Complex fluids in animal survival strategies

Rühs, Patrick A.; Bergfreund, Jotam; Bertsch, Pascal; Gstöhl, Stefan; Fischer, Peter

doi:10.1039/d1sm00142f

Cited by 15 publications

(4 citation statements)

References 105 publications

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“…When these materials are added into an existing fluid, they might be called rheological modifiers, and handbooks for these exist (Ash & Ash 2006, Braun & Rosen 2000 to support chemical formulation (Bröckel et al 2013) and chemical product design (Cussler & Moggridge 2011). Several textbooks explain, for a given material structure, what rheological properties might result (e.g., Gauzzelli & Morris 2012, Graham 2018, Larson 1999, Rubinstein & Colby 2003. These are typically organized from the analysis perspective, that is, the forward problem of cause and effect.…”

Section: Materials Microstructuresmentioning

confidence: 99%

Designing Complex Fluids

Ewoldt

2022

Annu. Rev. Fluid Mech.

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Taking a small step away from Newtonian fluid behavior creates an explosion in the range of possibilities. Non-Newtonian fluid properties can achieve diverse flow objectives, but the complexity introduces challenges. We survey useful rheological complexity along with organizing principles and design methods as we consider the following questions: How can non-Newtonian properties be useful? What properties are needed? How can we get those properties? Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 54 is January 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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Section: Materials Microstructuresmentioning

confidence: 99%

Designing Complex Fluids

Ewoldt

2022

Annu. Rev. Fluid Mech.

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“…Formulating complex fluids for additive manufacturing processes, however, requires a thorough understanding of structure-to-rheology and rheology-to-flow relations [ 3 ]. The flow properties of complex fluids become particularly important in the fabrication of functional structures in multiple length scales [ 4 ]. One of the strategies for fabricating hierarchical structures is exploiting the spontaneous self-assembly of materials, which requires components to be mobile in the fluid phase for self-constructing ordered structures [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Engineering Nano/Microscale Chiral Self-Assembly in 3D Printed Constructs

Esmaeili,

Akbari,

George

et al. 2023

Nano-Micro Lett.

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Helical hierarchy found in biomolecules like cellulose, chitin, and collagen underpins the remarkable mechanical strength and vibrant colors observed in living organisms. This study advances the integration of helical/chiral assembly and 3D printing technology, providing precise spatial control over chiral nano/microstructures of rod-shaped colloidal nanoparticles in intricate geometries. We designed reactive chiral inks based on cellulose nanocrystal (CNC) suspensions and acrylamide monomers, enabling the chiral assembly at nano/microscale, beyond the resolution seen in printed materials. We employed a range of complementary techniques including Orthogonal Superposition rheometry and in situ rheo-optic measurements under steady shear rate conditions. These techniques help us to understand the nature of the nonlinear flow behavior of the chiral inks, and directly probe the flow-induced microstructural dynamics and phase transitions at constant shear rates, as well as their post-flow relaxation. Furthermore, we analyzed the photo-curing process to identify key parameters affecting gelation kinetics and structural integrity of the printed object within the supporting bath. These insights into the interplay between the chiral inks self-assembly dynamics, 3D printing flow kinematics and photo-polymerization kinetics provide a roadmap to direct the out-of-equilibrium arrangement of CNC particles in the 3D printed filaments, ranging from uniform nematic to 3D concentric chiral structures with controlled pitch length, as well as random orientation of chiral domains. Our biomimetic approach can pave the way for the creation of materials with superior mechanical properties or programable photonic responses that arise from 3D nano/microstructure and can be translated into larger scale 3D printed designs.

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“…Their amphiphilic nature drives them to adsorb to fluid interfaces, where they undergo a structural deformation due to lateral interfacial stresses and thermodynamically favorable rearrangements. Understanding protein adsorption to fluid interfaces, and the consequent assembly and refolding, is essential for the development of industrial emulsions and foams, the stability of pharmaceutical biotherapeutic formulations, the understanding of animal and human physiological mechanisms, and for many environmental processes [1][2][3][4][5][6][7]. However, elucidating the adsorption and reconfiguration processes is a complex task with several unresolved issues.…”

Section: Introductionmentioning

confidence: 99%