scholarly journals Material discrimination and mixture ratio estimation in nanocomposites via harmonic atomic force microscopy

2017 ◽  
Vol 8 ◽  
pp. 2771-2780 ◽  
Author(s):  
Weijie Zhang ◽  
Yuhang Chen ◽  
Xicheng Xia ◽  
Jiaru Chu
Keyword(s):  
Atomic Force Microscopy ◽  
Harmonic Signal ◽  
Laser Spot ◽  
Harmonic Amplitude ◽  
Mixture Ratio ◽  
Force Microscopy ◽  
Drive Frequency ◽  
Atomic Force ◽  
Potential Applications ◽  
Feedback Set

Harmonic atomic force microscopy (AFM) was employed to discriminate between different materials and to estimate the mixture ratio of the constituent components in nanocomposites. The major influencing factors, namely amplitude feedback set-point, drive frequency and laser spot position along the cantilever beam, were systematically investigated. Employing different set-points induces alternation of tip–sample interaction forces and thus different harmonic responses. The numerical simulations of the cantilever dynamics were well-correlated with the experimental observations. Owing to the deviation of the drive frequency from the fundamental resonance, harmonic amplitude contrast reversal may occur. It was also found that the laser spot position affects the harmonic signal strengths as expected. Based on these investigations, harmonic AFM was employed to identify material components and estimate the mixture ratio in multicomponent materials. The composite samples are composed of different kinds of nanoparticles with almost the same shape and size. Higher harmonic imaging offers better information on the distribution and mixture of different nanoparticles as compared to other techniques, including topography and conventional tapping phase. Therefore, harmonic AFM has potential applications in various fields of nanoscience and nanotechnology.

scholarly journals The Infuence of Salicin on Rheological and Film-Forming Properties of Collagen

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1661
Author(s):  
Katarzyna Adamiak ◽  
Katarzyna Lewandowska ◽  
Alina Sionkowska
Keyword(s):  
Mechanical Properties ◽  
Atomic Force Microscopy ◽  
Infrared Spectroscopy ◽  
Rheological Properties ◽  
Silver Carp ◽  
Shear Tests ◽  
Force Microscopy ◽  
Atomic Force ◽  
Film Forming ◽  
Potential Applications

Collagen films are widely used as adhesives in medicine and cosmetology. However, its properties require modification. In this work, the influence of salicin on the properties of collagen solution and films was studied. Collagen was extracted from silver carp skin. The rheological properties of collagen solutions with and without salicin were characterized by steady shear tests. Thin collagen films were prepared by solvent evaporation. The structure of films was researched using infrared spectroscopy. The surface properties of films were investigated using Atomic Force Microscopy (AFM). Mechanical properties were measured as well. It was found that the addition of salicin modified the roughness of collagen films and their mechanical and rheological properties. The above-mentioned parameters are very important in potential applications of collagen films containing salicin.

scholarly journals Applications of Atomic Force Microscopy in Textiles

2015 ◽  
Vol 10 (1) ◽  
pp. 155892501501000
Author(s):  
Serpil Koral Koc
Keyword(s):  
Atomic Force Microscopy ◽  
Cross Section ◽  
Cross Sections ◽  
Phase Imaging ◽  
Cotton Wool ◽  
Synthetic Fibers ◽  
Force Microscopy ◽  
Fiber Properties ◽  
Atomic Force ◽  
Potential Applications

Potential applications of atomic force microscopy (AFM) in textiles are explained. For this purpose samples were carefully selected from both natural and synthetic fibers. Cotton, wool, conventional polyethylene terepthalate (PET), antibacterial PET, and antistatic PET were investigated by means of 3D topography imaging, phase imaging, and calculation of their Rq values. The distribution of the additives in the cross sections of antibacterial PET and antistatic PET were analyzed. Moreover, differences between inner and outer cross section of trilobal PET was observed by force spectroscopy. The results are discussed considering the fiber properties. It is concluded that AFM is a powerful tool to investigate different properties of textile fibers, and it gives valuable information.

scholarly journals Tapping Mode Atomic Force Microscopy (TMAFM) of Some Multi-Component Polymers

2013 ◽  
Vol 29 ◽  
pp. 96-103
Author(s):  
Rameshwar Adhikari
Keyword(s):  
Atomic Force Microscopy ◽  
Block Copolymers ◽  
Chemical Society ◽  
Phase Imaging ◽  
Force Microscopy ◽  
Molecular Arrangement ◽  
Atomic Force ◽  
Unit Cells ◽  
Potential Applications ◽  
Nanoscale Morphology

Atomic force microscopy (AFM) has been used frequently in polymer research in particular for imaging topography and phase morphology of multi-component polymers. In this work, we demonstrate the potential applications of the AFM in the study of morphology of multi-component polymers taking examples of some technically important semicrystalline polymers, blends and nanostructured block copolymers. The morphology of semicrystalline morphology could be determined ranging from molecular arrangement in the unit cells to the lamellar structure to the macroscopic morphology showing the spherulites of the polymers. Nanoscale morphology of block copolymers, nanocomposites and blends could be easily accessed by the aping mode AFM (TMAFM) phase imaging technique. It has been demonstrated that TMAFM phase imaging can be successfully utilized as a routine tool for the investigation of nanoscale morphology of the heterogeneous polymers.DOI: http://dx.doi.org/10.3126/jncs.v29i0.9258Journal of Nepal Chemical Society Vol. 29, 2012 Page:  96-103 Uploaded date: 12/5/2013 

Response Measurement Accuracy for Off-Resonance Excitation in Atomic Force Microscopy

2011 ◽  
Vol 134 (1) ◽  
Author(s):  
R. Parker Eason ◽  
Andrew J. Dick
Keyword(s):  
Atomic Force Microscopy ◽  
Measurement Accuracy ◽  
Excitation Frequency ◽  
Operating Conditions ◽  
Laser Spot ◽  
Resonance Excitation ◽  
Force Microscopy ◽  
Atomic Force ◽  
Mode Behavior ◽  
Tip Mass

Displacement measurement in atomic force microscopy (AFM) is most commonly obtained indirectly by measuring the slope of the AFM probe and applying a calibration factor. Static calibration techniques operate on the assumption that the probe response approximates single mode behavior. For off-resonance excitation or different operating conditions the contribution of higher modes may become significant. In this paper, changes to the calibrated slope-displacement relationship and the corresponding implications on measurement accuracy are investigated. A model is developed and numerical simulations are performed to examine the effect of laser spot position, tip mass, quality factor and excitation frequency on measurement accuracy. Free response conditions and operation under nonlinear tip-sample forces are considered. Results are verified experimentally using a representative macroscale system. A laser spot positioned at a nominal position between x = 0.5 and 0.6 is determined to minimize optical lever measurement error under conditions where the response is dominated by contributions from the first two modes, due to excitation as well as other factors.

Nanoscale Indentation of Polymer and Composite Particles by Atomic Force Microscopy

2006 ◽  
Vol 942 ◽  
Author(s):  
Silvia Armini ◽  
Ivan U. Vakarelski ◽  
Caroline M. Whelan ◽  
Karen Maex ◽  
Ko Higashitani
Keyword(s):  
Mechanical Properties ◽  
Atomic Force Microscopy ◽  
Chemical Mechanical Planarization ◽  
Silica Shell ◽  
Force Microscopy ◽  
Young’S Moduli ◽  
Atomic Force ◽  
Water Media ◽  
Potential Applications ◽  
Force Displacement

ABSTRACTAtomic Force Microscopy (AFM) was employed to probe the mechanical properties of surface-charged polymethylmethacrylate (PMMA)-based terpolymer and a composite terpolymer core-silica shell nanosphere in air and water media. Since these materials exhibit enhanced mechanical properties, such as toughness and elasticity, and enhanced chemical stability, they are particularly interesting for potential applications in reducing defectivity during the process of Chemical Mechanical Planarization. The polymer particles were subjected to a thermal treatment aimed at improving their mechanical properties in terms of hardness (H) and elastic modulus (E). By analysis of force-displacement curves and on the basis of Hertz's theory of contact mechanics, Young's moduli were measured for the terpolymer compared with the composite that has expected mechanical property enhancement due to its silica shell. In air, E increases from 4.3 GPa to 6.6 GPa for the treated terpolymer compared with the respective value of 10.3 GPa measured for the composite. In water, E increases from 1.6 GPa to 4.5 GPa for the thermally treated terpolymer that is comparable with the respective value of 3.6 GPa measured for the composite. This observation suggests that as an alternative to the creation of polymer-silica composite nanoparticles for CMP, comparable mechanical properties can be achieved by a simple heat treatment step.

Measuring the mechanical properties of flexible crystals using bi-modal atomic force microscopy

2019 ◽  
Vol 21 (36) ◽  
pp. 20219-20224 ◽  
Author(s):  
Madeleine F. Dupont ◽  
Aaron Elbourne ◽  
Edwin Mayes ◽  
Kay Latham
Keyword(s):  
Mechanical Properties ◽  
Atomic Force Microscopy ◽  
Force Microscopy ◽  
Atomic Force ◽  
Potential Applications

Flexible crystals are an emerging class of material with unique properties and a range of potential applications.

scholarly journals Lyapunov estimation for high-speed demodulation in multifrequency atomic force microscopy

2018 ◽  
Vol 9 ◽  
pp. 490-498 ◽  
Author(s):  
David M Harcombe ◽  
Michael G Ruppert ◽  
Michael R P Ragazzon ◽  
Andrew J Fleming
Keyword(s):  
Atomic Force Microscopy ◽  
High Speed ◽  
Harmonic Amplitude ◽  
Phase Imaging ◽  
Contrast Imaging ◽  
Force Microscopy ◽  
Atomic Force ◽  
Field Programmable ◽  
Frequency Components ◽  
Lock In

An important issue in the emerging field of multifrequency atomic force microscopy (MF-AFM) is the accurate and fast demodulation of the cantilever-tip deflection signal. As this signal consists of multiple frequency components and noise processes, a lock-in amplifier is typically employed for its narrowband response. However, this demodulator suffers inherent bandwidth limitations as high-frequency mixing products must be filtered out and several must be operated in parallel. Many MF-AFM methods require amplitude and phase demodulation at multiple frequencies of interest, enabling both z-axis feedback and phase contrast imaging to be achieved. This article proposes a model-based multifrequency Lyapunov filter implemented on a field-programmable gate array (FPGA) for high-speed MF-AFM demodulation. System descriptions and simulations are verified by experimental results demonstrating high tracking bandwidths, strong off-mode rejection and minor sensitivity to cross-coupling effects. Additionally, a five-frequency system operating at 3.5 MHz is implemented for higher harmonic amplitude and phase imaging up to 1 MHz.

scholarly journals Book review: Mahendra Rai, Anatoly Reshetilov, Yulia Plekhanova, Avinash P. Ingle, editors. Macro, Micro, and Nano-Biosensors: Potential Applications and Possible Limitation

2021 ◽  
Vol 21 (4) ◽  
pp. 216-218
Author(s):  
Ivan A. Kazarinov ◽  
Keyword(s):  
Atomic Force Microscopy ◽  
Main Idea ◽  
Electrical Energy ◽  
Biofuel Cells ◽  
Electrochemical Biosensors ◽  
Force Microscopy ◽  
Atomic Force ◽  
Potential Applications ◽  
Working Out

The main idea of the book is that, depending on the addressed problem, different approaches are to be used; macro constructs are to be worked with in some cases, micro and nano in others. Biosensors considered are electrochemical, optical, atomic force microscopy-based; biofuel cells that develop the idea of electrochemical biosensors are intended for a double purpose of cleaning up the environment and working out electrical energy.

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