Abstract: A compact antenna module with integrated thermal management. The module includes at least one antenna and amplifier such as power amplifiers or low-noise amplifiers. An anisotropic thermal interface material is positioned such that it is in thermal communication with these components. The anisotropic thermal interface material includes plural aligned thermally anisotropic composite layers having a first thermal conductivity in a first direction and a second, larger thermal conductivity in a second direction and extend substantially parallel to each other in the first direction. The layers include hexagonal boron nitride (hBN) in a binder aligned in the second direction approximately perpendicular to the first direction such that x-y planes of the hBNalign in the second direction. In this manner, the thermal conductivity in the second direction is at least 13.5 W/mK, with a dielectric constant of less than 4, and a loss tangent of less than 0.007.

Abstract: An anisotropic thermal interface device including plural aligned thermally anisotropic conductive composite layers. Each layer has a first thermal conductivity in a first direction and a second, larger thermal conductivity in a second direction. The aligned thermally anisotropic conductive composite layers extend substantially parallel to each other in the first direction and include 45-95 weight percent graphite flakes aligned in the second direction. The thermally anisotropic conductive composite layers have a binder including a branched siloxane. The thermally anisotropic conductive composite layers are adhered to adjacent thermally anisotropic conductive composite. The thermally anisotropic conductive composite layers have a second thermal conductivity of 25 to 45 W/mK. The anisotropic thermal interface device has an arithmetic average surface roughness of 5 to 20 ?m and a tensile strength of 50 to 130 KPa.

Abstract: Graphene oxide aerogel beads (GOABs) are formed that have a core/shell structure where a smooth shell covers a multi-layer core. The smooth shell and the layers of the multilayer core comprise graphene oxide or reduced graphene oxide. The GOABs can include a phase-change material encapsulated within the multi-layer core. The GOABs can be combined or decorated with Fe3O4 nanoparticles or MoS2 microflakes for various applications. The GOABs are formed from aqueous slurries of graphene oxide that is extruded as drops into an aqueous solution of a coagulant where GOABs are formed. The GOABs are washed and freeze dried, after which, the GOABs can be reduced as desired by chemical or thermal means. Impregnation can be carried out with the phase-change material.

Abstract: Graphene oxide aerogel beads (GOABs) are formed that have a core/shell structure where a smooth shell covers a multi-layer core. The smooth shell and the layers of the multilayer core comprise graphene oxide or reduced graphene oxide. The GOABs can include a phase-change material encapsulated within the multi-layer core. The GOABs can be combined or decorated with Fe3O4 nanoparticles or MoS2 microflakes for various applications. The GOABs are formed from aqueous slurries of graphene oxide that is extruded as drops into an aqueous solution of a coagulant where GOABs are formed. The GOABs are washed and freeze dried, after which, the GOABs can be reduced as desired by chemical or thermal means. Impregnation can be carried out with the phase-change material.

Abstract: The invention discloses a La(Fe,Si)13-based hydride magnetic refrigeration material comprising multiple interstitial atoms and showing a high-temperature stability and a large magnetic entropy change and the method for preparing the same. By reintroducing interstitial hydrogen atoms into an interstitial master alloy La1-aRaFe13-bSibXc through a hydrogen absorption process, a compound with a chemical formula of La1-aRaFe13-bSibXcHd and a cubic NaZn13-type structure is prepared, wherein R is one or a combination of more than one rare-earth element, X is one or more C, B and the like or their combinations. A desired amount of hydrogen is obtained through a single hydrogen absorption process by means of controlling the hydrogen pressure, temperature and period in the process of hydrogen absorption. The compound can be stable under normal pressure, at a temperature of room temperature to 350° C., that is, the hydrogen atoms can still exist stably in the interstices.