Results 81 to 90 of about 92,049 (241)

Unveiling the Secret Chemistry of Street Art by a Multitechnique Approach

ChemPlusChem, EarlyView.
Two murals created in 2021 in Bari, Italy, have been analyzed by attenuated total reflection Fourier‐transform infrared spectroscopy, reversed‐phase liquid chromatography coupled with UV‐Vis and electrospray ionization mass spectrometry (MS), laser desorption ionization MS, pyrolysis–gas chromatography/MS.
Elena C. L. Rigante, Francesca Modugno, Jacopo La Nasa, Silvia Pizzimenti, Tommaso R. I. Cataldi, Cosima D. Calvano   +5 more
wiley   +1 more source

Percolative conductivity in alkaline earth silicate melts and glasses

, 2003
Ion conducting $(CaO)_x(SiO_2)_{1-x}$ glasses and melts show a threshold behaviour in dc conductivity near $x=x_t=0.50$, with conductivities increasing linearly at $x>x_t$.
Belashenko D. K., Boolchand P., Boolchand P., F Chaimbault, Kim S. S., M Malki, M Micoulaut, Malki M., Malki M., Martin S. W., McMillan P., P Simon, Pauling L., Pauling L., Ravaine D., Stebbins J. F., Thorpe M. F., Y Vaills   +17 more
core   +1 more source

Using the HClO4–H2O2 System for Efficient Platinum Leaching: Optimal Conditions and Kinetics

ChemPlusChem, EarlyView.
GA: The platinum leaching using HClO4 and H2O2 is studied. For each HClO4 concentration, an H2O2/HClO4 = 2.5 ratio optimizes the kinetics. The best operating conditions are ≈70 °C, [HClO4] 3 m, and [H2O2] 7.2 m. The leaching process is governed by diffusion in the boundary layer and chemical reaction. In this new extraction process, Cl2(g) is generated
Anailda Alvarado‐Gómez, Roberto Pérez‐Garibay, Juan Carlos Fuentes‐Aceituno, Ramón Arellano‐Piña, Daniel Mendieta‐Georges   +4 more
wiley   +1 more source

Rethinking Chlorine: Essential Chemical or Replaceable Risk?

ChemSusChem, EarlyView.
Chlorine is essential for the production of plastics and pharmaceuticals but poses significant safety and environmental risks. Herein, processes are presented that substitute chlorine or reduce its demand. Where indispensable, trichloride‐ and bichloride‐based ionic liquids could enhance safety and streamline the integration of renewable energy ...
Johannes Schwan, Merlin Kleoff, Gesa H. Dreyhsig, Patrick Voßnacker, Traute Fiedler, Marian Rosental, Sebastian Riedel   +6 more
wiley   +1 more source

Valorisation of Greenhouse Gas for Commodity Chemical Production–Nitrous Oxide as Oxidising Agent for Heterogeneous Catalysis

ChemSusChem, EarlyView.
Heterogeneous catalysts can enhance the selectivity of oxidation reactions using N2O as oxidizing Agent with proper modification of catalyst phase, surface area, and acidity. N₂O activation leads to generating reactive oxygen species, facilitating selective oxidation and dehydrogenation to produce various products such as oxygenates, hydrocarbons, and ...
Seonho Lee, Seong‐Jik Park, Jechan Lee
wiley   +1 more source

Effects of elevated ground temperatures on properties of cement grouts for deep rock grouting

Deep Underground Science and Engineering, EarlyView.
When the temperature is up to 35°C, significant improvement in rheological parameters, acceleration of grout setting, and an increase in the rheological time dependence of thick cement grout can occur, but there may be a slight effect on the initial grout flowability and the nature of shear thinning.
Zhipeng Xu, Jianping Sun, Runguo Li, Lei He, Changwu Liu   +4 more
wiley   +1 more source

Effect of Additives on Mineral Trioxide Aggregate Setting Reaction Product Formation [PDF]

, 2015
Introduction Mineral trioxide aggregate (MTA) sets via hydration of calcium silicates to yield calcium silicate hydrates and calcium hydroxide (Ca[OH]2). However, a drawback of MTA is its long setting time.
Berzins, David W., Chedella, Sharath C.V., Zapf, Angela M.   +2 more
core   +1 more source

Petrogenetic and geochemical characteristics of some auriferous granitoids in the Kumasi Basin, Ghana: Implications for geodynamic settings and controls of orogenic gold mineralization in the Edikan Gold Mine

Deep Underground Science and Engineering, EarlyView.
The Fobinso granitoids are granodiorites, while the Esuajah granitoids are granites based on their mineralogical composition. The granitoids are generally enriched in LILE and LREE than HFSE, MREE, and HREE, indicating mixing with crustal sources during their evolution.
Emmanuel D. Sunkari, Obed Oppong, Theophilus K. Agbenyezi   +2 more
wiley   +1 more source

Field investigation of grout propagation within a caving mass under flowing water conditions in a metal mine

Deep Underground Science and Engineering, EarlyView.
This study investigated the characteristics of two‐liquid slurry propagation filling of underground concealed spaces under flowing water conditions in metal mines using on‐site engineering tests. We proposed four different grout stratigraphic classifications, investigated four main factors affecting grout propagation, and summarized five different ...
Baofu Wu, Guilei Han, Zhiqi Wang, Jiabin Shi, Hongjiang You, Asrullah   +5 more
wiley   +1 more source

Gels for CO2 geo‐storage and conformance control: A systemic review of behavior and performance

Deep Underground Science and Engineering, EarlyView.
This review provides a systemic evaluation of potential sealants used in CO2 subsurface storage practices. Critical analyses of how external factors like CO2, pH, brine salinity and hardness, rock mineralogy, pressure, temperature, and injectivity could affect the performance of different sealants are provided. Abstract Carbon capture and storage (CCS)
Funsho Afolabi, Iskandar Dzulkarnain, Sunil Kwon, Dmitriy A. Martyushev, Jang H. Lee, Shiferaw R. Jufar, Fahd Al‐Akbari   +6 more
wiley   +1 more source