Artigos de revistas: "Cylindre Janus"

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Liu, Volker Abetz e Axel H. E. Müller. "Janus Cylinders". Macromolecules 36, n.º 21 (outubro de 2003): 7894–98. http://dx.doi.org/10.1021/ma0345551.

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Zhang, Kai, Fu-Zhen Tian e Ming-Zhou Yu. "Induced-charge electroosmosis around conducting and Janus cylinder in microchip". Thermal Science 16, n.º 5 (2012): 1502–5. http://dx.doi.org/10.2298/tsci1205502z.

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The induced-charge elecetroosmosis around conducting/Janus cylinder with arbitrary Debye thickness is studied numerically, when an direct current weak electric filed is suddenly applied in a confined microchannel. It?s found that there are four large circulations around the conducting cylinder, and the total flux in the microchannel is zero; there are two smaller circulations around the Janus cylinder, and they are compressed to wall. A bulk flux, which has a parabolic relation with the applied electric field, is also predicted.

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Janssens, Stoffel D., Vikash Chaurasia e Eliot Fried. "Effect of a surface tension imbalance on a partly submerged cylinder". Journal of Fluid Mechanics 830 (29 de setembro de 2017): 369–86. http://dx.doi.org/10.1017/jfm.2017.537.

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We perform a static analysis of a circular cylinder that forms a barrier between surfactant-laden and surfactant-free portions of a liquid–gas interface. In addition to determining the general implications of the balances for forces and torques, we quantify how the imbalance $\unicode[STIX]{x0394}\unicode[STIX]{x1D6FE}=\unicode[STIX]{x1D6FE}_{a}-\unicode[STIX]{x1D6FE}_{b}$ between the uniform surface tension $\unicode[STIX]{x1D6FE}_{a}$ of the surfactant-free portion of the interface and the uniform surface tension $\unicode[STIX]{x1D6FE}_{b}$ of the surfactant-laden portion of the interface influences the load-bearing capacity of a hydrophobic cylinder. Moreover, we demonstrate that the difference between surface tensions on either side of a cylinder with a cross-section of arbitrary shape induces a horizontal force component $f^{h}$ equal to $\unicode[STIX]{x0394}\unicode[STIX]{x1D6FE}$ in magnitude, when measured per unit length of the cylinder. With an energetic argument, we show that this relation also applies to a rod-like barrier with cross-sections of variable shape. In addition, we apply our analysis to amphiphilic Janus cylinders and we discuss practical implications of our findings for Marangoni propulsion and surface pressure measurements.

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Castiñeira-Ibañez, Sergio, Daniel Tarrazó-Serrano, Antonio Uris e Constanza Rubio. "Tunable acoustic hooks from Janus cylinder". Results in Physics 24 (maio de 2021): 104134. http://dx.doi.org/10.1016/j.rinp.2021.104134.

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Zhang, Kai, Xiao-Jing Mi e Ming-Zhou Yu. "Design of super-efficient mixer based on induced charge electroosmotic". Thermal Science 16, n.º 5 (2012): 1534–38. http://dx.doi.org/10.2298/tsci1205534z.

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The super-efficient sample mixing induced by the induced-charge electrokinetic flow around conducting/Janus cylinder was numerically studied in a confined |U-shaped microchannel with suddenly applied DC weak electric filed. It?s found that there are four large circulations around the conducting cylinder and two smaller circulations around the Janus cylinder. The results show that samples can still be well mixed with high flux due to the induced electroosmosis. It is demonstrated that the local flow circulations provide effective means to enhance the flow mixing between different solutions. The dependence of the degree of mixing enhancement on the electric field is also predicted.

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Steinhaus, Andrea, Deepika Srivastva, Arash Nikoubashman e André H. Gröschel. "Janus Nanostructures from ABC/B Triblock Terpolymer Blends". Polymers 11, n.º 7 (30 de junho de 2019): 1107. http://dx.doi.org/10.3390/polym11071107.

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Lamella-forming ABC triblock terpolymers are convenient building blocks for the synthesis of soft Janus nanoparticles (JNPs) by crosslinking the B domain that is “sandwiched” between A and C lamellae. Despite thorough synthetic variation of the B fraction to control the geometry of the sandwiched microphase, so far only Janus spheres, cylinders, and sheets have been obtained. In this combined theoretical and experimental work, we show that the blending of polybutadiene homopolymer (hPB) into lamella morphologies of polystyrene-block-polybutadiene-block-polymethylmethacrylate (SBM) triblock terpolymers allows the continuous tuning of the polybutadiene (PB) microphase. We systematically vary the volume fraction of hPB in the system, and we find in both experiments and simulations morphological transitions from PB-cylinders to perforated PB-lamellae and further to continuous PB-lamellae. Our simulations show that the hPB is distributed homogeneously in the PB microdomains. Through crosslinking of the PB domain and redispersion in a common solvent for all blocks, we separate the bulk morphologies into Janus cylinders, perforated Janus sheets, and Janus sheets. These studies suggest that more complex Janus nanostructures could be generated from ABC triblock terpolymers than previously expected.

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Oratis, Alexandros T., Timothy P. Farmer e James C. Bird. "Capillary induced twisting of Janus cylinders". Soft Matter 13, n.º 41 (2017): 7556–61. http://dx.doi.org/10.1039/c7sm01288h.

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Ruhland, Thomas M., André H. Gröschel, Andreas Walther e Axel H. E. Müller. "Janus Cylinders at Liquid–Liquid Interfaces". Langmuir 27, n.º 16 (16 de agosto de 2011): 9807–14. http://dx.doi.org/10.1021/la201863x.

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Liu, Weiyu, Ye Tao, Yaoyao Chen, Zhenyou Ge, Junshuo Chen e Yanbo Li. "Developing an Active Microfluidic Pump and Mixer Driven by AC Field-Effect-Mediated Induced-Charge Electro-Osmosis of Metal–Dielectric Janus Micropillars: Physical Perspective and Simulation Analysis". Applied Sciences 13, n.º 14 (16 de julho de 2023): 8253. http://dx.doi.org/10.3390/app13148253.

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We propose herein a novel microfluidic approach for the simultaneous active pumping and mixing of analytes in a straight microchannel via the AC field-effect control of induced-charge electro-osmosis (ICEO) around metal–dielectric solid Janus cylinders of inherent inhomogeneous electrical polarizability immersed in an electrolyte solution. We coin the term “Janus AC flow field-effect transistor (Janus AC-FFET)” to describe this interesting physical phenomenon. The proposed technique utilizes a simple device geometry, in which one or a series of Janus microcylinders are arranged in parallel along the centerline of the channel’s bottom surface, embedding a pair of 3D sidewall driving electrodes. By combining symmetry breaking in both surface polarizability and the AC powering scheme, it is possible, on demand, to adjust the degree of asymmetry of the ICEO flow profile in two orthogonal directions, which includes the horizontal pump and transversal rotating motion. A comprehensive mathematical model was developed under the Debye–Hückel limit to elucidate the physical mechanism underlying the field-effect-reconfigurable diffuse-charge dynamics on both the dielectric and the metal-phase surfaces of the Janus micropillar. For innovation in applied science, an advanced microdevice design integrating an array of discrete Janus cylinders subjected to two oppositely polarized gate terminals is recommended for constructing an active microfluidic pump and mixer, even without external moving parts. Supported by a simulation analysis, our physical demonstration of Janus AC-FFET provides a brand-new approach to muti-directional electro-convective manipulation in modern microfluidic systems.

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Choi, Woorak, e Sungchan Yun. "Behavior of Compound Materials on Superhydrophobic Cylinders: Effects of Droplet’s Size and Interface Angle". Korean Journal of Metals and Materials 62, n.º 3 (5 de março de 2024): 222–28. http://dx.doi.org/10.3365/kjmm.2024.62.3.222.

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Compound droplets can consist of two or more immiscible substances sharing an interface. Among such droplets, the low-viscosity component of Janus droplets can exhibit peculiar bouncing behavior on nonwettable surfaces. There have been recent advances in droplet control technologies, however the impact dynamics of droplets on complex surfaces, and strategies to control their behavior, have not been extensively studied. This study employs the volume of fluid method to analyze the effects of Janus droplet size and the initial interface angle on the dynamics of the two fluidic components in droplets on superhydrophobic cylinders. Janus droplets are composed of low-viscosity (W-) and high-viscosity liquid (G-component). The dynamic characteristics of Janus droplets are investigated as a function of Weber number (<i>We</i>), initial interface angle, the ratio of the droplet’s diameter to the cylinder’s diameter, and viscosity ratio (α). Numerical models provide a regime map of the separation ratio of Janus droplets based on We and α, and the influence of droplet size on asymmetric bouncing is discussed. This study also examines the threshold We at which separation begins after impact, varying with droplet size and α. In addition, the shape evolutions of the droplets are discussed for various initial interface angles to understand the bouncing behavior and separation efficiency. This study is expected to provide valuable strategies for controlling droplet behavior and separation in applications such as liquid purification, rheology, and solidification.

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Walther, Andreas, Markus Drechsler, Sabine Rosenfeldt, Ludger Harnau, Matthias Ballauff, Volker Abetz e Axel H. E. Müller. "Self-Assembly of Janus Cylinders into Hierarchical Superstructures". Journal of the American Chemical Society 131, n.º 13 (8 de abril de 2009): 4720–28. http://dx.doi.org/10.1021/ja808614q.

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Arslanova, Alina, Venkateshwar Rao Dugyala, Erwin Konrad Reichel, Naveen Reddy, Jan Fransaer e Christian Clasen. "‘Sweeping rods’: cargo transport by self-propelled bimetallic microrods moving perpendicular to their long axis". Soft Matter 17, n.º 9 (2021): 2369–73. http://dx.doi.org/10.1039/d1sm00042j.

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We report for the first time on a much more effective one-by-one microscopic cargo collection and transport by sideways propelled Janus cylinders, which eventually results in pyramidical shaped micro-rod-cargo aggregates.

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Kim, Jongmin, Myung Seok Oh, Chang-Hyung Choi, Sung-Min Kang, Moo Jin Kwak, Jae Bem You, Sung Gap Im e Chang-Soo Lee. "Three-dimensional clustering of Janus cylinders by convex curvature and hydrophobic interactions". Soft Matter 11, n.º 24 (2015): 4952–61. http://dx.doi.org/10.1039/c5sm00734h.

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Zhang, Kai, Xiaojing Mi e Bingying Sheng. "Design of T-Shaped Micropump Based on Induced Charge Electroosmotic". Abstract and Applied Analysis 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/386085.

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The fluid-driven efficiency of the micropump based on induced charge electroosmotic was studied by numerical simulation method. In this paper, we propose to make some improvement against the T-shaped piping design of micropump, and we embed a janus cylinder in the junction of the T-shaped pipe for the micropump design. We offer different voltage to the inlet of the pipe and carry out the numerical study of the fluid field induced by the cylinder, and the comparison of the velocity and flux of the outlet in different voltage as carried out. It is found that there are two symmetrical circulations around the polarizable side of the cylinder. And the comparison results show that the flow and the velocity of the outlet were increased with the increasing voltage of the entrance.

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Park, Bum Jun, Chang-Hyung Choi, Sung-Min Kang, Kwadwo E. Tettey, Chang-Soo Lee e Daeyeon Lee. "Double Hydrophilic Janus Cylinders at an Air–Water Interface". Langmuir 29, n.º 6 (31 de janeiro de 2013): 1841–49. http://dx.doi.org/10.1021/la304829s.

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Kim, Jongmin, Chang-Hyung Choi, Su-Jin Yeom, Naye Eom, Kyoung-Ku Kang e Chang-Soo Lee. "Directed Assembly of Janus Cylinders by Controlling the Solvent Polarity". Langmuir 33, n.º 30 (21 de julho de 2017): 7503–11. http://dx.doi.org/10.1021/acs.langmuir.7b01252.

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17

Liu, Weiyu, Yukun Ren, Ye Tao, Hui Yan, Congda Xiao e Qisheng Wu. "Buoyancy-Free Janus Microcylinders as Mobile Microelectrode Arrays for Continuous Microfluidic Biomolecule Collection within a Wide Frequency Range: A Numerical Simulation Study". Micromachines 11, n.º 3 (10 de março de 2020): 289. http://dx.doi.org/10.3390/mi11030289.

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We numerically study herein the AC electrokinetic motion of Janus mobile microelectrode (ME) arrays in electrolyte solution in a wide field frequency, which holds great potential for biomedical applications. A fully coupled physical model, which incorporates the fluid-structure interaction under the synergy of induced-charge electroosmotic (ICEO) slipping and interfacial Maxwell stress, is developed for this purpose. A freely suspended Janus cylinder free from buoyancy, whose main body is made of polystyrene, while half of the particle surface is coated with a thin conducting film of negligible thickness, will react actively on application of an AC signal. In the low-frequency limit, induced-charge electrophoretic (ICEP) translation occurs due to symmetric breaking in ICEO slipping, which renders the insulating end to move ahead. At higher field frequencies, a brand-new electrokinetic transport phenomenon called “ego-dielectrophoresis (e-DEP)” arises due to the action of the localized uneven field on the inhomogeneous particle dipole moment. In stark contrast with the low-frequency ICEP translation, the high-frequency e-DEP force tends to drive the asymmetric dipole moment to move in the direction of the conducting end. The bidirectional transport feature of Janus microspheres in a wide AC frequency range can be vividly interpreted as an array of ME for continuous loading of secondary bioparticles from the surrounding liquid medium along its direction-controllable path by long-range electroconvection. These results pave the way for achieving flexible and high-throughput on-chip extraction of nanoscale biological contents for subsequent on-site bioassay based upon AC electrokinetics of Janus ME arrays.

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Dupont, John, e Guojun Liu. "ABC triblock copolymer hamburger-like micelles, segmented cylinders, and Janus particles". Soft Matter 6, n.º 15 (2010): 3654. http://dx.doi.org/10.1039/c0sm00044b.

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Fritz, Gerhard, e Alexander Bergmann. "Interpretation of small-angle scattering data of inhomogeneous ellipsoids". Journal of Applied Crystallography 37, n.º 5 (11 de setembro de 2004): 815–22. http://dx.doi.org/10.1107/s0021889804017959.

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Small-angle scattering data of inhomogeneous ellipsoidal particles are discussed in terms of their pair distance distribution functionsp(r). Special attention is given to the determination of core and shell thicknesses and axis ratios as well as to large distances within the particles, since cross terms between parts of positive and negative contrast within the particle can produce misleading results, similar to homogeneous particles or Janus particles. Cross-section pair distance distribution functionspc(r) of cylinders with elliptical cross sections show similar behaviour. Theoretical calculations are compared with small-angle X-ray and neutron scattering (SAXS and SANS) data of cetyltrimethylammonium bromide in aqueous KCl solutions.

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Rosi, Paolo, Gian Carlo Gazzadi, Stefano Frabboni, Vincenzo Grillo, Amir H. Tavabi, Rafal E. Dunin-Borkowski e Giulio Pozzi. "Focused ion beam fabrication of Janus bimetallic cylinders acting as drift tube Zernike phase plates for electron microscopy". Journal of Applied Physics 130, n.º 2 (14 de julho de 2021): 024507. http://dx.doi.org/10.1063/5.0050055.

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Jamiołkowski, Andrzej. "Powrót do (już) nie swojego domu. Analiza porównawcza „Powrotu z gwiazd” Stanisława Lema i „Cylindra Van Troffa” Janusza A. Zajdla". Bibliotekarz Podlaski Ogólnopolskie Naukowe Pismo Bibliotekoznawcze i Bibliologiczne 52, n.º 3 (13 de dezembro de 2021): 107–24. http://dx.doi.org/10.36770/bp.625.

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The article is an attempt at a comparative analysis of the novels: Return from the Stars by Stanisław Lem and Van Troff’s Cylinder by Janusz A. Zajdel. Both works belonging to Polish science fiction present visions of humanity in the future. Despite obvious differences (both novels were written in different circumstances, one novel is a dystopia, the other an anti-utopia) it is possible to find areas common to both works representing the Polish science fiction genre. The novels present a pessimistic vision of humanity in the future. The greatest similarity, however, can be observed in the creation of the main characters, who experience culture shock when faced with a new vision of human society. The protagonists find themselves confused, discordant and despairing. They see that the changes have gone in the wrong direction. But it is too late for them to do anything about it, except for accepting this reality or trying to escape from it back into the stars.

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Sheng, Yuping, Xiaoping Yang, Nan Yan e Yutian Zhu. "Janus-like spheres, disks, rings, cylinders, and vesicles from the self-assembly of mixture of AB and BC diblock copolymers in A- and C-selective solvents". Soft Matter 9, n.º 27 (2013): 6254. http://dx.doi.org/10.1039/c3sm00029j.

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Reshetnyak, T. M., E. A. Aseeva, A. A. Shumilova, N. Yu Nikishina, S. Yu Shkireeva e A. M. Lila. "Portrait of a patient with systemic lupus erythematosus for the prescription of the type I interferon inhibitor anifrolumab". Modern Rheumatology Journal 17, n.º 6 (16 de dezembro de 2023): 14–21. http://dx.doi.org/10.14412/1996-7012-2023-6-14-21.

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In recent years the use of monoclonal antibodies that block activity of type I interferon (IFN) or its receptors has become the new approach in the pharmacotherapy of systemic lupus erythematosus (SLE).Objective: to characterize patients with SLE treated with the type I IFN receptor inhibitor anifrolumab (AFM, Saphnelo®).Material and methods. The prospective 12-month study included 21 patients with SLE who met the 2012 SLICC criteria. Standard laboratory and immunological markers for SLE were examined in all patients. The SLEDAI-2K index was used to determine the activity of SLE and the CLASI index was used to determine the severity of the mucocutaneous syndrome. Organ damage was assessed using the SLICC/ACR Damage Index (DI). The LupusQol and FACIT-Fatigue questionnaires were used to analyze health-related quality of life (HRQoL).Results and discussion. Female patients prevailed in the study, female/male ratio – 17 (81%)/4 (19%), median age – 31 [27; 46] years, disease duration – 9 [6.0; 11.0] years. The majority of patients (86%) had moderate or high disease activity according to the SLEDAI-2K index. Among the clinical manifestations of SLE, skin and mucous membranes lesions predominated (81%). Non-erosive polyarthritis of varying severity was observed in 66% of cases. Serositis showed 24% of patients (pleurisy, pericarditis), 43% had hematological abnormalities (hemolytic anemia, leukopenia, lymphopenia) and 14% - urinary syndrome (daily proteinuria up to 0.5 g/l and/or urinary sediment – leukocytes/erythrocytes/cylinders up to 5 in the field of view in the absence of urinary tract infection). All patients had immunological disorders. 14% of them were diagnosed with antiphospholipid syndrome (APS) and 43% with Sjögren's syndrome.All patients received hydroxychloroquine, 95% received glucocorticoids (GC) from 5 to 60 mg/day, 66% received immunosuppressants (cyclophosphamide, mycophenolate mofetil, azathioprine, methotrexate). 33% of patients had anamnesis of treatment with biologic disease modifying antirheumatic drugs (rituximab, belimumab, dual anti-B-cell therapy) and Janus kinase inhibitor baricitinib. All patients experienced a significant deterioration in HRQoL.Conclusion. The indications for prescribing AFM to 21 patients with SLE were: active SLE according to SLEDAI-2K and/or CLASI with predominant involvement of skin, its appendages and development of polyarthritis with immunological disorders, intolerance/ineffectiveness of previous standard therapy and inability to achieve low average daily doses of oral GCs. Other clinical manifestations in some patients were: serositis, mild hematological disorders (Coombs-positive anemia, leukopenia), urinary syndrome. AFM could be prescribed for a combination of SLE with secondary APS and Sjögren's syndrome as well as for a high DI SLICC.

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Arslanova, A., G. Natale, S. Fransen, N. Reddy, C. Clasen e J. Fransaer. "Thermocapillary motion of a solid cylinder near a liquid–gas interface: Janus geometry". Physics of Fluids 36, n.º 4 (1 de abril de 2024). http://dx.doi.org/10.1063/5.0195502.

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In this work, an analytical model is developed for the thermocapillary propulsion of a solid cylinder near a convective liquid–gas interface. Thermocapillarity originates from the temperature-induced surface tension gradients at the liquid–gas interface when the surface temperature of a cylinder residing near the interface differs from the liquid phase. In this work, we consider Janus cylinders with piece-wise constant surface temperatures or heat fluxes. In the former case, we addressed the Gibbs' phenomenon induced by the points of discontinuity. The developed procedure allowed us to study the dynamics of the general case of cylinders with different surface ratios of piece-wise constant temperatures and find the configurations inducing the largest velocities. Most Janus configurations result in motion of the cylinder parallel to the liquid–gas interface. The efficiency of the propulsion parallel to the liquid–gas interface is of the same order of magnitude as the propulsion efficiency of an isotropic cylinder normal to the interface. Considering the emerging interest of scientific community in mechanisms beyond the catalytically induced propulsion, this study may help to shed light on new ways to modulate the propulsion.

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Han, Shuaiyuan, Sandrine Pensec, Dijwar Yilmaz, Cédric Lorthioir, Jacques Jestin, Jean-Michel Guigner, Frédérick Niepceron et al. "Straightforward preparation of supramolecular Janus nanorods by hydrogen bonding of end-functionalized polymers". Nature Communications 11, n.º 1 (21 de setembro de 2020). http://dx.doi.org/10.1038/s41467-020-18587-2.

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Abstract Janus cylinders are one-dimensional colloids that have two faces with different compositions and functionalities, and are useful as building blocks for advanced functional materials. Such anisotropic objects are difficult to prepare with nanometric dimensions. Here we describe a robust and versatile strategy to form micrometer long Janus nanorods with diameters in the 10-nanometer range, by self-assembly in water of end-functionalized polymers. The Janus topology is not a result of the phase segregation of incompatible polymer arms, but is driven by the interactions between unsymmetrical and complementary hydrogen bonded stickers. Therefore, even compatible polymers can be used to form these Janus objects. In fact, any polymers should qualify, as long as they do not prevent co-assembly of the stickers. To illustrate their applicative potential, we show that these Janus nanorods can efficiently stabilize oil-in-water emulsions.

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Barandagh, Ali Rezaei, Adel Rezaei Barandagh e Jafar Ghazanfarian. "Hybrid Heat Transfer Augmentation from Oscillating Cylinder with Partial Superhydrophobic Janus Surfaces". Heat Transfer Engineering, 30 de dezembro de 2022, 1–25. http://dx.doi.org/10.1080/01457632.2022.2162014.

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Nakanishi, Yusuke, Shinpei Furusawa, Yuta Sato, Takumi Tanaka, Yohei Yomogida, Kazuhiro Yanagi, Wenjin Zhang et al. "Structural Diversity of Single‐Walled Transition Metal Dichalcogenide Nanotubes Grown via Template Reaction". Advanced Materials, 5 de outubro de 2023. http://dx.doi.org/10.1002/adma.202306631.

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AbstractMonolayers of transition metal dichalcogenides (TMDs) are an ideal 2D platform for studying a wide variety of electronic properties and potential applications due to their chemical diversity. Similarly, single‐walled TMD nanotubes (SW‐TMDNTs)—seamless cylinders of rolled‐up TMD monolayers—are 1D materials that can exhibit tunable electronic properties depending on both their chirality and composition. However, much less has been explored about their geometrical structures and chemical variations due to their instability under ambient conditions. Here, the structural diversity of SW‐TMDNTs templated by boron nitride nanotubes (BNNTs) is reported. The outer surfaces and inner cavities of the BNNTs promote and stabilize the coaxial growth of SW‐TMDNTs with various diameters, including few‐nanometers‐wide species. The chiral indices (n,m) of individual SW‐MoS2NTs are assigned by high‐resolution transmission electron microscopy, and statistical analyses reveals a broad chirality distribution ranging from zigzag to armchair configurations. Furthermore, this methodology can be applied to the synthesis of various TMDNTs, such as selenides and alloyed Mo1−xWxS2. Comprehensive microscopic and spectroscopic analyses also suggest the partial formation of Janus MoS2(1−x)Se2x nanotubes. The BNNT‐templated reaction provides a universal platform to characterize the chirality‐dependent properties of 1D nanotubes with various electronic structures.

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