Academic literature on the topic 'Self-diffusion and self-propulsion'

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Journal articles on the topic "Self-diffusion and self-propulsion"

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Zhao, Guanjia, Emma J. E. Stuart, and Martin Pumera. "Enhanced diffusion of pollutants by self-propulsion." Physical Chemistry Chemical Physics 13, no. 28 (2011): 12755. http://dx.doi.org/10.1039/c1cp21237k.

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Jurado Romero, Arnau, Carles Calero, and Rossend Rey. "Enhancement of swimmer diffusion through regular kicks: analytic mapping of a scale-independent parameter space." Journal of Statistical Mechanics: Theory and Experiment 2024, no. 6 (2024): 063201. http://dx.doi.org/10.1088/1742-5468/ad4024.

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Abstract Depending on their mechanism of self-propulsion, active particles can exhibit time-dependent, often periodic, propulsion velocity. The precise propulsion velocity profile determines their mean square displacement and their effective diffusion coefficient at long times. Here, we demonstrate that any periodic propulsion profile results in a larger diffusion coefficient than the corresponding case with constant propulsion velocity. We investigate, in detail, periodic exponentially decaying velocity pulses, expected in propulsion mechanisms based on sudden absorption of finite amounts of
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Wang, Xin, Zhongju Ye, Shen Lin, Lin Wei, and Lehui Xiao. "Nanozyme-Triggered Cascade Reactions from Cup-Shaped Nanomotors Promote Active Cellular Targeting." Research 2022 (June 21, 2022): 1–15. http://dx.doi.org/10.34133/2022/9831012.

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Self-propelled nanomotors have shown enormous potential in biomedical applications. Herein, we report on a nanozyme-powered cup-shaped nanomotor for active cellular targeting and synergistic photodynamic/thermal therapy under near-infrared (NIR) laser irradiation. The nanomotor is constructed by the asymmetric decoration of platinum nanoparticles (PtNPs) at the bottom of gold nanocups (GNCs). PtNPs with robust peroxidase- (POD-) like activity are employed not only as propelling elements for nanomotors but also as continuous O2 generators to promote photodynamic therapy via catalyzing endogenou
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Chen, Shuai, Zhi Zhang, Yu Zhang, and Yong Sha. "A three-dimensional multiphase numerical model for the influence of Marangoni convection on Marangoni self-driven object." Physics of Fluids 34, no. 4 (2022): 043308. http://dx.doi.org/10.1063/5.0082893.

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By means of coordinate transformation and the volume-of-fluid-level set multiphase flow method, a three-dimensional multiphase numerical model is established to simulate a Marangoni self-driven object. The forces on the Marangoni self-driven object are discussed as the driving force, viscous resistance, and pressure resistance. A typical disk-shaped, Marangoni self-driven object driven by the diffusion of camphor from its tail to water is utilized to perform a numerical study. Its motion evolution and force change in the whole process are represented quantitatively alongside the flow field and
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Feng, Mudong, and Michael K. Gilson. "A Thermodynamic Limit on the Role of Self-Propulsion in Enhanced Enzyme Diffusion." Biophysical Journal 116, no. 10 (2019): 1898–906. http://dx.doi.org/10.1016/j.bpj.2019.04.005.

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Popescu, Mihail N., and Szilveszter Gáspár. "Analyte Sensing with Catalytic Micromotors." Biosensors 13, no. 1 (2022): 45. http://dx.doi.org/10.3390/bios13010045.

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Catalytic micromotors can be used to detect molecules of interest in several ways. The straightforward approach is to use such motors as sensors of their “fuel” (i.e., of the species consumed for self-propulsion). Another way is in the detection of species which are not fuel but still modulate the catalytic processes facilitating self-propulsion. Both of these require analysis of the motion of the micromotors because the speed (or the diffusion coefficient) of the micromotors is the analytical signal. Alternatively, catalytic micromotors can be used as the means to enhance mass transport, and
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Vijay, Natarajan, Sampathkumar Jeevanandham, Subramaniyan Ramasundaram, Tae Hwan Oh, and Subramanian Tamil Selvan. "Recent Advancements in Multimodal Chemically Powered Micro/Nanorobots for Environmental Sensing and Remediation." Chemosensors 13, no. 2 (2025): 69. https://doi.org/10.3390/chemosensors13020069.

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Chemically powered micro/nanorobots (CPMNRs) are self-propelling artificially engineered materials or machines designed with micro-to-nano precision, inspired by the self-migration of biomolecules and microorganisms. CPMNRs convert chemical or external energy into mechanical motion, overcoming forces like Brownian diffusion and viscosity. They are created using top-down or bottom-up approaches for applications in chemo-/biosensing, environmental remediation, molecular imaging, and drug delivery. As self-mixing of contaminated water accelerates the remediation process, CPMNRs are preferred as a
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Tătulea-Codrean, Maria, and Eric Lauga. "Artificial chemotaxis of phoretic swimmers: instantaneous and long-time behaviour." Journal of Fluid Mechanics 856 (October 12, 2018): 921–57. http://dx.doi.org/10.1017/jfm.2018.718.

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Phoretic swimmers are a class of artificial active particles that has received significant attention in recent years. By making use of self-generated gradients (e.g. in temperature, electric potential or some chemical product) phoretic swimmers are capable of self-propulsion without the complications of mobile body parts or a controlled external field. Focusing on diffusiophoresis, we quantify in this paper the mechanisms through which phoretic particles may achieve chemotaxis, both at the individual and the non-interacting population level. We first derive a fully analytical law for the insta
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Menzel, Andreas M. "Statistics for an object actively driven by spontaneous symmetry breaking into reversible directions." Journal of Chemical Physics 157, no. 1 (2022): 011102. http://dx.doi.org/10.1063/5.0093598.

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Propulsion of otherwise passive objects is achieved by mechanisms of active driving. We concentrate on cases in which the direction of active drive is subject to spontaneous symmetry breaking. In our case, this direction will be maintained until a large enough impulse by an additional stochastic force reverses it. Examples may be provided by self-propelled droplets, gliding bacteria stochastically reversing their propulsion direction, or nonpolar vibrated hoppers. The magnitude of active forcing is regarded as constant, and we include the effect of inertial contributions. Interestingly, this s
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Guo Si-Hang, Yang Guang-Yu, Meng Guo-Qing, Wang Ying-Ying, Pan Jun-Xing, and Zhang JinJun. "Dynamic Self-Assembly of Active Particle Systems Controlled by Light Fields." Acta Physica Sinica 74, no. 9 (2025): 0. https://doi.org/10.7498/aps.74.20241556.

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Active particle systems are nonequilibrium systems composed of selfpropelled Brownian particles, where interactions between particles can give rise to various collective behaviors. This study, based on Brownian dynamics simulations, explores the effects of light intensity, rotational diffusion coefficient, and the width and spacing of illuminated regions on the aggregation structures of the system. First, this study examines the influence of light intensity on aggregation structures under different rotational diffusion coefficients, finding that as the rotational diffusion coefficient increase
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Dissertations / Theses on the topic "Self-diffusion and self-propulsion"

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Equy, Eloïse. "Polymersomes Janus : conception rationnelle, préparation et fonctionnalisation asymétrique pour le développement de systèmes auto-propulsés de délivrance ciblée de médicaments." Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0465.

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Mimer les propriétés des cellules vivantes dans des protocellules artificielles suscite un intérêt considérable, notamment pour reproduire la motilité et le mouvement directionnel dans des applications de thérapies « intelligentes ». En raison de leur morphologie vésiculaire et de leur stabilité, les polymersomes présentent un grand potentiel pour la délivrance de médicaments, et l'introduction d'une asymétrie est essentielle pour permettre leur auto-propulsion. Bien que plusieurs approches, telles que la séparation de phase au sein de la membrane, aient été utilisées pour créer des polymersom
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Schachoff, Romy, Markus Selmke, Andreas Bregulla, et al. "Hot Brownian motion and photophoretic self-propulsion." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-198886.

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We describe the motion of heated particles in a simple liquid, for which we can theoretically derive generalized fluctuation-dissipation relations that hold far from equilibrium, as we demonstrate both experimentally and via molecular-dynamics simulations. Due to persistent laser-light absorption, these particles excite a radially symmetric or asymmetric (Janus particles) temperature profile in the solvent, which affects their random (Brownian) and systematic (self-phoretic) motion. In case of a radially symmetric temperature profile, we show that the particles perform “hot Brownian motion” (H
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Zavala, Martinez Arantza. "Dynamics of hybrid rod-like viruses and spherical gold nanoparticles self-assemblies : from matchstick-like particles to colloidal stars." Electronic Thesis or Diss., Bordeaux, 2022. http://www.theses.fr/2022BORD0177.

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Dans cette thèse, nous étudions la diffusion d'auto-assemblages hybrides à base des virus en forme de filament et des nanoparticules d'or. Dans ce but, nous utilisons des bactériophages qui ont été génétiquement modifiés afin de posséder des groupements cystéines exposés à leur extrémité proximale. La présence des ponts disulfure à l'une de leurs pointes leur permet ainsi de se lier aux nanoparticules métalliques par une liaison covalente de coordination. La morphologie des différents colloïdes hybrides formés dépend de l'excès molaire initial entre virus et nanoparticules. Lorsque les deux él
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Schachoff, Romy, Markus Selmke, Andreas Bregulla, et al. "Hot Brownian motion and photophoretic self-propulsion." Diffusion fundamentals 23 (2015) 1, S. 1-19, 2015. https://ul.qucosa.de/id/qucosa%3A14579.

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We describe the motion of heated particles in a simple liquid, for which we can theoretically derive generalized fluctuation-dissipation relations that hold far from equilibrium, as we demonstrate both experimentally and via molecular-dynamics simulations. Due to persistent laser-light absorption, these particles excite a radially symmetric or asymmetric (Janus particles) temperature profile in the solvent, which affects their random (Brownian) and systematic (self-phoretic) motion. In case of a radially symmetric temperature profile, we show that the particles perform “hot Brownian motion” (H
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Book chapters on the topic "Self-diffusion and self-propulsion"

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A. Guinee, Richard. "Novel Application of Fast Simulated Annealing Method in Brushless Motor Drive (BLMD) Dynamical Parameter Identification for Electric Vehicle Propulsion." In Self-driving Vehicles and Enabling Technologies [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97370.

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Permanent magnet brushless motor drives (BLMD) are extensively used in electric vehicle (EV) propulsion systems because of their high power and torque to weight ratio, virtually maintenance free operation with precision control of torque, speed and position. An accurate dynamical parameter identification strategy is an essential feature in the adaptive control of such BLMD-EV systems where sensorless current feedback is employed for reliable torque control, with multi-modal penalty cost surfaces, in EV high performance tracking and target ranging. Application of the classical Powell Conjugate
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Conference papers on the topic "Self-diffusion and self-propulsion"

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Falkenstein-Smith, Ryan, Pingying Zeng, Tyler Culp, and Jeongmin Ahn. "Thermal Transpiration Based Propulsion." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-39121.

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Thermal transpiration based propulsion is studied. Thermal transpiration describes flowing of the gas through a narrow channel with an imposed temperature gradient. As gas flows from the cold to hot side in the chamber, a pressure gradient is created across the channel induced by the temperature gradient. Between the two sides of the chamber an aerogel substance, which functions as an excellent insulator, is used as a thermal transpiration membrane and allows gas diffuse to the hot chamber. The induced pressure gradient is the driving factor in the propulsion of air, or any gas, into the chamb
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