scholarly journals Influence of Acetylated Cellulose Nanocrystal Incorporated into Poly(e-Caprolactone) Nanocomposites on Its Thermal, Mechanical, and Physicochemical Properties

2021 ◽  
Vol 56 (3) ◽  
pp. 274-283
Author(s):  
Marpongahtun ◽  
Darwin Yunus Nasution ◽  
Nami Panindia ◽  
Vivi Purwandari
Keyword(s):  
Particle Size ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Physicochemical Properties ◽  
Fourier Transform Infrared Spectroscopy ◽  
Thermal Gravimetric Analysis ◽  
Cellulose Nanocrystals ◽  
Cellulose Nanocrystal ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric

Poly(e-caprolactone) are synthetic biodegradable polymers that can potentially be used as biocompatible materials for biological applications. The purpose of this work was to investigate the effect of acetylated cellulose nanocrystals isolated from corncob waste loaded into poly(e-caprolactone) matrix blend on its thermal, mechanical, morphology, and crystallinity. The acetylated cellulose nanocrystal filler with various concentrations (namely 5, 10, 15, and 20%) was mixed with poly(e-caprolactone) matrix prepared using reflux method under N2 gas flow at 120oC for 10 min. Subsequently, the samples was characterized by thermal gravimetric analysis, DSC, tensile, Fourier transform infrared spectroscopy, tunneling electron microscope, SEM, and XRD to determine the thermal, mechanical, functional group, particle size, morphology, and crystallinity, respectively. Thermal gravimetric analysis and DSC analysis revealed that the thermal stability of poly(e-caprolactone) improved and the degree of crystallinity gradually increased with the addition of 10% acetylated cellulose nanocrystals, hence resulting in a higher Young's modulus. Fourier transform infrared spectroscopy results demonstrate that acetylated cellulose nanocrystal was successfully incorporated into poly(e-caprolactone) with an additional OH group. In addition, the particle size of 32 nm for acetylated cellulose nanocrystal and the formation of agglomeration was present based on TEM analysis, thus suggesting that acetylated cellulose nanocrystal was compatible as a reinforcing filler in the poly(e-caprolactone) matrix. SEM and XRD analysis suggests that the morphology was relatively smooth and higher crystallinity was achieved. The results of this research demonstrated the good feasibility of poly(e-caprolactone)/acetylated cellulose nanocrystal nanocomposites with improved thermal, mechanical, and physicochemical properties that were successfully prepared using simple and low-cost acetylated cellulose nanocrystal as a filler material.

Improved Crystallinity of Zinc Sulfide Nanoparticles in Aqueous Environment

2005 ◽  
Vol 879 ◽  
Author(s):  
Navendu Goswami ◽  
P. Sen
Keyword(s):  
Particle Size ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Zinc Sulfide ◽  
Structural Transformation ◽  
Powder Diffraction ◽  
Aqueous Environment ◽  
X Ray ◽  
Zinc Sulfide Nanoparticles

AbstractZinc sulfide nanoparticles, prepared employing a non-equilibrium route, are investigated for surface related effects. Water has been shown to induce a structural transformation in nanoparticles prepared this way, which is not related to their particle size. Employing Fourier transform infrared spectroscopy and x-ray powder diffraction, we show here the importance of S-H interaction in the buildup to the final ZnS structure of these nanoparticles. These particles hold promise as water sensors.

scholarly journals Novel NiMgOH-rGO-Based Nanostructured Hybrids for Electrochemical Energy Storage Supercapacitor Applications: Effect of Reducing Agents

Crystals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1144
Author(s):  
Konda Shireesha ◽  
Thida Rakesh Kumar ◽  
Tumarada Rajani ◽  
Chidurala Shilpa Chakra ◽  
Murikinati Mamatha Kumari ◽  
...  
Keyword(s):  
Particle Size ◽  
Cyclic Voltammetry ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
X Ray Diffraction ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Particle Size Analyzer ◽  
Uv Visible

This paper describes the synthesis and characterization of NiMgOH-rGO nanocomposites made using a chemical co-precipitation technique with various reducing agents (e.g., NaOH and NH4OH) and reduced graphene oxide at 0.5, 1, and 1.5 percent by weight. UV-visible spectroscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, a particle size analyzer, and cyclic voltammetry were used to characterize the composite materials. The formation of the NiMgOH-rGO nanocomposite with crystallite sizes in the range of 10–40 nm was inferred by X-ray diffraction patterns of materials, which suggested interlayers of Ni(OH)2 and Mg(OH)2. The interactions between the molecules were detected using Fourier-transform infrared spectroscopy, while optical properties were studied using UV-visible spectroscopy. A uniform average particle size distribution in the range of 1–100 nm was confirmed by the particle size analyzer. Using cyclic voltammetry and galvanostatic charge/discharge measurements in a 6 M KOH solution, the electrochemical execution of NiMgOH-rGO nanocomposites was investigated. At a 1 A/g current density, the NiMgOH-rGO nanocomposites prepared with NH4OH as a reducing agent had a higher specific capacitance of 1977 F/g. The electrochemical studies confirmed that combining rGO with NiMgOH increased conductivity.

scholarly journals Comparative Study of Physicochemical Properties and Antibiofilm Activity of Graphene Oxide Nanoribbons

2020 ◽  
Vol 7 (1) ◽  
pp. C1-C8 ◽  
Author(s):  
T. Javanbakht ◽  
H. Hadian ◽  
K. J. Wilkinson
Keyword(s):  
Fourier Transform ◽  
Graphene Oxide ◽  
Infrared Spectroscopy ◽  
Confocal Microscopy ◽  
Physicochemical Properties ◽  
Fourier Transform Infrared Spectroscopy ◽  
Fourier Transform Infrared ◽  
Bacterial Biofilm ◽  
Antibiofilm Activity ◽  
Graphene Oxide Nanoribbons

In this article, the antibiofilm activity and physicochemical properties of graphene oxide (GO) nanoribbons, which have been among the most exciting materials, were studied by measuring the ratio of killed to alive bacteria incubated with these nanomaterials. Our objective was to determine the related physicochemical and antibiofilm properties of graphene oxide nanoribbons. We hypothesized that the physicochemical properties of graphene oxide nanoribbons could affect their antibiofilm activity. A combination of spectroscopic and microscopic measurements of the samples allowed us to determine their physicochemical properties affecting the biofilms. Our work includes information on the surface properties of these materials related to their incubation with the biofilms. The Fourier transform infrared spectroscopy showed the vibrations of OH groups of water molecules adsorbed on graphene oxide nanoribbons. The results show the high antibiofilm activity of the graphene oxide nanoribbons. The fluorescence confocal microscopy revealed that 50 % ± 3 % of the total number of bacteria were killed with these nanomaterials. The incubation of graphene oxide nanoribbons with bacterial biofilms resulted in the appearance of the NO2–, NO3– peaks in the negative mode mass spectrum. The attenuation of the O– and OH– peaks were attributed to the interactions of the samples with the biofilms. Our study gives more evidence of the practical value of graphene oxide nanoribbons in killing bacteria related to their surface physical properties and the potential of these nanomaterials for materials science and biomedical applications. Keywords: nanomaterials, bacterial biofilm, Fourier transform, infrared spectroscopy, transmission electron microscopy, time-of-flight secondary ion mass spectrometry, confocal microscopy.

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