Publications de Branimir Lukic

Direct observation of the full transition from ballistic to diffusive Brownian motion in a liquid

At timescales once deemed immeasurably small by Einstein, the random movement of Brownian particles in a liquid is expected to be replaced by ballistic motion. So far, an experimental verification of this prediction has been out of reach due to a lack of i ...

2011

Anisotropic memory effects in confined colloidal diffusion

László Forró, Branimir Lukic, Sylvia Jeney

The motion of an optically trapped sphere constrained by the vicinity of a wall is investigated at times where hydrodynamic memory is significant. First, we quantify, in bulk, the influence of confinement arising from the trapping potential on the sphere's ...

2008

Brownian motion studied with an optical trap

Branimir Lukic

This thesis describes measurements of Brownian motion of a colloidal particle using optical trapping. Two aspects are investigated: (i) influence of inertial effects on Brownian motion, and (ii) effect of the optical trap on Brownian motion. The first part ...

EPFL2008

Diameter-Dependent Elastic Modulus Supports the Metastable-Catalyst Growth of Carbon Nanotubes

László Forró, Andrzej Kulik, Jin Won Seo, Branimir Lukic, Arnaud Magrez, Kyumin Lee

We measured the elastic modulus of individual multiwalled carbon nanotubes (MWCNTs) grown by catalytic chemical vapor deposition (CVD) over a broad diameter range (10-25 nm). Alternating current (ac) dielectrophoresis was used for efficient tube deposition ...

American Chemical Society (ACS)2007

Motion of a colloidal particle in an optical trap

László Forró, Andrzej Kulik, Branimir Lukic, Sylvia Jeney

Thermal position fluctuations of a colloidal particle in an optical trap are measured with microsecond resolution using back-focal-plane interferometry. The mean-square displacement MSD(t) and power spectral density are in excellent agreement with the theo ...

2007

Elastic modulus of multi-walled carbon nanotubes produced by catalytic chemical vapour deposition

László Forró, Andrzej Kulik, Andras Kis, Jin Won Seo, Branimir Lukic, Kyumin Lee, Klara Hernadi

Springer Verlag2005

Catalytically grown carbon nanotubes of small diameter have a high Young's modulus

László Forró, Andrzej Kulik, Andras Kis, Jin Won Seo, Branimir Lukic, Sylvia Jeney

American Chemical Society2005

Direct observation of nondiffusive motion of a Brownian particle

László Forró, Andrzej Kulik, Branimir Lukic, Sylvia Jeney

The thermal position fluctuations of a single micron-sized sphere immersed in a fluid were recorded by optical trapping interferometry with nanometer spatial and microsecond temporal resolution. We find, in accord with the theory of Brownian motion includi ...

2005