Results 51 to 60 of about 2,604 (177)

Prenucleation Species Dictate Foreign Ion Incorporation in the Biomineral Precursor Amorphous Calcium Carbonate

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, Patrick Duchstein, Benedikt Demmert, Thi Q. Nhi Dao, Krishnaveni Anjala, Evelyn Gruber, Franziska Gröhn, Dirk Zahn, Dorrit E. Jacob, Stephan E. Wolf   +9 more
wiley   +1 more source

Impact of vaterite integration on the hydration, microstructure and performance of calcined clay cements

Scientific Reports
Vaterite Calcined Clay Cement (VC3) is a novel binder system in which the conventional calcite used in Limestone Calcined Clay Cement (LC3) is replaced with vaterite, a metastable polymorph of calcium carbonate characterized by its higher reactivity and ...
Mohammad H. Nofalah, Loucas Kyriakou, José M. Fernández, Íñigo Navarro-Blasco, José I. Álvarez   +4 more
doaj   +1 more source

Enhanced Vaterite And Aragonite Crystallization At Controlled Ethylene Glycol Concentrations

Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2019
Calciumcarbonate (CaCO3) has three distinct anhydrous polymorphs, namelyvaterite, aragonite and calcite. Although there is a high demand for aragoniteand vaterite polymorphs for biomedical use, their unstable nature makes itchallenging to synthesize them
Derya Kapusuz, Batur Ercan, Çağatay Mert Oral   +2 more
doaj   +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

Effects of temperature, pH and calcium-to-carbonate ratio on the calcium carbonate polymorphs

Discover Civil Engineering
The precipitation of calcium carbonate (CaCO3) polymorphs (calcite, vaterite, and aragonite) plays a crucial role in tailoring the physicochemical properties of construction materials during mineral carbonation.
Mohd Hanifa, Usha Sharma, P. C. Thapliyal, L. P. Singh   +3 more
doaj   +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, Malcolm W. Wallace, Maxwell A. Lechte, Ashleigh V. S. Hood, Brennan O'Connell, Galen P. Halverson   +5 more
wiley   +1 more source

A Review of the Structures of Vaterite: The Impossible, the Possible, and the Likely [PDF]

Crystal Growth & Design, 2017
The importance of the metastable vaterite form of CaCO is increasingly appreciated as an intermediate between amorphous calcium carbonate and more stable crystalline polymorphs in biogenic calcification pathways. Thus, there is a need to be able to identify nanocrystals of vaterite unambiguously, despite uncertainties about its exact crystal structure.
openaire   +4 more sources

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, Yogiraj Sargam, Sean Monkman, Vishnu Chaudhari, Santiago El Awad, Franz‐Josef Ulm, Admir Masic   +6 more
wiley   +1 more source

Facile synthesis of vaterite fine powder CaCO3 from padalarang natural limestone with pH modifying via fine-bubble carbonation

Materials Research Express
Natural limestone, known for its high calcium carbonate (CaCO _3 ) content (∼95%) and safety in health applications, is widely used in science and industry. It exists in three forms: calcite, vaterite, and aragonite.
Renny Febrida, Sekar Diva Setyanagari, Revani Widjaya, Yanwar Faza, Ferry Faizal, I Made Joni   +5 more
doaj   +1 more source

From Waste to Value: Conversion of Calcium Sulfate to Vaterite via Carbon Capture and Storage

Advanced Functional Materials, Volume 36, Issue 34, 27 April 2026.
This study introduces a new concept for carbon management that relies on the carbonation of industrial gypsum waste and yields phase‐pure vaterite at ambient conditions without any additives. The obtained vaterite is further shown to be a reactive material that develops compressive strength in aqueous suspensions like conventional cements.
Carlos Pimentel, German Montes‐Hernández, Pablo Almarza‐Cifuentes, Matthias Kellermeier, Alexander E.S. Van Driessche   +4 more
wiley   +1 more source