首页
登录
职称英语
Today in mind-bendingly cool stuff that nanoparticles (纳米粒子) can do: A team
Today in mind-bendingly cool stuff that nanoparticles (纳米粒子) can do: A team
游客
2023-10-21
24
管理
问题
Today in mind-bendingly cool stuff that nanoparticles (纳米粒子) can do: A team of researchers at Rice University in Texas has demonstrated a mechanism by which they can create steam in just seconds by focusing sunlight on a mixture of water and nanoparticles. This isn’t just some artificial means of lowering boiling point either; this solar powered "boiler" can produce steam before the water even gets warm to the touch, without ever bringing the
aggregate
water to a boil.
Right now this research is very much still in the lab, and the researchers aren’t sure exactly how far they can push it. But it doesn’t take much to imagine the possibilities for a steam generator that runs solely on water and sunlight.
The technology works by mixing a small amount of either carbon or gold-coated silicon dioxide (二氧化硅) nanoparticles, each just pne-tenth the diameter of a single human hair, with water in a glass vessel. Their small diameters—smaller than the wavelength of visible light—mean that they can absorb most of a light wave’s energy rather than scattering it. So when sunlight is focused on the vessel with a lens, the particles quickly become quite hot—hot enough to vaporize (蒸发) the water directly surrounding it.
This creates a bubble of steam that envelopes the nanoparticle, which is now insulated from the cooler liquid water by the steam, which allows it to grow hotter still, vaporizing more of the water immediately around it. At some point the nanoparticle and its steam envelope become large enough to grow buoyant, at which point the whole steam bubble—particle and all—floats to the surface. The steam is released into the air, the particle falls back into the cooler water and sinks back down until it begins to absorb sunlight and heat again, at which point the process starts all over.
Multiply that by the number of nanoparticles in the mixture, and you have something of a simulated boil, but one that doesn’t require the entire pot of water to reach boiling point before the first steam bubbles head to the surface. You can think of it as a way of micromanaging the boiling process, specifically heating some parts of the water (where it touches the nanoparticles) while leaving the rest of the water cool. And the particles themselves are completely durable—they keep absorbing, heating, cooling, and absorbing again, with no need to replace them.
Pretty nuts, no? It spells an interesting future for solar power in general, but more specifically it’s easy to see how a cheap and abundant source of steam, even in low specific volumes, could be used to do anything from generate electricity and heat to lower the energy intensive nature of certain processes like water desalinization (脱盐). As the WaPo points out, the last time someone came up with a cheap and easy way to generate and harness abundant steam it completely changed the world. So there’s that. [br] We can infer from the passage that________.
选项
A、when put into water, nanoparticles are highly active and hot enough to vaporize it
B、the steam bubble with some nanoparticles in it would float to the surface with steam released
C、once the nanoparticles are used up, new ones should be put into the water again
D、efficient use of steam may reduce the energy cost in some industrial processes
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3117590.html
相关试题推荐
PassageEight[br]Whatdosmalldiametersofnanoparticlesindicate?Theycanab
Todayinmind-bendinglycoolstuffthatnanoparticles(纳米粒子)cando:Ateam
Todayinmind-bendinglycoolstuffthatnanoparticles(纳米粒子)cando:Ateam
随机试题
Thegovernmenthaspromisedtodo______liesinitspowertoeasethehardships
Inabout45years,temperaturesonEarthwillbehotterthanatanytimeduri
一、二级耐火等级地下或半地下仓库存放丁类物品,每个仓库防火分区的最大允许建筑面积
假设需要把25盒磁带数据(每盒磁带数据量40GB)从甲地传输到乙地,甲、乙相距1
眩晕常见的病理因素有A.风、痰 B.风、火、痰 C.气、火、痰 D.风、火
关于药品验收记录书写描述错误的是A:药品验收记录填写要字迹清楚,内容真实完整
在清偿顺序上位于商业银行其他债务之后,优于股权资本的债券是()。 A.金融债
甲公司为制造企业,20×4年发生的现金流量:(1)将销售产生的应收账款申请保理,
国际工程咨询公司为承包商提供咨询服务时,可提供的服务内容有( )。A.工程保险服
一套完整的财务报表至少应当包括资产负债表,利润表,现金流量表,所有者权益变动表和
最新回复
(
0
)