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Nanocapillary gas chromatograph

IP.com Disclosure Number: IPCOM000029832D
Original Publication Date: 2004-Jul-14
Included in the Prior Art Database: 2004-Jul-14
Document File: 5 page(s) / 73K

Publishing Venue



This invention teaches a structure consisting of a micro fabricated nano gas-chromatography system using nano-piping as nano-chromatographic columns, nano-valve and nano-detector fabrication technology

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Nanocapillary gas chromatograph

Fig. 1 shows the system design of the chromatograph and Fig 2. shows the top view of the NGC unit.

010 is the carrier gas supply unit, can be but not limited to portable cylinder gases of argon, helium, nitrogen. 020 is an optional gas filter/purifier. The nano gas chromatograph (NGC) is thermally heated in a nano-oven environment 065 and the entire unit is packaged in a case 070. NGC consists of the nano separation column 050, the nano detector 060. 030 is the electronics for temperature sensing, control heating of




To Exhaus



050 060


380350 351 352


353 360



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the NGC unit. 035 is the controller and driver for the nano-valves and 040 is the electronics for the nano-sensor. 360 is the nano-column for analytical separation. Techniques of making a nano-column have been described in a related disclosure. The nano-column is a long serpentine of nanotubing. Using a nanotubing of 5 micron diameter and at 5 micron pitch, for example, a total length of 10 meter of nanotubing can be fabricated on a 1x1 cm die area. The nano-column can be fabricated on but not limited to silicon wafer or glass substrate, and it can also be fabricated in a polymer body by nanolithography.. It is connected to a sample gas coupler 353. 353 servers as a sampler splitter to prevent overloading the nano-column with analytical samples. 353 connected to both gas exhaust 352 and the nano-column 360. During normal operation, inert carrier gas (such as argon, or helium or nitrogen) from 350 flowed through the splitter 353 and exit to exhaust 352. It also flow into the nano-column, passes through the nano-detector 370 and exit to another exhaust 380. During analysis, sampled injected through 351 is swept through the mixing section of 353 and diluted with the carrier gas. Majority of the diluted sample from the mixing section in 353 is carried away to exhaust 352 while a small fraction of the diluted sample is swept into the nano-analytical column 360. The gas sample is separated into individual gas components inside 360 through differential interaction with the coating m...