Article
Multidisciplinary Sciences
Hyang Mi Lee, Yong Woo Kim, Eun Min Go, Chetan Revadekar, Kyu Hwan Choi, Yumi Cho, Sang Kyu Kwak, Bum Jun Park
Summary: Lee et al. design a like-charged colloidal model and characterize the Debye interaction for the first time at the water-oil interface. The Debye interaction plays an important role in self-assembling processes in materials.
NATURE COMMUNICATIONS
(2023)
Article
Mechanics
Yuan Lin, Ying Wang, Huaitao Qin, Dingyi Pan, Jiawang Chen
Summary: The study investigates the shear thinning behavior of non-colloidal suspensions with a focus on the effect of particle surface roughness. Two shear thinning phenomena are observed, with the first originating from particle-particle interaction and the second from polymeric solvent. Theoretical models are developed and experimental data support the findings, concluding the impact of roughness on rheological behavior.
Article
Multidisciplinary Sciences
Zhe Xu, Theodore Hueckel, William T. M. Irvine, Stefano Sacanna
Summary: The research team has created non-biological capsules that can capture, concentrate, store, and release microscopic payloads as needed. This design uses hollow colloids as cell-membrane mimics with a well-defined single pore, allowing for mass production and offering a blueprint for developing smart materials, micro-machinery, and artificial cell mimics.
Article
Chemistry, Physical
Carlo Andrea De Filippo, Sara Del Galdo, Pietro Corsi, Cristiano De Michele, Barbara Capone
Summary: The study of the phase diagram for anisotropic biological or synthetic nanoparticles is important for understanding the equilibrium phase behavior of non-spherical colloids. This research focuses on investigating the effects of polydispersity on the equilibrium phase diagram of hard spherocylindrical colloids and introduces a theoretical generalization of the Onsager theory.
Article
Chemistry, Physical
J. S. Behra, A. Thiriez, D. Truzzolillo, L. Ramos, L. Cipelletti
Summary: This paper proposes a new system to effectively control the proportion of particles in a colloidal suspension by changing the volume of hydrogel spheres. The study shows that the system exhibits similar glass transition and dynamic behavior as silica nanoparticle suspensions with different particle ratios.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Jie Zhu, Qihan Liu
Summary: This study investigates the behavior of gel surfaces and reveals that their behavior is influenced by both osmocapillary phase separation and elastocapillary deformation. A numerical model is developed to predict the phase separation and deformation on gel surfaces, and simulations are conducted to observe the behavior of sinusoidal and rough surfaces. The results show that the behavior of gel surfaces is determined by the relative lengths of osmocapillary and elastocapillary scales compared to the surface roughness scale.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Multidisciplinary Sciences
Guozheng Shi, Haibin Wang, Yaohong Zhang, Chen Cheng, Tianshu Zhai, Botong Chen, Xinyi Liu, Ryota Jono, Xinnan Mao, Yang Liu, Xuliang Zhang, Xufeng Ling, Yannan Zhang, Xing Meng, Yifan Chen, Steffen Duhm, Liang Zhang, Tao Li, Lu Wang, Shiyun Xiong, Takashi Sagawa, Takaya Kubo, Hiroshi Segawa, Qing Shen, Zeke Liu, Wanli Ma
Summary: Surfaces sensitive to the ambient environment are often covered with water, which has a significant impact on colloidal quantum dot semiconductor electronics. The interaction between water and CQDs can lead to changes in nanostructures and carrier dynamics. Introducing the meniscus-guided-coating technique can mitigate CQD fusion triggered by water adsorption, improving device performance and thermal stability.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Chemical
Duowei Lu, Pedram Fatehi
Summary: This study developed a mathematical model based on the XDLVO theory and SEI to simulate the interaction energy between ellipsoidal particles with rough surfaces. The results showed that fractal roughness on particle surfaces increased surface roughness and weakened total interaction energy. Ellipsoidal particles provided greater interaction energy than spherical particles due to their larger interaction area. Increasing particle size strengthened interaction energy, while amplifying the aspect ratio diminished it. The orientation angle of ellipsoidal particles also affected their interaction.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Forestry
Jian Zhang, Yaqi Yang, Bin Luo, Hongguang Liu, Li Li
Summary: This study explored the significance of sanding in the manufacture of MDF, investigated the wear characteristics of abrasive belt and its impact on material removal, and identified the lifecycle phases of the abrasive belt and wear patterns of involved grits.
EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
(2021)
Article
Multidisciplinary Sciences
Mohammad Nabizadeh, Safa Jamali
Summary: The study explores the coupling between the kinetics of colloidal bonds and rheological response in attractive gels under different flow regimes. It reveals the importance of interplay between particle attraction and hydrodynamic stresses in understanding the physical basis of colloidal gel rheology. The research also presents visual mapping of particle bond dynamics and stresses under various flow conditions.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
J. Alejandro Rivera-Moran, Yi Liu, Samuel Monter, Chiao-Peng Hsu, Pia Ruckdeschel, Markus Retsch, Maciej Lisicki, Peter R. Lang
Summary: The near-wall Brownian dynamics of different types of colloidal particles were investigated, revealing that rough particles diffuse significantly slower compared to smooth particles. This difference in dynamics is attributed to the rough particles significantly changing their DLVO interaction with the wall, affecting their diffusion.
Article
Physics, Fluids & Plasmas
Justin-Aurel Ulbrich, Carla Fernandez-Rico, Brian Rost, Jacopo Vialetto, Lucio Isa, Jeffrey S. Urbach, Roel P. A. Dullens
Summary: In this letter, we investigated the two-dimensional diffusion of curved colloidal rods, referred to as colloidal bananas, with different opening angles. We found that the anisotropic diffusion of the particles varied nonmonotonically with the opening angle, and the axis of fastest diffusion switched when the opening angle exceeded 180 degrees. Additionally, we observed that the rotational diffusion coefficient of closed rings was approximately ten times higher than that of straight rods. The experimental results were consistent with slender body theory, indicating that local drag anisotropy primarily influenced the particles' dynamic behavior.
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
Nanoscience & Nanotechnology
Andy T. Clark, David Marchfield, Zheng Cao, Tong Dang, Nan Tang, Dustin Gilbert, Elise A. Corbin, Kristen S. Buchanan, Xuemei M. Cheng
Summary: This study systematically investigates the effect of polymer stiffness on magnetization reversal of ultrasoft magnetorheological elastomers (MREs). The results show that the magnetic hysteresis loops of MREs exhibit characteristic shapes that vary with increasing polymer stiffness.
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)
Article
Chemistry, Physical
Prithwish Biswas, Pankaj Ghildiyal, Hyuna Kwon, Haiyang Wang, Zaira Alibay, Feiyu Xu, Yujie Wang, Bryan M. Wong, Michael R. Zachariah
Summary: By combining experimental analysis and computational calculations, this study investigates the energy release mechanisms of ammonia borane with different chemical oxidizers. The results show that the ammonia borane/NH4ClO4 system exhibits significantly higher energy release rates compared to ammonia borane/KClO4.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Nanoscience & Nanotechnology
Zaira Alibay, Daniel Olsen, Prithwish Biswas, Cody England, Feiyu Xu, Pankaj Ghildiyal, Min Zhou, Michael R. Zachariah
Summary: This study demonstrates that nanoscale aluminum/manganese oxide can be rapidly heated and controlled for ignition under microwave radiation. Detailed analysis of the materials' properties and mechanisms revealed that the electric field is the dominant mechanism in microwave ignition, and the addition of an oxidizer acts as both a microwave susceptor and an ignition driver.
ACS APPLIED NANO MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Pankaj Ghildiyal, Prithwish Biswas, Steven Herrera, Feiyu Xu, Zaira Alibay, Yujie Wang, Haiyang Wang, Reza Abbaschian, Michael R. Zachariah
Summary: This study presents a vapor-phase synthesis method to produce surface-pure core-shell nanoscale magnesium particles. The size-dependent reactivity and energetic characteristics of these particles are evaluated, and in situ characterizations reveal the enhanced reactivity of magnesium nanoparticles due to increased vaporization and magnesium release from their high-energy surfaces. These findings highlight the relationship between metal volatilization and oxidative energy release, expanding the possibilities for the design of nanoscale magnesium-based energetic materials.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Energy & Fuels
Feiyu Xu, Prithwish Biswas, Pankaj Ghildiyal, Michael R. Zachariah
Summary: Defect engineering has become an effective strategy to modulate the properties of metal oxides. In this study, the effect of oxygen defects on the ignition temperature of nanothermite reactions was investigated using Co3O4 as a model oxidizer. Results demonstrated an inverse correlation between the oxygen vacancy content in Co3O4 and the ignition temperature of Al/Co3O4 nanothermites.
Article
Chemistry, Physical
Haiyang Wang, Prithwish Biswas, Michael R. Zachariah
Summary: This study prepared Al/CuO particle laminates using a direct writing approach and investigated the interface reaction through high-speed microscopic imaging and pyrometry. The burn rate can be altered by changing the layer thicknesses of the laminates, and fingering heat transfer in the temperature profiles was observed. Numerical simulations reproduced the finger-structured reaction fronts. The lateral O-2 diffusion rate from the CuO layer to the Al layer was found to be rate-limiting. The imaging of interface reactions between particle composites provides valuable insights and validation for models.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Nanoscience & Nanotechnology
Prithwish Biswas, Feiyu Xu, Pankaj Ghildiyal, Michael R. Zachariah
Summary: This study demonstrates that coating aluminum nanoparticles with a metal ammine complex can lower the reaction initiation temperature and enhance the reaction rate. The ignition occurs due to a condensed phase reaction between the metal ammine complex and copper oxide. The rapid heat release induces strain on the aluminum core, resulting in a nonuniform thickness of the aluminum oxide shell, which enables rapid mass transfer and enhances reactivity.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Polymer Science
Md Moinuddin, Mukta Tripathy
Summary: This study investigates the effect of architecture and topology of polymer-grafted nanoparticle species on their structure, phase behavior, and scaling behavior. The phase behavior of these species undergoes an entropy-driven transition from a disordered fluid phase to microphase separation. The scaling behavior of self-assembly depends on the topology of the polymer-grafted nanoparticles.
Article
Chemistry, Physical
Michael R. Zachariah, Prithwish Biswas, Yujie Wang, Steven Herrera, Pankaj Ghildiyal
Summary: Incorporating ammonia borane (NH3BH3/AB) into polymer matrices with carbonyl functional groups can facilitate its decomposition into ammonia and borane gases, preventing its thermochemical oligomerization. This chemical pathway allows for the controlled release of reactive fuels for high-energy applications.
CHEMISTRY OF MATERIALS
(2023)
Article
Energy & Fuels
Pankaj Ghildiyal, Feiyu Xu, Alex Rojas, Yujie Wang, Mahbub Chowdhury, Prithwish Biswas, Steven Herrera, Reza Abbaschian, Michael R. Zachariah
Summary: In this paper, we investigated the effect of incorporating Mg nanoparticles as additive fuel in B/CuO nanoenergetic composites. The results showed that the reactivity of B/CuO nanoenergetic composites was enhanced by approximately 6 times, with a reduction in burn time of about 60%. The exothermic heterogeneous reactions between vapor-phase Mg and the molten B2O3 shell of boron at 500-650°C were found to induce surface modifications and enhance the reactivity of boron particles.
Article
Thermodynamics
Yujie Wang, Erik Hagen, Prithwish Biswas, Haiyang Wang, Michael R. Zachariah
Summary: In this study, composites of Al, B, and Ti with KClO4 were prepared using 3D printing, and their combustion characteristics were studied using high-speed videography and pyrometry. The type of fuel was found to strongly affect the combustion characteristics, with Al forming droplets with Al2O3 caps and coalescing before departing the burning surface, while B and Ti formed fractal-shaped agglomerates. The burning particles' temperatures were determined using color imaging-pyrometry. The differences in combustion characteristics were attributed to the physical properties of the fuels and their corresponding oxides.
COMBUSTION AND FLAME
(2023)
Article
Chemistry, Multidisciplinary
Prithwish Biswas, Yujie Wang, Erik Hagen, Michael R. Zachariah
Summary: The volatility of a high energy density ionic liquid propellant can be manipulated to store a nonflammable fuel and generate flammable vapor species electrochemically. This approach offers the potential for safe fuel storage and simple electrochemically driven fuel metering.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Prithwish Biswas, C. Huy Pham, Michael R. Zachariah
Summary: The addition of Mg vapor to a B2O3 surface can induce a reaction that forms a MgBxOy phase. This reaction leads to the development of dangling bonds and a tensile strain in the B-O bond at the MgBxOy-B2O3 interface, resulting in overall surface expansion. The presence of dangling bonds increases the rate of O2 adsorption and the tensile strain enhances the diffusion flux of adsorbed O2 to the particle core, thus enhancing the reactivity of B particles.
Article
Chemistry, Multidisciplinary
Prithwish Biswas, C. Huy Pham, Michael R. Zachariah
Summary: Recent studies have shown that the addition of metals with a lower free energy of oxidation can improve the energetic performance of boron particles. This study used simulations to investigate the reaction of magnesium vapor with a boron oxide surface. The results revealed that the reaction formed a new phase and induced strain at the interface, which increased the adsorption rate of oxygen and enhanced its diffusion through the surface. This enhanced reactivity of boron particles is attributed to the increased rates of oxygen adsorption and diffusion.
Article
Chemistry, Physical
Umesh Dhumal, Umashankar Erigi, Mukta Tripathy
Summary: This study investigates the structure and phase behavior of polymer-Janus nanorod mixtures using PRISM theory and molecular dynamics simulations. The results show that the system undergoes transitions from depletion-driven contact aggregation to dispersion and then to bridging-driven phase separation. At high Janus nanorod densities, the system exhibits a transition from depletion-driven macrophase separation to dispersion, and then to chemical anisotropy-driven self-assembly.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)