Optical Polydispersity and Contrast Variation Effects in Colloidal Dispersions

Banchio, Adolfo J.; Nägele, Gerhard; Ferrante, A.

doi:10.1006/jcis.1998.5835

Cited by 3 publications

(2 citation statements)

References 32 publications

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“…The static and short-time dynamic properties of bulk dispersions of monodisperse and polydisperse colloidal spheres are well understood both from the experimental 1,4-10 and theoretical [7][8][9][11][12][13][14][15] point of view. On the other hand, the theoretical prediction of dynamic properties at intermediate and long times is far more difficult due to the occurrence of memory effects which depend both on direct and hydrodynamic interparticle forces.…”

Section: Introductionmentioning

confidence: 99%

Collective diffusion, self-diffusion and freezing criteria of colloidal suspensions

Banchio

Nägele

Bergenholtz

2000

The Journal of Chemical Physics

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In this paper, we examine collective and self-diffusion properties of dispersions of spherically shaped colloidal particles at intermediate and long times. Our analysis is based on a fully self-consistent ͑rescaled͒ mode coupling theory ͑MCT͒ adjusted to describe the overdamped dynamics in concentrated suspensions of neutral and charged colloidal particles. The dynamical quantities studied in dependence on various experimentally controllable system parameters are the particle mean-squared displacement, long-time collective and self-diffusion coefficients, dynamic structure factors, nonexponentiallity factors and collective and self-memory functions. The results of our theoretical treatment are compared with Brownian dynamics computer simulation data, experiment and other existing theories. It is shown that the rescaled MCT can be successfully applied to a wide range of dynamical properties. Our calculations reveal in particular an exponential long-time mode of the dynamic structure factor for a limited range of wave numbers and at sufficiently high concentrations. A dynamic scaling behavior of the dynamic structure factor and self-intermediate scattering function is predicted for the important case of salt-free charge-stabilized suspensions. As a consequence of the dynamic scaling, the static freezing criterion for colloids by Hansen and Verlet ͓Phys. Rev. 184, 151 ͑1969͔͒ is shown to be equivalent with the dynamic criterion by Löwen et al. ͓Phys. Rev. Lett. 70, 1557 ͑1993͔͒ related to long-time self-diffusion.

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Section: Introductionmentioning

confidence: 99%

Collective diffusion, self-diffusion and freezing criteria of colloidal suspensions

Banchio

Nägele

Bergenholtz

2000

The Journal of Chemical Physics

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“…The average molecular weight can be divided into the number average molecular weight, weight‐average molecular weight and viscosity average molecular weight; the ratio of weight‐average molecular weight is the PDI. The larger the PDI, the wider the molecular weight distribution (Banchio et al ., 1998). Figure 3 and Table 2 show the Z‐average diameter and PDI variation trend of enzymatic hydrolysate, SPI‐KGM conjugates and core–shell nanogels.…”

Section: Resultsmentioning

confidence: 99%

Improved stability and transshipment of enzymatic hydrolysate with ACE inhibitory activity‐loaded nanogels based on glycosylated soybean protein isolate via the Maillard reaction

Cui

Jia

Shi

et al. 2021

Int J of Food Sci Tech

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Summary In this study, soybean protein isolate (SPI)‐konjac glucomannan (KGM) conjugates were fabricated via the Maillard reaction and their potential to improve enzymatic hydrolysate with ACE inhibitory activity stability was assessed. Briefly, we loaded the enzymatic hydrolysate into SPI‐KGM conjugates using a pH‐driven method. Thereafter, the transport pathway of enzymatic hydrolysate with angiotensin‐converting enzyme (ACE) inhibitory activity SPI‐KGM (ACE‐SPI‐KGM) core–shell nanogels was investigated using CaCo‐2 cell monolayer. The results of microstructure, encapsulation efficiency, ACE inhibition ratio and IC50 value verified that the nanogels displayed a spherical structure and excellent physicochemical properties. The ζ‐potential, Z‐average diameter and polydispersity index demonstrated that the stability of the core–shell nanogels was significantly superior to that of the enzymatic hydrolysate. In addition, the transport of the enzymatic hydrolysate in nanogels onto the CaCo‐2 cell monolayer revealed a higher transport capacity and was dominated by cell bypass transport. In summary, the SPI‐KGM conjugates could serve as potential as delivery systems for enzymatic hydrolysate with ACE inhibitory activity to fortify functional foods and medicines.

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Dynamics of core-shell particles in concentrated suspensions

et al. 2004

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The dynamics of soft colloidal particles in a concentrated suspension was studied by two color dynamic light scattering. The short-time diffusion coefficient, D(s)(q), revealed a weak slowing down around the peak of S(q) in contrast to the much stronger dependence observed in hard sphere systems, and the absence of any slowing down in ultrasoft diblock micelles. The low-q limit of the diffusion coefficient, D(s)(q=0), reflecting the cooperative nature of the dynamics was found to decrease from its dilute limit value in contrast to the weak increase observed in hard sphere systems. The behavior of D(s)(q) reflects distinct polymer-layer-induced hydrodynamic effects present in concentrated suspensions of core-shell particles.

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Optical Polydispersity and Contrast Variation Effects in Colloidal Dispersions

Cited by 3 publications

References 32 publications

Collective diffusion, self-diffusion and freezing criteria of colloidal suspensions

Collective diffusion, self-diffusion and freezing criteria of colloidal suspensions

Improved stability and transshipment of enzymatic hydrolysate with ACE inhibitory activity‐loaded nanogels based on glycosylated soybean protein isolate via the Maillard reaction

Dynamics of core-shell particles in concentrated suspensions

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