Metastable rotator phase

Author: qeiq

August undefined, 2024

Web2 aug. 2015 · C16 in the large pores of CPG (300 nm) only shows a triclinic phase. In the pores of diameters d = 7.8–17.2 nm, C16 exhibits stable or metastable rotator phase RI … WebThis experimental fact reflects the metastable nature of the rotator phase in C20 and explains why the rotator phase cannot be observed in a heating run starting from …

Phase transitions and flux-loop metastable states in rotating …

WebWe find rotator-phase nucleation is indeed favored throughout the temperature range where nucleation is observed. Our methods can be extended to other polymers. … Web1 dec. 2000 · A transient metastable rotator phase occurs on crystallization of n-alkanes into their triclinic crystalline phase from the supercooled melt. This was directly observed … eric swalwell farter

Supercooling suppression of microencapsulated phase change m

Web24 apr. 1998 · We demonstrate the relation between supercooling of n-alkane melts and the appearance or nonappearance of rotator phases. Supercooling occurs for the shorter, … Web1 aug. 2024 · In a crystalline rotator phase, molecules have long – range positional order in a lamellar structure and they rotate or oscillate around their long axes [31]. The rotator phases can be stable, metastable and transient where stable rotator phases form in alkanes with odd numbers of C-atoms and even-numbered alkanes (n ≥ 22) [32]. eric swalwell first wife\\u0027s name

Transient Phase-Induced Nucleation Science

Rotator phases in alkane systems: In bulk, surface layers

WebPhD-FSTC-2015-11 The Faculty of Sciences, Technology and Communication DISSERTATION Defense held on 11/03/2015 in Luxembourg to obtain the degree of DOCTEUR DE L’UNIVERSITÉ DU WebThis experimental fact reflects the metastable nature of the rotator phase in C20 and explains why the rotator phase cannot be observed in a heating run starting from the triclinic phase, which is the thermodynamic reference phase at lower temperatures. eric swalwell feng fengWeb5 jul. 2024 · In the emulsions exhibiting drop self-shaping, the scattering spectra reveal the formation of intermediate, metastable rotator phases in the alkane drops before their … eric swalwell election

"Web4 jul. 2006 · As evident from the DSC measurement, a surface freezing monolayer, which is formed in the microcapsules before the bulk crystallization, induces a novel metastable … " - Metastable rotator phase

Metastable rotator phase

Rotator phases and nucleation in polyethylene - NASA/ADS

Web1 jan. 2014 · The rotator phases of alkanes are often observed in confined geometry such as microcapsules, which are weakly-ordered crystalline phases that lack long-range order with respect to rotation about the long axis of the molecule [17], [32], [33], [34], [35]. WebA new metastable rotator phase (RII) absent in the bulk state, has been detected for the n -alkane mixture in confined geometry under all the investigated compositions.

Did you know?

WebA new metastable rotator phase (RII) absent in the bulk state, has been detected for the n-alkane mixture in confined geometry under all the investigated compositions. Such a … Web15 jan. 2024 · From the patterns of the pure n-octadecane, there was triclinic crystal phase found. The peaks occurred at 2θ = 11.49°, 15.3°, 19.2°, 19.8°, 23.4°, 24.7°, 34.7°, 39.6° and 44.4°, represents (003), (004), (010), (011), (100), (111), (−110), (0–202) and (207) planes, respectively [ 31 ].

Web1 jul. 2024 · Rotator phases occur between the liquid and crystalline phases in alkanes. Molecules have partial mobility so that these phases are soft-solid materials. Mixing and … Web22 jul. 2015 · In the emulsions exhibiting drop self-shaping, the scattering spectra reveal the formation of intermediate, metastable rotator phases in the alkane drops before their …

Web12 okt. 2024 · By using direct numerical simulations of up to a resolution of 512 × 512 × 32 768 grid points we discover the existence of a metastable out-of-equilibrium state in … Web22 jan. 1999 · Materials often crystallize into metastable forms when cooling from the melt. Once formed, a metastable phase may remain stable indefinitely even for very large …

Web6 aug. 2015 · We present relaxations in the metastable rotator phase of the n-alkane eicosane (C20H42). The relaxation times found by calorimetry increase with increasing temperature on approaching the melting...

Web14 jun. 2011 · Normal alkanes display multiple ordered phases, including an orthorhombic crystal (X) and two partially ordered rotator phases (RI and RII). The rotator phase transitions X-RI and RI-RII are of interest because they are weakly first-order, and because experiments suggest that crystalline polyethylene may nucleate via a metastable rotator … eric swalwell dublin officeWebRecent work on crystallization of polyethylene (PE) implicates a metastable rotator phase as the nucleating phase. This claim invites the questions: what is the structure of this phase, what is the free energy difference δF driving nucleation, and what is the surface free energy σ of the phase in contact with the melt? Related proposals for critical nuclei in … find the bitwise or of 101 1110 and 010 0001Web1 apr. 2024 · Metastable supercooled liquids are extremely vulnerable to impurities and external disturbances. They are favourably disposed towards stable condition through forming a new phase. Thus, capability of a reliable nucleation when releasing the latent heat is very important [19]. eric swalwell first marriageWeb22 jan. 1999 · A transient metastable rotator phase occurring on crystallization of hexadecane into its triclinic phase from the supercooled melt was directly observed with … eric swalwell first wifeWebNormal alkanes display multiple ordered phases, including an orthorhombic crystal (X) and two partially ordered rotator phases (RI and RII). The rotator phase transitions X-RI and RI-RII are of interest because they are weakly first-order, and because experiments suggest that crystalline polyethylene may nucleate via a metastable rotator phase. find the bitwise of the bit string 1001 111Web15 dec. 2024 · Rotator phases in hexadecane emulsion drops revealed by X-ray synchrotron techniques J Colloid Interface Sci. 2024 Dec 15;604:260-271. doi: … eric swalwell homeWeb5 jul. 2024 · In the emulsions exhibiting drop self-shaping, the scattering spectra reveal the formation of intermediate, metastable rotator phases in the alkane drops before their crystallization. In addition, shells of rotator phase were observed to form in hexadecane drops, stabilized by C16EO10 surfactant. find the bitwise xor of 50 49