Yield Behavior of Moderately Filled Epoxy/Ni Suspensions

Zhou, Jianyu; Sancaktar, Erol

doi:10.1163/016942410x507669

Cited by 4 publications

(2 citation statements)

References 51 publications

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“…Addressing the first four points will lead to a better physical understanding of edge fracture. The last point is important for practical applications, such as the dispensing of functional fluids that are viscoelastic with yield stress nature (50)(51)(52).…”

Section: Discussionmentioning

confidence: 99%

Torsional fracture of viscoelastic liquid bridges

Chan

Berlo

Faizi

et al. 2021

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

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Short liquid bridges are stable under the action of surface tension. In applications like electronic packaging, food engineering, and additive manufacturing, this poses challenges to the clean and fast dispensing of viscoelastic fluids. Here, we investigate how viscoelastic liquid bridges can be destabilized by torsion. By combining high-speed imaging and numerical simulation, we show that concave surfaces of liquid bridges can localize shear, in turn localizing normal stresses and making the surface more concave. Such positive feedback creates an indent, which propagates toward the center and leads to breakup of the liquid bridge. The indent formation mechanism closely resembles edge fracture, an often undesired viscoelastic flow instability characterized by the sudden indentation of the fluid’s free surface when the fluid is subjected to shear. By applying torsion, even short, capillary stable liquid bridges can be broken in the order of 1 s. This may lead to the development of dispensing protocols that reduce substrate contamination by the satellite droplets and long capillary tails formed by capillary retraction, which is the current mainstream industrial method for destabilizing viscoelastic liquid bridges.

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Section: Discussionmentioning

confidence: 99%

Torsional fracture of viscoelastic liquid bridges

Chan

Berlo

Faizi

et al. 2021

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

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“…For obtaining the relationship between gas-liquid interfacial tension and its fractal dimension, Wang et al [ 62 ] put forward a method to calculate the fractal dimension of gas-liquid interface. In the suspension, the fractal dimension of different systems is different; under shear, the suspension structure may be more inclined to reaction limited cluster-cluster aggregation(RLCA), and a more flocculated structure or particle rearrangement may exist in the suspension, which can result in a dense filler structure in the shear suspension structure [ 63 ]. As for the nanoparticles doped in polymer materials, the diffusion of nanoparticles in fractal interior and surface determines the shape of islands left on the surface after fractal fragmentation [ 64 ].…”

Section: Properties and Fractal Of Polymers And Their Composites Imentioning

confidence: 99%

Review about the Application of Fractal Theory in the Research of Packaging Materials

Duan

Mao

et al. 2021

Materials

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The work is intended to summarize the recent progress in the work of fractal theory in packaging material to provide important insights into applied research on fractal in packaging materials. The fractal analysis methods employed for inorganic materials such as metal alloys and ceramics, polymers, and their composites are reviewed from the aspects of fractal feature extraction and fractal dimension calculation methods. Through the fractal dimension of packaging materials and the fractal in their preparation process, the relationship between the fractal characteristic parameters and the properties of packaging materials is discussed. The fractal analysis method can qualitatively and quantitatively characterize the fractal characteristics, microstructure, and properties of a large number of various types of packaging materials. The method of using fractal theory to probe the preparation and properties of packaging materials is universal; the relationship between the properties of packaging materials and fractal dimension will be a critical trend of fractal theory in the research on properties of packaging materials.

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