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    [资讯]新型散热石墨膜完美解决手机发热问题 [复制链接]

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    在线cyqdesign
     
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    只看楼主 倒序阅读 楼主  发表于: 10-13
    随着科技不断进步,智能手机的功能越来越强大,但也同样带来了一些其他问题,比如发热。但对于手机设计师和工程师来说,解决发热问题的同时还要兼顾空间问题。来自阿卜杜拉国王科技大学的一项新研究开发了一种全新的散热石墨膜,不仅能够完美解决手机发热的问题,占用的空间也十分有限。 19y 0$e_V  
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    据悉,石墨膜具有优异的导热性能,为电子产品的薄型化发展提供了可能,是电子设备散热的理想材料。但是其制作成本相对较高,需要在高达3200℃的高温下加工,成品厚度也有几微米。 rc~Y=m   
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    阿卜杜拉国王科技大学研究人员表示,使用聚合物作为源材料来制作这些石墨膜的方法非常复杂,而且非常耗费能源。因此,他们开发了一种更廉价和有效的散热石墨膜。 FN{/.?w(  
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    科学家通过使用镍箔作为催化剂,将热甲烷气体转化为石墨。而这一过程仅需在900℃的温度下完成,并且在镍箔表面形成的石墨膜只有100纳米厚。 "Gh#`T0#a  
    Y^eX@dE FR  
    研究人员称这种新材料为为纳米厚石墨膜(NGFs),比目前使用的微米厚的石墨膜要薄得多。此外,纳米厚石墨膜还带来了前所未有的灵活性和坚固性,并且生产成本也大大降低。 oS!/|#m n  
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    值得一提的是,纳米厚石墨膜还具有导电性,因此还能够用于太阳能电池的组件,或用于探测二氧化氮气体的传感器
     
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    离线tassy
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    只看该作者 1楼 发表于: 10-14
    石墨膜解决手机发热的问题
    离线bairuizheng
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    只看该作者 2楼 发表于: 10-14
    石墨烯好象是魔戒一样,点石成金
    离线mang2004
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    只看该作者 3楼 发表于: 10-14
    Next-gen smartphones to keep their cool u= l0f6W  
    King Abdullah University of Science & Technology (KAUST) }{#7Z8   
    s #`cX0L)  
    The powerful electronics packed inside the latest smartphones can be a significant challenge to keep cool. KAUST researchers have developed a fast and efficient way to make a carbon material that could be ideally suited to dissipating heat in electronic devices. This versatile material could also have additional uses ranging from gas sensors to solar cells. X@eg<]'m  
    Many electronic devices use graphite films to draw away and dissipate the heat generated by their electronic components. Although graphite is a naturally occurring form of carbon, heat management of electronics is a demanding application and usually relies on use of high-quality micrometer-thick manufactured graphite films. "However, the method used to make these graphite films, using polymer as a source material, is complex and very energy intensive," says G. Deokar, a postdoc in Pedro Costa's lab, who led the work. The films are made in a multistep process that requires temperatures of up to 3200 degrees Celsius and which cannot produce films any thinner than a few micrometers. yI *M[0  
    Deokar, Costa and their colleagues have developed a quick, energy-efficient way to make graphite sheets that are approximately 100 nanometers thick. The team grew nanometer-thick graphite films (NGF) on nickel foils using a technique called chemical vapor deposition (CVD) in which the nickel catalytically converts hot methane gas into graphite on its surface. "We achieved NGFs with a CVD growth step of just five minutes at a reaction temperature of 900 degrees Celsius," Deokar says. [BE:+ ID3  
    The NGFs, which could be grown in sheets of up to 55 square centimeters, grew on both sides of the foil. It could be extracted and transferred to other surfaces without the need of a polymer supporting layer, which is a common requirement when handling single-layer graphene films. q4zSS #]A  
    Working with electron microscopy specialist Alessandro Genovese, the team captured cross-sectional transmission electron microscopy (TEM) images of the NGF on nickel. "Observing the interface of the graphite films to the nickel foil was an unprecedented achievement that will shed additional light on the growth mechanisms of these films," Costa says. Lqq*Nr  
    In terms of thickness, NGF sits between commercially available micrometer-thick graphite films and single-layer graphene. "NGFs complement graphene and industrial graphite sheets, adding to the toolbox of layered carbon films," Costa says. Due to its flexibility, for example, NGF could lend itself to heat management in flexible phones now starting to appear on the market. "NGF integration would be cheaper and more robust than what could be obtained with a graphene film," he adds. - YAO3  
    However, NGFs could find many applications in addition to heat dissipation. One intriguing feature, highlighted in the TEM images, was that some sections of the NGF were just a few carbon sheets thick. "Remarkably, the presence of the few-layer graphene domains resulted in a reasonable degree of visible light transparency of the overall film," Deokar says. The team proposed that conducting, semitransparent NGFs could be used as a component of solar cells, or as a sensor material for detecting NO2 gas. "We plan to integrate NGFs in devices where they would act as a multifunctional active material," Costa says.
    离线dushunli
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    只看该作者 4楼 发表于: 10-14
    新型散热石墨膜!
    离线tomryo
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    只看该作者 5楼 发表于: 10-14
    新型散热石墨膜完美解决手机发热问题
    离线songshaoman
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    只看该作者 6楼 发表于: 10-14
    赶紧市场化
    在线thorn12345
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    只看该作者 7楼 发表于: 10-14
    散热石墨膜
    离线木子示羊
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    只看该作者 8楼 发表于: 10-14
    新型散热石墨膜完美解决手机发热问题
    离线mmttxiaoxiao
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    只看该作者 9楼 发表于: 10-14
    散热是个大问题
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