Thermodynamic properties of binary mixtures containing hydrofluoroether

Minamihounoki, Takashi; Takigawa, Takayo; Tamura, Katsutoshi; Murakami, Sachio

doi:10.1006/jcht.2000.0741

Cited by 25 publications

(21 citation statements)

References 10 publications

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“…Phase separation is observed in the mixtures with longer chain alcohols than propanol; {x nonafluorobutylmethylether + (1 − x) pentanol} is a typical example. (1) The curves of H E m are flattened due to concentration fluctuation approaching phase separation. Several parameters are necessary in order that the curve fits the points.…”

Section: Resultsmentioning

confidence: 98%

“…(5) The parameters A i and G are given in table 4, together with standard deviations s. The broken lines in figures 1 and 2 represent the {x nonafluorobutylmethylether + (1 − x) propanol} values previously reported (1) and are figure 1. Phase separation is observed in the mixtures with longer chain alcohols than propanol; {x nonafluorobutylmethylether + (1 − x) pentanol} is a typical example.…”

Section: Resultsmentioning

confidence: 99%

“…Excess enthalpies and excess volumes of {x nonafluorobutylmethylether + (1 − x) methanol or ethanol} were measured at T = 298.15 K in addition to {x nonafluorobutylmethylether + (1 − x) propanol, or pentanol} previously reported. (1) …”

Section: Introductionmentioning

confidence: 97%

“…(1) It was found that a phase separation occurs in the mixtures of this material + the longer alkane or alcohol, such as decane or butanol. The dependence on chain length of alcohol is discussed in more detail in this paper.…”

Section: Introductionmentioning

confidence: 98%

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Excess enthalpies and excess volumes of binary mixtures of hydrofluoroether with alcohols

Takigawa

Minamihounoki

Tamura

2002

The Journal of Chemical Thermodynamics

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Excess enthalpies and excess volumes of binary mixtures of hydrofluoroether with alcohols

Takigawa

Minamihounoki

Tamura

2002

The Journal of Chemical Thermodynamics

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“…The decrease in w AB is much larger than that in w BB because the stabilizing energy caused by the dispersive interaction between perfluoroalkyl and alkyl chains is larger than that between the perfluoroalkyl chains. [12] Considering also that the decrease in w BB is only half as effective as the decrease in w AB , increasing perfluoroalkyl chain length decreases the contribution of line tension, resulting in a decrease in domain size. A similar explanation can also be applied to the effect of n. Variations in the structures of FmHnA in the region of 4 ≤ m ≤ 10 and 6 ≤ n ≤ 12 show that nanostructures form in the mixed LB films of H17A and FmHnA when (m + n) ≥ 16 except for F6H10A.…”

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confidence: 98%

Control of Two‐Dimensional Nanopatterns by Adjusting Intermolecular Interactions

et al. 2007

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Self-assembly enables exquisite control over the structures of various materials such as ultrathin organic films, [1][2][3][4] polymer films, [5][6][7] and inorganic nanoparticle assemblies. [8] Organic molecules are particularly suited for exploiting self-assembly because of the controllability of their molecular properties and intermolecular interactions using molecular design. Lateral patterning of organic materials has been performed using both top-down [6,9] and bottom-up [1][2][3][4][5]7] methods. However, construction of controllable nanostructures consisting of small organic molecules is difficult using bottom-up methods. In this Communication, we show that by using self-assembly, ultrathin films of small organic molecules are patterned with nanostructures, the sizes of which are controlled by adjusting intermolecular interactions. We demonstrate the formation of nanowires of controllable widths in phase-separated mixed monolayers. Organic and inorganic materials can be confined on the templates fabricated from phase-separated monolayers. Further, we report on the formation of spirals in threecomponent monolayers. We used the Langmuir-Blodgett (LB) technique for the fabrication of controlled nanostructures. Phase separation often occurs in mixed-Langmuir and LB films, the structures of which are governed by two competing interactions of line tension and dipole-dipole interactions. [1,3,10] Line tension favors the formation of large circular domains. Dipole-dipole interactions in monolayers is repulsive because each molecule is aligned in a parallel manner. Systematic variations in one of the interactions without changing the other should provide us with a means to control the phase-separated structures in monolayers. Along this line, we examined the phase-separated structures of two-component mixed LB films of fatty acid C k H 2k+1 COOH (HkA) and hybrid carboxylic acid C m F 2m+1 C n H 2n COOH (FmHnA), with systematic variations in k, m, and n. Dipoles that contribute dominantly to the phase-separated structures are those located at both ends of the molecules: [11] those due to methyl and carboxylic groups of HkA and those due to perfluoromethyl and carboxylic groups of FmHnA. Variations in alkyl and perfluoroalkyl chain lengths should not significantly affect the vertical component of the above dipoles as long as the molecular arrangement remains unchanged. Under these conditions, variations in the structures of the hydrophobic moieties of the molecules significantly affect only the line tension and not the dipole-dipole interactions. Figure 1 shows the change in the phase-separated structures of two-component LB films of H17A and FmH8A. Friction force microscopic observations show that the high and low parts consist of H17A and FmH8A, respectively. Circular domains of micrometer length scale form when m is small, showing the dominant role of line tension. In contrast, nanowires form when m is large, indicating the effect of dipole-dipole interactions.

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Analysis of the intermolecular interaction between CH₃OCH₃, CF₃OCH₃, CF₃OCF₃, and CH₄: High levelab initiocalculations

et al. 2002

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The intermolecular interaction energies of the CH(3)OCH(3)-CH(4), CF(3)OCH(3)-CH(4), and CF(3)OCF(3)-CH(4) systems were calculated by ab initio molecular orbital method with the electron correlation correction at the second order Møller-Plesset perturbation (MP2) method. The interaction energies of 10 orientations of complexes were calculated for each system. The largest interaction energies calculated for the three systems are -1.06, -0.70, and -0.80 kcal/mol, respectively. The inclusion of electron correlation increases the attraction significantly. It gains the attraction -1.47, -1.19, and -1.27 kcal/mol, respectively. The dispersion interaction is found to be the major source of the attraction in these systems. In the CH(3)OCH(3)-CH(4) system, the electrostatic interaction (-0.34 kcal/mol) increases the attraction substantially, while the electrostatic energies in the other systems are not large. Fluorine substitution of the ether decreases the electrostatic interaction, and therefore, decreases the attraction. In addition the orientation dependence of the interaction energy is decreased by the substitution.

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Thermodynamic properties of binary mixtures containing hydrofluoroether

Cited by 25 publications

References 10 publications

Excess enthalpies and excess volumes of binary mixtures of hydrofluoroether with alcohols

Excess enthalpies and excess volumes of binary mixtures of hydrofluoroether with alcohols

Control of Two‐Dimensional Nanopatterns by Adjusting Intermolecular Interactions

Analysis of the intermolecular interaction between CH₃OCH₃, CF₃OCH₃, CF₃OCF₃, and CH₄: High levelab initiocalculations

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Thermodynamic properties of binary mixtures containing hydrofluoroether

Cited by 25 publications

References 10 publications

Excess enthalpies and excess volumes of binary mixtures of hydrofluoroether with alcohols

Excess enthalpies and excess volumes of binary mixtures of hydrofluoroether with alcohols

Control of Two‐Dimensional Nanopatterns by Adjusting Intermolecular Interactions

Analysis of the intermolecular interaction between CH3OCH3, CF3OCH3, CF3OCF3, and CH4: High levelab initiocalculations

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Analysis of the intermolecular interaction between CH₃OCH₃, CF₃OCH₃, CF₃OCF₃, and CH₄: High levelab initiocalculations