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ID:52311524
大小:1.98 MB
页数:62页
时间:2020-03-26
《胶体成核的临界条件.pdf》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、分类号鲤垒!学校代码】Q曼垒至密级学号至鲤璺!!Q至QQ墨Q胶体成核的临界条件TheitilconditionsofCO110idaCrcaCOndIltlItIlIlInucIeation研究生姓名赵丹丹指剥磁~职称肖长明教授学科专业研究方向理论物理.--0——年五月胶体是一种非常重要的软物质,对我们的生活有很重要的意义,有着非常广泛的应用前景。鉴于胶体体系的复杂性,对该体系的深入研究有助于改善胶体的结构,提高其性能。在本文中,我们根据熵的最大值原理和CS状态方程,分别研究了单元与双元硬球胶体系统中胶体团簇成核的临界条件,其中包括临界体积分量与胶体团簇
2、成核的临界尺寸之间的关系,并取得了很好的结果:1、在单元硬球胶体系统中,对于FCC结构,发现当I/<0.4958时,方程没有解,此时的胶球团簇不可能长成核,更不可能出现相变。这与实验测定的相变的临近体积分量0.495相一致。2、在双元硬球胶体系统中,①根据方程计算所得的团簇成核的临界体积分量与对应的实验值很好地吻合;②研究发现大小胶球直径的比值对胶球团簇成核临晁尺寸与临界体积分量的影响,我们发现比值越大团簇成核的临界体积的分量越小;此外,研究结果还显示,大球的浓度对团簇成核的临界体积分量和临界尺寸有影响。关键词:胶体;排空作用;熵;成核堆积Abstrac
3、tColloldisakindofsoftmatterwhichisveryimportanttoourlife.Obviously,ithasaverywidespreadapplicationprospect.Asthecolloidalsystemisverycomplex,adeepstudyonitisneeded.Inthispaper,accordingtotheprincipleofentropymaximumandtheCarnahan—Starling(CS)stateequation,wehavestudiedthecritical
4、nucleationconditionsoftheunitandthebinaryhard—spherescolloidalsystems,includingtherelationshipofthecriticalvolumefractionandthesizeforacolloidalclustertonucleate.Fortheunithard-spherecolloidalsystem,wemainlystudiedtheFCCstructure,andthenumericalresultsshowsthatwhen刀5、tionhasnosolution.Therefore,thecolloidalclustercannotgrow,andthephasetransitioncannotturnoutwhen11<0.4958.Infact,experimentalmeasurementsshowthecriticalvolumefractiondenotingphasetransitionfromthecolloidalfluidtoaphaseoffluid—crystalcoexistenceis0.495,obviouslyourresultsareingood6、agreementwiththeexperiments.Secondly,forthebinarycolloidalsystemsconsidered.Inthispaper,thecriticalvolumefractionsdeterminedbynumericalcalculationarealsoingoodagreementwiththeexperiments.Inaddition,fromthenumericalresults,wefindthatthecriticalvolumefractionofnucleationiSaffectedb7、yboththeconcentrationoflarge—’sphereandthesizeratiooflarge—tosmal1一sphere.Keywords:colloid;depletioneffect:entropy;nucleationpacking.II目录摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯IAbstract⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯.][][第一章绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11.1软物质⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯8、⋯⋯⋯⋯.11.1.1引言⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯
5、tionhasnosolution.Therefore,thecolloidalclustercannotgrow,andthephasetransitioncannotturnoutwhen11<0.4958.Infact,experimentalmeasurementsshowthecriticalvolumefractiondenotingphasetransitionfromthecolloidalfluidtoaphaseoffluid—crystalcoexistenceis0.495,obviouslyourresultsareingood
6、agreementwiththeexperiments.Secondly,forthebinarycolloidalsystemsconsidered.Inthispaper,thecriticalvolumefractionsdeterminedbynumericalcalculationarealsoingoodagreementwiththeexperiments.Inaddition,fromthenumericalresults,wefindthatthecriticalvolumefractionofnucleationiSaffectedb
7、yboththeconcentrationoflarge—’sphereandthesizeratiooflarge—tosmal1一sphere.Keywords:colloid;depletioneffect:entropy;nucleationpacking.II目录摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯IAbstract⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯.][][第一章绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11.1软物质⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯
8、⋯⋯⋯⋯.11.1.1引言⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯
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