Active Materials

doi:10.1515/9783110562064

Cited by 7 publications

(3 citation statements)

References 188 publications

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“…In general, however, not much got systematized on the theory side of condensed matter and nonequilibrium statistical mechanics. The same holds true for active meta-and morphing materials where thermal properties and functionalities may depend on nonequilibrium driving [9,10]. It is again important there to quantify the relation between heat and temperature, including now at very low temperatures.…”

Section: Introductionmentioning

confidence: 95%

“…with C(T ) as in (9) and where B(T )δT = qs (T + δT ) − qs (T ) where we indicated the dependence on temperature in the stationary heat flux. The method explained in [23,45] but, in essence, going back to the work of Sullivan & Seidel in [24] and to [25] for equilibrium processes, is applied in each of the nonequilibrium model systems we consider below.…”

Section: Out-of-equilibrium Calorimetrymentioning

confidence: 99%

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Calorimetry for active systems

2023

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We provide the theoretical basis of calorimetry for a class of active particles subject to thermal noise. Simulating AC-calorimetry, we numerically evaluate the heat capacity of run-and-tumble particles in double-well and in periodic potentials, and of systems with a flashing potential. Low-temperature Schottky-like peaks show the role of activity and indicate shape transitions, while regimes of negative heat capacity appear at higher propulsion speeds. From there, a significant increase in heat capacities of active systems may be inferred at low temperatures, as well as the possibility of diagnostic tools for the activity of self-motile artificial or biomimetic systems based on heat capacity measurements.

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Section: Introductionmentioning

confidence: 95%

Section: Out-of-equilibrium Calorimetrymentioning

confidence: 99%

Calorimetry for active systems

2023

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“…), or chemical compositions, as observed in responsive polymers, inspired by biological systems. In this Featured Article, we define ''active materials'' as the materials that can respond to certain conditions and actively change their state to fulfill a specific function due to the design of the materials' structure and composition, which slightly refined the definition of ''active materials'' from Fratzl et al 12 Traditionally, active materials have been fabricated using various methods including mold casting, 13 electrospinning, 14 and photolithography. 15 However, these methods offer limited design space in terms of structural intricacy.…”

Section: Introductionmentioning

confidence: 99%

Extrusion-based 3D printing of soft active materials

Zhao,

Li,

et al. 2024

Chem. Commun.

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Grading Threads. Exploiting Viscous Thread Instability for the additive fabrication of Functionally Graded Structures via sensor-adaptive robotic control

Palma

2023

Archit. Struct. Constr.

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We present a novel computational fabrication method for the production of Functionally Graded Structures (FGS) via robotic control of Viscous Thread Instability (VTI). Of interest in several fields and at different scales of application, the fabrication of FGS is often relying on offline fabrication workflows and on stable material conditions. By introducing partial control in the process of spatial deposition of an extruded clay thread in a state of instability, our method extends the design and fabrication possibilities of VTI to the production of FGS. Traditionally exploited for the industrial production of not-graded two-dimensional nonwoven textiles or for surface treatments in design-related 3d printing applications, we frame VTI as the main design and fabrication driver for the computational fabrication of functionally graded clay volumetric structures. Without relying on predictive physical simulation models, our method relies on feedback information provided by sensing equipment in combination with an industrial 6 axis robotic manipulator integrated with a numerically controlled clay extruder. The sensed information is used to retroactively update the inputs of a computational model programmed to guide the robotic additive fabrication of user-defined functional volumetric gradients. We illustrate the main design- and fabrication-related parameters and a set of material experiments designed to validate the accuracy of our model. We present a set of fabricated outputs to illustrate the flexibility of the model to accommodate a variety of design intentions and, finally, we discuss its potential for further research involving cross-scalar and trans-disciplinary applications.

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Active Materials

Cited by 7 publications

References 188 publications

Calorimetry for active systems

Calorimetry for active systems

Extrusion-based 3D printing of soft active materials

Grading Threads. Exploiting Viscous Thread Instability for the additive fabrication of Functionally Graded Structures via sensor-adaptive robotic control

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