A three dimensional (3D) printing system includes a print engine, a first powder handling module, a sieve, a second powder handling module, and a controller. The controller operates the print engine to fabricate 3D articles of manufacture. The controller operates the first powder handling module to transfer excess powder from the print engine to the first powder handling module and to receive new powder. The first powder handling module dispenses powder to the sieve. The controller operates the second handling module to transfer powder from the sieve to the second powder handling module. The second powder handling module provides powder to the print engine.

The invention provides an aluminum nanosheet, having an equivalent diameter of 50 to 1000 nm, and a thickness of 1.5 to 50 nm. The invention further provides a method for preparing the aluminum nanosheet and the use thereof as a two-photon light emitting material or a Raman enhanced material.

The invention provides an aluminum nanosheet, having an equivalent diameter of 50 to 1000 nm, and a thickness of 1.5 to 50 nm. The invention further provides a method for preparing the aluminum nanosheet and the use thereof as a two-photon light emitting material or a Raman enhanced material.

A method for the production of SbM.sub.x nanoparticles is described that comprises the steps of reducing an antimony salt and optionally an alloying metal with a hydride in an anhydrous polar solvent, separating the solid product formed from the solution, preferably via centrifugation, and washing the product with water. M is an element selected from the group consisting of Sn, Ni, Cu, In, Al, Ge, Pb, Bi, Fe, Co, Ga, and 0x<2.

A method for the production of SbM.sub.x nanoparticles is described that comprises the steps of reducing an antimony salt and optionally an alloying metal with a hydride in an anhydrous polar solvent, separating the solid product formed from the solution, preferably via centrifugation, and washing the product with water. M is an element selected from the group consisting of Sn, Ni, Cu, In, Al, Ge, Pb, Bi, Fe, Co, Ga, and 0x<2.

Methods for selectively entrapping particles are disclosed. In some embodiments. a method for selectively entrapping particles includes providing a substrate at least partially submerged in a solution including a solute and solvent, where particles are dispersed in the solution. An interfacial layer may be formed on a surface of the substrate from the solute, for example spontaneously. The solute may be a polymer binder. The particles may then be entrapped in the interfacial layer. Thus, the particles may be dispersed in the solution and entrapped out of the solution. Entrapping may include applying a balance of viscous force and centrifugal force to the particles.

Methods for selectively entrapping particles are disclosed. In some embodiments. a method for selectively entrapping particles includes providing a substrate at least partially submerged in a solution including a solute and solvent, where particles are dispersed in the solution. An interfacial layer may be formed on a surface of the substrate from the solute, for example spontaneously. The solute may be a polymer binder. The particles may then be entrapped in the interfacial layer. Thus, the particles may be dispersed in the solution and entrapped out of the solution. Entrapping may include applying a balance of viscous force and centrifugal force to the particles.

A surface treatment method for a hydrogen absorbing alloy powder of the present disclosure is used for a surface treatment on a hydrogen absorbing alloy powder containing rare earth elements and nickel as constituent elements, including an immersion process in which the hydrogen absorbing alloy powder is immersed in an aqueous alkaline solution; and a removal process in which a liquid containing the hydrogen absorbing alloy powder immersed in the aqueous alkaline solution is introduced into a liquid cyclone, and undesired substances having a smaller specific gravity than the hydrogen absorbing alloy powder adhered to the surface of the hydrogen absorbing alloy powder are removed.

A manufacturing method of alloy powder includes shaping a flowing fluid made of coolant liquid into a liquid film which has a predetermined thickness between 0.1 mm and 15 mm by continuously supplying the coolant liquid from a nozzle onto an inner wall of a drum; applying a predetermined acceleration to the liquid film along a thickness direction of the liquid film, wherein the predetermined acceleration has a value between 2.010.sup.4 G and 1.010.sup.7 G; supplying the liquid film with molten alloy which is not divided into a size of the predetermined thickness or less; and dividing the molten alloy into the size of the predetermined thickness or less by the flowing fluid to make alloy particles, and keeping the alloy particles in the liquid film by the predetermined acceleration so that the alloy particles are continuously in contact with the flowing fluid so as to be cooled.

A manufacturing method of alloy powder includes shaping a flowing fluid made of coolant liquid into a liquid film which has a predetermined thickness between 0.1 mm and 15 mm by continuously supplying the coolant liquid from a nozzle onto an inner wall of a drum; applying a predetermined acceleration to the liquid film along a thickness direction of the liquid film, wherein the predetermined acceleration has a value between 2.010.sup.4 G and 1.010.sup.7 G; supplying the liquid film with molten alloy which is not divided into a size of the predetermined thickness or less; and dividing the molten alloy into the size of the predetermined thickness or less by the flowing fluid to make alloy particles, and keeping the alloy particles in the liquid film by the predetermined acceleration so that the alloy particles are continuously in contact with the flowing fluid so as to be cooled.