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Structure, Dynamics, Phase Behavior and Applications of the Complex Disordered Systems

A special issue of Entropy (ISSN 1099-4300). This special issue belongs to the section "Complexity".

Deadline for manuscript submissions: closed (31 January 2026) | Viewed by 1064

Special Issue Editors


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Guest Editor
School of Physics and Astronomy, Beijing Normal University, Beijing 100875, China
Interests: phase transition; critical phenomena; crystallization; glass transition; liquid’s anomalies; statistical physics; complex system; disordered system

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Guest Editor
Computational Soft Matter Lab, The Hong Kong University of Science and Technology (Guangzhou), Guangzhou 511453, China
Interests: electrostatic and hydrodynamic effects in soft matter; phase separation in polymer and polyelectrolyte systems; self-assembly of colloids and nanoparticles Monte Carlo and molecular dynamics simulation; development of machine learning force fields
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Special Issue Information

Dear Colleagues,

In recent years, researchers have made significant strides in establishing theoretical frameworks within solid-state physics, particularly focusing on crystalline structures. However, disordered systems—such as liquids, liquid crystals, glasses, polymers, active matter, biological systems, and climate systems—are far more prevalent in both nature and daily life. The interconnectedness and nonlinearity inherent in these complex disordered systems can lead to unexpected phenomena, highlighting the complexity and unpredictability that characterize them. This makes understanding these systems crucial for realistic modeling and practical applications.

A central challenge in studying complex disordered systems lies in accurately describing their structures and the ways in which they evolve under varying conditions. Many aspects of this evolution remain difficult to identify and poorly understood. Furthermore, the interplay of structural, dynamical, and thermodynamical properties is still an area of active research. The origins of the anomalous behaviors exhibited by substances such as water, silica, and gallium continue to generate considerable debate.

This Special Issue invites submissions that address the structure, dynamics, phase behavior, and applications of complex systems. Topics of interest include the mechanisms of crystallization and glass transition, the dynamical and mechanical properties of complex systems, liquid–liquid phase transitions, and the two-state model. The development of new theoretical/experimental tools for disordered systems is also of interest for this topic. We welcome a diverse range of contributions, including comprehensive reviews and original papers that span theoretical insights, experimental studies, simulations, and data exploration.

Prof. Dr. Gang Sun
Dr. Jiaxing Yuan
Guest Editors

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • liquid
  • glass
  • phase transition
  • critical phenomena
  • crystallization
  • glass transition
  • liquid–liquid phase transition
  • phase separation
  • electrostatic interactions
  • hydrodynamics
  • self-organization
  • dynamics of macromolecular systems
  • rheology behaviors

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Published Papers (2 papers)

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Research

13 pages, 2717 KB  
Article
Confinement-Tunable Spatial Distribution of Physisorbed Hydrogen in Defective Carbon Nanotube Bundles
by Shuming Yang, Kun Qiu, Gang Sun and Huaze Shen
Entropy 2026, 28(4), 415; https://doi.org/10.3390/e28040415 - 7 Apr 2026
Viewed by 315
Abstract
Spatial confinement strongly affects matter by altering structural stability, relaxation times, and equilibrium properties. Interest in hydrogen storage within carbon nanotube bundles has grown because it addresses practical energy needs while revealing rich confined-fluid physics. Understanding how geometry and defects influence hydrogen structure [...] Read more.
Spatial confinement strongly affects matter by altering structural stability, relaxation times, and equilibrium properties. Interest in hydrogen storage within carbon nanotube bundles has grown because it addresses practical energy needs while revealing rich confined-fluid physics. Understanding how geometry and defects influence hydrogen structure and dynamics is essential to the development of effective storage materials. Here, we investigate how confinement in single-walled carbon nanotube (SWCNT) bundles with vacancies alters the spatial distribution and phase behavior of physisorbed hydrogen. At low temperature, hydrogen forms solid-like, cylindrical layered structures both inside and outside the tubes. Raising the temperature broadens these layers and produces a liquid-like arrangement within the confined regions. This confined solid-to-liquid crossover controls storage capacity and release behavior and can be tuned by temperature, confinement dimensions, and vacancy defects. Full article
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15 pages, 3643 KB  
Article
Disorder-Assisted Adiabaticity in Correlated Many-Particle Systems
by Shang-Jie Liou and Herbert F. Fotso
Entropy 2026, 28(3), 327; https://doi.org/10.3390/e28030327 - 14 Mar 2026
Viewed by 273
Abstract
We investigate how disorder affects adiabaticity in an interacting quantum system by assessing its effect on the state of the system after an interaction modulation, or interaction “pulse”, whereby the interaction is changed from zero to a maximum value and then back to [...] Read more.
We investigate how disorder affects adiabaticity in an interacting quantum system by assessing its effect on the state of the system after an interaction modulation, or interaction “pulse”, whereby the interaction is changed from zero to a maximum value and then back to zero following a given time profile. We find that, independently of the disorder strength and pulse shapes (rectangular, triangular, and Gaussian), the pulse duration is negatively correlated with the change in total energy in the system. That is, a longer duration reduces the change in total energy for each protocol. Most importantly, across different considered pulse shapes, we find a robust negative correlation between the disorder strength and the change in total energy across the interaction pulse. Namely, increasing the disorder strength systematically suppresses the residual energy added to the system after the interaction pulse, indicating a more adiabatic response. These two effects, disorder-induced and duration-induced adiabaticity, are consistently observed across all three pulse shapes. Among the protocols, the triangular pulse yields the smallest change in total energy in the system over comparable conditions, demonstrating the most adiabatic response. In addition to the energy analysis, we also examine how disorder modifies the effective temperature change across the interaction pulse, to further establish a quantitative relation between disorder and the thermal response. Altogether, our results identify disorder as a key factor in both the energy and the temperature variation over the time-modulation of the interaction. Full article
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