Method of specifying aqueous dispersions of polytetrafluoroethylene (PTFE) materials

2015 ◽  
Keyword(s):  
Aqueous Dispersions

Microstructural morphology of sphingolipid dispersions as investigated by freeze-fracture EM

1995 ◽  
Vol 53 ◽  
pp. 944-945
Author(s):  
Vitthal S. Kulkarni ◽  
Wayne H. Anderson ◽  
Rhoderick E. Brown
Keyword(s):  
Acyl Chain ◽  
Biological Significance ◽  
Freeze Fracture ◽  
Fatty Acyl ◽  
Fatty Acyl Moiety ◽  
Aqueous Dispersions ◽  
Head Groups ◽  
Lipid Species ◽  
Microstructural Morphology ◽  
Layer Chromatography

The biological significance of the sphingomyelins (SM) and monoglycosylated sphingolipids like galactosylceramides (GalCer) are well documented Our recent investigation showed tubular bilayers in the aqueous dispersions of N-nervonoyl GalCer [N-(24:lΔ15,cls) GalCer] (a major fatty acyl moiety of natural GalCer). To determine the influence of lipid head groups on the resulting mesophasic morphology, we investigated microstructural self-assemblies of N-nervonoyl-SM [N-(24:1 Δ15,cls) SM; the second most abundant sphingomyelin in mammalian cell membranes], 1- palmitoyl-2-nervonoyl phosphatidylcholine [PNPC] (the lipid species with the same acyl chain configuration as in N-(24: 1) GalCer) and also compared it with egg-SM by freeze-fracture EM.Procedures for synthesizing and purifying N-(24:1) GalCer, N-(24:1) SM, and PNPC have been reported . Egg-SM was purchased from Avanti Polar Lipids, Alabaster AL. All lipids were >99% pure as checked by thin layer chromatography. Lipid dispersions were prepared by hydrating dry lipid with phosphate buffer (pH 6.6) at 80-90°C (3-5 min), vigorously vortexing (1 min) and repeating this procedure for three times prior to three freeze-thaw cycles.

Metal-Organic Frameworks vs. Buffers: Case Study of UiO-66 Stability

2020 ◽  
Author(s):  
Daniel Bůžek ◽  
Slavomír Adamec ◽  
Kamil Lang ◽  
Jan Demel
Keyword(s):  
Inductively Coupled Plasma ◽  
Buffer Capacity ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Analytical Techniques ◽  
Aqueous Dispersions ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry ◽  
Metal Organic

<div><p>UiO-66 is a zirconium-based metal-organic framework (MOF) that has numerous applications. Our group recently determined that UiO-66 is not as inert in aqueous dispersions as previously reported in the literature. The present work therefore assessed the behaviour of UiO-66 in buffers: 2-amino-2-(hydroxymethyl)-1,3-propanediol (TRIS), 4-(2-hydroxyethyl)piperazine-1-ethane sulfonic acid (HEPES), N-ethylmorpholine (NEM) and phosphate buffer (PB), all of which are commonly used in many UiO-66 applications. High pressure liquid chromatography and inductively coupled plasma mass spectrometry were used to monitor degradation of the MOF. In each buffer, the terephthalate linker was released to some extent, with a more pronounced leaching effect in the saline forms of these buffers. The HEPES buffer was found to be the most benign, whereas NEM and PB should be avoided at any concentration as they were shown to rapidly degrade the UiO-66 framework. Low concentration TRIS buffers are also recommended, although these offer minimal buffer capacity to adjust pH. Regardless of the buffer used, rapid terephthalate release was observed, indicating that the UiO-66 was attacked immediately after mixing with the buffer. In addition, the dissolution of zirconium, observed in some cases, intensified the UiO-66 decomposition process. These results demonstrate that sensitive analytical techniques have to be used to monitor the release of MOF components so as to quantify the stabilities of these materials in liquid environments.</p></div>

The Effect of the Concentration of Non-ionic Surfactant Amphiphilic Molecules on the Structure and Gelation in Aqueous Dispersions

2020 ◽  
Vol 65 (9) ◽  
pp. 1475-1483
Author(s):  
S. A. Alekseeva ◽  
I. V. Baranets ◽  
V. N. Beresnev ◽  
T. A. Nadervel ◽  
A. D. Kryuchkov ◽  
...  
Keyword(s):  
Ionic Surfactant ◽  
Aqueous Dispersions ◽  
Amphiphilic Molecules

Effect of the rice flour particle size and variety type on water holding capacity and water diffusivity in aqueous dispersions

LWT ◽  
2021 ◽  
Vol 142 ◽  
pp. 111082
Author(s):  
Barbora Lapčíková ◽  
Lubomír Lapčík ◽  
Tomáš Valenta ◽  
Petr Majar ◽  
Kristýna Ondroušková
Keyword(s):  
Particle Size ◽  
Rice Flour ◽  
Water Holding Capacity ◽  
Aqueous Dispersions ◽  
Water Diffusivity ◽  
Water Holding

scholarly journals Ionic Properties of Aqueous Dispersions of Phosphatidic Acid

1964 ◽  
Vol 239 (12) ◽  
pp. 4066-4072 ◽  
Author(s):  
Morris B. Abramson ◽  
Robert Katzman ◽  
Clarence E. Wilson ◽  
Harry P. Gregor
Keyword(s):  
Phosphatidic Acid ◽  
Aqueous Dispersions

scholarly journals Autoxidation of cholesterol in aqueous dispersions and in monomolecular films

1972 ◽  
Vol 13 (2) ◽  
pp. 253-255
Author(s):  
Norman D. Weiner ◽  
Papavadee Noomnont ◽  
Alvin Felmeister
Keyword(s):  
Aqueous Dispersions ◽  
Monomolecular Films

scholarly journals Rheological Properties of Aqueous Dispersions of Xanthan Gum Containing Different Chloride Salts Are Impacted by both Sizes and Net Electric Charges of the Cations

2018 ◽  
Vol 13 (2) ◽  
pp. 186-197 ◽  
Author(s):  
Zoila Rosa Nieto Galván ◽  
Lucas de Souza Soares ◽  
Eber Antonio Alves Medeiros ◽  
Nilda de Fátima Ferreira Soares ◽  
Afonso Mota Ramos ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Xanthan Gum ◽  
Aqueous Dispersions ◽  
Chloride Salts

scholarly journals Tuning the Aggregation of Titanate Nanowires in Aqueous Dispersions

Langmuir ◽  
2015 ◽  
Vol 31 (1) ◽  
pp. 42-49 ◽  
Author(s):  
Tamás Szabó ◽  
Viktor Tóth ◽  
Endre Horváth ◽  
László Forró ◽  
Istvan Szilagyi
Keyword(s):  
Aqueous Dispersions ◽  
Titanate Nanowires

Relating structure and translational dynamics in aqueous dispersions of monoolein

2000 ◽  
Vol 106 (2) ◽  
pp. 115-126 ◽  
Author(s):  
B Geil ◽  
T Feiweier ◽  
E.-M Pospiech ◽  
J Eisenblätter ◽  
F Fujara ◽  
...  
Keyword(s):  
Aqueous Dispersions
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