1 Advanced Control of Photochemical Reactions …
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Fig. 1.21 a Structures and absorption spectra of colorless closed form (CF) and colored transoidcis form (TC) of PQ. b Time evolution of the optical transmission image of a polymer microparticle
with PQ before, during, and after UV exposure. c Time trace of the Z-position of the polymer
microparticle whose images are shown in (b). d Z-displacement of PQ-PAE as a function of UV
intensity for 532 and 690-nm trapping lasers. e Time evolution of the optical transmission image
of a polymer microparticle with PQ before, during, and after photo-irradiation with a focused UV
laser. The focal point is on the left-hand side of the particle. f Time trace of the X- and Y-positions
of the polymer microparticle whose images are shown in (e). Reprinted with permission from Ref.
[34]. Copyright (2018) American Chemical Society
colored form returns to the colorless form by the thermal reaction at room temperature
with the time constant of 0.7 s in solution [35].
Figures 1.21b, c show the temporal evolution of the trapping behavior of the
polyacrylic ester resin (PAE) microparticle containing PQ (PQ-PAE) which is trapped
in water with CW 690-nm laser light. The UV light at 355 nm was turned ON at
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Fig. 1.21 a Structures and absorption spectra of colorless closed form (CF) and colored transoidcis form (TC) of PQ. b Time evolution of the optical transmission image of a polymer microparticle
with PQ before, during, and after UV exposure. c Time trace of the Z-position of the polymer
microparticle whose images are shown in (b). d Z-displacement of PQ-PAE as a function of UV
intensity for 532 and 690-nm trapping lasers. e Time evolution of the optical transmission image
of a polymer microparticle with PQ before, during, and after photo-irradiation with a focused UV
laser. The focal point is on the left-hand side of the particle. f Time trace of the X- and Y-positions
of the polymer microparticle whose images are shown in (e). Reprinted with permission from Ref.
[34]. Copyright (2018) American Chemical Society
colored form returns to the colorless form by the thermal reaction at room temperature
with the time constant of 0.7 s in solution [35].
Figures 1.21b, c show the temporal evolution of the trapping behavior of the
polyacrylic ester resin (PAE) microparticle containing PQ (PQ-PAE) which is trapped
in water with CW 690-nm laser light. The UV light at 355 nm was turned ON at