Article
Chemistry, Physical
Yuyao Zhang, Xiaoying Zhu, Bokai Zhu, Chiheng Chu, Baoliang Chen
Summary: The hydrophobicity of nanomaterials plays a crucial role in various interfacial phenomena. However, it is challenging to study the high-resolution surface hydrophobicity at the nanoscale. In this study, a chemical force microscopy technique is used to profile in situ hydrophobicity images with nanoscale resolution, providing significant improvement compared to traditional methods. The method is applied to recognize the spatial fine structure hydrophobicity of different materials and reveals new findings regarding the hydrophobicity of graphene oxides (GO) and the influence of wrinkles/edges on hydrophobicity. Furthermore, the technique enables the observation of local oxidation variation during interfacial reactions.
Article
Chemistry, Physical
Irem Demir, Ines Luechtefeld, Claude Lemen, Etienne Dague, Pascal Guiraud, Tomaso Zambelli, Cecile Formosa-Dague
Summary: Studying the interactions between bubbles and bio-surfaces is a challenge, but a new method can be used to understand and engineer bubble-(bio)surfaces interactions.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Levente Juhasz, Roberto D. Ortuso, Kaori Sugihara
Summary: The study utilized quantitative friction force microscopy to measure the response of polydiacetylene to lateral forces, revealing the necessity of applying shear forces to characterize it at the nanoscale. The experiment confirmed the erroneous nature of the hypothesis regarding the higher force sensitivity at the edges and discovered a correlation between mechanochromism and thermochromism.
Article
Mechanics
Abbasali Abouei Mehrizi, Qiao Liu, Hao Wang
Summary: The extended thin-film region adjacent to the contact line plays a crucial role in heat transfer and wetting dynamics by enhancing heat transfer and influencing contact line morphology. The study focused on advancing contact line morphology induced by water vapor condensation at low rates. Results showed that the morphology of the liquid film in this process differs from nonvolatile cases, with a precursor nanofilm and nanodroplets detected beyond the contact line.
Article
Physics, Applied
Shiquan Lin, Zhong Lin Wang
Summary: Inspired by TENG, scanning TENG is proposed for local surface charge density measurement using atomic force microscopy. The technique taps a conductive tip above a charged dielectric surface to induce an AC, with Fourier analysis showing a linear relation to surface charge density. Results demonstrate its power in probing nanoscale charge transfer in contact-electrification.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Bin Shi, Xuehui Gan, Chi Zhang, Haojie Lang, Kun Zou, Tianzhao Bu, Yitian Peng
Summary: The study investigates nanoscale triboelectrification and nanofriction on insulating SiO2 surface using AFM and scanning Kelvin probe microscopy. It finds that nanofriction increases with enhanced tribocharge density and decreases with reduced tribocharges due to charge diffusion. These findings provide insights into the role of nanoscale triboelectrification on nanofriction and could help control energy dissipation in sliding nanofriction.
Article
Chemistry, Multidisciplinary
Elliot J. Fuller, David S. Ashby, Celia Polop, Elena Salagre, Bhuvsmita Bhargava, Yueming Song, Enrique Vasco, Joshua D. Sugar, Paul Albertus, Tevfik Onur Mentes, Andrea Locatel, Pilar Segovia, Miguel Angel Gonzalez-Barrio, Arantzazu Mascaraque, Enrique G. Michel, A. Alec Talin
Summary: In this study, isolated LiCoO2 islands were subjected to electrochemical cycling and the spatial distribution of conductive and insulating phases was observed using conductive atomic force microscopy (c-AFM). The research findings show that smaller LCO islands have a higher conductive fraction and surface energy can dominate in smaller islands. Additionally, significant shifts in current flow were observed when force was applied to strain the islands, and the underlying mechanisms for this behavior were discussed. Comparison with photoemission electron microscopy images indicated that strain and morphology become more critical to electrochemical performance as particles approach nanometer dimensions.
Article
Chemistry, Multidisciplinary
Huimin Qiao, Pin Zhao, Owoong Kwon, Ahrum Sohn, Fangping Zhuo, Dong-Min Lee, Changhyo Sun, Daehee Seol, Daesu Lee, Sang-Woo Kim, Yunseok Kim
Summary: The triboelectric effect, a ubiquitous phenomenon in which surfaces of two materials are easily charged during contact-separation, is influenced by the competition between flexoelectricity and triboelectricity in the presence of a strain gradient. This competition can modulate the direction and amount of charge transfer, leading to a distinctive phenomenon where charge transfer is reversed with varying forces. The experimental results support the proposed mechanism and suggest that manipulating the mixed triboelectric and flexoelectric effects can modulate both the amount and direction of charge transfer.
Article
Physics, Applied
Sergio Santos, Karim Gadelrab, Chia-Yun Lai, Tuza Olukan, Josep Font, Victor Barcons, Albert Verdaguer, Matteo Chiesa
Summary: The article discusses the fruitful development of dynamic methods in the field of atomic force microscopy, focusing on quantifying forces in the nanoscale and extracting material properties from observable data. It also explores advancements in force reconstruction, experimental data fitting, and multifrequency AFM, while pointing out remaining questions and potential pathways for future advancement in the field.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Biology
Takehiko Ichikawa, Dong Wang, Keisuke Miyazawa, Kazuki Miyata, Masanobu Oshima, Takeshi Fukuma
Summary: Chemical fixatives have been found to potentially affect the nanoscale structures of cell surfaces by inducing aggregation of membrane proteins. However, research in this area has been limited due to the lack of methods for observing cell surface structures at the nanoscale. In this study, a method using atomic force microscopy and a microporous silicon nitride membrane was developed to observe cell surfaces with high resolution. The results showed that commonly used fixatives increased the size of protrusions on the cell surface, indicating the aggregation of membrane proteins caused by the fixatives.
COMMUNICATIONS BIOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Shannon W. Boettcher, Meikun Shen, Aaron J. Kaufman, Jiawei Huang, Celsey Price
Summary: This study reveals the heterogeneity in charge carrier selectivity of semiconductor photocatalyst particles using a combination of ex situ and in situ conducting atomic force microscopy experiments and new test structures. The presence of the water/electrolyte interface is found to be critical for inducing hole selectivity, and pH-dependent measurements suggest the importance of negative surface charge on the semiconductor in inducing hole selectivity.
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
Chemistry, Multidisciplinary
Wujoon Cha, Matthew F. Campbell, Kathryn Hasz, Samuel M. Nicaise, Drew E. Lilley, Takaaki Sato, Robert W. Carpick, Igor Bargatin
Summary: The new cantilever probes with hollow cross-sections and alumina walls demonstrate lower spring constants and higher bandwidths compared to traditional solid counterparts, allowing for quicker response to topography changes while being more resistant to wear.
Article
Chemistry, Physical
Zhe Chen, Seong H. Kim
Summary: This study used atomic force microscopy to investigate the effect of water and n-pentanol adsorption on the nanoscale friction of graphite. The results showed that as the humidity increases, friction on the basal plane increases, while friction at the step edge first increases and then decreases. Additionally, adsorption of n-pentanol decreases friction on both the basal plane and step edge.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Ceramics
Nikolay Kalanda, Marta Yarmolich, Alexander Burko, Aleksandr Temirov, Aleksandr Kislyuk, Sergey Demyanov, Kilian Lenz, Juergen Lindner, Dong-Hyun Kim
Summary: Using ultrasonic dispersion with optimized conditions, a single-phase nanosized Sr2FeMoO6-delta powder with highly ordered Fe and Mo cations was successfully synthesized. The powder exhibited a magnetically inhomogeneous state, composed of superparamagnetic and ferrimagnetic phases. The ferrimagnetic component showed higher values and smoothly increased until reaching saturation as the temperature decreased. The absence of exchange magnetic interaction between the grains in the superparamagnetic phase suggested a critical size for nanoparticles and confirmed the absence of the frozen state in some particles. These findings are important for understanding the magnetic properties and magnetization features of the polydisperse Sr2FeMoO6-delta powder, which has potential applications in spintronic devices.
CERAMICS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Irena Spasojevic, Albert Verdaguer, Gustau Catalan, Neus Domingo
Summary: The study investigates the dynamic writing of domains in BaTiO3 thin films by varying scanning speeds at different relative humidities. Results show that the critical speed for domain writing increases non-monotonically with relative humidity, while the width of line domains exhibits a power law dependence on writing speed. The size of written domains and the creep-factor mu describing domain wall kinetics follow water adsorption behavior.
ADVANCED ELECTRONIC MATERIALS
(2022)
Review
Biochemistry & Molecular Biology
Elzbieta Pach, Albert Verdaguer
Summary: SEM, a powerful imaging technique, is now able to study ice at nanoscale by introducing water vapor and controlling sample temperature. Many studies have focused on using SEM to study ice nucleation, morphology, thaw, and clarify ice nucleation mechanisms as well as study ice dynamics. Research in this field aims to elucidate the present and future of SEM applied to ice studies.
Article
Chemistry, Multidisciplinary
Ahmed E. Salih, Mohamed Elsherif, Fahad Alam, Matteo Chiesa, Haider Butt
Summary: In this study, gold nanoparticles (GNPs) were functionalized with 3-mercaptopropionic acid (GNPs-MPA) and doped into hydrogel materials using the breathing-in/breathing-out (BI-BO) method. The pH-responsive optical and colorimetric properties of the GNPs-MPA solutions and gels were investigated through UV-Vis spectroscopy and microscopy. The results showed that the color of the solutions and gels changed from red to indigo with a decrease in pH, indicating their potential as pH-triggered sensors.
Article
Physics, Applied
Tuza Olukan, Jekaterina Sydorenko, Atanas Katerski, Mariam Al Mahri, Chia-Yun Lai, Abdulrahman Al-Hagri, Sergio Santos, Matteo Chiesa
Summary: The synthesis of TiO2 thin films using chemical spray pyrolysis method with different ratios of titanium isopropoxide (TTIP) to acetylacetone (AcacH) has demonstrated the highest photodegradation at a ratio of 1:8. These films show promise in indoor pollution treatment. The incorporation of carbon into the surface and TiO2 lattice may contribute to the observed performance, but the mechanism is still unclear. Here, the correlation between contact potential difference (CPD) contrast maps and functionality dependence on the TTIP to AcacH ratio is reported, suggesting a faster transfer of charge carriers to the surface.
APPLIED PHYSICS LETTERS
(2022)
Article
Energy & Fuels
Mohammed Bin Afif, Abdulla Bin Afif, Harry Apostoleris, Krishiv Gandhi, Anup Dadlani, Amal Al Ghaferi, Jan Torgersen, Matteo Chiesa
Summary: The rapidly declining costs of renewable energy technologies have made solar and wind the cheapest sources of energy in many parts of the world. This not only enables the rapid decarbonization of the electricity sector but also reduces the costs of energy-intensive decarbonization efforts in other areas.
Article
Materials Science, Multidisciplinary
Andres Gomez, Vladimir V. Palyulin, Gleb V. Ryzhakov, Nikolai V. Brilliantov, Evgeniy V. Dubrovin, Albert Verdaguer, Jordi Sort
Summary: We have developed an experimental method for in-situ stress measurement at the nanoscale, based on the piezoelectric effect in the contact zone between a probe and a pyroelectric crystal. We have demonstrated that the continuum theory of elasticity and piezoelectricity remain valid at the nanoscale. Moreover, we have shown that the stress in the bulk of the contacting bodies can also be reconstructed, opening the way to 3D stress nanotomography.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Engineering, Electrical & Electronic
Srinivasa Reddy Tamalampudi, Ghada Dushaq, Nitul S. Rajput, Matteo Chiesa, Mahmoud S. Rasras
Summary: In this study, 50 nm thick amorphous indium telluride films were fabricated using RF sputtering technique on a silicon substrate. These films were then used to create back-gated field-effect photodetectors. The detectors exhibited a broad wavelength response, high photo responsivity, and good frequency response. They also showed excellent stability under ambient conditions.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Psychology, Biological
Fengyuan Liu, Petter Holme, Matteo Chiesa, Bedoor AlShebli, Talal Rahwan
Summary: Using algorithmic tools, researchers found pervasive gender inequalities among academic editors, with only 8% of editors-in-chief being women. Men editors were more likely to self-publish in the journal they edit. Career length explains the gender gap among editors, but not editors-in-chief.
NATURE HUMAN BEHAVIOUR
(2023)
Article
Physics, Applied
Sergio Santos, Karim Gadelrab, Tuza Olukan, Josep Font, Victor Barcons, Matteo Chiesa
Summary: Quantifying conservative forces in multifrequency atomic force microscopy involves solving the general equations expressed in terms of interaction energies. Power law expressions are commonly used for electrostatic, ferroelectric, magnetic, or long range forces. This study discusses long range forces modeled using power laws with exponent values ranging from 2-5, and applies multifrequency theory to explore the relevant parameter space. Numerical integration of motion equations shows a narrow range of operational parameters for valid approximations during imaging, with errors as low as 10% for all explored exponents.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Sergio Santos, Karim Gadelrab, Lamiaa Elsherbiny, Xaver Drexler, Tuza Olukan, Josep Font, Victor Barcons, Matteo Chiesa
Summary: The multifrequency formalism is generalized and exploited in bimodal and trimodal atomic force microscopy (AFM) to quantify van der Waals interactions with small forces. The use of higher modes in the multifrequency force spectroscopy formalism, including trimodal AFM, improves material property quantification compared to bimodal AFM. Bimodal AFM with the second mode is valid when the drive amplitude of the first mode is significantly larger. The present approach allows for robust quantification of weak long range forces and extends the available channels for high resolution.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Proceedings Paper
Computer Science, Artificial Intelligence
Odin Foldvik Eikeland, Filippo Maria Bianchi, Inga Setsa Holmstrand, Sigurd Bakkejord, Matteo Chiesa
Summary: In this study, we focused on a power grid in the Arctic region of Northern Norway to detect power disturbances and identify significant variables using machine learning techniques. The results showed that linear models achieved the highest performance in fault detection, with flicker amount and gust wind speed being identified as important factors in explaining the disturbances.
INTELLIGENT TECHNOLOGIES AND APPLICATIONS
(2022)