Article
Chemistry, Physical
Arabinda Bera, Kurt Binder, Sergei A. Egorov, Subir K. Das
Summary: Based on molecular dynamics simulations, this study examines the structure and dynamics of mixtures of active colloids and passive polymers confined in a repulsive boundary spherical container. By introducing velocity-aligning activity to the colloids, the shape of the polymer-rich domain transitions to an ellipsoid, while the colloid-rich domain develops a macroscopic angular momentum around the long axis. The orientation of this axis evolves through diffusion in the steady state, with the magnitude depending weakly on the activity strength.
Article
Optics
Shoujun Zhang, Xieyu Chen, Kuan Liu, Haiyang Li, Yuehong Xu, Xiaohan Jiang, Yihan Xu, Qingwei Wang, Tun Cao, Zhen Tian
Summary: This article introduces a nonvolatile, reconfigurable, and dynamic Janus metasurface using phase-change material Ge2Se2Te5 (GST) in the terahertz (THz) regime. The reversible switching characteristic of GST on large areas is demonstrated, and a multiplex metasurface scheme is proposed. Various applications such as dynamic beam splitter, bifocal metalens, and switchable metalens/focusing optical vortex generators are designed and experimentally characterized. The development of multifunctional and compact THz devices can be facilitated by this scheme.
PHOTONICS RESEARCH
(2022)
Article
Engineering, Environmental
Da Huang, Qiujie Meng, Yixiang Song, Dongming Gu, Jianbing Peng, Zhu Zhong
Summary: The mechanical behaviors of ice-rich debris (IRD) under freezing and thawing conditions were studied. The degradation of IRD mechanical performance caused by thawing is considered a major cause of rock-ice avalanches. A new variable, the thawing ratio, was used to evaluate the amount of ice melting. Direct shear tests on IRD specimens were conducted under different thawing ratios, initial ice contents, and normal stresses. The results showed that lower initial ice contents make IRD more sensitive to temperature rise and the shear strength of IRD decreases linearly with increasing thawing ratio.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Hossein Eslami, Florian Mueller-Plathe
Summary: The self-assembly of triblock Janus particles and the relative stability of different lattices were simulated. The nucleation process consists of two steps: the formation of a compact and disordered liquid cluster, followed by the reorientation of particles to form crystalline nuclei. The nucleation barriers for pyrochlore and perovskite were similar to previously studied 2D kagome lattices, while the barrier for diamond was larger.
Article
Chemistry, Physical
Patrick A. Bonnaud, Hiroshi Ushiyama, Syogo Tejima, Jun-Ichi Fujita
Summary: The study investigated the nano-rheological properties of polyelectrolytes and found that systems containing polyelectrolytes exhibit shear thickening, with molecular configurations being disrupted and more clusters with smaller sizes appearing as shear rate increases. This shear thickening originates from an increase in intramolecular and van der Waals interactions resulting from the difficulty of polyelectrolyte-based systems to relax at high shear rates, highlighting the importance of considering molecular scale in designing materials that efficiently absorb impact energy.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Chemistry, Physical
Laura Dal Compare, Flavio Romano, Jared A. Wood, Asaph Widmer-Cooper, Achille Giacometti
Summary: The phase diagram of hard helices is different from that of hard rods due to the presence of chiral screw phases. The addition of short-range attractive interactions to a fraction of the sites forming the hard helices results in different temperature regimes. The location of the transition lines does not have a simple dependence on the fraction of attractive beads.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Jichuan Qiu, Zitao Chen, Miaofang Chi, Younan Xia
Summary: A versatile route to the fabrication of well-controlled Janus particles by breaking the symmetry of spherical particles with swelling is reported. Janus particles are comprised of two distinct components: one made of PS and the other comprised of a rigid shell and remaining PS. This solution-based route holds promise for scalable production of complex Janus particles with a variety of compositions and in large quantities.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
Khaoula Lebdioua, Manuella Cerbelaud, Anne Aimable, Arnaud Videcoq
Summary: This paper introduces the synthesis of silica-based Janus particles and their behavior in suspension, showing that the aggregation of these particles can be tuned by modifying experimental parameters, making them promising for building new ceramic materials.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Mechanics
Colin Leclercq, Denis Sipp
Summary: This paper introduces a new operator called the mean resolvent R-0, which is relevant in input-output analysis of flows. The operator provides the statistically optimal linear time-invariant approximation of the input-output dynamics, particularly in flow control applications. The theory is developed for the periodic case, and the poles of the operator correspond to the Floquet exponents of the system.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Chemistry, Physical
J. D. Torrenegra-Rico, A. Arango-Restrepo, J. M. Rubi
Summary: In this study, the energetic cost of formation of Janus particle structures is computed using an approach that couples particle dynamics to the evolution of fuel concentration in the medium. Different types of structures are shown to emerge, and the energy dissipated in their formation is obtained from the entropy production rate. Analyzing the free energy of these particles allows for the establishment of a thermodynamic criterion for structure formation based on the behavior of chemical potential.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Engineering, Environmental
Jingjing Pan, Boxin Wang, Qing Wang, Xianzhang Ling, Jiaqi Liu, Ruichang Fang, Zihao Wang
Summary: Direct shear tests were conducted to analyze the mechanical and deformation characteristics of the silty clay-concrete interface under freeze-thaw cycles and different moisture contents. The change in shear band thickness under freeze-thaw cycles was studied using particle image velocimetry technology, and the microstructure changes were observed through scanning electron microscopy. Results showed that the shear strength of the interface decreased with an increase in freeze-thaw cycles and moisture content. The thickness of the shear band increased until stabilization after three freeze-thaw cycles.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2023)
Article
Optics
Benwen Chen, Shengxin Yang, Jian Chen, Jingbo Wu, Ke Chen, Weili Li, Yihui Tan, Zhaosong Wang, Hongsong Qiu, Kebin Fan, Caihong Zhang, Huabing Wang, Yijun Feng, Yunbin He, Biaobing Jin, Xinglong Wu, Jian Chen, Peiheng Wu
Summary: Thermally activated Janus metasurfaces with phase change materials can produce designed phase delays, enabling reconfigurable THz Janus metasurfaces. This allows for asymmetric focusing of THz waves and directional THz holography with free-space image projections, and the information can be manipulated via temperature and incident THz wave direction. This research offers a common strategy for the reconfigurability of Janus metasurfaces and has potential applications in THz optical information encryption, data storage, and smart windows.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Environmental Sciences
Caroline Fiorio Grilo, Arthur Sant'Ana Cavichini, Marcos Tadeu D'Azeredo Orlando, Alex Cardoso Bastos, Kyssyanne Samihra Santos Oliveira, Livia Rodrigues Garcez, Mayara Bandeira, Adeildo Costa Junior, Anita Ruschi, Karen Fadini, Flavia Garonce, Rafael Carvalho Neves, Danielle Peron D'Agostini, Fabian Sa, Valeria da Silva Quaresma
Summary: After the Fundao iron ore mining dam rupture in November 2015, yellow/ocher emulsions were observed on the continental shelf adjacent to the Doce River, composed of nanoparticles of iron oxyhydroxide. Analysis revealed the presence of micelles made up of these nanoparticles enveloped by organic polymers, which may act as a self-assembly template seed after losing water. This study highlighted the distinct behavior of tailings material compared to clay minerals previously found in suspended particulate material before the dam rupture.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Energy & Fuels
Il Woong Park, Jia Yu, Sang Min Song, Yeon-Gun Lee
Summary: Although hydrogen is a promising material for global energy transportation, its leakage or generation in enclosed spaces can cause explosion hazards, including nuclear power plants. To manage these risks, it is important to understand the characteristics of hydrogen dispersion in air and its stratification behavior. This study investigated the distribution of hydrogen in an enclosed vessel under steam-condensing conditions using helium as a substitute. The experiments included steady-state and transient tests to observe the impact of helium injection and subsequent redistribution.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Physics, Fluids & Plasmas
Jeanne Decayeux, Vincent Dahirel, Marie Jardat, Pierre Illien
Summary: This study introduces a model to explore the motion characteristics of isotropic colloids interacting with solute particles in the environment. The interactions lead to a spontaneous phase transition near the colloid, resulting in directed motion and enhanced diffusion over long timescales.
Article
Mechanics
Misael Diaz-Maldonado, Ubaldo M. Cordova-Figueroa
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2016)
Article
Chemistry, Multidisciplinary
Ronal A. DeLaCruz-Araujo, Daniel J. Beltran-Villegas, Ronald G. Larson, Ubaldo M. Cordova-Figueroa
Article
Chemistry, Multidisciplinary
Rahul Mangal, Karthik Nayani, Young-Ki Kim, Emre Bukusoglu, Ubaldo M. Cordova-Figueroa, Nicholas. L. Abbott
Article
Chemistry, Multidisciplinary
Xi Zhao, Krishna K. Dey, Selva Jeganathan, Peter J. Butler, Ubaldo M. Cordova-Figueroa, Ayusman Sen
Article
Chemistry, Multidisciplinary
Thomas W. Long, Ubaldo M. Cordova-Figueroa, Ilona Kretzschmar
Article
Chemistry, Multidisciplinary
Karthik Nayani, Ubaldo M. Cordova-Figueroa, Nicholas L. Abbott
Article
Chemistry, Physical
Jonathan A. Victoria-Camacho, Ronal A. DeLaCruz-Araujo, Ilona Kretzschmar, Ubaldo M. Cordova-Figueroa
Article
Chemistry, Physical
Gabriel I. Vega-Bellido, Ronal A. DeLaCruz-Araujo, Ilona Kretzschmar, Ubaldo M. Cordova-Figueroa
Article
Physics, Fluids & Plasmas
Glenn C. Vidal-Urquiza, Ubaldo M. Cordova-Figueroa
Meeting Abstract
Chemistry, Multidisciplinary
Ronal DeLaCruz-Araujo, Daniel Beltran-Villegas, Ron Larson, Ubaldo Cordova-Figueroa
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2017)
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.