Binary phase diagram of the system: n-docosane-n-tricosane

Nouar, H.; Petitjean, D.; Bouroukba, M.; Dirand, M.

doi:10.1016/s0022-2860(97)00385-2

Cited by 19 publications

(19 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The C19 + C20 phase diagram is very similar to the C17 + C18 diagram, 22 monoclinic phase (this was confirmed by our study of the C23 + C25 17 and C25 + C27 systems, where M dci is stable for C25 and C27). The C23 + C24 system ( Figure 1) has also been studied by Nouar et al 8 Their phase diagram and ours are fairly similar; two differences can be noticed, however. The first is related to the [RI + RII] equilibrium.…”

Section: Materials and Experimental Sectionsupporting

confidence: 75%

“…Mixing of n-alkanes generally has a dramatic influence on the polymorphic relationships, in particular, when even (n in Cn is even) alkanes are mixed with odd alkanes. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] In previous papers we have reported on the phase behavior of a number of individual binary systems. [16][17][18][19][20] For these systems all mixed phases were characterized as to their crystallographic properties.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

n-Alkane Binary Molecular Alloys

et al. 2004

View full text Add to dashboard Cite

The experimental systems considered in this paper are normal alkanes, in the range from octane to octacosane; and their binary mixtures {(1-x) mol of CnH2n+2 + x mol of Cn′H2n′+2}, with n′ > n, and ∆n ) n′ -n taking the values 1 and 2. The alkanes and their mixtures have a rich, complex polymorphic nature, for the description of which a distinction is made between a high-temperature and a low-temperature domain. The high-temperature domain is occupied by rotator phases, and the low-temperature domain by a variety of mixed crystalline phases, referred to as the "ordered" phases. Experimental phase diagram data for 19 binariessincluding 11 binaries for which original data are presentedsare used to give a uniform and coherent description of the phase relationships for the ensemble of alkane alloys.

show abstract

Section: Materials and Experimental Sectionsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

n-Alkane Binary Molecular Alloys

et al. 2004

View full text Add to dashboard Cite

show abstract

“…For the spectrum of the neat docosane, the signals can be attributed to the triclinic phase of solid docosane, stable up to approx. 40 °C [52,53]. This phase is characterized by the spatial group normalPtrue1¯, generally indicated as γ 0 (C22), with cell parameters a = 4.2805 Å, b = 4.8212 Å, c = 28.2877 Å, α = 91.14°, β = 94.63°, γ = 106.39°.…”

Section: Resultsmentioning

confidence: 99%

Docosane-Organosilica Microcapsules for Structural Composites with Thermal Energy Storage/Release Capability

et al. 2019

View full text Add to dashboard Cite

Organic phase change materials (PCMs) represent an effective solution to manage intermittent energy sources as the solar thermal energy. This work aims at encapsulating docosane in organosilica shells and at dispersing the produced capsules in epoxy/carbon laminates to manufacture multifunctional structural composites for thermal energy storage (TES). Microcapsules of different sizes were prepared by hydrolysis-condensation of methyltriethoxysilane (MTES) in an oil-in-water emulsion. X-ray diffraction (XRD) highlighted the difference in the crystalline structure of pristine and microencapsulated docosane, and 13C solid-state nuclear magnetic resonance (NMR) evidenced the influence of microcapsules size on the shifts of the representative docosane signals, as a consequence of confinement effects, i.e., reduced chain mobility and interaction with the inner shell walls. A phase change enthalpy up to 143 J/g was determined via differential scanning calorimetry (DSC) on microcapsules, and tests at low scanning speed emphasized the differences in the crystallization behavior and allowed the calculation of the phase change activation energy of docosane, which increased upon encapsulation. Then, the possibility of embedding the microcapsules in an epoxy resin and in an epoxy/carbon laminate to produce a structural TES composite was investigated. The presence of microcapsules agglomerates and the poor capsule-epoxy adhesion, both evidenced by scanning electron microscopy (SEM), led to a decrease in the mechanical properties, as confirmed by three-point bending tests. Dynamic mechanical analysis (DMA) highlighted that the storage modulus decreased by 15% after docosane melting and that the glass transition temperature of the epoxy resin was not influenced by the PCM. The heat storage/release properties of the obtained laminates were proved through DSC and thermal camera imaging tests.

show abstract

“…The structural behavior of ternary mixtures ( was determined in the isothermal section at 293 K [4]: this study indicates the existence of limited terminal solid solutions close to the three pure nalkanes (here after denoted by C,) and three domains of intermediate solid solutions, identical to those observed in the binary systems and called pi, p;, /3y (Fig. 5a).…”

Section: Introductionmentioning

confidence: 75%

Isothermal Sections of Ternary Mixtures: n-docosane + n-tricosane + n-tetracosane

Nouar

Petitjean

Bouroukba

et al. 1999

Molecular Crystals and Liquid Crystals Science and Technology.

Self Cite

View full text Add to dashboard Cite

The crystallographic long c parameter of the binary and ternary f l , f12, f l , intermediate solid solutions (n-C22H46 + n-C23H48 + n-CZ4H5,,) is approximately equal to the average c parameter of mixture equivalent orthorhombic pure n-alkanes: this finding shows that the longer n-alkane chain is not straight in unit cell of the mixture, but flexible near the chain end, as earlier observed from spectroscopy analyses by other authors. Four ternary isothermal sections were determined at 305K, 308K, 311 K and 313K from binary diagram data and differential scanning calorimetry and X-ray diffraction analyses of thirty ternary mixtures: the ternary intermediate solid solutions undergo the same first-order solid -solid eqyilibrium transitions as those of binary alloys with the observation of p(Fmmm)-RI and (r(R3m)-RII Rotator states below the solidus point.

show abstract

Binary phase diagram of the system: n-docosane-n-tricosane

Cited by 19 publications

References 19 publications

n-Alkane Binary Molecular Alloys

n-Alkane Binary Molecular Alloys

Docosane-Organosilica Microcapsules for Structural Composites with Thermal Energy Storage/Release Capability

Isothermal Sections of Ternary Mixtures: n-docosane + n-tricosane + n-tetracosane

Contact Info

Product

Resources

About