Ammonium-Carbamate-Rich Organogels for the Preparation of Amorphous Calcium Carbonates

Bacsik, Zoltán; Zhang, Peng; Hedin, Niklas

doi:10.3390/min7070110

Cited by 4 publications

(2 citation statements)

References 40 publications

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“…The chemical structures of gelators capable of forming organogels present groups as amides [ 14 , 15 , 16 ], carbamates [ 17 , 18 , 19 , 20 ], amino acids [ 21 ], carbohydrates [ 22 , 23 , 24 , 25 , 26 , 27 ], ureas [ 28 , 29 , 30 , 31 , 32 , 33 ] or a combination of these functional groups [ 34 , 35 , 36 , 37 , 38 , 39 , 40 ]. For this reason, all gelators of this study are composed of a hydrophilic and hydrophobic part, resulting in amphiphilic behavior [ 41 , 42 ].…”

Section: Introductionmentioning

confidence: 99%

New Carbamates and Ureas: Comparative Ability to Gel Organic Solvents

Martínez‐Mejía

Bermeo-Solórzano

González

et al. 2022

Gels

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Two series of novel amphiphilic compounds were synthesized based on carbamates and ureas structures, using a modification of the synthesis methods reported by bibliography. The compounds were tested for organic solvent removal in a model wastewater. The lipophilic group of all compounds was a hexadecyl chain, while the hydrophilic substituent was changed with the same modifications in both series. The structures were confirmed by FT-IR, NMR, molecular dynamic simulation and HR-MS and their ability to gel organic solvents were compared. The SEM images showed the ureas had a greater ability to gel organic solvents than the carbamates and formed robust supramolecular networks, with surfaces of highly interwoven fibrillar spheres. The carbamates produced corrugated and smooth surfaces. The determination of the minimum gelation concentration demonstrated that a smaller quantity of the ureas (compared to the carbamates, measured as the weight percentage) was required to gel each solvent. This advantage of the ureas was attributed to their additional N-H bond, which is the only structural difference between the two types of compounds, and their structures were corroborated by molecular dynamic simulation. The formation of weak gels was demonstrated by rheological characterization, and they demonstrated to be good candidates for the removal organic solvents.

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Section: Introductionmentioning

confidence: 99%

New Carbamates and Ureas: Comparative Ability to Gel Organic Solvents

Martínez‐Mejía

Bermeo-Solórzano

González

et al. 2022

Gels

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“…Ochiai and Utsunomiya [21] investigate the crystal chemical properties of hydrous rare-earth phosphates, forming at an ambient temperature with fractions of an amorphous component with an increasing ionic radius. Finally, Bacsik et al [22] demonstrate that amine-CO 2 chemistry, which is important for carbon dioxide capture, can be used to prepare amorphous calcium carbonate.…”

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confidence: 99%

Editorial for Special Issue “Nucleation of Minerals: Precursors, Intermediates and Their Use in Materials Chemistry”

Gebauer¹

2018

Minerals

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Nucleation is the key event in mineralization, but a general molecular understanding of phase separation mechanisms is still missing, despite more than 100 years of research in this field [1]. In the recent years, many studies have highlighted the occurrence of precursors and intermediates, which seem to challenge the assumptions underlying classical theories of nucleation and growth. This is especially true for the field of biomineralization, where bio-inspired strategies take advantage of the precursors' and intermediates' special properties for the generation of advanced materials. All of this has led to the development of "non-classical" frameworks, which, however, often lack quantitative expressions for the evaluation and prediction of phase separation, growth and ripening processes, and are under considerable debate. It is, thus, evident that there is a crucial need for research into the early stages of mineral nucleation and growth, designed for the testing, refinement and expansion of the different existing notions. This special issue of Minerals aimed to bring together corresponding studies from all these areas, dealing with precursors and intermediates in mineralization with the hope that it may contribute to the achievement of a better understanding of nucleation precursors and intermediates, and their target-oriented use in materials chemistry.In his commentary, Evans [2] summarises different existing nucleation theories and discusses them from the point of view of biomineralization. The focus lies on proteins and their role in mineral precursor formation, stabilisation, and assembly into crystalline polymorphs. It is stressed that a limitation of the advancement of the understanding of protein-controlled mineralization processes [3] is, at least, partly due to variations in techniques, methodologies and the lack of standardisation in mineral assay experimentation. Evans argues that the protein community should adopt standardized nucleation assays [4,5], allowing for cross-comparisons and kinetic observations. Burgos-Cara et al. [6] use such an experimental approach for studying the effects of background ionic species on the formation and stability of CaCO 3 pre-nucleation species in aqueous solutions. They find that the effective critical supersaturation in the presence of background ions with a decreasing ionic radius becomes systematically higher, and propose that the stabilisation of hydration water molecules impedes dehydration processes, which are essential steps during mineral precipitation, according to the notions of the so-called pre-nucleation cluster pathway [1].Several papers of this Minerals special issue address further methodological aspects associated with research into mineral nucleation and growth. The contribution of Kröger and Verch [7] deals with studies employing liquid cell transmission electron microscopy (LCTEM). 2D finite element simulations highlight that the confinement, which occurs in typical LCTEM cells and can significantly reduce the concentration of available ions, c...

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Sequential Pore Functionalization in MOFs for Enhanced Carbon Dioxide Capture

Yadav,

Gładysiak,

Song

et al. 2024

JACS Au

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The capture of carbon dioxide (CO 2 ) is crucial for reducing greenhouse emissions and achieving net-zero emission goals. Metal−organic frameworks (MOFs) present a promising solution for carbon capture due to their structural adaptability, tunability, porosity, and pore modification. In this research, we explored the use of a copper (Cu(II))-based MOF called mCBMOF-1. After activation, mCBMOF-1 generates one-dimensional channels with square cross sections, featuring sets of four Cu(II) open metal sites spaced by 6.042 Å, allowing strong interactions with coordinating molecules. To investigate this capability, mCBMOF-1 was exposed to ammonia (NH 3 ) gas, resulting in hysteretic NH 3 isotherms indicative of strong interactions between Cu(II) and NH 3 . At 150 mbar and 298 K, the NH 3 -loaded (∼1 mmol/g) material exhibited a 106% increase in CO 2 uptake compared to that of the pristine mCBMOF-1. Carbon-13 solid-state nuclear magnetic resonance spectra and density functional theory calculations confirmed that the sequential loading of NH 3 followed by CO 2 adsorption generated a copper−carbamic acid complex within the pores of mCBMOF-1. Our study highlights the effectiveness of sequential pore functionalization in MOFs as an attractive strategy for enhancing the interactions of MOFs with small molecules such as CO 2 .

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Ammonium-Carbamate-Rich Organogels for the Preparation of Amorphous Calcium Carbonates

Cited by 4 publications

References 40 publications

New Carbamates and Ureas: Comparative Ability to Gel Organic Solvents

New Carbamates and Ureas: Comparative Ability to Gel Organic Solvents

Editorial for Special Issue “Nucleation of Minerals: Precursors, Intermediates and Their Use in Materials Chemistry”

Sequential Pore Functionalization in MOFs for Enhanced Carbon Dioxide Capture

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