73 citations · 445 across the 17 of their papers we have counts for
17 papers · 1 filter
Polymorphic phase transitions in bulk triglyceride mixtures
Diana Cholakova, Slavka Tcholakova, Nikolai Denkov
Triacylglycerols (TAGs) are among the most important ingredients in food, cosmetic and pharmaceutical products. Many physical properties of such products, incl. morphology, texture…
Role of particles size on the cohesive strength of non-sintered (green) ceramics
M. Hristova, I. Lesov, L. Mihaylov +2
Preparation of particle-loaded foams, followed by drying, sintering and/or cross-linking are widely explored routes for developing lightweight ceramics with high mechanical strengt…
Minimum Surfactant Concentration Required for Inducing Self-shaping of Oil Droplets and Competitive Adsorption Effects
Jiale Feng, Zhulieta Valkova, E Emily Lin +5
Surfactant choice is key in starting the phenomena of artificial morphogenesis, the bottom-up growth of geometric particles from cooled emulsion droplets, as well as the bottom-up…
Flow reactor for preparation of lipid nanoparticles via temperature variations
I. Lesov, D. Glushkova, D. Cholakova +4
Lipid nanoemulsions and nanosuspensions are used as flavor carriers and bubble stabilizers in soft drinks and foods, as well as delivery vehicles for lipophilic drugs in pharmaceut…
Self-emulsification in chemical and pharmaceutical technologies
D. Cholakova, Z. Vinarov, S. Tcholakova +1
The interest in the low energy self-emulsification techniques has exploded in the recent years, driven by three main trends: by the transition to "greener" technologies in both its…
Rheological properties of rotator and crystalline phases of alkanes
Diana Cholakova, Krastina Tsvetkova, Slavka Tcholakova +1
Linear long-chain organic molecules are known to form lamellar intermediate phases (called also rotator phases) between their fully ordered crystalline phases and their isotropic l…
Rechargeable self-assembled droplet microswimmers driven by surface phase transitions
Diana Cholakova, Maciej Lisicki, Stoyan K. Smoukov +6
The design of artificial microswimmers is often inspired by the strategies of natural microorganisms. Many of these creatures exploit the fact that elasticity breaks the time-rever…
Rotator phases in hexadecane emulsion drops revealed by X-ray synchrotron techniques
Diana Cholakova, Desislava Glushkova, Zhulieta Valkova +4
Micrometer sized alkane-in-water emulsion drops, stabilized by appropriate long-chain surfactants, spontaneously break symmetry upon cooling and transform consecutively into series…
Cold-burst method for nanoparticle formation with natural triglyceride oils
Diana Cholakova, Desislava Glushkova, Slavka Tcholakova +1
Preparation of nanoemulsions of triglyceride oils in water usually requires high mechanical energy and sophisticated equipment. Recently, we showed that alpha-to-beta (viz. gel-to-…
Origin of the extremely high elasticity of bulk emulsions, stabilized by Yucca Schidigera saponins
Sonya Tsibranska, Slavka Tcholakova, Konstantin Golemanov +4
We found experimentally that the elasticity of sunflower oil-in-water emulsions (SFO-in-W) stabilized by Yucca Schidigera Roezl saponin extract, is by more than 50 times higher as…
Role of interfacial elasticity for the rheological properties of saponin-stabilized emulsions
Sonya Tsibranska, Slavka Tcholakova, Konstantin Golemanov +3
Hypothesis Saponins are natural surfactants which can provide highly viscoelastic interfaces. This property can be used to quantify precisely the effect of interfacial dilatational…
Foamability of aqueous solutions: Role of surfactant type and concentration
B. Petkova, S. Tcholakova, M. Chenkova +4
In this paper we study the main surface characteristics which control the foamability of solutions of various surfactants. Experiments with anionic, cationic and nonionic surfactan…
Food grade nanoemulsions preparation by rotor-stator homogenization
Dilek Gazolu-Rusanova, Ivan Lesov, Slavka Tcholakova +2
High-pressure homogenizers, typically used for producing nanoemulsions at the industrial scale, are energy and maintenance intensive, and limited to produce only dilute, low viscos…
Spontaneous particle desorption and "Gorgon" drop formation from particle-armored oil drops upon cooling
Diana Cholakova, Zhulieta Valkova, Slavka Tcholakova +2
Drop "self-shaping" is a phenomenon in which cooled oily emulsion drops undergo a spectacular series of shape transformations (Denkov et al., Nature 528, 2015, 392). Solid particle…
Surface phase transitions in foams and emulsions
Nikolai Denkov, Slavka Tcholakova, Diana Cholakova
Surface phase transitions in surfactant adsorption layers are known to affect the dynamic properties of foams and to induce surface nucleation in freezing emulsion drops. Recently,…
Jamming in sheared foams and emulsions, explained by critical instability of the films between neighboring bubbles and drops
N. D. Denkov, S. Tcholakova, K. Golemanov +1
Phenomenon of foam and emulsion jamming at low shear rates is explained by considering the dynamics of thinning in the transient film, formed between the neighboring bubbles and dr…
Theoretical model of viscous friction inside steadily sheared foams and concentrated emulsions
S. Tcholakova, N. D. Denkov, K. Golemanov +2
In a recent letter (Denkov et al., Phys. Rev. Lett., vol. 100 (2008) p. 138301) we calculated theoretically the macroscopic viscous stress of steadily sheared foam/emulsion from th…