Nalazite se na CroRIS probnoj okolini. Ovdje evidentirani podaci neće biti pohranjeni u Informacijskom sustavu znanosti RH. Ako je ovo greška, CroRIS produkcijskoj okolini moguće je pristupi putem poveznice www.croris.hr
izvor podataka: crosbi !

Thermosalient effect - a study of N'-2-propylidene-4- hydroxybenzohydrazide (CROSBI ID 622004)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa

Skoko, Željko ; Popović, Jasminka ; Djerdj, igor Thermosalient effect - a study of N'-2-propylidene-4- hydroxybenzohydrazide // Synchrotron Radiation in Nanomaterials Research. 2014. str. 82-83

Podaci o odgovornosti

Skoko, Željko ; Popović, Jasminka ; Djerdj, igor

engleski

Thermosalient effect - a study of N'-2-propylidene-4- hydroxybenzohydrazide

Thermosalient materials, or colloquially commonly called “jumping crystals”, are promising materials for conversion of thermal (or light) energy to mechanical work on nanoscale [1]. These materials, when heated/cooled undergo a sudden and sharp polymorphic single crystal to single crystal phase transition. During this transition the crystals experience a change in their shape, as well as in the size of the unit-cell, and this change is so large that it causes them to jump up to height that is several times their size. This behaviour usually takes place in the time frame of several microseconds. Jumping crystals show high discontinuity in the change of the crystal lattice ; the change can be up to 12% [2]. It was reported [3] that N′-2-propylidene-4- hydroxybenzohydrazide shows behaviour somewhat similar to that of jumping crystal. This system was found in three polymorphic modifications (I, II and III), all having the same polar space group Pna21, with the phase transitions I to II, and III to II reported as topotactic (single crystal to single crystal). It was also reported that during irreversible phase transition from I to II, the polar axis undergoes a strong compression (approximately 15%) and single crystals of phase I are violently shuttered into single crystal fragments of the phase II (without jumping), while in the reversible phase transition III to II the polar axis expands (approximately 14%) and the integrity of the single crystals is preserved – and no movement of crystals is observed. Our measurements showed somewhat different behaviour – during the irreversible phase transition from I to II some of the crystals did indeed shutter into smaller fragments, but a large number remained intact and showed a typical jumping crystals behaviour – jumping all around over the large distances (several cm). This is typical of other thermosalient materials [1]. Also, during the reversible phase transition II <-> III (both ways) crystals exhibited jumping behaviour, alas somewhat weaker than during the phase transition I to II. This is in contrast to previously reported behaviour and the new model for jumping crystals phenomenon in this system has to be proposed. References: [1] Skoko, Ž., Zamir, S., Naumov, P. & Bernstein, J. (2010), J. Am. Chem. Soc. 132, 14191. [2] Steiner, T., Hinrichs, W. & Saenger, W. (1993), Acta Crystallogr. B49, 708. [3] Centore, R., Jazbinsek, M., Tuzi, A., Roviello, A., Capobianco, A. & Peluso, A. (2012) CrystEngComm 14, 2645.

thermosalient effect; x-ray diffraction; crystal structure

nije evidentirano

nije evidentirano

nije evidentirano

nije evidentirano

nije evidentirano

nije evidentirano

Podaci o prilogu

82-83.

2014.

objavljeno

Podaci o matičnoj publikaciji

Synchrotron Radiation in Nanomaterials Research

Podaci o skupu

Thermosalient effect - a study of N'-2-propylidene-4- hydroxybenzohydrazide

poster

15.11.2014-18.11.2014

Hurghada, Egipat

Povezanost rada

Fizika, Kemija