Article
Chemistry, Physical
Tao He, Matthias Stolte, Yan Wang, Rebecca Renner, P. Paul Ruder, Frank Wuerthner, C. Daniel Frisbie
Summary: Chemical doping strategy for organic semiconductors targeting crystallographic step edges leads to significant improvement in electron transport properties, with a tenfold increase in electron mobility and a switch from thermally activated to band-like behaviour. This approach provides evidence for doping-induced space charge and suggests new site-specific doping strategies for organic semiconductors, deviating from traditional randomly distributed substitutional impurities. The presence of doping-induced electron atmospheres in organic systems is confirmed, aligning with expectations from conventional solid-state theory.
Article
Chemistry, Physical
Yangchao Xia, Yaowen Xing, Xiahui Gui, Yijun Cao
Summary: This study used chemical force microscopy to characterize the interaction forces between a mineral surface and two collector molecules, and demonstrated that AFM is a credible technique for investigating the interaction mechanism between a mineral and a collector at a molecular level, providing critical guidance for future collector screening and design.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Paper & Wood
Claudia Gusenbauer, Karolina Peter, Etienne Cabane, Johannes Konnerth
Summary: Chemical force microscopy allows visualization of chemical nano-properties of materials and analysis of their surface behavior, making it valuable for studying natural substrates like wood. By studying adhesion forces and pK(a) values, this method provides insights into the complex chemical surface properties of materials.
Article
Chemistry, Multidisciplinary
Damla Yesilpinar, Bertram Schulze Lammers, Alexander Timmer, Zhixin Hu, Wei Ji, Saeed Amirjalayer, Harald Fuchs, Harry Moenig
Summary: Dedicated methods in atomic force microscopy provide fundamental insights into atomic interactions by measuring threshold forces needed to move single adsorbed atoms or molecules. However, the chemical and structural properties of the probe-tip can significantly influence the results, emphasizing the importance of establishing atomically defined contacts.
Article
Chemistry, Physical
Yu Zheng, Ali A. Alizadehmojarad, Sergei M. Bachilo, R. Bruce Weisman
Summary: Understanding the conformations of single-stranded DNA on carbon nanotube surfaces is crucial for various applications. In this study, we found evidence of partial desorption of DNA strands from the nanotube surface under common conditions. This desorption is caused by steric interference between neighboring DNA strands and decreases with decreasing concentration of free DNA.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Energy & Fuels
Yangchao Xia, Yaowen Xing, Xiahui Gui, Yijun Cao
Summary: In this study, the interactions between hydrocarbon oil and hydrophilic mineral surfaces were explored using CFM and MD simulations. Different functional groups were found to significantly influence the adhesion force between the oil collector and mineral surface, with polar hydrocarbon oils adhering strongly to the surface. The combination of MD and CFM provided a theoretical reference for mineral flotation separation.
Article
Chemistry, Physical
Miles F. Beaux, Reuben J. Peterson, Igor O. Usov
Summary: Atomic force microscopy was used to map the topography and qualitative mechanical characteristics of gallium-stabilized delta-phase plutonium coupons. The initial rough and heterogeneous surface of plutonium was observed, along with distinct striation patterns in qualitative nanomechanical mapping. Investigation suggested that the striations were not measurement artifacts or plutonium-specific features, and were influenced by mechanical working of the surface.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Physical
Mariano D. Jimenez-Sanchez, Nicoleta Nicoara, Jose M. Gomez-Rodriguez
Summary: The functionalization of AFM tips with Xe has been proven as an effective method to enhance resolution for intramolecular features. This study explores the adsorption of Xe on graphene on Pt(111) surfaces, laying the groundwork for in-situ tip functionalization with Xe on these surfaces. Results demonstrate the formation of well-ordered Xe islands in the submonolayer regime and the potential of using force spectroscopy to distinguish these islands from bare graphene areas.
APPLIED SURFACE SCIENCE
(2021)
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
Chemistry, Physical
Jiangling Su, Alejandro Gonzalez Orive, Guido Grundmeier
Summary: This study analyzes the pH-dependent adhesion of micropatterned electrografted aryldiazonium salts on gold substrates, and shows that the aminophenyl (C6H5-NH2) terminated surface exhibits higher adhesion forces compared to the nitrophenyl (C6H5-NO2) group at different pH values.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Myung Gi Ji, Qiang Li, Rana Biswas, Jaeyoun Kim
Summary: Experimental study of nanopatterned tribocharges on elastomer surfaces revealed distinct fast and slow decay components attributed to different tribocharging mechanisms, providing insights into the temporal behavior and stability of tribocharges at the nanoscale level.
Article
Chemistry, Physical
David Feldmann, Bat-El Pinchasik
Summary: The adhesion of droplets to surfaces is highly sensitive to the direction of chemical heterogeneities, as shown by bending beam and droplet roll-off experiments. The shape of the fluid contact line on the microscale elucidates the origin of this direction-dependent adhesion. These findings improve the understanding of droplet adhesion to surfaces with chemical heterogeneities and directional transport phenomena.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
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, Analytical
Xinyu Li, Li Zhao, Rongrong Feng, Xiaowei Du, Zelin Guo, Yu Meng, Yulan Zou, Wenchao Liao, Qiyuan Liu, Yaohuan Sheng, Gaowei Zhao, Haijian Zhong, Weidong Zhao
Summary: Using atomic force microscopy, it was found that Na(V)1.5 is irregularly distributed on the surfaces of both normal and cancer breast cells, with higher expression on cancer cells. The stability of the Na(V)1.5-antibody complex is higher on normal breast cells compared to cancer breast cells. These findings provide insights into the interactions of ion channel-antibody systems and the role of sodium channels in tumor metastasis and invasion.
ANALYTICAL METHODS
(2023)
Article
Instruments & Instrumentation
Tim Sander, Yi Liu, Tuan Anh Pham, Maximilian Ammon, Mirunalini Devarajulu, Sabine Maier
Summary: In situ cleaving under ultra-high vacuum conditions is a reliable and direct method for preparing clean and atomically well-defined surfaces. A versatile sample cleaver is presented in this study that efficiently prepares ionic crystal surfaces under ultra-high vacuum conditions and is compatible with existing vacuum chambers equipped with an xyz-manipulator. The cleaver design incorporates the cleaving blade and anvil, eliminating the need for a particularly strong mechanical manipulator.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)