scholarly journals Generality of Liquid Precursor Phases in Gas Diffusion-Based Calcium Carbonate Synthesis

CrystEngComm ◽  
2021 ◽  
Author(s):  
Maxim Benjamin Gindele ◽  
Luisa Vanessa Steingrube ◽  
Denis Gebauer
Keyword(s):  
Calcium Carbonate ◽  
Gas Diffusion ◽  
Diffusion Method ◽  
Liquid Precursor ◽  
Bioinspired Synthesis ◽  
Precursor Phases

The ammonia diffusion method (ADM) is one of the most widely used strategies for the bioinspired synthesis of minerals. Herein, we present investigations of the mineralization mechanism using an advanced...

Equilibrium distribution of radioxenon in tissue: xenon-hemoglobin association curve

1961 ◽  
Vol 16 (6) ◽  
pp. 1065-1070 ◽  
Author(s):  
Hadley L. Conn
Keyword(s):  
Partition Coefficients ◽  
Equilibrium Distribution ◽  
Hemoglobin Concentration ◽  
Gas Diffusion ◽  
In Vivo Studies ◽  
Diffusion Method ◽  
Body Tissues ◽  
Gas Diffusion Method

In vitro and in vivo studies were made of the equilibrium distribution of radioxenon in various organs and tissues of the dog and the xenon uptake compared with a water standard. Tissue-blood partition coefficients were calculated. The radioxenon-hemoglobin association curve was determined for dog and human hemoglobin and methemoglobin. The uptake of radioxenon by blood, due in particular to xenon-hemoglobin affinity, was appreciably greater than uptake either by water or by most other body tissues. Fat and brain were notable exceptions. Consequently, tissue-blood partition coefficients were about eight for fat, one for brain, and significantly less than one for other tissues studied. Acceptable accuracy for blood flow determinations with a radioxenon inert gas diffusion method would seem to depend on the use of a partition coefficient correction in turn corrected at least for the existing hemoglobin concentration. The uptake of xenon by hemoglobin had the characteristics of a solubility or a quasi-solubility phenomenon. The problem of the nature of the interaction is apparently not resolved. Submitted on June 19, 1961

scholarly journals Functionalized Multiwalled CNTs in Classical and Nonclassical CaCO3 Crystallization

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1169 ◽  
Author(s):  
Andrónico Neira-Carrillo ◽  
Patricio Vásquez-Quitral ◽  
Marianela Sánchez ◽  
Masoud Farhadi-Khouzani ◽  
Héctor Aguilar-Bolados ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Good Alternative ◽  
Gas Diffusion ◽  
High Tech ◽  
Amorphous Calcium Carbonate ◽  
Multiwalled Carbon ◽  
Selective Crystallization ◽  
First Time ◽  
Functionalized Mwcnts ◽  
Multiwalled Cnts

Multiwalled carbon nanotubes (MWCNTs) are interesting high-tech nanomaterials. MWCNTs oxidized and functionalized with itaconic acid and monomethylitaconate were demonstrated to be efficient additives for controlling nucleation of calcium carbonate (CaCO3) via gas diffusion (GD) in classical as well as nonclassical crystallization, yielding aragonite and truncated calcite. For the first time, all amorphous calcium carbonate (ACC) proto-structures, such as proto calcite-ACC, proto vaterite-ACC and proto aragonite-ACC, were synthesized via prenucleation cluster (PNC) intermediates and stabilized at room temperature. The MWCNTs also showed concentration-dependent nucleation promotion and inhibition similar to biomolecules in nature. Incorporation of fluorescein-5-thiosemicarbazide (5-FTSC) dye-labeled MWCNTs into the CaCO3 lattice resulted in fluorescent hybrid nanosized CaCO3. We demonstrate that functionalized MWCNTs offer a good alternative for controlled selective crystallization and for understanding an inorganic mineralization process.

Surface morphology and molecular bonding of CaCO3 nanocrystallites by gas diffusion method

2018 ◽  
Author(s):  
N. H. Sulimai ◽  
Rozina Abdul Rani ◽  
Z. Khusaimi ◽  
S. Abdullah ◽  
M. J. Salifairus ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Gas Diffusion ◽  
Diffusion Method ◽  
Molecular Bonding ◽  
Gas Diffusion Method

Flow injection gas-diffusion method for preconcentration and determination of trace sulfide

1988 ◽  
Vol 60 (24) ◽  
pp. 2791-2796 ◽  
Author(s):  
Emil B. Milosavljevic ◽  
Ljiljana. Solujic ◽  
James L. Hendrix ◽  
John H. Nelson
Keyword(s):  
Flow Injection ◽  
Gas Diffusion ◽  
Diffusion Method ◽  
Gas Diffusion Method

Luminescence and Absorption of Hybrid Xerogels Doped with PbS Nanoparticles Prepared by Gas Diffusion Method

2006 ◽  
Vol 514-516 ◽  
pp. 1221-1224 ◽  
Author(s):  
Julia T. Gonçalves ◽  
Victor I. Boev ◽  
Alexey Solovyev ◽  
Carlos J.R. Silva ◽  
M.J.M. Gomes
Keyword(s):  
Gas Diffusion ◽  
Argon Atmosphere ◽  
Diffusion Method ◽  
Absorbance Spectrum ◽  
Pbs Nanoparticles ◽  
Enhanced Photoluminescence ◽  
Infra Red ◽  
Hybrid Xerogels ◽  
Gas Diffusion Method ◽  
Photoluminescence Response

Transparent hybrid organic-inorganic ureasil xerogels with embedded PbS nanoparticles were prepared by exposing the xerogels doped with lead (II) nitrate to hydrogen sulphide atmosphere. Absorbance spectrum of the nonocomposites showed well defined peaks at 560 nm and 370 nm attributed to 1s(v) - 1s(c) and 1s(v) - 2p(c) exciton transitions, respectively. After four days of thermal treatment at 50 °C under argon atmosphere the obtained materials showed enhanced photoluminescence response in the near infra-red region.

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