Micro-object extraction method using diffusiophoresis, and micro-object identification method using same

A micro-object extraction method using diffusiophoresis, the micro-object extraction method comprising:

• preparing a micro-object collection and extraction apparatus including a first microchannel and a second microchannel being spaced apart from each other, a collection channel extending from the second microchannel to the first microchannel, and a connection nanochannel connecting the first microchannel to the collection channel;
• collecting micro-objects into the collection channel by chemiphoresis caused by a concentration difference between a first solution and a second solution and by electrophoresis caused by a diffusivity difference of the first solution by flowing the first solution having a first concentration into the first microchannel and flowing the second solution having a lower second concentration than the first concentration and the micro-objects together into the second microchannel;
• and
• extracting the micro-objects from the collection channel to the second microchannel by chemiphoresis caused by a concentration difference between the third solution and the fourth solution and by electrophoresis caused by a diffusivity difference of the third solution by flowing a third solution having a third concentration into the first microchannel and flowing a fourth solution having a lower fourth concentration than the third concentration into the second microchannel.