用碳纳米管降低净化水的费用海水淡化、污水处理等的费用很高。由美国政府支持的加利福尼亚大学Lawrence Livermore国家实验室,最近开发了一种新型的碳纳米管,可以降低除去水中盐分的费用。这种碳纳米管的直径为1.4～2nm,相当于头发丝直径的五万分之一。纳米管只能允许6个水分子大小的物质沿管的轴向穿过,更大的分子不能通过。 Carbon nanotubes to reduce the cost of purified water desalination, sewage treatment costs are high. Lawrence Livermore National Laboratory, University of California, backed by the U.S. government, recently developed a new type of carbon nanotube to reduce the cost of removing salt from water. The diameter of such carbon nanotubes is 1.4 ~ 2nm, equivalent to one hundred thousandth of the hair wire diameter. Nanotubes can only allow 6 molecules of water molecules to pass along the axial direction of the tube, larger molecules can not pass.