Effect of solution parameters on pH-response of polyacrylic acid grafted polyimide smart membrane fabricated using 248 nm krypton fluoride excimer laser

Polymer ◽  
2021 ◽  
pp. 124181
Author(s):  
Renuka Subhash Patil ◽  
Erol Sancaktar
Keyword(s):  
Excimer Laser ◽  
Polyacrylic Acid ◽  
Krypton Fluoride ◽  
Ph Response ◽  
Solution Parameters

Krypton Fluoride Excimer Laser for Microlithography

1989 ◽  
Author(s):  
R. L. Sandstrom ◽  
R. P. Akins ◽  
U. K. Sengupta ◽  
C. Reiser ◽  
D. G. Larson ◽  
...  
Keyword(s):  
Excimer Laser ◽  
Krypton Fluoride

Advanced krypton fluoride excimer laser for microlithography

1992 ◽  
Author(s):  
Toshihiko Ishihara ◽  
Richard L. Sandstrom ◽  
Christopher Reiser ◽  
Uday K. Sengupta
Keyword(s):  
Excimer Laser ◽  
Krypton Fluoride

scholarly journals Bone cutting with high frequency krypton fluoride excimer laser

1994 ◽  
Vol 15 (Supplement) ◽  
pp. 451-454
Author(s):  
Hiroshi Fukuda ◽  
Kenji Hashimoto ◽  
Ichiro Yamada ◽  
Hajime Fujimaki ◽  
Mutsuhiko Murai ◽  
...  
Keyword(s):  
Excimer Laser ◽  
High Frequency ◽  
Krypton Fluoride

scholarly journals Acaricidal Activity of UV-C irradiation on Tetranychus urticae and eggs using pulsed krypton fluoride excimer laser

2021 ◽  
Author(s):  
Jean-Luc Gala ◽  
Ott Rebane ◽  
Jérôme Ambroise ◽  
Sergey Babichenko ◽  
Omar Nyabi ◽  
...  
Keyword(s):  
Light Source ◽  
Tetranychus Urticae ◽  
Excimer Laser ◽  
Exposure Time ◽  
Energy Output ◽  
Large Field ◽  
Krypton Fluoride ◽  
Post Irradiation ◽  
Wide Range ◽  
Uv C

Abstract Background While pulsed UV-C light sources such as excimer lasers are used in emerging non-thermal food decontamination method, they also have a high potential for a wide range of other microbial decontamination applications. The acaricidal effect of an experimental UV-C irradiation device was assessed using two-spotted spider mite female adults Tetranychus urticae and eggs as a model. Methods The UV-C light source was generated by a pulsed krypton fluoride (KrF) excimer laser operating at 248 nm emission wavelength. Pulse energy and pulse repetition rate were 5mJ, and up to 100Hz rate, respectively. Distance from light source to target was 150 mm with a target surface of 21.6 cm². The exposure time of the mite and fresh eggs varied from 1 to 4 minutes at a power of 300 mW. The post-irradiation acaricidal effects (mites’ mortality) were assessed immediately and measured 24 h post-irradiation. Effects on the hatchability of irradiated eggs were observed daily post-irradiation for up to 12 days. Results The mortality of mites observed with an energy amount of 5 and 40 mJ/mm² was 26% and 90%, respectively. The mortality at 80 mJ/mm² reached 99%. The effect of exposure duration on mortality was minimal. The effect of irradiation of eggs hatchability was even more important, with about 100% mortality with as little as 5 mJ/mm² for each exposure time. Conclusions A high mite mortality and lethal egg damage was already observed after less than 1 min exposure to UV-C pulsed irradiation. Pending further developments and feasibility studies, the current results and features of the UV-C generator (energy output modulation and applicability to varying spot sizes) open up a large field of germicidal applications requiring long-range radiation.

scholarly journals Study on the Mechanism of the Reversible Color Change of Polyacrylic Acid Modified Gold Nanoparticles Responding to pH

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3679
Author(s):  
Runmei Li ◽  
Caixia Zhang ◽  
Chen Wang ◽  
Yongjuan Cheng ◽  
Daodao Hu
Keyword(s):  
Gold Nanoparticles ◽  
Zeta Potential ◽  
Polyacrylic Acid ◽  
Color Change ◽  
Conformational Stability ◽  
Ph Response ◽  
Charge Variation ◽  
Vis Spectroscopy ◽  
Effects Of Ph ◽  
The Stability

In view of various explanations regarding the pH response of the nanocomposite of gold nanoparticles (AuNPs) modified with polyacrylic acid (PAA) molecules in reported literature, in this work, AuNPs with a size of 20 nm saturatedly loaded with PAA molecules (AuNPs-PAAs) were used to investigate the following aspects of this issue. We investigated the effects of pH on the stability of AuNPs-PAAs in the presence of salt, CTAB, poly (sodium styrenesulfonate) (PSS), ethanol, and free PAA, respectively. Common techniques were undertaken to evaluate the stability, including UV-Vis spectroscopy, Zeta potential analysis, and TEM. The results show that AuNPs-PAAs could respond to pH variations, having a reversible aggregation-to-disaggregation, accompanying their Zeta potential change. The proposed corresponding mechanism was that this reversible change was attributes to the net charge variation of AuNPs-PAAs induced by a reversible protonation-to-deprotonation of PAA rather than the conformational change. It was found that salt, CTAB, PSS, and free PAA could strengthen the dispersity of AuNPs-PAAs, even though their absolute Zeta potential values were decreased to small values or dropped to nearly zero. This abnormal phenomenon was explained by solvation. It was also found that AuNPs-PAAs have an opposite pH response in aqueous and ethanol solutions, justifying the solvation effect. All these results revealed the conformational stability of PAAs immobilized on AuNPs. The methods and the findings of this investigation give some new insights to understand the pH-response of AuNPs-PAAs composites and the design of AuNPs-PAAs-based functional sensors.

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