Article
Astronomy & Astrophysics
Sreemanti Chakraborti, Jonathan L. Feng, James K. Koga, Mauro Valli
Summary: The gamma factory proposal aims to produce high-energy photon beams at the LHC for discovering weakly-interacting particles. It has the potential to detect couplings lower than other terrestrial experiments and complements astrophysical observations.
Article
Chemistry, Multidisciplinary
Younji Ko, Jinho Park, Jeongmin Mo, Seokmin Lee, Yongkwon Song, Yongmin Ko, Hoyoung Lee, Yongju Kim, June Huh, Seung Woo Lee, Jinhan Cho
Summary: In this study, highly porous electrocatalytic electrodes based on cotton were prepared using metal nanoparticle assembly-driven electroplating, showing low overpotentials and fast reaction kinetics. The cotton was successfully converted into highly electrocatalytic textiles while maintaining their 3D porous structure. The resulting hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) electrodes exhibited remarkably low overpotentials and good stability during operation.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Spectroscopy
Andrey Morozov, Tatiana Nazdracheva, Andrei Kochur, Victor Yavna
Summary: This study aims to investigate the influence of solvate shells interaction on the profiles of infrared spectra of sodium chloride solutions. Experimental measurements of infrared spectra were conducted on distilled water and sodium chloride solutions at limit and half-limit concentrations. Theoretical calculations using the DFT approach with the XLYP exchange-correlation potential were employed to compute the infrared spectra profiles for clusters containing 9 water molecules and one NaCl molecule. The results showed that the infrared spectrum is mainly influenced by the interaction of Na+ and Cl- solvation shells, each consisting of 4 water molecules, with the 9th water molecule providing bonding between the solvated ions.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Multidisciplinary
Ziyun Li, Xiaoyue He, Qizhu Qian, Yin Zhu, Yafei Feng, Wentao Wan, Genqiang Zhang
Summary: This research reports a promising active site implantation strategy for a Ni(OH)2 nanowire network electrode on nickel foam substrate by Ru doping. The electrode functions as a dual-function catalyst for hydrazine oxidation and hydrogen evolution, achieving ultralow working potential and small overpotential. Furthermore, the study demonstrates the practicality of the electrolysis process by constructing a flow electrolyzer that achieves industry-level hydrogen production with record-low voltage.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Makoto Suzuki, Akira Tsuchiko, Yoshiyuki Tanaka, Nobuyuki Matubayasi, George Mogami, Nobuyuki Uozumi, Satoshi Takahashi
Summary: High-resolution measurements of microwave dielectric relaxation and Raman spectroscopies revealed the presence of hyper mobile water and a marked OH stretching band in ds 10-mer DNA solution. The LA band, observed at the low wavenumber tail of water's major OH stretching band, is formed by collective OH stretching vibrations of water molecules around the backbone phosphate oxygen atoms. The LA band intensity is affected by the addition of Mg(II) or Ca(II) ions, and this effect is reduced in the presence of 0.14 M KCl.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Chemistry, Physical
Nishith Ghosh, Anisha Bandyopadhyay, Subhadip Roy, Gunomoni Saha, Jahur Alam Mondal
Summary: This study investigates the hydrogen-bond structure of metal ion hydration shells using Raman difference spectroscopy. The results show that high charge density metal ions can enhance or reduce the hydrogen-bond structure in the hydration shell, which is important for understanding the hydration behavior of cations and the ultrafast energy dissipation.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Archaeology
C. L. Shaw
Summary: FTIR spectroscopy has played a crucial role in understanding the use of fire in prehistory by identifying heated bone. However, the specific effects of heating variables on certain spectral bands have not been extensively researched. This study investigates the impact of temperature, duration, and bone size on the appearance of a specific band in the FTIR spectrum, and proposes a quantitative method to assess the degree of bone heating.
JOURNAL OF ARCHAEOLOGICAL SCIENCE-REPORTS
(2022)
Article
Spectroscopy
Partha Pyne, Nirnay Samanta, Animesh Patra, Aritra Das, Pratik Sen, Rajib Kumar Mitra
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2020)
Article
Chemistry, Physical
Subhamoy Saha, Subhadip Roy, P. Mathi, Jahur A. Mondal
JOURNAL OF PHYSICAL CHEMISTRY A
(2020)
Article
Chemistry, Physical
Subhadip Roy, Animesh Patra, Subhamoy Saha, Dipak K. Palit, Jahur Alam Mondal
JOURNAL OF PHYSICAL CHEMISTRY B
(2020)
Article
Chemistry, Physical
Subhadip Roy, Jahur Alam Mondal
Summary: Research shows that ions have a strong correlation with the structure of hydrogen bonding at the air/water interface and in bulk water. Specifically, structure-breaking anions decrease hydrogen bonding at the interface, while structure-making anions have the opposite effect. None of the electrolytes studied significantly affect the orientation of water molecules at the interface.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Subhadip Roy, Jahur Alam Mondal
Summary: The study reveals that the perturbation of interfacial water by kosmotropic electrolytes causes a stronger hydrogen bond formation with surface-expelled anions, resulting in a more heterogeneous interface.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Chemistry, Multidisciplinary
Sonali Mondal, Partha Pyne, Animesh Patra, Rajib Kumar Mitra, Soumen Ghosh
Summary: Polymer/surfactant composites have attracted interest for their diverse applications, and the improved solution properties have been linked to the formation of premicellar surfactant aggregate-polymer complexes (PS) at low surfactant concentrations. Studies show that longer tail surfactants facilitate the formation of PS, leading to enhanced polymer cross-linking and greater solution viscosity. PS with shorter tail surfactants have a more polar interior, while PS with longer tail surfactants exhibit stronger packing due to favorable interactions between polymer polar groups and surfactant headgroups.
Article
Chemistry, Physical
Subhadip Roy, Animesh Patra, Dipak K. Palit, Jahur Alam Mondal
Summary: The interaction between trimethylamine N-oxide (TMAO) and charged/uncharged moieties of proteins and lipids plays a crucial role in the multifaceted biofunctions of TMAO. Through minimum area Raman difference spectroscopy (MA-RDS) analysis, it was found that TMAO interacts differently with cationic and uncharged hydrophobes, influenced by van der Waals forces and electrostatic interactions, affecting the exposure of its methyl groups in water.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Chemistry, Physical
Nishith Ghosh, Subhadip Roy, Jahur Alam Mondal
Summary: Perfluoro compounds, commonly used in manufacturing processes, lead to bioaccumulation and negative effects on human health. This study investigated the perturbation of lipid monolayers on the water surface by a prototype perfluorinated persistent organic pollutant, highlighting the disruption of lipid arrangements and interfacial electric fields by PFHA, influenced by specific interactions with lipid headgroups and oleophobic fluoroalkyl chains.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Chemistry, Multidisciplinary
Sonali Mondal, Sumana Pyne, Partha Pyne, Animesh Patra, Rajib Kumar Mitra, Soumen Ghosh
Summary: Polymer/surfactant composites are used as excipients for water-insoluble solutes, with enhanced dissolution ability attributed to the formation of pre-micellar polymer surfactant aggregates (PS) at lower concentrations than the surfactant critical micelle concentration in water. This study investigates the microscopic interfacial structure of PS in composite media, including interface electrostatics and surface polarity. It is found that changing the polymer concentration in a composite system can regulate the counter-ion binding ability, surface potential, charge density, packing, and surface polarity of the PS interface, leading to increased solute dissolution. The modulation of the PS interface also acts as a barrier for the relocation of water-soluble charged solutes into the PS pseudo-phase, as shown by fluorescence anisotropy studies.
Article
Multidisciplinary Sciences
Yao Hsiao, Ting-Han Chou, Animesh Patra, Yu-Chieh Wen
Summary: The hydrogen-bonding network of water at charged aqueous interfaces plays a direct role in controlling energy transfer and chemical reactions. However, characterizing these water layer structures is challenging. In this study, we develop an all-optic solution using sum-frequency spectroscopy to retrieve the vibrational spectra of the bonded water layer and ion diffuse layer, providing microscopic structural and charging information about the interface. The method is applied to model surfactant-water and lipid-water interfaces, revealing hidden water species and polarized water layer structures. This all-optic method offers a promising approach for studying electrochemical and biological interfaces.
Article
Chemistry, Physical
Biswajit Manna, Dipak K. Palit
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)