On the determination of Poisson’s ratio of stressed monolayer and bilayer submicron thick films

Martins, Paulo Sérgio; Malhaire, C.; Brida, S.; Barbier, D.

doi:10.1007/s00542-009-0822-5

Cited by 7 publications

(4 citation statements)

References 17 publications

(32 reference statements)

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“…The Poisson’s ratio of a multilayer film of randomly oriented NFC with PEI thus falls in the range of 0.30 to 0.37, which does not change the calculate E f value outside of the ±0.2 GPa error interval reported. Poisson’s ratios for submicrometer thick films can sometimes be determined using bulge tests or digital speckle photography, and the need to determine the exact Poisson’s ratio for NFC, PEI, and the multilayer film is apparent, however, it was beyond the scope of the present work.…”

Section: Resultsmentioning

confidence: 99%

Determination of Young’s Modulus for Nanofibrillated Cellulose Multilayer Thin Films Using Buckling Mechanics

et al. 2011

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The Young's modulus of multilayer films containing nanofibrillated cellulose (NFC) and polyethyleneimine (PEI) was determined using the strain-induced elastic buckling instability for mechanical measurements (SIEBIMM) technique. (1) Multilayer films were built up on polydimethylsiloxane substrates using electrostatic layer-by-layer assembly. At 50% relative humidity, SIEBIMM gave a constant Young's modulus of 1.5 ± 0.2 GPa for 35-75 nm thick films. Conversely, in vacuum, the Young's modulus was 10 times larger, at 17.2 ± 1.2 GPa. A slight decrease in buckling wavelength with increasing strain was observed by scanning electron microscopy with in situ compression, and above 10% strain, extensive cracking parallel to the compressive direction occurred. We conclude that whereas PEI acts as a "glue" to hold multiple layers of NFC together, it prevents full development of hydrogen bonding and specific fibril-fibril interactions, and at high humidity, its hygroscopic nature decreases the elastic modulus when compared with pure NFC films.

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Section: Resultsmentioning

confidence: 99%

Determination of Young’s Modulus for Nanofibrillated Cellulose Multilayer Thin Films Using Buckling Mechanics

et al. 2011

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“…Estimates for the Young’s modulus of membranes have been provided by experiments (Tierney et al, 2005 ; Popescu et al, 2006 ). However, the measuring of the Poisson’s ratio is not straightforward, due to the small thickness of membranes in the nanometer range (Mitchell et al, 2003 ; Martins et al, 2009 ). From the theoretical aspect, mechanical properties of lipid membranes are commonly investigated based on the Helfrich Hamiltonian.…”

Section: Introductionmentioning

confidence: 99%

Poissonâ€™s Ratio and Youngâ€™s Modulus of Lipid Bilayers in Different Phases

Jadidi

Seyyed-Allaei

Tabar

et al. 2014

Front. Bioeng. Biotechnol.

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A general computational method is introduced to estimate the Poisson’s ratio for membranes with small thickness. In this method, the Poisson’s ratio is calculated by utilizing a rescaling of inter-particle distances in one lateral direction under periodic boundary conditions. As an example for the coarse grained lipid model introduced by Lenz and Schmid, we calculate the Poisson’s ratio in the gel, fluid, and interdigitated phases. Having the Poisson’s ratio, enable us to obtain the Young’s modulus for the membranes in different phases. The approach may be applied to other membranes such as graphene and tethered membranes in order to predict the temperature dependence of its Poisson’s ratio and Young’s modulus.

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“…The applied pressure ranges from 0 to 500 mbar in order to remain in the elastic domain, and the resulting membrane deflection is measured by using a WYCO NT1100 white-light interferometer microscope [6].…”

Section: Nanoindentation Bulge-test and Microtensile Test : Experimementioning

confidence: 99%

Inﬂuence of microstructure and internal stress on the mechanical behavior of electroplated gold freestanding thin ﬁlms

Martegoutte

Seguineau²,

Fourcade

et al. 2010

EPJ Web of Conferences

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Abstract. Mechanical properties of freestanding electroplated gold thin films were studied in relationship to their geometrical and microstructural properties. Three different techniques of characterization were used: nanoindentation, bulge tests and microtensile tests. Results were compared to literature and also discussed according to physical phenomena related to the elaboration process of the specimens like seed layer exodiffusion or internal stress state. The observed plasticity and failure mechanisms were found to be in good agreement with the literature and are consistent with the microstructure. The measured Young's modulus is slightly higher than expected, and SIMS analysis is exploited to explain such a high value.

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On the determination of Poisson’s ratio of stressed monolayer and bilayer submicron thick films

Cited by 7 publications

References 17 publications

Determination of Young’s Modulus for Nanofibrillated Cellulose Multilayer Thin Films Using Buckling Mechanics

Determination of Young’s Modulus for Nanofibrillated Cellulose Multilayer Thin Films Using Buckling Mechanics

Poissonâ€™s Ratio and Youngâ€™s Modulus of Lipid Bilayers in Different Phases

Inﬂuence of microstructure and internal stress on the mechanical behavior of electroplated gold freestanding thin ﬁlms

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