Dynamic Templating of Colloidal Patterns in Three Dimensions with Nonuniform Electric Fields

Bartlett, Andrew; Agarwal, Amit; Yethiraj, Anand

doi:10.1021/la200179c

Cited by 16 publications

(20 citation statements)

References 39 publications

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“…A significant work has been dedicated to various aspects of equilibrium colloidal structures obtained as a result of static self-assembly [8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23]. Static magnetic and electric fields have been successfully used to direct and control the self-assembly processes through in-situ modification of particle interactions [24,25,26,27,28,29,30,31,32,33,34,35].…”

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confidence: 99%

Complex collective dynamics of active torque-driven colloids at interfaces

Snezhko

2016

Current Opinion in Colloid & Interface Science

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Modern self-assembly techniques aiming to produce complex structural order or functional diversity often rely on non-equilibrium conditions in the system.Light, electric or magnetic fields are predominantly used to modify interaction profiles of colloidal particles during self-assembly or induce complex outof-equilibrium dynamic ordering. The energy injection rate, and properties of the environment are important control parameters that influence the outcome of active (dynamic) self-assembly. The current review is focused on a case of collective dynamics and self-assembly of particles with externally driven torques coupled to a liquid or solid interface. The complexity of interactions in such systems is further enriched by strong hydrodynamic coupling between particles.Unconventionally ordered dynamic self-assembled patterns, spontaneous symmetry breaking phenomena, self-propulsion and collective transport have been reported in torque-driven colloids. Some of the features of the complex collective behavior and dynamic pattern formation in those active systems have been successfully captured in simulations.

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confidence: 99%

Complex collective dynamics of active torque-driven colloids at interfaces

Snezhko

2016

Current Opinion in Colloid & Interface Science

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“…DEP is defined as the translational motion of particles caused by an inhomogeneous electric field (14) and has been previously used for particle manipulation (16)(17)(18)(19)(20), particle/cell separation (21-26), and particle assembly/trapping. (17,19,(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38) Electrically driven particle motion depends on the dielectric constant contrast between the solvent and the particle.…”

Section: Resultsmentioning

confidence: 99%

Periodically microstructured composite films made by electric- and magnetic-directed colloidal assembly

Demirörs

Courty

Libanori

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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Living organisms often combine soft and hard anisotropic building blocks to fabricate composite materials with complex microstructures and outstanding mechanical properties. An optimum design and assembly of the anisotropic components reinforces the material in specific directions and sites to best accommodate multidirectional external loads. Here, we fabricate composite films with periodic modulation of the soft-hard microstructure by simultaneously using electric and magnetic fields. We exploit forefront directed-assembly approaches to realize highly demanded material microstructural designs and showcase a unique example of how one can bridge colloidal sciences and composite technology to fabricate next-generation advanced structural materials. In the proof-of-concept experiments, electric fields are used to dictate the position of the anisotropic particles through dielectrophoresis, whereas a rotating magnetic field is used to control the orientation of the particles. By using such unprecedented control over the colloidal assembly process, we managed to fabricate ordered composite microstructures with up to 2.3-fold enhancement in wear resistance and unusual site-specific hardness that can be locally modulated by a factor of up to 2.5.L ightweight composites offer an attractive alternative toward minimization of the energy demand of mobility systems from automobiles and airplanes to trains and ships. Continuous stiff fibers or discontinuous anisotropic particles have often been used as reinforcing phase to enhance the specific mechanical properties of such lightweight polymer-based composites. Although the fabrication costs of long-fiber reinforced composites remain prohibitive for the large-scale production of high-performance materials, the processing of polymer-based composites reinforced with discontinuous stiff elements can often be adapted to the automated manufacturing processes commonly used in the polymer industry, such as injection molding. However, these fabrication processes usually offer a limited control over the alignment and spatial distribution of the reinforcing particles, preventing a full optimization of the microstructural design in composite materials. Thus, the development of new strategies to assemble microstructured composites with tailored reinforcing architectures is crucial for the design and fabrication of even lighter and cheaper structural materials.Control over the spatial distribution and orientation of particles in composites can be achieved using colloidal assembly tools that guide/template the organization of the reinforcing particles while the material is still in a fluid state. Recently, we have shown that control of particle orientation using an external magnetic field can lead to a significant increase in the materials' resistance against deformation, wear, and crack initiation, widening their range of applications (1, 2). Independent of orientation control, tuning the spatial distribution of particles through magnetic fields, centrifugal forces, or film welding techniq...

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“…The self-assembly can be direct or indirect, free, or assisted, depending upon the process involved [8]. It includes template-assisted direct self-assembly [9], template-free direct self-assembly [10,11] externally directed self-assembly [4,12] (electric [13], magnetic [14], and flow fields [15]), self-assembly at liquid interfaces [16], self-assembly by wetting-dewetting [17], scanning probe lithography [18], and nano-imprinting [19].…”

Section: "Coffee Stain" Phenomenon and Its Removalmentioning

confidence: 99%

Assembling Magnetic Nanoparticles on Nanomechanical Resonators for Torque Magnetometry

Firdous

Potter

2020

IJMS

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We report a highly compliant process for patterning nanoparticle arrays on micro- and nanomechanical devices. The distinctive step involves the single layer self-assembled nanoparticles on top of released nanomechanical devices. We demonstrate the process by fabricating sizable arrays of nanomechanical devices on silicon-on-insulator substrates, acting as nanomechanical torque magnetometers. Later, the nanoparticles were self-assembled in geometrical shapes on top of the devices by a unique combination of top-down and bottom-up methods. The self-assembled array of nanoparticles successfully showed a magnetic torque signal by magnetic actuation of the magnetometer. This patterning process can be generalized for any shape and for a wide range of nanoparticles on the nanomechanical resonators.

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Dynamic Templating of Colloidal Patterns in Three Dimensions with Nonuniform Electric Fields

Cited by 16 publications

References 39 publications

Complex collective dynamics of active torque-driven colloids at interfaces

Complex collective dynamics of active torque-driven colloids at interfaces

Periodically microstructured composite films made by electric- and magnetic-directed colloidal assembly

Assembling Magnetic Nanoparticles on Nanomechanical Resonators for Torque Magnetometry

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