Determination of photoisomerization parameters for a PMMA thin film doped with disperse orange 3

Yang, Weiping; Ho, J.C.; Shim, Hong‐Ku; Seo, Hyo Jin; Kim, Sun Il

doi:10.1016/j.optmat.2017.09.027

Cited by 7 publications

(5 citation statements)

References 43 publications

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“…UV-VIS spectra were recorded for different times of irradiation and accumulated time of irradiation is given. Mono-exponential absorbance decay was fitted using the following formula [ 37 ]:

where, A PSS is absorbance of material in photo-stationary state and p is photoisomerization rate.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Physico-Chemical and Light-Induced Properties of Quinoline Azo-dyes Polymers

Chomicki

Kharchenko

Skowroński

et al. 2020

IJMS

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We present investigation of optical and photochromic properties as well as of surface quality of thin films of novel methacrylic polymers with 8-hydroxyquinoline azo-dyes in side-chain. Additionally, thermal stability of polymer powders was examined and their glass transition temperature was determined. Optical properties (extinction coefficient and refractive index) were determined by spectroscopic ellipsometry (SE) combined with absorbance measurements. Photoresponsive behavior was investigated by determination of photoisomerization rates under irradiation with unpolarized 365 nm light, as well as by conduction of holographic grating inscription experiment. Thin film quality was determined by atomic force microscopy (AFM) measurements. Thermal analysis was performed by thermogravimetric (TG), derivative thermogravimetric (DTG) and differential scanning calorimetry (DSC) measurements. We found that optical properties as well as photoisomerization rates of investigated polymers are dependent on the substituent in the para position of the phenyl ring. Surface relief grating inscription was successfully generated only for materials with chromophores containing dimethylamino (N(CH3)2) and methyl (CH3) substituents, but all materials exhibited birefringence grating in the bulk. Surface of most thin films was very smooth, but its quality was impaired by neutral (H) as well as carboxyl (COOH) substituent. Thermal stability of copolymers with side-chain chromophores was improved compared to pure poly(methyl methacrylate) (PMMA).

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“…UV-VIS spectra were recorded for different times of irradiation and accumulated time of irradiation is given. Mono-exponential absorbance decay was fitted using the following formula [ 37 ]:

where, A PSS is absorbance of material in photo-stationary state and p is photoisomerization rate.…”

Section: Methodsmentioning

confidence: 99%

“…UV-VIS spectra were recorded for different times of irradiation and accumulated time of irradiation is given. Mono-exponential absorbance decay was fitted using the following formula [37]:…”

Section: Light-responsive Behavior Measurementsmentioning

confidence: 99%

Physico-Chemical and Light-Induced Properties of Quinoline Azo-dyes Polymers

Chomicki

Kharchenko

Skowroński

et al. 2020

IJMS

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“…The speed and efficiency of the droplet operations are greatly influenced by these parameters. The rate of isomeric conversion is mathematically modeled [28,29] by the equation( 1),…”

Section: Led Characterizationmentioning

confidence: 99%

“…explicitly states that the rate of isomerization (p) is directly proportional to the intensity of the light source (I) [28]. Semiconductor devices like LED employ driving current (mA) as an independent variable to control the intensity of light irradiation.…”

Section: Led Characterizationmentioning

confidence: 99%

On-chip mixing of cancer cells and drug using LED enabled 2D opto-wetting droplet platforms

Thomas

Govindharaj

Unni

et al. 2023

Biomed. Phys. Eng. Express

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Droplets of microliter size serve as miniaturized reaction chambers for practical lab on a chip (LoC) applications. The transportation and coalescence of droplets are indispensable for realizing microfluidic mixing. Light can be used as an effective tool for droplet manipulation. We report a novel platform for LED-based transport and mixing of cell-encapsulated microdroplets for evaluating dose response of cancer drugs. Microcontroller enabled LEDs (Light-emitting diodes) were used to actuate droplet movement on Azobenzene coated planar silicon substrates. Droplet transport was initiated by the spatial gradient in solid-liquid interfacial tension developed through LED triggered photoisomerization of Azobenzene substrate. Detailed UV-Visible characterization of Azobenzene molecule was performed for different LED light intensity and wavelength. A complete standalone opto-wetting toolbox was developed by integrating various components such as a microcontroller, UV LED (385nm), blue LED (465nm), and Azobenzene coated photoresponsive substrate. 2D transport of DI water droplets (10 -30 μL) along simple trajectories was demonstrated using this device. Subsequently, the proposed opto-wetting platform was used for performing drug evaluation through on-chip mixing of droplets containing cancer cells (A549 – Lung cancer cells) and cancer drug (paclitaxel). Separate cell viability analysis was performed using MTT assays, where the cytotoxic effects of Azobenzene and UV light (385nm) on A549 cells were studied. Dosage response of paclitaxel drug was studied using both MTT (3-(4, 5-Dimethylthiazolyl-2)-2, 5-diphenyltetrazolium bromide) and live-dead cell assays. The results obtained indicate the potential use of our device as a cost-effective, reliable opto-wetting microfluidic platform for drug screening experiments.

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“…Organic molecules with asymmetric structure such as Disperse Red 1 (DR1), Disperse Red 19 (DR 19) and have been developed for increasing the novel properties of the material in order to fulfill the requirements for photonic application [ 1,2,3]. Disperse Orange 3 (DO3) molecule have been used as a chromophore which is incorporated within polymer matrix such as PMMA [4,5]. This molecule is known as conjugated organic molecules and interesting materials because of their structures and their electronic, optical properties [6,7].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Disperse Orange 3 Thin Film Produced by PVD Method for Photonic Application

Taunaumang

Rumampuk

Silangen

2023

Advances in Science and Technology

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Fabrication of Disperse Orange 3 thin film for photonics technology application has been carried out by using PVD method. The molecular structure of this film have been investigated by using FTIR and also by IRRAS methods. The optical properties have been investigated by UV-VIS measurement. In this paper the effect of molecular orientation and the molecular stcking/arrangement within the thin film were discussed.

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Determination of photoisomerization parameters for a PMMA thin film doped with disperse orange 3

Cited by 7 publications

References 43 publications

Physico-Chemical and Light-Induced Properties of Quinoline Azo-dyes Polymers

Physico-Chemical and Light-Induced Properties of Quinoline Azo-dyes Polymers

On-chip mixing of cancer cells and drug using LED enabled 2D opto-wetting droplet platforms

Characteristics of Disperse Orange 3 Thin Film Produced by PVD Method for Photonic Application

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