Morphologies and Crystal Phase Control of Calcium Carbonate Using “Crew-Cut” Micelles of Poly (styrene)-b-Poly (acrylic acid) as a Crystal Growth Modifier at Room Temperature

2011 ◽  
Vol 418-420 ◽  
pp. 398-401
Author(s):  
Qing Kai Li ◽  
Yan Ping Wang ◽  
Yi Min Wang
Keyword(s):  
Active Sites ◽  
Large Scale ◽  
Room Temperature ◽  
Spherical Shape ◽  
Gas Diffusion ◽  
Inorganic Materials ◽  
Crystal Phase ◽  
Diffusion Method ◽  
X Ray Diffraction ◽  
Gas Diffusion Method

Cubic layer-structured calcite and spherical vaterite were successfully prepared in the present of PS-b-PAA at room temperature. The products were characterized with scanning electron microscopy (SEM), X-ray diffraction (XRD) and flourier transform infrared spectrum (FI-IR). The characterized results revealed that the PS-b-PAA concentration had a considerable influence on the morphologies and crystal phase transformation. With the PS-b-PAA concentration increasing, the crystal phase of CaCO3particles would have a significant transition from calcite to vaterite, and the morphologies also showed remarkable changes from cubic layer-superstructure to spherical shape. Furthermore, cubic structured CaCO3 particles with a larger size of ca. 100 μm in side length could be prepared by gas diffusion method, indicating that the “crew-cut” micelles are able to result in long-live crystal active sites so that novel large-scale inorganic materials might be prepared.

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

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.

Effect of Porous and Nonporous Polycaprolactone Fiber Meshes on CaCO3 Crystallization Through a Gas Diffusion Method

2020 ◽  
Vol 20 (8) ◽  
pp. 5610-5625 ◽  
Author(s):  
Felipe Sepúlveda ◽  
Nicole Butto ◽  
José Luis Arias ◽  
Mehrdad Yazdani-Pedram ◽  
Piotr K. Szewczyk ◽  
...  
Keyword(s):  
Gas Diffusion ◽  
Diffusion Method ◽  
Gas Diffusion Method

A Novel Chemical Reduction Route towards the Synthesis of Nickel Nanoparticles at Room Temperature

2011 ◽  
Vol 694 ◽  
pp. 293-297
Author(s):  
Zhi Gang Wu
Keyword(s):  
Room Temperature ◽  
Nickel Nanoparticles ◽  
Chemical Reduction ◽  
Spherical Shape ◽  
Nickel Chloride ◽  
Metallic Nickel ◽  
Protective Agent ◽  
X Ray Diffraction ◽  
X Ray ◽  
Solid States

Pure metallic nickel nanoparticles, spherical shape have been successfully synthesized by the chemical reduction of nickel chloride with hydrazine at room temperature without any protective agent and inert gas protection. X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) were employed to characterize the nickel nanoparticles and of course, the magnetic properties were also measured. This synthetic method is proven to be simple and very facile. And it’s very interesting that the obtained nickel nanoparticle can be isolated in solid states and stabilized for several months in atmosphere.

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