scholarly journals Probing of Nanoscale Friction and Mechanical Characteristics of Cotton Fiber’s Surface

Fibers ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 64
Author(s):  
Hosseinali ◽  
Thomasson
Keyword(s):  
Surface Topography ◽  
Mechanical Characteristics ◽  
Normal Force ◽  
Adhesion Force ◽  
Transition Phase ◽  
Contact Mode ◽  
Frictional Properties ◽  
Normal Forces ◽  
Atomic Force ◽  
Two Samples

The surface topography and nanomechanical attributes of two samples of cotton fibers, namely, A and B, were characterized with various operation modes of an Atomic Force Microscope (AFM). The surface topography and friction images of the fibers were obtained in contact mode. The nanomechanical properties images—i.e., adhesion and deformation—were obtained in force tapping mode. The results indicate that the surface nanomechanical and nanoscale frictional properties of the fibers vary significantly between two samples. The plots of friction versus normal force of the fibers’ surface from both samples are fitted to the equation of single-asperity, adhesion-controlled friction. Nevertheless, within the range of the applied normal force, the friction curves of sample A surfaces show a characteristic transition phase. That is, under low normal forces, the friction curves closely conform with the Hertzian component of friction; after the transition takes place at higher normal forces, the friction curves follow Amontons’ law of friction. We demonstrated that the transition phase corresponds to a state at which the cuticle layer molecules are displaced from the fibers’ surface. The average adhesion force of the samples is consistent with the average friction signal strength collected under low normal forces.

Investigation of Friction Over a Wide Range of Normal Forces

2007 ◽  
Author(s):  
Dirk Drees ◽  
Satish Achanta
Keyword(s):  
Surface Roughness ◽  
Dual Phase Steel ◽  
Normal Force ◽  
Diamond Like Carbon ◽  
Dual Phase ◽  
Normal Forces ◽  
Atomic Force ◽  
Wide Range ◽  
Atomic Interactions ◽  
The Coefficient Of Friction

Friction at different force, length, and time scales is of great interest in tribology. The mechanical, chemical, and physical (atomic) interactions, each operating at their own time length and force scale, makes friction complex. This work is an attempt to improve the understanding of friction at normal forces ranging from nN up to N. This investigation was carried out under reciprocating ball-on-flat sliding conditions on engineering surfaces like diamond-like carbon (DLC) and dual phase steel. The test equipments used for this investigation are an atomic force microscope, a microtribometer, and a macrofretting tester. It was observed that for a hard/hard tribocouple like DLC/Si3N4, the variation in the coefficient of friction is negligible whereas the variation is large when the tribocouple is hard / soft like in dual phase steel / Si3N4. By changing the surface roughness of the material, the dependence of friction on normal force could be altered or manipulated.

Frictional Properties of Antimony Nanoparticles: The Influence of Contact Area, Structure, and Surface Contamination

2007 ◽  
Author(s):  
Udo D. Schwarz ◽  
Claudia Ritter ◽  
Bert Stegemann ◽  
Markus Heyde ◽  
Klaus Rademann ◽  
...  
Keyword(s):  
Contact Area ◽  
Frictional Resistance ◽  
Ambient Conditions ◽  
Contact Mode ◽  
Frictional Properties ◽  
Atomic Force ◽  
Crystalline Core ◽  
Experimental Approaches ◽  
Frictional Behaviour ◽  
Distinct Increase

We performed experiments where the frictional resistance of antimony nanoparticles with varying contact areas is measured in ambient conditions as well as in ultrahigh vacuum while they are pushed by the tip of an atomic force microscope (AFM). Two different procedures have been used in independent studies to investigate the frictional properties of these particles during dislocation using the AFM operated in the contact mode or dynamic (tapping) mode, respectively. Both experimental approaches revealed a linear dependence of the frictional properties on contact area. Moreover, both methods detect a sudden and distinct increase in frictional resistance at around 15000 nm2 particle size, which coincides with a structural transition of the particles from an amorphous to a crystalline core state and confirms our earlier data showing the same result. Possible reasons for this effect are discussed in terms of both the atomic structure of the antimony particles as well as the interface structure. Some of the observed frictional behaviour of the particles may be explained considering the influence of sample contamination.

The Effect of Tip Materials on the Nanotribology with Atomic Force Microscope Technique

2015 ◽  
Vol 723 ◽  
pp. 763-768
Author(s):  
Mei Dong ◽  
Mei Li ◽  
Yan Zhang
Keyword(s):  
Silicon Nitride ◽  
Friction Coefficient ◽  
Silicon Substrate ◽  
Normal Force ◽  
Real Contact Area ◽  
Wafer Surface ◽  
Contact Mode ◽  
Atomic Force ◽  
Microscope Technique ◽  
The Relationship

The effect of tip materials on the friction properties of silicon substrate was investigated by using atomic force microcopy (AFM). The roughness of the silicon wafer surface was characterized with silicon tip at tapping mode, and then the relationship between the friction force and normal force was obtained by silicon tip and silicon nitride tip at contact mode. The experimental results show that when the load exceeds a critical value, the friction coefficient with silicon tip increases from 0.17 to 0.37, which is due to the wear of the silicon tip; the friction coefficient with a hard silicon nitride tip increases from 0.25 to 0.5, which can only be attributed to the plastic deformation of silicon substrate. And the roughness of the silicon substrate can lead to an incomplete contact, which can influence the real contact area between the silicon nitride tip and silicon substrate.

Mechanical Response of Diamond at Nanometer Scaes: Diamond Polishing and Atomic Force Microscopy

2000 ◽  
Vol 649 ◽  
Author(s):  
Ruben Pérez ◽  
Murray R. Jarvis ◽  
Michael C. Payne
Keyword(s):  
Chemical Nature ◽  
Mechanical Response ◽  
Normal Force ◽  
Single Atom ◽  
Mechanical Interaction ◽  
Contact Mode ◽  
Diamond Surfaces ◽  
Force Microscopy ◽  
Atomic Force ◽  
Diamond Polishing

ABSTRACTTotal energy pseudopotential methods are used to study two different processes involving the mechanical interaction of diamond nanoasperities and diamond surfaces: the wear processes reponsible for diamond polishing, an the mechanical deformation of tip and surface during the operation of the Atomic Force Microscope in contact Mode (CM-AFM). The strong asymmetry in the rate of polishing between different dirctions onthe diamond (110) surface is explained in terms of on atomistic mechanism for nano-groove formation. The pst–polishing surface morphology and the nature of the polishing residue epredicted by this mechanism are consistent with experimental evidence. In the case of CM-FAM, our calculations show that a tip terminated in a single atom is able to sustain forces in excess of 30 nN. The magnitude of the normal force was unexpectedlyfound to be verye similar for th approach on top of an atom or on a hollow position on the surface. This behaviour is due to tip relaxations induced by the interaction with the surface. These forces are also rather insensitive to the chemical nature of the tip apex.

Study of PDMS Compounds Using the Adhesion Force Determined by AFM Force Distance Curve Measurements

2010 ◽  
Vol 93-94 ◽  
pp. 141-144 ◽  
Author(s):  
S. Vanitparinyakul ◽  
P. Pattamang ◽  
A. Chanhom ◽  
B. Tunhoo ◽  
T. Thiwawong ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Adhesion Force ◽  
Surface Force ◽  
Model Systems ◽  
Force Measurements ◽  
Distance Curve ◽  
Contact Mode ◽  
Force Microscopy ◽  
The Third ◽  
Atomic Force

The atomic force microscope(AFM) was used to perform surface force measurements in contact mode to investigate surface properties of model systems at the nanoscale. Three different Polydimethylsiloxane (PDMS) compounds were observed. The first consisted of pure PDMS, the second of PDMS blend with the nanoparticles Zinc Oxide(PDMS/ZnO) and the third of PDMS blend with the nanoparticles Zinc Oxide and toluene solvent(PDMS/ZnO/toluene), respectively. Surface morphology and the adhesion force were investigated by using atomic force microscopy. Force–distance curve measurement was performed in a contact mode, which used tip as silicon nitride. Moreover, we found a significantly different of the adhesion force when modified by nanoparticles ZnO and toluene solvent.

scholarly journals Исследование механических характеристик нативных фибробластов с помощью атомно-силового микроскопа

2019 ◽  
Vol 45 (18) ◽  
pp. 44
Author(s):  
К.И. Тимощук ◽  
М.М. Халисов ◽  
В.А. Пеннияйнен ◽  
Б.В. Крылов ◽  
А.В. Анкудинов
Keyword(s):  
Atomic Force Microscopy ◽  
Mechanical Characteristics ◽  
Normal Force ◽  
Atomic Force Microscopy Data ◽  
Force Microscopy ◽  
Atomic Force ◽  
Lateral Forces ◽  
Microscopy Data

It was found that living fibroblasts become more rigid after exposure to colchicine. For reliable measurements, we identified the cells, that during indentation interact with weak lateral forces that do not distort the normal force contribution. The atomic force microscopy data of the mechanical characteristics of such cells are interpreted unambiguously.

Surface roughness measurements of vanadium-contaminated fluidized cracking catalysts by atomic force microscopy

1996 ◽  
Vol 54 ◽  
pp. 866-867
Author(s):  
H. Kinney ◽  
M.L. Occelli ◽  
S.A.C. Gould
Keyword(s):  
Surface Roughness ◽  
Zeolite Y ◽  
Atomic Level ◽  
Microporous Structure ◽  
Contact Mode ◽  
Force Microscopy ◽  
Atomic Force ◽  
Before And After ◽  
Roughness Measurements ◽  
Cracking Catalysts

For this study we have used a contact mode atomic force microscope (AFM) to study to topography of fluidized cracking catalysts (FCC), before and after contamination with 5% vanadium. We selected the AFM because of its ability to well characterize the surface roughness of materials down to the atomic level. It is believed that the cracking in the FCCs occurs mainly on the catalysts top 10-15 μm suggesting that the surface corrugation could play a key role in the FCCs microactivity properties. To test this hypothesis, we chose vanadium as a contaminate because this metal is capable of irreversibly destroying the FCC crystallinity as well as it microporous structure. In addition, we wanted to examine the extent to which steaming affects the vanadium contaminated FCC. Using the AFM, we measured the surface roughness of FCCs, before and after contamination and after steaming.We obtained our FCC (GRZ-1) from Davison. The FCC is generated so that it contains and estimated 35% rare earth exchaged zeolite Y, 50% kaolin and 15% binder.

scholarly journals Dynamic friction energy dissipation and enhanced contrast in high frequency bimodal atomic force microscopy

Friction ◽  
2021 ◽  
Author(s):  
Xinfeng Tan ◽  
Dan Guo ◽  
Jianbin Luo
Keyword(s):  
Atomic Force Microscopy ◽  
Energy Dissipation ◽  
Contact Friction ◽  
Measuring Instruments ◽  
Dynamic Friction ◽  
Contact Mode ◽  
Force Microscopy ◽  
Atomic Force ◽  
Friction Energy ◽  
New Applications

AbstractDynamic friction occurs not only between two contact objects sliding against each other, but also between two relative sliding surfaces several nanometres apart. Many emerging micro- and nano-mechanical systems that promise new applications in sensors or information technology may suffer or benefit from noncontact friction. Herein we demonstrate the distance-dependent friction energy dissipation between the tip and the heterogeneous polymers by the bimodal atomic force microscopy (AFM) method driving the second order flexural and the first order torsional vibration simultaneously. The pull-in problem caused by the attractive force is avoided, and the friction dissipation can be imaged near the surface. The friction dissipation coefficient concept is proposed and three different contact states are determined from phase and energy dissipation curves. Image contrast is enhanced in the intermediate setpoint region. The work offers an effective method for directly detecting the friction dissipation and high resolution images, which overcomes the disadvantages of existing methods such as contact mode AFM or other contact friction and wear measuring instruments.

scholarly journals Redesigned Sensor Holder for an Atomic Force Microscope with an Adjustable Probe Direction

2021 ◽  
Author(s):  
Janik Schaude ◽  
Maxim Fimushkin ◽  
Tino Hausotte
Keyword(s):  
Atomic Force Microscope ◽  
Piezoelectric Actuator ◽  
High Speed ◽  
Closed Loop ◽  
Coefficient Of Thermal Expansion ◽  
Measuring System ◽  
Contact Mode ◽  
Loop Control ◽  
Atomic Force ◽  
Measuring Machine

AbstractThe article presents a redesigned sensor holder for an atomic force microscope (AFM) with an adjustable probe direction, which is integrated into a nano measuring machine (NMM-1). The AFM, consisting of a commercial piezoresistive cantilever operated in closed-loop intermitted contact-mode, is based on two rotational axes, which enable the adjustment of the probe direction to cover a complete hemisphere. The axes greatly enlarge the metrology frame of the measuring system by materials with a comparatively high coefficient of thermal expansion. The AFM is therefore operated within a thermostating housing with a long-term temperature stability of 17 mK. The sensor holder, connecting the rotational axes and the cantilever, inserted one adhesive bond, a soldered connection and a geometrically undefined clamping into the metrology circle, which might also be a source of measurement error. It has therefore been redesigned to a clamped senor holder, which is presented, evaluated and compared to the previous glued sensor holder within this paper. As will be shown, there are no significant differences between the two sensor holders. This leads to the conclusion, that the three aforementioned connections do not deteriorate the measurement precision, significantly. As only a minor portion of the positioning range of the piezoelectric actuator is needed to stimulate the cantilever near its resonance frequency, a high-speed closed-loop control that keeps the cantilever within its operating range using this piezoelectric actuator further on as actuator was implemented and is presented within this article.

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