Article
Chemistry, Physical
Yaxin Xu, Kyu Hwan Choi, Sachit G. Nagella, Sho C. Takatori
Summary: Understanding multibody interactions between colloidal particles out of equilibrium can have a significant impact on dynamical processes like colloidal self-assembly. This study presents a framework using polymer-coated colloids and demonstrates that in-plane surface mobility and mechanical relaxation of polymers at colloidal contact interfaces enable an effective, dynamic interaction. Through theoretical analysis, simulations, and optical tweezer experiments, precise control of dynamic pair interactions over a range of pico-Newton forces and seconds timescales is achieved. This model offers potential for engineering colloids with precise control over the kinetics and thermodynamics of colloidal self-assembly dynamics through interface modulation and nonequilibrium processing.
Article
Mechanics
Prathmesh M. Vinze, Akash Choudhary, S. Pushpavanam
Summary: Janus particles self-propel by generating local tangential concentration gradients, driven by chemical asymmetry along their surfaces. Theoretical framework and parameter space distribution of Janus particle motion under externally imposed linear concentration gradients are studied.
Article
Materials Science, Multidisciplinary
Mateusz Chronowski, Jaroslaw Opara, Olga A. Kogtenkova, Alexander Druzhinin, Pawel Zieba
Summary: The study revealed that the influence of Zn concentration gradient in Fe-13.5% Zn alloy on discontinuous precipitation, with simulation method showing solute concentration changes during the growth of precipitates. Varying thickness of the a phase lamella affects the growth cycle of discontinuous precipitates.
Article
Chemistry, Multidisciplinary
Kun Wang, Behrouz Behdani, Carlos A. Silvera Batista
Summary: This study presents an experimental investigation of the dynamics of charged colloids under direct currents and gradients of chemical species, showing significant pH gradients induced by current passing through water and the resulting impact on the behavior of charged colloids.
Article
Chemistry, Multidisciplinary
Vanessa Pilati, Guilherme Gomide, Rafael Cabreira Gomes, Gerardo F. Goya, Jerome Depeyrot
Summary: This study focuses on the production of bimagnetic core@shell NPs and the use of the electric double layer (EDL) as a strategy to maintain colloidal stability in aqueous ferrofluids. By adjusting the ion/counterion ratio and controlling the water content, ultrastable concentrated ferrofluids were achieved. The influence of colloidal stability on the heating response of ferrofluids was investigated by studying different levels of nanoparticle clustering achieved through changing ionic force and medium pH.
Article
Chemistry, Physical
Pedro A. Sanchez, Alessio Caciagli, Sofia S. Kantorovich, Erika Eiser
Summary: We study the effect of surface mobile DNA linkers on the self-assembly of colloidal particles using a computer simulation model. The model captures the dynamic processes and predicts the final structures based on physical parameters mapped to experimental conditions. The model is validated by comparing with experimental results, showing good agreement in terms of average effective valence and its probability distribution. The simulation model not only reproduces the experimental structures, but also provides dynamic information on the self-assembly process and the influence of particle concentration and hybridization time on effective valence.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Materials Science, Multidisciplinary
Frederic Sansoz, Xing Ke
Summary: The breakdown of grain-size strengthening to softening mechanisms in nanocrystalline alloys, particularly with regards to grain-boundary solute segregation, has been investigated through large-scale simulations. Three concentration-dependent regimes of plasticity were identified, including classical segregation strengthening, shear band-induced softening, and a previously unknown plateau of maximum strengths for intermediate solute contents. The findings highlight the complex roles of solute segregation and interfacial plasticity mechanisms in nanocrystalline alloys.
Article
Physics, Applied
Yoshika Yato, Rei Tatsumi, Yoshiko Tsuji
Summary: The study investigates how the fabrication conditions of self-assembled colloidal films affect their structural color. Two numerical simulation techniques are combined to analyze the microstructure and calculate the structural color intensity. The study suggests that a larger surface tension of the solvent and a smaller drying rate improve the structural color intensity.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Luca Tonti, Fabian A. Garcia Daza, Alessandro Patti
Summary: The diffusion of macromolecules in dense colloidal suspensions is significantly affected by the presence of randomly oriented clusters of colloidal cuboids, leading to pronounced non-Gaussian dynamics. The influence of long-range orientational ordering on diffusion and the role of ordered crowding in different phases are carefully studied in this work.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Soil Science
Yuming Zhang, Zhenjun Yang, Feng Wang, Xiaoxian Zhang
Summary: The study calculated the tortuosity of 30 soil aggregates using three different methods and found that while there is correlation between the calculated tortuosities, there is no one-to-one relationship between them. The tortuosity decreases as porosity increases, indicating it is a process-dependent parameter.
Article
Chemistry, Multidisciplinary
Julio Car, Niksa Krstulovic
Summary: This work presents a complete fitting procedure for UV-Vis spectra of silver nanoparticles in colloidal solutions. The fitting function, based on the Beer-Lambert law, Mie theory, and log-normal probability distribution of nanoparticles' sizes, is validated by independent measurements and can be used regardless of the method of nanoparticle production. The fitted parameters allow determination of the nanoparticle size distribution and enable size distribution reconstruction and concentration calculation.
Article
Multidisciplinary Sciences
Fangfang Deng, Juntao Chen, Junxiang Xiang, Yong Li, Yan Qiao, Ze Liu, Tao Ding
Summary: Researchers have successfully achieved light-programmed control of bistate colloidal actuation using photothermal active plasmonic substrate, which helps to mimic and understand natural complex systems.
Article
Chemistry, Multidisciplinary
Gulzhian Dzhardimalieva, Lyubov Bondarenko, Erzsebet Illes, Etelka Tombacz, Nataliya Tropskaya, Igor Magomedov, Alexander Orekhov, Kamila Kydralieva
Summary: The production of stable and homogeneous batches during nanoparticle fabrication is challenging, with an important consideration being the dispersion stage of pre-formed samples. Stirred samples showed a higher loading capacity towards polyanions compared to sonicated ones.
Article
Chemistry, Analytical
Shizheng Zhou, Edgar S. Fu, Bingbing Chen, Hong Yan
Summary: This study introduces a unique microfluidic coral polyp culture chip, which allows for multivariable analysis and has been verified through numerical simulation.
Article
Physics, Applied
Lifei Du, Runbo Tian, Tiantian Shi, Youqi Cao
Summary: A numerical study was conducted on the spinodal decomposition in Fe-40at.%Cr binary alloy using a phase-field model based on the Cahn-Hilliard equation. The effects of temperature gradients on solute distribution characteristics during spinodal decomposition were investigated, revealing the possibility of achieving metastable stratification with specified temperature distribution. Critical temperature and corresponding temperature gradient were determined for achieving obvious solute stratification in the binary Fe-Cr alloy.
MODERN PHYSICS LETTERS B
(2021)