Characterization of Various Kinds of Nanocellulose

Ioelovich, Michael

doi:10.1002/9783527689972.ch2

Cited by 41 publications

(31 citation statements)

References 99 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The crystallinity index (CI) was calculated by using equation 1for those planes and it was 74.38%, as predicted according to acid concentration during hydrolysis period. The CI value obtained is comparable to nano-cellulose reported in many literatures [28,29,32]. The small deviations showed is due to the aberrant hydrolysis process.…”

Section: X-ray Diffractionsupporting

confidence: 84%

Study of Cellulose Nanocrystals (CNC) & Polyvinyl Alcohol (PVA) Composite Film Modified Using Silica and Polybutylene Terephthalate(PBT) As a Transparent, Hydrophobic, Self-Cleaning Cover

Khadka¹,

Parajuli²,

Acharya³

et al. 2020

Preprint

View full text Add to dashboard Cite

Solar panel soiling is a major barrier in electricity generation by solar Photo-Voltaic (PV) technology, especially in dust-prone cities like Kathmandu. Currently employed techniques use expensive cleaning bots, short-lived coatings or environmentally non-friendly coatings. This paper encompasses a study of a green alternative to counteract solar panel soiling. Cellulose nanocrystals (CNC) blended with Poly Vinyl Alcohol (PVA) with surface modification by Poly butylene terephthalate (PBT) and powdered silica was used to produce a transparent, hydrophobic film which could act as a self-cleaning cover for soiling prone solar panels. The film exhibited an average transmittance of 92.18% of the incident light in the solar PV working spectra (420nm-700nm). Hydrophobicity was quantified by the water contact angle (WCA) which was an average of 87.25°. The film was durable to photocatalytic and hydrolytic decay but further research is warranted before rendering the film suitable for use as a protective cover for solar panels.

show abstract

Section: X-ray Diffractionsupporting

confidence: 84%

Study of Cellulose Nanocrystals (CNC) & Polyvinyl Alcohol (PVA) Composite Film Modified Using Silica and Polybutylene Terephthalate(PBT) As a Transparent, Hydrophobic, Self-Cleaning Cover

Khadka¹,

Parajuli²,

Acharya³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…From the value of the zeta potential, it can be concluded that the suspension of CNFs is stable because the absolute value was higher than –25 mV [34]. This value signifies that there was enough mutual repulsion resulting in colloidal stability which could be an essential requirement for improving the mechanical properties of the nanocellulose based composites [35].…”

Section: Resultsmentioning

confidence: 99%

Extraction of Cellulose Nanofibers via Eco-friendly Supercritical Carbon Dioxide Treatment Followed by Mild Acid Hydrolysis and the Fabrication of Cellulose Nanopapers

et al. 2019

View full text Add to dashboard Cite

The conventional isolation of cellulose nanofibers (CNFs) process involves high energy input which leads to compromising the pulp fiber’s physical and chemical properties, in addition to the issue of elemental chlorine-based bleaching, which is associated with serious environmental issues. This study investigates the characteristic functional properties of CNFs extracted via total chlorine-free (TCF) bleached kenaf fiber followed by an eco-friendly supercritical carbon dioxide (SC-CO2) treatment process. The Fourier transmission infra-red FTIR spectra result gave remarkable effective delignification of the kenaf fiber as the treatment progressed. TEM images showed that the extracted CNFs have a diameter in the range of 10–15 nm and length of up to several micrometers, and thereby proved that the supercritical carbon dioxide pretreatment followed by mild acid hydrolysis is an efficient technique to extract CNFs from the plant biomass. XRD analysis revealed that crystallinity of the fiber was enhanced after each treatment and the obtained crystallinity index of the raw fiber, alkali treated fiber, bleached fiber, and cellulose nanofiber were 33.2%, 54.6%, 88.4%, and 92.8% respectively. SEM images showed that amorphous portions like hemicellulose and lignin were removed completely after the alkali and bleaching treatment, respectively. Moreover, we fabricated a series of cellulose nanopapers using the extracted CNFs suspension via a simple vacuum filtration technique. The fabricated cellulose nanopaper exhibited a good tensile strength of 75.7 MPa at 2.45% strain.

show abstract

“…CNC crystallite sizes were estimated using the Scherrer equation [35]: L = Kλ / ß 1/2 Cosθ , where, L is the crystal dimension perpendicular to the diffracting planes with hkl Miller indices, λ is the wavelength of X-ray radiation, ß 1/2 is the full width of the diffraction peak measured at half maximum height (FWHM), θ is the diffraction angle, and K = 0.94.…”

Section: Methodsmentioning

confidence: 99%

Preparation and Characterization of Polyvinylpyrrolidone/Cellulose Nanocrystals Composites

et al. 2018

View full text Add to dashboard Cite

Composite films and aerogels of polyvinylpyrrolidone/cellulose nanocrystals (PVP/CNC) were prepared by solution casting and freeze-drying, respectively. Investigations into the PVP/CNC composite films and aerogels over a wide composition range were conducted. Thermal stability, morphology, and the resulting reinforcing effect on the PVP matrix were explored. FTIR, TGA, DSC, X-ray diffraction, SEM, and tensile testing were used to examine the properties of the composites. It was revealed PVP-assisted CNC self-assembly that produces uniform CNC aggregates with a high aspect ratio (length/width). A possible model of the PVP-assisted CNC self-assembly has been considered. Dispersibility of the composite aerogels in water and some organic solvents was studied. It was shown that dispersing the composite aerogels in water resulted in stable colloidal suspensions. CNC particles size in the redispersed aqueous suspensions was near similar to the CNC particles size in never-dried CNC aqueous suspensions.

show abstract

Characterization of Various Kinds of Nanocellulose

Cited by 41 publications

References 99 publications

Study of Cellulose Nanocrystals (CNC) & Polyvinyl Alcohol (PVA) Composite Film Modified Using Silica and Polybutylene Terephthalate(PBT) As a Transparent, Hydrophobic, Self-Cleaning Cover

Study of Cellulose Nanocrystals (CNC) & Polyvinyl Alcohol (PVA) Composite Film Modified Using Silica and Polybutylene Terephthalate(PBT) As a Transparent, Hydrophobic, Self-Cleaning Cover

Extraction of Cellulose Nanofibers via Eco-friendly Supercritical Carbon Dioxide Treatment Followed by Mild Acid Hydrolysis and the Fabrication of Cellulose Nanopapers

Preparation and Characterization of Polyvinylpyrrolidone/Cellulose Nanocrystals Composites

Contact Info

Product

Resources

About

Characterization of Various Kinds of Nanocellulose

Cited by 41 publications

References 99 publications

Study of Cellulose Nanocrystals (CNC) &amp; Polyvinyl Alcohol (PVA) Composite Film Modified Using Silica and Polybutylene Terephthalate(PBT) As a Transparent, Hydrophobic, Self-Cleaning Cover

Study of Cellulose Nanocrystals (CNC) &amp; Polyvinyl Alcohol (PVA) Composite Film Modified Using Silica and Polybutylene Terephthalate(PBT) As a Transparent, Hydrophobic, Self-Cleaning Cover

Extraction of Cellulose Nanofibers via Eco-friendly Supercritical Carbon Dioxide Treatment Followed by Mild Acid Hydrolysis and the Fabrication of Cellulose Nanopapers

Preparation and Characterization of Polyvinylpyrrolidone/Cellulose Nanocrystals Composites

Contact Info

Product

Resources

About

Study of Cellulose Nanocrystals (CNC) & Polyvinyl Alcohol (PVA) Composite Film Modified Using Silica and Polybutylene Terephthalate(PBT) As a Transparent, Hydrophobic, Self-Cleaning Cover

Study of Cellulose Nanocrystals (CNC) & Polyvinyl Alcohol (PVA) Composite Film Modified Using Silica and Polybutylene Terephthalate(PBT) As a Transparent, Hydrophobic, Self-Cleaning Cover