Natalie Marie Larson

All Publications

• Opportunities at the frontier of multimaterial additive manufacturing with subvoxel control MRS BULLETIN Larson, N. M. 2024

  View details for DOI 10.1557/s43577-024-00829-z

  View details for Web of Science ID 001372711000001

• Reinforcement induced microcracking during the conversion of polymer-derived ceramics ACTA MATERIALIA O'Masta, M. R., Bui, P. P., Larson, N. M., Porter, K. A., Wernick, E. S., Stonkevitch, E., Eckel, Z. C., Schaedler, T. A. 2024; 275

  View details for DOI 10.1016/j.actamat.2024.120053

  View details for Web of Science ID 001251577400001

• Rotational multimaterial printing of filaments with subvoxel control. Nature Larson, N. M., Mueller, J., Chortos, A., Davidson, Z. S., Clarke, D. R., Lewis, J. A. 2023; 613 (7945): 682-688

  Abstract

  Helical structures are ubiquitous in nature and impart unique mechanical properties and multifunctionality1. So far, synthetic architectures that mimic these natural systems have been fabricated by winding, twisting and braiding of individual filaments1-7, microfluidics8,9, self-shaping1,10-13 and printing methods14-17. However, those fabrication methods are unable to simultaneously create and pattern multimaterial, helically architected filaments with subvoxel control in arbitrary two-dimensional (2D) and three-dimensional (3D) motifs from a broad range of materials. Towards this goal, both multimaterial18-23 and rotational24 3D printing of architected filaments have recently been reported; however, the integration of these two capabilities has yet to be realized. Here we report a rotational multimaterial 3D printing (RM-3DP) platform that enables subvoxel control over the local orientation of azimuthally heterogeneous architected filaments. By continuously rotating a multimaterial nozzle with a controlled ratio of angular-to-translational velocity, we have created helical filaments with programmable helix angle, layer thickness and interfacial area between several materials within a given cylindrical voxel. Using this integrated method, we have fabricated functional artificial muscles composed of helical dielectric elastomer actuators with high fidelity and individually addressable conductive helical channels embedded within a dielectric elastomer matrix. We have also fabricated hierarchical lattices comprising architected helical struts containing stiff springs within a compliant matrix. Our additive-manufacturing platform opens new avenues to generating multifunctional architected matter in bioinspired motifs.

  View details for DOI 10.1038/s41586-022-05490-7

  View details for PubMedID 36653452

• Programmed shape-morphing into complex target shapes using architected dielectric elastomer actuators. Science advances Hajiesmaili, E., Larson, N. M., Lewis, J. A., Clarke, D. R. 2022; 8 (28): eabn9198

  Abstract

  Dielectric elastomer actuators (DEAs) are among the fastest and most energy-efficient, shape-morphing materials. To date, their shapes have been controlled using patterned electrodes or stiffening elements. While their actuated shapes can be analyzed for prescribed configurations of electrodes or stiffening elements (the forward problem), the design of DEAs that morph into target shapes (the inverse problem) has not been fully addressed. Here, we report a simple analytical solution for the inverse design and fabrication of programmable shape-morphing DEAs. To realize the target shape, two mechanisms are combined to locally control the actuation magnitude and direction by patterning the number of local active layers and stiff rings of varying shapes, respectively. Our combined design and fabrication strategy enables the creation of complex DEA architectures that shape-morph into simple target shapes, for instance, those with zero, positive, and negative Gaussian curvatures as well as complex shapes, such as a face.

  View details for DOI 10.1126/sciadv.abn9198

  View details for PubMedID 35857528

  View details for PubMedCentralID PMC9286497

• Cracking during pyrolysis of preceramic polymers within glass microtubes JOURNAL OF THE AMERICAN CERAMIC SOCIETY Larson, N. M., Summers, W. D., Zok, F. W. 2022; 105 (5): 3211-3225

  View details for DOI 10.1111/jace.18326

  View details for Web of Science ID 000744585800001

• X-ray computed tomography of microstructure evolution during matrix impregnation and curing in unidirectional fiber beds COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING Larson, N. M., Cuellar, C., Zok, F. W. 2019; 117: 243-259

  View details for DOI 10.1016/j.compositesa.2018.11.021

  View details for Web of Science ID 000457664400022

• Insights from <i>in</i>-<i>situ</i> X-ray computed tomography during axial impregnation of unidirectional fiber beds COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING Larson, N. M., Zok, F. W. 2018; 107: 124-134

  View details for DOI 10.1016/j.compositesa.2017.12.024

  View details for Web of Science ID 000429892800014

• <i>In-situ</i> 3D visualization of composite microstructure during polymer-to-ceramic conversion ACTA MATERIALIA Larson, N. M., Zok, F. W. 2018; 144: 579-589

  View details for DOI 10.1016/j.actamat.2017.10.054

  View details for Web of Science ID 000424067100053

• Insight into 3D micro-CT data: exploring segmentation algorithms through performance metrics. Journal of synchrotron radiation Perciano, T., Ushizima, D., Krishnan, H., Parkinson, D., Larson, N., Pelt, D. M., Bethel, W., Zok, F., Sethian, J. 2017; 24 (Pt 5): 1065-1077

  Abstract

  Three-dimensional (3D) micro-tomography (µ-CT) has proven to be an important imaging modality in industry and scientific domains. Understanding the properties of material structure and behavior has produced many scientific advances. An important component of the 3D µ-CT pipeline is image partitioning (or image segmentation), a step that is used to separate various phases or components in an image. Image partitioning schemes require specific rules for different scientific fields, but a common strategy consists of devising metrics to quantify performance and accuracy. The present article proposes a set of protocols to systematically analyze and compare the results of unsupervised classification methods used for segmentation of synchrotron-based data. The proposed dataflow for Materials Segmentation and Metrics (MSM) provides 3D micro-tomography image segmentation algorithms, such as statistical region merging (SRM), k-means algorithm and parallel Markov random field (PMRF), while offering different metrics to evaluate segmentation quality, confidence and conformity with standards. Both experimental and synthetic data are assessed, illustrating quantitative results through the MSM dashboard, which can return sample information such as media porosity and permeability. The main contributions of this work are: (i) to deliver tools to improve material design and quality control; (ii) to provide datasets for benchmarking and reproducibility; (iii) to yield good practices in the absence of standards or ground-truth for ceramic composite analysis.

  View details for DOI 10.1107/S1600577517010955

  View details for PubMedID 28862630

• Synchrotron X-ray micro-tomography at the Advanced Light Source: Developments in high-temperature in-situ mechanical testing Barnard, H. S., MacDowell, A. A., Parkinson, D. Y., Mandal, P., Czabaj, M., Gao, Y., Maillet, E., Blank, B., Larson, N. M., Ritchie, R. O., Gludovatz, B., Acevedo, C., Liu, D., Rau, C. IOP PUBLISHING LTD. 2017

  View details for DOI 10.1088/1742-6596/849/1/012043

  View details for Web of Science ID 000412800900043

• High Temperature X-Ray Micro-Tomography MacDowell, A. A., Barnard, H., Parkinson, D. Y., Haboub, A., Larson, N., Zok, F., Parerai, F., Mansour, N. N., Bale, H., Gludovatz, B., Acevedo, C., Liu, D., Ritchie, R. O., Shen, Q., Nelson, C. AMER INST PHYSICS. 2016

  View details for DOI 10.1063/1.4952925

  View details for Web of Science ID 000383222800146