Isotopic effect on the aging dynamics of a charged colloidal system

RSC Advances ◽  
2012 ◽  
Vol 2 (29) ◽  
pp. 11111 ◽  
Author(s):  
V. Tudisca ◽  
M. A. Ricci ◽  
R. Angelini ◽  
B. Ruzicka
Keyword(s):  
Isotopic Effect ◽  
Colloidal System

Formation and Structure of Casein Micelles in Lactating Mammary Tissue

1970 ◽  
Vol 28 ◽  
pp. 150-151
Author(s):  
Robert J. Carroll ◽  
Marvin P. Thompson ◽  
Harold M. Farrell
Keyword(s):  
Size Distribution ◽  
G Protein ◽  
Milk Proteins ◽  
Mammary Tissue ◽  
Colloidal System ◽  
Casein Micelles ◽  
The Stability

Milk is an unusually stable colloidal system; the stability of this system is due primarily to the formation of micelles by the major milk proteins, the caseins. Numerous models for the structure of casein micelles have been proposed; these models have been formulated on the basis of in vitro studies. Synthetic casein micelles (i.e., those formed by mixing the purified αsl- and k-caseins with Ca2+ in appropriate ratios) are dissimilar to those from freshly-drawn milks in (i) size distribution, (ii) ratio of Ca/P, and (iii) solvation (g. water/g. protein). Evidently, in vivo organization of the caseins into the micellar form occurs in-a manner which is not identical to the in vitro mode of formation.

scholarly journals Feedback-controlled transport in an interacting colloidal system

2010 ◽  
Vol 92 (4) ◽  
pp. 40007 ◽  
Author(s):  
K. Lichtner ◽  
S. H. L. Klapp
Keyword(s):  
Colloidal System

A Study of the Colloidal System Carbon Dispersed in Xylene

1944 ◽  
Vol 48 (3) ◽  
pp. 125-133 ◽  
Author(s):  
V. R. Damerell ◽  
A. Urbanic
Keyword(s):  
Colloidal System

Untersuchung von Calciumisotopieeffekten bei heterogenen Austauschgleichgewichten / Investigation of Isotopic Effects of Calcium in Heterogeneous Exchange Equilibria

1972 ◽  
Vol 27 (2) ◽  
pp. 126-133 ◽  
Author(s):  
Klaus Gustav Heumann ◽  
Karl Heinrich Lieser
Keyword(s):  
Separation Factor ◽  
Calcium Concentration ◽  
Isotopic Fractionation ◽  
Ion Source ◽  
Isotopic Effect ◽  
Mass Unit ◽  
Calcium Isotopes ◽  
Heterogeneous Exchange ◽  
Loaded Column ◽  
Isotopic Effects

The following heterogeneous exchange equilibria have been examined for isotopic effects: CaCO3/Ca(aq.)2⊕. Ca-GBHA/Ca(aq.)2⊕ and Ca(Dowex 50)2⊕/Ca(aq.)2⊕ (GBHA = glyoxal-bis (2-hydroxyanil)). The isotopic ratios 44Ca/40Ca and 48Ca/40Ca were determined by means of a mass spectrometer with a thermal ion source. In the system CaCO3/Ca(aq.)2⊕, the elementary separation factor was found to be less than 1‰ or 0,5‰ per mass unit, respectively.For the exchange in the system Ca-GBHA/Ca(aq.)2⊕ in the concentration range from 0.011 to 0.84 M an elementary separation factor less than 1‰ per mass unit was found; from a three-stage experiment at a calcium concentration of 1.23 M it was concluded that the elementary isotopic effect is less than 0.4‰ per mass unit. Therefore no isotopic fractionation is to be expected for precipitation of inorganic or organic calcium salts.An enrichment of the heavier calcium isotopes in the solution was found in the case of the exchange in a Dowex 50-X12 loaded column. The isotopic effect depends on the concentration of the hydrochloric acid used as the eluent.

scholarly journals Anomalous Isotopic Effect on the Lattice Parameter of Silicon

2002 ◽  
Vol 89 (28) ◽  
Author(s):  
H.-C. Wille ◽  
Yu. V. Shvyd’ko ◽  
E. Gerdau ◽  
M. Lerche ◽  
M. Lucht ◽  
...  
Keyword(s):  
Lattice Parameter ◽  
Isotopic Effect

Dynamics calculations and isotopic effect in O + OH(D)? O2+ H(D) at low energies

1994 ◽  
Vol 90 (15) ◽  
pp. 2189 ◽  
Author(s):  
Jorge M. C. Marques ◽  
Wenli Wang ◽  
Ant�nio J. C. Varandas
Keyword(s):  
Isotopic Effect ◽  
Low Energies

scholarly journals Observation of ordered organic capping ligands on semiconducting quantum dots via powder X-ray diffraction

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jason J. Calvin ◽  
Tierni M. Kaufman ◽  
Adam B. Sedlak ◽  
Michelle F. Crook ◽  
A. Paul Alivisatos
Keyword(s):  
Quantum Dots ◽  
Colloidal System ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ligand Shell ◽  
Scattering Factor ◽  
Organic Capping ◽  
Capping Ligands ◽  
Key Techniques ◽  
Inorganic Structure

AbstractPowder X-ray diffraction is one of the key techniques used to characterize the inorganic structure of colloidal nanocrystals. The comparatively low scattering factor of nuclei of the organic capping ligands and their propensity to be disordered has led investigators to typically consider them effectively invisible to this technique. In this report, we demonstrate that a commonly observed powder X-ray diffraction peak around $$q=1.4{\AA}^{-1}$$ q = 1.4 Å − 1 observed in many small, colloidal quantum dots can be assigned to well-ordered aliphatic ligands bound to and capping the nanocrystals. This conclusion differs from a variety of explanations ascribed by previous sources, the majority of which propose an excess of organic material. Additionally, we demonstrate that the observed ligand peak is a sensitive probe of ligand shell ordering. Changes as a function of ligand length, geometry, and temperature can all be readily observed by X-ray diffraction and manipulated to achieve desired outcomes for the final colloidal system.

Use of RAFT macro-surfmers for the synthesis of transparent aqueous colloids with tunable interactions

Soft Matter ◽  
2017 ◽  
Vol 13 (37) ◽  
pp. 6439-6449 ◽  
Author(s):  
Umberto Capasso Palmiero ◽  
Azzurra Agostini ◽  
Enrico Lattuada ◽  
Simone Gatti ◽  
Jaspreet Singh ◽  
...  
Keyword(s):  
Colloidal System ◽  
Particle Interactions ◽  
Water Based ◽  
Tunable Interactions

A water-based colloidal system was designed, in which the particles can be buoyancy and optical matched with the solvent, and where inter-particle interactions are tuned by changing the temperature.

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