Colloidal Particle Adsorption at Water-Water Interfaces with Ultralow Interfacial Tension

doi:10.1103/PhysRevLett.120.208003

	Colloidal Particle Adsorption at Water-Water Interfaces with Ultralow Interfacial Tension
	Keal, Louis 2; Colosqui, Carlos E 3; Tromp, R Hans 1; Monteux, Cécile 2
刊名	Physical review letters
	2018-05-18
卷号	120 期号:20 页码:208003
ISSN号	1079-7114
DOI	10.1103/PhysRevLett.120.208003
文献子类	Article
英文摘要	Using fluorescence confocal microscopy we study the adsorption of single latex microparticles at a water-water interface between demixing aqueous solutions of polymers, generally known as a water-in-water emulsion. Similar microparticles at the interface between molecular liquids have exhibited an extremely slow relaxation preventing the observation of expected equilibrium states. This phenomenon has been attributed to "long-lived" metastable states caused by significant energy barriers ΔF∼γA_{d}≫k_{B}T induced by high interfacial tension (γ∼10^{-2} N/m) and nanoscale surface defects with characteristic areas A_{d}≃10-30 nm^{2}. For the studied water-water interface with ultralow surface tension (γ∼10^{-4} N/m) we are able to characterize the entire adsorption process and observe equilibrium states prescribed by a single equilibrium contact angle independent of the particle size. Notably, we observe crossovers from fast initial dynamics to slower kinetic regimes analytically predicted for large surface defects (A_{d}≃500 nm^{2}). Moreover, particle trajectories reveal a position-independent damping coefficient that is unexpected given the large viscosity contrast between phases. These observations are attributed to the remarkably diffuse nature of the water-water interface and the adsorption and entanglement of polymer chains in the semidilute solutions. This work offers some first insights on the adsorption dynamics or kinetics of microparticles at water-water interfaces in biocolloidal systems.
语种	英语
内容类型	期刊论文
源URL	[http://119.78.100.183/handle/2S10ELR8/266796]
专题	中国科学院上海药物研究所
作者单位	1.Van't Hoff Laboratory for Physical and Colloid Chemistry, Utrecht University, 3584 CH Utrecht, Netherlands 2.SIMM, ESPCI Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC-Paris 6, 75005 Paris, France; 3.Department of Mechanical Engineering, Stony Brook University, Stony Brook, New York 11794, USA;
推荐引用方式 GB/T 7714	Keal, Louis,Colosqui, Carlos E,Tromp, R Hans,et al. Colloidal Particle Adsorption at Water-Water Interfaces with Ultralow Interfacial Tension[J]. Physical review letters,2018,120(20):208003.
APA	Keal, Louis,Colosqui, Carlos E,Tromp, R Hans,&Monteux, Cécile.(2018).Colloidal Particle Adsorption at Water-Water Interfaces with Ultralow Interfacial Tension.Physical review letters,120(20),208003.
MLA	Keal, Louis,et al."Colloidal Particle Adsorption at Water-Water Interfaces with Ultralow Interfacial Tension".Physical review letters 120.20(2018):208003.