2 edition of study of phase separation of secondary dispersions. found in the catalog.
study of phase separation of secondary dispersions.
Fayez Mahmoud Suleiman Othman
by Aston University. Departmentof Chemical Engineering in Birmingham
Written in English
Thesis (MPhil) - Aston University, 1986.
Phase separation in drug dispersions is more complex as the drug could be either crystalline, amorphous, and even in intermediate stages such as drug rich domains and systems containing both amorphous and crystalline drug (Fig 1). However, despite the final form of phase separated drug in the formulation, the separation is a kinetic process. secondary geochemical dispersion The movement of elements at or just below the Earth's surface, which results from weathering, erosion, and deposition. Source for information on secondary geochemical dispersion: A Dictionary of Earth Sciences dictionary.
Explore the latest full-text research PDFs, articles, conference papers, preprints and more on EXTRACTIVE SEPARATION. Find methods information, sources, references or . Secondary dispersions are formed from very fine, microscopic oil drop- lets that have mean diameters between 50 and A and do not separate from water if left undisturbed for a very long time; they are stable thermody- namically. Highly turbulent flow conditions are favorable to the formation of secondary dispersions.
Phase separation is a simple, efficient, and cheap method to purify and concentrate detergent-solubilized membrane proteins. In spite of this, phase separation is not widely used or even known among membrane protein scientists, and ready-to-use protocols are available for only relatively few detergent/membrane protein combinations. The small changes in secondary structure propensity that were observed for K18 upon LLPS are thus in agreement with the dynamic and polymorphic nature of phase separation of intrinsically disordered proteins. The propensity for β-hairpin formation in repeats 2, 3 and 4 upon LLPS suggests that LLPS favors amyloid promoting structure of tau.
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The covalent diamantyl (C28H38) and oxadiamantyl (C26H34O2) dimers are stabilized by London dispersion attractions between the dimer moieties. Their solid-state and gas-phase structures were studied using a multitechnique approach, including single-crystal X-ray diffraction (XRD), gas-phase electron diffraction (GED), a combined GED/microwave (MW) spectroscopy study, and quantum Cited by: The origin of the conductivity enhancement due to secondary doping of PEDOT:PSS has been investigated in detail by AFM.
Secondary doping was used to increase the electrical conductivity from ± S/cm to ± 93 S/cm. Detailed study of the film surfaces revealed the phase separation between PEDOT and PSS induced by secondary by: Due to higher drug solubility, the dissolved drug in FeSSIF-V2 was much higher than that in the phosphate buffer.
Complete drug release could be observed by accounting for drug both in solution and as phase-separated dispersion.
Thus, the present study provides a complete picture of in vitro drug dissolution and dispersion from ASDs. Colloidal phase separation as a driving force in cellular organisation appealed strongly to Stephane Leduc, who wrote in his influential book The Mechanism of Life: "Hence the study of life may be best begun by the study of those physico-chemical phenomena which result from the contact of two different liquids.
Biology is thus but a branch. Phase diagram helps one to identify conditions that promote phase separation and to determine the likelihood of phase separation happening under physiological conditions (Fig.
1 A). Phase boundary, which is defined by the binodal line, indicates the boundary that two distinct phases stably co Cited by: Abstract.
A central theme to this book has been the formation of multiple phases within foods. We have seen how mismatched intermolecular interactions can lead to phase separation (Chaps. 4 and 7), how the properties of phase separated systems depend on the interface (Chap.
5), and even considered crystallization as an example of phase separation (Chap. 1. Introduction. The development of asymmetric polymeric membranes via non-solvent induced phase separation (NIPS) process is one of the most promising approaches to address water shortage [, ].In this method, a cast polymer dispersion is immersed in a nonsolvent bath, which leads to the formation and growth of polymer-rich and polymer-lean phases within the cast film.
The sudden decline in the release performance for ASDs with hydrophilic polymers when a certain drug loading was reached, was attributed to water-induced phase separation.
For ASDs with more hydrophobic polymers (HPMCAS and EUDS) the dissolution rate of both drug and polymer was polymer-controlled for drug loadings as high as 50%, with a more. The skin's barrier arises from proliferative cells that generate a perpetual upward flux of terminally differentiating epidermal cells.
Cells nearing the body surface suddenly lose their organelles, becoming dead cellular ghosts called squames. Working in mouse tissue, Garcia Quiroz et al. found that as differentiation-specific proteins accumulate in the keratinocytes, they undergo a vinegar.
Phase separation in pharmaceutical solid dispersion thin films under high humidity is still poorly understood on the submicrometer scale.
This study investigated the phase separation of a model solid dispersion thin film, felodipine-PVP K29/32, prepared by spin-coating and analyzed using probe-based methods including atomic force microscopy, nanothermal analysis, and photothermal.
Waals forces is strong thus preventing their separation. Phase Inversion This refers to the process whereby there will be an exchange between the disperse phase and the medium. For example, an O/W emulsion may with time or change of conditions invert to a W/O emulsion.
In many cases, phase inversion passes. The purpose of this study was to develop a novel fluorescence technique employing environment-sensitive fluorescent probes to study phase separation kinetics in hydrated matrices of amorphous solid dispersions (ASDs) following storage at high humidity and during dissolution.
The initial miscibility of the ASDs was confirmed using infrared (IR) spectroscopy and differential scanning.
Amorphous drug dispersions are becoming more and more utilized within the pharmaceutical industry, along with their academic study Their primary use is in facilitating the intake of poorly water soluble drugs by patients There has been much research conducted recently to develop an understanding of their physiochemical characteristics and stability in a wide range of conditions 2, This study proposes use of the phase separation of immiscible polymer blends as a formulation approach to improve the stabilization and solubilization of amorphous molecular dispersions of poorly soluble drugs.
This approach uses the phase separation and different drug solubilization properties of the two immiscible polymers in the blend to optimize drug loading and stabilization.
Of the two stable forms of graphite, hexagonal and rhombohedral, the former is more common and has been studied extensively. The latter is less. An Internet Book on Fluid Dynamics Disperse Phase Separation and Dispersion In order to determine the limits of a disperse phase ﬂow regime, it is necessary to identifythe dominant processes enhancing separation and those causing dispersion.
By far the most common process causing. This study proposes use of the phase separation of immiscible polymer blends as a formulation approach to improve the stabilization and solubilisation of amorphous molecular dispersions of poorly.
Phase Equilibriums, Chemical Equilibriums, and Solutions Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes Surface Chemistry and Colloids. 1 day ago Taf14 ET binds a short fragment of Sth1.
Previous studies have suggested that the Taf14 binds Sth1 – 2,24 (Fig. 1a).We first confirmed that Sth1 – indeed directly interacted. One study on the phase separation–prone protein TDP mapped a helical subregion (residues –) important for LLPS by observing chemical shift perturbations, which was then confirmed by testing the effect of mutations in this region on phase separation (9, 16).
This study aims to investigate the rheological properties and phase separation behavior of PPSU and sPPSU polymers with various degrees of sulfonation, and disclose their molecular-level interactions.A dispersion is a system in which distributed particles of one material are dispersed in a continuous phase of another material.
The two phases may be in the same or different states of matter. Dispersions are classified in a number of different ways, including how large the particles are in relation to the particles of the continuous phase, whether or not precipitation occurs, and the.The results obtained from the ATR-FTIR test demonstrated that the presence of nanoparticles led to an increase in phase separation, and the sample with the best nanoparticle dispersion has shown.