Magnetische Levitation in Chemie, Materialwissenschaft und Biochemie

Ge, Shencheng; Nemiroski, Alex; Mirica, Katherine A.; Mace, Charles R.; Hennek, Jonathan W.; Kumar, Ashok Ashwin; Whitesides, George M.

doi:10.1002/ange.201903391

Cited by 3 publications

(1 citation statement)

References 188 publications

(414 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An active field, known as ”MagLev”, embraces the merit of magnetic assemblies in which like poles face each other. The resulting tailored distribution allows density-based particle levitation, manipulation, and separation − to be achieved. With respect to Earnshaw’s theorem, the magnetic assembly must provide a balance of Kelvin force and buoyancy that acts stably on the target substance.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Separation of Rare-Earth Ions: Property Database and Kelvin Force Distribution

et al. 2022

View full text Add to dashboard Cite

This work bridges two gaps in the magnetic separation of rare-earth ions. (1) A material property database is provided for the solutal expansion coefficient and the magnetic susceptibility of 11 out of 17 trivalent rare-earths. (2) A novel protocol is developed to enhance and resolve the magnetic term of the Kelvin force. For that purpose, an assembly of partition magnets is created where the individual magnets function in the first quadrant of their magnetic hysteresis loop. The mutual reinforcement is quantified in a particle magnetic levitation system. Thus, compared to exisiting magnetic assemblies, an enhancement in ∂B/(2μ0 ∂z) as high as 2 orders of magnitude is realized that covers 90% of the normalized spatial scale and requires 1 order of magnitude less magnet mass. Modeling the energy density field makes it possible to quantify the equilibrium position of the particle cloud at rest, which is attained via magnetophoresis of the particles regardless of their initial position. This enables the magnetic trapping and manipulation of particles with small hydrodynamic diameters. Optically tracking the transient magnetophoresis enables a high-fidelity, sub-mm resolution of ∂B 2/(2μ0 ∂z) which is further used to quantify the magnetic susceptibility of Ho(III), Tb(III), Er(III), and Gd(III).

show abstract

Section: Introductionmentioning

confidence: 99%

Magnetic Separation of Rare-Earth Ions: Property Database and Kelvin Force Distribution

et al. 2022

View full text Add to dashboard Cite

show abstract

Ultrasmall Nanocapsules Obtained by Controlling Ostwald Ripening

et al. 2021

View full text Add to dashboard Cite

We describe here a method to synthesize ultrasmall nanocapsules with a diameter of 6 nm, exhibiting a well‐defined core–shell morphology. Remarkably, the nanocapules are synthesized in a miniemulsion process without the need of large amounts of surfactant as commonly used in the microemulsion process. Ultrasmall nanocapsules with an oil core and a silica shell are formed by the concurrent processes of a sol–gel reaction and Ostwald ripening. Using solvents with different water solubilities and alkoxysilanes with different reactivities, we demonstrate that sizes of obtained nanocapsules depend on the ripening rate and alkoxysilane conversion rate. The method can be also used for encapsulating natural oils such as peppermint oil and limonene. This work shows that the Ostwald ripening phenomenon can be employed beneficially for the preparation of very small colloids.

show abstract

Ultrasmall Nanocapsules Obtained by Controlling Ostwald Ripening

et al. 2021

View full text Add to dashboard Cite

We describe here am ethod to synthesize ultrasmall nanocapsules with ad iameter of 6nm, exhibiting aw elldefined core-shell morphology.Remarkably,the nanocapules are synthesized in aminiemulsion process without the need of large amounts of surfactant as commonly used in the microemulsion process.U ltrasmall nanocapsules with an oil core and as ilica shell are formed by the concurrent processes of as ol-gel reaction and Ostwald ripening. Using solvents with different water solubilities and alkoxysilanes with different reactivities,wedemonstrate that sizes of obtained nanocapsules depend on the ripening rate and alkoxysilane conversion rate. The method can be also used for encapsulating natural oils such as peppermint oil and limonene.This work shows that the Ostwald ripening phenomenon can be employed beneficially for the preparation of very small colloids.

show abstract

Magnetische Levitation in Chemie, Materialwissenschaft und Biochemie

Cited by 3 publications

References 188 publications

Magnetic Separation of Rare-Earth Ions: Property Database and Kelvin Force Distribution

Magnetic Separation of Rare-Earth Ions: Property Database and Kelvin Force Distribution

Ultrasmall Nanocapsules Obtained by Controlling Ostwald Ripening

Ultrasmall Nanocapsules Obtained by Controlling Ostwald Ripening

Contact Info

Product

Resources

About