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À̸§ °ü¸®ÀÚ waterindustry@hanmail.net ÀÛ¼ºÀÏ 2017.06.21 Á¶È¸¼ö 610
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[¹Ì±¹] ÇöóÁî¸ó, Çؼö´ã¼öÈ­ ½Ã¼³¿¡ È¿À²Àû

 

 

¹Ì±¹ ÆÛµà´ëÇб³(Purdue University) ¿¬±¸¿øÀº ÇöóÁî¸óÀÇ »õ·Î¿î ºÐ¾ß°¡ Áö¼Ó °¡´ÉÇÑ È­ÇÐ °øÁ¤°ú È¿À²ÀûÀÎ Çؼö´ã¼öÈ­ ½Ã½ºÅÛÀ» ¹ßÀü½Ãų ¼ö ÀÖ´Ù°í ¹Ï°í ÀÖ´Ù.


ÇöóÁî¸ó ÀÚ·á¿¡´Â Ç¥¸é Çö󽺸ó(surface plasmons)À̶ó°í ºÒ¸®´Â ÀüÀÚ±¸¸§(Electron cloud)À» ÀÌ¿ëÇÏ¿© ºûÀ» Àü·Ê ¾øÀÌ Á¦¾îÇÒ ¼ö ÀÖ´Â ±â´É, ÆÐÅÏ ¶Ç´Â ¿ä¼Ò°¡ Æ÷ÇԵǾî ÀÖ´Ù.

 

ÆÛµà´ëÇÐ ºí¶óµð¹Ì¸£ ¼£·¹(Vladimir M. Shalaev)±³¼ö´Â  "Çö󽺸ó´Ð½º(Plasmonics)´Â º¼·ýÀ» º¼·ýÀ¸·Î ÀüÀڱ⠿¡³ÊÁö ÁýÁßÀÇ ±Ý¼Ó nanostructuresÀÇ µµ¿òÀ¸·Î ºû°ú ±¤È­Çп¡ ´ëÇÑ ±Ã±ØÀû ÀÎ Á¦¾î¸¦ Á¦°øÇÑ´Ù"¶ó°í ¸»ÇÑ´Ù. 

 

ÆÛµà´ëÇÐ Àü±â¡¤ÄÄÇ»ÅÍ°øÇÐ ±³¼öÀÎ Bob and Anne Burnettµµ  "¹Ì·¡¿¡ È­ÇÐ °øÁ¤À» ¿îÀü, Á¶ÀÛ, Çâ»ó ¹× ¸ð´ÏÅ͸µÇÏ´Â ¹æ½Ä¿¡ º¯È­°¡ ÀÖÀ» ¼ö ÀÖ´Ù"°í °­Á¶Çß´Ù.


½Ç¿ëÀûÀÎ ÀÀ¿ë °¡´É¼ºÀº ½ºÅÄÆ÷µå´ëÇÐÀÇ Àç·á°úÇÐ ¹× °øÇаú ±³¼öÀÎ Alberto Naldoni, Shalaev ¹× Mark Brongersma°¡ ¾´ Science MagazineÀÇ Áö¼Ó °¡´ÉÇÑ ¹Ì·¡¿¡ ´ëÇÑ ÇöóÁî¸óÀÇ Àû¿ë¿¡ ´ëÇÑ ³íÆò¿¡¼­ ³íÀǵǾú´Ù.

 

»õ·Î¿î À¯ÇüÀÇ È­ÇÐ

Ç¥¸é ÇöóÁî¸ó°ú '°øÁø³ª³ë±¸Á¶(resonant nanostructures)'´Â È­Çй°Áú°ú ¿¬·áÀÇ ÃÊ È¿À²ÀûÀÎ »ý»êÀ» À§ÇØ È°¿ëµÉ ¼ö ÀÖ´Ù. ÇÑ °¡Áö ¿¹´Â ºûÀ» ¼öÈ®ÇÏ¿© Ã˸ÅÀÛ¿ëÀ» ¼öÇàÇÏ´Â ¹ÝµµÃ¼ ÀåÄ¡¿Í °áÇÕµÈ ÀÌ·¯ÇÑ ³ª³ë ±¸Á¶ÀÇ ÀáÀçÀûÀÎ ¿ëµµÀÌ´Ù.


¹ÝµµÃ¼°¡ ¹à°Ô ºû³ª¸é ÀüÀÚ´Â ÇÑ ¿¡³ÊÁö ÁØÀ§ ¶Ç´Â ¹êµå¿¡¼­ ´Ù¸¥ °ÍÀ¸·Î À̵¿ÇÏ°í '±¸¸Û'À» ³²±â¸é¼­ 'ÈïºÐ'ÇÑ´Ù°í ÇÑ´Ù. Ç¥¸é Çö󽺸ó(plasmons)Àº Áý´ÜÀûÀ¸·Î ÈïºÐµÇ°í 'ºÎÆÐ', ¶Ç´Â ¿¡³ÊÁö¸¦ ÀҰųª, ±¤ÀÚ ¶Ç´Â ¸Å¿ì È°±âÂù, ¶ß°Å¿î ÀüÀÚ ¹× ±¸¸ÛÀ» ¹æÃâÇÏ´Â ÀüÀÚÀÇ ±×·é´Ù. ÀÌ ¶ß°Å¿î ÀüÀÚ´Â È­ÇÐ ¹ÝÀÀÀ» ÀÏÀ¸Å°´Â µ¥ »ç¿ëµÉ ¼ö ÀÖ´Ù.


Çö󽺸ó´Ð½º(Plasmonics)ÀÇ Çõ½ÅÀº °í¿Â ¹× °í¾Ð¿¡¼­¸¸ ÀϹÝÀûÀ¸·Î °¡´ÉÇÑ »õ·Î¿î À¯ÇüÀÇ È­ÇÐÀ» Ž±¸ÇÏ´Â °ÍÀ» °¡´ÉÇÏ°Ô ÇÒ ¼ö ÀÖ´Ù.  Ç¥¸é ÇöóÁî¸óÀº '±¹¼Ò °¡¿­'À» À¯¹ßÇÏ¿© »ê¾÷ °øÁ¤ÀÇ È­ÇÐ ºÐ¸® ¹× Áõ·ù, Çؼö´ã¼öÈ­¿Í °°Àº ÀÀ¿ë ºÐ¾ß¿¡ ÀûÇÕÇÏ´Ù.


¼£·¹(Shalaev) ±³¼ö´Â  "¼¼°è´Â ¹Î¹° À§±â¿¡ Á÷¸éÇÏ°í ÀÖÀ¸¸ç, ¿°ºÐÀÇ ´ã¼ö¸¦ Àú·ÅÇÏ°í È¿À²ÀûÀ¸·Î »ý»êÇÏ´Â °ÍÀºÀÌ ¼¼°èÀû µµÀü¿¡ Á¾ÁöºÎ¸¦ ÂïÀ» °Í"À̶ó¸é¼­ "Plasmonic nanoparticles´Â ¹° À§¿¡ ¶ß´Â ¸âºê·¹ÀÎÀÇ ³ª³ë ä³Î ³»ºÎ¿¡¼­ ÀÚü Á¶¸³µÉ ¼ö ÀÖ´Ù. 

 

 ¹æ»ç¼± Á¶»ç½Ã ÇöóÁî¸ó ÀåÄ¡´Â ÅÂ¾ç ½ºÆåÆ®·³ÀÇ 96% ÀÌ»óÀ» Èí¼öÇÏ°í Èí¼öµÈ ¿¡³ÊÁö¸¦ ³ª³ë ¼öÁØÀÇ ¹°¿¡ ÁýÁß½ÃÄÑ Áõ±â ¹ß»ý°ú È¿À²ÀûÀÎ ´ã¼öÈ­¸¦ °¡´ÉÇÏ°Ô ÇÑ´Ù"°í ¸»Çß´Ù.

 

Çö󽺸ó´Ð½º(Plasmonics)´Â ¶ÇÇÑ È­ÇÐ, ±â¼ú ¹× ÀÇÇÐ ºÐ¾ßÀÇ ÀÀ¿ë ºÐ¾ß¿¡ ¸ÂÃãÇü '3Â÷¿ø ¸ÞŸ ¹°Áú' ¹× ±¤ ±¸µ¿ ºÐÀÚ ·Îº¿À» »ý»êÇϱâ À§ÇØ DNA¿Í °áÇÕµÉ ¼ö ÀÖ´Ù.

 

¼£·¹(Shalaev) ±³¼ö´Â À̾î "ÀÌ·¯ÇÑ ÇöóÁî¸ó Àåºñ´Â ºÐÀÚ ¼ö¼Û ¹× Á¤º¸ ó¸®¿Í °°Àº Çö¸íÇÑ ÀÛ¾÷À» ¼öÇàÇϱâ À§ÇØ ±¸Çö µÉ ¼ö ÀÖ´Ù"°í ¸»Çß´Ù.

 

»ê¾÷ ¼öÁرîÁö ÇöóÁî¸ó È­ÇÐÀ» È®Àå½ÃÅ°±â À§Çؼ­´Â »õ·Î¿î ´ëü ÇöóÁî¸ó ¹°ÁúÀÇ °³¹ß, '¸ÞŸǥ¸é(metasurface)'ÀÇ »ç¿ë ¹× À¯¿¬ÇÑ ³ª³ë ±¤ÀÚ Ç÷§ÆûÀÇ °³¹ßÀÌ ÇÊ¿äÇÏ´Ù.

 

¼£·¹(Shalaev) ±³¼ö´Â "±ú²ýÇÏ°í Áö¼Ó °¡´ÉÇÑ »çȸ·ÎÀÇ ÀüȯÀº ÀÌ¹Ì ÁøÇàµÇ°í ÀÖ´Ù¡±¸é¼­  "Plasmonics´Â Á¤¹Ðµµ¿Í Á¦¾î°¡ °¡´ÉÇÑ ¿øÀÚ ¼öÁØÀÇ È­ÇаøÁ¤À» È°¼ºÈ­, Á¶ÀÛ, Çâ»ó ¹× ¸ð´ÏÅ͸µÇÔÀ¸·Î½á ÀÌ ÀüȯÀ» °¡¼ÓÈ­ ÇÒ ¼ö ÀÖ´Ù"°í °­Á¶Çß´Ù.

 


[¿ø¹®º¸±â]


Plasmonics offers new route to efficient desalination

 


Purdue University researchers believe the emerging field of plasmonics could bring advances in sustainable chemical processes and efficient saltwater desalination systems.


Plasmonic materials contain features, patterns or elements that enable unprecedented control of light by harnessing clouds of electrons called surface plasmons.

 

¡°Plasmonics offers the ultimate control over light and photochemistry, with the help of metallic nanostructures capable of concentrating electromagnetic energy into nanoscale volumes,¡± explains Vladimir M. Shalaev, Purdue University¡¯s Bob and Anne Burnett Distinguished Professor in Electrical and Computer Engineering. ¡°It may have a transformative impact on the way we will drive, manipulate, enhance, and monitor chemical processes in the future.¡±

 

The potential for practical applications is discussed in a commentary Applying plasmonics to a sustainable future in Science magazine, written by visiting scientist Alberto Naldoni, Shalaev, and Mark Brongersma, a professor in the Department of Materials Science and Engineering at Stanford University.

 

New types of chemistry
Surface plasmons and 'resonant nanostructures' might be harnessed for the ultra-efficient manufacture of chemicals and fuels. One example is the potential use of these nanostructures combined with semiconductor devices that harvest light to perform catalysis.

 

When semiconductors are illuminated, electrons are said to be 'excited,' moving from one energy level, or band, to another and leaving behind 'holes.' Surface plasmons are groups of electrons that collectively become excited and then 'decay,' or lose energy, re-emitting photons or highly energetic, 'hot,' electrons and holes. These hot electrons can be used to drive chemical reactions.

 

Innovations in plasmonics could make it possible to explore new types of chemistry that are typically only possible at high temperatures and pressures. The surface plasmons cause 'local heating,' which holds promise for applications such as chemical separation and distillation for industrial processes, and saltwater desalination.

 

¡°The world is facing a freshwater crisis, and cheap, efficient production of freshwater from saltwater would mean an end to this global challenge,¡± Shalaev says. ¡°Plasmonic nanoparticles can be self-assembled inside the nanochannels of a membrane that floats on water. Upon irradiation, the plasmonic device absorbs more than 96% of the solar spectrum and focuses the absorbed energy in nanoscale water volumes, enabling steam generation and efficient desalination.¡±

 

Plasmonics also might be combined with DNA to produce custom-made 'three-dimensional metamolecules' and light-driven molecular robots for applications in chemistry, technology and medicine.

 

¡°Such plasmonic machines could be implemented for carrying out smart operations such as transport of molecules and information processing,¡± he said.

 

Scaling up plasmonic chemistry to the industrial level would require development of new alternative plasmonic materials, the use of 'metasurfaces' and flexible nanophotonic platforms.

 

¡°The transition to a clean and sustainable society is already taking place,¡± Shalaev says. ¡°Plasmonics can help accelerate this changeover by enabling, manipulating, enhancing, and monitoring chemical processes with atomic-scale precision and control.¡±


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