Viscoelastic properties of microgel thin films control fibroblast modes of migration and pro-fibrotic responses

Biomaterials ◽  
2018 ◽  
Vol 185 ◽  
pp. 371-382 ◽  
Author(s):  
Daniel Chester ◽  
Rahul Kathard ◽  
Jeremy Nortey ◽  
Kimberly Nellenbach ◽  
Ashley C. Brown
Keyword(s):  
Thin Films ◽  
Viscoelastic Properties ◽  
Control Fibroblast

Non-Contact Real-Time Evaluation of Polyimide Thin Film Thermoelastic Properties Through Impulsive Stimulated Thermal Scattering

1992 ◽  
Vol 284 ◽  
Author(s):  
J. A. Rogers ◽  
A. R. Duggal ◽  
K. A. Nelson
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Real Time ◽  
Viscoelastic Properties ◽  
Thermoelastic Properties ◽  
Substrate Adhesion ◽  
Thermal Scattering ◽  
Film Substrate ◽  
Time Evaluation

ABSTRACTWe demonstrate a new purely optical based method for the excitation and detection of acoustic and thermal disturbances in thin films. This technique is applied to the determination of the viscoelastic properties of unsupported and silicon supported polyimide thin (∼1 micron) films. We show how this technique can be used to detect film delaminations and suggest how it may be used to probe film-substrate adhesion quality.

Viscoelastic properties of thin films probed with a quartz-crystal resonator

1992 ◽  
Vol 46 (12) ◽  
pp. 7808-7815 ◽  
Author(s):  
D. Johannsmann ◽  
K. Mathauer ◽  
G. Wegner ◽  
W. Knoll
Keyword(s):  
Thin Films ◽  
Viscoelastic Properties ◽  
Quartz Crystal ◽  
Quartz Crystal Resonator ◽  
Crystal Resonator

Characterizing the Viscoelastic Properties of Hydrogel Thin Films by Bulge Test

2017 ◽  
Vol 84 (6) ◽  
Author(s):  
Chen Yanfei ◽  
Ai Shigang ◽  
Tang Jingda ◽  
Pei Yongmao ◽  
Tang Liqun ◽  
...  
Keyword(s):  
Thin Films ◽  
Viscoelastic Properties ◽  
Polymeric Films ◽  
Poly Vinyl Alcohol ◽  
Bulge Test ◽  
Loading Conditions ◽  
Spherical Cap ◽  
Polymeric Thin Films ◽  
Step Loading ◽  
Constitutive Parameters

In this work, we carried out bulge test for quantifying the viscoelastic properties of poly (vinyl alcohol) (PVA) thin films with custom-developed apparatus. A viscoelastic bulge deformation (VBD) model based on the elasticity–viscoelasticity correspondence principle and spherical cap equation is established to describe the bulge deformation of polymeric thin films. The VBD model can be used to determine the time-dependent modulus by bulge test for polymeric films. Uniaxial compressive relaxation test and PRONY series fitting method are used to define the constitutive parameters of the VBD equations. We presented two types of VBD models in frequency domain under linear loading and step loading conditions. Through inverse Laplace transformation, the proposed VBD model can effectively predict the bulge deformation of PVA hydrogel thin film. Numerical simulations are also conducted to validate the VBD model under step loading conditions. This work provides a methodology to characterize the viscoelastic properties of polymeric films by bulge test.

Viscoelastic properties of thin films studied with quartz crystal resonators

1997 ◽  
Vol 107 ◽  
pp. 91-104 ◽  
Author(s):  
Oliver Wolff ◽  
Eberhard Seydel ◽  
Diethelm Johannsmann
Keyword(s):  
Thin Films ◽  
Viscoelastic Properties ◽  
Quartz Crystal ◽  
Quartz Crystal Resonators

Physical Characterization Of Microelectronic Polymeric Thin Films

1991 ◽  
Vol 227 ◽  
Author(s):  
Stephen D. Senturia ◽  
Susan C. Noe ◽  
Jeffrey Y. Pan
Keyword(s):  
Thin Films ◽  
Residual Stress ◽  
Viscoelastic Properties ◽  
Index Of Refraction ◽  
Physical Characterization ◽  
Optical Methods ◽  
Technical Problems ◽  
Polymeric Thin Films ◽  
Membrane Methods

ABSTRACTThe measurement of the mechanical properties and adhesion of polymeric thin films and coatings poses a number of technical problems. Elastic and viscoelastic properties, residual stress, adhesion, the effects of extended cure, and the effects of adsorbed moisture and process reagents are all critical. A particular challenge is to develop measurement methods which can be used with actual samples, preferably non-destructively. This paper examines a number of methods which have been developed to make these measurements, with emphasis on methods which are sensitive enough to look at the effects of process variation and the effects of moisture exposure. Suspended-membrane methods for measuring elastic and viscoelastic properties, residual stress, and adhesion are combined with optical methods for determining index of refraction and birefringence to yield a family of techniques for performing physical characterization. Recent results on the effects of extended cure and moisture uptake on elastic properties, residual stress, and optical properties will be presented.

scholarly journals Investigating the relationship between the mechanical properties of plasma polymer-like thin films and their glass transition temperature

Soft Matter ◽  
2021 ◽  
Author(s):  
Nathan Vinx ◽  
Pascal Damman ◽  
Philippe Leclere ◽  
Bruno Bresson ◽  
Christian Frétigny ◽  
...  
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Substrate Temperature ◽  
Viscoelastic Properties ◽  
State Of The Art ◽  
Plasma Polymer ◽  
The Relationship

This work aims at understanding the influence of the substrate temperature (Ts) on the viscoelastic properties of propanethiol plasma polymer films (PPF). By means of state-of-the-art AFM characterization-based techniques including...

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