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Introduction    
STEP Technology ¿¡ ±â¹ÝÀ» µÐ Multisample analytical centrifugation Àº ´Ù¾çÇÑ CNT (Carbon Nano tube) ºÐ»ê¹°
(dispersion) ÀÇ Ä§°­Æ¯¼º (sedimentation behavoir) À» Á¤·® ¹× Á¤¼º ºÐ¼®À» Çϴµ¥ ¸Å¿ì À¯¿ëÇÏ°Ô »ç¿ëµÈ´Ù.

º» application ¿¡¼­´Â ionic liquid (1-butyl-3-methylimidazoliumtetrafluoroborate) ¿¡¼­ ºÐ»êµÈ µÎ°³ÀÇ ´Ù¸¥ Multiwalled Carbon Nanotube (MWNT) A ¿Í B ÀÇ sedimentation Çö»óÀ» ÃøÁ¤ÇÏ¿© µÎ MWNT ºÐ»ê¹°ÀÇ ¾ÈÁ¤¼º (Dispersion Stability) À» »óÈ£ ºñ±³ÇÏ¿´´Ù.

Fingerprinting of the dispersions - different products
ºÐ»ê (dispersion) µÈ 0.1% m/m ³óµµÀÇ µÎ°³ÀÇ ´Ù¸¥ MWNT A ¿Í B ¸¦ Tube ¿¡ ³Ö°í LUM-gmbh »çÀÇ LUMiSizer Dispersion Analyzer ¼Ó¿¡¼­ 20¡É ¿¡¼­ 2300 xg ÀÇ È¸Àü·ÂÀ¸·Î ȸÀü½ÃÄÑ °¢°¢ ´ÙÀ½°ú °°Àº Transmission Profiles ¸¦ ±¸ÇÏ¿´´Ù.



Transmission Profile of MWNT A - Polydisperse sedimentation
ºÐ»êµÈ Tube ³» °¢ À§Ä¡¿¡¼­ÀÇ ÀÔÀÚÀÇ ³óµµº¯È­¸¦ Ç¥½ÃÇÏ¿©ÁÖ´Â Transmission Profile À» ÅëÇØ ¿ì¸®´Â ºÐ»ê »óŸ¦
ÆľÇÇÒ ¼ö Àִµ¥ À§ MWNT A ÀÇ Transmission Profile Àº ÀüÇüÀûÀÎ Polydisperse sedimentation ÀÇ ÇüŸ¦ ³ªÅ¸³½´Ù.
Áï ´Ù¾çÇÑ Å©±âÀÇ ÀÔÀÚ¿Í µ¢¾î¸®°¡ °¢±â ´Ù¸¥ ¼Óµµ·Î sedimentation À» ÇÏ°í ÀÖ´Ù´Â °ÍÀ» ¾Ë ¼ö ÀÖ´Ù.




Transmission Profile of MWNT B - Zone sedimentation and gradual clarification of fine fraction
MWNT A ÀÇ Transmission Profile Àº ½Ã°£¿¡ µû¶ó °¢ Profile »çÀÌÀÇ °£°ÝÀÌ ÁÙ¾îµé°í sedimentation ÀÌ ÇϳªÀÇ zone À»
ÀÌ·ç°í Àִ°ÍÀ» º¸¿©ÁÖ°í Àִµ¥ À̸¥ ÇüÅÂÀÇ Transmission Profile Àº °¢ particle µéÀÌ aggregates Çϰųª particle-particle interaction ÀÌ ÀϾ°í ÀÖ´Ù´Â °ÍÀ» ÀǹÌÇÑ´Ù.


Sedimentation velocity and Packing density for different products
À§ Transmission Profile À» ºÐ¼®ÇÏ¿© ½Ã°£ÀÇ È帧¿¡ µû¸¥ 10% Transmission value ÀÇ Tube ³» À§Ä¡ º¯È­¸¦ ±×·¡ÇÁ¿¡ Ç¥½ÃÇÏ¿´´Ù. MWNT A ÀÇ sedimentation velocity °¡ ¸Å¿ì ºü¸£°í MWNT B ´Â ±â¿ï±â°¡ ´À¸°°ÍÀ» ¾Ë¼ö ÀÖÀ¸¸ç ÀÌ´Â MWNT B °¡ MWNT A º¸´Ù ÈξÀ ºÐ»ê¾ÈÁ¤µµ (Stability) °¡ ³ô´Ù´Â°ÍÀ» ÀǹÌÇÑ´Ù.


Sedimentation velocity in different dispersion media

´Ù¸¥ media ¿¡¼­ ºÐ»êÀ» ÇÑ MWNT C,D,E,F ÀÇ (C´Â phenyl-ethanol, D.E.F ´Â 1-butyl-3-methylimidazoliumtetrafluoroborate ¿ë¾×) ÀÇ sedimentation velocity ´Â °¢±â ´Ù¸£°Ô ³ª¿À´Âµ¥ ÀÌ´Â ÀÔÀÚ ¶Ç´Â flocs ÀÇ size ¹× density, ±×¸®°í media ÀÇ viscosity ¿Í density µî¿¡ ÀÇÇØ ¿µÇâÀ» ¹Þ´Â°ÍÀ» ÀǹÌÇÑ´Ù.

 
ÀÌ µ¥ÀÌÅÍ¿¡¼­ MWNT F (most stable> > E > D > C (least stable) ÇÏ´Ù´Â °ÍÀ» ¾Ë ¼ö ÀÖ´Ù.



 
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