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The present invention provides an electroconductive adhesive which is desirably sintered at low temperatures even without pressurization during the sintering of the electroconductive adhesive, and which forms a sintered body that has high denseness and high mechanical strength (shear strength) if used as an electroconductive adhesive. An electroconductive adhesive which contains a solvent and silver particles that have an average particle diameter within the range of from 20 nm (inclusive) to 500 nm (exclusive), wherein the moisture content in the electroconductive adhesive is 1,300 ppm or less.

A microchannel chip (1) includes a resin substrate (2) manufactured using a mold formed by direct engraving, and including a channel groove (21) on one surface of the resin substrate (2); and a covering material (3) joined to the resin substrate (2) to cover the channel groove (21). In the resin substrate (2), the roundness of a corner (2c) formed at a boundary between a joint surface (2a) to the covering material (3) and an inner surface (2b) defining the channel groove (21) is R5 µm or less.

This invention relates to the field of catalyst technology, providing a supported ruthenium-based catalyst, its preparation method, and its application. The supported ruthenium-based catalyst provided by this invention comprises a support and an active metal Ru; the active metal Ru is dispersed on the surface of the support in the form of elemental atom clusters and Ru oxide clusters; the elemental Ru atom clusters are dispersed around the Ru oxide clusters; the support is an oxygen-containing support. The supported ruthenium-based catalyst provided by this invention exhibits high hydrogenation selectivity and activity. When applied to the selective hydrogenation reduction reaction of 2,4-dinitroaniline, it can effectively improve the conversion rate of the reactants and the selectivity of the target product, 4-nitro-o-phenylenediamine. The preparation method provided by this invention is simple, easy to operate, and suitable for large-scale production.