Dynamics of single-layer polymer breath figures.

Department of Physics, National Sun Yat-sen University, Kaohsiung, 804, Taiwan.
Optics Express (Impact Factor: 3.53). 08/2010; 18(17):18464-70. DOI: 10.1364/OE.18.018464
Source: PubMed

ABSTRACT A single-layer of breath figure pattern was explored via the dynamical optical images and the temperature evolution. The pattern was prepared with the solution of carbon disulfide (CS(2)) dissolved 1% weight concentration of polystyrene. The evaporation of CS(2) was considered to be the most important role to the formation of the breath figure pattern. The understanding of the breath figures pattern will promote the technique to fabricating an imprinted template with demanded hexagonal structures.

  • [Show abstract] [Hide abstract]
    ABSTRACT: A breath figure (BF) is the water droplet array that forms when moisture comes in contact with a cold substrate. This water droplet array has been widely utilized in the past two decades as a versatile soft template for the fabrication of polymeric porous films. Accordingly, the ordered pores on the polymer films formed with such a method are named a breath figure array (BFA).The BF templating technique is undergoing rapid development. Several unconventional BF processes have been established to prepare porous films with unique morphologies or primary materials, and various newly developed functionalization techniques have significantly improved the performance of polymeric films with BFA, leading to novel applications, including templates, biosensors, and separation membranes. These recent achievements will be described in this Minireview.
    Angewandte Chemie International Edition 10/2013; 52(47). · 11.34 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Polysulfone membranes having highly ordered pores in uniform micron size range were fabricated using breath figure (BF) templating in combination with phase separation. Specifically, membranes with average pore opening of 1.5 µm, 2.5 µm, 2.8 µm and 3.4 µm and tubular pore cross-sections were prepared. Different solvent systems, dilutions and casting conditions were tested to realize BF templating for fabrication of microporous membranes with controlled and uniform pore sizes. PSF dissolved in a solvent-nonsolvent pair of dichloromethane and tertiary amyl alcohol at 6–10% (w/v) concentration cast at 85–95% relative humidity and 30 °C resulted in microporous membranes with uniform monodispersed, nearly hexagonally packed pore openings. The cross-sections revealed tubular channels or macrovoids followed by closed or interconnected cellular structure formed due to phase separation. In absence of internal nonsolvent BF templating could occur only in very dilute solution. The work also underscores need for immiscibility of casting solvents with water.
    Journal of Membrane Science 12/2014; 471:201-210. · 4.91 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Since its introduction in 1994, the preparation of ordered porous polymer films by the breath figure (BF) method has received a considerable interest. The so-called “honeycomb” (HC) films exhibit a hexagonal array of micrometric pores obtained by water droplet condensation during the fast solvent evaporation performed under a humid flow. The main focus of this feature article is to describe the recent advances in the design of honeycomb polymer films by the BF process. We first review the recent studies related to the honeycomb film formation through the exploration of different parameters such as the relative humidity, the polymer concentration, the drying rate, the substrate or the role of interfacial tension. The influence of the architecture and microstructure of the polymer is examined through examples. In this contribution, a special attention is given to the recent articles focused on the preparation of elaborate functional honeycomb-structured polymer films obtained via the simple BF method. In this context, we review the preparation of hierarchical HC films showing either sub- or super-structure, the formation of hybrid HC films by self-assembly of nanoparticles or in situ generation of the inorganic matter, the fluorescence in HC films introduced either by a fluorescent polymer or by fluorescent chemical groups, the elaboration of biomaterials from HC films decorated by glycopolymer and/or showing sensing ability and finally the design of functional polymeric surfaces with either stimuli-responsive or superhydrophobic properties.
    European Polymer Journal 06/2012; 48(6):1001–1025. · 3.24 Impact Factor