Article
Chemistry, Physical
Bin Wu, Takuya Iwashita, Wei-Ren Chen
Summary: In this study, the electroviscous effects on shear rheology of highly charged silica particles were investigated. The system undergoes a glass transition as the salinity varies, and the steady shear viscosities follow critical scaling relations. Quantitative relationships between shear viscosity, stress, and salinity were established based on the scaling relations and common modeling equations.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Chemistry, Physical
Nicholas H. P. Orr, Taiki Yanagishima, Igor P. Dolbnya, Andrei V. Petukhov, Roel P. A. Dullens
Summary: We studied the crystallization process of colloidal dispersions under capillary-action-induced shear and found that shear near the capillary walls can result in large hexagonal close-packed crystals with long-range orientational order. We observed partial crystallization under shear, starting with hexagonal planes at the capillary walls and followed by epitaxial crystal growth after the shear is stopped. The shear-induced crystallization leads to larger particle separations parallel to the shear and vorticity directions compared to the equilibrium structure.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Yihao Chen, Qingteng Zhang, Subramanian Ramakrishnan, Robert L. Leheny
Summary: We studied the gel formation and aging in suspensions of nanocolloidal spheres with tunable attraction strength. The results showed that the suspensions form gels with increasing elastic shear modulus and slowing microscopic dynamics. The aging rate is faster for stronger attractions, and when the attraction strength is suddenly lowered, the gel properties exhibit non-monotonic behavior before eventually converging to the properties of gel aged at the lower attraction strength.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
J. C. Riedl, M. Sarkar, T. Fiuza, F. Cousin, J. Depeyrot, E. Dubois, G. Meriguet, R. Perzynski, V Peyre
Summary: By carefully selecting the species at the solid-liquid interface, stable ionic liquid-based colloidal dispersions can be obtained at room temperature for years, and remain stable at temperatures up to 200 degrees C with concentrations up to 12 vol% (= 30 wt%).
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Bharti, Partha P. Gopmandal, S. Bhattacharyya, H. Ohshima
Summary: This study explores gel electrophoresis of a charged dielectric hydrophobic colloid in a charged hydrogel medium with slip velocity conditions. The presence of immobile charges in the gel medium leads to a modified Debye layer and strong background electroosmotic flow, distinguishing gel electrophoresis from free-solution electrophoresis. A first-order perturbation analysis provides a closed form solution for mobility, with implications for mobility reversal by varying Debye length or gel permeability, and the influence of particle dielectric permittivity on mobility. The derivation of a simplified mobility expression allows for easy computation based on parameter values.
Article
Computer Science, Artificial Intelligence
Saifullahi Aminu Bello, Cheng Wang, Xiaotian Sun, Haowen Deng, Jibril Muhammad Adam, Muhammad Kamran Afzal Bhatti, Naftaly Muriuki Wambugu
Summary: This article introduces a deep learning model called PDConvNet for handling rigid transformation on 3D point clouds. By extracting invariant features from the point set, the model is able to maintain invariance during rigid transformations and achieve competitive performance on point cloud classification and segmentation tasks.
EXPERT SYSTEMS WITH APPLICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Anand Kumar Tiwari, Debasis Sen, Avik Das, Jitendra Bahadur
Summary: This study demonstrates the evidence of size stratification of nanoparticles in far-from-equilibrium configurations by using small-angle X-ray scattering and particle packing simulation, revealing the concentration of larger particles at the outer shell and the residence of smaller particles in the core region in assembled microgranules.
Article
Engineering, Multidisciplinary
Ningyu Liu, Huajiang Ouyang
Summary: This paper studies the dynamical model for friction-induced vibration of two rigid circular plates in point contact. The coupling of translational and rotational motion increases the complexity of the dynamics of the friction-excited system. The study shows that the coupling greatly expands the range of operating parameters for dynamic instability and leads to rich bifurcation behaviors.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Chemistry, Physical
Maxime Liard, Didier Lootens, Pascal Hebraud
Summary: The aggregation behavior of attractive colloidal silica suspension was studied under oscillatory flow using rheological measurement. It was found that the competition between particle aggregation and aggregate breakup under external stress resulted in a non-monotonous evolution of the elastic modulus over time. Interestingly, the elasticity exhibited a maximum under certain conditions, rather than continuously increasing with time. The value of this maximum elastic modulus depended on the shear amplitude and ionic strength of the suspension. Scaling laws were proposed and discussed to describe the evolutions of the elastic modulus as a function of salinity and deformation amplitude.
EUROPEAN PHYSICAL JOURNAL E
(2023)
Article
Physics, Multidisciplinary
Mohammed A. Abdelaziz, Jairo A. A. Diaz, Jean-Luc Aider, David J. Pine, David G. Grier, Mauricio Hoyos
Summary: The study found that emulsion droplets trapped in an ultrasonic levitator organize themselves into single-file chains, unlike solid spheres which tend to form planar structures. The behavior of these chains suggests that the droplets are rapidly spinning around a common axis, distinguishing them from solid spheres. This acoustically induced spinning mechanism guides the self-organization of acoustically levitated matter, as demonstrated in the model system presented in the study.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Education & Educational Research
Jih-Yuan Chang, Meng-Fei Cheng, Shih-Yin Lin, Jang-Long Lin
Summary: The ability to translate between different representations is crucial for students' conceptual learning, especially in the topic of torque and rotation. The study found that translations between tables and other representations are particularly challenging, and force diagrams and mathematic symbols/equations play a significant role in successful translations.
TEACHING AND TEACHER EDUCATION
(2021)
Article
Physics, Fluids & Plasmas
F. Carrique, E. Ruiz-Reina, F. J. Arroyo, M. L. Jimenez, S. Ahualli, A. Delgado
Summary: A general model is developed to study the electrokinetics and dielectric response of a concentrated salt-free colloid, taking into account the finite size of the counterions released by the particles. The effects of counterion finite size are investigated using a hard-sphere model approach. The study provides insights on the importance of counterion finite-size effects for the electrokinetic and dielectric properties of highly charged and concentrated colloids.
Article
Optics
Wenchang Wu, Matthias Samuel Guenter Knoll, Cedric Giraudet, Michael Heinrich Rausch, Andreas Paul Froeba
Summary: The particle self-diffusivities in unimodal and bimodal aqueous dispersions were characterized using dynamic light scattering (DLS) with a heterodyne detection scheme. The study found that for unimodal dispersions at near infinite dilution, it was not possible to achieve pure homodyne conditions, resulting in an increasing underestimation of diffusivity as the concentration decreased. Even for bimodal dispersions, the coherent superposition of scattered light from different particle species hindered the clear assignment of measured signals and their evaluation for diffusivity.
Article
Chemistry, Physical
Andrew Nelson, Lawrence H. Friedman
Summary: The true thermodynamic stability of solid colloidal dispersions is usually unexpected and not thoroughly validated. In this study, classical nucleation theory (CNT) is applied to these systems and a relationship between interfacial free energy density and particle size distribution is established. The experimental data of gold-thiol and magnetite nanoparticles can be well described using this relationship. The study highlights discrepancies with previous models and provides insights for future research.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Engineering, Electrical & Electronic
Dongrui Liu, Chuanchuan Chen, Changqing Xu, Qi Cai, Lei Chu, Fei Wen, Robert Qiu
Summary: Point cloud recognition is important in industrial robotics and autonomous driving. This study proposes a method called self-contour-based transformation (SCT) to address the issue of rotation robustness in point cloud recognition. Experimental results demonstrate that SCT outperforms existing methods in terms of effectiveness, efficiency, robustness, and generality in both synthetic and real-world scenarios.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Chemistry, Physical
Derek E. Huang, Roseanna N. Zia
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2020)
Article
Mechanics
Ritesh P. Mohanty, Roseanna N. Zia
JOURNAL OF FLUID MECHANICS
(2020)
Article
Mechanics
Benjamin E. Dolata, Roseanna N. Zia
Summary: The paper establishes a duality between Faxen formulas and singularity solutions, extending it to systems with coupled transport processes. By using energy methods instead of boundary conditions, the complexity of problem-solving is reduced. The reciprocal relation between operators shows that the Faxen/singularity duality is a consequence of generalized reciprocal relation between conjugate thermodynamic variables.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Physics, Condensed Matter
J. Galen Wang, Roseanna N. Zia
Summary: Persistent dynamics in colloidal glasses suggest a non-equilibrium driving force for structural relaxation during glassy aging, with osmotic pressure identified as a potential driving force. Quenching a polydisperse hard-sphere colloidal liquid into the putative glass region allows for the osmotic pressure to drive redistribution of coordination number and interparticle voids, ultimately smoothing structural heterogeneity with age. Osmotic pressure plays a crucial role in driving structural rearrangements responsible for vitrification and glassy age-relaxation, with the system eventually relaxing toward a metastable state.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Mechanics
Emma Gonzalez, Christian Aponte-Rivera, Roseanna N. Zia
Summary: In this study, a computational investigation was conducted on the equilibrium dynamics of a polydisperse hard-sphere colloidal dispersion confined in a spherical cavity. The results showed that although polydispersity tends to homogenize structure in a suspension, strong correlations induced by the cavity resist this homogenization. The effects of polydispersity on particle dynamics were found to weaken lubrication effects near the cavity wall and drive diffusivity changes by affecting many-body hydrodynamic couplings.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Chemistry, Physical
Derek E. Huang, Roseanna N. Zia
Summary: The non-Newtonian rheology of an attractive colloidal suspension was studied, finding that interactions between attractions and hydrodynamics lead to pronounced flow-induced negative osmotic pressure.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Gaddiel Y. Ouaknin, Yu Su, Roseanna N. Zia
Summary: The research team presented scalable algorithms for simulating large-scale stochastic particle systems suitable for modeling dense colloidal suspensions, glasses, and gels. They utilized the Accelerated Stokesian Dynamics (ASD) approach and developed parallel algorithms in a distributed memory architecture. In addition, they proposed a novel algorithm to efficiently simulate correlated Brownian motion with hydrodynamic interactions.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Mechanics
Brian K. Ryu, Roseanna N. Zia
Summary: Particle migration through porous media plays a crucial role in various fields such as biological cell function, drug delivery, and water filtration. However, modeling the migration rates of particles through these materials is challenging due to their complex porous network structure. This study proposes a radical Voronoi decomposition method to establish an accurate network backbone of the porous microstructure, which allows for the determination of size-specific accessible branches. The developed permeability model provides detailed insights into the material morphology, phase, and size-specific permeability of arbitrary microstructure porous media.
JOURNAL OF RHEOLOGY
(2022)
Article
Chemistry, Physical
Brian K. Ryu, Scott M. Fenton, Tuan T. D. Nguyen, Matthew E. Helgeson, Roseanna N. Zia
Summary: Modulating the interaction potential between colloids can trigger equilibrium phase transitions and non-equilibrium gelation. Traditional methods are inadequate to represent long-ranged interactions and non-equilibrium phenomena. In this study, we use experiments and simulations to explore long-ranged thermoresponsive colloidal interactions and propose a kinetics-based algorithm to select potentials that accurately replicate non-equilibrium behavior.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Christian Aponte-Rivera, Roseanna N. Zia
Summary: Two-point microrheology (TPM) is used to infer material properties of complex fluids from the correlated motion of hydrodynamically interacting probes embedded in the medium. However, previous TPM theory breaks down in confined media, and a new theory is required to account for confinement effects.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Meeting Abstract
Biophysics
Akshay Maheshwari, Emma Gonzalez-Gonzalez, Alp M. Sunol, Drew Endy, Roseanna N. Zia
BIOPHYSICAL JOURNAL
(2022)
Meeting Abstract
Biophysics
Alp M. Sunol, Roseanna N. Zia
BIOPHYSICAL JOURNAL
(2022)
Meeting Abstract
Biophysics
Theodore Yang, Daniel Jarosz, Roseanna N. Zia
BIOPHYSICAL JOURNAL
(2022)
Correction
Chemistry, Physical
Lilian C. Johnson, Roseanna N. Zia
Article
Chemistry, Physical
Lilian C. Johnson, Roseanna N. Zia
Summary: Although dense colloidal gels are typically described as a result of phase separation arrest, they continue to coarsen with age, indicating a slow but ongoing phase separation process. Mechanical yield of reversible colloidal gels releases kinetic arrest and can be viewed as non-equilibrium phase separation. Studies show that external perturbations can lead to bond relaxation and rapid reduction of potential energy, consistent with renewed phase separation.