NANOPOROUS MATERIAL COATING METHOD FOR HEAT TRANSFER CONTROL, COATING LAYER USING SAME, SUBSTRATE COMPRISING SAME, HEAT CONTROL ELEMENT, AND SYSTEM

摘要

The present invention relates to a surface treatment method, and more particularly, to a method for coating the surface of a substrate with nanoporous material for heat transfer control. The method includes the steps of: producing a nanoporous material; depositing an organic functional group on the surface of a substrate where said nanoporous material is to be coated; and covalently bonding the nanoporous material to the surface of the subtrate. The method according to the present invention has the following advantages: the coating layer is provided with numerous active nucleation sites; enables gas to be stored in the pores; provides a large contact area between liquid and gas, high capillary pressure and excellent wettability; and enables a superior combination of bubbles and high bubble detachment frequency. Accordingly, the coating layer of the present invention provides a low temperature boiling point, a high critical heat flux and a high heat transfer coefficient. The present coating layer can be produced into a thin film having a thickness of a few microns or less, and can thus be used for cooling a substrate which generates a large amount of heat in a confined area, such as a computer CPU, LEDs, mobile phone, or the like. The present coating layer also overcomes the problem of increased heat resistance. The nanoporous material has a large surface area, and the coating layer is excellent in moisture absorbance and water repellence. The coating layer of the present invention is strongly bonded to the surface of the substrate, and can be used stably over extended periods without the coating layer peeling off even with extended exposure to vibrations.