Investigation of the Structures of the Crystalline and Columnar Phases of Linear Chain Copper(II) Alkanoates

Abied, H.; Guillon, Daniel; Skoulios, A.; Weber, P.; Giroud‐Godquin, Anne‐Marie; Marchon, Jean‐Claude

doi:10.1080/02678298708086676

Cited by 107 publications

(26 citation statements)

References 15 publications

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“…4) appears in the DTA trace. It reminds of the oscillations observed upon heating Cu-dodecanoate [30] and some 8 Li alkanoates [31]. In the temperature interval situated between this oscillation and the onset of DTA peak III, the XRD patterns show the appearance and growth of a new broad reflection at 2θ = 3.8° and the collapse of the reflections present at lower temperatures (Fig.…”

Section: Resultsmentioning

confidence: 61%

Thermal decomposition of barium valerate in argon

Torres

Norby

Grivel

2015

Journal of Analytical and Applied Pyrolysis

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Section: Resultsmentioning

confidence: 61%

Thermal decomposition of barium valerate in argon

Torres

Norby

Grivel

2015

Journal of Analytical and Applied Pyrolysis

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“…The molecules studied ( Figure 2) include copper(II) dodecanoate (CuD), [28] hexa-n-pentyloxytriphenylene (HAT5), [29] and the polymer PTT n (average molecular weight M n = 35.2 kDa and polydispersity index = 1.1). [30] The experiments were performed as a function of temperature and the concentration of solute used, whether it was an alkane or triphenylene.…”

Section: Compoundsmentioning

confidence: 99%

“…[28] Consequently, pulling a thread naturally becomes easier as the nematic phase is not structured (Section 3.1). Moreover, in some cases the nature of the phases may be modified too.…”

Section: Solute Effectsmentioning

confidence: 99%

“…For instance, if loadings of 20 wt % squalane and more, are added to the CuD compound, the disordered columnar phase turns to a nematic phase. [28] Consequently, pulling a thread naturally becomes easier as the nematic phase is not structured (Section 3.1). However, even if the phase is not changed, pulling a strand is more or less difficult according to the nature of the added solute and to its concentration.…”

Section: Solute Effectsmentioning

confidence: 99%

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Elongation of Discotic Liquid Crystal Strands and Lubricant Effects

Bhattacharyya

Galerne

2013

ChemPhysChem

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After a short review on the physics of pulled threads and their mechanical properties, the paper reports and discusses the strand elongation of disordered columnar phases, hexagonal or lamella-columnar, of small molecules or polymers. The mechanical properties appear to be relevant to the length of the columns of molecules compared to the thread length, instead of the usual correlation length. If, taking the entanglement effect into account, the column length is short, the strand exhibits rather fluid-like properties that may even look nematic-like at the macroscopic scale. The Plateau-Rayleigh instability breaks the thread shortly thereafter. However, because the hydrodynamic objects are the columns instead of the molecules, the viscosity is anomalously large. The observations show that the strands in the columnar phases are made of filaments, or fibrils, which are bundles of columns of molecules. This explains the grooves and rings, which are observed on the antenna or bamboo-like strand profiles. On pulling a strand, the elongation stress eventually exceeds the plasticity threshold, thus breaking the columns and the filaments. As a result, cracks, more exactly, giant dislocations are formed. These change the strand thickness by steps of different birefringence colors. Interestingly, the addition of a solute may drastically change the effective viscosity of the columnar phase and its mechanical properties. Some solutes, such as alkanes, exhibit lubricant and detangling properties, whereas others such as triphenylene, are antilubricant.

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“…Среди комплексов c простыми лигандами представляют интерес соединения алкилкарбо-новых кислот. Карбоксилатная группа оказалась пригодна не только для введения щелочных и щелочноземельных металлов, а также кадмия в молекулу жидкого кристалла [45,46], но на основе карбоксилатных лигандов были также получены и охарактеризованы жидкокристаллические комп-лексы меди(II) [82,83]. На основе данных рентгеновской дифракции было установлено, что такие комплексы образуют «фонарную» структуру с двумя атомами металла и четырьмя лигандами, которые дают в итоге гексагональную колончатую упаковку (рис.…”

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