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Ðí¶à½ðÊô´ß»¯¼ÁÊÇÒÔÄÉÃ×Á£×Ó·½Ê½´æÔÚ¡£¶øÇÒÄÉÃ×Á£×ÓÒ²ÊÇÖÆ±¸ÄÉÃ׸´ºÏ²ÄÁϵÈÖ÷Òª×é³É²¿·Ö¡£Êµ¼ÊÓ¦ÓÃÖеÄÒ»¸öÄѵãÊÇÄÉÃ×Á£×ӵķÖÉ¢¡£ÕâÀïÏò´ó¼ÒÍÆ¼öһƪÕâ·½ÃæµÄÐÂÎÄÏ×£¬Ï£Íû¶ÔÄúÓвο¼¼ÛÖµ¡£ Reports General Strategies for Nanoparticle Dispersion Science 24 March 2006:£¬ Vol. 311. no. 5768, pp. 1740 - 1743 DOI: 10.1126/science.1122225 Michael E. Mackay,* Anish Tuteja, Phillip M. Duxbury, Craig J. Hawker, Brooke Van Horn, Zhibin Guan, Guanghui Chen, R. S. Krishnan 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. http://www.box.net/public/ar8bhl5thf Èç¹ûÒªÇó×¢²á£¬¿ÉÒÔÓÃÑûÇë http://www.box.net/signup/invitation/nanoquebec@gmail.com [ Last edited by rabbit7708 on 2007-4-18 at 15:56 ] |
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