Magnetic liquid is a stable colloidal system formed by highly dispersing nanometer magnetic particles in a certain liquid.The characteristics and preparation method of magnetic liquid as well as its applications in a wide variety of fields are introduced in this paper.

This paper introduces the developing history,structure and preparation method of carbon nano-tube.Moreover,the applications of the carbon nano-tube in the fiber materials,composite materials,electronic devices,catalysis and storing hydrogen are given.

The main types of the nanometer materials applied in biomedicine at present are nanometer carbon material,nanometer polymers and nanometer composite material.The nanometer materials have extensive application prospects in a lot of aspects of biomedicine.

Collecting and processing of information is an important part of scientific inquiry.It is significant for students to throw themselves into this process for significant construction of knowledge,developing ability of scientific inquiry,feeling attitude and values.The methods of collecting data include observing,experiment,referring,communication,investigating and visiting.On the base of using logic and scientific abstract,the methods of processing information include table,figure and scientific symbol.