Article
Chemistry, Physical
Jacy Conrad, Peter R. Tremaine
Summary: A custom-built titanium-sapphire flow cell coupled with a confocal Raman microscope was used to analyze the Raman spectra of sodium and potassium phosphate solutions in different temperatures and pressures. The study indicated that increasing temperature strengthens the oxyanion-water hydrogen bonds, with the first experimental ionization constants reported at elevated temperatures for this reaction.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Loukia-Pantzechroula Merkouri, Juan Luis Martin-Espejo, Luis F. Bobadilla, Jose Antonio Odriozola, Anna Penkova, Tomas Ramirez Reina, Melis S. Duyar
Summary: Time-resolved operando DRIFTS-MS technique was used to reveal the CO2 capture and conversion mechanisms of NiRuNa/CeAl dual-functional material in CO2 methanation, reverse water-gas shift, and dry reforming of methane. CO2 was mainly captured in the form of carbonyls and bidentate carbonates, and a spillover mechanism was employed to obtain the desired products.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Environmental Sciences
Vera Nikolaeva, Evgeny Gordeev, Tima Sergienko, Ludmila Makarova, Andrey Kotikov
Summary: The auroral oval is a high-latitude region of the ionosphere with strong chemical composition variability due to energetic particles from the magnetosphere. Dynamic variations in the auroral zone are difficult to forecast due to complex magnetospheric processes. Understanding electron concentrations in this turbulent region is crucial for radio wave propagation conditions.
Article
Biochemistry & Molecular Biology
Karolina Beton-Mysur, Beata Brozek-Pluska
Summary: Cancers of the digestive tract, such as colorectal and gastric cancer, can be linked to oxidative stress. Raman spectroscopy was used to analyze tissue samples and cells from the human colon and stomach, revealing differences between healthy and cancerous tissues. The study also demonstrated the anti-cancer properties of antioxidants Vitamin C and E.
Article
Chemistry, Multidisciplinary
Kaiyue Zhao, Hao Yu, Haocheng Xiong, Qi Lu, Yi Qin Gao, Bingjun Xu
Summary: This study demonstrates that bulky organic cations can induce a long-range structure of interfacial water molecules and enhance the kinetics of hydrogen oxidation and evolution reactions, even when located outside the outer Helmholtz plane. The structure-making ability of these cations promotes the formation of hydrogen-bonded water chains connecting the electrode surface to the bulk electrolyte, facilitating the reactions. These findings highlight the prospect of utilizing nonlocal mechanisms to improve electrocatalytic performance.
Article
Multidisciplinary Sciences
Bin Chen, Yudong Cao, Qiaoyu Li, Zhuo Yan, Rui Liu, Yunjiao Zhao, Xiang Zhang, Minying Wu, Yixiu Qin, Chang Sun, Wei Yao, Ziyi Cao, Pulickel M. Ajayan, Mason Oliver Lam Chee, Pei Dong, Zhaofen Li, Jianfeng Shen, Mingxin Ye
Summary: This study introduces a self-healing, biocompatible, biodegradable, stretchable, and conductive material made from a gluten network cross-linked with EGaIn liquid metal. The material is demonstrated as a movement strain sensor and shows promising mechanical properties and the ability to promote skin cell proliferation.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Analytical
Hannah De Frond, Ronald Rubinovitz, Chelsea M. Rochman
Summary: Specific Raman spectral libraries for microplastics have been shown to improve spectral matching when weathered plastics and different particle colors and morphologies are included. Similarly, two new FTIR databases specific to microplastics using attenuated total reflection (mu ATR-FTIR) have been developed, demonstrating improved spectral matching and accuracy with the inclusion of libraries specific to plastic particles found in the environment. Multivariate principal component analyses of the FTIR spectra confirmed differences among polymer types and variations in principal component scores among weathered particles.
ANALYTICAL CHEMISTRY
(2021)
Article
Biochemical Research Methods
Amir Nakar, Aikaterini Pistiki, Oleg Ryabchykov, Thomas Bocklitz, Petra Roesch, Juergen Popp
Summary: Raman spectroscopy was successfully used to differentiate different pathogens of the Enterobacteriaceae family, with UV-Resonance Raman spectroscopy outperforming 532 nm excitation in genus-level classification and achieving species-level classification for Klebsiella oxytoca for the first time.
JOURNAL OF BIOPHOTONICS
(2022)
Article
Spectroscopy
Elliot J. Tay, Jonathan E. Barnsley, Daniel B. Thomas, Keith C. Gordon
Summary: Resonance Raman spectroscopy was used to identify and characterize psittacofulvins, showing different behaviors in red and yellow regions with Raman band wavenumber shifts. One yellow region exhibited similar characteristics to the red regions, suggesting the presence of psittacofulvins with greater conjugation.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Biochemical Research Methods
Amir Nakar, Aikaterini Pistiki, Oleg Ryabchykov, Thomas Bocklitz, Petra Roesch, Juergen Popp
Summary: This study used Raman spectroscopy to differentiate between resistant and sensitive strains of Escherichia coli, which can help in the rapid and accurate identification of antibiotic-resistant bacteria.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Analytical
Yeran Bai, Zhongyue Guo, Fatima C. Pereira, Michael Wagner, Ji-Xin Cheng
Summary: A mid-infrared photothermal-fluorescence in situ hybridization (MIP-FISH) platform is developed for simultaneous identification and metabolic analysis of microbes with single-cell resolution and high throughput. By improving MIP imaging, isotopically labeled compounds incorporated into proteins of individual bacterial cells can be sensitively detected, while FISH labeling with rRNA-targeted probes enables the identification of the analyzed cells. In proof-of-concept experiments, MIP-FISH successfully discriminates and identifies labeled bacterial cells within a complex human gut microbiome sample based on the clear spectral red shift in the protein amide I region caused by incorporation of 13C atoms from 13C-labeled glucose. This study opens up new opportunities for single-cell structure-function analyses in microbiology.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Analytical
Sara Asgari, Rajiv Dhital, S. Ali Aghvami, Azlin Mustapha, Yi Zhang, Mengshi Lin
Summary: A sensitive SERS-based microfluidic immunosensor was developed for the separation and detection of Escherichia coli O157:H7 in romaine lettuce. The combination of SERS nanoprobes and a hydrodynamic flow-focusing microfluidic device provides a reliable, selective, and sensitive approach for the detection of various pathogens in complex food samples.
Article
Chemistry, Multidisciplinary
Ryan Selhorst, Zhuohang Yu, David Moore, Jie Jiang, Michael A. Susner, Nicholas R. Glavin, Ruth Pachter, Mauricio Terrones, Benji Maruyama, Rahul Rao
Summary: Layered Transition Metal Dichalcogenides (TMDs) are important materials with a diverse range of optoelectronic properties. This study investigates the spatial tailoring of TMDs through electron-beam patterning, achieving high resolution and demonstrating potential for nanoscale functionalization. The modulated properties were found to be dependent on various parameters, and the results were confirmed through spectroscopic analysis and density functional theory modeling. This research provides a robust method for property modulation and functionalization of TMDs at the nanoscale.
Article
Spectroscopy
Saba Bashir, Haq Nawaz, Muhammad Irfan Majeed, Mashkoor Mohsin, Ali Nawaz, Nosheen Rashid, Fatima Batool, Saba Akbar, Muhammad Abubakar, Shamsheer Ahmad, Saqib Ali, Muhammad Kashif
Summary: This study aimed to identify and differentiate tigecycline-resistant E. coli (TREC) from tigecycline-sensitive E. coli (TSEC) using Surface-enhanced Raman Spectroscopy (SERS). Statistical analyses including PCA, HCA, and PLS-DA were employed to assess the diagnostic potential of SERS. Qualitative identification and differentiation between resistant and sensitive strains were efficiently done using PCA and HCA. PLS-DA successfully discriminated among TREC and TSEC at the strain level with 98% area under the ROC curve, 100% sensitivity, 98.7% specificity, and 100% accuracy.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Multidisciplinary Sciences
Andreij C. Gadelha, Douglas A. A. Ohlberg, Cassiano Rabelo, Eliel G. S. Neto, Thiago L. Vasconcelos, Joao L. Campos, Jessica S. Lemos, Vinicius Ornelas, Daniel Miranda, Rafael Nadas, Fabiano C. Santana, Kenji Watanabe, Takashi Taniguchi, Benoit van Troeye, Michael Lamparski, Vincent Meunier, Viet-Hung Nguyen, Dawid Paszko, Jean-Christophe Charlier, Leonardo C. Campos, Luiz G. Cancado, Gilberto Medeiros-Ribeiro, Ado Jorio
Summary: The twisted bilayer graphene undergoes self-organized lattice reconstruction, resulting in the formation of a superlattice that modulates vibrational and electronic structures, leading to phenomena such as strong correlations and superconductivity. Although experimental techniques and theoretical models face challenges in observing and describing these effects, nano-Raman spectroscopy can localize some vibrational modes and provide insights into the effects of electron-phonon coupling on the material properties.
Article
Spectroscopy
Yeming Xu, Pai Liu, Yunhong Zhang
Summary: Water content in atmospheric aerosols is crucial for understanding atmospheric chemistry and addressing environmental issues. FTIR spectroscopy is commonly used to quantify water content, but distortion in the OH stretching vibration band can affect accuracy. A new model for simulating FTIR absorption of water droplets was developed to address this issue.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Spectroscopy
Yunxia Wang, Lulu Song, Guangguo Wang, Hongyan Liu, Zhuanfang Jing, Yongquan Zhou, Fayan Zhu, Yunhong Zhang
Summary: The research investigated the existence of direct contact ion pairs (CIP) in magnesium nitrate solutions using Raman spectroscopy, molecular dynamics (MD) simulations, and density functional theory (DFT) calculations. The study revealed that solvent-shared ion pairs (SIPs) were dominant in dilute solutions, gradually transforming into CIPs as the concentration increased. As the concentration further increased, the CIP content decreased while the complexity of structures increased.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Environmental Sciences
Yeming Xu, Pai Liu, Shuaishuai Ma, Wenxiu Pei, Shufeng Pang, Yunhong Zhang
Summary: Understanding the efflorescence process of atmospheric aerosols is crucial for describing their phase transition dynamics. In this study, the efflorescence process of ammonium sulfate aerosol droplets mixed with water-soluble organic compounds (WSOCs) was investigated using ATR-FTIR spectroscopy. It was found that the addition of WSOCs lowers the characteristic efflorescence relative humidity, broadens the range, and reduces the crystallization ratio of the aerosol droplets. Sucrose and glycerol were observed to completely suppress crystallization at specific organic to inorganic ratios, suggesting the possibility of aerosols skipping efflorescence and transitioning into a glassy state at low humidity conditions.
ATMOSPHERIC ENVIRONMENT
(2022)
Article
Environmental Sciences
Na Wang, Yaxin Guo, Jiarong Li, Shufeng Pang, Yunhong Zhang
Summary: Water-soluble amino acids were found to play an important role in cloud condensation nuclei (CCN) material. The hygroscopic properties and phase states of ammonium nitrate (AN) mixed with glycine and alanine were investigated. The study revealed that amino acids could form mixed particles with AN and remain solid during hydration due to hydrogen bonding interaction.
ATMOSPHERIC ENVIRONMENT
(2022)
Article
Engineering, Environmental
Zhe Chen, Pai Liu, Weigang Wang, Xue Cao, Yu-Xin Liu, Yun-Hong Zhang, Maofa Ge
Summary: This study demonstrates that the uncatalyzed autoxidation of SO2 in aerosols, especially under high ionic strength and acidic conditions, can significantly accelerate the sulfate formation rate, which may contribute to the severe winter haze events in Beijing and North China Plain.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Lin-Fang Li, Zhe Chen, Pai Liu, Yun-Hong Zhang
Summary: Accurately measuring the pH of atmospheric aerosols is crucial for understanding their impact on the environment and climate. However, current studies are limited to static measurements and do not capture the dynamic changes during atmospheric aging. In this study, a new technique using silver nanoparticles and Raman spectroscopy is introduced for continuous in situ pH measurement of aerosols. The results show that the depletion of ammonium continuously acidifies aerosol water over time, and the pH decay can be described by a universal exponential function. The ammonium depletion reaction is found to be a self-limiting process. This technique provides insights into the dynamic changes of aerosol acidity during complex atmospheric aging processes.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Soil Science
Taiyan Yuan, Shuo Chen, Yunhong Zhang, Lingmei Ji, Biswanath Dari, Debjani Sihi, Dehua Xu, Zhiye Zhang, Zhengjuan Yan, Xinlong Wang
Summary: This study investigated the effects of APP and MAP on phosphorus transformation in a calcareous soil. The results showed that APP application significantly increased the extractable phosphorus in the soil and altered the distribution of phosphorus forms and microbial community structure. Soil pH was identified as a key factor in explaining these changes.
BIOLOGY AND FERTILITY OF SOILS
(2022)
Article
Environmental Sciences
Li Zhou, Ting Lei, Dongjuan Kang, Yucong Guo, Yunhong Zhang, Fumo Yang, Maofa Ge, Weigang Wang
Summary: Coal-derived fly ash is a major aerosol composition in the atmosphere. The heterogeneous uptake of hydrogen peroxide and sulfur dioxide on coal fly ash was studied, and the effects of temperature and mixing ratio on the uptake coefficients were analyzed. The presence of gaseous H2O2 appeared to enhance the ability of SO2 uptake on coal fly ash.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Chemistry, Analytical
Baokun Huang, Qiannan Zhao, Chenglin Sun, Lin Zhu, Hong Zhang, Yunhong Zhang, Cunming Liu, Fabing Li
Summary: In this study, a simple and effective method was developed to enhance the signal of spontaneous Raman scattering from gases and liquids. By utilizing the principle of an integrating sphere, multiple pass actions of low-energy pump light and the collection of all Raman scattered light were achieved. The experimental results showed that our setup can significantly improve the detection limit for liquids compared to confocal Raman scattering spectroscopy.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Analytical
Xinbo Jing, Zhe Chen, Qishen Huang, Pai Liu, Yun-Hong Zhang
Summary: This study reports a technique for high spatiotemporal resolution pH measurement in microdroplets using spontaneous Raman spectroscopy. The results show that chloride depletion in the microdroplets leads to a continuous increase in pH, while a stable pH gradient exists within a single droplet. This technique provides a new method for precise pH measurement in aerosols.
ANALYTICAL CHEMISTRY
(2022)
Review
Meteorology & Atmospheric Sciences
Tong Zhu, Mingjin Tang, Meng Gao, Xinhui Bi, Junji Cao, Huizheng Che, Jianmin Chen, Aijun Ding, Pingqing Fu, Jian Gao, Yang Gao, Maofa Ge, Xinlei Ge, Zhiwei Han, Hong He, Ru-Jin Huang, Xin Huang, Hong Liao, Cheng Liu, Huan Liu, Jianguo Liu, Shaw Chen Liu, Keding Lu, Qingxin Ma, Wei Nie, Min Shao, Yu Song, Yele Sun, Xiao Tang, Tao Wang, Tijian Wang, Weigang Wang, Xuemei Wang, Zifa Wang, Yan Yin, Qiang Zhang, Weijun Zhang, Yanlin Zhang, Yunhong Zhang, Yu Zhao, Mei Zheng, Bin Zhu, Jiang Zhu
Summary: In the past 25 years, atmospheric chemistry research in China has grown rapidly, focusing on the concept of air pollution complexity. Over 24,000 papers on air pollution, authored or co-authored by Chinese scientists, were published in 2021. This paper reviews representative studies on various aspects of atmospheric chemistry in China, providing a starting point for understanding the field. The advances discussed in this paper have established a theoretical framework for air pollution, supported effective air pollution control policies in China, and created opportunities for education and career development.
ADVANCES IN ATMOSPHERIC SCIENCES
(2023)
Article
Environmental Sciences
Wen-Xiu Pei, Shuai-Shuai Ma, Zhe Chen, Yue Zhu, Shu-Feng Pang, Yun-Hong Zhang
Summary: This study investigates the heterogeneous uptake of NO2 by sodium acetate droplets under different NO2 concentrations and relative humidity conditions using micro-FTIR. The results show that the uptake coefficient of sodium acetate droplets is influenced by relative humidity and the volatility of acetate esters. Additionally, nitrite formation is observed during the heterogeneous uptake process, providing a new pathway for atmospheric nitrogen cycling and secondary nitrite aerosol formation.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2023)
Article
Chemistry, Physical
Xinbo Jing, Zhe Chen, Xue Cao, Qishen Huang, Pai Liu, Yun-hong Zhang
Summary: Sulfate formation from SO2 during urban haze events in China is a complex process with the important contributions of regionally transported sea spray aerosols (SSAs) and transition-metal ions (TMI)-catalyzed reactions. The reaction kinetics of Mn2+-catalyzed SO2 oxidation in NaCl microdroplets were investigated, revealing a linear correlation between reaction rate and droplet radius. The saturation concentration for both Mn2+ and SO2 implied an upper limit for the SO2 uptake coefficient, which increased with high ionic strength but was constant at pH levels of 5 to 8. The uptake coefficient was significantly higher than that of the uncatalyzed autoxidation of SO2 and other mineral dust oxidation pathways.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Environmental Sciences
Xue Cao, Zhe Chen, Yu-Xin Liu, Xin-Bo Jing, Lin-Fang Li, Pai Liu, Yun-Hong Zhang
Summary: Sulfate aerosols are produced at a rapid rate in China's winter haze, and this is believed to be due to the heterogeneous conversion of SO2 in urban aerosols. A study conducted in levitated microdroplets has directly measured the Fe(III)-catalyzed SO2 conversion in aerosols and found that it is 2 to 3 decades faster than in bulk solutions. The reaction rate is proportional to the droplet surface area, indicating that the major reaction occurs at the air-water interface.
ENVIRONMENTAL SCIENCE-ATMOSPHERES
(2023)
Article
Environmental Sciences
Shuaishuai Ma, Qiong Li, Yunhong Zhang
Summary: In this study, the hygroscopic growth and chemical composition evolution of NaNO3 and DCAs mixtures were measured using ATR-FTIR and vacuum FTIR techniques. The results showed that the phase state of NaNO3, chemical composition, water activity, and HNO3 gas-phase diffusion play crucial roles in HNO3 release from nitrate and DCA mixtures.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
