Article
Physics, Multidisciplinary
Arindam Phani, Ho Sang Jung, Seonghwan Kim
Summary: Phase-contrast in tapping-mode atomic force microscopy has traditionally been interpreted using homogeneous distributions that ignore fluctuations, but recent research challenges this assumption by revealing heterogeneous contributions induced by the tip. At smaller tapping amplitudes, transitional heterogeneous losses emerge as the dominant mechanism outweighing homogeneous losses, providing a more accurate characterization of soft materials. This understanding of loss pathways can offer insights into the bio-physical origins of heterogeneities in soft-bio-matter.
COMMUNICATIONS PHYSICS
(2021)
Article
Chemistry, Analytical
Denys V. Benedis, Alexandre Dazzi, Mickael Rivallan, Gerhard D. Pirngruber
Summary: This study proposes to evaluate and validate the emerging spectroscopic space-resolved technique of atomic force microscopy coupled with infrared spectroscopy (AFM-IR). It is found that AFM-IR spectra of homogeneous polymers can be compared with conventional Fourier-transform infrared (FTIR) spectra obtained in transmission. However, for inorganic solids, the AFM-IR spectra are different from the global FTIR spectra, indicating that the AFM-IR technique probes a volume that is not representative of the global composition and there is surface heterogeneity.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Devon S. Jakob, Nengxu Li, Huanping Zhou, Xiaoji G. Xu
Summary: This article introduces a novel method to generate Coulombic force in KPFM, increasing the spatial resolution to approximately 25 nm. By integrating PiFM, high spatial resolution chemical distributions and surface potential maps can be obtained concurrently. This is expected to facilitate characterizations of nanoscale electrical properties of photoactive materials, semiconductors, and ferroelectric materials.
Article
Engineering, Electrical & Electronic
Nata F. S. de Bem, Michael G. Ruppert, Andrew J. Fleming, Yuen K. Yong
Summary: The article introduces an atomic force microscope cantilever with on-chip actuation and dual-sensing capabilities. A mathematical model is developed and validated, and a physical prototype is presented for calibration and validation. Experimental results demonstrate consistency with external measurements.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Mechanics
Mauricio A. Ribeiro, Galina A. Kurina, Angelo M. Tusset, Jose M. Balthazar
Summary: This study investigates the nonlinear behavior of an atomic force microscopy system with the contribution of the medium viscoelasticity term. By proposing a mathematical model and using various numerical analysis methods, it is found that higher approximations of averaging method are very effective for studying the dynamics of an atomic force microscopy.
ARCHIVE OF APPLIED MECHANICS
(2022)
Article
Chemistry, Physical
Amir Farokh Payam, Alessio Morelli, Patrick Lemoine
Summary: A novel multiparametric approach is proposed in this paper for simultaneously quantifying the Hamaker constant and viscoelastic properties of materials, surpassing current equations used in the AFM community. The accuracy of the method is validated through multiple simulations and experiments, showing its superiority in material properties quantification compared to traditional AFM methods.
APPLIED SURFACE SCIENCE
(2021)
Article
Physics, Applied
Abhilash Chandrashekar, Pierpaolo Belardinelli, Stefano Lenci, Urs Staufer, Farbod Alijani
Summary: This study successfully increased the sensitivity of higher harmonics of an atomic force microscope cantilever through dynamic mode coupling, achieving tuning of harmonic frequencies while reducing sample indentation. The results of the study indicate that nonlinear mode coupling is one of the reasons for the increase in the amplitude of higher harmonics.
PHYSICAL REVIEW APPLIED
(2021)
Article
Physics, Multidisciplinary
Mauricio A. Ribeiro, Angelo M. Tusset, Wagner B. Lenz, Ilham Kirrou, Jose M. Balthazar
Summary: The study investigated the nonlinear dynamic model of the Atomic Force Microscopy model with the influence of a viscoelastic term, showing the impact of this term on the system dynamics. A generalized model with fractional calculus was also analyzed, leading to the identification of chaotic and periodic regions in the system. Classic tools of nonlinear dynamics were used, revealing the complexity of the fractional dynamics in the AFM system.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2021)
Article
Chemistry, Analytical
Alex Mirabal, Scott Calabrese Barton
Summary: Research demonstrates that atomic force microscopy-based SECM technology can measure concentration profiles around active surfaces, but the presence of the tip can distort these profiles, affecting the chemical behavior at the catalytic surface. By inversely fitting data, kinetic and geometric parameters characterizing the tip effect can be derived, and the tip effects can be removed in the model.
ANALYTICAL CHEMISTRY
(2021)
Article
Green & Sustainable Science & Technology
Sonali Bhaduri, Sudhanshu Mallick, Narendra Shiradkar, Anil Kottantharayil
Summary: Anti-soiling coatings are effective in reducing dust deposition on PV modules. This study used TM-AFM phase imaging to characterize the surface changes of four different anti-soiling coatings under various environmental stressors, demonstrating its potential as a promising approach for evaluating the performance of these coatings.
JOURNAL OF RENEWABLE AND SUSTAINABLE ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Shuji Fujisawa, Kazuho Daicho, Ayhan Yurtsever, Takeshi Fukuma, Tsuguyuki Saito
Summary: All-atom molecular dynamics simulations and atomic force microscopy were used to study the structural dynamics of single nanocellulose during drying. It was discovered that the twist morphology of nanocellulose becomes localized along the fibril axis in the final stage of drying. Conformational changes at C6 hydroxymethyl groups and glycoside bond were also observed, indicating an increase in crystallinity during the drying process. These insights provide valuable information for understanding the nanocellulose structures in material processing and designing materials with advanced functionalities.
Article
Chemistry, Physical
Denis Scaini, Fabio Biscarini, Loredana Casalis, Cristiano Albonetti
Summary: Adjacent patches of alkanethiol molecules with chain lengths ranging from 11 to 15 carbon atoms were fabricated using nanografting within a Self-Assembled Monolayer matrix. The structural and electronic properties of these molecules were investigated using Atomic Force Microscopy and Electrostatic Force Microscopy, highlighting the significant influence of substrate roughness. The results revealed an odd-even dependence of local stiffness on alkyl chain length based on topographic phase signal, and an asymmetric parabolic trend of conformational order versus the alkyl chain length induced by substrate roughness based on electrostatic force signal.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Engineering, Manufacturing
L. Angeloni, M. Ganjian, M. Nouri-Goushki, M. J. Mirzaali, C. W. Hagen, A. A. Zadpoor, L. E. Fratila-Apachitei, M. K. Ghatkesar
Summary: This study introduces two atomic force microscopy methods for determining the mechanical characteristics of individual micro- and nanopillars without the use of SEM. Case studies on nanopillars fabricated using additive manufacturing methods showed consistent results, confirming the efficacy of the proposed methods.
ADDITIVE MANUFACTURING
(2021)
Article
Multidisciplinary Sciences
Rita dos Santos Natividade, Melanie Koehler, Priscila S. F. C. Gomes, Joshua D. Simpson, Sydni Caet Smith, Diego E. B. Gomes, Juliette de Lhoneux, Jinsung Yang, Ankita Ray, Terence S. Dermody, Rafael C. Bernardi, Kristen M. Ogden, David Alsteens
Summary: This study investigates the nanomechanical properties of viral attachment proteins and their impact on virus-binding capacity and infectivity. The research reveals that conformational changes in the viral protein a1 significantly increase its affinity for JAM-A, leading to enhanced infectivity. The study also demonstrates how GM2 enhances the a1-JAM-A interaction. These findings provide important insights for the development of antiviral drugs and improved oncolytic vectors.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Nanoscience & Nanotechnology
Keivan Asadi, Junghoon Yeom, Hanna Cho
Summary: Investigating internal resonance (IR) mechanisms in micro/nanoresonators reveals that intermodal coupling between second and third flexural modes in asymmetric structures provides an optimal condition for strong IR, with high energy transfer to the resonated mode. This study introduces design strategies that can be easily integrated into typical micro/nanoelectromechanical systems, offering potential for paradigm-shifting applications in micro/nanosystems.
MICROSYSTEMS & NANOENGINEERING
(2021)
Article
Engineering, Mechanical
Itamar Iliuk, Jose M. Balthazar, Angelo M. Tusset, Reyolando M. L. R. F. Brasil, Jose R. C. Piqueira
Summary: This note analyzes the influence of fractional-order derivative damping on the vibrations of a non-linear piezoelectric energy harvesting device connected to a portal frame. The behavior of the portal frame is identified using various dynamic responses, and the numerical analysis shows that the fractional-order damping sustains chaotic behaviors of the system.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Article
Mechanics
Eduardo Abuhamad Petrocino, Jose Manoel Balthazar, Angelo Marcelo Tusset, Paulo Jose Paupitz Goncalves, Marcos Silveira
Summary: This research aims to analyze an electromagnetic absorber in a non-ideal system, a simple model for the analysis of the first mode of a beam. The dynamic behavior of a cantilever beam with a dc motor coupled to its free end, having an unbalanced mass on its axis, providing a non-ideal energy source, is investigated. An analysis of the dynamic behavior is carried out by means of an analytical solution approximated by the averaging method and by numerical computational simulations. The absorber reduces the phenomena caused by the Sommerfeld effect and reduces the region of instability.
Article
Robotics
Angelo M. Tusset, Amarildo E. B. Pereira, Jose M. Balthazar, Frederic C. Janzen, Clivaldo Oliveira, Maria E. K. Fuziki, Giane G. Lenzi
Summary: This study proposes a hybrid controller that combines concepts of a PID controller with LQR and a feedforward gain to control the positioning of a 2 DOF robotic arm with flexible joints subject to non-ideal excitations. Two cases were studied to evaluate the performance of the controls, with one case involving fixed positioning of the arm and the other case involving rotational movement of the arm. The results of simulations showed that the hybrid controller provides the lowest error for both cases, but is sensitive to variations in the mass of the arm in rotational movements, highlighting the importance of optimal control design.
Article
Mechanics
Mauricio Ribeiro, Hilson Daum, Angelo Tusset, Jose Balthazar, Rodrigo Silva, Raphaela Machado, Grzegorz Litak
Summary: This work explores the nonlinear dynamics of capturing energy from a device by using a cantilever beam with ferromagnetic material and piezoceramic patches connected to an electrical circuit. The influence of asymmetric potential can change the potential well distribution and adjust the dynamic characteristics of the device, benefiting the use of energy under different excitation conditions.
ARCHIVE OF APPLIED MECHANICS
(2023)
Article
Chemistry, Physical
Maria E. K. Fuziki, Laura S. Ribas, Eduardo Abreu, Luciano Fernandes, Onelia A. A. dos Santos, Rodrigo Brackmann, Jose L. D. de Tuesta, Angelo M. Tusset, Giane G. Lenzi
Summary: TiO2-Nb2O5 catalysts doped with N show enhanced photocatalytic and antioxidant activity. The photocatalytic and antioxidant activities vary with different pH and %Nb conditions.
Article
Engineering, Mechanical
Angelo M. Tusset, Maria E. K. Fuziki, Giane G. Lenzi, Guilherme P. dos Santos, Jose M. Balthazar, Reyolando M. L. R. F. Brasil
Summary: This paper numerically investigates the horizontal response of a vertical transportation model (elevator) with 4 degrees of freedom, excited by deformations in the rail guide. It introduces a Non-linear Energy Sink (NES) as a vibration absorber and power generation source. The numerical analysis evaluates the vibration levels and comfort in the elevator cabin, the efficiency of using a non-linear dynamic vibration absorber, and its potential for energy generation.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Article
Engineering, Chemical
Luis Fernando Cusioli, Daniel Mantovani, Rosangela Bergamasco, Angelo Marcelo Tusset, Giane Goncalves Lenzi
Summary: In this study, an adsorbent was developed from agro-industrial waste, specifically the seed husks of Moringa oleifera Lam., using the hydrochar process. The adsorbent was compared with a commercial activated charcoal from babacu coconut. Characterization of both materials showed their adsorption capacity, and cost analysis revealed the low production cost. The new adsorbent showed an average removal rate of 84.56-99.13% for various contaminants, indicating its potential for large-scale application.
Article
Engineering, Mechanical
Angelo M. Tusset, Dim B. Pires, Jose M. Balthazar, Maria E. K. Fuziki, Dana I. Andrade, Giane G. Lenzi
Summary: This paper investigates the application of piezoelectric materials in energy generation through numerical simulations. The mathematical model describes a U-shaped portal frame system, excited by an engine with unbalanced mass and coupled to a nonlinear energy sink (NES) as a passive vibration absorber. The influence of piezoelectric material parameters and NES system dimensioning parameters on energy collection is deeply analyzed. Numerical simulations consider all combinations of the parameters of the piezoelectric material model and the NES, and system dynamics are analyzed through phase diagrams and the 0-1 test. The estimation of energy collection is carried out by calculating the average power. The numerical results show that certain combinations of parameters can achieve more significant potential for energy generation, as well as chaotic behavior in some cases.
Article
Chemistry, Inorganic & Nuclear
Jessica R. P. Oliveira, Laura S. Ribas, Jose S. Napoli, Eduardo Abreu, Jose L. Diaz de Tuesta, Helder T. Gomes, Angelo M. Tusset, Giane G. Lenzi
Summary: This study synthesized an innovative nanomaterial (patent application number BR 1020210000317) called cobalt ferrite functionalized in niobium pentoxide (CoFe2O4@Nb5O2 or CFNb) using tangerine peel extract via green synthesis. CFNb, which combines magnetic and abundant niobium pentoxide properties, was used as a catalyst for paracetamol degradation by photocatalysis. The study characterized the new material and investigated the effects of pH and catalyst concentration on CFNb's efficiency in the degradation process, with the findings showing optimal results at low pH and low catalyst concentration under specific irradiation conditions.
Article
Mathematics, Interdisciplinary Applications
Angelo M. Tusset, Maria E. K. Fuziki, Jose M. Balthazar, Dana I. Andrade, Giane G. Lenzi
Summary: This paper investigates the dynamics of an economic system with chaotic behavior and proposes a suboptimal control proposal to suppress the chaotic behavior. Numerical results using phase portraits, bifurcation diagrams, Lyapunov exponents, and 0-1 testing confirm chaotic and hyperchaotic behavior. The results also demonstrate the effectiveness of the control, showing errors below 1% even with parametric errors. Additionally, the study explores the system in fractional order, revealing periodic, constant, or chaotic behavior for specific values of the derivative order.
FRACTAL AND FRACTIONAL
(2023)
Article
Mathematics, Applied
Michelle F. Westin, Jose M. Balthazar, Roberto G. A. da Silva, Mauricio A. Ribeiro, Angelo M. Tusset
Summary: The objective of this article is to investigate the dynamical behavior of an aeroelastic system at the flutter velocity by comparing computational and experimental results. Traditional methods such as attractor reconstruction, Lyapunov exponent calculation, and the 0-1 test are used to understand the nonlinear behavior of the system. The study concludes that the system exhibits chaotic behavior when no dynamic stall correction or Gangwani's correction is applied, but the chaotic behavior is postponed when Boeing-Vertol's correction is applied.
