Article
Engineering, Chemical
Manfred Ulrich Goebel, Juergen U. Keller, Karl Meller, Ingo Schmitz, Thomas Seeger, Eva Schieferstein
Summary: This paper discusses the importance of fuel vapor retaining systems in gasoline vehicles and presents measurements of the regeneration processes using high humidity gas. It also highlights the limitations of current testing procedures and quality parameters in representing real operating conditions, and suggests the need for new standards.
Article
Medicine, Research & Experimental
Karlis Berzins, Joseph I. Mapley, Keith C. Gordon, Sara J. Fraser-Miller
Summary: This work explores the potential use of spatially offset low-frequency anti-Stokes Raman spectroscopy (SOLFARS) to detect subsurface composition below an emissive surface. The study found that the commonly used midfrequency region (300-1800 cm-1) is superior for quantifying coating thickness, while a combined Stokes and anti-Stokes low-frequency region is better for quantifying underlying crystalline materials. For exploring subsurface composition, the anti-Stokes LFR spectral window performs best.
MOLECULAR PHARMACEUTICS
(2022)
Article
Nanoscience & Nanotechnology
Tianjian Lv, Bing Han, Ming Yan, Zhaoyang Wen, Kun Huang, Kangwen Yang, Heping Zeng
Summary: This article introduces a hybrid dual-comb CARS system that uses a broadband fiber laser and a highly flexible, frequency-modulated electro-optic comb to achieve high-speed spectroscopic imaging. The spectral measurement speed in the high-wavenumber C-H stretching region is an order of magnitude higher than that of state-of-the-art systems, opening up new opportunities for fast chemical sensing and imaging.
Article
Materials Science, Multidisciplinary
Xuezhang Liu, Kui Wen, Xiaohua Duan, Caihua Wang, Hangyu Long
Summary: The study investigates the effects of a dynamic magnetic field on diamond nucleation using various analysis techniques. The results show that the dynamic magnetic field enhances diamond nucleation and improves the crystal grain size and crystallinity of the deposited diamonds. The study also reveals that the angular frequency of the dynamic magnetic field affects the diamond nucleation density, and this enhancement is associated with electric field excitation.
Article
Chemistry, Physical
Huda S. AlSalem, Sven P. K. Koehler
Summary: The ultrafast dephasing times of vibrational quanta in functional groups bound to graphene were measured using time-resolved sum-frequency generation spectroscopy. Decays times of 0.8 and 1.4 ps were observed for vibrational stretches in phenyl groups attached to graphene or gold, respectively, while much faster decay times of 0.3 ps were measured for vibrations of the bond connecting H atoms to graphene in hydrogenated graphene. This difference in decay times may be due to coupling between the C-H stretch and either the two-dimensional mode of graphene or nonadiabatic coupling to electrons excited by the upconversion laser pulse.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Optics
Wenting Lou, Shutao Li, Jingliang Liu, Yuanming Guan, Yu Hou
Summary: We experimentally studied an 808 nm diode-pumped Cr4+:YAG Q-switched intracavity LBO sum-frequency Raman laser. In this laser, a c-cut Nd:GdVO4 crystal is used as the self-Raman medium, while a c-cut Nd:YVO4 crystal is only used as the Raman medium. Simultaneous pulse oscillation of first-Stokes lights at 1176, 1177, and 1096 nm is realized. An average output power of 67 mW at 568 nm is obtained through sum-frequency-mixing 1176/1177 nm light with 1096 nm light in LBO at the incident pump power of 5.09 W.
OPTICS COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Sebastian Leszczynski, Carsten Strobel, Barbara Leszczynska, Sylva Waurenschk, Soeren Roehlecke, Frank Stahr, Matthias Albert, Johann W. Bartha
Summary: This study demonstrated the integration of linear hot-wire (HW) and very high frequency plasma enhanced chemical vapor deposition (VHF-PECVD) for the fabrication of highly efficient heterojunction solar cells. The results show that dynamic HW and VH-PECVD technologies enable fabrication of high deposition rates and high passivation properties for highly efficient solar cells.
Article
Engineering, Chemical
Fung Ming Kwok, Zhanwen Sun, Wai Sze Yip, Kwong Yu David Kwok, Suet To
Summary: This study investigates the coating characteristics of drills with respect to different HFCVD processing parameters and the coating characteristics following wear from machining high-frequency PCBs. The findings show that the methane concentration, processing time, and temperature significantly affect the grain size and coating thickness of the diamond film. Drills with nanocrystalline films have a longer tool life compared to microcrystalline films, and drills with thinner films wear at a faster rate.
Article
Chemistry, Physical
Qian Xiang, Xiaofei Yue, Yanlong Wang, Bin Du, Jiajun Chen, Shaoqian Zhang, Gang Li, Chunxiao Cong, Ting Yu, Qingwei Li, Yuqi Jin
Summary: This study systematically investigates the interaction between tungsten disulfide (WS2) monolayers and substrates by low-frequency Raman spectroscopy, demonstrating the strong coupling between the sample and substrate leading to tensile strain on the WS2 monolayers. The results show the effectiveness of low-frequency Raman spectroscopy for probing sample-substrate interactions in 2D TMDs and provide guidance for high-performance device design based on 2D TMDs with desired sample-substrate coupling strength.
Article
Chemistry, Physical
Li-lin Jiang, Yun-fei Song, Wei-long Liu, Hong-lin Wu, Xi-you Li, Yan-qiang Yang
Summary: Ultrafast vibrational dynamics in pure liquid tetrahydrofuran were studied using femtosecond coherent anti Stokes Raman scattering. Different vibrational modes were observed with oscillatory decay in time-resolved spectra, providing insights into chemical reaction mechanisms in condensed-phase systems.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Engineering, Chemical
M. Ulrich Goebel, Juergen U. Keller, Karl Meller, Ingo Schmitz, Thomas Seeger, Eva Schieferstein
Summary: By measuring the adsorption and desorption behavior of activated carbon filters on fuel vapor mixtures over time, it was found that dry regeneration can enhance their long-term suitability. This study helps explain the increased filter failures due to bioethanol blends and moist regeneration fluid.
CHEMIE INGENIEUR TECHNIK
(2022)
Article
Chemistry, Multidisciplinary
Mingyeong Shin, Jinsun Park, Keunhong Jeong, Myeongkee Park
Summary: Absolute Raman cross-sections are important for quantitative analyses of condensed phases. This study focuses on solid thin films with ultralow frequency Raman characteristics. A ULF Raman spectrometer is used to determine the absolute Raman cross-sections of an alpha-S-8 film and these measurements are confirmed using density functional theory. The results can be used as a quantitative standard for thin films with ULF Raman characteristics.
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
(2023)
Article
Acoustics
Michele Gozzelino, Salvatore Micalizio, Claudio Eligio Calosso, Aldo Godone, Haixiao Lin, Filippo Levi
Summary: The article proposes a compact cavity-cell assembly based on a dielectric-loaded cylindrical resonator to reduce the core of the atomic clock while maintaining high-performing short-term stability. The structure is characterized in terms of microwave field uniformity and atom-field coupling using finite-element calculations.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2021)
Article
Materials Science, Multidisciplinary
Panagiotis Kainourgios, Ioannis A. Kartsonakis, Costas A. Charitidis
Summary: This study investigates the growth of MWCNTs on iron chloride-functionalized silica microspheres and compares the microwave absorption potential of the resulting structures. The research shows that functionalized silica microparticle substrates can increase the structural defects of MWCNTs, but their heat production performance as microwave absorbents is comparable to pristine MWCNTs.
Article
Biochemical Research Methods
Natasha N. Kunchur, Leila B. Mostaco-Guidolin
Summary: A powerful classification tool was developed using CARS microscopy and computational methods to accurately identify the progression of atherosclerotic plaque in an automated manner.
BMC BIOINFORMATICS
(2022)
