Abstract: A heat transport fluid includes a base fluid; and solid particles which are dispersed in the base fluid, have an average particle diameter of 200 to 400 nm, and have a potential difference of 35 mV or more from the base fluid, and a heat transport device uses the heat transport fluid.

Abstract: A heat transport fluid includes a base fluid; and solid particles which are dispersed in the base fluid, have an average particle diameter of 200 to 400 nm, and have a potential difference of 35 mV or more from the base fluid, and a heat transport device uses the heat transport fluid.

Abstract: An exhaust gas filter including a filter base body which has many pores and has a flow-in surface, in which exhaust gas containing particulate matter flows, and an exhaust surface, from which purified gas is exhausted, the exhaust gas filter having at least a function of removing the particulate matter from the exhaust gas by passing the exhaust gas through the filter base body from the flow-in surface toward the exhaust surface, wherein a micropore structure, in which agglomerates of particulates having fine gaps are connectedly provided and which is air-permeable and which collects the particulate matter contained in the exhaust gas, is provided at the filter base body at a surface and/or within the pores which open and communicate the flow-in surface and the exhaust surface to and with one another.