Fabrication of syntactic foam fillers <i>via</i> integrated on/off-chip microfluidic methods for optimized geopolymer composites

Wu, Hao; Ren, Yukun; Jiang, Tianyi; Wu, Wei; Lü, Yang; Jiang, Hongyuan

doi:10.1039/d1lc00901j

Cited by 6 publications

(5 citation statements)

References 48 publications

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“…The innate small-volume endows the colloidal emulsion droplets with a series of advantages including a high surface aspect ratio, trace amount of reagent consumption, ultra-fast heat, and mass transfer as well as pronounced interfacial effects, which has laid a solid foundation for their practical usage. 27–29 However, for higher-end scenarios with stringent requirements, the degree of overall monodispersity as well as on-demand accurate morphology and dimension regulation are of vital importance during the generation process of colloidal emulsion droplets. Generally, droplets are derived from fluid instability under the multiphasic circumstance, where the viscous shear force usually plays a dominant role in discretizing the continuous fluid stream.…”

Section: Introductionmentioning

confidence: 99%

Effective colloidal emulsion droplet regulation in flow-focusing glass capillary microfluidic device via collection tube variation

Jiang,

Wu,

Liu

et al. 2024

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Effective colloidal emulsion droplet regulation in flow-focusing glass capillary microfluidic device via collection tube variation

Jiang,

Wu,

Liu

et al. 2024

RSC Adv.

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“…In recent years, microfluidics-enabled soft manufacturing has emerged as a robust technological means to fabricate liquid templates with well-controlled composition and morphology, which has already innovated the fabrication approach in various fields, encompassing chemistry, biology, physics, and engineering [ 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 ]. The easily prepared double-emulsion droplets with a core–shell structure possess a series of advantages, including controllable compositions, adjustable dimensions, and a higher degree of structural homogeneity, which have already been exploited to fabricate hollow microspheres via the sintering of ceramic nanoparticles inside the shell solution [ 53 , 54 , 55 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Eccentricity Difference on the Mechanical Response of Microfluidics-Derived Hollow Silica Microspheres during Nanoindentation

Wu,

Chen,

Jiang

et al. 2024

Micromachines

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Hollow microspheres as the filler material of syntactic foams have been adopted in extensive practical applications, where the physical parameters and their homogeneity have been proven to be critical factors during the design process, especially for high-specification scenarios. Based on double-emulsion droplet templates, hollow microspheres derived from microfluidics-enabled soft manufacturing have been validated to possess well-controlled morphology and composition with a much narrower size distribution and fewer defects compared to traditional production methods. However, for more stringent requirements, the innate density difference between the core–shell solution of the double-emulsion droplet template shall result in the wall thickness heterogeneity of the hollow microsphere, which will lead to unfavorable mechanical performance deviations. To clarify the specific mechanical response of microfluidics-derived hollow silica microspheres with varying eccentricities, a hybrid method combining experimental nanoindentation and a finite element method (FEM) simulation was proposed. The difference in eccentricity can determine the specific mechanical response of hollow microspheres during nanoindentation, including crack initiation and the evolution process, detailed fracture modes, load-bearing capacity, and energy dissipation capability, which should shed light on the necessity of optimizing the concentricity of double-emulsion droplets to improve the wall thickness homogeneity of hollow microspheres for better mechanical performance.

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“…As a typical sort of architectural material, the performance of a mechanical metamaterial can be effectively regulated through the rational design of the architecture and dimension as well as composition selection. Thus, a variety of prominent functionalities have been achieved including ultrahigh strength-to-density ratio, − great energy absorption capability, − damage tolerance, − recoverability, − etc., which can be barely realized by traditional materials, even if they were reinforced with a strengthening phase to form composites. − In general, mechanical metamaterials are organized by the periodical stacking of unit cells with a dimension range spanning multiple orders of magnitude. This formation manner directly results in the homogeneous internal structure if both the dimension and composition remain constant simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Three Dimensional Printing of Bioinspired Crossed-Lamellar Metamaterials with Superior Toughness for Syntactic Foam Substitution

Chen

Duan

et al. 2022

ACS Appl. Mater. Interfaces

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Biological materials such as conch shells with crossed-lamellar textures hold impressive mechanical properties due to their capability to realize effective crack control and energy dissipation through the structural synergy of interfacial modulus mismatch and lamellar orientation disparity. Integrating this mechanism with mechanical metamaterial design can not only avoid the catastrophic post-yield stress drop found in traditional architectural materials with uniform lattice structures but also effectively maintain the stress level and improve the energy absorption ability. Herein, a novel bioinspired design strategy that combines regional particularity and overall cyclicity is proposed to innovate the connotation of long-range periodicity inside the metamaterial, in which the node constraint gradient and crossed-lamellar struts corresponding to the core features of conch shells are able to guide the deformation sequence with a self-strengthening response during compression. Detailed in situ experiments and finite element analysis confirm that the rotated broad layer stacking can shorten and impede the shear bands, further transforming the deformation of bioinspired metamaterial into a progressive, hierarchical way, highlighted by the cross-layer hysteresis. Even based on a brittle polymeric resin, excellent specific energy absorption capacity [4544 kJ/kg] has been achieved in this architecture, which far exceeds the reported metal-based syntactic foams for two orders of magnitude. These results offer new opportunities for the bioinspired metamaterials to substitute the widespread syntactic foams in specific applications required for both lightweight and energy absorption.

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Fabrication of syntactic foam fillers via integrated on/off-chip microfluidic methods for optimized geopolymer composites

Abstract: To meet the evolving requirements of material designability, sustainability, and eco-friendliness, the development of syntactic foams puts great emphasis on filler optimization and matrix selection. Here, we present a novel...

Cited by 6 publications

References 48 publications

Effective colloidal emulsion droplet regulation in flow-focusing glass capillary microfluidic device via collection tube variation

Effective colloidal emulsion droplet regulation in flow-focusing glass capillary microfluidic device via collection tube variation

Effect of Eccentricity Difference on the Mechanical Response of Microfluidics-Derived Hollow Silica Microspheres during Nanoindentation

Three Dimensional Printing of Bioinspired Crossed-Lamellar Metamaterials with Superior Toughness for Syntactic Foam Substitution

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