Copper inks are provided that include a plurality of core-shell nanostructures, with each nanostructure including a copper core and a barrier metal shell, a diameter of less than about 500 nm, and a distinct boundary between the copper core and the barrier metal shell. Methods of forming a copper ink are further provided and include an initial step of synthesizing an amount of copper nanoparticles in an aqueous solution. An amount of a barrier metal is then added to the copper nanoparticles to form a dispersion of the barrier metal and the copper nanoparticles, and a reducing agent is subsequently added to the dispersion to produce a copper ink comprising core-shell nanostructures having a copper core and a barrier metal shell. Copper films are then formed by applying that copper ink to a substrate and sintering the copper ink.

The invention relates to methods for producing coloured materials with the use of metal nanoparticles of gold, copper or silver, to said coloured materials, and to the uses of same in various applications.

The present invention describes a procedure for obtaining microbiocapsules of one or more pyrethrins as active substance, and is framed in the field of biopesticide production technique. Natural pyrethrin is a broad spectrum insecticide extracted from the flowers of the plant of the genus Chrysasnthemun and is easily decomposed by air and light. The present invention increases the stability of pyrethrins, being effective for a longer time than other solutions of the state of the art. The method and procedure comprises the following steps; a first oil phase, a second phase of mixture emulsion and a third encapsulation phase. The result is the obtaining of pyrethrin microbiocapsules with a size between 0.5 to 5 microns, with greater stability. The process does not reduce the insecticidal capacity of pyrethrins.

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There are provided a paste-like composition for pressure measurement, including a microcapsule that encompasses an electron-donating dye precursor and an electron-accepting compound that causes the electron-donating dye precursor to develop a color, and a pressure measurement method using the paste-like composition for pressure measurement.

The present invention relates to a core-shell capsule comprising: a core comprising an oil, a solvent satisfying relational expression 1 below, and a water-insoluble polymer compound dissolved in the solvent; and a water-insoluble polymer shell enclosing the core.
0.01≤C.sub.A/C.sub.B≤100  [Relational expression 1]
(in relational expression 1, C.sub.A/C.sub.B is the distribution coefficient of solvent, and when the solvent is dissolved in oil and water to reach equilibrium, C.sub.A is the concentration of the solvent dissolved in the oil and C.sub.B is the concentration of the solvent dissolved in water).

The present invention relates to a core-shell capsule comprising: a core comprising an oil, a solvent satisfying relational expression 1 below, and a water-insoluble polymer compound dissolved in the solvent; and a water-insoluble polymer shell enclosing the core.
0.01≤C.sub.A/C.sub.B≤100  [Relational expression 1]
(in relational expression 1, C.sub.A/C.sub.B is the distribution coefficient of solvent, and when the solvent is dissolved in oil and water to reach equilibrium, C.sub.A is the concentration of the solvent dissolved in the oil and C.sub.B is the concentration of the solvent dissolved in water).

A material comprising an encapsulated component within a shell, a rupture initiator associated with the encapsulated component, and a polymeric matrix material, wherein the encapsulation is adapted to fail upon activation of the rupture initiator allowing the encapsulated component to be liberated to initiate a reaction or increase the reactivity of the material.

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.

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.

A method of encapsulating content with calcium alginate membrane to form a capsule. The method includes embedding sodium alginate into a traditional gelatin ribbon used in gelatin encapsulation, adding calcium to a fill material, encapsulating the fill material, and then denaturing the gelatin in the shell. An exemplary use of this method is to form throwable paintballs; however, other products could be formed using this process. A paintball formed by this process is also disclosed.