Abstract:
The present invention provides a process for production of a chain metal powder, which comprises the steps of reducing ferromagnetic metal ions contained in an aqueous solution through the action of a reducing agent while applying a magnetic field to the solution in a fixed direction thereby to deposit fine metal particles, and bonding a lot of the fine metal particles in a chain form so as to orient the fine metal particles in a direction of the applied magnetic field through magnetism of the fine metal particles, characterized in that the reduction deposition reaction is conducted in the presence of: (g) a reducing agent for generating a gas during the reduction of metal ions, or a combination of the reducing agent and a foaming agent capable of generating a gas; and (h) a foamable water soluble compound for generating a bubble layer on the surface of the aqueous solution by generation of the gas and the bubble layer formed on the surface of the aqueous solution is separated from the aqueous solution and then the chain metal powder contained in the bubble layer is collected.
Abstract:
Un proceso para la producción de un polvo metálico de cadena, que comprende las etapas de reducción de iones metálicos ferromagnéticos contenidos en una solución acuosa a través de la acción de un agente reductor mientras se aplica un campo magnético a la solución en una dirección fijada, para depositar de esta forma partículas metálicas finas, y uniendo muchas de las partículas metálicas finas en forma de cadena para orientar las partículas metálicas finas en una dirección del campo magnético aplicado a través del magnetismo de las partículas metálicas finas, caracterizado porque la reacción de deposición por reducción se realiza en presencia de un compuesto polimérico que comprende: (a) unidades de repetición representadas por la fórmula (1): y (b) unidades de repetición representadas por cualquiera de la fórmula (2) o la fórmula (4): en la que R 1 representa un grupo aromático que puede tener un sustituyente, o un grupo cicloalquilo, y en la que R 4 y R 5 son idénticos o diferentes, y representan un átomo de hidrógeno o un grupo alquilo, con la condición de que R 4 y R 5 no sean simultáneamente átomos de hidrógeno.
Abstract:
A chain metal powder which is free from branches and is nearly uniformed in the chain length can be obtained by a process which comprises reducing ferromagnetic metal ions contained in an aqueous solution, while applying a magnetic field to the solution, in the presence of a polymer comprising repeating units of the formula (1) and repeating units of the general formula (2) or (4): or a process which comprises reducing ferromagnetic metal ions contained in an aqueous solution, while applying a magnetic filed to the solution, in the presence of both a reducing agent capable of generating a gas in the reduction of the metal ions and a water-soluble bubbling compound capable of forming, through the generation of a gas, a bubble layer on the surface of the aqueous solution to form a chain metal powder, separating a bubble layer formed on the surface of the aqueous solution from the solution, and recovering the chain metal powder contained in the bubble layer.