Hailin Fan

Publications (2)3.07 Total impact

• Article: Investigation on solvent casting films of surfactant-encapsulated clusters.

  Weifeng Bu, Lixin Wu, Xueliang Hou, Hailin Fan, Changwen Hu, Xi Zhang
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  ABSTRACT: The surfactant-encapsulated cluster (SEC) composed of a hydrophobic dimethyl dioctadecyl ammonium (DODA) shell and an encapsulated hydrophilic polyoxoanion core can form casting films. The structure of the casting film is influenced by evaporation rates of organic solvent. When the casting films are prepared by slow evaporation of chloroform, the alkyl chains are considered to possess a partial interdigitation, and the interdigitated length is 1.6 nm. The casting film structure is characterized by scanning force microscopy (SFM), Fourier transformation infrared (FT-IR), wide-angle X-ray diffraction, and differential scanning calorimetry (DSC).
  Journal of Colloid and Interface Science 08/2002; 251(1):120-4. · 3.07 Impact Factor
• Article: Surfactant-Encapsulated Polyoxoanion:  Structural Characterization of Its Langmuir Films and Langmuir−Blodgett Films

  Weifeng Bu, Hailin Fan, Lixin Wu, Xueliang Hou, Changwen Hu, Gang Zhang, Xi Zhang
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  ABSTRACT: We synthesized a surfactant-encapsulated polyoxoanion, (DODA)16As4W30Cu4O112·114H2O (denoted SEC-1), which possesses a hydrophobic dimethyl dioctadecylammonium (DODA) shell and an encapsulated hydrophilic polyoxoanion core in organic phases. The novel organic/inorganic composite can form stable Langmuir monolayers, but it is significantly distorted when spread onto an air/water interface although the general core−shell structure seems to remain. Langmuir−Blodgett (LB) films of SEC-1 are readily prepared by transferring the monolayers onto substrates with a transfer ratio near 1. It has been proposed that there exist well-orientated alkyl chains and highly defined layer structure in LB films. Fourier transformation infrared spectroscopy at different temperatures indicates that two obvious phase transitions appear near 34 and 47 °C for multilayer LB films of SEC-1. The polyoxoanion can be organized to some extent within LB films with its long axis parallel to the substrate by comparing the IR transmission spectrum with the reflection−absorption spectrum. The one-monolayer LB film of SEC-1 possesses a homogeneous and flat surface morphology, and a water contact angle of 104 ± 3° for odd-layer LB films shows a highly hydrophobic surface.
  07/2002;