Article
Materials Science, Paper & Wood
Jongcheol Lee, Arielle M. Chaves, Juseok Choi, Alison W. Roberts, Seong H. Kim
Summary: This study used microscopic sum frequency generation (SFG) vibrational spectroscopy to analyze the cellulose microfibril (CMF) organization in different regions of P. patens leaves. The results showed that CMFs in the midrib and marginal cell walls exhibited highly aligned and tilted characteristics, while CMFs in the lamina cell walls had no preferential orientation. These findings reveal the structural differences of cell walls in P. patens leaves and their functional implications.
Article
Instruments & Instrumentation
Alexander J. Farnsworth, Shawn C. Averett, Matthew C. Asplund, James E. Patterson
Summary: This study reveals that the temporal profile of nonresonant SFG response in single-crystal Si varies with crystal facing and sample orientation, and differs significantly from what is observed in polycrystalline Au. These findings have important implications for the use of time-delay methods in suppressing nonresonant signal and post-processing time-resolved or phase-sensitive SFG measurements.
APPLIED SPECTROSCOPY
(2023)
Article
Chemistry, Multidisciplinary
Saman Hosseinpour, Vanessa Goetz, Wolfgang Peukert
Summary: This study used surface-sensitive SFG spectroscopy to demonstrate that the adsorption of surfactants to the oil/water interface increases the interfacial electric field and enhances the ordering of interfacial oil molecules. At high surfactant concentrations, the interfacial charge peaks and the interfacial oil molecules arrange in a fully ordered conformation, leading to decreased interfacial tension and increased emulsion stability.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Materials Science, Multidisciplinary
Aizitiaili Abulikemu, Muneaki Hase
Summary: We present a direct generation of efficient and wavelength-tunable third-harmonic generation from ultrapure electronic-grade diamond crystals. The THG efficiency of approximately 0.7% at a wavelength of 427 nm can be achieved under an ultrafast infrared excitation at 1280 nm, and the THG signal can be tuned over a broad range from 420 to 730 nm. The high THG efficiency is attributed to the minimal absorption loss and phase-matching conditions in the electronic-grade diamond.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Engineering, Mechanical
Xianzhang Wang, Yuan Liu, Liran Ma, Xuefeng Xu, Yu Tian
Summary: This study investigates the molecular arrangement and orientation of SDBS at the solid/liquid interface using SFG-VS. The results show that the arrangement of SDBS becomes more ordered with increasing concentration, while the orientation angle decreases. Friction has an effect on the conformation order and orientation angle.
Article
Chemistry, Physical
Md. Abdus Sattar, Hien Thi Thu Khuat, Yoshihiro Miyauchi, Goro Mizutani, Harvey N. Rutt
Summary: The desorption kinetics of hydrogen from the H-Si (111)1 x 1 surface prepared by molecular hydrogen exposure were studied using optical sum frequency generation (SFG) and second harmonic generation (SHG) techniques at different sample temperatures. The results showed that the activation energy for second order desorption was Ed = 60.1 +/- 8.8 kcal/mol (2.60 +/- 0.38 eV) for coverage above 0.44 ML, while for first order desorption with coverage below 0.18 ML, the activation energy was Ed = 32.6 +/- 8.1 kcal/mol (1.41 +/- 0.35 eV).
Article
Chemistry, Physical
Foad Raji, Cuong V. Nguyen, Ngoc N. Nguyen, Tuan A. H. Nguyen, Anh Nguyen
Summary: The hypothesis states that adsorption of divalent heavy metal ions at the mineral-water interfaces leads to changes in interfacial chemical species and charges, interfacial water structure, Stern and diffuse layers. This study used sum-frequency generation spectroscopy to probe the changes in vibrational resonances of interfacial OH as a response to DHMI concentration and pH. The findings revealed three surface charge reversals at different pH levels, indicating significant alterations in the structure of interfacial waters.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Multidisciplinary Sciences
Sunil Kumar Sahu, Min Liu, Yewen Chen, Jinshan Gui, Dongming Fang, Xiaoli Chen, Ting Yang, Chengzhong He, Le Cheng, Jinlong Yang, Durgesh Nandini Sahu, Linzhou Li, Hongli Wang, Weixue Mu, Jinpu Wei, Jie Liu, Yuxian Zhao, Shouzhou Zhang, Michael Lisby, Xin Liu, Xun Xu, Laigeng Li, Sibo Wang, Huan Liu
Summary: Wood is an important and renewable source of energy, but there are still many aspects of its formation that have not been studied. In this study, chromosome-scale genome assemblies of three timber trees were performed, providing valuable genetic resources for comparative genomic analyses and a better understanding of wood properties in non-model woody species.
Article
Chemistry, Multidisciplinary
Svyatoslav Tolstikov, Irina Golomolzina, Sergey Fokin, Artem Bogomyakov, Vitaly Morozov, Sergey Tumanov, Olga Minakova, Sergey Veber, Matvey Fedin, Sergey A. Gromilov, Galina Romanenko, Victor Ovcharenko
Summary: The study synthesized Cu(hfac)(2) complex with a paramagnetic ligand in two polymorphs, alpha and beta. Despite structural similarity, the two forms exhibit significant differences in magnetic properties. The beta form undergoes a reversible spin transition, while the alpha form transforms irreversibly into the beta form.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Optics
K. Kitano, H. Maeda
Summary: We investigated the superfluorescent decay process of dense rubidium atomic vapor in a cell. Using a femtosecond laser pulse, the atoms were excited and emitted various fields with specific time delays. The experimental results were successfully reproduced using semiclassical simulations.
Article
Chemistry, Physical
Daniel E. Cotton, Sean T. Roberts
Summary: SFG spectroscopy enhances understanding of chemical interfaces in various fields but interpreting spectra with multiple internal interfaces is challenging. Study shows that under specific experimental conditions, SFG signals from a particular interface can be isolated and amplified, providing general guidelines for experimental design.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Review
Chemistry, Applied
Holly Allen, Donghui Wei, Ying Gu, Shundai Li
Summary: This review summarizes the major hypotheses and advancements made in the past century regarding the regulation of cellulose biosynthesis, with a focus on Arabidopsis thaliana.
CARBOHYDRATE POLYMERS
(2021)
Article
Chemistry, Physical
S. A. Shah, S. Baldelli
Summary: The study of surfaces provides unique information on chemical and physical properties, leading to the development of specialized tools such as SFG spectroscopy. However, the resolution of SFG imaging is often limited to micrometer length scales, making it unable to capture sub-micron features. This article introduces a technique using ground state depletion to achieve super-resolution, with proof-of-concept results showing a 3-fold improvement in resolution.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Physics, Applied
Yuka Isaka, Takayuki Miyamae
Summary: The electrostatic charging states of insulating polymer surfaces were analyzed using sum-frequency generation (SFG) spectroscopy. For negatively charged polypropylene, the SFG peak amplitudes increased significantly with increasing surface potential, indicating a direct influence of the electrostatic charges on the SFG signal intensities. In organic thin films stacked on top of PMMA, an increase in the SFG signal of buried PMMA was observed, indicating the extension of the electrostatic field into the bulk direction. Additionally, the visualization of charge location and distribution was demonstrated using SFG intensity variations.
APPLIED PHYSICS EXPRESS
(2023)
Article
Physics, Multidisciplinary
Shuai Yuan, Yunkun Wu, Zhongzhou Dang, Cheng Zeng, Xiaozhuo Qi, Guangcan Guo, Xifeng Ren, Jinsong Xia
Summary: This study demonstrates strongly enhanced second harmonic generation on thin film lithium niobate, achieving a record high conversion efficiency compared to conventional thin film materials, which could inspire the miniaturization and integration in this field.
PHYSICAL REVIEW LETTERS
(2021)
