Applications of NIR Techniques in Polymer Coatings and Synthetic Textiles

Scherzer, Tom

doi:10.1007/978-981-15-8648-4_21

Cited by 6 publications

(6 citation statements)

References 47 publications

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“…Long carbon chains and polymers absorb infrared light, particularly those with aromatic rings, as found in sMO. 33,34 Since IR is the heat-carrying radiation of the solar spectrum, the higher the reflectivity of the coatings in the IR region, the lower the absorption and hence the better the thermal insulation observed. Thus, the observed high thermal insulation effect in the studied epoxy nanocomposite coatings was due to the synergistic effect of the HMS and MO particles.…”

Section: Resultsmentioning

confidence: 99%

“…The stearic acid modification of the sMO particles influenced its intrinsic reflectivity and was responsible for the modest decrease in the reflectivity of sMO-containing coatings compared to those containing MO nanoparticles. Long carbon chains and polymers absorb infrared light, particularly those with aromatic rings, as found in sMO. , Since IR is the heat-carrying radiation of the solar spectrum, the higher the reflectivity of the coatings in the IR region, the lower the absorption and hence the better the thermal insulation observed.…”

Section: Resultsmentioning

confidence: 99%

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Corrosion-Resistant Hydrophobic Thermal Barrier Composite Coating on Metal Strip: A New Dimension to Steel Strips for Roofing Segment

Ananthapadmanabhan,

Rout,

Chatterjee

et al. 2023

ACS Appl. Mater. Interfaces

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This study demonstrates a cost-effective, thin, multifunctional composite coating system with outstanding thermal insulation for thermal management and heat shield applications, such as roofs, as well as outstanding resistance to corrosion. The hydrophobic multifunctional epoxy composite coating systems were designed with surface-modified fillers to impart both reduced heat conduction and high infrared reflectance in a thin coating with a 65–100 μm dry film thickness (DFT). With a judicial combination of hollow microspheres (HMS) activated and modified with silica (sHMS) and stearic acid-modified TiO2 (sMO), the developed composite coating attained the highest thermal insulation property with a temperature drop of 21–31 °C at different distances below the coated panel, which is superior to the values of temperature drop reported earlier. The high solar reflectance of the composite coating in the near-infrared (NIR) region exceeds 72% with a low thermal conductivity of 0.178 W m–1 K–1. After 720 h of exposure in a 3.5 wt % NaCl solution, the composite coating revealed a corrosion protection efficiency of 99%. The work demonstrates that high solar reflectivity and low thermal conductivity must be active simultaneously to achieve superior thermal shielding in a thin coating on a metal. A careful selection of fillers and appropriate surface modifications ensures hydrophobicity and proper distribution of the fillers in the coating for a high barrier effect to prevent environmental deterioration. With these superior performance parameters, the developed composite coatings make an essential contribution to energy sustainability and the protection against environmental degradation.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Corrosion-Resistant Hydrophobic Thermal Barrier Composite Coating on Metal Strip: A New Dimension to Steel Strips for Roofing Segment

Ananthapadmanabhan,

Rout,

Chatterjee

et al. 2023

ACS Appl. Mater. Interfaces

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“…Near-infrared (NIR) spectroscopy is a potent and valued physicochemical technique of analysis [1][2][3]. This technique is primarily recognized in the applications to analytical chemistry [4] as a rapid, cost-efficient, simple, and non-destructive technique with nearly no sample preparation required, which appears to be a very attractive and useful alternative tool for qualitative and quantitative analyses in the agriculture [5,6], food [7,8], chemical [9,10], and pharmaceutical industries [11]. However, it is also met with an increasing importance in bioscience [12,13], medicine [14,15], and various applications related to hyperspectral imaging as well [16].…”

Section: Introductionmentioning

confidence: 99%

Anharmonic DFT Study of Near-Infrared Spectra of Caffeine: Vibrational Analysis of the Second Overtones and Ternary Combinations

et al. 2021

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Anharmonic quantum chemical calculations were employed to simulate and interpret a near-infrared (NIR) spectrum of caffeine. First and second overtones, as well as binary and ternary combination bands, were obtained, accurately reproducing the lineshape of the experimental spectrum in the region of 10,000–4000 cm−1 (1000–2500 nm). The calculations enabled performing a detailed analysis of NIR spectra of caffeine, including weak bands due to the second overtones and ternary combinations. A highly convoluted nature of NIR spectrum of caffeine was unveiled, with numerous overlapping bands found beneath the observed spectral lineshape. To properly reflect that intrinsic complexity, the band assignments were provided in the form of heat maps presenting the contributions to the NIR spectrum from various kinds of vibrational transitions. These contributions were also quantitatively assessed in terms of the integral intensities. It was found that the combination bands provide the decisively dominant contributions to the NIR spectrum of caffeine. The first overtones gain significant importance between 6500–5500 cm−1, while the second overtones are meaningful in the higher wavenumber regions, particularly in the 10,000–7000 cm−1 region. The obtained detailed band assignments enabled deep interpretation of the absorption regions of caffeine identified in the literature as meaningful for analytical applications of NIR spectroscopy focused on quantitative analysis of caffeine content in drugs and natural products.

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“…The latter technique requires either sample preparation (i.e., a destructive dilution of the sample in a non-absorbing medium) or the use of attenuated total reflection (ATR) mode, which introduces a set of issues, e.g., related to the quality of the surface contact between the sample and the internal reflective element (IRE) or very shallow penetration depth that may become an issue for imperfectly homogenous samples. A straightforward applicability makes NIR spectroscopy highly valued as a nondestructive, rapid, and efficient tool for qualitative and quantitative analysis in a variety of areas, for example in foodstuff 5,6 and natural products, 7 agriculture, [8][9][10] pharmaceuticals, 11 polymers, 12 and fuel, 13 among others. 1 Near-infrared spectroscopy is an essential division of vibrational spectroscopy in basic research as well.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Simulation of Near-Infrared Spectrum of Piperine: Insight into Band Origins and the Features of Regression Models

et al. 2021

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We investigated the near-infrared spectrum of piperine using quantum mechanical calculations. We evaluated two efficient approaches, DVPT2//PM6 and DVPT2//ONIOM [PM6:B3LYP/6-311++G(2df, 2pd)] that yielded a simulated spectrum with varying accuracy versus computing time factor. We performed vibrational assignments and unveiled complex nature of the near-infrared spectrum of piperine, resulting from a high level of band convolution. The most meaningful contribution to the near-infrared absorption of piperine results from binary combination bands. With the available detailed near-infrared assignment of piperine, we interpreted the properties of partial least square regression models constructed in our earlier study to describe the piperine content in black pepper samples. Two models were compared with spectral data sets obtained with a benchtop and a miniaturized spectrometer. The two spectrometers implement distinct technology which leads to a profound instrumental difference and discrepancy in the predictive performance when analyzing piperine content. We concluded that the sensitivity of the two instruments to certain types of piperine vibrations is different and that the benchtop spectrometer unveiled higher selectivity. Such difference in obtaining chemical information from a sample can be one of the reasons why the benchtop spectrometer performs better in analyzing the piperine content of black pepper. This evidenced direct correspondence between the features critical for applied near-infrared spectroscopic routine and the underlying vibrational properties of the analyzed constituent in a complex sample.

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Applications of NIR Techniques in Polymer Coatings and Synthetic Textiles

Cited by 6 publications

References 47 publications

Corrosion-Resistant Hydrophobic Thermal Barrier Composite Coating on Metal Strip: A New Dimension to Steel Strips for Roofing Segment

Corrosion-Resistant Hydrophobic Thermal Barrier Composite Coating on Metal Strip: A New Dimension to Steel Strips for Roofing Segment

Anharmonic DFT Study of Near-Infrared Spectra of Caffeine: Vibrational Analysis of the Second Overtones and Ternary Combinations

Theoretical Simulation of Near-Infrared Spectrum of Piperine: Insight into Band Origins and the Features of Regression Models

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