Tomography of Electrospun Carbon Nanotube Polymeric Blends by Focus Ion Beam: Alignment and Phase Separation Analysis from Multicontrast Electron Imaging

Campo, Eva M.; Yates, Douglas M.; Berson, Benjamin; Rojas, Wudmir Y.; Winter, A. Douglas; Ananth, M.V.; Santiago-Avilés, Jorge J.; Terentjev, E. M.

doi:10.1002/mame.201600479

Cited by 4 publications

(2 citation statements)

References 41 publications

(72 reference statements)

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“…A similar protocol has also been used to understand the interaction between osteoblasts and PLGA fibers [211,212]. The Campo group were successful in the alignment and the phase separation analysis of a polydimethylsiloxane/poly(methyl methacrylate) PMMA/multiwall carbon nanotube (MWCNT) electrospun composite [213], resolving the contrast mechanism between the polymer and the MWCNT by synchrotron spectroscopy and helium microscopy. Diblìkovà and co-authors published a paper in which they reconstructed three mixed-matrix membranes of polymide-silicalite [214].…”

Section: Fibers and Polymersmentioning

confidence: 99%

Advances in Focused Ion Beam Tomography for Three-Dimensional Characterization in Materials Science

Mura,

Cognigni,

Ferroni

et al. 2023

Materials

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Over the years, FIB-SEM tomography has become an extremely important technique for the three-dimensional reconstruction of microscopic structures with nanometric resolution. This paper describes in detail the steps required to perform this analysis, from the experimental setup to the data analysis and final reconstruction. To demonstrate the versatility of the technique, a comprehensive list of applications is also summarized, ranging from batteries to shale rocks and even some types of soft materials. Moreover, the continuous technological development, such as the introduction of the latest models of plasma and cryo-FIB, can open the way towards the analysis with this technique of a large class of soft materials, while the introduction of new machine learning and deep learning systems will not only improve the resolution and the quality of the final data, but also expand the degree of automation and efficiency in the dataset handling. These future developments, combined with a technique that is already reliable and widely used in various fields of research, are certain to become a routine tool in electron microscopy and material characterization.

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Section: Fibers and Polymersmentioning

confidence: 99%

Advances in Focused Ion Beam Tomography for Three-Dimensional Characterization in Materials Science

Mura,

Cognigni,

Ferroni

et al. 2023

Materials

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show abstract

“…Although SEM could give information about the morphology of UHMWPE‐based blends, they cannot directly provide related information on the chemical components within the blends and well defined structures of the blends with no obvious phase separation. In the recent reports, multicontrast electron imaging, high‐resolution Kelvin probe force microscopy imaging, and two‐dimensional polarization imaging (2D‐POLIM) techniques have also been employed to characterize the polymer blends from different views . However, they are mostly complex and difficult to operate in use.…”

Section: Introductionmentioning

confidence: 99%

Morphology characterization and the phase separation behavior of UHMWPE/recycled‐PA6 blends using FTIR imaging and thermomechanical analysis

et al. 2018

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Phase morphology and phase separation behavior are always important factors affecting polymer blends' properties. Here, we employed FTIR imaging technique and thermomechanical analysis (TMA) to characterize the phase morphology and phase separation behavior of ultra-high molecular weight polyethylene (UHMWPE)/ recycled-polyamide 6 (R-PA6) blends, which were prepared via extrusion using high-density polyethylene-graft-maleic anhydride (HDPE-g-MAH) as the compatibilizer. The crystallization and thermal properties of UHMWPE/R-PA6/HDPE-g-MAH were discussed from the viewpoint of phase behavior of the blend. Morphology characterization and TMA analysis indicated that UHMWPE and R-PA6 were thermodynamically incompatible phases, and R-PA6 phase was continuous and UHMWPE phase was dispersed phased, respectively. X-ray diffraction results showed that the interaction between the blending components adversely affected the crystal growth of the components, resulting in reduced crystallization in the blends.It was demonstrated that the morphology and phase separation behavior of the components affected the thermal properties of the blends. K E Y W O R D SFTIR imaging, morphology, phase separation behavior, TMA, UHMWPE/R-PA6

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Carbon Nanotubes Facilitate Silk Hierarchical Assembly by Dry Drawing

Wan,

Farr,

et al. 2024

Small Structures

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Biologically derived hierarchical structural materials not only boast energy‐efficient processing but also exhibit impressive mechanical performance. Silk stands as the gold standard in hierarchical fiber production, leveraging a unique combination of advantages. Nevertheless, the artificial replication of silk poses technical challenges related to precision processing and comprehensive molecular control. To address such issues, this study investigates the hierarchical assembly of solid regenerated silk in an air atmosphere, facilitated by the incorporation of carbon nanotube (CNT) seeding. Results obtained highlight that this CNT seeding facilitates multiscale structure development in response to post‐spin tensile stress. Such CNT bridged structure assembly bypasses some natural processing control variables (pH, ions) and the necessary solvent immersed state for conventional silk post‐drawing. Combining secondary electron hyperspectral imaging and 3D synchrotron X‐ray ptychotomography, this study reports silk protein conversion from a disordered as‐spun state to a longitudinal orientated semi‐crystalline nano structure during drawing. The development of microscale structure during the drawing process is attributed to the presence of CNTs, yielding mechanical properties comparable to, and frequently surpassing, those exhibited by native fibers. These findings collectively propose a framework for exploring novel processing routes and offer a practical means controlling self‐assembly in silk materials.

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Tomography of Electrospun Carbon Nanotube Polymeric Blends by Focus Ion Beam: Alignment and Phase Separation Analysis from Multicontrast Electron Imaging

Cited by 4 publications

References 41 publications

Advances in Focused Ion Beam Tomography for Three-Dimensional Characterization in Materials Science

Advances in Focused Ion Beam Tomography for Three-Dimensional Characterization in Materials Science

Morphology characterization and the phase separation behavior of UHMWPE/recycled‐PA6 blends using FTIR imaging and thermomechanical analysis

Carbon Nanotubes Facilitate Silk Hierarchical Assembly by Dry Drawing

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