Apparatuses for manipulating a color displayed by an article of wear comprising iron oxide colloidal nanocrystals arranged within chains are described. The apparatus includes (a) a magnetic field source, wherein a strength of a magnetic field generated by the magnetic field source is tunable to control the color displayed by the article of wear, and (b) an energy source, wherein energy generated by the energy source is applied to at least some of the chains of nanocrystals to soften materials within the article of wear immediately surrounding the chains of nanocrystals to which the energy is applied.

Articles of wear comprises iron oxide colloidal nanocrystals arranged within chains are described. The chains of nanocrystals display a color that is determined by a strength of a magnetic field applied to the chains of nanocrystals, wherein the color is maintained when the magnetic field is removed.

The compositions and methods herein relate to stable dispersions of long chain carboxylic acid-stabilized magnetite nanoparticles dispersed in alcohol. These compositions are useful in advanced biomedical applications.

Articles of wear comprises iron oxide colloidal nanocrystals arranged within chains are described. The chains of nanocrystals display a color that is determined by a strength of a magnetic field applied to the chains of nanocrystals, wherein the color is maintained when the magnetic field is removed.

Apparatuses for manipulating a color displayed by an article of wear comprising iron oxide colloidal nanocrystals arranged within chains are described. The apparatus includes (a) a magnetic field source, wherein a strength of a magnetic field generated by the magnetic field source is tunable to control the color displayed by the article of wear, and (b) an energy source, wherein energy generated by the energy source is applied to at least some of the chains of nanocrystals to soften materials within the article of wear immediately surrounding the chains of nanocrystals to which the energy is applied.

Nanoelectromechanical (NEMS) devices having nanomagnets for an improved range of operating voltages and improved control of dimensions of a cantilever are described. For example, in an embodiment, a nanoelectromechanical (NEMS) device includes a substrate layer, a first magnetic layer disposed above the substrate layer, a first dielectric layer disposed above the first magnetic layer, a second dielectric disposed above the first dielectric layer, and a cantilever disposed above the second dielectric layer. The cantilever bends from a first position to a second position towards the substrate layer when a voltage is applied to the cantilever.

Articles of wear comprises iron oxide colloidal nanocrystals arranged within chains are described. The chains of nanocrystals display a color that is determined by a strength of a magnetic field applied to the chains of nanocrystals, wherein the color is maintained when the magnetic field is removed.

Apparatuses for manipulating a color displayed by an article of wear comprising iron oxide colloidal nanocrystals arranged within chains are described. The apparatus includes (a) a magnetic field source, wherein a strength of a magnetic field generated by the magnetic field source is tunable to control the color displayed by the article of wear, and (b) an energy source, wherein energy generated by the energy source is applied to at least some of the chains of nanocrystals to soften materials within the article of wear immediately surrounding the chains of nanocrystals to which the energy is applied.

Articles comprises iron oxide colloidal nanocrystals arranged within chains, wherein the chains of nanocrystals are embedded within a material used to form the article or a transfer medium used to transfer a color to the article are described. The material or transfer medium includes elastic properties that allow the nanocrystals to display a temporary color determined by the strength of an external force applied to the article, and the material or transfer medium includes memory properties that cause the displayed temporary color to dissipate when the external force is removed, wherein the dissipation of the displayed temporary color is sufficiently slow as to be visually observable by an average observer's unaided eye.

Nanoelectromechanical (NEMS) devices having nanomagnets for an improved range of operating voltages and improved control of dimensions of a cantilever are described. For example, in an embodiment, a nanoelectromechanical (NEMS) device includes a substrate layer, a first magnetic layer disposed above the substrate layer, a first dielectric layer disposed above the first magnetic layer, a second dielectric disposed above the first dielectric layer, and a cantilever disposed above the second dielectric layer. The cantilever bends from a first position to a second position towards the substrate layer when a voltage is applied to the cantilever.