Article
Chemistry, Multidisciplinary
Anping Ji, Bo Wang, Guofeng Xia, Jinjie Luo, Zhenghua Deng
Summary: Experimental studies have shown that ion dynamics in single-digit nanopores of comparable dimensions to the Debye length deviate from bulk values, but there are still knowledge gaps in understanding ion transport in nanoconfinement. This study investigated the dynamics of monovalent ions in single-digit nanopores from the perspective of ionic conductance, providing a basic understanding and analysis of each conductance component.
Article
Materials Science, Multidisciplinary
Anupama Rao Gulur Srinivas, Rafiq Hilali, Mona Damavandi, Jenny Malmstrom, David Barker, Eva Weatherall, Geoff Willmott, Jadranka Travas-Sejdic
Summary: This study successfully achieved the functionalization of TPU tunable nanopores using a one-pot strategy, with grafting of negatively charged PAA brushes through the Graftfast method and demonstration of grafting of neutral brushes. The functionalization was characterized using various analytical methods, confirming the increase in negative surface charge on the pore walls.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Wanyi Xie, Shaoxi Fang, Bohua Yin, Rong Tian, Liyuan Liang, Shixuan He, Deqiang Wang
Summary: A single molecule detection technology based on glass nanopore was established to analyze xylan dissolved in ionic liquid. The results showed that the modified nanopore had stronger interaction with heterogeneous xylan, and the nanopore detection technology could show the structural difference of heterogenous branched chain and homogeneous straight chain, providing a research basis for the structural analysis of water insoluble polysaccharides.
CHINESE JOURNAL OF CHEMISTRY
(2023)
Article
Electrochemistry
Sokhna Mery Ngom, Isabelle Le Potier, Anne-Marie Haghiri-Gosnet, Jean Gamby
Summary: The aim of this study is to gain a better understanding of conductance changes in nanoslit integrated in a microchip device, by conducting experiments and modeling in hybrid micro nano microchannels. Three models were discussed to analyze the factors influencing conductance, leading to the discovery of a micromolar concentration zone where the inverse Duhkin number reaches minimum values, highlighting the importance of nanoslits in electro-preconcentration protocol.
ELECTROCHIMICA ACTA
(2021)
Article
Mechanics
Mohammad Tajparast, Mladen I. Glavinovic
Summary: Understanding the physics of water movement through a nanopore with an object is critical for better control of water flow and object translocation. We found that the external electric field, ion concentration, pore wall charge density, disk characteristics, and ion mobility all have an influence on the water flow in a charged cylindrical nanopore. The axial flow velocity and direction are mainly controlled by the external electric field, while the pore wall charges indirectly affect the flow by altering the distribution of mobile charges. Higher ion concentration enhances axial water flow, while ion mobility and disk characteristics have a minor influence.
Article
Chemistry, Physical
Juan Bisquert
Summary: Brain-inspired neuromorphic computing, which focuses on the development of artificial neurons and synapses, is an important area of research for effective artificial intelligence systems. This study proposes a minimal configuration for an iontronic spiking neuron based on a conical nanofluidic pore ionic diode, providing an effective approach for creating efficient neuromorphic networks.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Wei-Kuan Yen, Jyh-Ping Hsu
Summary: A continuum model is used to investigate the electrokinetic behavior of a pH-regulated cylindrical nanopore with charge-regulated carboxyl groups. The influence of nanopore length and permittivity on nanopore conductance is complex, with different behaviors observed based on the specific conditions. The effect of membrane polarization is significant only at low bulk salt concentrations.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Fiach Antaw, Will Anderson, Alain Wuethrich, Matt Trau
Summary: Recent advances in solid-state and biological nanopore sensors have led to a variety of techniques for in situ characterization of bio-nano colloidal dispersions, but the transport forces governing particle movement are not fully understood. A study on particle motion outside the nanopore opening, utilizing optoelectronic approach, showed that electrophoresis can dominate bulk fluid flow-driven motion in certain circumstances. This method allows direct observation of fluid behavior at the nanopore interface, providing a better understanding of transport forces acting on particles.
Article
Chemistry, Physical
Yue-Ting Chen, Jyh-Ping Hsu
Summary: Nanofluidic devices have various potential applications, with particular focus on pressure-driven power generation and ion separation for desalination. By adjusting the surface charge density of cylindrical nanopores and applying a sufficient pressure difference, the performance of the devices can be significantly improved while addressing the trade-off between rejection and flow rate.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Multidisciplinary Sciences
J. Nakamura, S. Liang, G. C. Gardner, M. J. Manfra
Summary: This study experimentally verifies the importance of quantum Hall interferometers in studying fractional statistics, and estimates the effects of electrostatic parameters on interferometer behavior using two methods. The results show that these electrostatic parameters can account for the observed phase jumps and Aharonov-Bohm oscillations in the experiment.
NATURE COMMUNICATIONS
(2022)
Article
Biochemistry & Molecular Biology
Lijun He, Zhiyang Xie, Xing Long, Zhaopeng Zhang, Fei Qi, Nan Zhang
Summary: DNA drug molecules play a crucial role in gene therapy and molecular electronics. This study investigates the impact of drug-DNA interactions on charge transport properties using density functional theory calculations. The results show that the conductance of DNA can be regulated by different drug molecules or by switching the interaction modes, opening up new possibilities for controlling the electron transport property of DNA.
HUMAN MOLECULAR GENETICS
(2023)
Article
Thermodynamics
Chu-Yao Chou, Chuanhua Duan
Summary: Understanding the fundamentals of kinetically-limited water evaporation in nanopores is crucial for improving the performance of thermal management devices. The effect of surface charges on nanopore evaporation was studied, and it was found that surface charge density, pore radius, wall temperature, and ambient air humidity play key roles in determining the overall performance. This study provides new insights into nanoscale phase-change heat transfer and is applicable to intensive evaporation applications.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Mechanics
Doyel Pandey, Somnath Bhattacharyya
Summary: The ion current rectification (ICR) in geometrically asymmetric nanopores due to finite size of ions and dielectric decrement leads to counterion saturation, which attenuates the surface charge shielding effect, resulting in larger zeta-potential, volume flux, and reduced conduction. Ion steric interactions and dielectric decrement significantly influence the ICR phenomena and ion selectivity of conical nanopores, especially for moderate to high surface charge density, bulk concentration, and applied bias. The variation of ICR with temperature is found to be marginal, and the volume flux and rectification factor of the conical nanopore can be adjusted by adding larger counterion size salt or multivalent ions.
Article
Physics, Applied
Luca Galletti, Arman Rashidi, David A. Kealhofer, Manik Goyal, Binghao Guo, Yuntian Li, Chen Shang, John E. Bowers, Susanne Stemmer
Summary: This study utilizes a Corbino measurement geometry to observe the behavior of Dirac fermions in three-dimensional topological insulators under a strong magnetic field. The results show that in the quantum Hall regime, the transverse voltage exhibits a series of plateaus, compared with traditional Hall bar measurements.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Kabin Lin, Zhongwu Li, Yi Tao, Kun Li, Haojie Yang, Jian Ma, Tie Li, Jingjie Sha, Yunfei Chen
Summary: The study proposes a theoretical model to predict the surface charge density of a Si3N4 nanopore, revealing its dependence on both pH and salt concentration. It is found that while silanol groups are major determinants of surface charge, the influence of amine groups should not be neglected as even a small number can dramatically alter the isopotential point (pH(iep)) of the nanopore.
