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mophyworld

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[½»Á÷] ¡¾ÇóÖú¡¿ReaxFF Á¦³¡²ÎÊý»¯ÎÊÌâÇë½Ì

ÒÔÏÂÊÇÒý×ÔSimulations on the Thermal Decomposition of a Poly(dimethylsiloxane) Polymer Using the ReaxFF Reactive Force Field£¬J. AM. CHEM. SOC. 2005, 127, 7192-7202µÄÒ»¸öƬ¶Î£¬ÊǹØÓÚReaxFFÁ¦³¡²ÎÊý»¯µÄ˵Ã÷£¬²»ÖªµÀ¾ßÌåÊÇÔõôִÐеģ¬Ï£ÍûÓÐÈË¿ÉÒÔÒ»Æð̽ÌÖÏ¡£

The force field was constructed by adding quantum chemical (QC) data for systems relevant to PDMS chemistry to the ReaxFF training set for Si/SiO materials. QC data for nonperiodic systems was obtained from DFT calculations performed using Jaguar (version 5.5) using the B3LYP functional and Pople¡¯s 6-311G**++ basis set.22 The Mulliken charges were obtain using Pople¡¯s 6-31G** basis set. To obtain the equation of state for disiloxane diol (HOMe2Si)2O crystal, DFT calculations were performed with the plane-wave code CASTEP (version 3.8) module in Cerius2. The generalized gradient approximation (GGA) proposed by Perdew, Burke, and Ernzerhof was used for the exchange-correlation energy, and ultrasoft pseudopotentials were used to replace the core electrons. We used the Perdew-Wang implementation of GGA with a kinetic energy cutoff of 380 eV. The Monkhorst-Pack scheme was used to generate the k-space grid with a 0.1 Å-1 spacing

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qphll

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mophyworld(½ð±Ò+10): O(¡É_¡É)Oлл£¡ 2011-05-19 09:48:50
heyo_123(½ð±Ò+12): »Ø´ðÎÊÌ⣬LZ£¨mophyworld£©À¡Ôù£¡ 2011-05-20 15:39:34
ÄãÕâÀïÌáµ½µÄϸ½Ú, ¶¼ÊÇÁ¿»¯¼ÆËãµÄ, ÑϸñÒâÒåÉϽ²ºÍReaxFFÁ¦³¡²ÎÊý»¯µÄ¾ßÌåϸ½Ú²½Öèûɶ¹Øϵ.ºÜÃ÷ÏÔReaxFFµÄ²ÎÊý¶¼ÊÇÔÚÁ¿»¯Êý¾ÝµÄ»ù´¡ÉÏfitµÃµ½µÄ. Ä¿Ç°, ²ÅѵÁ·²ÎÊýµÄʱºò, ¿ÉÒÔÓÐÕâÑùµÄ¼¸ÀàÐÅÏ¢¿ÉÒÔʹÓÃ:

Frequency, charge, heat_of_formation, geometry, cell parameter, energy_difference

ÕâÆäÖÐenergy_differenceʹÓõÃ×î¶à.

Èç¹ûÄãÓÃÁ¿»¯¼ÆËãÁË·´Ó¦Îï, ·´Ó¦²úÎï, ÄÇôÄã¾Í¿ÉÒԵõ½energy_difference.ÕâÑùÒ»À´, ¶ÔÓÚѵÁ·²ÎÊýµÄÊý¾Ý¿â¶øÑÔ, ¾ÍÓÖÔö¼ÓÁËÒ»¸ötarget.

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2Â¥2011-05-17 15:11:32
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mophyworld

½ð³æ (ÕýʽдÊÖ)


ÒýÓûØÌû:
Originally posted by qphll at 2011-05-17 15:11:32:
ÄãÕâÀïÌáµ½µÄϸ½Ú, ¶¼ÊÇÁ¿»¯¼ÆËãµÄ, ÑϸñÒâÒåÉϽ²ºÍReaxFFÁ¦³¡²ÎÊý»¯µÄ¾ßÌåϸ½Ú²½Öèûɶ¹Øϵ.ºÜÃ÷ÏÔReaxFFµÄ²ÎÊý¶¼ÊÇÔÚÁ¿»¯Êý¾ÝµÄ»ù´¡ÉÏfitµÃµ½µÄ. Ä¿Ç°, ²ÅѵÁ·²ÎÊýµÄʱºò, ¿ÉÒÔÓÐÕâÑùµÄ¼¸ÀàÐÅÏ¢¿ÉÒÔʹÓÃ:

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3Â¥2011-05-19 09:52:05
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qphll

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Originally posted by mophyworld at 2011-05-19 09:52:05:
²»ÖªµÀÄúÊÇ·ñ×ö¹ýÕâ·½ÃæµÄÏà¹Ø¹¤×÷£¬»¹ÓиöÎÊÌâÇë½Ì£ºÔÚReaxFFµÄÖÚ¶à²ÎÊýÖУ¬Èçcovalent radius¡¢vdw radius¡¢electronegativity¡¢hardnessµÈ»ù´¡²ÎÊýÊÇ·ñÊÇÔÚÆäËû²ÎÊý»¯¹¤×÷֮ǰÍê³ÉµÄ£¬»¹ÊǸúÆäËû²ÎÊýÒ»ÆðÄâ ...

Äã˵µ½µÄÕâЩ, ¿ÉÒÔËã×÷ÊÇGeneral parameter, »òÕßÊǵÚÒ»Ààatom based patameter,  Èç¹ûÊÇȫеÄÌåϵ, ÄÇÊÇÒªÊ×ÏÈÈ·¶¨ÏÂÀ´µÄ. ²»¹ý¾ø´ó¶àÊýµÄÇé¿öÏÂ, ÓÅ»¯¶àÊÇÕë¶ÔÔ­×Ó¼äµÄÏ໥×÷ÓÃ, ±ÈÈ罡³¤, ¼ü½ÇÀ´ÓÅ»¯µÄ.
4Â¥2011-05-19 11:19:30
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mophyworld

½ð³æ (ÕýʽдÊÖ)


ÒýÓûØÌû:
Originally posted by qphll at 2011-05-19 11:19:30:
Äã˵µ½µÄÕâЩ, ¿ÉÒÔËã×÷ÊÇGeneral parameter, »òÕßÊǵÚÒ»Ààatom based patameter,  Èç¹ûÊÇȫеÄÌåϵ, ÄÇÊÇÒªÊ×ÏÈÈ·¶¨ÏÂÀ´µÄ. ²»¹ý¾ø´ó¶àÊýµÄÇé¿öÏÂ, ÓÅ»¯¶àÊÇÕë¶ÔÔ­×Ó¼äµÄÏ໥×÷ÓÃ, ±ÈÈ罡³¤, ¼ü½ÇÀ´ÓÅ»¯µÄ.

»¹ÓиöÎÊÌâÇë½Ì£¬¶ÔÓÚ²»Í¬µÄÁ¦³¡£¬µç¸ºÐÔ¼°Ó²¶ÈµÈgeneral parametersÊÇ·ñ¾ßÓпÉÒÆÖ²ÐÔÄØ£¿

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5Â¥2011-05-20 09:16:34
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qphll

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Originally posted by mophyworld at 2011-05-20 09:16:34:
»¹ÓиöÎÊÌâÇë½Ì£¬¶ÔÓÚ²»Í¬µÄÁ¦³¡£¬µç¸ºÐÔ¼°Ó²¶ÈµÈgeneral parametersÊÇ·ñ¾ßÓпÉÒÆÖ²ÐÔÄØ£¿

¶ÔÓÚReaxFF±¾Éí£¬ÎҲο´ÁËËüÃÇÄâºÏ³öÀ´µÄÁ¦³¡Îļþ£¬²¢½«ËüÓëÎﻯÊÖ²á½øÐÐÁ˱Ƚϣ¬·¢ÏÖ¸ÃÁ¦³¡ÄâºÏ³öÀ´µÄ¹²¼Û°ë¾¶Êý ...

àÅ, ºÜÔÞÄãÕâÑùµÄÑϽ÷̬¶È.

ÎҲ鿴ÁËÒ»ÏÂReaxFFµÄtrain set, ÄÇÀïÓÐÕâÑù¼¸Àà:
Frequency
Charge
Heat_of_Formation
Geometry
Cell_Parameter
Energy_Difference

¾ÍÏñÎÒÇ°Ãæ˵µÄ, ÏÖÔÚµÄReaxFFµÄ²ÎÊý, ¶àÊDZȽÏÄÜÁ¿²î±ð, ±È½ÏNEBµÃµ½µÄ¸÷¸öimageµÄÄÜÁ¿²î, ±È½Ïenergy barrier, ¶ø´ïµ½²ÎÊýÓÅ»¯. ÎÒµÄÀí½âÊÇ, ¶àÊýµÄÓÅ»¯, ÊÇÔÚÇ°ÃæÒÑÓеIJÎÊýÖµµÄ»ù´¡ÉϵÄ. ËùÒÔÕâ¸öʱºò, General²ÎÊý, »ù±¾¾Í²»È¥±ä¶¯ÁË.

Èç¹ûÊÇÒ»¸öеÄÌåϵ? ÄǾͺÜÂé·³. µÃÒª´óÁ¿µÄÁ¿»¯ÐÅÏ¢, ²¢Í¬Ê±¶Ô¶à¸öÄ¿±ê²ÎÊý½øÐÐÓÅ»¯.


¹ØÓÚÄãÌáµ½µÄ¼¸¸öÎÊÌâ, µç¸ºÐÔ¼°Ó²¶È, ÎÒµÄÀí½âÊÇ, ËüÃÇ°üÀ¨ÔÚCharge, Heat_of_Formation, ºÍCell PatameterÀïÃæÁË; VDW²ÎÊýÒ²ÊÇÈç´Ë.

ÄãµÄ±È½Ï·¢ÏÖÎÊÌâ, ²»´ú±íÄãµÄÀí½âÊDz»¶ÔµÄ, ÕâÕýÊÇÁ¦³¡µÄ'ÕÛÖÔ'´øÀ´µÄÎÊÌâ. ReaxFF±¾ÉíµÄ˼ÏëûÓÐÎÊÌâ, »òÕßÎÒ¿ÉÒÔ˵Á¦³¡µÄ²ÎÊýҲûÓÐÎÊÌâ. Ö»ÒªÄãÃ÷°×, ReaxFFÊÇÒÔÓÐÏÞµÄÁ¿»¯Êý¾Ý, ÊýÖµÄâºÏ³öÀ´µÄ. ËäÈ»ËüµÄ¹«Ê½±¾ÉíµÄÍƵ¼ÓÐÒ»¶¨µÄÎïÀíÒâÒå, µ«ÊDzÎÊýtrainµÄ±¾Éí, ÆäʵÊÇÒ»¸ö´¿ÊýѧµÄ¹ý³Ì. Æä½á¹ûÒ²Ö»¶ÔËüµÄtrain set¸ºÔð, ÉõÖÁÒ»ÑùµÄÌåϵ, Èç¹ûÓÐT,P±ä»¯, »òÕßÍⳡ¼ÓÈë, ¶¼²»Ò»¶¨Äܱ£Ö¤ÍêÈ«¿É¿¿µÄ.

ÄÇô¶ÔÓÚ¾ßÌåµÄ²ÎÊý, ±ÈÈç, ÎÒÃÇ¿ÉÒÔ´ÓReaxFFÀïÃæÖ±½Ó½«VDW²ÎÊý, »òÕß½«ChargeÖ±½ÓÄÃÀ´, ·Åµ½ÆäËûµØ·½È¥×öMD, »òÕßMCÂð? ÎÒ¾õµÃÕâÑù×öÊDz»¿ÉÈ¡µÄ, ÄÇÑùµÄ²ÎÊý, Ö»ÓÐÔÚ ReaxFFÕâÑùµÄ»·¾³Ï²ÅÓÐÒâÒå, µ¥¶ÀÄóöÀ´, ÎÒ¾õµÃ¾Í²»¶ÔÁË.

ÁíÍâ, Èç¹ûÄã¹ØÐÄÒ»ÏÂÓà ReaxFF·¢µÄÎÄÕÂ, ÔÚÁ¦³¡¿ÉÐÅÐÔÆÀ¹ÀÄÇÒ»¿é, ´ó¼ÒµÄ²àÖØ»¹ÊÇÔÚÄÜÁ¿µÄ±È½ÏÄÇÒ»¿é. Õâ±¾Éí¾ÍÊÇÒ»¸ötricky, ÒÔÄÜÁ¿Îª²Î¿¼Ì¬À´ÑµÁ·, È»ºóÓÖÒÔ´ËÀ´×÷ΪԤ²â¾«È·µÄÅоÝ...

²»¹ÜÔõÑù, ÎÒ¾õµÃÈç¹ûÄãÏëÒªÓà ReaxFF, Ã÷°×һЩËüµÄ²ÎÊýÊÇÔõôѵÁ·³öÀ´µÄ, »¹ÊǺÜÓбØÒªµÄ. Õâ´óÖÂÒ²ÄÜÈÃÄã¹À¼ÆÒ»ÏÂÄãµÄ½á¹ûµÄ¿ÉÐŶȷ¶Î§.
6Â¥2011-05-20 12:28:02
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mophyworld

½ð³æ (ÕýʽдÊÖ)


ÒýÓûØÌû:
Originally posted by qphll at 2011-05-20 12:28:02:
àÅ, ºÜÔÞÄãÕâÑùµÄÑϽ÷̬¶È.

ÎҲ鿴ÁËÒ»ÏÂReaxFFµÄtrain set, ÄÇÀïÓÐÕâÑù¼¸Àà:
Frequency
Charge
Heat_of_Formation
Geometry
Cell_Parameter
Energy_Difference

¾ÍÏñÎÒÇ°Ãæ˵µÄ, ÏÖÔÚµÄReaxFFµÄ²Î ...

O(¡É_¡É)O·Ç³£¸ÐлÄúµÄ°ïÖú£¬ÓкóÐøÎÊÌâÔÙÏòÄúÇë½Ì£¡
7Â¥2011-05-20 15:29:24
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qphll

½ð³æ (ÕýʽдÊÖ)


ÒýÓûØÌû:
Originally posted by mophyworld at 2011-05-20 15:29:24:
O(¡É_¡É)O·Ç³£¸ÐлÄúµÄ°ïÖú£¬ÓкóÐøÎÊÌâÔÙÏòÄúÇë½Ì£¡

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8Â¥2011-05-20 20:22:51
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liu1102yuan

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