浓度C/(mol·L -1)去离子水 2.52
1.2510.6250.50.25Δh m1/mmH 2O -44.5-35.8-39.5-43.8-46.4-50.1-5
2.2-56.1Δh m2/mmH 2O -44.6-35.7-38.9-4
3.9-46.7-49.9-51.9-56.3Δh m3/mmH 2O
-45.1
-36.1
-39.4
-44.4-46.9-50.4-52.4-56.7Δh m /mmH 2O -44.73-35.87-39.27-44.03-46.67-50.13-52.17-56.37表面张力σ/(mN/m)72.7058.2963.8271.5675.8481.4884.7891.61d σ/dC -8.15-9.72-13.8-16.05-21.22-23.81-30.93Z 20.375019.440017.250016.050013.262511.90507.7325Γ0.008390.008010.007100.006610.005460.00490#######C/Γ297.912249.792
175.941
151.276
114.419
101.973
78.499
姓名:汪彪 学校:华南理工大学学院:化学与化工 专业:11级能源工程及自动化
用Origin非线性拟合
556065707580859095mol /L
σ/
用Origin求作一阶微分图
d
Independent Variable
d σΓ
由图算得斜率k=96.24 所以Γ∞=1/k=0.01039
由图得出截距为50 所以b=1/(Γ∞*50)=k/50=1.9248
A=1/(Γ
∞L)=1.599×10
-22m
2
0.5 1.0 1.5 2.0 2.5
C/mol/L
C/
c/mol/L