COMPOSITE MATERIAL FOR PASSIVE RADIATIVE COOLING

1 - 52 . (canceled)

53 . A method of providing a composite material for passive radiative cooling to a roof surface, said method comprising:

applying to said roof surface a liquid suspension of microparticles in a liquid binding agent and

curing said binding agent so as to form a thermally-emissive layer on said roof surface, whereby said thermally-emissive layer is affixed to said roof surface via said binding agent.

54 . The method of claim 53 , wherein said object comprises a base layer to which said liquid suspension is applied, said base layer comprising a reflective substrate.

55 . The method of claim 54 , wherein said reflective substrate is composed of at least one of aluminum, silver, glass, polyurethane, nylon, and polyethylene fibers.

56 . The method of claim 54 , wherein said reflective substrate comprises paint.

57 . The method of claim 53 , wherein said binding agent is composed of a polymer material.

58 . The method of claim 53 , wherein said binding agent is transparent.

59 . The method of claim 53 , wherein said binding agent includes a characteristic thickness less than or equal to approximately 50 μm.

60 . The method of claim 53 , wherein said at least one emissive layer is composed of silica material.

61 . The method of claim 53 , wherein said at least one emissive layer comprises a plurality of microparticles.

62 . The method of claim 61 , wherein each of said plurality of microparticles is composed of silica material.

63 . The method of claim 61 , wherein each of said plurality of microparticles includes a characteristic dimension between about 5 to about 50 μm.

64 . The method of claim 61 , wherein each of said plurality of microparticles includes a characteristic dimension less than or equal to 30 μm.

65 . The method of claim 53 , wherein said liquid suspension is applied in the form of a spray.

66 . A liquid suspension composition adapted to form a passive radiative cooling coating on a surface, said composition comprising:

a liquid suspension of microparticles in a liquid binding agent, said binding agent adapted to be disposed upon a surface and cured so as to form a thermally-emissive layer on said surface, whereby said thermally-emissive layer is affixed to said surface via said binding agent.

67 . The method of claim 66 , wherein said binding agent is composed of a polymer material.

68 . The method of claim 66 , wherein said binding agent is transparent.

69 . The method of claim 66 , wherein said microparticles are composed of silica material.

70 . The method of claim 69 , wherein each of said plurality of microparticles includes a characteristic dimension between about 5 to about 50 μm.

71 . The method of claim 69 , wherein each of said plurality of microparticles includes a characteristic dimension less than or equal to 30 μm.

72 . The method of claim 66 , wherein said liquid suspension is of sufficiently reduced viscosity to be applied to a surface in the form of a spray.

73 . A liquid suspension composition adapted to form a passive radiative cooling coating on a surface, said composition comprising:

a liquid suspension of a microparticles composed of silica material in a liquid binding agent composed of a transparent polymer material, said binding agent adapted to be disposed upon a surface and cured so as to form a thermally-emissive layer on said surface, whereby said thermally-emissive layer is affixed to said surface via said binding agent.

74 . The method of claim 73 , wherein each of said plurality of microparticles includes a characteristic dimension between about 5 to about 50 μm.

75 . The method of claim 73 , wherein each of said plurality of microparticles includes a characteristic dimension less than or equal to 30 μm.

76 . The method of claim 73 , wherein said liquid suspension is of sufficiently reduced viscosity to be applied to a surface in the form of a spray.