PMID- 17880252
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20071220
LR  - 20071016
IS  - 0743-7463 (Print)
IS  - 0743-7463 (Linking)
VI  - 23
IP  - 22
DP  - 2007 Oct 23
TI  - Azo polymer microspherical cap array: soft-lithographic fabrication and 
      photoinduced shape deformation behavior.
PG  - 11266-72
AB  - In this work, azo polymer microspherical cap arrays possessing unique 
      photoprocessible properties have been fabricated through a soft-lithographic 
      contact printing approach. In the process, hexagonal polystyrene (PS) colloidal 
      arrays, obtained by the vertical deposition method, were used as masters. 
      Poly(dimethylsiloxane) (PDMS) stamps with aligned hemisphere air voids on the 
      surfaces were obtained by casting the precursor against the colloidal arrays. By 
      using the stamps and a solution of an epoxy-based azo polymer (BP-AZ-CA) as 
      "ink", the microspherical cap arrays were fabricated by pressing the "inked" 
      surfaces against substrates. Uniform 2D arrays of the submicrometer spherical 
      caps could be obtained on the substrates after peeling off the stamps and drying. 
      The characteristic sizes of the arrays depended on some adjustable features, such 
      as the diameters of PS spheres and concentrations of the "inks" used in the 
      process. After exposure to a linearly polarized Ar+ laser single beam, the 
      spherical caps could be stretched along the polarization direction, and the 
      arrays were consequently transformed into ellipsoidal cap arrays. Upon 
      irradiation of interfering p-polarized Ar+ laser beams, only the spherical caps 
      in the bright fringes were deformed by the light irradiation, which resulted in 
      more complicated surface relief patterns. The observation gives another 
      well-defined example of the photoinduced mass migration in the submicrometer 
      scale. The approach can potentially be applied to fabrication of microlens arrays 
      with different converging rate in two directions.
FAU - Liu, Bin
AU  - Liu B
AD  - Department of Chemical Engineering, Laboratory for Advanced Materials, Tsinghua 
      University, Beijing, 100084, P. R. China.
FAU - He, Yaning
AU  - He Y
FAU - Fan, Pengwei
AU  - Fan P
FAU - Wang, Xiaogong
AU  - Wang X
LA  - eng
PT  - Journal Article
DEP - 20070920
PL  - United States
TA  - Langmuir
JT  - Langmuir : the ACS journal of surfaces and colloids
JID - 9882736
EDAT- 2007/09/21 09:00
MHDA- 2007/09/21 09:01
CRDT- 2007/09/21 09:00
PHST- 2007/09/21 09:00 [pubmed]
PHST- 2007/09/21 09:01 [medline]
PHST- 2007/09/21 09:00 [entrez]
AID - 10.1021/la7016402 [doi]
PST - ppublish
SO  - Langmuir. 2007 Oct 23;23(22):11266-72. doi: 10.1021/la7016402. Epub 2007 Sep 20.