A method for making crown ether functionalized substrates, which includes modifying crown ether-based molecules by reacting with carboxylic acid functionalize chains. The crown ether-based molecules are then attached to substrates, thereby forming crown ether functionalized substrates.

A method for making crown ether functionalized substrates, which includes modifying crown ether-based molecules by reacting with carboxylic acid functionalize chains. The crown ether-based molecules are then attached to substrates, thereby forming crown ether functionalized substrates.

A product includes a solution comprising Ag.sub.2Se quantum dots in a solvent. The solution is colloidally stable for at least one week. A product includes a solid layer formed of Ag.sub.2Se quantum dots. The layer is at least 100 nm thick. The layer is physically characterized by a substantial absence of defects therein. A process includes forming a solution of Ag.sub.2Se quantum dots and adding at least acetonitrile to the solution. The process further includes separating the Ag.sub.2Se quantum dots from the solution and washing the Ag.sub.2Se quantum dots at least two times in a solution comprising at least acetonitrile. The process further includes redispersing the washed Ag.sub.2Se quantum dots in a nonpolar solvent to create a colloidal suspension.

A product includes a solution comprising Ag.sub.2Se quantum dots in a solvent. The solution is colloidally stable for at least one week. A product includes a solid layer formed of Ag.sub.2Se quantum dots. The layer is at least 100 nm thick. The layer is physically characterized by a substantial absence of defects therein. A process includes forming a solution of Ag.sub.2Se quantum dots and adding at least acetonitrile to the solution. The process further includes separating the Ag.sub.2Se quantum dots from the solution and washing the Ag.sub.2Se quantum dots at least two times in a solution comprising at least acetonitrile. The process further includes redispersing the washed Ag.sub.2Se quantum dots in a nonpolar solvent to create a colloidal suspension.

Provided is a powder material for a cosmetic that has excellent dispersibility in any of silicone oil agents, hydrocarbon oil agents, and ester oil agents, and does not affect the color appearance of a formulation. The powder material for a cosmetic contains a powder for a cosmetic surface-treated with an ester compound of a fatty acid having 8-20 carbon atoms and glycerol. The ester compound is at least one selected from the group consisting of diglyceryl tetraisostearate, diglyceryl triisostearate, glyceryl tri(caprylate/caprate), glyceryl dilaurate, glyceryl triisostearate, decaglyceryl monoisostearate, and decaglyceryl diisostearate.

Provided is an ink for use in electronic component production making use of screen printing, which is suitable for actually allowing fine lines with high precision to be drawn in screen printing, and for actually allowing successive screen printing operations to be performed. The ink for screen printing of the present invention includes surface-modified silver nanoparticles (A) and a solvent (B), and has a viscosity at a shear rate of 10 (1/s) and 25° C. of 60 Pa.Math.s or more. The surface-modified silver nanoparticles (A) each include a silver nanoparticle and an amine-containing protective agent coating the silver nanoparticle. The solvent (B) includes at least a terpene solvent. In solvent (B), a content of solvents having a boiling point of less than 130° C. is 20 wt % or less based on the total amount of solvents.

Provided is an ink for use in electronic component production making use of screen printing, which is suitable for actually allowing fine lines with high precision to be drawn in screen printing, and for actually allowing successive screen printing operations to be performed. The ink for screen printing of the present invention includes surface-modified silver nanoparticles (A) and a solvent (B), and has a viscosity at a shear rate of 10 (1/s) and 25° C. of 60 Pa.Math.s or more. The surface-modified silver nanoparticles (A) each include a silver nanoparticle and an amine-containing protective agent coating the silver nanoparticle. The solvent (B) includes at least a terpene solvent. In solvent (B), a content of solvents having a boiling point of less than 130° C. is 20 wt % or less based on the total amount of solvents.

To provide a metal particle composition having excellent oxidation resistance, which does not require a transition metal catalyst and can be applied to existing metal particles, a method for producing the metal particle composition, and a paste. The metal particle composition contains, with respect to 100 parts by mass of metal particles, 0.1 to 5 parts by mass of a compound (A) having a structure represented by the following general formula (I):

##STR00001## in which R.sup.1 and R.sup.2 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aryl group, or an aralkyl group, R.sup.3 and R.sup.4 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group, an alkenyl group having 2 to 6 carbon atoms, an alkenyloxy group, an aryl group, or an aralkyl group.

To provide a metal particle composition having excellent oxidation resistance, which does not require a transition metal catalyst and can be applied to existing metal particles, a method for producing the metal particle composition, and a paste. The metal particle composition contains, with respect to 100 parts by mass of metal particles, 0.1 to 5 parts by mass of a compound (A) having a structure represented by the following general formula (I):

##STR00001## in which R.sup.1 and R.sup.2 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aryl group, or an aralkyl group, R.sup.3 and R.sup.4 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group, an alkenyl group having 2 to 6 carbon atoms, an alkenyloxy group, an aryl group, or an aralkyl group.

Compositions having solid core particles with functionalizing layers over at least a portion of the outer surfaces of the solid core particles are described. The functionalizing layers are formed from a reaction product of a 1,1-di-activated vinyl compound, or a multifunctional form thereof, or a combination thereof.