Influences of solution plasma conditions on degradation rate and properties of chitosan

Tantiplapol, T.; Singsawat, Y.; Narongsil, N.; Damrongsakkul, Siriporn; Saito, Nagahiro; Prasertsung, Isarawut

doi:10.1016/j.ifset.2015.09.014

Cited by 43 publications

(14 citation statements)

References 23 publications

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“…Moreover, it is difficult to obtain polymer nanoparticles with uniform size due to the small contact surface area and unstable discharge. To obtain a uniform size of polymer nanoparticles via the conventional SPP method, it is very important to increase the contact surface area and to produce the stable discharge [28,29]. Therefore, in this work, we propose an advanced SPP with an injected gas bubble channel to increase the contact surface area and to produce a stable discharge during the electrochemical plasma synthesis of PANI nanoparticles from the aniline monomer solution in SPP devices.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a Polyaniline Nanoparticle Using a Solution Plasma Process with an Ar Gas Bubble Channel

et al. 2019

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This work researched polymerization of liquid aniline monomer by solution plasma with a gas bubble channel and investigated characteristics of solution plasma and polyaniline (PANI). The injected gas bubble channel in the proposed solution plasma process (SPP) played a significant role in producing a stable discharge in liquid aniline monomer at a low voltage and furthermore enhancing the contact surface area between liquid aniline monomer and plasma, thereby achieving polymerization on the boundary of the liquid aniline monomer and plasma. Solution plasma properties were analyzed with voltage–current, optical emission spectroscopy, and high-speed camera. Conductivity, percentage yield, and firing voltage of PANI nanoparticle dispersed solution were measured. To investigate the characteristics of synthesized PANI nanoparticles, field emission scanning electron microscopy, dynamic light scattering, transmission electron microscopy, selective area electron diffraction (SAED) pattern, Fourier transform infrared spectroscopy (FTIR), gel permeation chromatography, 1H-nuclear magnetic resonance (1H-NMR), and X-ray photo spectroscopy (XPS) were examined. The FTIR, 1H-NMR, and XPS analysis showed the PANI characteristic peaks with evidence that some quinoid and benzene rings were broken by the solution plasma process with a gas bubble channel. The results indicate that PANI nanoparticles have a spherical shape with a size between 25 and 35 nm. The SAED pattern shows the amorphous pattern.

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Section: Introductionmentioning

confidence: 99%

Synthesis of a Polyaniline Nanoparticle Using a Solution Plasma Process with an Ar Gas Bubble Channel

et al. 2019

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“…In this study, a bipolar pulsed-type power supply was applied, and the energy (E) supplied to the tungsten electrode per second may be expressed as the energy per pulse (E p ) × frequency. As the frequency increases, the energy supplied to the plasma field increases, thereby increasing the generation of chemically active species in the plasma field-particularly hydroxyl radicals [19,20]. The emission intensities of the hydroxyl radicals shown in Figure 1d were measured at 21 kHz (0.81 × 10 4 ), 24 kHz (1.21 × 10 4 ), 27 kHz (1.56 × 10 4 ), and 30 kHz (2.48 × 10 4 ).…”

Section: Effect Of the Plasma Operating Conditionsmentioning

confidence: 99%

“…to the tungsten electrode per second may be expressed as the energy per pulse (Ep) × frequency. As the frequency increases, the energy supplied to the plasma field increases, thereby increasing the generation of chemically active species in the plasma field-particularly hydroxyl radicals [19,20]. The emission intensities of the hydroxyl radicals shown in Figure 1d Figure 1e shows the change in the decomposition efficiency of ASA using a pulse width of 2 μs to 5 μs, where the applied frequency and voltage were maintained at 30 kHz and 250 V, respectively.…”

Section: Effect Of the Plasma Operating Conditionsmentioning

confidence: 99%

Assessment of Degradation Behavior for Acetylsalicylic Acid Using a Plasma in Liquid Process

et al. 2019

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Acetylsalicylic acid (ASA) is a pharmacologically active compound. In this study, ASA was decomposed effectively using a plasma in liquid phase process with hydrogen peroxide and TiO2 photocatalyst. Increasing the electrical power conditions (frequency, applied voltage, and pulse width) promoted plasma generation, which increased the rate of ASA decomposition. The added hydrogen peroxide increased the rate of ASA degradation, but injecting an excess decreased the degradation rate due to a scavenger effect. Although there was an initial increase in the decomposition efficiency by the addition of TiO2 powder, the addition of an excessive amount inhibited the generation of plasma and decreased the degradation rate. The simultaneous addition of H2O2 and TiO2 powder resulted in the highest degradation efficiency. We suggest that ASA is converted to salicylic acid through demethylation by hydroxyl radicals and is finally mineralized to carbon dioxide and water via 2,4-dihydroxy benzoic acid and low molecular acids.

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“…The diffraction peak at 11.6 in the XRD patterns of the CSGH disappeared but the peak at 20.8 was much broader with a much lower peak intensity. This is because plenty of hydroxyl and amino groups exist in the chitosan structure, which can form stronger intermolecular and intramolecular hydrogen bonds, and the structure of chitosan molecules has certain regularity, so that chitosan molecules form crystalline regions easily, 55 but the introduction of biguanide groups destructed the intermolecular hydrogen bonds and the crystalline regions of chitosan. Furthermore, the characteristic peak at 36.7 claried the existence of biguanide, which suggested the successful fabrication of CSGH.…”

Section: Characterization Of Chitosan and Csghmentioning

confidence: 99%

Microwave-assisted synthesis of chitosan biguanidine hydrochloride and its regulation on InsR and GLUT2 in insulin resistant HepG2 cells

et al. 2017

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Influences of solution plasma conditions on degradation rate and properties of chitosan

Cited by 43 publications

References 23 publications

Synthesis of a Polyaniline Nanoparticle Using a Solution Plasma Process with an Ar Gas Bubble Channel

Synthesis of a Polyaniline Nanoparticle Using a Solution Plasma Process with an Ar Gas Bubble Channel

Assessment of Degradation Behavior for Acetylsalicylic Acid Using a Plasma in Liquid Process

Microwave-assisted synthesis of chitosan biguanidine hydrochloride and its regulation on InsR and GLUT2 in insulin resistant HepG2 cells

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