Phase separation behavior of (palmitic acid/lignoceric acid) mixed monolayer based on a π-A isotherm measurement and a scanning probe microscopic observation

被引:8
作者
Kuramori, M [1 ]
Uchida, N [1 ]
Suehiro, K [1 ]
Oishi, Y [1 ]
机构
[1] Saga Univ, Fac Sci & Engn, Dept Appl Chem, Saga 8408502, Japan
关键词
D O I
10.1246/bcsj.73.829
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The aggregation state of a mixed monolayer of palmitic acid (C-16) and lignoceric acid (C-24) was investigated on the basis of a pi-A isotherm measurement and a scanning probe microscopic observation. The independence of the plateau and collapse pressures on the monolayer composition and the additivity of the average molecular area exhibited that the C-16, and C24 molecules were immiscible in the monolayer, indirectly suggesting the presence of phase-separated domains in the system. Two kinds of regions with different heights were apparently observed on an atomic force microscope image of the mixed monolayers. The change in the area fraction with the composition, the film thickness and the difference in the lateral force of the two regions revealed that the (C-16/C-24) mixed monolayer was in a phase-separated state. This phase separation is probably due to an enthalpic contribution based on the difference in cohesive energy of each alkyl chain.
引用
收藏
页码:829 / 835
页数:7
相关论文
共 55 条
[1]   PRESSURE-COMPOSITION PHASE-DIAGRAMS OF CHOLESTEROL-LECITHIN, CHOLESTEROL-PHOSPHATIDIC ACID, AND LECITHIN-PHOSPHATIDIC ACID MIXED MONOLAYERS - A LANGMUIR FILM BALANCE STUDY [J].
ALBRECHT, O ;
GRULER, H ;
SACKMANN, E .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1981, 79 (02) :319-338
[2]   Equilibrium surface properties of lipid mixtures of retinal, phosphatidylcholine and fatty acid derivatives at the air/water interface [J].
Angelova, A ;
De Coninck, J ;
Ionov, R .
SUPRAMOLECULAR SCIENCE, 1997, 4 (3-4) :207-214
[3]   MISCIBILITY OF ALKANOIC AND OMEGA-ANTHRYLALKANOIC ACIDS IN MONOLAYERS AT THE AIR/WATER INTERFACE STUDIED BY MEANS OF BREWSTER-ANGLE MICROSCOPY [J].
ANGELOVA, A ;
VANDERAUWERAER, M ;
IONOV, R ;
VOLLHARDT, D ;
DESCHRYVER, FC .
LANGMUIR, 1995, 11 (08) :3167-3176
[4]   2-COMPONENT MONOLAYERS .4. EXCESS ENTHALPIES AND ENTROPIES OF MIXING IN OCTADECANOL-DOCOSYL SULFATE SYSTEM [J].
BACON, KJ ;
BARNES, GT .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1978, 67 (01) :70-77
[5]  
BOYD GE, 1958, J COLLOID SCI, V13, P275
[6]   A NEW REPRESENTATION OF CONDENSATION EFFECTS IN MIXED MONOLAYERS .I. FILMS OF ELAIDIC ACID AND CHOLESTEROL ON AQUEOUS GLYCEROL SUBSTRATES [J].
CADENHEAD, DA ;
DEMCHAK, RJ .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1969, 30 (01) :76-+
[7]   DOMAIN-STRUCTURES IN LANGMUIR-BLODGETT-FILMS INVESTIGATED BY ATOMIC FORCE MICROSCOPY [J].
CHI, LF ;
ANDERS, M ;
FUCHS, H ;
JOHNSTON, RR ;
RINGSDORF, H .
SCIENCE, 1993, 259 (5092) :213-216
[8]   2-COMPONENT MONOLAYERS .3. EVAPORATION RESISTANCES OF OCTADECANOL-DOCOSYL SULFATE SYSTEM [J].
COSTIN, IS ;
BARNES, GT .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1975, 51 (01) :122-132
[9]   2-COMPONENT MONOLAYERS .2. SURFACE PRESSURE-AREA RELATIONS FOR OCTADECANOL-DOCOSYL SULFATE SYSTEM [J].
COSTIN, IS ;
BARNES, GT .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1975, 51 (01) :106-121
[10]  
DEBERNARD L, 1958, B SOC CHIM BIOL, V40, P161