CAJ | 학술논문

利用Gibbs吸附公式,通过测量溶液浓度和表面张力可以计算最大吸附量时表面活性剂的表面吸附量,进而计算得到每个分子所占有的表面积;通过与分子本身大小比较能够推测出分子在表面的吸附状态.本文利用文献值,通过计算得出常见的离子型、非离子型及Gemini型表面活性剂在CMC时的平均分子占有面积,同时将具有表面活性的丁醇一并比较.结果发现,各类分子在表面的占有面积为头基的1～2倍,紧密程度为Gemini型>离子型>丁醇>非离子型;同类型之间,支链较多且取代基分子量较大时排列疏松.同时,温度对其影响也进行了对比分析.
이용Gibbs흡부공식,통과측량용액농도화표면장력가이계산최대흡부량시표면활성제적표면흡부량,진이계산득도매개분자소점유적표면적;통과여분자본신대소비교능구추측출분자재표면적흡부상태.본문이용문헌치,통과계산득출상견적리자형、비리자형급Gemini형표면활성제재CMC시적평균분자점유면적,동시장구유표면활성적정순일병비교.결과발현,각류분자재표면적점유면적위두기적1～2배,긴밀정도위Gemini형>리자형>정순>비리자형;동류형지간,지련교다차취대기분자량교대시배렬소송.동시,온도대기영향야진행료대비분석.
Using the Gibbs-adsorption theory,surfactant area of every molecular at the critical micelle concentration(CMC) were calculated by measuring surface tension and solution concentration.Therefore,the molecular aggregation state at the air-liquid interface can be speculated by comparing with the truth value.In this article,we figured out the area of some molecule including ion-surfactant,nonion-surfactant,and Gemini-surfactant at CMC,furthermore,the adsorption structure of butanol was studied.The results show that the surfactant molecules almost array one by one at the interface.The aggregation degree was as following:Gemini>ionic surfactant>butanol>nonionic surfactant,respectively;among the homologous compound,the bigger molecule having more branch chains were arrayed loosely.The effect of temperature was also analyzed.