Results 11 to 20 of about 1,187 (190)

Chemical Phase Analysis of Arsenic Ores—A Study on Selective Separation Conditions of Orpiment and Realgar [PDF]

Yankuang ceshi
As a rich symbiotic mineral resource, orpiment (As2S3) and realgar (AsS/As2S2/As4S4) are common sulfide minerals of arsenic. However，due to their similar chemical properties, the chemical phase analysis method of arsenic has always taken these two ...
Yani DONG, Ying XIONG, Ruohui PEI, Xiao ZHANG, Guangjin XIE, Changzheng CUI   +5 more
doaj   +2 more sources

Orpiment under compression: metavalent bonding at high pressure [PDF]

Physical Chemistry Chemical Physics, 2020
Orpiment (α-As2S3) under compression reports a strong change in the coordination of As atoms at 25 GPa, which can be ascribed to an isostructural phase transition. These changes are consistent with the formation of metavalent bonds in orpiment.
Vanesa Paula Cuenca-Gotor, Juan Ángel Sans, Oscar Gomis, Andres Mujica, Silvana Radescu, Alfonso Muñoz, Plácida Rodríguez-Hernández, Estelina Lora da Silva, Catalin Popescu, Jordi Ibañez, Rosario Vilaplana, Francisco Javier Manjón   +11 more
openaire   +8 more sources

Combined Micro- and Macro scale X-ray powder diffraction mapping of degraded Orpiment paint in a 17th century still life painting by Martinus Nellius

Heritage Science, 2019
The spontaneous chemical alteration of artists’ pigment materials may be caused by several degradation processes. Some of these are well known while others are still in need of more detailed investigation and documentation.
Jonas Simoen, Steven De Meyer, Frederik Vanmeert, Nouchka de Keyser, Ermanno Avranovich, Geert Van der Snickt, Annelies Van Loon, Katrien Keune, Koen Janssens   +8 more
doaj   +2 more sources

MULTI-INSTRUMENTAL IDENTIFICATION OF ORPIMENT IN ARCHAEOLOGICAL MORTUARY CONTEXTS [PDF]

Journal of the Chilean Chemical Society, 2014
This paper reports on an unknown yellowish mineral compound found in an archaeological context from Chorrillos cemetery (Calama, Chile) dating to the Early Formative period (800 - 200 B.C.). We used optic microscopy, SEM, EDX, ¹H-RMN, 13C-RMN, and infrared (IR) and Raman spectroscopy to tease out the chemical and molecular composition of the sample ...
Ugalde, J.P., Salas Sánchez, Cristián Osvaldo, Lara, N., Leyton, P., Paipa, C., Campos-Vallette, M., Arriaza, B.   +6 more
openaire   +5 more sources

Two Pathways for the Degradation of Orpiment Pigment (As₂S₃) Found in Paintings. [PDF]

J Am Chem Soc, 2023
Paintings are complex objects containing many different chemical compounds that can react over time. The degradation of arsenic sulfide pigments causes optical changes in paintings. The main degradation product was thought to be white arsenolite (As2O3),
Broers FTH, Janssens K, Nelson Weker J, Webb SM, Mehta A, Meirer F, Keune K.   +6 more
europepmc   +3 more sources

Pharmacology, Toxicology, and Therapeutics of Minerals in Traditional Medicine 2021. [PDF]

Evid Based Complement Alternat Med, 2023
Evidence-Based Complementary and Alternative Medicine, Volume 2023, Issue 1, 2023.
Liu J, Krishnan UM, Wei L.
europepmc   +2 more sources

Fast pH-Driven Solubilization Method of Realgar (As₄S₄) to Reduce the Toxicity of Arsenic [As(III)] for Medicinal Purposes. [PDF]

Adv Sci (Weinh)
Arsenic trioxide transformed acute promyelocytic leukemia therapy and shows promise against HIV. A new method to solubilize the mineral realgar produces different arsenic species depleting the main arsenic target, nuclear PML protein, and retaining effects on leukemic and HIV reservoir cells, while minimizing off‐target damage.
Lucic B, Franciscato DS, Nogueira HP, Gallucci L, Silveira Junior AT, Ismail AM, Robinson M, Dallinger T, Gutfleisch C, Kurz J, Toledo M, Dias da Silva Ferraz J, Tarek M, Dias D, Diaz RS, ElHefnawi M, Forcato M, Monteiro HP, Lusic M, Shytaj IL, Savarino A.   +20 more
europepmc   +2 more sources

Can Napoleon's skin disease and treatment be identified from paleoproteomic analyses of his last bathtub (1821)? [PDF]

J Eur Acad Dermatol Venereol
Journal of the European Academy of Dermatology and Venereology, Volume 39, Issue 8, Page 1382-1384, August 2025.
Charlier P, Armengaud J, Poupon J, Deo S, Astier A.   +4 more
europepmc   +2 more sources

Purification, Detoxification, and Incineration Methods of Minerals and Metals in Traditional Medicine Formulations of Sri Lanka. [PDF]

Evid Based Complement Alternat Med, 2021
Background. Herbo‐mineral therapies are very popular in traditional medical systems and formulations consisting of specific minerals or metals or mixture of both and mixed with organic components derived from plants. Purification/detoxification or incineration procedures play an important role to detoxify these and metals and minerals. Objective.
Sujatha Pushpakanthi Hewageegana HG, Hewageegana AU, Ashanthi Menuka Arawwawala LD.   +2 more
europepmc   +2 more sources

Revisiting the Nature of Chemical Bonding in Chalcogenides to Explain and Design their Properties

Advanced Materials, Volume 35, Issue 20, May 18, 2023., 2023
Quantum chemical bonding descriptors enable a quantitative description of bonding in chalcogenides. These descriptors are employed as property predictors for optical and transport properties. Hence, they can be utilized to tailor thermoelectrics, photovoltaics, and phase‐change memories. Their unusual property portfolio is attributed to a novel bonding
Matthias Wuttig, Carl‐Friedrich Schön, Jakob Lötfering, Pavlo Golub, Carlo Gatti, Jean‐Yves Raty   +5 more
wiley   +1 more source