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hf1987(½ð±Ò+3): 2010-10-22 16:56:34
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ÔÙ½â´ðµÚ¶þ¸öÎÊÌâ°É BJH·¨Ê¹ÓõĻù±¾·½³ÌÊÇKelvin·½³Ì The method was proposed by Barrer, Joiyner and Halenda. It is designed as ASTM(American Society for Testing Materials) standard method It is widely used also by commercial instruments to perform calculation on mesopores The Kelvin equation can be used to evaluate the pore width from the pore filling pressure. Using the equation, by examining step by step the isotherm in the range 0.42 BJH-pore-size distributions in the small mesopore to large micropore region should be interpreted with caution because the Kelvin equation (basis of BJH) is reliable only for pores >2 nm. Ò»°ãÇé¿öÏ£¬¿×¾¶¼ÆËãÓ¦¸Ã²ÉÓÃÍѸ½Ö§Êý¾Ý¡£ ¢Ù¶ÔÓÚÀíÏëµÄÁ½¶Ë¿ª¿ÚµÄԲͲÐοף¬Îü¸½Ö§ºÍÍѸ½Ö§Öغϣ» ¢Ú¶ÔÓÚÁ½¶Ë¿ª¿ÚµÄÔ²ÖùÐοף¬Îü¸½Ö§¶ÔÓ¦µÄÍäÒºÃæÇúÂÊÊÇÔ²ÖùÃæ£¬¶øÍѸ½Ö§¶ÔÓ¦µÄ²ÅÊÇÔڿ׿ڴ¦ÐγɵÄÇòÐÎÍäÒºÃæ£» ¢Ûƽ°å¿×ºÍÓÉÆ¬×´Á£×ÓÐγɵÄÏÁ·ìÐοף¬Îü¸½Ê±²»·¢ÉúëϸÄý¾Û£¬¶øÍѸ½Ö§Êý¾Ý²Å·´Ó³ÕæÊµµÄ¿×϶ ¢Ü¶ÔÓÚ¿ÚС¸¹´óµÄ¡°Ä«Ë®Æ¿¡±¿×µÈ´øÓÐÑʺí¿×¿ÚµÄ¿×£¬Îü¸½ÊÇÒ»¸ö¿×¿ÕÇ»ÄÚÖð½¥ÌîÂúµÄ¹ý³Ì£¬¸ù¾ÝÎü¸½Ö§Êý¾Ý¿ÉµÃµ½¿ÕÇ»ÄڵĿ׾¶·Ö²¼£¬µ«ÊÇÍѸ½Ö§ÄÜ·´Ó³ºí²¿µÄ¿×¾¶¡£ ¶ø¶à¿×´ß»¯¼ÁµÄÄÚÀ©É¢ËÙÂÊǡǡÊDZ»¿×µÀ×îÕµÄºí²¿³ß´çÏÞÖÆ£¬¶ø²»ÊÇÀ©Õ¹µÄ¿ÕÇ»³ß´ç¡£ ÍѸ½Ö§Êǿ״óС¸üºÃµÄ¶ÈÁ¿¡£ ÌØ±ðÊǵ±½»Ö¯µÄ¿×½á¹¹¾ßÓм¸ÌõƽÐеĺí¹Üʱ£¬ÍѸ½Ö§·´Ó³µÄÊÇÆäÖÐ×î´ÖµÄºí¹Ü³ß´ç£¬¶øÕâÇ¡ºÃÓÖÄÜÕýÈ·µØ·´Ó³¿×½á¹¹¶Ô´ß»¯¼ÁÄÚÀ©É¢µÄÏÞÖÆ×÷Óᣠ¢ÝÎü¸½Ê±£¬ÔÚëϸÄý¾Ûǰ¿ÉÄÜÐèÒªÒ»¶¨³Ì¶ÈµÄ¹ý±¥ºÍ£¬Kelvin ¹«Ê½Ëù¼Ù¶¨µÄÈÈÁ¦Ñ§Æ½ºâ¿ÉÄÜ´ï²»µ½¡£ »¹ÓÐÍѸ½Ê±Ã«Ï¸¿×ÄÚµÄÄý¾ÛÒºÓëÒºÌå±¾ÌåÐÔÖʽӽü£¬¶øÎü¸½Ê±£¬ÎïÀíÁ¦£¨ÌرðÊǵÚÒ»²ã£©ÓëÒºÌå±¾Ìå·Ö×Ó¼äÁ¦²»Ò»Ñù£¬Õâʱ Kelvin ¹«Ê½Ê¹ÓÃÒºÌå±¾Ìå±íÃæÕÅÁ¦ÓëÒºÌåµÄĦ¶ûÌå»ý±È½ÏÃãÇ¿¡£ |

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