Capillary-driven heat pipes are an effective thermal solution for compacting electronic cooling systems. We advance such a heat pipe thermal solution with ultralightweighting for mobile applications. In our advancement, the envelope that encapsulates the phase-change process of a working fluid is fabricated via electroless plating being ∼40 μm thick. Furthermore, the wick structure that transports condensate to a heat source via capillarity is also electroless-plated onto the envelope’s inner surfaces, creating a 100-μm-thick, microporous layer. This wick structure is sequentially superhydrophilized by blackening that forms a nanotexture on the microporous wick layer. An effective density of our prototype ultralight heat pipes (uHPs), as a measure of lightweighting, indicates, on average, a remarkable 73% weight reduction of commercial counterparts with sintered copper powder wick in similar exterior dimensions (e.g., ∼2.7 g, compared to ∼10.0 g) while providing equivalent heat spreading. Furthermore, the uHP operates at a 25% lower evaporator temperature, due to additional heat rejection to the surroundings through the ultrathin-walled envelope and wick.

中文翻译：

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超轻毛细管驱动热管

毛细管驱动热管是紧凑型电子冷却系统的有效热解决方案。我们为移动应用开发了一种超轻量化的热管散热解决方案。在我们的进展中，封装工作流体相变过程的外壳是通过化学镀制造的，厚度约为 40 μm。此外，通过毛细管现象将冷凝水输送到热源的芯结构也被化学镀到外壳的内表面上，形成一个 100 微米厚的微孔层。该吸芯结构通过黑化顺序被超亲水化，从而在微孔吸芯层上形成纳米纹理。我们的原型超轻热管 (uHP) 的有效密度（作为轻量化的衡量标准）表明，与具有类似外部尺寸（例如，~2.7 克）的烧结铜粉芯的商用同类产品相比，平均重量显着减轻了 73%。至〜10.0 g），同时提供同等的散热。此外，由于通过超薄壁外壳和吸芯向周围环境排放额外热量，uHP 的运行蒸发器温度降低了 25%。