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Microfluidizer Á¾ÇÕÄ«´Ù·Î±× |
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¿µÁøÄÚÆÛ·¹ÀÌ¼Ç Á¾ÇÕÄ«´Ù·Î±× |
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graphene Àº ÇϳªÀÇ ¿øÀÚ µÎ²²¸¦ °¡Áø ź¼Ò sheet ·Î¼ ´ÙÀ½ ±×¸² ¸ð¾çÀ¸·Î µÇ¾îÀÖ´Ù.
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Graphene Àº ´ÙÀ½°ú °°Àº ¸¹Àº Ư¼ºÀ» °¡Áø´Ù.
¾öû³ª°Ô ´Ü´ÜÇÏÁö¸¸ ¸Å¿ì °¡º±´Ù.
°Ã¶º¸´Ù 200¹è ´õ °ÇÏÁö¸¸ ¹ÏÀ» ¼ö ¾øÀ» Á¤µµ·Î Àß ÈÖ¾îÁø´Ù.
Åõ¸íÇϸ鼵µ °¡Àå ¾ãÀº Ư¼ºÀ» °¡Áø´Ù
Àü±â Àüµµ ´É·ÂÀÌ °¡Àå Ź¿ùÇÏ´Ù
Çï·ý°¡½º Á¶Â÷µµ Åë°úÇÏÁö ¸øÇÒ Á¤µµ·Î ¿Ïº®ÇÑ barrier
Ãʱâ graphene Á¦Á¶´Â Á¢ÂøÅ×ÀÌÇÁ¸¦ ÀÌ¿ëÇÏ¿© È濬¿¡¼ graphene À» ¶¼¾î³»´Â ¹æ½ÄÀ̾ú´Ù.
Áö±ÝÀº chemical vapor deposition (CVD), CO2 reduction, spin coating °ú °°Àº ¹æ¹ýÀ» ÀÌ¿ëÇÏ¿© graphene À» Á¦Á¶ÇÏ°í ÀÖ´Ù.
±×·¯³ª ÀÌ·± ¹æ¹ýµéÀº ¿¬±¸¿ë ¼Ò·®»ý»ê¿¡´Â ÀûÇÕÇϳª ´ë·®»ý»ê¿¡´Â ÀûÇÕÇÏÁö ¾Ê´Ù.
ÃÊÀ½ÆÄ ºÐ»êÀåºñ¸¦ ÀÌ¿ëÇÏ¸é ¾à 0.2 g/L ÀÇ ³óµµ¿¡¼ 1~2% ÀÇ Àüȯ·ü·Î »ý»ê
Rotor-Stator Mixer ¸¦ ÀÌ¿ëÇϸé <0.1 g/L ÀÇ ³óµµ¿¡¼ <0.2% ÀÌÇÏÀÇ Àüȯ·ü·Î »ý»ê
Microfluidizer °í¾ÐºÐ»êÀåºñ¸¦ ÀÌ¿ëÇϸé 100g/L ÀÇ °í³óµµ±îÁö 󸮰¡´ÉÇϸç
    Àüȯ·ü 100% ÀÇ °íÈ¿À²·Î graphene ÀÇ »ý»êÀÌ °¡´ÉÇÏ´Ù.
    ÀÌ´Â ´Ù¸¥ ¹æ¹ý¿¡ ºñÇØ 500 - 1000 ¹è ´õ ÁøÇÑ ³óµµ¿¡¼ ºÐ»êÀÌ °¡´ÉÇÏ°í
    È濬¿¡¼ graphene À¸·Î Àüȯ½ÃÅ°´Â È¿À²Àº Microfluidizer °¡ 50 - 500 ¹è ´õ ÁÁ´Ù´Â °ÍÀ»
    ÀǹÌÇÑ´Ù.
È濬¿¡¼ graphene À» ÇÑ°ã ÇÑ°ã ¶¼¾î³»´Â µ¥´Â Àü´Ü·Â¿¡³ÊÁö (shear rate) °¡ ¸Å¿ì È¿À²ÀûÀÌ´Ù.
Microfluidizer °í¾ÐºÐ»êÀåºñ°¡ ¹ß»ý½ÃÅ°´Â shear rate ´Â 12,000,000 sec-1 ·Î¼ ¾î¶² Àåºñº¸´Ù
°·ÂÇÑ ¿¡³ÊÁö¸¦ ¹ß»ý½ÃÅ°´Âµ¥ ÀÌ °·ÂÇÑ ¿¡³ÊÁö¿¡ ÀÇÇØ graphene ÀÇ ´ë·® »ý»êÀÌ °¡´ÉÇÏ´Ù.
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SEM images taken from coatings comprising (a) starting graphite, (b) after 1 cycle,
(c) after 5 cycles, and (d) after 100 cycles through the Microfluidizer processor at 30,000 psi.
The scale bar is 5 ¥ìm.
Graphene Á¦Á¶ Å×½ºÆ®
1. Graphite : Timrex KS25 graphite flakes (90% are < 27.2 um)
  100g of graphite + 9g of SDC(sodium deoxycholate) / 1 L distilled water
2. Microfluidization
  ¸ðµ¨¸í : M110P Microfluidizer Processor (Microfluidics, USA)
  Chamber Type : Z-type geometry interaction chamber with ~ 87um wide microchannel
  Maximum Pressure : 2,000 bar (30,000psi)
  Number of passes (process cycle) : 20 and 100
  Temperature Control : 20¡É --> 50¡É --> 20¡É
3. Results
  After 20 cycles :  
- ÃÖ´ëºÐÆ÷ thickness : ~ 10 nm   - Æò±ÕºÐÆ÷ thickness : ~ 19 nm
  After 100 cycles :  
- ÃÖ´ëºÐÆ÷ thickness : ~ 7.4 nm   - Æò±ÕºÐÆ÷ thickness : ~ 12 nm
                                       
(4 nm ÀÌÇÏ : 4%,     4 ~ 70nm : 96%)
      ¡Ø Flake thickness distribution
 
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