journal article·2020-02-01Open access

Molecular relaxations in supercooled liquid and glassy states of amorphous gambogic acid: Dielectric spectroscopy, calorimetry, and theoretical approach

Anh D. Phan, Tran Thi Thu Thuy, Nguyen Thi Kim An, Justyna Knapik-Kowalczuk, Marian Paluch, Katsunori Wakabayashi

AIP Advances· Volume 10· Issue 2

Abstract

The relaxation dynamics and thermodynamic properties of supercooled and glassy gambogic acid are investigated using both theory and experiment. We measure the temperature dependence of the relaxation times in three polymorphs (α-, β-, and γ-form). To gain insight into the relaxation processes, we propose a theoretical approach to quantitatively understand the nature of these three relaxations. The α-relaxation captures cooperative motions of molecules, while the β-process is mainly governed by the local dynamics of a single molecule within the cage formed by its nearest neighbors. Based on quantitative agreement between theory and experimental data, our calculations clearly indicate that the β-process is a precursor of the structural relaxation and intramolecular motions are responsible for the γ-relaxation. Moreover, the approach is exploited to study the effects of the heating process on alpha relaxation. We find that the heating rate varies logarithmically with Tg and 1000/Tg. These variations are qualitatively consistent with many prior studies.
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Research context

OpenAlex topics: Material Dynamics and Properties · Thermodynamic properties of mixtures · Surfactants and Colloidal Systems

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Artificial Intelligence Laboratory, Faculty of Materials Science and Engineering, Phenikaa Institute for Advanced Study and Faculty of Information Technology, Phenikaa University 1 , Hanoi 12116, Vietnam

Department of Nanotechnology for Sustainable Energy, School of Science and Technology, Kwansei Gakuin University 2 , Sanda, Hyogo 669-1337, Japan

Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology 3 , 18 Hoang Quoc Viet, Hanoi 12116, Vietnam

Faculty of Chemical Technology, Hanoi University of Industry 4 , 298 Cau Dien Street, North Tu Liem District, Hanoi 12116, Vietnam

Vietnam Academy of Science and Technology, Graduate University of Science and Technology 5 , 18 Hoang Quoc Viet, Hanoi 12116, Vietnam

Institute of Physics, University of Silesia, SMCEBI 6 , 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland

Funding

The National Science Center, Poland · Ministry of Industry and Trade · The Vietnam National Foundation for Science and Technology Development · JSPS KAKENHI

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