Magnetically assisted and accelerated self-assembly of strawberry-like nano/microparticles

Article Abstract:

A novel method to reliably pattern strawberry-like microspheres that employs magnetically directed and accelerated self-assembly of nano/microparticles in aqueous solution, without the use of a template is introduced. The results reveal that 100-1000 nm paramagnetic 'decorating particles' rapidly self-assemble onto the surface of fluorescent 4-5 mum spherical magnetized 'core particles,' to produce strawberry-like particles with stable and precisely arranged microstructures.

Electric properties, Optical properties, Chemical detectors, Magnetization, Microspheres

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Metal-capped brownian and magnetically modulated optical nanoprobes (MOONs): micromechanics in chemical and biological microenvironments

Article Abstract:

Modulated optical nanoprobes (MOONs) are microscopic (spherical and aspherical) fluorescent particles designed to emit varying intensities of light in a manner that depends on particle orientation. The methods by which tracking angular fluctuations allow sensitive measurements of torques acting on Brownian MOONs are studied.

Fluorescence, Optics, Light emission, Optical research

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Sudden breakdown in linear response of a rotationally driven magnetic microparticle and application to physical and chemical microsensing

Article Abstract:

Sensing magnetic microparticles were used to probe both the local pH and the viscosity-dependent nonlinear rotational behavior of the particles. The transition from simple rotation to wobbling is described both theoretically and experimentally.

Viscosity, Hydrogen-ion concentration, pH

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