Article
Materials Science, Multidisciplinary
Artur S. C. Rego, Carolina V. B. Marprates, Talita S. X. Silva, Joao G. Neto, Rogerio C. S. Navarro, Rodrigo F. M. Souza, Eduardo A. Brocchi
Summary: This study proposed two different approaches for kinetic modeling of sulfate thermal decomposition: a graphical method (sigmoid) and a stochastic method (particle swarm optimization - PSO). It was found that the presence of potassium sulfate decreased the decomposition temperature of aluminum sulfate, and while the results of both methods agreed to a certain extent, they did not provide the same values. The determined apparent orders and activation energies varied between the two methods, with the mixture of sulfates showing the lowest activation energy values and pure aluminum sulfate having the highest.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Organic
Jyun-Siao Chen, Kai-Min Zhang, Yi-Fan Ke, Hsiao-Lin Hsu, De-Cian Liou, Ching-Hsien Chen, Chia-Yang Kou, Wei-Chung Yen, Hsin-Ru Wu, Chien-Sheng Chen, Shun-Yuan Luo
Summary: This study aimed to optimize the per-O-acetylation, deacetylation, and benzylidene protection of carbohydrates and investigate the scope of saccharides via alum-catalysis. The study offers insights into optimizing these reactions and proposes a plausible reaction mechanism for the observed isomerization in galactose and xylose after acetylation.
ASIAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Agricultural Engineering
Chayanon Chotirotsukon, Sadat Mohamed Rezk Khattab, Naoko Kobayashi, Masato Katahira, Navadol Laosiripojana, Verawat Champreda, Takashi Watanabe
Summary: This study reports a green and efficient method for the pretreatment and fractionation of sugarcane trash, using microwave-accelerated glycerolysis and the addition of alum and sodium hydroxide to improve lignin solubilization and sugar yield. The spent liquor can be further converted into ethanol. The results suggest the potential application of this method in biorefineries.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Thermodynamics
Rongchun Li, Jipeng Luo, Huimin Yan, Hui Zheng, Rongmin Wei, Min Yang, Xiangling Gu, Zhicheng Tan, Quan Shi
Summary: In this study, two metal-organic coordination compounds were designed and synthesized, and their magnetic susceptibilities and heat capacities were measured, revealing anti-ferromagnetic interaction and Schottky effect in the compounds. The obtained thermodynamic properties provide a significant basis for further investigating the functional properties of these compounds.
THERMOCHIMICA ACTA
(2021)
Article
Multidisciplinary Sciences
Nanik Wijayati, Lulua Romjanah Lestari, Lisa Ayuningtyas Wulandari, F. Widhi Mahatmanti, Senda Kartika Rakainsa, Edi Cahyono, Roswanira Abdul Wahab
Summary: This study investigated the use of potassium alum as a catalyst in the methoxylation of alpha-pinene, finding optimal reaction conditions for high selectivity. The results demonstrate the effectiveness of potassium alum in catalyzing the methoxylation of a-pinene to produce commercially important ethers.
Article
Chemistry, Physical
Rongda Ye, Jun Wang, Yanna Li, Wanchun Sun, Qizhang Huang, Sheng Gong, Xugang Shu
Summary: A series of eutectic hydrated salts were prepared by mixing Na2HPO4•12H2O and K2HPO4•3H2O, and it was found that adding appropriate deionized water improved their thermal properties; using SiO2 as support, the maximum content of eutectic hydrated salts in composite PCM reached 70%; the addition of nucleating agent in composite PCM reduced supercooling and enhanced material stability.
Article
Materials Science, Ceramics
Ahmed Souemti, Islem Labidi, Adel Megriche
Summary: Anhydrous alpha-alum materials doped with different amounts of samarium oxide were prepared and studied. The doping level affected the lattice parameters and conductivity. Different electronic transitions and quenching phenomenon were observed.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Chemical
Ippei Tsushima, Kouji Maeda, Takuji Yamamoto, Kazuhiro Ito, Koji Arafune, Syogo Taguchi, Hideo Miki
Summary: Continuous crystallization of potassium aluminum sulfate dodecahydrate via indirect cooling was conducted using a draft tube-type crystallizer with a circulation flow path. The degree of supersaturation in the circulation channel was monitored using a newly designed system. The crystal growth rates calculated by the population balance model and the supersaturation monitor showed slight differences but were close. This system has potential applications in industrial crystallization with impurities.
CHEMICAL ENGINEERING & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Weicheng Chen, Xianghui Liang, Wanhui Han, Shuangfeng Wang, Xuenong Gao, Zhengguo Zhang, Yutang Fang
Summary: In this study, a novel 3D shape-stable temperature-regulated macro-encapsulated phase change material (PCM) was successfully prepared by borrowing and improving the structure of micro-encapsulated PCMs. The obtained PCM exhibited high enthalpy, appropriate phase transition temperature, and suppressed supercooling, along with excellent sealing effect and thermal insulation performance. This new type of PCM has significant application potential in thermal energy storage systems and provides a new method for the preparation of macro-encapsulated PCMs.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Geochemistry & Geophysics
Anatoly N. Sapozhnikov, Vladimir L. Tauson, Sergey Lipko, Roman Yu Shendrik, Valery Levitskii, Lyudmila F. Suvorova, Nikita Chukanov, Marina F. Vigasina
Summary: The analysis of dark blue lazurite from the Malo-Bystrinskoe lazurite deposit in Russia revealed an exceptionally high content of total sulfur. The lazurite formula was determined to include various elements and compounds, such as Na, Ca, K, Al, Si, O, SO4, S, and Cl. Lazurite is considered to be an effective sensor for trisulfur radical anions and may be used to estimate the fugacity of SO2 and O-2 in metasomatic systems.
AMERICAN MINERALOGIST
(2021)
Article
Geochemistry & Geophysics
Anatoly N. Sapozhnikov, Vladimir L. Tauson, Sergey Lipko, Roman Yu Shendrik, Valery Levitskii, Lyudmila F. Suvorova, Nikita Chukanov, Marina F. Vigasina
Summary: The study analyzed dark blue lazurite from the Malo-Bystrinskoe lazurite deposit in Eastern Siberia, Russia, revealing its high sulfur content and chemical composition. Through various analytical methods, the idealized formula and structural characteristics of lazurite were determined. The mineral is believed to potentially serve as a sulfur sensor, allowing for the study of sulfur radical anions in different conditions.
AMERICAN MINERALOGIST
(2021)
Article
Biochemistry & Molecular Biology
Ana Amic, Denisa Mastil'ak Cagardova
Summary: This study theoretically examined the inactivation potency of quercetin and flavonoid catecholic metabolites 1-5 on HOO center dot, CH3OO center dot, and O-2(center dot-) under physiological conditions. The results showed that the catecholic moiety of quercetin and metabolites 1-5 played a crucial role in scavenging HOO center dot and CH3OO center dot. Metabolites 1 and 5 were identified as the most potent scavengers of HOO center dot and CH3OO center dot, respectively. Quercetin exhibited higher potency in inactivating HOO center dot and CH3OO center dot via single electron transfer. The SET reaction from the 3-O-phenoxide anion of quercetin represented the most contributing reaction path. Furthermore, all polyphenolic compounds studied showed potency in inactivating O-2(center dot-) through a concerted two-proton-coupled electron transfer mechanism. These findings suggest that metabolites with high radical scavenging potency and enhanced bioavailability may contribute to the health-promoting effects attributed to parent molecules.
Article
Biophysics
Hui Wang, Cuifang Liu, Xiaoting Zhang, Tiancong Xiu, Ping Li, Wei Zhang, Wen Zhang, Xin Wang, Zhenzhen Liu, Bo Tang
Summary: Investigating the use of a fluorescence probe to detect increased Golgi ROS levels in hypertensive mice, evaluating the efficacy of antihypertensive drugs, and identifying ROS post-transcriptional modification sites on dihydrofolate reductase. This suggests a new therapeutic target for hypertension and the development of new antihypertensive drugs.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Chemistry, Physical
Kevin J. Pastoor, Andrew J. Miskowiec, Jennifer L. Niedziela, Jonathan H. Christian, Bryan J. Foley, Sara B. Isbill, Ashley E. Shields, Alicia M. Manjon-Sanz, Erik C. Nykwest, Tyler L. Spano, Matthew S. Wellons, Jenifer C. Shafer, Mark P. Jensen
Summary: This study investigated the structure of uranium tetrafluoride hydrate (UF4·2.5H2O) using time-of-flight neutron powder diffraction. The crystal structure of UF4·2.5H2O exhibits three distinct water environments, with extensive hydrogen bonding between water molecules and fluoride ligands. Thermal analysis showed that UF4·2.5H2O is thermally stable up to certain temperatures and undergoes dehydration at higher temperatures.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Idia Msaadi, Ali Rayes, Monica Benito, Noureddine Issaoui, Elies Molins, Brahim Ayed
Summary: Two novel organic-inorganic decavanadate materials with protonated amines were prepared and characterized by X-Ray diffraction, thermogravimetric analysis and IR spectroscopy. The crystal packing of both compounds is governed by non-covalent intermolecular forces, with important contributions from O-H and H-H bonds. The photoluminescence properties and UV-Vis absorption spectra indicate that both compounds exhibit blue and green emissions upon violet light irradiation.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
