Thermomechanical Formation and Recovery of Nanoindents in a Shape Memory Polymer Studied Using a Heated Tip

Yang, Fei; Wornyo, Edem; Gall, Ken; King, William P.

doi:10.1002/sca.20074

Cited by 20 publications

(8 citation statements)

References 18 publications

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“…The cross-bridges (actin and myosin) cycling in the overlap zone are not so stable in elasticity which depends on sarcomere locations, physiological conditions and sources of muscle fibers. Secondly, compression of nano-scale AFM tips onto micro-scale fibers is not an ideal linear process essentially (Yang et al, 2008; Feng et al, 2008). So, the indentation of sharp tips would affect the mechanical properties of the fibers obviously in the initial stages, and the geometry of tips would also influence the measurement of elasticity.…”

Section: Discussionmentioning

confidence: 99%

Topographic mapping and compression elasticity analysis of skinned cardiac muscle fibers in vitro with atomic force microscopy and nanoindentation

Zhu

Sabharwal

Kalyanasundaram

et al. 2009

Journal of Biomechanics

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Surface topography and compression elasticity of bovine cardiac muscle fibers in rigor and relaxing state has been studied with atomic force microscopy. Characteristic sarcomere patterns running along the longitudinal axis of the fibers were clearly observed, and Z-lines, M-lines, I-bands, and A-bands can be distinguished through comparing with TEM images and force curves. AFM height images of fibers had shown a sarcomere length of 1.22±0.02μm (n=5) in rigor with a significant 9% increase in sarcomere length in relaxing state (1.33±0.03μm, n=5), indicating that overlap move with the changing physiological conditions. Compression elasticity curves along with sarcomere locations have been taken by AFM compression processing. Coefficient of Z-line, I-band, Overlap, and M-line are 25±2pN/nm, 8±1pN/nm, 10±1pN/nm, and 17±1.5pN/nm respectively in rigor state, and 18±2.5pN/nm, 4±0.5pN/nm, 6±1pN/nm, and 11±0.5pN/nm respectively in relaxing state. Young’s Modulus in Z-line, I-band, Overlap, and M-line are 115±12kPa, 48±9kPa, 52±8kPa, and 90±12kPa respectively in rigor, and 98±10kPa, 23±4kPa, 42±4kPa, and 65±7kPa respectively in relaxing state. The elasticity curves has shown a similar appearance to the section analysis profile of AFM height images of sarcomere and the distance between adjacent largest coefficient and Young’s Modulus is equal to the sarcomere length measured from the AFM height images using section analysis, indicating that mechanic properties of fibers have a similar periodicity to the topography of fibers.

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Section: Discussionmentioning

confidence: 99%

Topographic mapping and compression elasticity analysis of skinned cardiac muscle fibers in vitro with atomic force microscopy and nanoindentation

Zhu

Sabharwal

Kalyanasundaram

et al. 2009

Journal of Biomechanics

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“…Nano‐TA is an AFM based thermo‐mechanical analytical technique, recently introduced by Anasys. With the help of additional accessories this technique enables an AFM to measure a material's thermal properties in a sub‐100 nm localized area . Using the optical resolution of the AFM, a specially manufactured doped silicon probe with tip radius < 30 nm is put in contact at a desired location and heated at a rapid heating rate.…”

Section: Methodsmentioning

confidence: 99%

Forensic analysis of degraded polypropylene hollow fibers utilized in microfiltration

Lu¹,

Shah

Maruf³

et al. 2014

J of Applied Polymer Sci

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Numerous polypropylene hollow fiber microfiltration membrane modules were severely degraded after utilization as pretreatment in a military water purification system. To determine the plausible causes of degradation, thermal, chemical, and mechanical material properties were initially evaluated by using differential scanning calorimetry, thermogravimetric analysis, 13C solid‐state nuclear magnetic resonance, attenuated total reflectance infrared spectroscopy, and a tensile strength material testing system. The evaluation implied oxidation during the usage or storage of the samples. Protocols using more specialized techniques, micro‐Raman spectroscopy along with energy dispersive X‐ray spectroscopy and an atomic force microscope‐based nano‐thermal analysis, were developed to examine the chemical and thermal properties along the cross‐section of the samples at the micron and submicron‐scale. These results indicated that the degradation mainly took place at the outer and inner boundaries of the samples. Pristine samples exposed to several plausibly harsh environments did not evidence the same level of mechanical failure, but a few circumstances had similar test responses, leading to a hypothesis of high oxidative stress as the main failure etiology versus a slowly evolving one. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41553.

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“…Despite these common purposes, there is a lack of consensus on the measurement and treatment methods used for the study of the imprint indentation. There are several measurement means: some studies are primarily focused on the use of optical microscopy (Yang et al ., ), scanning electron microscopy (SEM) (Dwyer‐Joyce et al ., ), or confocal microscopy (Santos et al ., ; Keryvin, ), while others are based on profile measurement (Hainsworth et al ., ), atomic force microscopy (AFM) measurements (Yang et al ., ) or interferometric microscopy (Su et al ., ; Marteau et al ., ). It is worth noting that most of the studies rely on qualitative information.…”

Section: Introductionmentioning

confidence: 99%

Reflection on the measurement and use of the topography of the indentation imprint

et al. 2013

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The goal of this paper is to study the main uses of the residual imprint of the indentation test. It also discusses the different technologies and methods employed in this context. The difficulties encountered when trying to exploit the full potentials of the imprint are thoroughly examined. A survey of the literature on the quantification of the pile-up clearly shows that there is a lack of consensus on the measurement of the residual imprint as well as on treatment methods. Therefore, in order to widen the application fields of the indentation residual imprint, relevant and standardized indicators should be established.

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Thermomechanical Formation and Recovery of Nanoindents in a Shape Memory Polymer Studied Using a Heated Tip

Cited by 20 publications

References 18 publications

Topographic mapping and compression elasticity analysis of skinned cardiac muscle fibers in vitro with atomic force microscopy and nanoindentation

Topographic mapping and compression elasticity analysis of skinned cardiac muscle fibers in vitro with atomic force microscopy and nanoindentation

Forensic analysis of degraded polypropylene hollow fibers utilized in microfiltration

Reflection on the measurement and use of the topography of the indentation imprint

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