scholarly journals Study of buckling behavior at the nanoscale through capillary adhesion force

2018 ◽  
Vol 112 (19) ◽  
pp. 193102 ◽  
Author(s):  
Matteo Lorenzoni ◽  
Jordi Llobet ◽  
Francesc Perez-Murano
Keyword(s):  
Adhesion Force ◽  
Capillary Adhesion ◽  
Buckling Behavior

scholarly journals The capillary adhesion technique: a versatile method for determining the liquid adhesion force and sample stiffness

2015 ◽  
Vol 6 ◽  
pp. 11-18 ◽  
Author(s):  
Daniel Gandyra ◽  
Stefan Walheim ◽  
Stanislav Gorb ◽  
Wilhelm Barthlott ◽  
Thomas Schimmel
Keyword(s):  
Elastic Properties ◽  
Adhesion Force ◽  
Human Head ◽  
Adhesion Forces ◽  
Functional Surface ◽  
Liquid Meniscus ◽  
Capillary Adhesion ◽  
Small Structure ◽  
Spring Constants

We report a novel, practical technique for the concerted, simultaneous determination of both the adhesion force of a small structure or structural unit (e.g., an individual filament, hair, micromechanical component or microsensor) to a liquid and its elastic properties. The method involves the creation and development of a liquid meniscus upon touching a liquid surface with the structure, and the subsequent disruption of this liquid meniscus upon removal. The evaluation of the meniscus shape immediately before snap-off of the meniscus allows the quantitative determination of the liquid adhesion force. Concurrently, by measuring and evaluating the deformation of the structure under investigation, its elastic properties can be determined. The sensitivity of the method is remarkably high, practically limited by the resolution of the camera capturing the process. Adhesion forces down to 10 µN and spring constants up to 2 N/m were measured. Three exemplary applications of this method are demonstrated: (1) determination of the water adhesion force and the elasticity of individual hairs (trichomes) of the floating fern Salvinia molesta. (2) The investigation of human head hairs both with and without functional surface coatings (a topic of high relevance in the field of hair cosmetics) was performed. The method also resulted in the measurement of an elastic modulus (Young’s modulus) for individual hairs of 3.0 × 105 N/cm2, which is within the typical range known for human hair. (3) Finally, the accuracy and validity of the capillary adhesion technique was proven by examining calibrated atomic force microscopy cantilevers, reproducing the spring constants calibrated using other methods.

scholarly journals The capillary adhesion technique: a versatile method for determining the liquid adhesion force and sample stiffness

nano Online ◽  
2016 ◽  
Author(s):  
Daniel Gandyra ◽  
Stefan Walheim ◽  
Stanislav Gorb ◽  
Wilhelm Barthlott ◽  
Thomas Schimmel
Keyword(s):  
Adhesion Force ◽  
Capillary Adhesion

Buckling Behavior of Tire Breaker Structure

1983 ◽  
Vol 11 (1) ◽  
pp. 3-19
Author(s):  
T. Akasaka ◽  
S. Yamazaki ◽  
K. Asano
Keyword(s):  
Elastic Foundation ◽  
Elastic Moduli ◽  
Wave Length ◽  
Bending Moment ◽  
Experimental Results ◽  
Automobile Tire ◽  
Buckling Behavior ◽  
Post Buckling ◽  
Steel Cord ◽  
Interlaminar Shear

Abstract The buckled wave length and the critical in-plane bending moment of laminated long composite strips of cord-reinforced rubber sheets on an elastic foundation is analyzed by Galerkin's method, with consideration of interlaminar shear deformation. An approximate formula for the wave length is given in terms of cord angle, elastic moduli of the constituent rubber and steel cord, and several structural dimensions. The calculated wave length for a 165SR13 automobile tire with steel breakers (belts) was very close to experimental results. An additional study was then conducted on the post-buckling behavior of a laminated biased composite beam on an elastic foundation. This beam is subjected to axial compression. The calculated relationship between the buckled wave rise and the compressive membrane force also agreed well with experimental results.

Real-time manipulation fluid-solid interfacial friction and adhesion force by electrowetting on dielectric

2021 ◽  
pp. 106985
Author(s):  
Cheng Tang ◽  
Yafeng Zhang ◽  
Conghui Dong ◽  
Jiaxin Yu ◽  
Jianping Lai ◽  
...  
Keyword(s):  
Real Time ◽  
Adhesion Force ◽  
Interfacial Friction ◽  
Electrowetting On Dielectric ◽  
Time Manipulation

Design of a wheeled wall climbing robot based on the performance of bio-inspired dry adhesive material

Robotica ◽  
2021 ◽  
pp. 1-14
Author(s):  
Hongkai Li ◽  
Xianfei Sun ◽  
Zishuo Chen ◽  
Lei Zhang ◽  
Hongchao Wang ◽  
...  
Keyword(s):  
Flat Surface ◽  
Thrust Force ◽  
Adhesion Force ◽  
Structure Design ◽  
Design Parameters ◽  
Climbing Robot ◽  
Adhesive Material ◽  
Ducted Fan ◽  
The Stability ◽  
Belt System

Abstract Inspired by gecko’s adhesive feet, a wheeled wall climbing robot is designed in this paper with the synchronized gears and belt system acting as the wheels by considering both motion efficiency and adhesive capability. Adhesion of wheels is obtained by the bio-inspired adhesive material wrapping on the outer surface of wheels. A ducted fan mounted on the back of the robot supplies thrust force for the adhesive material to generate normal and shear adhesion force whilemoving on vertical surfaces. Experimental verification of robot climbing on vertical flat surface was carried out. The stability and the effect of structure design parameters were analyzed.

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