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Janus particles

Bing Han, Wendi Xia, Kaining Liu, Fucong Tian, Ying Chen, Xiaoyan Wang, Fuxin Liang, Zhenzhong Yang
The amphiphilic monomer 2-hydroxyethyl methacrylate (HEMA) is widely used in dental adhesives as a priming component, especially for dentin bonding. It behaves as a compatibilizer between hydrophilic and hydrophobic components, and stabilizes the multi-component adhesive system. However, there are several drawbacks associated with using HEMA, such as water retention within the adhesive layer, hydrolysis in oral environments, and cytotoxicity. These drawbacks lead to the failure of tooth restoration and represent a heavy medical burden...
February 22, 2018: ACS Applied Materials & Interfaces
Peter C Taylor, Joel M Kremer, Paul Emery, Steven H Zuckerman, Giacomo Ruotolo, Jinglin Zhong, Lei Chen, Sarah Witt, Chadi Saifan, Monika Kurzawa, James D Otvos, Margery A Connelly, William L Macias, Douglas E Schlichting, Terence P Rooney, Stephanie de Bono, Iain B McInnes
OBJECTIVES: Lipid profiles are altered by active disease in patients with rheumatoid arthritis (RA) and may be further modified by treatment with Janus kinase inhibitors and other disease-modifying antirheumatic drugs. METHODS: Lipid data were analysed from phase II and III studies of 4 mg (n=997) and 2 mg (n=479) oral baricitinib administered once daily in patients with moderate-to-severe active RA. Lipoprotein particle size and number and GlycA were evaluated with nuclear magnetic resonance in one phase III study...
February 20, 2018: Annals of the Rheumatic Diseases
F Ginot, I Theurkauff, F Detcheverry, C Ybert, C Cottin-Bizonne
A remarkable feature of active matter is the propensity to self-organize. One striking instance of this ability to generate spatial structures is the cluster phase, where clusters broadly distributed in size constantly move and evolve through particle exchange, breaking or merging. Here we propose an exhaustive description of the cluster dynamics in apolar active matter. Exploiting large statistics gathered on thousands of Janus colloids, we measure the aggregation and fragmentation rates and rationalize the resulting cluster size distribution and fluctuations...
February 15, 2018: Nature Communications
Yutaka Takahashi, Mari Kano, Natsu Yanagisawa, Yukishige Kondo
In this article, we have demonstrated a method for producing hollow particles and microcapsules using oil droplets consisting of hydrocarbon oil (styrene) and fluorocarbon oil (perfluoro-n-octane, PFO) in aqueous surfactant (sodium dodecylsulfate, SDS) solutions. Since fluorocarbon oils are immiscible with hydrocarbon oils, the two oils are separated. Emulsions are prepared by stirring styrene/PFO/aqueous SDS solution mixtures at 80 °C. The type of emulsions and the morphology of droplets in the emulsions are observed by light microscope and scanning confocal fluorescence microscope...
January 25, 2018: Journal of Visualized Experiments: JoVE
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No abstract text is available yet for this article.
February 12, 2018: Proceedings of the National Academy of Sciences of the United States of America
Meng-Jiao Zhu, Jian-Bin Pan, Zeng-Qiang Wu, Xiao-Yu Gao, Wei Zhao, Xing-Hua Xia, Jing-Juan Xu, Hong-Yuan Chen
Noble metal nanoparticles are promising catalysts in electrochemical reactions, while understanding the relationship between the structure and reactivity of the particles is important to achieve higher efficiency of electrocatalysis, and promote the development of single-molecule electrochemistry. Herein, we employ electrogenerated chemiluminescence (ECL) to image the catalytic oxidation of luminophore at single Au, Pt and Au-Pt Janus nanoparticles. Compared to monometal, the Janus particle structure exhibited enhanced ECL intensity and stability, indicating better catalytic efficiency...
February 8, 2018: Angewandte Chemie
Midori Teshima, Takahiro Seki, Yukikazu Takeoka
We established a simple method for preparing Janus particles displaying different structural colors using submicron-sized fine silica particles and magnetic nanoparticles composed of Fe3O4. A w/o emulsion is prepared by vortex-stirring a mixed aqueous solution of suspended fine silica particles and magnetic nanoparticles and of hexadecane containing an emulsifier. Subsequent drying of the emulsion on a hot plate using a magnetic stirrer provides a polydisperse particle aggregate displaying two different structural colors according to the ratio of the amount of fine silica particles to the amount of magnetic nanoparticles...
February 6, 2018: Chemical Communications: Chem Comm
Jaideep Katuri, William E Uspal, Juliane Simmchen, Albert Miguel-López, Samuel Sánchez
For natural microswimmers, the interplay of swimming activity and external flow can promote robust directed motion, for example, propulsion against (upstream rheotaxis) or perpendicular to the direction of flow. These effects are generally attributed to their complex body shapes and flagellar beat patterns. Using catalytic Janus particles as a model experimental system, we report on a strong directional response that occurs for spherical active particles in a channel flow. The particles align their propulsion axes to be nearly perpendicular to both the direction of flow and the normal vector of a nearby bounding surface...
January 2018: Science Advances
Tuan Trinh, Chenyi Liao, Violeta Toader, Maciej Barłóg, Hassan S Bazzi, Jianing Li, Hanadi F Sleiman
As colloidal self-assembly increasingly approaches the complexity of natural systems, an ongoing challenge is to generate non-centrosymmetric structures. For example, patchy, Janus or living crystallization particles have significantly advanced the area of polymer assembly. It has remained difficult, however, to devise polymer particles that associate in a directional manner, with controlled valency and recognition motifs. Here, we present a method to transfer DNA patterns from a DNA cage to a polymeric nanoparticle encapsulated inside the cage in three dimensions...
February 2018: Nature Chemistry
Martin Girard, Trung Dac Nguyen, Monica Olvera de la Cruz
Coarse-grained potentials are ubiquitous in mesoscale simulations. While various methods to compute effective interactions for spherically symmetric particles exist, anisotropic interactions are seldom used, due to their complexity. Here we describe a general formulation, based on a spatial decomposition of the density fields around the particles, akin to atomic orbitals. We show that anisotropic potentials can be efficiently computed in numerical simulations using Fourier-based methods. We validate the field formulation and characterize its computational efficiency with a system of colloids that have Gaussian surface charge distributions...
November 2017: Physical Review. E
Chong-Wai Io, Tzu-Yin Chen, Jai-Wei Yeh, Sin-Cen Cai
The mesoscopic collective motion of self-propelling active particle suspension is experimentally investigated. The active particles are silica micro spheres with Au hemisphere coating, and their propelling strength is activated by laser irradiation. The suspension is driven from equilibrium to near equilibrium and far from equilibrium by tuning the excitation laser intensity. By use of the long-term particle tracking technique, the time evolution of a large amount of active particles is resolvable. For low laser intensity, the suspension is driven to near equilibrium state with homogeneous superdiffusion motion...
December 2017: Physical Review. E
Hyeong Jin Chun, Saemi Kim, Yong Duk Han, Dong Woo Kim, Ka Ram Kim, Hyo-Sop Kim, Jae-Ho Kim, Hyun C Yoon
Herein, we report an optical sensing platform for mercury ions (Hg2+) in water based on the integration of Hg2+-mediated thymine-thymine (T-T) stabilization, a biotinylated stem-loop DNA probe, and a streptavidin-modified retroreflective Janus particle (SA-RJP). Two oligonucleotide probes, including a stem-loop DNA probe and an assistant DNA probe, were utilized. In the absence of Hg2+, the assistant DNA probe does not hybridize with the stem-loop probe due to their T-T mismatch, so the surface-immobilized stem-loop DNA probe remains a closed hairpin structure...
January 6, 2018: Biosensors & Bioelectronics
Sergey D Traytak, Denis S Grebenkov
The purpose of this paper is twofold. First, we provide a concise introduction to the generalized method of separation of variables for solving diffusion problems in canonical domains beyond conventional arrays of spheres. Second, as an important example of its application in the theory of diffusion-influenced reactions, we present an exact solution of the axially symmetric problem on diffusive competition in an array of two active particles (including Janus dumbbells) constructed of a prolate spheroid and a sphere...
January 14, 2018: Journal of Chemical Physics
Hao Li, Zhenming Cao, Jiayao Lin, Hui Zhao, Qiaorong Jiang, Zhiyuan Jiang, Honggang Liao, Qin Kuang, Zhaoxiong Xie
Due to their distinctive structure, inherently anisotropic properties and broad applications, Janus colloidal particles have attracted tremendous attention and it is significant to synthesize high yield Janus colloidal particles in a cost-effective and reliable way. On the other hand, due to the expanded electromagnetic interference problems, it is highly desired to develop excellent electromagnetic wave absorbing materials with an ultra-wide absorption bandwidth for practical application. Herein, a confined liquid-solid redox reaction strategy has been developed to fabricate a series of Fex(CoyNi1-y)100-x ternary alloy particles...
January 10, 2018: Nanoscale
Enrico F Semeraro, Rajeev Dattani, Theyencheri Narayanan
The evolution of interactions and dynamics of Janus colloidal particles suspended in quasi-binary liquid mixtures undergoing phase separation is presented. The experimental system consisted of silica-nickel Janus particles dispersed in mixtures of 3-methylpyridine, water, and heavy water. Colloidal microstructure and dynamics were probed by ultra-small-angle X-ray scattering and ultra-small-angle X-ray photon correlation spectroscopy, respectively. The observed static and dynamic behaviors are significantly different from those found for Stöber silica colloids in this mixture...
January 7, 2018: Journal of Chemical Physics
Amir Houshang Bahrami, Thomas R Weikl
Besides direct particle-particle interactions, nanoparticles adsorbed to biomembranes experience indirect interactions that are mediated by the membrane curvature arising from particle adsorption. In this letter, we show that the curvature-mediated interactions of adsorbed Janus particles depend on the initial curvature of the membrane prior to adsorption, i.e. on whether the membrane initially bulges towards or away from the particles in our simulations. The curvature-mediated interaction can be strongly attractive for Janus particles adsorbed to the outside of a membrane vesicle, which initially bulges away from the particles...
December 27, 2017: Nano Letters
Aidin Rashidi, Christopher L Wirth
This article describes the simulated Brownian motion of a sphere comprising hemispheres of unequal zeta potential (i.e., "Janus" particle) very near a wall. The simulation tool was developed and used to assist in the methodology development for applying Total Internal Reflection Microscopy (TIRM) to anisotropic particles. Simulations of the trajectory of a Janus sphere with cap density matching that of the base particle very near a boundary were used to construct 3D potential energy landscapes that were subsequently used to infer particle and solution properties, as would be done in a TIRM measurement...
December 14, 2017: Journal of Chemical Physics
Hyeri Kim, Jangwoo Cho, Jaehong Cho, Bum Jun Park, Jin Woong Kim
We present a straightforward and robust method for the synthesis of Janus colloid surfactants with distinct amphiphilicity and magnetic responsiveness. To this end, hydroxyl-functionalized amphiphilic Janus microparticles are synthesized by seeded monomer swelling and subsequent photo-polymerization. By incorporating controlled amounts of hydroxyl groups on poly (styrene-co-vinyl alcohol) seed particles, we adjust the interfacial tension between the seed polymer and the poly (tetradecyl acrylate) secondary polymer (γ13)...
December 15, 2017: ACS Applied Materials & Interfaces
Amir Nourhani, Daniel Brown, Nicholas Pletzer, John G Gibbs
Artificial self-propelled colloidal particles have recently served as effective building blocks for investigating many dynamic behaviors exhibited by nonequilibrium systems. However, most studies have relied upon excluded volume interactions between the active particles. Experimental systems in which the mobile entities interact over long distances in a well-defined and controllable manner are valuable so that new modes of multiparticle dynamics can be studied systematically in the laboratory. Here, a system of self-propelled microscale Janus particles is engineered to have contactless particle-particle interactions that lead to long-range attraction, short-range repulsion, and mutual alignment between adjacent swimmers...
December 2017: Advanced Materials
Guosheng Song, Min Chen, Yanrong Zhang, Liyang Cui, Haibo Qu, Xianchuang Zheng, Max Wintermark, Zhuang Liu, Jianghong Rao
Iron oxides nanoparticles tailored for magnetic particle imaging (MPI) have been synthesized, and their MPI signal intensity is 3 times of commercial MPI contrast (Ferucarbotran, also called Vivotrax) and 7 times of MRI contrast (Feraheme) at the same Fe concentration. MPI tailored iron oxide nanoparticles were encapsulated with semiconducting polymers to produce Janus nanoparticles that possessed optical and magnetic properties for MPI and fluorescence imaging. Janus particles were applied to cancer cell labeling and in vivo tracking, and as few as 250 cells were imaged by MPI after implantation, corresponding to an amount of 7...
December 12, 2017: Nano Letters
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