Article
Chemistry, Physical
Bing Liu, Jiajia Zhou, An-Chang Shi
Summary: This study quantitatively investigates the rotational dynamics of discoid particles in quasi-two-dimensional colloidal plastic crystals stabilized via depletion interactions using time-resolved confocal microscopy. The results reveal a strong coupling between lattice symmetry and particle rotation, resulting in anisotropic rotational dynamics resembling the underlying hexagonal crystalline symmetry. The observed slow rotational diffusion is attributed to orientational minima and potential barriers on the potential surface. These findings provide important insights into the role of attraction in the phase behaviors of plastic crystals.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Bing Liu, Jiajia Zhou, An-Chang Shi
Summary: The rotational dynamics of discoid particles in quasi-two-dimensional colloidal plastic crystals stabilized via depletion interactions were studied using time-resolved confocal microscopy. A strong coupling between the lattice symmetry and particle rotation was observed, resulting in anisotropic rotational dynamics resembling the underlying hexagonal crystalline symmetry. The presence of orientational minima and potential barriers on the potential surface was found to contribute to the slow rotational diffusion.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Johannes Halbinger, Matthias Punk
Summary: The study focuses on spin density wave quantum critical points in two-dimensional metals with a quenched disorder potential coupling to the electron density. By using perturbative one-loop renormalization group analysis, the interaction between fermionic and bosonic excitations is fully taken into account. The results show that disorder dominates at low energies, indicating that the ground state in two dimensions is Anderson-localized.
Article
Mechanics
Dan Shafir, Stanislav Burov
Summary: In this study, we investigate the biased quenched trap model on a two-dimensional lattice with diverging expected dwell times. By using the double-subordination approach and calculating the return probability in 2D, we obtain the disorder averaged probability density function of the particle's position as a function of time (for any given bias) in the limit of large times (t -> infinity). We calculate the first and second moments and find a formula for a general mu th moment. The behavior of the first moment, < x(t)>, shows non-linear response in both time and the applied external force F-0.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2022)
Article
Multidisciplinary Sciences
Noman Hanif Barbhuiya, A. G. Yodh, Chandan K. Mishra
Summary: The authors report that the hydrodynamics and correlated motion of colloids in the near-field interactions are not fully understood, and demonstrate that the motion of particle-pairs in the near-field is direction-dependent and not governed by the Stokes-Einstein relation. They experimentally explore the hydrodynamic correlations between particles in quasi-two-dimensional colloidal fluids and uncover significant ramifications of near-field hydrodynamics on transport and dynamic restructuring of fluids in two-dimensions.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Clement Duval, Nicolas Cherroret
Summary: We theoretically study the non-equilibrium dynamics of a two-dimensional uniform Bose superfluid after a sudden quantum change, from its short-term coherent dynamics to long-term thermalization. By using a quantum hydrodynamic description and a Keldysh field formalism, we derive quantum kinetic equations for the low-energy phononic excitations of the system and characterize their normal and anomalous momentum distributions. We apply this framework to the interaction change of a 2D Bose gas and investigate the subsequent dynamics of its quantum structure factor and coherence function, both of which have recently been measured experimentally. Our results indicate that, in two dimensions, an independent quasiparticle description quickly becomes inaccurate and should be questioned when dealing with non-equilibrium scenarios.
Article
Physics, Applied
Alexander S. Balankin, M. A. Martinez-Cruz, E. Reyes de Luna
Summary: The effects of geometric confinement on random walks and diffusion processes in systems of reduced dimensionality are studied in this work. Monte Carlo simulations reveal that the crossover behavior from two- to one-dimensional diffusion in the Fickian regime is controlled by the ratio of strip width to the standard deviation of the walker step length distribution, with the characteristic time scaling quadratically with this ratio.
MODERN PHYSICS LETTERS B
(2022)
Article
Multidisciplinary Sciences
Xiaopeng Huang, Virendra K. Parashar, Martin A. M. Gijs
Summary: This study systematically investigates the ripening behavior of 2D CdSe NCs and finds that a low acetate/oleate ratio, low Cd/Se ratio, and low monomer concentration facilitate the formation of 0D NCs. The presence of a high Cd/Se ratio leads to a porous nanosheet intermediate, while a low Cd/Se ratio results in a saw-like nanosheet intermediate during ripening. These insights are crucial for controlled synthesis of 0D and 2D CdSe NCs.
Article
Chemistry, Physical
Nathan A. Mahynski, Bliss Han, Daniel Markiewitz, Vincent K. Shen
Summary: This paper describes a method for deriving surface functionalization patterns for colloidal systems, enabling them to self-assemble into chosen periodic symmetries. The genes for symmetry are derived from 2D parabolic orbifolds based on first principles, providing a new approach for designing colloidal units.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Review
Chemistry, Multidisciplinary
Nilotpal Kapuria, Niraj Nitish Patil, Kevin M. Ryan, Shalini Singh
Summary: This review summarizes the recent progress in the synthesis, growth mechanisms, properties, and applications of 2D copper-based nanostructures with tunable compositions, dimensions, and crystal phases. The growth mechanisms concerning shape evolution in two dimensions are highlighted, and the effectiveness of cation exchange in synthesizing multinary nanocrystals is analyzed. The control achieved via colloidal approaches and the potential applications in catalysis, energy storage, and sensing are discussed.
Article
Chemistry, Multidisciplinary
Hoang Long Nguyen, Thanh Nhut Do, Emek G. Durmusoglu, Merve Izmir, Ritabrata Sarkar, Sougata Pal, Oleg V. Prezhdo, Hilmi Volkan Demir, Howe-Siang Tan
Summary: In this study, the ultrafast spectral diffusion, vibronic dynamics, and energy relaxation of CdSe colloidal quantum wells (CQWs) at room temperature were measured using two-dimensional electronic spectroscopy (2DES). The energy relaxation from light-hole (LH) excitons to heavy-hole (HH) excitons was observed to occur within a time scale of approximately 210 fs. Equilibration dynamics between the spectroscopically accessible HH excitonic state and a dark state were found to take place within a time scale of approximately 160 fs. The spectral diffusion dynamics in HH excitons were analyzed using center line slope analysis, revealing a sub-200 fs decay and oscillatory features resolved at 4 and 25 meV. Quantum calculations were performed to replicate and explain the observed dynamics. The 4 meV mode was found to be in the near-critically damped regime and may mediate the transition between the bright and dark HH excitons. These findings demonstrate the capability of 2DES to comprehensively and detailedly characterize the ultrafast spectral properties in CQWs and similar nanomaterials.
Article
Chemistry, Physical
Ritu R. Raj, C. Wyatt Shields, Ankur Gupta
Summary: Diffusiophoresis is the movement of colloidal particles in response to solute concentration gradients. This study investigates the effect of two-dimensional solute gradients on the distribution of colloidal particles. Through numerical simulations, the authors found that the diffusion and decay timescales play a crucial role in colloidal banding induced by diffusiophoresis. The optimal separation distance for particle enrichment depends on the solute molar rate and the partition coefficient of solute at the interface between the source and bulk.
Article
Physics, Multidisciplinary
Leiming Chen, Chiu Fan Lee, Ananyo Maitra, John Toner
Summary: This study investigates the ordered phase of incompressible polar active fluids in the presence of quenched disorder in two dimensions. The research reveals the robustness of the ordered state and provides scaling laws. The findings have significant implications for understanding the coherent motion of biological systems.
PHYSICAL REVIEW LETTERS
(2022)
Article
Statistics & Probability
M. T. Barlow, D. A. Croydon, T. Kumagai
Summary: This article investigates the heat kernel of the two-dimensional uniform spanning tree, improving previous work by demonstrating log-logarithmic fluctuations and giving two-sided estimates for the on-diagonal part of the kernel. It also shows that the exponents in different parts of the quenched and averaged versions of the heat kernel differ, and derives various scaling limits which sharpen known asymptotics for the averaged heat kernel and expected distance traveled by a simple random walk.
PROBABILITY THEORY AND RELATED FIELDS
(2021)
Article
Multidisciplinary Sciences
Carla Fernandez-Rico, Roel P. A. Dullens
Summary: Research has found that polydisperse colloidal bananas can self-assemble into a complex and hierarchical structure, called the vortex phase, solely due to excluded volume interactions and polydispersity in particle curvature. The formation mechanism of the vortex phase and its exotic structure and dynamics have been uncovered and characterized at the single-particle level using confocal microscopy. These results demonstrate that hierarchical self-assembly of complex materials can be driven by entropy and shape polydispersity of the constituting particles.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Physics, Multidisciplinary
Xiaoguang Ma, Zoey S. Davidson, Tim Still, Robert J. S. Ivancic, S. S. Schoenholz, A. J. Liu, A. G. Yodh
PHYSICAL REVIEW LETTERS
(2019)
Article
Chemistry, Physical
Xiaoguang Ma, Jiachen Liu, Yikang Zhang, Piotr Habdas, A. G. Yodh
JOURNAL OF CHEMICAL PHYSICS
(2019)
Article
Multidisciplinary Sciences
Ali Seiphoori, Xiao-guang Ma, Paulo E. Arratia, Douglas J. Jerolmack
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Physics, Multidisciplinary
Dongshi Guan, Elisabeth Charlaix, Penger Tong
PHYSICAL REVIEW LETTERS
(2020)
Article
Multidisciplinary Sciences
K. Lawrence Galloway, Xiaoguang Ma, Nathan C. Keim, Douglas J. Jerolmack, Arjun G. Yodh, Paulo E. Arratia
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Engineering, Mechanical
Yin Wang, Wei Xu, Pik-Yin Lai, Penger Tong
Summary: Inspired by experimental and numerical findings, this study investigates the dynamic instabilities of two coupled nonlinear delay differential equations describing coherent oscillations in turbulent Rayleigh-Benard convection. The research identifies three types of solutions - in-phase single-period oscillations, multi-period oscillations, and chaos, with the chaos solution exhibiting rare but large amplitude fluctuations consistent with experimental observations. The findings shed new light on the origin of rare massive eruptions and sudden changes in large-scale flow patterns in convection systems on geophysical and astrophysical scales.
NONLINEAR DYNAMICS
(2021)
Article
Mechanics
Wei Xu, Yin Wang, Xiaozhou He, Xiaoping Wang, Joerg Schumacher, Shi-Di Huang, Penger Tong
Summary: This study investigates the mean velocity and temperature profiles in turbulent Rayleigh-Benard convection at low Prandtl numbers through direct numerical simulation, revealing changes in flow patterns and proposing balance equations to describe the distribution characteristics of velocity and temperature.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Chemistry, Physical
Xiaoguang Ma, Chandan K. Mishra, P. Habdas, A. G. Yodh
Summary: The study reveals that in two-dimensional, bidisperse colloidal glasses and supercooled liquids, the anharmonicity of in-cage vibrations and effective spring constants show non-monotonic variations with increasing interparticle depletion attraction strength.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Mechanics
Yin Wang, Yongze Wei, Penger Tong, Xiaozhou He
Summary: This study systematically investigates the collective impact of thermal plumes on temperature fluctuations in turbulent Rayleigh-Benard convection. By analyzing temperature fluctuations in different convection cells, the study reveals that the probability density functions fall onto a single master curve when normalized. The fitted parameters associated with the number of plumes and their strengths provide insights into the spatial distribution of thermal plumes and local dynamics in closed convection cells.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Hailong Huang, Wei Xu, Yin Wang, Xiaoping Wang, Xiaozhou He, Penger Tong
Summary: This study systematically investigates the mean temperature profile and temperature variance profile across a stable liquid-liquid interface formed in two-layer turbulent Rayleigh-Benard convection. The experimental results show that the temperature and variance profiles near the liquid interface can be well described by boundary layer equations meant for solid surfaces, with the introduction of a thermal slip length. Direct numerical simulation results further confirm that the turbulent thermal diffusivity near a stable liquid interface exhibits a complete cubic form.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Chemistry, Physical
Analisa Hill, Michio Tanaka, Kevin B. Aptowicz, Chandan K. Mishra, A. G. Yodh, Xiaoguang Ma
Summary: In this study, we investigate the effects of depletion interactions on quasi-two-dimensional buckled colloidal monolayers. The results show that depletion attraction can modify the magnitude and sign of the Ising spin coupling constant, leading to a variation in the nearest-neighbor Ising spin interactions from antiferromagnetic to para- and ferromagnetic. By using a simple theory, we calculate an effective Ising nearest-neighbor coupling constant and demonstrate experimentally the depletion-induced modification of the coupling constant, including its sign and other behaviors. Additionally, we observe a crossover from an Ising antiferromagnetic to paramagnetic phase with increasing depletion attraction, and structural arrest in different regimes of the coupling constant driven by different mechanisms.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
Yan Wen, Zhihao Li, Haiqin Wang, Jing Zheng, Jinyao Tang, Pik-Yin Lai, Xinpeng Xu, Penger Tong
Summary: We conducted a systematic study on the dynamics of self-propelled particles (SPPs) on a one-dimensional periodic potential landscape fabricated on a microgroove-patterned PDMS substrate. By analyzing the measured nonequilibrium probability density function P(x; F0) of the SPPs, we found that the escape dynamics of slow rotating SPPs across the potential landscape can be described by an effective potential Ueff(x; F0) when taking the self-propulsion force F0 into account under the fixed angle approximation. This work demonstrates that parallel microgrooves offer a versatile platform for quantitatively understanding the interplay among the self-propulsion force F0, spatial confinement by U0(x), thermal noise, and their effects on the activity-assisted escape dynamics and transport of the SPPs.
Article
Physics, Multidisciplinary
Yusheng Shen, Chengjie Luo, Yan Wen, Wei He, Pingbo Huang, Hsuan-Yi Chen, Pik-Yin Lai, Penger Tong
Summary: Through experiments and theory, we demonstrate that anchored proteins inside the cell can generate a spatially varying and temporally stable potential landscape for intracellular or membrane transport in the mesoscale. By imposing a periodic potential on the lateral motion of nicotinic acetylcholine receptors, anchored integrins affect the drift velocity and diffusion coefficient of the receptors, suggesting they play an essential role in guiding molecular motion at the mesoscale.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Physics, Multidisciplinary
Dongshi Guan, Yusheng Shen, Rui Zhang, Pingbo Huang, Pik-Yin Lai, Penger Tong
Summary: The study used atomic force microscopy to measure the compressive modulus of 10 different types of cells, revealing characteristic decays at different time scales and their close connection to the structure and active stress of cells.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Physics, Fluids & Plasmas
Chandan K. Mishra, Xiaoguang Ma, Piotr Habdas, Kevin B. Aptowicz, A. G. Yodh
Article
Chemistry, Physical
Yiping Yin, Zhe Wang, Hua Zou
Summary: This study presents a novel method for preparing dimpled polymer-silica nanocomposite particles using interfacial swelling-based seeded polymerization. The optimized conditions allow for a relatively high percentage of dimpled particles to be achieved.
Article
Chemistry, Physical
Brenden D. Hoehn, Elizabeth A. Kellstedt, Marc A. Hillmyer
Summary: Porous materials with nanometer-scale pores have important applications as nanoporous membranes. In this study, ABA triblock copolymers were used as precursors to produce nanoporous polymeric membranes (NPMs) in thin film form by degrading the end blocks. Polycyclooctene (PCOE) NPMs with tunable pore sizes were successfully prepared using solvent casting technique. Oxygen plasma etching was employed to improve the surface porosity and hydrophilicity of the membranes. This study provides a straightforward method to produce tough NPMs with high porosity and hydrophilic surface properties.
Article
Chemistry, Physical
Vladislav S. Petrovskii, Stepan I. Zholudev, Igor I. Potemkin
Summary: This article investigates the behavior of linear and ring polypeptide chains in aqueous solution and explores the properties of the complexes formed by these chains with oppositely charged surfactants. The results demonstrate that the complexes of linear supercharged unfolded polypeptides and the corresponding surfactants exhibit impressive adhesive properties.
Article
Chemistry, Physical
Merve Cevik, Serkan Dikici
Summary: Cardiovascular diseases are a leading cause of death globally, and vascular grafts are a promising treatment option. This study focuses on tissue-engineered vascular grafts (TEVGs) using decellularized parsley stems as a potential biomaterial. The decellularized parsley stems showed suitable properties for TEVGs, providing a suitable environment for human endothelial cells to form a pseudo endothelium. This study showcases the potential of using parsley stems for TEVGs.
Article
Chemistry, Physical
Gustavo A. Vasquez-Montoya, Tadej Emersic, Noe Atzin, Antonio Tavera-Vazquez, Ali Mozaffari, Rui Zhang, Orlando Guzman, Alexey Snezhko, Paul F. Nealey, Juan J. de Pablo
Summary: The optical properties of liquid crystals are typically controlled by electric fields. In this study, we investigate the effects of microfluidic flows and acoustic fields on the molecular orientation and optical response of nematic liquid crystals. We identify several previously unknown structures and explain them through calculations and simulations. These findings hold promise for the development of new systems combining sound, flow, and confinement.
Article
Chemistry, Physical
Xinjun Wu, Xin Guan, Shushu Chen, Jiangpeng Jia, Chongyi Chen, Jiawei Zhang, Chuanzhuang Zhao
Summary: This research presents a novel shape memory hydrogel with a remodelable permanent shape and programmable cold-induced shape recovery behavior. The hydrogel is prepared using specific treatment methods to achieve shape fixation by heating and shape recovery by cooling. Additionally, deformable devices can be obtained by assembling hydrogel blocks with different concentrations.
Article
Chemistry, Physical
Rebecca Hengsbach, Gerhard Fink, Ulrich Simon
Summary: This study examines the properties of DNA functionalized pNipmam microgels and pure pNipmam microgels at different concentrations of sodium chloride and in PBS solutions using temperature dependent H-1-NMR measurements. The results show that DNA modification affects the volume phase transition temperature and the addition of salt and PBS further enhances this effect.
Article
Chemistry, Physical
Ningyi Li, Junhong Li, Lijingting Qing, Shicheng Ma, Yao Li, Baohui Li
Summary: This paper investigates the self-assembly behavior of colloids with competing interactions under spherical confinement and finds that different ordered structures can be formed under different sized spherical confinements. Moreover, more perforated structures are formed in smaller spheres.
