Results 51 to 60 of about 4,430 (207)
Journal of Raman Spectroscopy, EarlyView.Micrometer analysis of millimeter lines of Raman spectra concludes in the association of anatase and graphitized organic matter (graphogen). The photosynthetic microorganisms at the origin of the microbialites produce O2, which is transformed by TiO2 into reactive species that, in turn, decompose the organic matter of the microorganisms. ABSTRACT Raman
Marie‐Paule Bassez
wiley +1 more source
Experimental investigation of calcium carbonate mineralogy in past and future oceans [PDF]
, 2011 Inorganic marine calcium carbonate formation and mineralogy varies significantly concurrent with the solution composition. During the Phanerozoic, due to oscillations in the seawater composition, this resulted in the formation of either dominantly ...
Bots, Pieter
core
Polymer Engineering &Science, Volume 66, Issue 6, Page 4247-4260, June 2026.ABSTRACT This study investigated the effects of incorporating ionomer scraps and CaCO3 nanoparticles on the rheological, mechanical, thermal, and morphological properties of neat polyamide 6 (PA6) and a PA6/ionomer scraps (80/20) blend. The ionomer formed an immiscible dispersed phase within the PA6, acting as an impact modifier; however, it reduced ...
Roberto Alves Taveira Jr. +2 more
wiley +1 more source
Special Vaterite Found in Freshwater Lackluster Pearls
, 2016 In recent years, scientists have special interests in biovaterite found in freshwater cultured lackluster pearls in south China. Vaterite is an unstable crystalline form of calcium carbonate and rare in nature.
Li Qiao (341210) +2 more
core +1 more source
Pharmaceutics, 2023 The widespread application of calcium carbonate is determined by its high availability in nature and simplicity of synthesis in laboratory conditions.
Yulia Svenskaya, Tatiana Pallaeva
doaj +1 more source
Advanced Functional Materials, Volume 36, Issue 36, 4 May 2026.ACC forms via aggregating prenucleation clusters that gatekeep its chemical composition. Ion identity steers the path: Ba and Sr substitute Ca in clusters, thereby inhibiting nucleation, with a dose‐dependent switch of Sr to induction. Mg partitions into Mg‐rich and Mg‐poor clusters; the latter form ACC, expelling Mg.
Qianyu Zhao +9 more
wiley +1 more source
Reliable Estimation of Wavenumbers for Calcite Peaks
Journal of Raman Spectroscopy, Volume 57, Issue 5, Page 821-827, May 2026.The wavenumbers of the calcite peaks were accurately estimated using a combination of a He–Ne laser and Ne emission lines. The values following the ± symbol represent the expanded uncertainties, corresponding to an approximate 95% confidence interval. ABSTRACT The Raman‐shift wavenumber ( ∆ν~), which is calculated as the difference between the absolute
Nobuyasu Itoh
wiley +1 more source
Microbialite Diversity and Ocean Redox Geochemistry of the Late Tonian Callison Lake Formation
Geobiology, Volume 24, Issue 3, May/June 2026.ABSTRACT Microbialites provide a unique insight into ancient microbial processes and environments, but trends in the diversity of unlaminated microbialites remain poorly understood. The ca. 745 Ma Callison Lake Formation in the Yukon (northwest Canada) features a range of microbialites which are diverse at both the mesoscale and microscale.
Charlotte Spruzen +5 more
wiley +1 more source
Propriétés optiques de la série bastnaesite-vaterite
, 1961 Dans la série bastnaesite-vaterite, on calcule, à partir des formules de Wiener, les courbes de nₒ² et I /ne² en fonction de la fraction en volume de vaterite. Ces courbes sont linéaires et rendent fidèlement compte des valeurs expérimentales des indices
Donnay, Gabrielle +1 more
core +1 more source
In Situ Raman Spectroscopy of a Silica Gel‐Templated Hydration Pathway in CO2‐Activated Cement
Journal of the American Ceramic Society, Volume 109, Issue 5, May 2026.ABSTRACT This study investigates early‐age carbonate mineralization in cementitious systems using in situ Raman microspectroscopy. In the presence of dissolved CO2, clinker phases undergo accelerated dissolution, decomposing to form various calcium carbonate polymorphs and a transient amorphous silica gel network.
Marcin Hajduczek +6 more
wiley +1 more source