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A heat pipe includes a sealed thermally conductive casing having a length that has a first end for coupling to a heat source to be cooled and a second end for coupling to a heat sink opposite the first end. The casing has an inside surface that defines a thermal control volume above. The thermal con

A heat pipe includes a sealed thermally conductive casing having a length that has a first end for coupling to a heat source to be cooled and a second end for coupling to a heat sink opposite the first end. The casing has an inside surface that defines a thermal control volume above. The thermal control volume includes (i) a plurality of hydrophilic particles or clusters of hydrophilic particles in a size range from nano size to micron size attached as a hydrophilic film to the inside surface or to a wick on the inside surface, wherein the plurality of hydrophilic particles occupy only a portion of an area of the inside surface or an internal pore space of the wick or a surface area of the wick, (ii) a vapor cavity above the hydrophilic film or the wick, and (iii) a heat transfer working fluid contained as a liquid on the hydrophilic film or the wick, and as a vapor in the vapor cavity. The plurality of hydrophilic particles or clusters of hydrophilic particles provide a solid-liquid contact angle for the working fluid when in a liquid state of 30 degrees, typically 10 degrees.

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1. A heat pipe, comprising: a sealed thermally conductive casing having a length that comprises a first end for coupling to a heat source to be cooled and a second end for coupling to a heat sink opposite said first end, said casing having an inside surface that defines a thermal control volume abov

1. A heat pipe, comprising: a sealed thermally conductive casing having a length that comprises a first end for coupling to a heat source to be cooled and a second end for coupling to a heat sink opposite said first end, said casing having an inside surface that defines a thermal control volume above;wherein said thermal control volume comprises: (i) a wick comprising a plurality of pores having a pore size defining an interstitial pore volume that extends over a full thickness of said wick or a plurality of microgrooves each having a groove space;(ii) a plurality of hydrophilic particles or clusters of said hydrophilic particles smaller than said pore size or dimensions of said groove space in a size range from nanosize to 5 microns attached as a hydrophilic film to said wick and distributed throughout said interstitial pore volume or distributed throughout said groove spaces, wherein said plurality of particles or said clusters of said hydrophilic particles occupy only a portion of said interstitial pore volume or said groove space;(iii) a vapor cavity above said wick, and(iv) a heat transfer working fluid contained as a liquid in said wick, and as a vapor in said vapor cavity,wherein said plurality of hydrophilic particles or clusters of said hydrophilic particles comprise activated particles or activated clusters of said hydrophilic particles which have a chemisorbed layer of said working fluid on their surface which provides a solid-liquid contact angle for said working fluid when in a liquid state of <30 degrees. 2. The heat pipe of claim 1, wherein said contact angle is <10 degrees. 3. The heat pipe of claim 1, wherein said wick includes said plurality of microgrooves. 4. The heat pipe of claim 1, wherein said wick includes said plurality of pores, and wherein said pore size is <100 μm. 5. The heat pipe of claim 1, wherein said wick comprises said plurality of pores, and said activated hydrophilic particles or said activated clusters of said hydrophilic particles fill 2 to 30% of said interstitial pore volume. 6. The heat pipe of claim 1, said wick comprises said plurality of pores, and wherein said activated hydrophilic particles or said activated clusters of said hydrophilic particles fill 2 to 10% of said interstitial pore volume. 7. The heat pipe of claim 1, wherein said activated hydrophilic particles or said activated clusters of said hydrophilic particles comprise silicon. 8. The heat pipe of claim 1, wherein said heat transfer working fluid comprises water, ammonia or methanol. 9. A heat pipe, comprising: a sealed thermally conductive casing having a length that comprises a first end for coupling to a heat source to be cooled and a second end for coupling to a heat sink opposite said first end, said casing having an inside surface that defines a thermal control volume above;wherein said thermal control volume comprises: (i) a wick comprising a plurality of pores having a pore size defining an internal pore volume that extends over a full thickness of said wick;(ii) a plurality of hydrophilic particles or clusters of said hydrophilic particles smaller than said pore size in a size range from nanosize to 5 microns attached as a hydrophilic film to said wick and distributed throughout said internal pore volume, and wherein said plurality of hydrophilic particles or said clusters of said hydrophilic particles occupy only a portion of said interstitial pore volume;(iii) a vapor cavity above said wick, and(iv) a heat transfer working fluid contained as a liquid in said wick, and as a vapor in said vapor cavity,wherein said plurality of hydrophilic particles or clusters of said hydrophilic particles comprise activated particles or activated clusters of said hydrophilic particles which have a chemisorbed layer of said working fluid on their surface which provides a solid-liquid contact angle for said working fluid when in a liquid state of <10 degrees. 10. The heat pipe of claim 9, wherein said wick comprises said plurality of pores, and said hydrophilic particles or clusters of said hydrophilic particles fill 2 to 10% of said interstitial pore volume. 11. The heat pipe of claim 9, wherein said activated hydrophilic particles or said activated clusters of said hydrophilic particles comprise silicon. 12. The heat pipe of claim 9, wherein said heat transfer working fluid comprises water, ammonia or methanol.