Characterization of high-density polyethylene using laser-induced fluorescence (LIF)

Htun, M. Than

doi:10.1007/s10965-012-9823-7

Cited by 9 publications

(9 citation statements)

References 18 publications

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“…In general, the emission intensity (with same wavelength) of the PVA/CNF/CQDs films is higher than that of the PVA/CQDs composites, indicating that introducing CNF into the With the increase of CQDs content from 0 to 4 mL, the light intensity of emission waves with a wavelength of 375-410 nm emitted by the films gradually decreases, showing that the CQDs content has a significant effect on the attenuation of the fluorescence intensity of composites, which is consistent with the result of Ling [55]. One possible reason is due to the increase of electron-withdrawing group (carbonyl group) in the films, which can weaken the fluorescence [54]. Another possibility may be due to the π → π * and n → π * electron transitions to improve after doping CQDs in PVA, PVA/CNF films (No.…”

Section: Optical Performance Of the Prepared Pva-based Filmssupporting

confidence: 85%

“…Moreover, the fluorescence spectra are clearly visible with convex peaks in the emission wavelength of 375 to 450 nm, which is the lipid oxidation fluorescence peak. The reason is that 2p2 nonbonding electrons of the oxygen atom occur n → π * electron transition in the free hydroxyl group of the molecular conformation of PVA [54]. From this, we conclude that PVA-based films dopes with CNF and CQDs.…”

Section: Pl Property Of the Prepared Pva-based Filmsmentioning

confidence: 74%

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Preparation and Performance of Radiata-Pine-Derived Polyvinyl Alcohol/Carbon Quantum Dots Fluorescent Films

Zhang

Pan

et al. 2019

Materials

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In this study, the low-cost processing residue of Radiata pine (Pinus radiata D. Don) was used as the lone carbon source for synthesis of CQDs (Carbon quantum dots) with a QY (The quantum yield of the CQDs) of 1.60%. The CQDs were obtained by the hydrothermal method, and +a PVA-based biofilm was prepared by the fluidized drying method. The effects of CQDs and CNF (cellulose nanofibers) content on the morphology, optical, mechanical, water-resistance, and wettability properties of the PVA/CQDs and PVA/CNF/CQDs films are discussed. The results revealed that, when the excitation wavelength was increased from 340 to 390 nm, the emission peak became slightly red-shifted, which was induced by the condensation between CQDs and PVA. The PVA composite films showed an increase in fluorescence intensity with the addition of the CNF and CQDs to polymers. The chemical structure of prepared films was determined by the FTIR spectroscopy, and no new chemical bonds were formed. In addition, the UV transmittance was inversely proportional to the change of CQDs content, which indicated that CQDs improved the UV barrier properties of the films. Furthermore, embedding CQDs Nano-materials and CNF into the PVA matrix improved the mechanical behavior of the Nano-composite. Tensile modulus and strength at break increased significantly with increasing the concentration of CQDs Nano-materials inside the Nano-composite, which was due to the increased in the density of crosslinking behavior. With the increase of CQDs content (>1 mL), the water absorption and surface contact angle of the prepared films decreased gradually, and the water-resistance and surface wettability of the films were improved. Therefore, PVA/CNF/CQDs bio-nanocomposite films could be used to prepare anti-counterfeiting, high-transparency, and ultraviolet-resistant composites, which have potential applications in ecological packaging materials. IntroductionPolyvinyl alcohol (PVA) is a kind of semi-crystalline polymer with a linear structure and strong hydrogen bonds intermolecular. It has been widely used in papermaking [1], textiles [2], coatings [3], adhesives [4], packaging [5], and biomedicine [6] because of its toughness [7], adhesiveness [8], biocompatibility [9], swelling behavior [10], lack of toxicity [11], and sufficient thermal stability; it is also odorless and tasteless. However, PVA is highly hydrophilic and water-soluble [12], and its light transmittance is not suitable for light-barrier packaging [13]. In order to expand the application of PVA, much attention has been paid to fabricating functional PVA composites. The existence of hydrogen-bonding groups in PVA structure and the ability to form hydrogen bonds makes PVA suitable for mixing with other materials to improve its functional properties [14,15]. In previous studies, the prepared silica in situ enhanced PVA/chitosan biodegradation films [16], PVA/tea polyphenol composite films [17], PVA reinforced with cellulose nanocrystals or cellulose nanofibers (CNF) [18], and CNF/PVA-borax hybrid foams [19] had...

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Section: Optical Performance Of the Prepared Pva-based Filmssupporting

confidence: 85%

Section: Pl Property Of the Prepared Pva-based Filmsmentioning

confidence: 74%

Preparation and Performance of Radiata-Pine-Derived Polyvinyl Alcohol/Carbon Quantum Dots Fluorescent Films

Zhang

Pan

et al. 2019

Materials

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“…These groups are typical of materials such as vinylic glue and are present in polymers based on chains of methylene groups (as polyethylene and polypropylene) due to the oxidation that naturally occurs in air. 4,5 The weak band at 440 nm present in the fluorescence spectrum of some of the studied materials can be considered due to a charge-transfer complex of the polymer chain with oxygen. 4 The large amount of bands present makes it difficult to directly recognize the material classes and comprehend the most indicative fluorescence emissions.…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3] So far, few papers deal with the applications of LIF to the characterization and recognition of commercial plastic materials. [4][5][6][7][8] In particular, the most attention has given to the study of high-density polyethylene (HDPE) and of its degradation, also due to its importance in the applicative and commercial field.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Discrimination of Plastic Materials Using Laser-Induced Fluorescence

et al. 2016

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The most meaningful spectral components in laser-induced fluorescence (LIF) spectra for several different commercial plastics have been individuated and used to automatically discriminate among different plastic materials and between plastics and complex organic materials, such as woods. Starting from LIF measurements on known samples, a number of significant wavelengths have been identified by principal component analysis (PCA). These have been used to produce intensity ratios functional to the discrimination. Threshold values for such ratios have been individuated in order to obtain an automatic recognition of plastics. The work done has been preparatory to the design and development of a multispectral imaging LIF system for fast detection of plastic debris in a post-blast scene.

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“…LIDAR systems have distinct advantages over passive systems of ocean colour radiometry: they can be used day and night, at low solar angles, and can provide depth-resolved information through the water column. LIDAR techniques based on inelastic processes such as fluorescence or Raman scattering represent particularly promising remote sensing techniques for plastic identification [67][68][69].…”

Section: Active Sensors: Lidar and Radarmentioning

confidence: 99%

Measuring Marine Plastic Debris from Space: Initial Assessment of Observation Requirements

et al. 2019

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Sustained observations are required to determine the marine plastic debris mass balance and to support effective policy for planning remedial action. However, observations currently remain scarce at the global scale. A satellite remote sensing system could make a substantial contribution to tackling this problem. Here, we make initial steps towards the potential design of such a remote sensing system by: (1) identifying the properties of marine plastic debris amenable to remote sensing methods and (2) highlighting the oceanic processes relevant to scientific questions about marine plastic debris. Remote sensing approaches are reviewed and matched to the optical properties of marine plastic debris and the relevant spatio-temporal scales of observation to identify challenges and opportunities in the field. Finally, steps needed to develop marine plastic debris detection by remote sensing platforms are proposed in terms of fundamental science as well as linkages to ongoing planning for satellite systems with similar observation requirements.

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Characterization of high-density polyethylene using laser-induced fluorescence (LIF)

Cited by 9 publications

References 18 publications

Preparation and Performance of Radiata-Pine-Derived Polyvinyl Alcohol/Carbon Quantum Dots Fluorescent Films

Preparation and Performance of Radiata-Pine-Derived Polyvinyl Alcohol/Carbon Quantum Dots Fluorescent Films

Characterization and Discrimination of Plastic Materials Using Laser-Induced Fluorescence

Measuring Marine Plastic Debris from Space: Initial Assessment of Observation Requirements

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