Intermediates and Mechanism of Photo-Oxygenation Reaction of Triethylamine

Tsubomura, Hiroshi; Yagishita, Teruo; Toi, Hiroo

doi:10.1246/bcsj.46.3051

Cited by 32 publications

(7 citation statements)

References 7 publications

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“…Such a change corresponds to the formation of CTOAu, RNH 3 + AuCl 4 - . A new peak of carbonyl stretching vibration (ν = 1744 cm -1 ) was noticed after UV photolysis . These observations are in accordance with the changes of the C(1s), N(1s), and O(1s) bands in the XPS spectra.…”

Section: Discussionsupporting

confidence: 85%

Aggregation of Photolytic Gold Nanoparticles at the Surface of Chitosan Films

Miyama

Yonezawa

2004

Langmuir

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Formation and aggregation of photolytic gold nanoparticles at the surface of chitosan (CTO) films have been investigated. When thin films of chloroauric acid salt of CTO were irradiated with UV light in wet air at room temperature for 10 min, gold nanoparticles of ∼10 nm size are formed at the film surface. Detailed X-ray photoelectron spectroscopy (XPS) study and field emission type scanning electron microscopy (FE-SEM) observation have been carried out to characterize gold nanoparticles at the film surface. The shift of Au(4f) peak to the higher energy side and broadening of full width at half-maximum in the XPS spectrum are the direct evidence of the existence of gold atoms and small clusters in the early stage of photolysis. According to FE-SEM observation, growth in the particle diameter and aggregation of nanoparticles were observed after prolonged irradiation, and, finally, the film surface was densely covered with gold particles of 20−100-nm size. Gold atoms and clusters could move in the film and precipitate to the irradiated surface. Chemical composition analysis further suggests that gold particles at the surface are covered with an ultrathin CTO layer, which is partly oxidized by oxygen and chlorinated by chlorine during photochemical reactions.

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Section: Discussionsupporting

confidence: 85%

Aggregation of Photolytic Gold Nanoparticles at the Surface of Chitosan Films

Miyama

Yonezawa

2004

Langmuir

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“…On the basis of these results and the complex formation of amine with oxygen reported by Tsubomura et al 13 we propose the following mechanism for the oxygen-accelerated photopolymerization of MMA in the presence of amines. The C-T complex of an amine In order to conÐrm the mechanism, TEA was preirradiated under oxygen before the monomer was introduced.…”

Section: Resultssupporting

confidence: 73%

Rate enhancement of amines in the photopolymerization of methyl methacrylate under oxygen

Sato¹,

Kurihara²,

Takeishi³

1998

Polym. Int.

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“…DPIHFP then forms unstable diaryl iodine free radicals. [ 55 ] Amines assist the polymerization reaction by forming a charge‐transfer complex with dissolved oxygen, [ 56 ] which converts into a hydroperoxide, consuming oxygen and generating further radical species after decomposing. [ 57 ] Through the consumption of oxygen, this process also attenuates radical inhibition.…”

Section: New Experimentsmentioning

confidence: 99%

Sensitive Photoresists for Rapid Multiphoton 3D Laser Micro‐ and Nanoprinting

Wegener

Hahn

Nardi

et al. 2020

Advanced Optical Materials

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parallel projection technologies, [6-8] computed axial lithography as an inverse tomography approach based on multiple 2D optical one-photon exposures from multiple different directions, [9,10] and different forms of multiphoton-absorption 3D printing, [11-16] mostly based on femtosecond or picosecond pulsed lasers. Twophoton lithography has been pioneered by Maruo et al. in 1997. [17] In a few exceptions, continuous-wave (cw) lasers have been used. [18,19] Going "faster" can mean scanning a single focus faster, [20] adapting multiple foci approaches, [21,22] scanning multiple foci faster, [3] or printing more voxels/ pixels in parallel per unit time in projection-based approaches without scanning in the focal plane, [6,7,9,10,12] yet scanning normal to the focal plane. In any case, increasing the printing rate is inherently connected to either using more laser power and the same photoresist, or to using comparable or less laser power by exploiting optimized more sensitive photoresists. As femtosecond or picosecond laser power is a precious commodity associated with a considerable fraction of the cost of most advanced 3D multiphoton laser printers, we dedicate the main part of this contribution to a screening of sensitive multiphoton-absorption-based photo resists. These photoresists are either taken from the published literature, reproduced and remeasured in our labs, or are newly investigated herein as promising candidates. Driven by recent advances in rapid multiphoton single-focus 3D laser nanoprinting, multifocus variants thereof, and projection-based multiphoton 3D laser nanoprinting, the necessary average total laser powers from femtosecond laser oscillators or even from amplified femtosecond laser systems have exceeded the Watt level. Aiming at ever faster 3D printing, there exist two options: Using yet more powerful lasers or searching for more sensitive photoresists allowing for higher speeds at comparable or lower power levels. Here, altogether more than 70 different photoresists from the literature and a few new candidates are reviewed with regard to effective multiphoton sensitivity. A dimensionless sensitivity figure-of-merit allows to directly compare data taken under sometimes vastly different conditions.

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Intermediates and Mechanism of Photo-Oxygenation Reaction of Triethylamine

Cited by 32 publications

References 7 publications

Aggregation of Photolytic Gold Nanoparticles at the Surface of Chitosan Films

Aggregation of Photolytic Gold Nanoparticles at the Surface of Chitosan Films

Rate enhancement of amines in the photopolymerization of methyl methacrylate under oxygen

Sensitive Photoresists for Rapid Multiphoton 3D Laser Micro‐ and Nanoprinting

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