Modeling the mechanical properties of ultra-thin polymer films

Abstract

A modeling method to extract the mechanical properties of ultra-thin films (10-100 nm thick) from experimental data generated by indentation of freestanding circular films using a spherical indenter is presented. The relationship between the mechanical properties of the film and experimental parameters including load, and deflection are discussed in the context of a constitutive material model, test variables, and analytical approaches. Elastic and plastic regimes are identified by comparison of finite element simulation and experimental data.

Liquid-Free Covalent Reinforcement of Carbon Nanotube Dry-Spun Yarns and Free-Standing Sheets

“…This ensemble moves normal to a high-precision balance (Mettler-Toledo WM124-122 with a 121 g load cell and 0.1 mg resolution) that doubles as substrate holder and records the force exerted during the mechanical tests. Further details of the setup of our test system are described elsewhere [42,43]. Both displacement and force are recorded as function of time to generate stress-strain curves of materials under displacement control.…”

Review of HPLSE special issue on target fabrication

“…Papers on metrology cover a wide range of disciplines within target fabrication, detailing the measurement of adhesive wicking into foams [18] , the mechanical properties of ultra-thin polymer films [19] and the surface characterization of ICF capsules [7] .…”

“…Assembly and metrology of NIF target subassemblies using robotic systems [8] 18. Modeling the mechanical properties of ultra-thin polymer films [19] 19. X-ray computed tomography of adhesive wicking into carbon foam [18] Review of HPLSE special issue on target fabrication…”

“…Submissions for the special issue covered the invited topics and also branched out into broader areas and capabilities. Papers described research on: techniques for the production of targets for inertial confinement fusion (ICF) [1][2][3][4][5][6][7][8] , micro-assembly [3,8,9] , liquid targets [10] , systems for delivery of targets at high repetition rates [5,11,12] , fundamental target fabrication processes [2,4,[13][14][15][16] , low density materials [15,17,18] and metrology methods [7,18,19] . In addition, there were three important review papers [1,5,12] that give an excellent snapshot of the current capabilities across the world.…”

“…Special issue content Development of target fabrication for laser-driven inertial confinement fusion at research center of laser fusion [1] Permeation fill-tube design for inertial confinement fusion target capsules [2] Fluid sample injectors for X-ray free electron laser at SACLA [10] Efficient offline production of freestanding thin plastic foils for laser-driven ion sources [13] A new spatial angle assembly method of the ICF target [3] An investigation progress toward Be-based ablator materials for the inertial confinement fusion [4] Review on high repetition rate and mass production of the cryogenic targets for laser IFE [5] An automated, 0.5 Hz nano-foil target positioning system for intense laser plasma experiments [11] Laser-induced microstructures on silicon for laser-driven acceleration experiments [14] Developing targets for radiation transport experiments at the Omega laser facility [15] Targets for high repetition rate laser facilities: needs, challenges and perspectives [12] Large-area suspended graphene as a laser target to produce an energetic ion beam [16] Importance of limiting hohlraum leaks at cryogenic temperatures on NIF targets [6] Surface characterization of ICF capsule by AFM-based profilometer [7] Design and fabrication of gas cell targets for laboratory astrophysics experiments on the Orion high-power laser facility [9] REACH compliant epoxides used in the synthesis of Fe(III)-based aerogel monoliths for target fabrication [17] Assembly and metrology of NIF target subassemblies using robotic systems [8] Modeling the mechanical properties of ultra-thin polymer films [19] X-ray computed tomography of adhesive wicking into carbon foam [18] …”