Journal: MRS Communications

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Publisher

Springer

Journal Volumes

ISSN

2159-6867
2159-6859

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2023 - 20253
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Publications 1 - 3 of 3
  • Multi-scale mechanical microscopy via displacement-controlled, high-speed nanoindentation mapping
    Item type: Journal Article
    Wheeler, Jeffrey Martin; Basu, Indranil; Löffler, Jörg F. (2025)
    MRS Communications
    Mechanical microscopy allows for the imaging of mechanical properties at multiple length scales. Nanoindentation mapping is usually performed at the microstructural scale, but many manufacturing processes create property variations on larger scales. Using displacement-controlled nanoindentation mapping, multi-scale mechanical microscopy can be performed to connect large-scale variations in mechanical properties to those occurring on the microstructural scale. In this work, a nanoindentation mapping method is applied over three orders of magnitude in lateral resolution on a case-hardened medium-carbon steel. A Gaussian mixture machine-learning algorithm is employed to extract the properties of each phase as a function of length scale.
  • Morphology, structure, and dynamics of ionic polydimethylsiloxane-silica nanocomposites
    Item type: Journal Article
    Karatrantos, Argyrios V.; Bouhala, Lyazid; Bick, Andreas; et al. (2024)
    MRS Communications
    In this paper, we investigate the morphology of ionic poly(dimethylsiloxane) silica nanocomposites of randomly grafted or chain-end-functionalized ionic PDMS melts using atomistic MD simulations. The localization of the charge alters the structure and dynamics of ionic PDMS chains near the nanosilica surface. The chain-end ionic PDMS obtains the largest dimensions, whereas the charge fraction of 10% of the random ionic copolymers leads to a contraction of PDMS chains. The charge fraction dramatically alters the dynamics of the ionic PDMS chains, although they reach the diffusive regime. An anisotropy of PDMS chain dynamics perpendicular and parallel to the nanosilica and an heterogeneity of PDMS dynamics from the nanosilica surface are observed for the longer randomly grafted and chain-end ionic PDMS chains. The longer randomly grafted ionic PDMS chains are strongly adsorbed in the vicinity of the nanosilica surface.
  • A review of materials used in tomographic volumetric additive manufacturing
    Item type: Review Article
    Madrid-Wolff, Jorge; Toombs, Joseph; Rizzo, Riccardo; et al. (2023)
    MRS Communications
    Volumetric additive manufacturing is a novel fabrication method allowing rapid, freeform, layer-less 3D printing. Analogous to computer tomography (CT), the method projects dynamic light patterns into a rotating vat of photosensitive resin. These light patterns build up a three-dimensional energy dose within the photosensitive resin, solidifying the volume of the desired object within seconds. Departing from established sequential fabrication methods like stereolithography or digital light printing, volumetric additive manufacturing offers new opportunities for the materials that can be used for printing. These include viscous acrylates and elastomers, epoxies (and orthogonal epoxy-acrylate formulations with spatially controlled stiffness) formulations, tunable stiffness thiol-enes and shape memory foams, polymer derived ceramics, silica-nanocomposite based glass, and gelatin-based hydrogels for cell-laden biofabrication. Here we review these materials, highlight the challenges to adapt them to volumetric additive manufacturing, and discuss the perspectives they present.
Publications 1 - 3 of 3