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¿µÁøÄÚÆÛ·¹ÀÌ¼Ç Á¾ÇÕÄ«´Ù·Î±×
| Application ¸®½ºÆ® |    

Publication    
eate Krause, Gudrun Petzold, Sven Pegel, Petra Potschke. CARBON 47 (2009) 602-612
Introduction    
Carbon Nano Tube (CNT) ¸¦ È¿°úÀûÀ¸·Î »ç¿ëÇϱâ À§Çؼ­´Â CNT ¸¦ distribution ÇÏ°í dispersion ÇÏ´Â °ÍÀÌ ¸Å¿ì Áß¿äÇÑ ÀÛ¾÷ÀÌ´Ù.
CNT ÀÇ tube ´Â ÇÕ¼º°úÁ¤ µîÀÇ °úÁ¤¿¡¼­ °­·ÂÇÑ van der waals force ¿¡ ÀÇÇØ agglomerate ¶Ç´Â bundle ÇÏ°Ô µÇ¾î entangled structure ¸¦ ¶ç°Ô µÇ´Âµ¥ ÀÌ ±¸Á¶¿¡ ÀÇÇØ CNT ´Â aqueous ¿¡¼­ stability °¡ ¸Å¿ì ¶³¾îÁö°Ô µÈ´Ù. ¶ÇÇÑ CNT Ç¥¸éÀÇ functional group ¿¡ ÀÇÇؼ­µµ CNT ÀÇ dispersability (ºÐ»ê´É or ºÐ»êÁ¤µµ) °¡ Å©°Ô ¿µÇâÀ» ¹Þ°Ô µÈ´Ù. ±×·¯¹Ç·Î CNT ÀÇ dispersability ¸¦ °£ÆíÇÏ°í Á¤È®ÇÏ°Ô ºÐ¼®ÇÒ ¼ö ÀÖ´Â ±â¹ýÀÌ ¸Å¿ì ÇÊ¿äÇÏ´Ù. º» ¿¬±¸¿¡¼­´Â ¸î°¡Áö ÇüÅÂÀÇ CNT ¸¦ dispersion ½ÃŲ ´ÙÀ½ °¢ sample ÀÇ dispersion Á¤µµ¸¦ analytical centrifuge ÀÎ LUMiFuge (LUM) ¸¦ ÀÌ¿ëÇÏ¿© ºÐ¼®ÇÏ¿© analytical centrifuge ÀÎ LUMiFuge (LUM) ÀÌ CNT ÀÇ dispersability ¸¦ ¾î´À Á¤µµ Á¤È®È÷ ºÐ¼®ÇÏ´ÂÁö¸¦ »ìÆ캸¾Ò´Ù.

Å×½ºÆ®¿¡ »ç¿ëµÉ CNT ´Â NC7000, TsNa1, TsNa2, CNT1, CNT2, CNT3, CNT4 ÃÑ 7°¡Áö sample À» ÁغñÇÏ¿´´Ù.
NC7000 Àº Nanocyl S.A.,( Sambreville, Belgium) ¿¡¼­ ±¸ÀÔÇÏ¿´°í TsNa1, TsNa2 Àº TsinghuaNafine Nano-Powder Commercialization Engineering Center (Beijing, China) ¿¡¼­ ±¸ÀÔÇÏ¿´´Ù.
Fixed-bed technology ¿¡ ÀÇÇØ Á÷Á¢ ÇÕ¼ºÇÑ CNT1 Àº single/double-walled CNT ¿Í multi-walled CNT °¡ µ¿ÀϺñÀ²·Î ¼¯¿©ÀÖ´Â mixture À̸ç CNT2,3,4 ´Â aerosol technology ¿¡ ÀÇÇØ ÇÕ¼ºµÈ °ÍÀÌ´Ù. CNT2, 3 Àº cyclohexane À» ÀÌ¿ëÇØ ÇÕ¼ºµÇ¾úÀ¸¸ç CNT4 ´Â acetonitrile À» ÀÌ¿ëÇØ ÇÕ¼ºÇÑ °ÍÀÌ´Ù. ÀÌ ¸ðµç CNT ´Â functional group À» °¡ÁöÁö ¾Ê´Â °ÍÀ̸ç CNT ÀÚü¿¡ defects °¡ ¾ø´Â °ÍÀ» RAMAN spectroscopy µîÀÇ ¹æ¹ýÀ¸·Î È®ÀÎÇÏ¿´´Ù

ÀÌ·¸°Ô ÁغñÇÑ aqueous CNT ¿¡ surfactant ¸¦ ³Ö°í ultrasonication À» ÇÏ¿© CNT ¸¦ ºÐ»êÇÏ¿´´Ù. ¿©±â¿¡ »ç¿ëµÈ surfactant ´Â anioinc surfactant ÀÎ SDDBS (sodium dodecylbenzene sulfonate) ·Î¼­ sodium dodecyl sulphate (SDS) ¿Í °°Àº surfactant ¿¡ ºñÇØ È¿°ú°¡ °¡Àå ¶Ù¾î³ª´Ù. Ultrasonication Àº 20kHz, 40 Watt ¿¡¼­ 2½Ã°£ ó¸®ÇÏ¿´´Ù.

SDDBS ¸¦ ÷°¡ÇÑ CNT sample À» ultrasonication (ÃÊÀ½ÆÄó¸®) ÇÑ ´ÙÀ½ LUMiFuge 114 Stability Analyzer (L.U.M. Gmbh, Berlin, Germany) ¸¦ ÀÌ¿ëÇÏ¿© CNT sample ÀÇ sedimentation behaviour ¸¦ ºÐ¼®ÇÏ¿´´Ù. LUMiFuge ´Â sample À» ¿ø½ÉºÐ¸®Çϸ鼭 space and time resolved extinction profiles ¸¦ ³ªÅ¸³» ÁÖ´Â microprocessor controlled analytical centrifuge ·Î¼­ sample À» °í¼ÓÀ¸·Î ȸÀü½ÃÅ°¸é tube ³»¿¡¼­ dispersed particle ÀÌ tube ÀÇ bottom ¹æÇâÀ¸·Î À̵¿ÇÏ°Ô µÇ´Âµ¥ dispersion ÀÌ ÀßµÈ °æ¿ì À̵¿Á¤µµ°¡ ¸Å¿ì ³·°í ¹Ý´ëÀÇ °æ¿ì À̵¿Á¤µµ°¡ »ó´ëÀûÀ¸·Î ºü¸£°Ô µÈ´Ù. NIR (Near Infrared) light ¸¦ tube ¸¦ Åë°ú½ÃÄÑ tube °¢ ÁöÁ¡¿¡¼­ÀÇ transmission Á¤µµ¸¦ Curve ·Î ³ªÅ¸³»°Ô µÈ´Ù. ½Ã°£¿¡ µû¸¥ Àüü transmission curve ÀÇ º¯È­¸¦ ÇϳªÀÇ ±×·¡ÇÁ¿¡ Ç¥½ÃÇÑ °ÍÀÌ Transmission Profile ÀÌ µÈ´Ù.

ÀÌ transmission profile À» ºÐ¼®Çϸé sample ÀÇ dispersion stability ¸¦ Á¤È®ÇÏ°Ô ºÐ¼®ÇÒ ¼ö ÀÖ´Ù. Good nanoparticle dispersion ÀÎ °æ¿ì ¸ðµç nanoparticle ÀÌ surfactant ¿Í wetting ÀÌ µÇ¾î stability °¡ ÁÁ°í sedimentation rate °¡ ¸Å¿ì ³·°Ô µÇ´Â°ÍÀÌ´Ù.

¶ÇÇÑ transmission profile ¿¡¼­ 100 ? 110mm »çÀÌÀÇ profile ÀÇ º¯È­¸¦ ÇϳªÀÇ ±×·¡ÇÁ·Î Ç¥½ÃÇÏ´Â integral transmission ¸¦ ÀÌ¿ëÇϸé sedimentation velocity ¸¦ ºÐ¼®ÇÒ ¼ö ÀÖ¾î ´Ù¾çÇÑ dispersion stability °ü·Ã data ¸¦ ±¸ÇÒ ¼ö ÀÖ´Ù.

´ÙÀ½ µµÇ¥´Â °¢ CNT sample ÀÇ transmission profile µéÀÌ´Ù.















¸ðµç CNT sample ÀÇ transmission profile ¿¡¼­ ¼öÆòÀ¸·Î ³ªÅ¸³ª´Â ºÎºÐÀÌ Àִµ¥ ÀÌ´Â sample ³» ÀÔÀÚ Å©±â ºÐÆ÷°¡ ³Ð°í °¢ ÀÔÀÚµéÀº °¢°¢ÀÇ sedimentation velocity ¿¡ ÀÇÇØ Ä§°­ÇÏ°í ÀÖ´Ù´Â °ÍÀ» ÀǹÌÇÑ´Ù. ¸ðµç sample ÀÌ transmission value °¡ Áõ°¡ÇÏ´Â °ÍÀ» º¼ ¼ö ÀÖÀ¸³ª NC7000, TsNa1, CNT3, CNT4 ÀÇ °æ¿ì 9-10 transmission % ±îÁöÀÇ transmission value °¡ ¸Å¿ì ³·°Ô ÀÌ·ç¾îÁö°í ÀÖ´Ù.

¾Æ·¡ µµÇ¥´Â °¢ transmission profile ¿¡¼­ 100-110mm tube À§Ä¡¿¡¼­ °¢ profile À» integration ÇÑ integral transmission À» Ç¥½ÃÇÑ °ÍÀ¸·Î ÇØ´çÀ§Ä¡¿¡¼­ transmission profile ÀÇ º¯È­¸¦ ÅëÇØ ½Ã°£¿¡ µû¸¥ dispersion stability ¿Í sedimentation rate ¸¦ ÇÑ´«¿¡ ¾Ë ¼ö ÀÖ´Ù.



À§ µµÇ¥¿¡¼­ ±×·¡ÇÁÀÇ ±â¿ï±â°¡ ¿Ï¸¸ÇÑ NC7000, TsNa1, CNT3, CNT4 ´Â dispersion stability °¡ ¸Å¿ì ¶Ù¾î³ª°í CNT1 °ú TsNa2 ´Â stability °¡ Çö°ÝÈ÷ ¶³¾îÁø´Ù´Â °ÍÀ» ¾Ë ¼ö ÀÖ´Ù. CNT2 °æ¿ì Ãʱ⿡´Â ¿Ï¸¸Çϳª Áß¹Ý ÀÌÈÄ¿¡ ±â¿ï±â°¡ Áõ°¡Çϴµ¥ ÀÌ´Â two-step sedimentation ÀÌ ÀϾ´Ù´Â °ÍÀ» ÀǹÌÇÑ´Ù.

LUMiFuge Stability Analyzer ¸¦ ÀÌ¿ëÇÑ CNT material ÀÇ dispersion stability ºÐ¼® °á°ú´Â electron percolation threshold ºÐ¼®, Particle Image Analyzer ¸¦ ÀÌ¿ëÇÑ À̹ÌÁö ºÐ¼®, SEM ºÐ¼­°ú °°Àº ´Ù¸¥ ºÐ¼® ±â¹ýÀ» ÀÌ¿ëÇÏ¿© ±¸ÇÑ °á°ú¿Í µ¿ÀÏÇÏ¿´´Ù.

LUMiFuge Stability Analyzer ¸¦ ÀÌ¿ëÇÑ dispersion stability ºÐ¼®±â¹ýÀº STEP Space & Time Resolved Extinction Profile) Technology ¶ó ºÎ¸£¸ç ºÐ»ê ¾ÈÁ¤¼º ºÐ¼®¿¡ Ź¿ùÇÏ´Ù°í ÇÒ ¼ö ÀÖ´Ù,.




 
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