at a range of area fractions. We compute these functions first directly from the particle coordinates and secondly from...

Communication: radial distribution functions in a two-dimensional binary colloidal hard sphere system.

The Journal of chemical physics

Thorneywork AL, Roth R, Aarts DG, Dullens RP.
PMID: 24784245
J Chem Phys. 2014 Apr 28;140(16):161106. doi: 10.1063/1.4872365.

Two-dimensional hard disks are a fundamentally important many-body model system in classical statistical mechanics. Despite their significance, a comprehensive experimental data set for two-dimensional single component and binary hard disks is lacking. Here, we present a direct comparison between...

Shape-induced frustration of hexagonal order in polyhedral colloids.

Physical review letters

Dullens RP, Mourad MC, Aarts DG, Hoogenboom JP, Kegel WK.
PMID: 16486657
Phys Rev Lett. 2006 Jan 20;96(2):028304. doi: 10.1103/PhysRevLett.96.028304. Epub 2006 Jan 18.

The effect of a nonspherical particle shape and shape polydispersity on the structure of densely packed hard colloidal particles was studied in real space by confocal microscopy. We show that the first layer at the wall of concentrated size-monodisperse...

Grain-boundary fluctuations in two-dimensional colloidal crystals.

Physical review letters

Skinner TO, Aarts DG, Dullens RP.
PMID: 21231020
Phys Rev Lett. 2010 Oct 15;105(16):168301. doi: 10.1103/PhysRevLett.105.168301. Epub 2010 Oct 13.

We study grain-boundary fluctuations in two-dimensional colloidal crystals in real space and time using video microscopy. The experimentally obtained static and dynamic correlation functions are very well described by expressions obtained using capillary wave theory. This directly leads to...

Mathematical analysis of the cellular immune reaction against tumour cells.

Immunology today

De Weger RA, Dullens HF, De Boer RJ, Den Otter W.
PMID: 25290993
Immunol Today. 1985 Nov;6(11):316-7. doi: 10.1016/0167-5699(85)90119-7.

No abstract available.

Fluid-fluid demixing of off-critical colloid-polymer systems confined between parallel plates.

Journal of physics. Condensed matter : an Institute of Physics journal

Jamie EA, Dullens RP, Aarts DG.
PMID: 22739489
J Phys Condens Matter. 2012 Jul 18;24(28):284120. doi: 10.1088/0953-8984/24/28/284120. Epub 2012 Jun 27.

We investigate the off-critical demixing of colloid-polymer systems confined between two parallel plates, where the surface potential is short ranged. We study the case where the minority phase completely wets the surfaces. We find that initially the sample separates...

Determining local geometrical features of grain boundaries from microscopy.

Journal of physics. Condensed matter : an Institute of Physics journal

Lavergne FA, Aarts DG, Dullens RP.
PMID: 25923833
J Phys Condens Matter. 2015 May 20;27(19):194117. doi: 10.1088/0953-8984/27/19/194117. Epub 2015 Apr 29.

Grain boundaries are solid-solid interfaces whose dynamics is driven by their local curvature. As they are fluctuating interfaces and have a width comparable to the lattice spacing of the surrounding grains, the determination of their local geometrical characteristics is...

Self-diffusion in two-dimensional binary colloidal hard-sphere fluids.

Physical review. E

Thorneywork AL, Aarts DG, Horbach J, Dullens RP.
PMID: 28208506
Phys Rev E. 2017 Jan;95(1):012614. doi: 10.1103/PhysRevE.95.012614. Epub 2017 Jan 31.

We present a systematic experimental study of the dynamic behavior of monodisperse and bidisperse two-dimensional colloidal hard-sphere fluids. We consider the diffusive behavior of the two types of particles for systems with a variety of compositions and total area...

Showing 1 to 12 of 49 entries