Article
Physics, Multidisciplinary
Steven J. Large, David A. Sivak
Summary: Quantifying energy flow within fluctuating nanoscale systems is challenging, and coarse graining simplifies system description but introduces hidden contributions that complicate thermodynamics. A thermodynamically consistent theory for describing excess power in autonomous systems is developed, along with a phenomenological framework to quantify hidden excess power. The theoretical predictions are confirmed in numerical simulations of molecular transport and rotary motors.
Article
Physics, Multidisciplinary
Jiayin Gu, Fan Zhang
Summary: We applied tensor network algorithms to study the counting statistics of stochastic particle transport in a one-dimensional out-of-equilibrium diffusive system. The numerical results demonstrate the validity of these approaches by comparing the cumulant generating function for the current with the analytical solution. Furthermore, the fluctuation theorem for the current is shown to hold.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Eddy Collin, Ilya Golokolenov, Olivier Maillet, Laurent Saminadayar, Olivier Bourgeois
Summary: This study reports on the theoretical derivation of macroscopic thermal properties of an electrically insulating rod connected to two reservoirs. The theory predicts the temperature gradient and energy transport by linking motion amplitude cross-correlations between nearby mechanical modes. The theory relates the macroscopic clamping region where mixing occurs to the microscopic phonon mean-free-path.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
Matthew Gerry, Dvira Segal
Summary: Recently, a unified quantum master equation has been derived, which describes the dynamics of open quantum systems with coherences between nearly degenerate energy levels. The equation is shown to satisfy fluctuation symmetry and is thermodynamically consistent, making it more accurate than the fully secular master equation. Using this unified equation, the statistics of energy currents through open quantum systems have been investigated, and it has been found that maintaining coherences is essential in capturing the current and its cumulants.
Article
Physics, Multidisciplinary
Antonio Suma, Vincenzo Carnevale, Cristian Micheletti
Summary: Using theory and simulations, the authors studied DNA unzipping via nanopore translocation and found three dynamical regimes depending on the applied force. They showed that the normal regime can be modeled as a one-dimensional stochastic process and used the theory of stochastic processes to recover the free-energy landscape. This approach can be applied to other single-molecule systems with periodic potentials to obtain detailed free-energy landscapes from out-of-equilibrium trajectories.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Fluids & Plasmas
Masato Itami, Yohei Nakayama, Naoko Nakagawa, Shin-ichi Sasa
Summary: We studied the fluctuating dynamics of a freely movable piston separating an infinite cylinder filled with ideal gas particles at different temperatures. By perturbatively calculating the large deviation function of the time-averaged velocity, we derived an infinite number of effective Langevin equations yielding the same large deviation function as in the original model. Finally, we provided two possibilities for uniquely determining the form of the effective model.
Article
Chemistry, Multidisciplinary
Danila Boytsov, Stefania Brescia, Gustavo Chaves, Sabina Koefler, Christof Hannesschlaeger, Christine Siligan, Nikolaus Goessweiner-Mohr, Boris Musset, Peter Pohl
Summary: The voltage-gated proton channel, H(V)1, is essential for innate immune responses. It is uncertain whether protons move along a continuous water wire or bypass titratable amino acids halfway across the membrane. To investigate this, the water mobility for the uninterrupted water wire hypothesis was estimated. However, the measured water permeability did not support the predicted value. Osmotic deflation experiments showed minimal water permeability for the H(V)1 channel, indicating that the channel does not function as a water wire, and the presence of certain amino acids affects proton conductance.
Article
Engineering, Chemical
Yonghong Wang, Yi Zhou, Xinru Zhang, Yin Gao, Jinping Li
Summary: By incorporating microporous sodium zeoliteY (NaY) into sulfonated poly (ether ether ketone) (SPEEK), mixed-matrix membranes (MMMs) for CO2/N2 separation were successfully engineered with improved gas separation properties. The even distribution of NaY particles in the SPEEK matrix forming nanochannels enhanced CO2 permeability and selectivity, leading to superior separation performance compared to pristine SPEEK membranes.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Seung-Hyun Kim, Hong Suk Kang, Eun-Ho Sohn, Bong-Jun Chang, In Jun Park, Sang Goo Lee
Summary: This paper describes a method for fabricating core-shell particles using a gaseous fluorine precursor, resulting in particles with adjustable adhesive strength and raspberry-like shape, enabling control over superhydrophobicity and adhesive properties. The synthesized particles form a structured coating with controllable stickiness and contact angles, demonstrating stable behavior under different tilt angles and centrifugal forces based on the adhesivity of the surfaces.
Article
Physics, Fluids & Plasmas
Stefano Giordano
Summary: The study focuses on the relationship between stochastic thermodynamics and nonequilibrium thermodynamics through evaluating entropy production and the relationship between fluxes and forces in a harmonic system with N particles in contact with N different reservoirs. It identifies a linear relation between fluxes and forces satisfying Onsager reciprocity during the relaxation process to equilibrium, resulting in a nonlinear expression for entropy production. The entropic production turns into a quadratic form in the forces only when forces and fluxes are small, consistent with predictions from Onsager theory.
Article
Physics, Fluids & Plasmas
David Martin, Jeremy O'Byrne, Michael E. Cates, Etienne Fodor, Cesare Nardini, Julien Tailleur, Frederic van Wijland
Summary: We study the statistical properties of active Ornstein-Uhlenbeck particles (AOUPs), focusing on steady-state distribution, phase separation mechanisms, and entropy production. The results show deviation from thermal equilibrium limits and recovery of fluctuation-dissipation relations in the small persistence time limit.
Article
Multidisciplinary Sciences
Yoshimitsu Itoh, Shuo Chen, Ryota Hirahara, Takeshi Konda, Tsubasa Aoki, Takumi Ueda, Ichio Shimada, James J. Cannon, Cheng Shao, Junichiro Shiomi, Kazuhito Tabata, Hiroyuki Noji, Kohei Sato, Takuzo Aida
Summary: This study reports a novel fluorous nanochannel that exhibits a water permeation flux two orders of magnitude higher than that of aquaporins and carbon nanotubes. The hydrophobic interior surface of this nanochannel provides a powerful electrostatic barrier, resulting in nearly perfect salt reflectance. Hence, it holds significant potential for applications in desalination.
Article
Biochemistry & Molecular Biology
Hanggu Kim, Eunyoung Kim, Byoung-Cheol Lee
Summary: The N-terminus of TMEM16C determines its localization on the plasma membrane and affects its phospholipid scrambling activity. TMEM16C isoform 1 and isoform 3 transport phosphatidylserine to the cell surface, while isoform 2 does not possess this ability.
Review
Materials Science, Multidisciplinary
Minmin Li, Yuchen Cao, Yuting Xiong, Guangyan Qing
Summary: Biological ion channels have asymmetries in structure and charge distribution, which enable them to perform diverse activities such as signal transduction and cell motility. Inspired by this, researchers have been pursuing artificial ion channels with comparable functions. However, current homogeneous nanochannels have not been able to achieve similar rewards. Hierarchically engineered heterogeneous nanochannels, on the other hand, have shown promising properties such as ion selectivity and permeability, and have found applications in selective ion transport, energy conversion, biomolecular separation, and detection. In this article, recent advances in these hierarchically engineered nanochannel systems are reviewed, with a focus on pore-on-pore and pore-in-pore structures, and their potential applications are discussed.
NPG ASIA MATERIALS
(2023)
Article
Chemistry, Organic
Nyaya Prakash Pradhan, Kavthekar Rupesh Namdev, Aasheesh Srivastava
Summary: We designed bis(urea) functionalized molecular clips 1a-1e for efficient transmembrane co-transport of H+/Cl- ions. The most promising molecule 1a demonstrated a low nanomolar EC50 value (6.96 nM) for co-transporting H+/Cl- ions via a carrier-mediated pathway, and exhibited selective toxicity against cancerous HeLa cells.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2023)
