Results 21 to 30 of about 21,941 (315)

A carbon–carbon hybrid – immobilizing carbon nanodots onto carbon nanotubes

open access: yesChemical Science, 2015
The thrust of this work is to integrate small and uniformly sized carbon nanodots (CNDs) with single-walled carbon nanotubes of different diameters as electron acceptors and electron donors, respectively, and to test their synergetic interactions in terms of optoelectronic devices.
Volker Strauss   +3 more
openaire   +5 more sources

Determination of carbon-carbon connectivities, assignment of quaternary carbons, and extraction of carbon-carbon coupling constants by carbon-relayed hydrogen-carbon spectroscopy

open access: yesJournal of Magnetic Resonance (1969), 1985
Nowadays many possibilities exist to elucidate carbon-carbon connectivity. In hydrogen-bearing carbon systems C-C connectivities can be traced out most conveniently in an indirect way by a combination of H-H COSY (I) and H-C CQSY (2). In case of overlapping ‘proton signals ambiguities can be removed by heteronuclear relayed spectroscopy (3) and ...
Kessler, Horst   +2 more
openaire   +2 more sources

Forced Mineral Carbonation of MgO Nanoparticles Synthesized by Aerosol Methods at Room Temperature

open access: yesNanomaterials, 2023
Magnesium oxide (MgO) has been investigated as a wet mineral carbonation adsorbent due to its relatively low adsorption and regeneration temperatures.
Kyungil Cho   +3 more
doaj   +1 more source

Carbonation and Corrosion Problems in Reinforced Concrete Structures

open access: yesBuildings, 2022
Reinforced concrete (RC) has been commonly used as a construction material for decades due to its high compressive strength and moderate tensile strength. However, these two properties of RC are frequently hampered by degradation.
Abdulrahman Fahad Al Fuhaid, Akbar Niaz
doaj   +1 more source

Carbon Emission Reduction—Carbon Tax, Carbon Trading, and Carbon Offset [PDF]

open access: yesEnergies, 2020
The Paris Agreement was signed by 195 nations in December 2015 to strengthen the global response to the threat of climate change following the 1992 United Nations Framework Convention on Climate Change (UNFCC) and the 1997 Kyoto Protocol [...]
openaire   +2 more sources

Observation of the depassivation effect of attrition on magnesium silicates' direct aqueous carbonation products

open access: yesFrontiers in Climate, 2022
The main obstacle to the aqueous carbonation of non-serpentinised magnesium silicates is the formation of surface passivation layers, which severely limits the reaction rate and thus the overall efficiency of the process.
Adrien Dufourny   +5 more
doaj   +1 more source

Carbon Storage in Portland Cement Mortar: Influences of Hydration Stage, Carbonation Time and Aggregate Characteristics

open access: yesClean Technologies, 2021
This study elucidates the effects of the particle size, carbonation time, curing time and pressure on the efficiency of carbon storage in Portland cement mortar.
Luqman Kolawole Abidoye, Diganta B. Das
doaj   +1 more source

Model fitting to concrete carbonation data with non-zero initial carbonation depth

open access: yes, 2023
Carbonation is a key mechanism for deterioration of reinforced concrete structures. In design for resistance to carbonation, the performance of mixes is often specified and measured in laboratory carbonation tests where initial carbonation is sometimes ...

core   +4 more sources

Coupling of attrition and accelerated carbonation for CO2 sequestration in recycled concrete aggregates

open access: yesCleaner Engineering and Technology, 2021
An accelerated carbonation method was applied to improve the ability of recycled aggregates to store CO2 through the rolling carbonation process; moreover, recycled concrete aggregates’ physicochemical properties to produce secondary aggregates for civil
Glaydson S. Dos Reis   +5 more
doaj   +1 more source

Experimental verification of carbonation models used for estimation of reinforced concrete structures durability [PDF]

open access: yesBulletin of the Polish Academy of Sciences: Technical Sciences, 2020
The subject of the article is a comparison of two types of concrete carbonation models: self-limited carbonation and infinite carbonation. The results of the research on the progress of carbonation during six years of sample exposure in natural ...
D. Stańczak   +3 more
doaj   +1 more source

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