Helium ion microscopy of electrospun CNT–polymer composites

Campo, Eva M.; Larios, Eduardo; Huynh, Chuong; Ananth, M.V.

doi:10.1557/jmr.2014.362

Cited by 8 publications

(10 citation statements)

References 38 publications

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“…We now explore the rationale responsible for CNTs contrast. We had proved earlier that CNTs have preferentially segregated to the PMMA phase (the darker contrast being associated with lower atomic number) through synchrotron spectroscopy, as well as by free energy considerations and further confirmed through Helium microscopy, as summarized in Figure . Indeed, last generation synchrotron spectroscopies are making outstanding strides in the field of tomography also in soft matter, such as the recently highlighted ptychography technique, enabling quantitative 3D density maps with resolutions below 3 nm.…”

Section: Resultssupporting

confidence: 56%

“…Schematic summarizing the types of contrast present in this study, where a–c) NEXAFS spectra correspond to PMMA, MWCNT, and composite, respectively . It can be seen that the spectrum in (c) corresponds mostly to the fingerprint of PMMA in (a), and the MWCNTs have preferentially migrated to the PMMA phase …”

Section: Resultsmentioning

confidence: 88%

“…Some CNTs are also observed protruding from the cross‐section (Figure c). Uncoated fibers were also imaged by He‐ion microscopy (Figure d), revealing previously unreported rippling contrast from the vicinity of surficial CNTs, whose origin has been attributed to drag effects of CNTs on the matrix upon collection . In fact, this rippling effect is observed topographically in Helium Ion Microscopy (HIM), as a consequence of preferential segregation of CNTs to PMMA in the electrospun fibers.…”

Section: Resultsmentioning

confidence: 95%

“…In particular, dispersion and alignment of nanofillers are believed to unlock dynamical properties, key to highly innovative phenomena such as mechanical actuation and plasmonics . Previously, we have demonstrated correlation between processing and alignment through synchrotron and Raman spectroscopies as well as atomic force and helium ion microscopies in the context of structural, and smart (i.e., mechanically actuating) systems …”

Section: Introductionmentioning

confidence: 99%

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

Campo

Yates

Berson

et al. 2017

Macro Materials & Eng

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Multimodal focused ion beam (FIB) imaging on a polydimethylsiloxane/poly(methyl methacrylate) (PMMA)/multiwall carbon nanotube (MWCNT) electrospun composite has been applied to discriminate the phase‐separated polymer blend and identify MWCNT fillers. Upon tomographic reconstruction, this discrimination has been possible through both atomic number and voltage contrast, the latter being enabled by preferential MWCNT segregation to PMMA. This study suggests that electrospinning could be affecting not only MWCNT alignment but also phase separation dynamics of immiscible polymers, yielding a porous structure throughout the fibers. This work opens the door to correlative materials science in polymer nanocomposites through FIB tomography, where voltage contrast is a main actor.

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Section: Resultssupporting

confidence: 56%

Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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

Campo

Yates

Berson

et al. 2017

Macro Materials & Eng

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“…For instance, in situ analysis methods such as surface-sensitive helium ion microscopy (He-IM) can shed light on relevant processes and interactions. He-IM has been successfully used by Campo et al [ 91 ] to investigate the interaction of carbon nanotubes (CNTs) and a poly(methyl methacrylate) (PMMA) matrix in an electrospun polymer-based nanocomposite.…”

Section: Advanced Characterization Of Nanocomposite Coatings For Corrmentioning

confidence: 99%

Polymer-Based Nanocomposite Coatings for Anticorrosion Applications

Nazari

Shi

2016

Industrial Applications for Intelligent Polymers and Coatings

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The successful use of polymeric coatings for corrosion prevention or mitigation is often hindered by their inherently porous microstructure that fails to resist the ingress of detrimental species and/or by their vulnerability to damage by surface abrasion, wear, or scratches. Incorporation of nanomaterials in polymeric coatings can greatly improve their barrier performance. While the last decade has seen a substantial amount of research on polymeric nanocomposite coatings, the knowledge underlying the critical roles nanomaterials play remains scattered. This chapter discusses the utilization of nanotechnology to greatly enhance the properties of polymer-based coatings for anticorrosion applications, by modifying the microstructure of the coating bulk or endowing it with additional functionality. It starts with a brief discussion of the relevant knowledge base, including: microstructure of polymer nanocomposites, infl uence of nanomodifi cation on properties of polymeric coatings, fabrication approaches, and the use of polymeric nanocoating as a carrier for corrosion inhibitors. It also provides a review of technological advances in the use of nanotechnology to produce high-performance polymeric coatings with outstanding corrosion resistance and other relevant properties. The chapter concludes with a snapshot review of the advanced characterization of nanocomposite coatings for corrosion protection.

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