Article
Engineering, Electrical & Electronic
Ryota Fukuzawa, Daichi Kobayashi, Takuji Takahashi
Summary: Electrostatic force microscopy (EFM) is used to examine the electrostatic force between an AFM tip and sample surface, allowing evaluation of their capacitance and surface potential. The dependences of the electrostatic force on dc voltage and ac voltage frequency can be used to investigate carrier density, carrier type, and deep-level states in a semiconductor. Proper distance control is necessary in EFM to ensure accurate measurements, and the oscillation amplitude of a cantilever can be effectively used for feedback control. The 1 A-mode operation in EFM shows good robustness against the strong electrostatic force and allows proper measurements of tip-sample capacitance.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Polymer Science
Liliana Porojan, Roxana Diana Vasiliu, Mihaela Ionela Birdeanu, Sorin Daniel Porojan
Summary: The study aimed to investigate the effect of different surface treatments on the surface morphology of different resin composite materials. The results showed that sandblasting, tribochemical treatment, and etching could increase surface roughness, while polishing and glazing could make the surface smoother. Surface roughness values were within clinically acceptable limits for all tested methods.
Editorial Material
Multidisciplinary Sciences
Telmo O. Paiva, Albertus Viljoen, Yves F. Dufrene
Summary: Advancements in atomic force microscopy (AFM) techniques and methodologies in microbiology have enhanced our understanding of microbial cell surfaces. Recent studies have shown that AFM imaging of cells and membranes at or near molecular resolution enables detailed visualization of membrane-drug interactions.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Paolo Pellegrino, Isabella Farella, Mariafrancesca Cascione, Valeria De Matteis, Alessandro Paolo Bramanti, Antonio Della Torre, Fabio Quaranta, Rosaria Rinaldi
Summary: In recent years, Atomic Force Microscope (AFM)-based nanolithography techniques have become increasingly powerful. However, conventional methods are inefficient, have low pattern formation rates, and are complex to execute. In this study, we developed a simple and effective nanopatterning technique called Pulse-Atomic Force Lithography (P-AFL), which enabled us to pattern 2.5D nanogrooves on a thin polymer layer with sub-nanometre resolution, high accuracy, and reproducibility. We investigated the effects of P-AFL parameters on the morphology of 2.5D nanostructures and optimized the nanolithography process to achieve unconventional shape nanostructures with high accuracy and fidelity.
Article
Engineering, Marine
Xiuqing Xing, My Ha Dao, Baili Zhang, Jing Lou, Wei Siang Tan, Yongdong Cui, Boo Cheong Khoo
Summary: In this study, the gappy Proper Orthogonal Decomposition (POD) method is used to fuse wind-tunnel measured pressure data and computational fluid dynamics (CFD) simulation results, reconstructing the pressure field and calculating the force coefficients on a marine vessel. The technique is demonstrated for wind load evaluations on the LNG carrier GALEA. The results show a reasonable agreement with the wind-tunnel measured results and those obtained from CFD simulations.
Article
Engineering, Multidisciplinary
Stefania Fresca, Andrea Manzoni
Summary: DL-ROMs are proposed to overcome limitations of conventional ROMs, but require expensive training. The proposed method combines POD and multi-fidelity pretraining to avoid the costly training stage of DL-ROMs.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Tianyao Zhang, Haibo Yu, Jialin Shi, Xiaoduo Wang, Hao Luo, Daojing Lin, Zhu Liu, Chanmin Su, Yuechao Wang, Lianqing Liu
Summary: This paper proposes an imaging method that combines atomic force microscopy with microlens-based scanning optical microscopy, which can achieve cross-scale rapid imaging and improve the efficiency of large-scale imaging and detection.
Article
Chemistry, Physical
A. Rodriguez, M. S. Jaman, O. Acikgoz, B. Wang, J. Yu, P. G. Grutzmacher, A. Rosenkranz, M. Z. Baykara
Summary: Ti3C2Tx nano-sheets exhibit solid lubrication properties on the nanoscale, reducing friction on silicon dioxide substrates, although not as effectively as few-layer graphene. This paves the way for further investigations into nanoscale solid lubrication achieved by Ti3C2Tx (MXene) nano-sheets.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
Junyuan Geng, Hao Zhang, Xianghe Meng, Weibin Rong, Hui Xie
Summary: A novel atomic force microscopy technique based on the orthogonal cantilever probe (OCP) was proposed for measuring the sidewall of micro/nanostructures. The OCP can detect the interaction force between the tip and the sample, allowing for precise imaging of steep sidewalls and horizontal surfaces. Experimental results showed that surface modification effects on the sidewall were significantly different from other positions.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Materials Science, Composites
Ayse Cagil Kandemir, Fatma Donmez, Hatice Kaplan Can
Summary: This study focuses on achieving mechanical enhancements in biocompatible organic coatings by using solvent-based method to produce biocompatible nanocomposites. The addition of bentonite nanoclays as constituents leads to significant improvements in mechanical properties. The increase in volume fraction of bentonite nanoclays is primarily responsible for the considerable enhancements in hardness and modulus values.
POLYMER COMPOSITES
(2023)
Article
Chemistry, Multidisciplinary
Yijie Liu, Xuexuan Li, Yuliang Zhang, Lin Ge, Yingchun Guan, Zhen Zhang
Summary: This study presents a novel approach, the ultra-large scale stitchless atomic force microscopy (ULSS-AFM), which combines a compliant nano-manipulator (CNM) to enable high-throughput characterization of an area of up to 1 x 1 mm(2). Experimental results demonstrate the effectiveness of the ULSS-AFM in different scanning ranges, modes, resolutions, and frequencies. Compared to conventional AFMs, this approach allows for the characterization of ultra-large scale samples without stitching or bow errors, expanding the scanning area of traditional AFMs by two orders of magnitude and opening up important avenues for cross-scale scientific research and industrial applications in nano- and microscale.
Article
Construction & Building Technology
Yueqin Hou, Jia Li, Xiaoping Ji, Haiwei Zou, Chaohui Wang, Xiangzheng Fang
Summary: This study investigated the influence of water on the adhesive behavior between asphalt binder and aggregate at various scales. The results showed that water significantly altered the surface morphology and energy of the asphalt binder, leading to a decrease in adhesion.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Chemistry, Applied
Sicong Yan, Shuai Yuan, Qian Zhang, Man Luo, Dongling Qiao, Fatang Jiang, Hong Qian
Summary: This study investigated the effects of drying temperature, plasticizer type and dosage on the molecular structure of konjac glucomannan (KGM), agar, and curdlan polysaccharides. The results showed that the molecular morphology of different polysaccharides changed at different drying temperatures. Adding a suitable amount of plasticizer can relieve the shrinkage of hydrophilic polysaccharide molecular chains during drying. Glycerol showed better performance in relieving molecular chain shrinkage compared to Tween 20 and Tween 80. Lastly, a new method for preparing polysaccharide samples for atomic force microscopy (AFM) was proposed, which provided a new idea for observing polysaccharide morphology.
FOOD HYDROCOLLOIDS
(2023)
Article
Engineering, Mechanical
Zihan Li, Yongda Yan, Jiqiang Wang, Chen Li, Yanquan Geng
Summary: The formation mechanism of bundle structures on polycarbonate surfaces is investigated by reciprocal scratching experiments. The bundle structure is accumulated by the continuous stacking of the plowed sample materials, and the stick-slip behavior is enhanced with increased scratching times. This work reproduces the formation process of bundle structure in experiments for the first time and provides further insight into the friction behavior of polymers.
Letter
Chemistry, Multidisciplinary
Pauline J. Kolbeck, Mihir Dass, Irina V. Martynenko, Relinde J. A. van Dijk-Moes, Kelly J. H. Brouwer, Alfons van Blaaderen, Willem Vanderlinden, Tim Liedl, Jan Lipfert
Summary: Atomic force microscopy (AFM) is a powerful technique for high-resolution imaging of molecules, macromolecular complexes, and nanoparticles. However, the shape of the AFM tip can distort the images. In this study, we use a 3D DNA origami structure as a fiducial for tip reconstruction and image correction. The fiducial has sharp steps at different heights, allowing reliable tip reconstruction with as few as ten fiducials. This fiducial enables accurate and precise AFM imaging for a wide range of applications.
