Qualitatively and quantitatively characterizing water adsorption of a cellulose nanofiber film using micro-FTIR spectroscopy

Guo, Xin; Liu, Liu; Wu, Junjie; Fan, Junwei; Wu, Yiqiang

doi:10.1039/c7ra09894d

Cited by 44 publications

(27 citation statements)

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“…6). A broad band region of 3700-3000 cm −1 was assigned to hydrogen bonded (O-H) stretching and other region 3000-2800 cm − assign to asymmetric, symmetric methyl and methylene CH cellulose group [17,41]. All samples developed broad peak at 3424 cm −1 are ascribed to O-H stretching assign for water (Fig.…”

Section: Crystallinity Indexmentioning

confidence: 90%

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Extraction and characterization of cellulose from halophytes: next generation source of cellulose fibre

2019

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Cellulose content was estimated from Tamarix aphylla, Juncus rigidus, and Thespesia populnea growing in saline soil at salt farm experimental plot of Central Salt and Marine Chemicals Research Institute (CSMCRI), Bhavnagar, Gujarat, India. Cellulose was extracted from the plant samples by the treatment of NaClO 2 followed by NaOH, HCl, and H 2 O 2. Extracted cellulose samples were fractionated to α-cellulose and β-cellulose. Tamarix aphylla was subject to different treatments, and among all the treatments the highest cellulose fibre was extracted from T1 (3.0% NaClO 2 followed by 17.5% NaOH, 4.0% HCl) with 33% α-cellulose having 61% crystallinity. Maximum (44.0%) crude cellulose (3.5% NaClO 2 followed by 2.0% NaOH, 5.0% HCl, 17.5% NaOH) was obtained from J2 treatment (J. rigidus) with 58.7% crystallinity, 33% α-cellulose with 62% crystallinity and TP3 (4.0% NaClO 2 followed by 4.0% NaOH, 5.5% HCl, 17.5% NaOH) was best for T. populnea with 39% highest crude cellulose with 64.4% crystallinity, 30% α-cellulose with 55% crystallinity. The cellulose related peaks were noted in XRD and FTIR spectra; lignin and hemicellulose related peaks were absent. This confirms the removal of lignin and hemicellulose from the isolated product. All the three halophytes growing in saline soil were found good source of cellulose. However, T. aphylla contain highest cellulose and α-cellulose with highest crystallinity as compared to J. rigidus, and T. populnea.

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Section: Crystallinity Indexmentioning

confidence: 90%

“…7). The broad band region 2908 cm −1 is of C-H stretching vibration assign to cellulose component [17,20]. The band at 1636 cm −1 is associated with absorbed water in cellulose (Fig.…”

Section: Crystallinity Indexmentioning

confidence: 99%

Extraction and characterization of cellulose from halophytes: next generation source of cellulose fibre

2019

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“…The FTIR spectra of two crystalline materials were shown in Figure . A large broadband occurred at about 3712–2610 cm −1 , which assigned to the stretching vibration of OH group of water molecules for GCuN1 and this kind of broadband not appeared in GCuN2, which indicates the absence of water molecule . The bond N−H bending and carboxylic asymmetric stretching occurs for GCuN1 in 3316 cm −1 and 1595 cm −1 respectively, which are blue shifted and N−H group bending splitted into two bands (3325, 3258 cm −1 ) due to the structural changes change, chain into lonsdaleite via the amino and carboxylato interactions.…”

Section: Resultsmentioning

confidence: 94%

1D Helical Single‐Crystal to 3D Lonsdaleite Single‐Crystal Transformation of Copper(II)‐Based Coordination Polymer: Acetone Fluorescence Sensing and CO₂ Gas Separation

Sasikala

Sundar

Lakshmi³

2019

ChemistrySelect

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The temperature-driven 1D helical single-crystal (1) to 3D lonsdaleite (2) single-crystal transformation of copper-based coordination polymer has been investigated. Powder X-ray diffraction experiments showed that the phase transitions described for single crystals also occur in the powder samples. The thermal stability of the compounds were studied by Differential Scanning Calorimetric (DSC) and thermal gravimetric (TG) analyses indicates, there is no coordination water molecules were present in the 2 also thermal stability increased. In UV-Vis absorption spectra, compound 2 has blue shift compared to 1 due to partial decrease in the number of electrons surrounding Cu 2 + ion and the geometry around Cu 2 + center after loss of H 2 O. Interestingly both compounds showed the tremendous luminescent enhancement for acetone in the visible region and detection limit of 2 was 4.04x10 À 9 M is much better than its threshold limit recommended by WHO. Porous natures of the compounds were analyzed by theoretical and experimentally. BET sorption analyze indicated both crystal phases selectively adsorb CO 2 over N 2. Therefore, this compounds, promising material for acetone sensor, selective sorption, separation of CO 2 from industrial flue gas or the removal of CO 2 from natural gas.[a] V.

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“…Considering that micro-FTIR spectroscopy has the ability to study micron-sized sample [37,38], in this study, we developed a method for rapid detection of MC of nanogram-scaled heat-treated wood. First, we collected micro-FTIR spectra of nanogram-scaled heattreated wood during moisture adsorption process.…”

Section: Introductionmentioning

confidence: 99%

Micro-FTIR spectroscopy and partial least-squares regression for rapid determination of moisture content of nanogram-scaled heat-treated wood

et al. 2020

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Moisture sorption has a significant impact on the performance of heat-treated wood. In order to better characterize moisture sorption of heat-treated wood, a method for rapid determination of moisture content (MC) of nanogramscaled heat-treated wood is proposed in this work. During moisture adsorption process, micro-Fourier transform infrared (FTIR) spectra of heat-treated wood were recorded. Spectral analysis was applied to these measured spectra, and then moisture adsorption sites and spectral ranges affected by moisture sorption were identified. Meanwhile, moisture contents (MCs) of heat-treated wood at various relative humidity (RH) levels were measured by using dynamic vapor sorption (DVS) setup. Based on these spectral ranges and MCs, a quantitative forecasting model was established using partial least-square regression (PLSR). Furthermore, the developed forecasting model was applied to acquire moisture sorption isotherm of heat-treated wood, in which a very positive correlation between predicted and measured MCs was observed. It was confirmed that this method was effective for rapid detection of MC of nanogram-scaled heat-treated wood which had unique advantages of rapid analysis (second level) and less sample consumption (nanogram level).

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Qualitatively and quantitatively characterizing water adsorption of a cellulose nanofiber film using micro-FTIR spectroscopy

Abstract: The efficient utilization of cellulose is very important for environmental protection and sustainability of resources.

Cited by 44 publications

References 46 publications

Extraction and characterization of cellulose from halophytes: next generation source of cellulose fibre

Extraction and characterization of cellulose from halophytes: next generation source of cellulose fibre

1D Helical Single‐Crystal to 3D Lonsdaleite Single‐Crystal Transformation of Copper(II)‐Based Coordination Polymer: Acetone Fluorescence Sensing and CO₂ Gas Separation

Micro-FTIR spectroscopy and partial least-squares regression for rapid determination of moisture content of nanogram-scaled heat-treated wood

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Qualitatively and quantitatively characterizing water adsorption of a cellulose nanofiber film using micro-FTIR spectroscopy

Abstract: The efficient utilization of cellulose is very important for environmental protection and sustainability of resources.

Cited by 44 publications

References 46 publications

Extraction and characterization of cellulose from halophytes: next generation source of cellulose fibre

Extraction and characterization of cellulose from halophytes: next generation source of cellulose fibre

1D Helical Single‐Crystal to 3D Lonsdaleite Single‐Crystal Transformation of Copper(II)‐Based Coordination Polymer: Acetone Fluorescence Sensing and CO2 Gas Separation

Micro-FTIR spectroscopy and partial least-squares regression for rapid determination of moisture content of nanogram-scaled heat-treated wood

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1D Helical Single‐Crystal to 3D Lonsdaleite Single‐Crystal Transformation of Copper(II)‐Based Coordination Polymer: Acetone Fluorescence Sensing and CO₂ Gas Separation