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Phase transition and domain morphology in Langmuir monolayers of a calix[4]arene derivative containing no alkyl chain
He, WJ; Vollhardt, D; Rudert, R; Zhu, LG; Li, JB
2003-01-21
Source PublicationLANGMUIR
ISSN0743-7463
Volume19Issue:2Pages:385-392
AbstractThe monolayer features of 5,11,17,23-tetra-tert-butyl-25,27-di(benzoylamidoethoxy)-26,28-dihydroxyl calix[4]arene (DBAC) at the air/water interface are experimentally studied. Using combined studies of surface pressure-area (pi-A) isotherms, surface pressure relaxation, and monolayer morphology by Brewster angle microscopy (BAM), it is demonstrated that this calix[4]arene type, having no long alkyl chain, nevertheless, can form stable Langmuir monolayers. The pi-A isotherms show a pronounced plateau region between similar to90 and similar to60 Angstrom(2)/molecule after a linear increase of surface pressure. A first-order phase transition in the monolayer state takes place in the linear part of the pressure increase of the pi-A isotherm for 5 degreesC less than or equal to T less than or equal to 25 degreesC clearly indicated at 5 degreesC by a small inflection region between 102 and 99 Angstrom(2)/molecule and the simultaneous formation of condensed phase domains. The differences of the densities of the coexisting fluid and condensed phase are small. Temperature increase reduces the tendency to form the quasi-crystalline condensed monolayer phase. The relaxation studies reveal that the DBAC monolayers are not in equilibrium under the conditions of compression/decompression at which the. pi-A isotherms were recorded. The corresponding BAM,1 studies provide the exact area value for the onset of the two-dimensional phase transition. Under these conditions well-shaped manolayered dendritic structures are formed. The pronounced plateau region of the compression/decompression isotherm between similar to90 and similar to60 Angstrom(2)/molecule represents the transition from a tightly packed monolayer to a bilayer/multilayer structure. Possible conformers of the DBAC molecule were calculated by structure optimization using force field Tripos 5.2. The dimensions calculated for the conformer with the low cross-sectional area are in reasonable agreement with the features of the monolayer obtained by the surface pressure and BAM studies.
DOI10.1021/la020714i
Indexed BySCI
Language英语
WOS IDWOS:000180519200027
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/80562
Collection中国科学院化学研究所
Corresponding AuthorVollhardt, D
Affiliation1.Max Planck Inst Colloids & Interfaces, D-14424 Potsdam, Germany
2.Nanjing Univ, State Key Lab Coordinat Chem, Nanjing 210093, Peoples R China
3.Fed Inst Mat Res & Testing, D-12200 Berlin, Germany
4.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Int Joint Lab, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
He, WJ,Vollhardt, D,Rudert, R,et al. Phase transition and domain morphology in Langmuir monolayers of a calix[4]arene derivative containing no alkyl chain[J]. LANGMUIR,2003,19(2):385-392.
APA He, WJ,Vollhardt, D,Rudert, R,Zhu, LG,&Li, JB.(2003).Phase transition and domain morphology in Langmuir monolayers of a calix[4]arene derivative containing no alkyl chain.LANGMUIR,19(2),385-392.
MLA He, WJ,et al."Phase transition and domain morphology in Langmuir monolayers of a calix[4]arene derivative containing no alkyl chain".LANGMUIR 19.2(2003):385-392.
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