Magneto-controlled illumination with opto-fluidics

Malynych, Serhiy; Tokarev, Alexander; Hudson, Stephen D.; Chumanov, George; Ballato, John; Kornev, Konstantin G.

doi:10.1016/j.jmmm.2010.01.003

Cited by 25 publications

(16 citation statements)

References 21 publications

(30 reference statements)

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“…Such applications call for the development of new devices providing controlled manipulation of the objects in question. [4][5][6][7][8] Depending on the method of field generation, these devices can be split into two groups. [9][10][11] One group employs permanent magnets fixed on a movable stage/holder which can be shaken or spun to produce an ac field.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional magnetic rotator for micro and nanorheological studies

Tokarev

Aprelev

Zakharov

et al. 2012

Review of Scientific Instruments

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We report on the development of a multifunctional magnetic rotator that has been built and used during the last five years by two groups from Clemson and Drexel Universities studying the rheological properties of microdroplets. This magnetic rotator allows one to generate rotating magnetic fields in a broad frequency band, from hertz to tens kilohertz. We illustrate its flexibility and robustness by conducting the rheological studies of simple and polymeric fluids at the nano and microscale. First we reproduce a temperature-dependent viscosity of a synthetic oil used as a viscosity standard. Magnetic rotational spectroscopy with suspended nickel nanorods was used in these studies. As a second example, we converted the magnetic rotator into a pump with precise controlled flow modulation. Using multiwalled carbon nanotubes, we were able to estimate the shear modulus of sickle hemoglobin polymer. We believe that this multifunctional magnetic system will be useful not only for micro and nanorheological studies, but it will find much broader applications requiring remote controlled manipulation of micro and nanoobjects.

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Section: Introductionmentioning

confidence: 99%

Multifunctional magnetic rotator for micro and nanorheological studies

Tokarev

Aprelev

Zakharov

et al. 2012

Review of Scientific Instruments

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“…The ribbon shaped beam was formed by the diffraction of light incident on the particles in the fiber core. 4 In a separate work, the brightness and intensity of light was controlled with the aid of ferrofluids consisting of paramagnetic particles that were manipulated using magnetic fields on a magnetic film in a device known as an "optomagnetic dimmer." 129 Other implementations of optical beam lensing or manipulation based on ferrofluids include the use of nickel nanorods produced by electroplating chemistry, which was shown to alter the shape of the laser beam passing through the suspension by varying the applied magnetic field.…”

Section: Particles As Lensesmentioning

confidence: 99%

“…Optofluidics refers to the field of research involving the integration of microfluidics and optics in the same platform, where fluid and light are driven to interact. 1 This integration has led to the realization of a wide range of applications such as optical sources, 2 lenses, 3 beam manipulators, 4 particle transport, 5 and sensing 6 in liquid media. Optofluidics is also used to describe a class of optical systems that are synthesized with fluids.…”

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confidence: 99%

Optofluidics incorporating actively controlled micro- and nano-particles

et al. 2012

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The advent of optofluidic systems incorporating suspended particles has resulted in the emergence of novel applications. Such systems operate based on the fact that suspended particles can be manipulated using well-appointed active forces, and their motions, locations and local concentrations can be controlled. These forces can be exerted on both individual and clusters of particles. Having the capability to manipulate suspended particles gives users the ability for tuning the physical and, to some extent, the chemical properties of the suspension media, which addresses the needs of various advanced optofluidic systems. Additionally, the incorporation of particles results in the realization of novel optofluidic solutions used for creating optical components and sensing platforms. In this review, we present different types of active forces that are used for particle manipulations and the resulting optofluidic systems incorporating them. These systems include optical components, optofluidic detection and analysis platforms, plasmonics and Raman systems, thermal and energy related systems, and platforms specifically incorporating biological particles. We conclude the review with a discussion of future perspectives, which are expected to further advance this rapidly growing field.

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“…10 For instance, magnetization of ferrofluid increases with the growth of chains, 2,11-14 viscosity abruptly increases, 1,2,15 thermal conductivity is enhanced if the field direction is parallel to temperature gradient, [16][17][18][19][20] and optical properties become strongly anisotropic. 1,[21][22][23] There are several examples of successful and prospective applications of self-assembled or field-assisted magnetic nanoparticles from technical applications to medical ones: in data storage, electronic devices, sensors, rotating shaft seals, hydrostatic and hydrodynamic bearings, magnetoacoustic transducers, vibration isolation and inertia damping systems, thermal systems, medical diagnostics, therapy and drug delivery, biophysical studies, and magnetic biosensing. [24][25][26][27][28][29][30][31] In order to engineer field-induced structures 25,32,33 in ferrofluids, it is necessary to understand the interactions between the magnetic particles and the parameters by which the structure formation can be controlled.…”

Section: Introductionmentioning

confidence: 99%

Direct observations of field-induced assemblies in magnetite ferrofluids

Mousavi

Khapli

Kumar

2015

Journal of Applied Physics

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Evolution of microstructures in magnetite-based ferrofluids with weak dipolar moments (particle size 10 nm) is studied with an emphasis on examining the effects of particle concentration (/) and magnetic field strength (H) on the structures. Nanoparticles are dispersed in water at three different concentrations, / ¼ 0.15%, 0.48%, and 0.59% (w/v) [g/ml%] and exposed to uniform magnetic fields in the range of H ¼ 0.05-0.42 T. Cryogenic transmission electron microscopy is employed to provide in-situ observations of the field-induced assemblies in such systems. As the magnetic field increases, the Brownian colloids are observed to form randomly distributed chains aligned in the field direction, followed by head-to-tail chain aggregation and then lateral aggregation of chains termed as zippering. By increasing the field in low concentration samples, the number of chains increases, though their length does not change dramatically. Increasing concentration increases the length of the linear particle assemblies in the presence of a fixed external magnetic field. Thickening of the chains due to zippering is observed at relatively high fields. Through a systematic variation of concentration and magnetic field strength, this study shows that both magnetic field strength and change in concentration can strongly influence formation of microstructures even in weak dipolar systems. Additionally, the results of two commonly used support films on electron microscopy grids, continuous carbon and holey carbon films, are compared. Holey carbon film allows us to create local regions of high concentrations that further assist the development of field-induced assemblies. The experimental observations provide a validation of the zippering effect and can be utilized in the development of models for thermophysical properties such as thermal conductivity. V C 2015 AIP Publishing LLC.

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Magneto-controlled illumination with opto-fluidics

Cited by 25 publications

References 21 publications

Multifunctional magnetic rotator for micro and nanorheological studies

Multifunctional magnetic rotator for micro and nanorheological studies

Optofluidics incorporating actively controlled micro- and nano-particles

Direct observations of field-induced assemblies in magnetite ferrofluids

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