Article
Chemistry, Physical
Thomas G. Mason
Summary: This study extends the concept of depletion forces between spheres to depletion torques affecting the orientations of colloidal particles with complex shapes. It demonstrates that depletion torques can be tailored by designing specific geometrical features in the shapes of particles.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Elshadc Allahyarov, Hartmut Lowen, Alan R. Denton
Summary: In this study, we investigate the structural correlations in strongly asymmetric mixtures of binary charged colloids. We find that the amplitude of the big-small correlation peak is smaller than that of the big-big and small-small correlation peaks. Furthermore, we discover that an additional shifted Gaussian attractive potential between the small macroions is needed to accurately reproduce their correct pair correlations.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
Peng Liu, Luhui Ning, Yiwu Zong, Fangfu Ye, Mingcheng Yang, Ke Chen
Summary: In this study, experiments and computer simulations were performed to investigate the effective interactions between like-charged colloidal tracers moving in a two-dimensional fluctuating background of colloidal crystal. The results show the presence of an effective attraction between the tracers, which weakens as the background lattice constant increases. This lattice-mediated attraction is a result of the minimization of free energy increase from deformation of the crystalline background due to the presence of diffusing tracers.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Physical
Jun Nozawa, Satoshi Uda, Akiko Toyotama, Junpei Yamanaka, Hiromasa Niinomi, Junpei Okada
Summary: Colloidal epitaxy can create colloidal crystals with the same structure as the substrate, but has been limited to single-component systems. By adjusting particle sizes and polymer concentrations, various types of colloidal crystals can be produced. Heteroepitaxial growth enables the fabrication of complex multicomponent colloidal crystals, offering versatile applications.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Review
Optics
K. Monisha, K. Suresh, Sajan D. George
Summary: The conversion of light to heat via the photothermal effect has been used to evaluate thermo-optic properties of materials, but recently it has also been used for the manipulation of colloidal objects and living cells. Optothermal manipulation techniques utilize lower optical power and can manipulate particles over a long range compared to conventional optical tweezers. This review discusses the working mechanisms, concepts, and applications of recently established optothermal techniques, as well as the physical mechanisms behind the optical manipulation.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Physical
Wei Li, Kris T. Delaney, Glenn H. Fredrickson
Summary: The study developed a SCFT method to investigate polymer-mediated colloidal interactions, focusing on depletion effects and exploring mean-field interactions under different physical conditions. The results demonstrated good agreement with previous studies and experiments, extending the work to new regimes and discussing the mechanisms of attraction and repulsion along with the influence of individual factors.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Review
Materials Science, Multidisciplinary
Hong Zhang, Dongyang Kong, Wenchao Zhang, Huaqing Liu
Summary: Depletion attraction is a commonly observed entropy force in colloidal systems, and studying its mechanism and application is of great importance for various purposes. This article provides a brief overview of the calculation and measurement methods of depletion attractions, reviews their application in colloidal systems, and summarizes the different phenomena and aggregation mechanisms caused by depletion attraction in active colloidal particle-bacterial systems. Understanding the specific role of depletion aggregation in colloidal and bacterial systems opens up possibilities for further exploring depletion aggregation mechanisms and utilizing depletion aggregation phenomena in nature.
FRONTIERS IN MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Lechuan Zhang, Huda A. A. Jerri, Michael A. A. Bevan
Summary: The deposition of silica microparticles on glass substrates was investigated as a function of cationic polymer-anionic surfactant composition and shear rate. The study demonstrated the ability to control deposition behavior by designing initial polymer-surfactant compositions and shear profiles. The particle trajectory analysis developed in this work provides an assay for screening composition-dependent colloidal deposition in various materials and applications.
Article
Chemistry, Physical
Horacio Serna, Antonio Diaz Pozuelo, Eva G. Noya, Wojciech T. Gozdz
Summary: The study suggests that colloidal particles with short-range attractive and long-range repulsive interactions can form periodic microphases with a proper balance between these forces. Molecular dynamics simulations show that a model system can stabilize cluster-crystal, cylindrical, and lamellar phases at low temperatures, with the internal freezing of clusters observed at even lower temperatures. Furthermore, the research indicates that the three periodic microphases are kinetically accessible from the fluid phase under specific model parameters.
Article
Polymer Science
Heyi Liang, Juan J. de Pablo
Summary: In this study, the properties of polyelectrolyte coacervates under different salt concentrations were investigated using molecular dynamics simulations. The interfacial tension and microscopic structure of the coacervates were found to be affected by the salt concentration. Similar to neutral polymer solutions, the structure and dynamics of the coacervates were influenced by the screening of electrostatic interactions. The polyelectrolyte chains adopted ideal conformations and their relaxation behavior could be described by the Rouse model. The stress relaxation modulus of coacervates with different salt and polymer concentrations could be superimposed to form a master curve, in agreement with experimental observations of the "salt-time superposition" principle.
Article
Chemistry, Multidisciplinary
Kohji Ohno, Tatsuya Hisatomi, Haruna Seo
Summary: Colloidal crystals are self-assembled systems suitable for studying crystallization. By synthesizing charged-polymer-brush-decorated core-shell hybrid particles through surface-initiated living radical polymerization, colloidal crystals were successfully constructed in an organic solvent.
Article
Chemistry, Physical
Nestor M. de los Santos-Lopez, Gabriel Perez-Angel, Jose M. Mendez-Alcaraz, Ramon Castaneda-Priego
Summary: The article systematically studies the depletion interactions between colloidal particles, focusing on how the composition of depletants drives the competition between attraction and repulsion. Results are obtained through theoretical analysis and computer simulations.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Sofia M. Morozova, Leticia Lopez-Flores, Albert Gevorkian, Honghu Zhang, Vahid Adibnia, Weiqing Shi, Dmytro Nykypanchuk, Tatiana G. Statsenko, Gilbert C. Walker, Oleg Gang, Monica Olvera de la Cruz, Eugenia Kumacheva
Summary: Particle softness plays an important role in the formation of colloidal clusters and gels. Experimental and simulation studies were conducted to investigate the impact of particle softness on the assembly of clusters and networks from mixtures of oppositely charged polymer nanoparticles. It was found that hard nanoparticles formed fractal clusters and subsequently organized into a kinetically arrested colloidal gel, while soft nanoparticles formed dense precipitating aggregates. Moreover, interactions between hard and soft nanoparticles resulted in the formation of discrete precipitating aggregates at a relatively low volume fraction of soft nanoparticles.
Article
Chemistry, Physical
C. M. Martens, S. H. M. van Leuken, J. Opdam, M. Vis, R. Tuinier
Summary: In this study, a simple yet accurate mean-field expression for the depletion thickness of a solution of dilute semi-flexible polymers near a hard surface is derived. The derived equations provide a quantitative description of the depletion thickness as a function of chain stiffness and polymer concentration, and are in agreement with numerical computations. The findings suggest that there is a maximum depletion thickness in the semi-dilute concentration regime, which could have important implications for the phase stability of colloidal-polymer mixtures.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Manas Kumar Mandal, Manas Barai, Emili Manna, Habiba Sultana, Raja Ghosh, Dulal Musib, Kaushik Nag, Amiya Kumar Panda
Summary: The salt free surface active ionic liquids (SAILs) [bmim]DS and [bmp]DS were synthesized by mixing IL and SDS. The interfacial and aggregation behavior of SAILs were investigated, showing differences compared to the precursor surfactant SDS. SAILs have dual advantages of surfactant and IL with lower toxicity levels.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Nanoscience & Nanotechnology
Helya Najafi, Huda A. Jerri, Valentina Valmacco, Matthew G. Petroff, Christopher Hansen, Daniel Benczedi, Michael A. Bevan
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Chemistry, Physical
Jianli Zhang, Yuanxing Zhang, Michael A. Bevan
JOURNAL OF CHEMICAL PHYSICS
(2020)
Article
Chemistry, Multidisciplinary
Denise Neibloom, Michael A. Bevan, Joelle Frechette
Article
Chemistry, Physical
Zijie Wu, Daniel J. Beltran-Villegas, Arthi Jayaraman
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2020)
Article
Chemistry, Multidisciplinary
Denise Neibloom, Michael A. Bevan, Joelle Frechette
Summary: The study investigates the mechanisms of spontaneous emulsification of TPM in aqueous solutions, revealing that diffusion and stranding likely drive droplet formation and growth. The pH modulates the growth mechanism of droplets, while the addition of surfactants can lead to kinetically stable droplets. Surfactants such as Tween, SDS, or cetyltrimethylammonium bromide influence the growth and number density of droplets through different mechanisms.
Article
Chemistry, Physical
Isaac Torres-Diaz, Rachel S. Hendley, Akhilesh Mishra, Alex J. Yeh, Michael A. Bevan
Summary: This study investigates the relationship between the phases of two-dimensional convex hard superellipse particles and particle shape parameters through computer simulations. By analyzing various shapes including disks, ellipses, squares, rectangles, and rhombuses, as well as shapes with non-uniform curvature, the researchers identify key shape properties that determine liquid crystal and crystalline phases. The results provide design rules for particle shapes to achieve specific two-dimensional microstructures.
Article
Nanoscience & Nanotechnology
Yunjia Song, Zachary D. Lamberty, Junhao Liang, Miguel Aller Pellitero, Justine S. Wagner, Eugenie Jumai'an, Michael A. Bevan, Joelle Frechette, Netzahualcoyotl Arroyo-Curras, Howard E. Katz
Summary: The study focused on utilizing a carboxylated conjugated polymer as a nanosized biomolecule receptor layer on OECT devices, achieving sub-ng detection. Changes in threshold voltage, current output, and open circuit potential provided insights into response mechanisms, guiding further development of protein sensors based on polymeric active layers with nanoscale functionality.
ACS APPLIED NANO MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Huda A. Jerri, Isaac Torres-Diaz, Lechuan Zhang, Nicholas Impellizzeri, Daniel Benczedi, Michael A. Bevan
Summary: We have developed novel mineralized protein microcapsules as an alternative to nonbiodegradable synthetic polymeric resins, addressing the environmental impact and performance challenges of various products. By mimicking the morphological features of natural pollens, we significantly improved the deposition of fragrance chemicals on target substrates under realistic application conditions. Our findings highlight the importance of material selection and the geometric taxonomic parameterization of surface morphologies in the performance of mineralized protein capsules. These findings have implications for engineering multifunctional environmentally friendly delivery systems.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Eugenie Jumai'an, Lechuan Zhang, Michael A. Bevan
Summary: We investigated the interactions between adsorbed copolymers of poly(ethylene glycol) (PEG) and two abundant blood proteins, serum albumin and immunoglobulin G, at physiological blood concentrations. Using Total Internal Reflection Microscopy, we directly measured the interactions between PEG triblock copolymers (PEG-PPO-PEG) and hydrophobic colloids and surfaces. In the presence of proteins, we observed concentration dependent depletion attraction and no change to brush repulsion, indicating the absence of protein coronas at physiological protein concentrations. These findings provide valuable insights into protein-particle/surface coating interactions in biotechnology applications.
Article
Chemistry, Multidisciplinary
Rachel S. Hendley, Lechuan Zhang, Michael A. Bevan
Summary: We report a controlled interfacial assembly and reconfiguration method for rectangular prism colloidal particles between microstructures with varying positional and orientational order. By programming time-dependent electric fields, we can manipulate the particle's position, orientation, compression, and chaining. We have identified a set of order parameters that define each state, and used them as reaction coordinates to capture the microstructure evolution. The trajectory manifolds between states reveal a dynamic pathway map that provides information about pathway accessibility, reversibility, and kinetics. By navigating this dynamic pathway map, we can achieve reconfiguration between states on minute time scales, which is useful for particle-based materials processing and device responses. Our findings demonstrate a conceptually general approach to control the assembly and reconfiguration of self-organizing building blocks that respond to global external stimuli.
Article
Chemistry, Physical
Philippe B. Baron, Rachel S. Hendley, Michael A. Bevan
Summary: This study presents a method to predict equilibrium concentration profiles of hard ellipses in nonuniform fields, including multiphase equilibria. The model is based on a balance of osmotic pressure and field mediated forces using the local density approximation. The predicted density profiles show good agreement with Monte Carlo simulations, with some small discrepancies observed at crystal-nematic and crystal-fluid interfaces.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Rachel S. Hendley, Lechuan Zhang, Michael A. Bevan
Summary: This study demonstrates the assembly of different shaped colloidal particles into ordered microstructures using a two-dimensional AC electric field. By controlling particle shape and field conditions, various liquid crystal structures and crystals can be assembled. These findings provide design rules for the assembly of diverse microstructures in AC electric fields and could have implications for particle-based materials, display technologies, and printing technologies.
Article
Chemistry, Physical
Rachel S. Hendley, Isaac Torres-Diaz, Michael A. Bevan
Summary: By identifying analytical potentials for dipole-field and dipole-dipole interactions, we match experimental and simulated configurations of anisotropic epoxy colloidal particles in high frequency AC electric fields. The inverse Monte Carlo simulation algorithm helps determine optimal fits of analytical potentials to capture experimental observations. The stretched point dipole potential is found suitable at all concentrations, field amplitudes, and degrees of ordering, showing simplicity, accuracy, and adjustability for modeling field mediated microstructures and assembly of systematically varying anisotropic particle shapes.
Article
Multidisciplinary Sciences
Jianli Zhang, Junyan Yang, Yuanxing Zhang, Michael A. Bevan
Article
Polymer Science
Eugenie Jumai'an, Elena Garcia, Margarita Herrera-Alonso, Michael A. Bevan
