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Zubarev£¬À´×ÔÃÀ¹úRice University¡£ÂÛÎÄÄÚÈÝÌá¼°£¬ÓÉÓÚ±íÃæµÈÀë×ÓÌå¹²Õñ£¨Surface-Plasmon Resonance, SPR£©µÄÒòËØ£¬Au NanorodsÔڿɼû¹âÓë½üºìÍâ¹âÇøÓò£¨Visible and NIR regions£©¾ßÓм«Ç¿µÄ¹âѧɢÉäÓëÎüÊÕ£¬Òò´ËAu NanorodsÓм«¹ã·ºµÄÓ¦Óá£ÓÉÎÄÏ×µÃÖª£¬Au NanorodsÔÚ×ÝÏòµÈÀë×ÓÌ壨Longitudinal Plasmon£©µÄÎüÊÕ£¬ÓëÆä³¤¾¶±È£¨Aspect Ratio, AR£©Óйء£È»¶ø´«Í³Óɾ§Öֳɳ¤·½·¨£¨Seed-mediated method£©ËùµÃÖ®Au NanorodsÖ®³¤¾¶±È£¬·Ç³£ÊÜÏÞÖÆ£¬½öÓÐAR=3~5£»Ðí¶àÑо¿³¢ÊÔÌáÉý³¤¾¶±È£¬µ«ÊÇÄÜ´óÓÚAR=5µÄ³É¹¦°¸ÀýÈ´·Ç³£ÉÙ¼û¡£¶øProf. Zubarev´ËƪÂÛÎÄÔòÌá³öÒ»ÖÖ¿ÉÄæµÄ·½Ê½µ÷ÕûµÈÀë×ÓÌåÎüÊշ壨Plasmon Peak£©£¬ÀûÓô˷½·¨¿ÉÒԵõ½²»Í¬³¤¾¶±È£¨AR=1~200£©Ö®Nanorods¡£ÆäÖв¢Ìáµ½£¬ÔÚAu NanorodsºÏ³É¹ý³ÌÖÐAu+ÓëAu3+´æÔÚʱ£¬·Ö±ð¶ÔNanorods³¤¶È£¨One-Dimension£©µÄ³É³¤ÓëËõ¶ÌÖ®Ó°Ïì¡£ Au NanorodsµÄºÏ³Éͨ³£»áÌí¼ÓÑôÀë×ÓÐͽӿڻîÐÔ¼ÁCTAB£¨Cetyltrimethylammonium Bromide£©µ±×÷±£»¤»ù£¬½åÓÉζȵĵ÷¿ØÒÔ¼°CTABµÄÌí¼ÓÁ¿¿ÉÒÔ¿ØÖÆAu NanorodsµÄ³¤¾¶±È£¬Æä³É³¤×÷ÓûúÖÆÍÆ²âΪ£¬CTABÎü¸½ÎªbilayerµÄ·½Ê½£¬ÇÒ»áÑ¡ÔñÐÔµÄÎȶ¨ÓÚAuµÄ±íÃæ£¬Ê¹µÃ»¹Ô³É³¤µÄ½ðÊôÁ£×ÓÑØ×Å Au(100)»òÕßAu(110)µÄ¾§Ãæ³É³¤£»ÁíÒ»²¿·Ö£¬Au Nanorods·ÇµÈ·½ÏòÐԵijɳ¤ÊÇÓÉÓÚ±íÃæµç³¡µÄ¸Ä±ä£¬Au+-CTAB»áÑ¡ÔñÔÚNanorodsµÄÄ©¶Ë³É³¤£¬Ò²¾ÍÊÇÇúÂÊ´óµÄÇøÓò³É³¤¡£Perez- JusteµÈÌá³öµÄAu NanorodsµÄ³É³¤»úÖÆÈçͼ2-1Ëùʾ¡£ ![]() ͼ2-1. Mechanism for Au nanorod formation ½ðÊôÑÎÀàÔÚË®ÈÜÒºÖпɱ»»¹ÔÄÜÁ¦Ç¿µÄ»¹Ô¼Á£¨ÈçNaBH4£©×÷ÓÃÉú³ÉÁ£¾¶Ô¼3-4 nmµÄÇò×´Au Nanoparticles£¬²¢¿É³äµ±Îª¾§ÖÖ£¨Au Seed Particles£©£¬¶øÔÚ·´Ó¦µÄ¹ý³ÌÖÐNanoparticlesµÄÿһ¸ö½á¾§ÃæÏò£¨Facets£©¾ù¿ÉÒѱ»±£»¤»ù¸½×Å¡£Au3+µÄ´æÔÚÇãÏòÐγÉÇòÐνṹµÄAu Nanoparticles£¬±ØÐëÔÚCTABµÄ´æÔÚÏ£¬½åÓɽÏÈõµÄ»¹Ô¼Á£¬ÈçAscorbic Acid£¨Î¬ËûÃüC£©£¬ÏÈÐл¹ÔΪAu+£¬´ËʱÉú³ÉµÄAu+-CTABÖмäÌ壬ÔÚ¾§ÖֵĴæÔÚÏ£¬Ñ¡ÔñÐԵijɳ¤ÎªNanorods£¬²¢ÓÐЧÌáÉý³¤¾¶±È¡£ CTABÔÚË®ÈÜÒºÖлáÐγÉÈíÐÔ¡¢°ô״΢°û£¨Soft Rodlike Micellar Template£©£¬¿É×÷Ϊ°ïÖúAu NanorodµÄ³É³¤µÄƽ̨£¬½åÓÉCTABµÄÌí¼ÓŨ¶È¿ØÖƶÔNanorodsµÄ³É³¤ÊDZØÒªµÄ¡£Òò´ËAu NanorodsµÄ³É³¤ÊÇ´ÓÔ¼3-4nmµÄ¾§ÖÖ¿ªÊ¼£¬½åÓɸ÷ÊÔ¼Á·´Ó¦Å¨¶ÈµÄµ÷¿Ø£¬¿ÉÒԵõ½¿í¶È20-30nm¡¢³¤¶È´óÓÚ600nm¡¢³¤¾¶±ÈΪ2-25µÄ°ô×´½á¹¹¡£ ![]() ͼ2-2. TEM images of Au nanorods (AR ~ 3.4): (a) in the absence of cysteine, and (b) linear assembled Au nanorods in the presence of cysteine. (c) The chemical structure of cysteine Shaping Au Nanoparticles: from Seeds to Decahedrons, from Rods to Octahedrons ´ËƪÂÛÎĽ²ÕßΪLuis M. Liz-Marzan£¬À´×ÔÎ÷°àÑÀUniversidade de Vigo£¬ÂÛÎÄÄÚÈÝÌá¼°£¬ÔÚDMFÈÜÒºÖУ¬ÒÔPVPΪÄÎÃ×½ðÁ£×ӵı£»¤»ù£¬¿É½åÓɳ¬Òô²¨Õðµ´ÒÔ¼°ÈÈÇýʹµÄÌõ¼þÏ£¬¿ÉʹAuNP£¨¾§ÖÖ£©³É³¤ÎªÊ®ÃæÌå½á¹¹£¬¶øAuNRÔò¿É³É³¤Îª°ËÃæÌå½á¹¹¡£ÆäÔÙ³ÉÐΣ¨Reshape£©µÄ¹ý³Ì¿É½åÓÉUV-Vis¹âÆ×ÓëTEM¹Û²ì¡£ÔÙ³ÉÐ͵ķ½·¨ÊÇÏÈÒÔ´«Í³µÄAuNRµÄ³É³¤·½·¨£¬ÀûÓÃCTABΪ±£»¤»ù£¬ÒÔάËûÃüCΪ»¹Ô¼Á¼´¿ÉµÃµ½Îȶ¨µÄCTAB-coated AuNR£¬ Æä´Î½«CTAB±£»¤»ù¸ÄΪPVP¡£×îºóÔÙÒÔPVP-coated AuNRµ±×÷¾§ÖÖ£¬¼ÓÈëDMF/HAuCl4/PVPΪAuǰÇýÀë×Ó£¬ÆäÖÐDMF×÷ΪÈõµÄ»¹Ô¼Á£¨ÓÚ³¬Òô²¨Õðµ´Ï¿ɽ«Au3+»¹ÔΪAu+£©£¬PVPΪ±£»¤»ù£¬¾ùÔȽÁ°èºó¾Óɳ¬Òô²¨Õðµ´ÒÔ¼°ÈÈ´¦Àí£¬¼´¿ÉʹAuNRÔÙ³ÉÐÍΪ°ËÃæÌåÐÎ×´¡£AuNRµÄÔÙ³ÉÐÍΪ°ËÃæÌå½á¹¹£¬ÓÉÓÚ³¤¾¶±È£¨Aspect Ratio£©Ï½µ£¬»áʹµÄ×ÝÏòµÈÀë×ÓÌå¹²Õñ£¨LSPR£©ÎüÊÕλÖÃÍùµÍ²¨³¤Òƶ¯£¬Ëæ×Å·´Ó¦Ê±¼äµÄÔö¼Ó£¬LSPRµÄÎüÊÕλÖûáÍùÀ¶Î»ÒÆÒƶ¯¡£ ´ËÍ⣬Èçͼ3-1 Step3Ëùʾ£¬·´Ó¦ÐèÌí¼ÓHAuCl4ΪǰÇý½ðÊôÀë×ÓÀ´Ô´£¬ÔÙÒÔAuNR×÷Ϊ¾§ÖÖʱ£¬¼´¿É¿ØÖÆReshapingºóÖ®Á£×Ó³¤¾¶±È¡£¶ø [HAuCl4]/[Au seed]֮Ũ¶È±ÈÒà»áÓ°ÏìARÖµ£¬Èçͼ3-3£¬ÓÉUV-Vis¹âÆ×¹Û²ì¿ÉµÃ£¬Ëæ×Å[HAuCl4]Ũ¶ÈÔö¼Óʱ£¬LSPRÎüÊÕ·åµÍ²¨³¤Òƶ¯£¬µ± R¨R13.7£¬LSPRÎüÊÕ·å»á±äµÃ½ÏÕ£¬Æä´ú±íÒâ˼ӦΪAu nanoparticleµÄÁ£¾¶´óС·Ö²¼½ÏΪһÖ¡£¶øËæ×ÅRÖµÌáÉý£¬Ò²ÓÐÖúÓÚARÖµµÃϽµ£¬¼´±íʾAuNRsÒÑReshpaingΪ°ËÃæÌå¡£ ![]() ͼ3-3. (a) UV-vis spectra of AuNRs used as seeds and after their growth with different amounts of HAuCl4 (R) as indicated. (b)¨C(g) TEM images of AuNRs used as seeds (b) and the final products obtained at different R values. From Foams to ¡°Dry Water¡±: Phase inversion of Particle-Stabilized Materials ´«Í³ÉϽåÓÉÁ£×ÓÎȶ¨µÄÈ齺£¨Particle-stabilized emulsions£©ÓÉoil-in-water¸Ä±äΪwater-in-oilµÄÏà×ªÒÆ£¨Phase Inversion£©ÊÇ¿ÉÒÔ´ïµ½µÄ£¬Ö÷Òª¿É·ÖΪÏÂÃæÁ½ÖÖ·½·¨£º (1) Transitional£ºÔڹ̶¨ÓÍÓëË®µÄ±ÈÀý£¨Oil : water ratio£©Ï£¬Ôö¼ÓÁ£×ÓµÄÊèË®ÐÔ£¨Hydrophobicity£©£» (2) Catastrophic£ºÔÚ²»¸Ä±äÁ£×ÓÊèË®ÐÔµÄ×´¿öÏ£¬Ôö¼ÓÓÍÓëË®µÄ±ÈÀý¡£ ![]() ͼ 6-1¡¢Dispersed systems prepared from fluid mixtures and colloidal particles. (a) for oil-water mixtures (upper), and for air-water mixtures (lower); (b) colored single water drops in air, stabilized by particles of PTFE (white), phthalocyanine blue B, DCDMS-coated silica (20% SiOH, transparent), and Hansa yellow 2GX70. Scale bar = 0.5¦Ìm. ¶ø´Ëƪ×÷ÕßBernard P. BinksÔòÊ×ÏÈÌá³öÁ£×ÓÎȶ¨µÄair-water½Ó¿Ú¼äµÄÏàת»»£¬ÊÇĿǰ½Ó¿Ú»îÐÔ¼Á·Ö×ÓÈÔÎÞ·¨´ïµ½µÄÄ¿±ê¡£ÂÛÎÄÖÐËùʹÓõÄÎȶ¨ÓõÄÄÎÃ×Á£×ÓΪ¾ÓÉ dichlorodimethylsilane£¨DCDMS£©ÊèË®´¦ÀíµÄfumed silica¡£×÷ÕßͬʱÀûÓÃÉÏÊöµÄtransitionalÓëcatastrophicµÄÏà×ªÒÆ·½·¨£¬¸Ä±äÎȶ¨Á£×ÓµÄÇ×ÊèË®ÐÔÒÔ¼°µ÷ÕûÈÜýµÄ±ÈÀý£¨air/water£©£¬¼´¿É½«air-in-waterµÄÅÝÄ£¨foams£©×ª»»Îªwater-in-airµÄ·ÛÄ©£¨powders£©£¬Èçͼ 6-1(A)Ëùʾ¡£ÕâÖÖÐÂÐ͵IJÄÁÏ£¬½åÓÉÉÏÊöµÄÔÀí¿ÉÒÔ½«¿ÕÆø»òÊÇË®°ü¸½ÔÚÁ£×ÓÖУ¬¿ÉÓ¦ÓÃÉúÒ½ÁìÓòÉÏµÄÆøÌå»òÊÇÒºÌå·Ö×ӵĿØÖÆÊÍ·Å¡£ ![]() ͼ6-2. Transitional inversion of the curvature of air-water surfaces with respect to particle hydrophobicity. Photograph of vessels containing 2wt% (relative to water) of DCDMS-coated silica particles withfw = 0.056 two weeks after mixing and aeration, for particles of different wettabilities ÉÌÆ·µÄsilicaÒò±íÃæÎªSiOH»ùÍŹÊΪÇ×Ë®ÐÔ£¬¶øÔÙtransitional inversion·½Ê½£¬±ÈÐè¸Ä±äÎȶ¨Á£×ÓµÄÇ×ÊèË®ÐÔ£¬×÷ÕßʹÓõķ½·¨ÎªsilicaÓëDCDMSÔÚË®Öз´Ó¦ÍÑÈ¥Ò»·Ö×ÓµÄHCl£¬¼´¿ÉµÃµ½±íÃæ´øÓÐ SiOSi(CH3)2ClµÄÊèË®»ùÍÅ¡£ÔÚÏàͬµÄair/water±ÈÀýÏ£¨fw = 0.056£©·Ö±ðÌí¼Ó²»Í¬SiOHº¬Á¿µÄDCDMS-coated silica particles£¨2wt%£©£¬¼´¿ÉµÃµ½Èçͼ6-2µÄaqueous dispersions£¨%SiOH = 66~100£©Ïàת±äΪair-in-water foams£¨%SiOH = 32~62£©ÔÙת±äΪwater-in-air powder£¨%SiOH = 14~20£©£¬´ËÏàת±äÓëSiOHµÄº¬Á¿Óйأ¨¼´Ç×ÊèË®ÐÔ£©£¬Òò´ËÆäÏàת±äµÄ½øÐз½Ïò²¢ÎÞÏÞÖÆ¡£ ![]() ͼ6-3. Catastrophic phase inversion of particle-stabililzed systems with respect to air / water ratio. Photograph of vessels containing 0.114 wt / vol% (relative to total volume) of DCDMS-coated silica particles possessing 14% SiOH, two weeks after mixing and aeration, for different initialfw. ͼ6-3ÔòΪÁíÒ»ÖÖÏàת±ä·½Ê½£¬catastrophic phase inversion£¬¹Ì¶¨µÄÇ×ÊèË®ÐÔ£¨%SiOH = 14£©£¬¸Ä±äair/waterÖ®±ÈÀý£¨fw = 0.056~0.95£©£¬Ò²¿ÉµÃµ½Óëtransition phase inversionÏà֮ͬ½á¹û¡£ ×÷ÕߣºÇñ¿¡Òã / ²Ä»¯Ëù ¡ï±¾ÎĽÚ¼×Ô²ÄÁÏÊÀ½çÍø¡¸²ÄÁÏ×îǰÏß¡¹×¨À¸£¬¸ü¶àÊý¾ÝÇë¼ûÏ·½¸½Îļþ¡£ µµ°¸ÏÂÔØ ![]() [ Last edited by dgf2008 on 2008-8-25 at 19:55 ] |
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