Header menu link for other important links
X
Self assembly of oppositely charged latex particles at oil-water interface
Srikanth Ragothaman,
Published in Academic Press Inc.
2017
PMID: 27728826
Volume: 486
   
Pages: 325 - 336
Abstract
In this study we explore the self assembly of oppositely charged latex particles at decane water interfaces. Two spreading protocols have been proposed in this context. In the first method oppositely charged particles are mixed prior to spreading at the interface, this is called “premixed-mixtures”. In the second protocol negatively charged particles are first spread at the interface at known coverage followed by spreading positively charged particles at known coverage and this is called “sequential-mixtures”. In premixed mixtures depending on particle mixing ratio (composition) and total surface coverage a number of 2d structures ranging from 2d crystals, aggregate-crystal coexistence and 2d-gels are observed. A detailed phase diagram of this system has been explored. In sequential-mixtures for the first time we observed a new phase in colloidal monolayers called 2d-bi crystalline domains. These structures consisted regions of two crystal phases of oppositely charged particles separated by a one dimensional chain of alternating positive and negative particles. Phase diagram of this system has also been explored at various combinations of first spread and second spread particles. A possible mechanism leading to formation of these 2d bi crystalline structures has been discussed. A direct visualization of breakage and reformation of particle barriers separating the crystal phases has been demonstrated through videos. Effect of salt in the water sub phase and particle hydrophobicity on domain formation is also investigated. © 2016 Elsevier Inc.
About the journal
JournalJournal of Colloid and Interface Science
PublisherAcademic Press Inc.
ISSN00219797
Open AccessNo
Concepts (33)
  •  related image
    Agglomeration
  •  related image
    Binary mixtures
  •  related image
    Crystalline materials
  •  related image
    Latexes
  •  related image
    Phase diagrams
  •  related image
    Phase interfaces
  •  related image
    Self assembly
  •  related image
    BINARY PARTICLE MIXTURES
  •  related image
    COLLOIDAL CRYSTALS
  •  related image
    Crystalline structure
  •  related image
    DIRECT VISUALIZATION
  •  related image
    HETEROAGGREGATION
  •  related image
    One-dimensional chains
  •  related image
    PARTICLE HYDROPHOBICITY
  •  related image
    PARTICLE MIXING RATIO
  •  related image
    Charged particles
  •  related image
    Decane
  •  related image
    Polystyrene
  •  related image
    WATER OIL CREAM
  •  related image
    Article
  •  related image
    Chemical composition
  •  related image
    Contact angle
  •  related image
    Crystal structure
  •  related image
    Crystallization
  •  related image
    Hydrophilicity
  •  related image
    Hydrophobicity
  •  related image
    Magnetism
  •  related image
    Particle size
  •  related image
    Priority journal
  •  related image
    Surface charge
  •  related image
    Surface property
  •  related image
    Wettability
  •  related image
    Zeta potential