Emulsions

Heusch, R.

doi:10.1002/14356007.a09_297

Cited by 9 publications

(9 citation statements)

References 162 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Die erforderlichen HLB‐Werte wurden für zahlreiche Fettphasen experimentell ermittelt. Hierzu werden Versuchsreihen mit Emulgatoren unterschiedlicher HLB‐Werte [8] durchgeführt und die jeweilige emulgierende Wirkung verglichen – das Verfahren ist in der Kosmetikbranche üblich, da hier teils auf komplexere Fettgemische zurückgegriffen wird, für die tabellierte erforderliche HLB‐Werte fehlen.…”

Section: Erklärungunclassified

Drum prüfe, was sich ewig mischet …

Hild

Kallinna

Murer

et al. 2021

Chemie in nserer Zeit

View full text Add to dashboard Cite

Anliegen der in loser Folge erscheinenden Versuche ist es, Impulse für chemische Versuche zu geben, die gefahrlos zu Hause mit haushaltsüblichen Gegenständen durchgeführt werden können. Sie können damit als Quelle für das gemeinsame Ausprobieren mit Kindern zuhause dienen, in Kindergärten oder an Schulen sowie zur Verwendung bei Tagen der offenen Tür. Ein Stückweit sind sie zu verstehen als Antwort auf den oft gehörten Satz: „Ach, Du bist Chemiker/in!? Dann mach doch mal eben ein Experiment.“

show abstract

Section: Erklärungunclassified

Drum prüfe, was sich ewig mischet …

Hild

Kallinna

Murer

et al. 2021

Chemie in nserer Zeit

View full text Add to dashboard Cite

show abstract

“…The used surfactant, Tergitol, has a HLB of 13.3, which is adequate to prepare oil-in-water emulsions . [29] Furthermore, an influence on the overall efficiency, according to Johansen et al, [30] is the polar interaction between PLGA and the active principle; in this case, the interaction between PLGA and thyme oil through its hydrophilic part. These interactions are established through hydrogen bonds which allow greater stability between the polymer and the oil.…”

Section: Gas Chromatography Gc-fid/msmentioning

confidence: 99%

Microencapsulation of red and white thyme oil in poly(lactic‐co‐glycolic) acid: Assessment of encapsulation efficiency and antimicrobial capacity of the produced microcapsules

et al. 2016

View full text Add to dashboard Cite

In this work, microcapsules were formed by coating thyme oil with a biodegradable polymer, poly(lactic‐co‐glycolic) acid (PLGA), through a coacervation process recently developed at our laboratory and previously studied for poly lactic acid (PLA). The coacervation method involves dissolution of the polymer (PLGA 50:50) in dimethylformamide. After adding this solution to the oil/water (o/w) emulsion, and due the insolubility of the polymer in water, polymer deposition occurs around the oil droplets and microcapsule formation starts. PLGA was chosen due to its easy biodegradation and biocompatibility. The active principle, thyme oil, is characterized by excellent antimicrobial activity ascribed to the presence of thymol and carvacrol, its major components. Two types of thyme oil (red and white) were microencapsulated and the produced microcapsules were characterized using optical microscopy, particle size analysis, and gas chromatography (used to evaluate encapsulation efficiency). Antimicrobial activity was preliminarily evaluated following ASTM E2149‐01. Microscopy and particle size analysis confirmed the existence of microcapsules with round shapes, smooth surfaces, particle diameters between ∼45–49 μm, and wall thicknesses ∼3.5 μm. Global encapsulation efficiencies of thyme oil (both red and white) were 70 % and 57 %, respectively. The produced microcapsules exhibited a sustained oil release that ensures a level of antimicrobial activity maintenance desirable for cosmetic applications.

show abstract

“…Emulsions, which are fine dispersions of drops of one liquid in another liquid, are common to a variety of industries including food (Friberg, Larsson & Sjöblom 2003), oil and gas (Kilpatrick 2012), pharmaceuticals (Heusch 1987) and chemicals (Moinard-Checot et al. 2006).…”

Section: Introductionmentioning

confidence: 99%

Inertial impedance of coalescence during collision of liquid drops

et al. 2019

View full text Add to dashboard Cite

The fluid dynamics of the collision and coalescence of liquid drops has intrigued scientists and engineers for more than a century owing to its ubiquitousness in nature, e.g. raindrop coalescence, and industrial applications, e.g. breaking of emulsions in the oil and gas industry. The complexity of the underlying dynamics, which includes occurrence of hydrodynamic singularities, has required study of the problem at different scales – macroscopic, mesoscopic and molecular – using stochastic and deterministic methods. In this work, a multi-scale, deterministic method is adopted to simulate the approach, collision, and eventual coalescence of two drops where the drops as well as the ambient fluid are incompressible, Newtonian fluids. The free boundary problem governing the dynamics consists of the Navier–Stokes system and associated initial and boundary conditions that have been augmented to account for the effects of disjoining pressure as the separation between the drops becomes of the order of a few hundred nanometres. This free boundary problem is solved by a Galerkin finite element-based algorithm. The interplay of inertial, viscous, capillary and van der Waals forces on the coalescence dynamics is investigated. It is shown that, in certain situations, because of inertia two drops that are driven together can first bounce before ultimately coalescing. This bounce delays coalescence and can result in the computed value of the film drainage time departing significantly from that predicted from existing scaling theories.

show abstract

Emulsions

Abstract: The article contains sections titled: 1. Definitions 2. Properties of Emulsions … Show more

Cited by 9 publications

References 162 publications

Drum prüfe, was sich ewig mischet …

Drum prüfe, was sich ewig mischet …

Microencapsulation of red and white thyme oil in poly(lactic‐co‐glycolic) acid: Assessment of encapsulation efficiency and antimicrobial capacity of the produced microcapsules

Inertial impedance of coalescence during collision of liquid drops

Contact Info

Product

Resources

About