Measuring the viscoelastic creep of soft samples by step response AFM

Soft Matter ◽  
2016 ◽  
Vol 12 (40) ◽  
pp. 8297-8306 ◽  
Author(s):  
Achu Yango ◽  
Jens Schäpe ◽  
Carmela Rianna ◽  
Holger Doschke ◽  
Manfred Radmacher
Keyword(s):  
Step Response ◽  
Viscoelastic Creep ◽  
Soft Samples

FIELD AND TEMPERATURE STEP RESPONSE OF THE AC AND DC SUSCEPTIBILITY IN THE SPIN GLASS HoRhySnz

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1039-C8-1040
Author(s):  
A. W. M. van de Pasch ◽  
F. J. Lázaro ◽  
P. J. Martinez ◽  
M. Castro ◽  
J. Flokstra
Keyword(s):  
Spin Glass ◽  
Step Response ◽  
Temperature Step

Data-driven I-PD Gain Tuning using Closed-loop Step Response Data

2019 ◽  
Vol 139 (8) ◽  
pp. 882-888
Author(s):  
Shiro Masuda ◽  
Jongho Park ◽  
Yoshihiro Matsui
Keyword(s):  
Closed Loop ◽  
Data Driven ◽  
Step Response ◽  
Response Data

Analysis of Reset Control Systems Consisting of a FORE and Second-Order Loop1

2001 ◽  
Vol 123 (2) ◽  
pp. 279-283 ◽  
Author(s):  
Qian Chen ◽  
Yossi Chait ◽  
C. V. Hollot
Keyword(s):  
Control Systems ◽  
Closed Loop ◽  
Second Order ◽  
Step Response ◽  
Steady State Response ◽  
First Order ◽  
State Response ◽  
Loop Transfer Function ◽  
Performance Specifications ◽  
Reset Control

Reset controllers consist of two parts—a linear compensator and a reset element. The linear compensator is designed, in the usual ways, to meet all closed-loop performance specifications while relaxing the overshoot constraint. Then, the reset element is chosen to meet this remaining step-response specification. In this paper, we consider the case when such linear compensation results in a second-order (loop) transfer function and where a first-order reset element (FORE) is employed. We analyze the closed-loop reset control system addressing performance issues such as stability, steady-state response, and transient performance.

Scanning Ion Conductance Microscopy for High-Resolution Topography of Soft Samples Including Live Cells

2011 ◽  
Vol 17 (S2) ◽  
pp. 236-237
Author(s):  
G De Filippi ◽  
C Moore
Keyword(s):  
High Resolution ◽  
Live Cells ◽  
Ion Conductance ◽  
Scanning Ion Conductance Microscopy ◽  
Soft Samples

Extended abstract of a paper presented at Microscopy and Microanalysis 2011 in Nashville, Tennessee, USA, August 7–August 11, 2011.

Numerical Analysis of the Tapping Atomic Force Microscopy on a Viscoelastic Sample

2014 ◽  
Author(s):  
Ben Carmichael ◽  
Gary Frey ◽  
S. Nima Mahmoodi
Keyword(s):  
Numerical Analysis ◽  
Time History ◽  
Equation Of Motion ◽  
Viscous Effects ◽  
Force Microscopy ◽  
Forcing Function ◽  
Atomic Force ◽  
Cantilevered Beam ◽  
Soft Samples ◽  
The Galerkin Method

Mechanical characterization of thin samples is now routine due to the prominence of the Atomic Force Microscope. Advances in amplitude modulation techniques have allowed for accurate measurement of a sample’s elastic properties by interpreting the changes in the vibration of a cantilevered beam in intermittent contact. However, the nonlinearities associated with contact complicate attempts to find an accurate time-history for the beam. Furthermore, the inclusion of viscous effects, common to soft samples, puts an explicit solution even farther from reach. A numerical method is proposed that analyzes the time-history and frequency response of a microcantilever beam with a viscoelastic end-condition. The mathematics can be simplified by incorporating the viscoelastic end-condition into the equation of motion directly by modeling it as a distributed load. A forcing function can then be derived from the Standard Linear Solid model of viscoelasticity and implemented in the non-conservative work term of Hamilton’s principle. The Galerkin method can separate the resulting nonlinear equation of motion into time and space components. Performing a numerical analysis of the time factor equation provide the beam’s response over time. The results demonstrate the distinctive effects of viscoelasticity and periodic contact on the beam’s motion and provide the framework for the determination of viscous properties using dynamic techniques.

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