Special Issue "Carbonates"

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystal Engineering".

Deadline for manuscript submissions: closed (30 November 2017)

Special Issue Editor

Guest Editor
Dr. Linda Pastero

Department of Earth Sciences, Interdepartmental Centre “Nanostructured Interfaces and Surfaces-NIS”, University of Torino, Italy
Website | E-Mail
Interests: crystal growth; epitaxy; surface; interface; calcite; gypsum; apatite; zeolite

Special Issue Information

Dear Colleagues,

Even though the study of the minerals belonging to the group of carbonates is a longstanding and sound out topic, its relevance remains unchanged, due to the countless implications for a wide range of disciplines, from mineralogy and geology to biology, medicine, and industry. Moreover, the study of the interactions between carbonates and other minerals, such as phosphates, or between carbonates and organics, may disclose new opportunities for understanding the mechanisms involved in natural phenomena, such as biomineralization.

The goal of this Special Issue on “Carbonates” is to provide a comprehensive overview about both the state-of-the-art and recent advances in crystal growth and characterization of carbonate phases, pointing out the mechanisms of growth, the interactions among phases, and the applications.

Scientists working in a wide range of disciplines are invited to contribute to this Special Issue.

The topics may include, but are not limited to, the following:

  • Natural and synthetic carbonates
  • Crystal growth of carbonates
  • Epitaxial relationships
  • Twinning
  • Bioinspired/biomimetic materials
  • Inorganic/organic self-organized materials (nacreous-like materials)
  • Inorganic complex systems (such as carbonate/phosphate for example)
  • Applications

Dr. Linda Pastero
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • carbonates
  • crystal growth
  • epitaxy
  • self-organized materials
  • bio-mineralogy
  • bio-inspired materials
  • bio-mimetic materials
  • environmental mineralogy

Published Papers (2 papers)

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Research

Open AccessArticle Hydrophobic Calcium Carbonate for Cement Surface
Crystals 2017, 7(12), 371; doi:10.3390/cryst7120371
Received: 14 November 2017 / Revised: 6 December 2017 / Accepted: 8 December 2017 / Published: 11 December 2017
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Abstract
This report describes a novel way to generate a highly effective hydrophobic cement surface via a carbonation route using sodium stearate. Carbonation reaction was carried out at different temperatures to investigate the hydrophobicity and morphology of the calcium carbonate formed with this process.
[...] Read more.
This report describes a novel way to generate a highly effective hydrophobic cement surface via a carbonation route using sodium stearate. Carbonation reaction was carried out at different temperatures to investigate the hydrophobicity and morphology of the calcium carbonate formed with this process. With increasing temperatures, the particles changed from irregular shapes to more uniform rod-like structures and then aggregated to form a plate-like formation. The contact angle against water was found to increase with increasing temperature; after 90 °C there was no further increase. The maximum contact angle of 129° was obtained at the temperature of 60 °C. It was also found that carbonation increased the micro hardness of the cement material. The micro hardness was found to be dependent on the morphology of the CaCO3 particles. The rod like structures which caused increased mineral filler produced a material with enhanced strength. The 13C cross polarization magic-angle spinning NMR spectra gave plausible explanation of the interaction of organic-inorganic moieties. Full article
(This article belongs to the Special Issue Carbonates)
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Open AccessArticle Crystallization of Calcium Carbonate in Alginate and Xanthan Hydrogels
Crystals 2017, 7(12), 355; doi:10.3390/cryst7120355
Received: 20 September 2017 / Revised: 21 November 2017 / Accepted: 27 November 2017 / Published: 30 November 2017
PDF Full-text (18918 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Calcium carbonate polymorphs were crystallized in alginate and xanthan hydrogels in which a degree of entanglement was altered by the polysaccharide concentration. Both hydrogels contain functional groups (COOH and OH) attached at diverse proportions on saccharide units. In all systems, the precipitation process
[...] Read more.
Calcium carbonate polymorphs were crystallized in alginate and xanthan hydrogels in which a degree of entanglement was altered by the polysaccharide concentration. Both hydrogels contain functional groups (COOH and OH) attached at diverse proportions on saccharide units. In all systems, the precipitation process was initiated simultaneously with gelation, by the fast mixing of the calcium and carbonate solutions, which contain the polysaccharide molecules at respective concentrations. The initial supersaturation was adjusted to be relatively high in order to ensure the conditions suitable for nucleation of all CaCO3 polymorphs and amorphous phase(s). In the model systems (no polysaccharide), a mixture of calcite, vaterite and amorphous calcium carbonate initially precipitated, but after short time only calcite remained. In the presence of xanthan hydrogels, precipitation of either, calcite single crystals, porous polyhedral aggregates, or calcite/vaterite mixtures were observed after five days of ageing, because of different degrees of gel entanglement. At the highest xanthan concentrations applied, the vaterite content was significantly higher. In the alginate hydrogels, calcite microcrystalline aggregates, rosette-like and/or stuck-like monocrystals and vaterite/calcite mixtures precipitated as well. Time resolved crystallization experiments performed in alginate hydrogels indicated the initial formation of a mixture of calcite, vaterite and amorphous calcium carbonate, which transformed to calcite after 24 h of ageing. Full article
(This article belongs to the Special Issue Carbonates)
Figures

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