Article
Chemistry, Physical
Lukasz Kotyrba, Anna Chrobok, Agnieszka Siewniak
Summary: This paper reviews recent literature findings on the development of propylene carbonate synthetic methods, starting from propane-1,2-diol and urea. The ammonia generated during synthesis is recycled to obtain urea from carbon dioxide.
Article
Engineering, Chemical
Chengwei Liu, Ziyi Chi, Yong Yan, Zhenyang Lu, Xue-Gang Li, Jian-Min Yan, Man Luo, Wende Xiao
Summary: This study investigates the tunable transesterification of dimethyl carbonate (DMC) with ethanol to synthesize ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) using a solid alkaline catalyst. The catalyst displayed high activity for the reaction, with the selectivities of EMC and DEC being tunable by adjusting the space velocity and feed ratio. The findings contribute to the development of co-solvents for electrolytes in lithium-ion batteries.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Bo Jia, Xiaoyu Sun, Ming Chen, Jian Jian, Kuiyi You, He'an Luo, Yangqiang Huang, Xiao Luo, Bo Jin, Nailiang Wang, Zhiwu Liang
Summary: This paper evaluates an optimal composite metal oxide ZnAl-LDO catalyst, prepared from Zn/Al layered double hydroxides (ZnAl-LDHs), for the synthesis of dimethyl carbonate (DMC) through methyl carbamate (MC) alcoholysis. The catalyst achieved high selectivity for DMC production under optimal conditions and its catalytic performance was investigated through structural characteristics, kinetic modeling, and thermodynamic calculations.
REACTION CHEMISTRY & ENGINEERING
(2021)
Article
Polymer Science
Haotian Zhang, Mingxin Niu, Qi Zhang, Haoyu Fan, Chenyang Hu, Xuan Pang
Summary: In this study, a new method for synthesizing fully N-substituted polyureas was reported, which involved the catalyst-free ring-opening copolymerization of aziridines and isocyanates. The fully N-pendent functionality on polyureas was achieved for the first time, with the substitution exhibiting a non-symmetric pattern. Various N-alkyl aziridines were successfully used to form polyureas when combined with p-tosyl isocyanate, allowing for facile variation of the non-symmetric N-substitutions. The synthesized non-symmetric N-substituted polyureas possessed cyclic topologies, and the copolymerization was proposed to proceed via a zwitterionic mechanism. These findings have important implications for the development of novel functional materials based on N-substituted polyureas.
Article
Chemistry, Applied
Konstantin A. Milakin, Udit Acharya, Islam M. Minisy, Doebner Von Tumacder, Zuzana Moravkova, Oumayma Taboubi, Tomas Syrovy, Lucie Syrova, Jiri Pfleger, Patrycja Bober
Summary: Colloidal dispersions of protonated polyaniline were prepared with the presence of phytic acid, leading to larger particle size and better long-term stability. The coatings exhibit different surface properties that can be useful for electrochemical applications.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Energy & Fuels
Sibel Yazar, Melih Besir Arvas, Sila Melahat Yilmaz, Yucel Sahin
Summary: In this study, phthalic acid and 2,3-pyrazinedicarboxylic acid doped polyaniline (PANI) were synthesized using a simple hydrothermal method, and the effect of the carboxylic acid groups and pyrazine moiety on the energy storage properties of PANI was investigated. The results showed that 2,3-pyrazinedicarboxylic acid improved the specific capacitance of PANI, and the ratio of 2,3-pyrazinedicarboxylic acid affected its charge storage properties.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Chemistry, Physical
I. Tyrone Ghampson, Sean-Thomas B. Lundin, Tetsuya Shishido, S. Ted Oyama
Summary: The direct partial oxidation of CH4 to dimethyl ether (DME) was achieved using a Pt/Y2O3 catalyst with a mixture of NO and O-2, where the NO/NO2 mixture acted as a single oxygen atom shuttle, with no decomposition or net consumption of these species.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Chemical
Yuki Ueda, Shintaro Morisada, Hidetaka Kawakita, Marco Wenzel, Jan J. Weigand, Keisuke Ohto
Summary: A new extractant, 1-butyl-3-(2-ethylhexyl)urea (L), was studied for its efficient extraction of [PtCl6](2-) from HCl solutions, showing high selectivity and revealing the mechanism of extraction and changes in water content after extraction.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Wei Chen, Leitao Xu, Xiaorong Zhu, Yu-Cheng Huang, Wang Zhou, Dongdong Wang, Yangyang Zhou, Shiqian Du, Qiling Li, Chao Xie, Li Tao, Chung-Li Dong, Jilei Liu, Yanyong Wang, Ru Chen, Hui Su, Chen Chen, Yuqin Zou, Yafei Li, Qinghua Liu, Shuangyin Wang
Summary: This study delves into the crucial role of nitrogenous nucleophile electrooxidation reaction (NOR) in the degradation and transformation of available nitrogen, particularly focusing on the transformation mechanism mediated by the beta-Ni(OH)(2) electrode. The study proposes the role of proton-coupled electron transfer (PCET) in bridging the electrocatalytic dehydrogenation and spontaneous nucleophile dehydrogenative oxidation reaction, with a specific focus on the urea oxidation reaction (UOR). Through both operando tracing and theoretical calculations, a mechanism for UOR involving intramolecular coupling of the N-N bond, accompanied by PCET, hydration, and rearrangement processes, is proposed to achieve high performance and approximately 100% N-2 selectivity. These findings shed light on the evolution of nitrogenous molecules during NOR, as well as fundamental aspects of electrocatalysis involving nitrogen-containing species.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Genetics & Heredity
Hanne Honerlagen, Henry Reyer, Michael Oster, Siriluck Ponsuksili, Nares Trakooljul, Bjorn Kuhla, Norbert Reinsch, Klaus Wimmers
Summary: Nitrogen excreted by dairy cows contributes to environmental eutrophication. Genetic variation in milk urea and other N-excretory metabolites can be mapped to specific genomic regions, providing insights into regulating nitrogen metabolism in dairy cows.
FRONTIERS IN GENETICS
(2021)
Article
Chemistry, Physical
Toshiaki Hanaoka, Masaru Aoyagi, Yusuke Edashige
Summary: The study investigated zeolite catalysts for efficient synthesis of n-butene in the DME-to-olefin reaction, finding that ferrierite zeolite with NH4+ cation exhibited the highest yield. The effect of calcination temperature on catalytic performance was studied, revealing that ferrierite zeolite showed the highest n-butene yield at 773 K. Multiple regression analysis showed the significant contribution of strong acid site and micropore volume to n-butene yield.
Article
Nanoscience & Nanotechnology
Qiaoyun Cheng, Qihua Li, Zhanhong Yuan, Shufen Li, John H. Xin, Dongdong Ye
Summary: Through a green approach, regenerated cellulose fibers with nanostructured pores were designed and manufactured, showing potential in improving water pollution treatment efficiency through the combination of nanotechnologies, demonstrating their potential in catalytic and bactericidal applications.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Xin He, Xin Wen, Ke Wu, Haichao Liu
Summary: A novel route for the sustainable synthesis of Vinyl Methyl Ether (VME) from biomass-derived ethylene glycol dimethyl ether (EGDE) catalyzed by CaO-MgO catalyst at atmospheric pressure has been reported. The strongly basic sites on CaO-MgO surfaces facilitated the formation of VME, achieving high efficiency and stability. This work provides a viable and sustainable strategy for the synthesis of VME and other high-value vinyl compounds from biomass.
Article
Chemistry, Analytical
Mart Vaartnou, Enn Lust
Summary: The adsorption of I- anions on the Bi(1 1 1) single crystal plane from mixed solutions of propylene carbonate and dimethyl carbonate has been investigated. The Gibbs energy of I- anions adsorption has been calculated using the virial adsorption isotherm. The results show that the adsorption of I- anions in the mixture is slightly lower than in the pure propylene carbonate or ethylene carbonate solutions.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Metallurgy & Metallurgical Engineering
Xiaojing Wei, Jue Wang, Xin Shi, Feng Zhou, Duolong Gao, Xiaohu Wen, Xiankang Zhong
Summary: The study aims to find a highly efficient corrosion inhibitor for 45# steel in hydrochloric acid solution and elucidate the mechanism of inhibitors. Results show that didecyl dimethyl ammonium chloride (DDAC), especially in combination with dodecane phenol polyoxyethylene, can provide good protection for carbon steel in hydrochloric acid, with the N atoms and long alkyl chains in DDAC playing a vital role.
ANTI-CORROSION METHODS AND MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Shiv Dutta Lawaniya, Nisha Meena, Sanjay Kumar, Yeon-Tae Yu, Kamlendra Awasthi
Summary: We investigated the gas sensing properties of nanocomposites of polypyrrole (PPy) and multiwalled carbon nanotubes (MWCNTs) synthesized using ex situ and in situ polymerization techniques. The MWCNTs were well dispersed in the PPy matrix prepared via in situ technique. The in situ prepared PPy-MWCNT composite showed superior sensing performance towards NH3 with high response, short response/recovery time, good selectivity, and repeatability.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Analytical
Sanjay Kumar, Shiv Dutta Lawaniya, Sonalika Agarwal, Yeon-Tae Yu, Srinivasa Rao Nelamarri, Manoj Kumar, Yogendra Kumar Mishra, Kamlendra Awasthi
Summary: The aim of this research is to develop a highly selective and stable H2 gas sensor using pure ZnO and Pt nanoparticles loaded ZnO pencil-like micro-structures. The microstructures were synthesized using the hydrothermal route and characterized using various techniques. The hydrogen sensing properties were examined, and the optimal concentration of 1 at% Pt loaded ZnO microstructures showed a highly selective response at a reduced working temperature of 150 degrees Celsius.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Engineering, Electrical & Electronic
Yuvika Sood, Harish Mudila, Akash Katoch, P. E. Lokhande, Deepak Kumar, Ajit Sharma, Anil Kumar
Summary: Two types of polypyrrole (PPy) were synthesized using different oxidizing agents, namely ammonium peroxydisulfate (APS) and ferric chloride (FeCl3), through a chemical oxidative approach. The electrical resistivity and morphology of the synthesized polymers were examined using a two-probe technique and scanning electron microscopy (SEM) respectively. X-ray diffractometry techniques were employed to determine the crystalline or amorphous structure of the polymers. Thermogravimetric analysis in a nitrogen atmosphere indicated the thermal stability of the prepared polymers. It was observed that the PPy prepared with FeCl3 exhibited higher conductivity of 2.22 x 10(-4) S/cm compared to the conductivity of APS at 0.16 x 10(-4) S/cm. Additionally, 1 M concentration of the monomer and 2 M concentration of FeCl3 demonstrated higher thermal stability compared to APS.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Analytical
Shiv Dutta Lawaniya, Sanjay Kumar, Yeontae Yu, Kamlendra Awasthi
Summary: In this study, we developed a eco-friendly and one-step method to synthesize hierarchical polypyrrole (PPy) nanotubes assembled urchins and flower-like nanostructures, and examined their morphology-dependent gas sensing properties. The PPy urchins and flower-like nanostructures showed high surface area and porous structure, resulting in great response, repeatability, and long-term durability to ammonia gas. Furthermore, the proposed flexible gas sensor demonstrated high mechanical robustness and remarkable performance for ammonia detection at room temperature, indicating its potential for wearable electronics applications.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Materials Science, Multidisciplinary
Shiv Dutta Lawaniya, Sanjay Kumar, Yeontae Yu, Kamlendra Awasthi
Summary: We present a flexible and room temperature ammonia sensor using polypyrrole/functionalized multiwalled carbon nanotubes (Ppy/f-MWCNTs). The nanocomposite was synthesized by in-situ chemical oxidative polymerization and loaded on a transparent poly(vinylidene fluoride) (PVDF) membrane substrate. The flexible sensor fabrication process was cost-effective and easy to operate. The optimized Ppy/f-MWCNT-based sensor showed improved sensing characteristics and high response toward ammonia, with good repeatability and long-term stability. This flexible sensor could be applied in wearable devices to detect ammonia in the ambient environment.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Shiv Dutta Lawaniya, Sanjay Kumar, Yeontae Yu, Horst-Gunter Rubahn, Yogendra Kumar Mishra, Kamlendra Awasthi
Summary: Flexible gas sensors have gained significant attention in recent years due to their wide applications in wearable electronics for environmental protection, food quality measurement, and health supervision. The low cost, easy-to-use, and real-time monitoring of harmful gases have driven the rapid development of flexible gas sensors. This review article discusses the utilization of nanomaterials in fabricating flexible gas sensors, including the characterization of functional materials based on their physical and chemical properties. The article also provides a detailed analysis of the characteristics of flexible gas sensors, such as sensitivity, selectivity, response time, operating temperature, and flexibility. The future scope of development, including morphology modification, functionalization, and size alteration, is summarized based on the current status.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Engineering, Chemical
Poonam Kumari, Kumud Malika Tripathi, Kamlendra Awasthi, Ragini Gupta
Summary: In light of accelerated industrialization and the crisis of clean water, the treatment of wastewater, particularly the elimination of nitrophenols, is significant. In this study, low-cost and green carbon nano-onions (CNOs) synthesized from low-quality flaxseed oil showed high efficiency in removing nitrophenols from contaminated water. The adsorption of nitrophenols onto CNOs followed a Langmuir adsorption isotherm and pseudo-second-order kinetics, and the process was found to be spontaneous and exothermic. Furthermore, the CNOs demonstrated good recyclability and easy separation, making them highly applicable in wastewater treatment.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Applied
Devandar Chauhan, Prashant Kumar Nagar, Kamakshi Pandey, Kamlendra Awasthi, Harsh Pandey
Summary: This review article summarizes literature on simulations of physically surface-patterned membranes and discusses the various factors affecting their anti-fouling performance, including membrane dimensions, fluid flow velocity and direction, particle size, and pattern size. The review concludes that the pattern dimensions have the most significant influence on the anti-fouling performance.
SEPARATION AND PURIFICATION REVIEWS
(2023)
Article
Nanoscience & Nanotechnology
Sanjay Kumar, Shiv Dutta Lawaniya, Srinivasa Rao Nelamarri, Manoj Kumar, Prabhat K. Dwivedi, Yogendra Kumar Mishra, Kamlendra Awasthi
Summary: Zinc oxide nanosheets are synthesized using a simple solvothermal route and decorated with pre-synthesized Ag-Pt nanoparticles to develop a selective ethanol gas sensor that operates at a relatively lower temperature. The characterization of the produced nanostructures is carried out using various techniques to investigate their topography, structure, and elemental composition. The nanostructures are then utilized to fabricate gas sensor devices and evaluate the ethanol gas sensing capabilities, optimizing the synergistic effect of Ag and Pt concentrations in Ag-Pt bimetallic nanoparticles.
ACS APPLIED NANO MATERIALS
(2023)
Article
Environmental Sciences
Poonam Kumari, Prashant Upadhyay, Kumud Malika Tripathi, Ragini Gupta, Vaibhav Kulshrestha, Kamlendra Awasthi
Summary: In this study, carbon nano onions (CNO)-based sulphonated poly(ethersulfone) (SPES) composite membranes were synthesized for water desalination by varying CNO content in the SPES matrix. The physico- and electrochemical properties of the nanocomposite membranes were evaluated and compared to pristine SPES. The integration of CNO nanoparticles into the SPES matrix enhanced the ion-conducting channels, resulting in improved water uptake, ion exchange membrane, and ionic conductivity values.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Ankush Agrawal, Ruhani Sharma, Ankita Sharma, Kailash Chand Gurjar, Sanjay Kumar, Samit Chatterjee, Harsh Pandey, Kamlendra Awasthi, Anjali Awasthi
Summary: In this study, green synthesized zinc oxide nanoparticles (ZnO NPs) were found to exhibit excellent antibacterial and antibiofilm activity against biofilm-producing Bacillus subtilis bacteria. The nanoparticles were shown to inhibit biofilm formation and damage bacterial cell membranes, indicating their potential as an alternative treatment for biofilms and drug-resistant bacteria.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Poonam Kumari, Kumud Malika Tripathi, Kamlendra Awasthi, Ragini Gupta
Summary: In this study, biomass-derived carbon nano-onions (CNOs) were explored for the first time as adsorbents for organic pollutants and oils in water. The as-synthesized CNOs showed high adsorption efficiency in removing organic solvents and oils without any surface modification. The CNOs can be reused for more than 5 cycles by simple evaporation. Therefore, CNOs have promising potential for the treatment of oil-polluted water.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Physical
Hem Kanwar Rathore, Muruganandham Hariram, Mukhesh K. Ganesha, Ashutosh K. Singh, Debanjan Das, Manoj Kumar, Kamlendra Awasthi, Debasish Sarkar
Summary: In this study, an all pseudocapacitive asymmetric supercapacitor (ASC) was fabricated using a N-doped V4C3/C nano-heterostructure as the negative electrode and a VO2/VSe2 hybrid composite as the positive electrode material. The ASC exhibited a high specific capacitance, outstanding rate capability, and good cycling stability. It displayed a stable voltage window and high energy/power densities, surpassing many aqueous-based supercapacitors. This research substantiates the potential of vanadium-based materials for high-performance electrochemical energy storage systems.
SUSTAINABLE ENERGY & FUELS
(2023)
Article
Chemistry, Physical
Gaurav Pandey, Shiv Dutta Lawaniya, Sanjay Kumar, Prabhat K. Dwivedi, Kamlendra Awasthi
Summary: The increasing demand for hydrogen worldwide emphasizes the importance of advanced detection technologies. A highly sensitive hydrogen gas sensor based on SnO2 nanorods decorated with bimetallic (Pd-Au) alloy nanoparticles has been constructed and shows excellent gas sensing capabilities and high selectivity.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)