Controlled Propulsion of Artificial Magnetic Nanostructured Propellers

Ghosh, Ambarish; Fischer, Peer

doi:10.1021/nl900186w

Cited by 1,174 publications

(1,024 citation statements)

References 26 publications

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“…The optimal value of the helix angle is in the range Θ = 35 • ÷ 45 • maximizing the chirality, Ch ≈ 0.2 (v). Despite a large variability in the nanofabrication techniques and experimental setups [4][5][6][7][8][9][10]19], it is interesting to point out that one of the pioneering experimental works in this field, [4], has empirically adopted most of the rules formulated above.…”

Section: Discussionmentioning

confidence: 99%

“…The situation has changed dramatically with the development of the fundamentally new approach to the directed transport of magnetic particles. It was demonstrated [4][5][6] that the rotating magnetic field even of small or moderate amplitude can be applied for propulsion of chiral magnetic nanoparticles. These particles are named "artificial bacterial flagella" due to their biomimetic helical shape that provides chirality necessary for propulsion [5].…”

Section: Introductionmentioning

confidence: 99%

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The chiral magnetic nanomotors

2014

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Propulsion of the chiral magnetic nanomotors powered by a rotating magnetic field is in the focus of the modern biomedical applications. This technology relies on strong interaction of dynamic and magnetic degrees of freedom of the system. Here we study in detail various experimentally observed regimes of the helical nanomotor orientation and propulsion depending on the actuation frequency, and establish the relation of these two properties with the remanent magnetization and geometry of the helical nanomotors. The theoretical predictions for the transition between the regimes and nanomotor orientation and propulsion speed are in excellent agreement with available experimental data. The proposed theory offers a few simple guidelines towards the optimal design of the magnetic nanomotors. In particular, efficient nanomotors should be fabricated of hard magnetics, e.g., cobalt, magnetized transversally and have the geometry of a normal helix with a helical angle of 35 • ÷ 45 • .

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The chiral magnetic nanomotors

2014

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“…1 In liquids, microswimmers like bacteria, sperm cells, algae and certain protozoa have inspired many attempts to create articial and biomimetic swimmers. [2][3][4][5][6][7] Conceptually this task benets from a rather good theoretical understanding, as these swimmers oen can be effectively described by point force dipoles (stokeslets). 8,9 The situation is very different for objects that are self-propelled along so and deformable substrateslike crawling cells (keratocytes, broblasts, leukocytes etc.).…”

Section: Introductionmentioning

confidence: 99%

Modeling crawling cell movement on soft engineered substrates

2014

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Self-propelled motion, emerging spontaneously or in response to external cues, is a hallmark of living organisms. Systems of self-propelled synthetic particles are also relevant for multiple applications, from targeted drug delivery to the design of self-healing materials. Self-propulsion relies on the force transfer to the surrounding. While self-propelled swimming in the bulk of liquids is fairly well characterized, many open questions remain in our understanding of self-propelled motion along substrates, such as in the case of crawling cells or related biomimetic objects. How is the force transfer organized and how does it interplay with the deformability of the moving object and the substrate? How do the spatially dependent traction distribution and adhesion dynamics give rise to complex cell behavior? How can we engineer a specific cell response on synthetic compliant substrates? Here we generalize our recently developed model for a crawling cell by incorporating locally resolved traction forces and substrate deformations.The model captures the generic structure of the traction force distribution and faithfully reproduces experimental observations, like the response of a cell on a gradient in substrate elasticity (durotaxis). It also exhibits complex modes of cell movement such as "bipedal" motion. Our work may guide experiments on cell traction force microscopy and substrate-based cell sorting and can be helpful for the design of biomimetic "crawlers" and active and reconfigurable self-healing materials.

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“…More specifically, the bubble type (putt-putt boat type) swimmers are using momentum transfer through the microstreaming formed by bubble oscillation [19,20]. The micro robots that harness natural organisms or use the artificial cilia/flagella (regardless of motion types, corkscrew motion, or flexible oar motion) generate propulsion via viscous stress interaction [17,18,[21][22][23][24][25][26]. Among the chemical micro swimmers, even though there are still debates on the mechanism [27], some devices utilize the bubble recoiling method to make momentum transfer by inertia propulsion [28][29][30][31].…”

Section: Propulsion In Micron and Nano Scalementioning

confidence: 99%

Mini and Micro Propulsion for Medical Swimmers

Feng

Cho

2014

Micromachines

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Mini and micro robots, which can swim in an underwater environment, have drawn widespread research interests because of their potential applicability to the medical or biological fields, including delivery and transportation of bio-materials and drugs, bio-sensing, and bio-surgery. This paper reviews the recent ideas and developments of these types of self-propelling devices, ranging from the millimeter scale down to the micro and even the nano scale. Specifically, this review article makes an emphasis on various propulsion principles, including methods of utilizing smart actuators, external magnetic/electric/acoustic fields, bacteria, chemical reactions, etc. In addition, we compare the propelling speed range, directional control schemes, and advantages of the above principles.

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Controlled Propulsion of Artificial Magnetic Nanostructured Propellers

Cited by 1,174 publications

References 26 publications

The chiral magnetic nanomotors

The chiral magnetic nanomotors

Modeling crawling cell movement on soft engineered substrates

Mini and Micro Propulsion for Medical Swimmers

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