Arranging Ellipsoidal Particles in Three-Dimensional User-Specified Orientations with Ultrasound-Directed Self-Assembly

Prisbrey, M.; Vasquez, Fernando Guevara; Raeymaekers, Bart

doi:10.1103/physrevapplied.14.024026

Cited by 8 publications

(2 citation statements)

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“…The literature documents results for ultrasound DSA of spherical particles in 2D [1,44,45] and 3D, [43,46] and high-aspect-ratio particles in 2D [2] and 3D. [4,47,48] During ultrasound DSA, the concentration of particles in the fluid medium changes as a function of time and location [49] and, specifically, the local particle packing density increases with time at the locations where particles assemble, as particles agglomerate there. Our group has previously quantified the effect of particle volume fraction, particle size, and fluid medium viscosity on the locations where particles assemble [50] and the steady-state local particle packing density.…”

Section: Introductionmentioning

confidence: 99%

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Measuring and Simulating the Transient Packing Density During Ultrasound Directed Self‐Assembly and Vat Polymerization Manufacturing of Engineered Materials

Noparast,

Guevara Vasquez,

Francoeur

et al. 2024

Adv Materials Technologies

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Ultrasound‐directed self‐assembly (DSA) uses ultrasound waves to organize and orient particles dispersed in a fluid medium into specific patterns. Combining ultrasound DSA with vat photopolymerization (VP) enables manufacturing materials layer‐by‐layer, wherein each layer the organization and orientation of particles in the photopolymer is controlled, which enables tailoring the properties of the resulting composite materials. However, the particle packing density changes with time and location as particles organize into specific patterns. Hence, relating the ultrasound DSA process parameters to the transient local particle packing density is important to tailor the properties of the composite material, and to determine the maximum speed of the layer‐by‐layer VP process. This paper theoretically derives and experimentally validates a 3D ultrasound DSA model and evaluates the local particle packing density at locations where particles assemble as a function of time and ultrasound DSA process parameters. The particle packing density increases with increasing particle volume fraction, decreasing particle size, and decreasing fluid medium viscosity is determined. Increasing the particle size and decreasing the fluid medium viscosity decreases the time to reach steady‐state. This work contributes to using ultrasound DSA and VP as a materials manufacturing process.

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Section: Introductionmentioning

confidence: 99%

“…The literature documents results for ultrasound DSA of spherical particles in 2D [ 1,44,45 ] and 3D, [ 43,46 ] and high‐aspect‐ratio particles in 2D [ 2 ] and 3D. [ 4,47,48 ]…”

Section: Introductionmentioning

confidence: 99%

Measuring and Simulating the Transient Packing Density During Ultrasound Directed Self‐Assembly and Vat Polymerization Manufacturing of Engineered Materials

Noparast,

Guevara Vasquez,

Francoeur

et al. 2024

Adv Materials Technologies

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Multi‐Frequency Ultrasound Directed Self‐Assembly

Presley,

Guevara Vasquez,

Raeymaekers

2024

Adv Funct Materials

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Ultrasound‐directed self‐assembly (DSA) utilizes the acoustic radiation force associated with a standing ultrasound wave field to organize particles dispersed in a fluid medium into specific patterns. State‐of‐the‐art ultrasound DSA methods use single‐frequency ultrasound wave fields, which only allow organizing particles into simple, periodic patterns, or require a large number of ultrasound transducers to assemble complex patterns. In contrast, this work introduces multi‐frequency ultrasound wave fields to organize particles into complex patterns. A method is theoretically derived to determine the operating parameters (frequency, amplitude, phase) of any arrangement of ultrasound transducers, required to assemble spherical particles dispersed in a fluid medium into specific patterns, and experimentally validated for a system with two frequencies. The results show that multi‐frequency compared to single‐frequency ultrasound DSA enables the assembly of complex patterns of particles with substantially fewer ultrasound transducers. Additionally, the method does not incur a penalty in terms of accuracy, and it does not require custom hardware for each different pattern, thus offering reconfigurability, which contrasts, e.g., acoustic holography. Multi‐frequency ultrasound DSA can spur progress in a myriad of engineering applications, including the manufacturing of multi‐functional polymer matrix composite materials that derive their structural, electric, acoustic, or thermal properties from the spatial organization of particles in the matrix.

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3D Printing‐Enabled Nanoparticle Alignment: A Review of Mechanisms and Applications

Jambhulkar

Ravichandran

et al. 2021

Small

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3D printing (additive manufacturing (AM)) has enormous potential for rapid tooling and mass production due to its design flexibility and significant reduction of the timeline from design to manufacturing. The current state-of-the-art in 3D printing focuses on material manufacturability and engineering applications. However, there still exists the bottleneck of low printing resolution and processing rates, especially when nanomaterials need tailorable orders at different scales. An interesting phenomenon is the preferential alignment of nanoparticles that enhance material properties. Therefore, this review emphasizes the landscape of nanoparticle alignment in the context of 3D printing. Herein, a brief overview of 3D printing is provided, followed by a comprehensive summary of the 3D printing-enabled nanoparticle alignment in wellestablished and in-house customized 3D printing mechanisms that can lead to selective deposition and preferential orientation of nanoparticles. Subsequently, it is listed that typical applications that utilized the properties of ordered nanoparticles (e.g., structural composites, heat conductors, chemo-resistive sensors, engineered surfaces, tissue scaffolds, and actuators based on structural and functional property improvement). This review's emphasis is on the particle alignment methodology and the performance of composites incorporating aligned nanoparticles. In the end, significant limitations of current 3D printing techniques are identified together with future perspectives.

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Arranging Ellipsoidal Particles in Three-Dimensional User-Specified Orientations with Ultrasound-Directed Self-Assembly

Cited by 8 publications

References 50 publications

Measuring and Simulating the Transient Packing Density During Ultrasound Directed Self‐Assembly and Vat Polymerization Manufacturing of Engineered Materials

Measuring and Simulating the Transient Packing Density During Ultrasound Directed Self‐Assembly and Vat Polymerization Manufacturing of Engineered Materials

Multi‐Frequency Ultrasound Directed Self‐Assembly

3D Printing‐Enabled Nanoparticle Alignment: A Review of Mechanisms and Applications

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