TY - JOUR

T1 - Dynamic elasticity of films formed by poly(N-isopropylacrylamide) microparticles on a water surface

AU - Akentiev, A. V.

AU - Rybnikova, G. S.

AU - Novikova, A. A.

AU - Timoshen, K. A.

AU - Zorin, I. M.

AU - Noskov , B. A.

N1 - Akentiev, A.V., Rybnikova, G.S., Novikova, A.A. et al. Dynamic elasticity of films formed by poly(N-isopropylacrylamide) microparticles on a water surface. Colloid J 79, 571–576 (2017). https://doi.org/10.1134/S1061933X17050027

PY - 2017/9/21

Y1 - 2017/9/21

N2 - Surface dilatational dynamic elasticity ε of films formed by cross-linked poly(N-isopropylacrylamide) microparticles on a water/air interface has been determined as a function of polymer surface concentration Γ. The experimental dependences exhibit two maxima of ε at surface pressures π of nearly 6 and 35 mN/m. In the region of the second maximum, the pattern of the dependence is governed by a method used to vary Γ. At π > 25 mN/m, film compression leads to the formation of a metastable monolayer, while the gradual addition of a microparticle dispersion results in the establishment of equilibrium between the monolayer and surface aggregates. In the region of π values corresponding to the second maximum of ε, slow relaxation processes with a characteristic time substantially longer than 10 s occur in the system. At π > 35 mN/m, the film collapses due to the displacement of microgel particles from the water surface.

AB - Surface dilatational dynamic elasticity ε of films formed by cross-linked poly(N-isopropylacrylamide) microparticles on a water/air interface has been determined as a function of polymer surface concentration Γ. The experimental dependences exhibit two maxima of ε at surface pressures π of nearly 6 and 35 mN/m. In the region of the second maximum, the pattern of the dependence is governed by a method used to vary Γ. At π > 25 mN/m, film compression leads to the formation of a metastable monolayer, while the gradual addition of a microparticle dispersion results in the establishment of equilibrium between the monolayer and surface aggregates. In the region of π values corresponding to the second maximum of ε, slow relaxation processes with a characteristic time substantially longer than 10 s occur in the system. At π > 35 mN/m, the film collapses due to the displacement of microgel particles from the water surface.

UR - https://link.springer.com/article/10.1134/S1061933X17050027

M3 - Article

VL - 79

SP - 571

EP - 576

JO - Colloid Journal

JF - Colloid Journal

SN - 1061-933X

IS - 5

ER -