Tonsil Actisil FF, a commercial bentonitic clay, promotes the formation of a series of electrophilic-aromatic-substitution products from para-methoxybenzyl acetate in carbon disulfide. The molecules obtained correspond to linear isomeric dimers, trimers, tetramers and a pentamer, according to their spectroscopic data. A clear indication of the title mechanistic pathway for the oligomerization growth was obtained from the analysis of a set of computational-chemistry calculations using the density-functional-theory level B3LYP/6-311++G(d,p). The corresponding conclusions were based on the computed dipole moments, the HOMO/LUMO distributions, and a natural-populations analysis of the studied molecules.
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http://dx.doi.org/10.3390/molecules16021761 | DOI Listing |
Sci Rep
December 2024
School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, 330013, Jiangxi, People's Republic of China.
Compared with simple formations, EPB (earth pressure balance) shield tunnelling in composite formations encounters severe problems with muck conditioning and require improved muck conditioning technology to fulfil expectations for continuous and efficient excavation. In the Nanchang Metro Line 4 Project, a water-rich sand-argillaceous siltstone composite formation is encountered. With a high moisture content and complex composite formation ratio, it is quite difficult to determine the optimum muck conditioning scheme, and thus, muck spewing accidents frequently occur during the tunnelling process.
View Article and Find Full Text PDFGels
December 2024
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China.
During deepwater drilling, the low mudline temperatures and narrow safe density window pose serious challenges to the safe and efficient performance of deepwater water-based drilling fluids. Low temperatures can lead to physical and chemical changes in the components of water-based drilling fluids and the behavior of low temperature gelation. As a coarse dispersion system, water-based drilling fluid has a complex composition of dispersed phase and dispersing medium.
View Article and Find Full Text PDFGels
November 2024
Departamento de Ingeniería Química, Universidad Nacional de Colombia Sede Manizales, Campus La Nubia, km 9 vía al Aeropuerto, Manizales 170003, Colombia.
The tanning industry is among the most environmentally harmful activities globally due to the pollution of lakes and rivers from its effluents. Hexavalent chromium, a metal in tannery effluents, has adverse effects on human health and ecosystems, requiring the development of removal techniques. This study assessed the efficacy of organobentonite/alginate hydrogel beads in removing Cr(VI) from a fixed-bed adsorption column system.
View Article and Find Full Text PDFYing Yong Sheng Tai Xue Bao
October 2024
School of Ecological Technology and Engineering, Shanghai Institute of Technology, Shanghai 201418, China.
Petroleum hydrocarbon pollutants in soil are challenging to biodegrade, negatively impacting plant growth as well as the metabolic activity and community structure of soil microorganisms. Microorganisms immobilized by seed carriers can synergistically contribute to the remediation of petroleum hydrocarbon-contaminated soil. We prepared a rape seed carrier with immobilized microorganism by seed coating (with a mixture of diatomaceous earth and bentonite as fillers) and microbial immobilization.
View Article and Find Full Text PDFInt J Biol Macromol
December 2024
Institute of Tissue Regeneration, Soonchunhyang University, Cheonan 31151, Republic of Korea; Department of Surgery, Soonchunhyang University Cheonan Hospital, Cheonan 31151, Republic of Korea. Electronic address:
Although hemostatic powders are commonly used in clinical and emergency settings, they frequently show poor absorption, raise cytotoxicity issues, and are not effective for fatal non-compressible bleeding. The purpose of this research is to create a self-gelling hemostatic powder based on chitosan, bentonite, and sodium polyacrylate (CBS) to improve the hemostatic effect. When liquid comes into contact with CBS powders, they can fuse and form a stable hydrogel in less than 30s.
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