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[1]Carboxylation treatment of multiwalled carbon nanotubes monitored by infrared and ultraviolet spectroscopies and scanning probe microscopy ʹÓÃAFM¡¢FTIR¡¢UV/VisÀ´·ÖÎöºÍÑо¿»ìºÏŨÏõËáŨÁòËá´¦ÀíºóMWNTµÄÐÎ̬¼°´¦ÀíµÄЧ¹û¡£ [2]Analyzing the quality of carbon nanotube dispersions in polymers using scanning electron microscopy ¿´ÌâÄ¿¾ÍÖªµÀÁ˰ɣ¡SEM¹Û²ìCNTÔÚ»ùÌåÖеķÖÉ¢Çé¿ö¡£ÎÄÕÂÀïÃæ½éÉܵıȽÏÏêϸ¡£ [3]Influence of dispersion states of carbon nanotubes on physical properties of epoxy nanocomposites ¸ÃÎĽéÉÜÁËCNT²»Í¬·ÖÉ¢³Ì¶È¶Ô»·ÑõÊ÷Ö¬¸´ºÏ²ÄÁϵÄÁ÷±äѧ¡¢»úеÐÔÄÜ¡¢µ¼µçÐÔ¡¢ÈÈÐÔÄܵÄÓ°Ïì¡£ÓÃFESEMºÍTEM±íÕ÷ÁËCNTµÄ·ÖÉ¢Çé¿ö¡£¡£¡£¡£ [4]General Strategies for Nanoparticle Dispersion ·¢±íÔÚScience 2006Äê3.24 VOL311 ÉϵÄһƪÎÄÕ£¬ÎÒ»¹Ã»À´µÃ¼°¿´¡£°ÑÕªÒªÌûÉÏÀ´£¬´ó¼Ò×Ô¼º¿´°É¡£ Traditionally the dispersion of particles in polymeric materials has proven difficult and frequently results in phase separation and agglomeration. We show that thermodynamically stable dispersion of nanoparticles into a polymeric liquid is enhanced for systems where the radius of gyration of the linear polymer is greater than the radius of the nanoparticle. Dispersed nanoparticles swell the linear polymer chains, resulting in a polymer radius of gyration that grows with the nanoparticle volume fraction. It is proposed that this entropically unfavorable process is offset by an enthalpy gain due to an increase in molecular contacts at dispersed nanoparticle surfaces as compared with the surfaces of phase-separated nanoparticles. Even when the dispersed state is thermodynamically stable, it may be inaccessible unless the correct processing strategy is adopted, which is particularly important for the case of fullerene dispersion into linear polymers. [ Last edited by gshsheng on 2009-6-20 at 13:20 ] |
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