Recent advances in manipulation of micro- and nano-objects with magnetic fields at small scales

Cao, Quanliang; Fan, Qi; Chen, Qi; Liu, Chunting; Han, Xiaotao; Li, Liang

doi:10.1039/c9mh00714h

Cited by 121 publications

(72 citation statements)

References 297 publications

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“…Comparing with other methods, magnetic interaction exhibits its unique advantages in the use of self‐assembly. For instance, magnetic force has strong penetration which helps it manipulate the objects behind the barriers, such as glass and biological matter, without direct contact [37] …”

Section: Self‐assembly Through Various Mechanismsmentioning

confidence: 99%

“…For instance, magnetic force has strong penetration which helps it manipulate the objects behind the barriers, such as glass and biological matter, without direct contact. [37] The number of particles that can be magnetically manipulated to form complex MNRs structures includes ferromagnetic particles, Janus particles with iron oxide, patches of magnetically capped particles and metal deposits, etc. For example, Mojca Vilfan et al used superparamagnetic particles (4:4 mm) to form artificial biomimetic cilia (long chain, L ¼ 31 mm), as displayed in Figure 3a, which could mix and pump of fluids by mimicking the motion of cilia.…”

Section: Magnetic Forcementioning

confidence: 99%

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Self‐assembled Micro‐nanorobots: From Assembly Mechanisms to Applications

et al. 2021

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Due to the extremely tiny size, micro‐nanorobots hold promise in performing tasks at the micro‐nanoscale, which is impossible for macroscale robots. However, the massive fabrication of micro‐nanorobots is of crucial challenge and has been attracting extensive attention among academics. Active colloids can be self‐assembled into ordered structures, and offer a promising solution to this largescale manufacture challenge. Here, we summarize the development and mechanisms of different assembly technologies in the past two decades, and introduce the applications of micro‐nanorobots using self‐assembly strategies in biomedical and physical fields. For clarification, the self‐assembly mechanisms are presented in three categories: chemical, physical and biological. The manufacture of micro‐nanorobots through self‐assembly not only solves the problem of large‐scale manufacturing, but also increases the reconfigurability of structure and improves their adaptability to the environment, which promises further development as microsurgeons and the application of micro‐nanorobots in other fields, such as environmental restoration and micro‐manipulation.

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Section: Self‐assembly Through Various Mechanismsmentioning

confidence: 99%

Section: Magnetic Forcementioning

confidence: 99%

Self‐assembled Micro‐nanorobots: From Assembly Mechanisms to Applications

et al. 2021

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“…1 Later, it was found that nanostructures can be manipulated with the use of an electromagnetic wave. In 2018, the Nobel Prize in physics was awarded for the creation of nanooptical tweezers, 2 and further solutions have followed, including methods of manipulating nano-and micro-objects with the use of a magnetic eld 3 and manipulating objects smaller than 100 nm optically. 4 Technologies for manipulating atomic objects and nanoclusters allow for the creation of many interesting individual nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Photo-assembly of plasmonic nanoparticles: methods and applications

2021

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“…[ 17,18 ] In fact, the aggregation of multiple beads occurs because the energy well created by the external field is larger than the nano‐microbeads used for labels and thus multiple beads gather at a single energy well. [ 18,19 ] Here, since the size of the potential energy well created by bulk magnets or magnetic coils is too large to confine a single bead, the interparticle distance of trapped beads cannot be controlled individually. [ 20,21 ]…”

Section: Introductionmentioning

confidence: 99%

Magnetophoretic Decoupler for Disaggregation and Interparticle Distance Control

et al. 2021

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The manipulation of superparamagnetic beads has attracted various lab on a chip and magnetic tweezer platforms for separating, sorting, and labeling cells and bioentities, but the irreversible aggregation of beads owing to magnetic interactions has limited its actual functionality. Here, an efficient solution is developed for the disaggregation of magnetic beads and interparticle distance control with a magnetophoretic decoupler using an external rotating magnetic field. A unique magnetic potential energy distribution in the form of an asymmetric magnetic thin film around the gap is created and tuned in a controlled manner, regulated by the size ratio of the bead with a magnetic pattern. Hence, the aggregated beads are detached into single beads and transported in one direction in an array pattern. Furthermore, the simultaneous and accurate spacing control of multiple magnetic bead pairs is performed by adjusting the angle of the rotating magnetic field, which continuously changes the energy well associated with a specific shape of the magnetic patterns. This technique offers an advanced solution for the disaggregation and controlled manipulation of beads, can allow new possibilities for the enhanced functioning of lab on a chip and magnetic tweezers platforms for biological assays, intercellular interactions, and magnetic biochip systems.

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Recent advances in manipulation of micro- and nano-objects with magnetic fields at small scales

Abstract: Magnetic manipulation is very promising for the motion control of micro- and nano-objects, which has wide applications in the mixing, trapping, colloidal assembly and object transport, and the recent progress in these areas is reviewed in this work.

Cited by 121 publications

References 297 publications

Self‐assembled Micro‐nanorobots: From Assembly Mechanisms to Applications

Self‐assembled Micro‐nanorobots: From Assembly Mechanisms to Applications

Photo-assembly of plasmonic nanoparticles: methods and applications

Magnetophoretic Decoupler for Disaggregation and Interparticle Distance Control

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