scholarly journals Functional Properties and Molecular Degradation of Schizostachyum Brachycladum Bamboo Cellulose Nanofibre in PLA-Chitosan Bionanocomposites

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 2008
Author(s):  
Samsul Rizal ◽  
N. I. Saharudin ◽  
N. G. Olaiya ◽  
H. P. S. Abdul Khalil ◽  
M. K. Mohamad Haafiz ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Moisture Content ◽  
Polymeric Materials ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Thickness Swelling ◽  
Compression Moulding ◽  
Ft Ir ◽  
Degradation Properties

The degradation and mechanical properties of potential polymeric materials used for green manufacturing are significant determinants. In this study, cellulose nanofibre was prepared from Schizostachyum brachycladum bamboo and used as reinforcement in the PLA/chitosan matrix using melt extrusion and compression moulding method. The cellulose nanofibre(CNF) was isolated using supercritical carbon dioxide and high-pressure homogenisation. The isolated CNF was characterised with transmission electron microscopy (TEM), FT-IR, zeta potential and particle size analysis. The mechanical, physical, and degradation properties of the resulting biocomposite were studied with moisture content, density, thickness swelling, tensile, flexural, scanning electron microscopy, thermogravimetry, and biodegradability analysis. The TEM, FT-IR, and particle size results showed successful isolation of cellulose nanofibre using this method. The result showed that the physical, mechanical, and degradation properties of PLA/chitosan/CNF biocomposite were significantly enhanced with cellulose nanofibre. The density, thickness swelling, and moisture content increased with the addition of CNF. Also, tensile strength and modulus; flexural strength and modulus increased; while the elongation reduced. The carbon residue from the thermal degradation and the glass transition temperature of the PLA/chitosan/CNF biocomposite was observed to increase with the addition of CNF. The result showed that the biocomposite has potential for green and sustainable industrial application.

The Evaporative Decomposition of Solutions Method (Eds) for the Production of Ultrafine Y1Ba2Cu3O7 from Nitrate and Mixed Anion Precursor Solutions

1989 ◽  
Vol 169 ◽  
Author(s):  
Rollin E. Lakis ◽  
Sidney R. Butler
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Barium Carbonate ◽  
Hollow Spheres ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron

AbstractY1Ba2Cu3O7 has been prepared by the evaporative decomposition of solutions method. Nitrate and mixed anion solutions were atomized and decomposed at temperatures ranging from 300°C to 950°C. The resulting materials have been characterized using x-ray powder diffraction, Thermal Gravimetric Analysis (TGA), particle size analysis, Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM). The powder consists of 0.3 micron agglomerated hollow spheres with a primary particle size of 0.06 micron. TGA and x-ray diffraction indicate the presence of barium nitrate and barium carbonate due to incomplete decomposition and/or product contamination by the process environment.

scholarly journals PREPARATION AND CHARACTERIZATION OF ANTI-ACNE ETHOSOMES USING COLD AND THIN-LAYER HYDRATION METHODS

2018 ◽  
Vol 10 (1) ◽  
pp. 338
Author(s):  
Rachmawati Ramadhana Mustofa ◽  
Iskandarsyah .
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Thin Layer ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Multilamellar Vesicles ◽  
Zeta Potentials ◽  
Small Unilamellar Vesicles

Objective: This study aimed to prepare and characterize anti-acne ethosomes using the cold- and thin-layer hydration methods.Methods: A sonication step was included during ethosome preparation to improve the quality of the cold method. Azelaic acid, Phospholipon 90G,ethanol, propylene glycol, and phosphate buffer (pH 7.4) were used in the procedures. Prepared ethosomal suspensions were characterized usingtransmission electron microscopy, particle-size analysis, and spectrophotometry.Results: Ethosomes prepared using the thin-layer hydration method (F1) had small unilamellar vesicles, while those prepared using the cold methodwith 15-min sonication (F4) showed spherical, elliptical, unilamellar, and multilamellar vesicles. F1 ethosomes had a Dmean volume of 648.57±231.26,whereas those prepared using the cold method with 5- (F2), 10- (F3), and 15-min (F4) sonication had Dmean volumes of 2734.04±231.49 nm,948.90±394.52 nm, and 931.69±471.84 nm, respectively. Polydispersity indices of F2, F3, and F4 ethosomes were 0.74±0.21, 0.86±0.05, and 0.91±0.03,respectively, with a poor particle-size distribution, compared to that of F1 (0.39±0.01). Zeta potentials of F1–F4 ethosomes were −38.27±1.72 mV,−23.53±1.04 mV, −31.4±1.04 mV, and −34.3±1.61 mV, respectively. Entrapment efficiencies of F1–F4 ethosomes were 90.71±0.11%, 53.84±3.16%,72.56±0.28%, and 75.11±1.42%, respectively.Conclusion: Anti-acne ethosomes produced using the thin-layer hydration method had superior properties than those produced using the coldmethod with 15-min sonication.

Particle Size Analysis for Fuel Cell Catalysts Using Electron Microscopy: Bright Field or HAADF Images?

2012 ◽  
Vol 18 (S2) ◽  
pp. 1364-1365 ◽  
Author(s):  
Y. Zhao ◽  
Y. Tang ◽  
G. Vaughan ◽  
D. Ozkaya
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Fuel Cell ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Bright Field ◽  
Fuel Cell Catalysts

Extended abstract of a paper presented at Microscopy and Microanalysis 2012 in Phoenix, Arizona, USA, July 29 – August 2, 2012.

Inhalation of nail dust from onychomycotic toenails. Part I. Characterization of particles. 1984

1992 ◽  
Vol 82 (2) ◽  
pp. 111-115 ◽  
Author(s):  
C Abramson ◽  
J Wilton
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Particle Size ◽  
Total Mass ◽  
Particle Size Analysis ◽  
Dust Particles ◽  
Size Analysis ◽  
Scanning Electron

Nail dust particles were analyzed by scanning electron microscopy for size and topography. The percentage of "fines" that could be inhaled and deposited in the alveoli and bronchioles were determined by quantitative particle size analysis. Distribution representing the largest total mass was graphed between 1 and 2 microns. The authors found that 86% of nail dust would reach the bronchioles and alveoli, and 31% could be expected to deposit in these areas.

scholarly journals The Performance and Adsorption Mechanism of a Novel Collector, Dodecyl Dimethyl Betaine (BS-12), for the Flotation Separation of Ilmenite and Titanaugite

Minerals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 116 ◽  
Author(s):  
Pan Chen ◽  
Xujian Chai ◽  
Mengjie Tian ◽  
Wei Chen ◽  
Si Wan ◽  
...  
Keyword(s):  
Particle Size ◽  
Photoelectron Spectroscopy ◽  
Active Sites ◽  
Adsorption Mechanism ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Xps Analysis ◽  
Spectroscopy Analysis ◽  
Ft Ir ◽  
Ph Range

In this paper, a novel collector, dodecyl dimethyl betaine (BS-12), was used in the selective separation of ilmenite from titanaugite. The flotation performance and associated adsorption mechanism were studied by micro-flotation experiments, particle size analysis, Fourier-transform infrared (FT-IR) spectroscopy analysis, and X-ray photoelectron spectroscopy (XPS) analysis. The micro-flotation results indicated that BS-12 exhibited a stronger collecting ability towards ilmenite than titanaugite within an acidic pH range, and that the recovery of ilmenite was about 50% higher than that of titanaugite under the optimum flotation conditions. Particle size analysis demonstrated that BS-12 could selectively agglomerate ilmenite to a certain extent and then contribute to the flotation difference between ilmenite and titanaugite. FT-IR results showed some characteristic bands of BS-12 on treated ilmenite, and on titanaugite with BS-12. The XPS analysis further confirmed that BS-12 chemisorbed onto ilmenite and titanaugite in a similar way, but the limited active sites on titanaugite in comparison with ilmenite accounted for their differences in flotation.

scholarly journals KARAKTERISASI FISIKOKIMIA DAN AKTIVITAS ANTIOKSIDAN SERAT PANGAN DARI AMPAS EMPULUR SAGU BARUK (Arenga Microcarpha B.)

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Nova . ◽  
Edi Suryanto ◽  
Lidya I. Momuat
Keyword(s):  
Antioxidant Activity ◽  
Particle Size ◽  
Fourier Transform ◽  
Dietary Fiber ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
X Ray ◽  
Insoluble Dietary Fiber ◽  
Infra Red ◽  
Ft Ir

Telah dilakukan pengujian potensi aktivitas antioksidan serat pangan dari ampas empulur sagu baruk. Penelitian ini bertujuan untuk mengetahui potensi antioksidan dari ampas empulur sagu baruk. Hasil penelitian menunjukkan bahwa ampas empulur sagu baruk tidak mengalami perubahan mendasar pada komponen utama selama penggilingan ditunjukkan pada hasil spektra Fourier Transform Infra Red (FT-IR). Hasil analisis Particle Size Analysis (PSA) menunjukkan ukuran partikel dari ampas empulur sagu baruk sebesar 92,89 µm. Analisis X-ray Difraction (XRD) menunjukkan adanya karakteristik dari selulosa yang merupakan bagian dari serat pangan tak larut. Hasil pengujian serat pangan didapatkan bahwa ampas empulur sagu baruk memiliki serat pangan total sebesar 68,71% yang meliputi 66,58% serat pangan tak larut dan 2,12% serat pangan larut. Kadar serat pangan tak larut meliputi kadar selulosa, hemiselulosa dan lignin yaitu 50,7%; 29,16%; dan 11,67% secara berturut-turut. Hasil pengujian aktivitas antioksidan metode DPPH dari ekstrak fenolik terikat (EFT) dan fenolik bebas (EFB) ampas empulur sagu baruk menunjukkan aktivitas antioksidan sebesar 66,20% EFB dan 50,97% EFT. Adapun kemampuan penangkal ion nitrit dari sampel ampas sagu baruk kering angin memiliki potensi menangkal ion nitrit sebesar 55,20% EFB dan 50,15% EFT.ABSTRACT Potential antioxidant activity of food fiber from barley sago pith pulp has been tested. This research studies the antioxidant potential of barley sago pith pulp. Fourier Transform Infra Red (FT-IR). The results showed the fact that the barley sago pith pulp did not change the basis of the main components during grinding evaluating the spectral results. The results of the analysis of Particle Size Analysis (PSA) showed that the particle size of the pith sago waste was 92.89 μm. X-ray Difraction (XRD) analysis shows the characteristics of cellulose which is part of insoluble dietary fiber. Food fiber test results were obtained from barley sago pith pulp having a total food fiber of 68.71% which contained 66.58% insoluble food fiber and 2.12% soluble food fiber. Insoluble dietary fiber content includes cellulose, hemicellulose and lignin levels that is 50.7%; 29.16%; and 11.67% consistently. The results of testing the antioxidant activity of DPPH method from phenolic extracts (EFT) and free phenolic (EFB) barley pith pulp showed antioxidant activity of 66.20% EFB and 50.97% EFT. Whereas the ability to prevent nitrite ions from dried barago sago pulp samples has the ability to counteract nitrite ions by 55.20% EFB and 50.15% EFT.

Preparation of ZnO Nanosol Dispersed in Aqueous Medium and its Dispersion Characteristics

2013 ◽  
Vol 481 ◽  
pp. 66-71 ◽  
Author(s):  
Hyeon Ha Lim ◽  
Seung Ho Lee ◽  
Hyung Mi Lim ◽  
Dae Sung Kim
Keyword(s):  
Particle Size ◽  
Zeta Potential ◽  
Aqueous Medium ◽  
Average Particle Size ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Average Particle ◽  
Dispersion Parameters ◽  
Ft Ir ◽  
Zno Powder

Highly dispersed ZnO nanosol, having an average particle size of about 40nm based on Particle Size Analysis (PSA), was prepared under aqueous solution without the removal of large particles by centrifugation. The ZnO nanosol was investigated on the effect of various dispersion parameters, i.e. milling time, dispersant content, pH, etc. The nanosol was effectively dispersed at 20~30 wt% of dispersant amount compared to ZnO content under ball-milling for 10 hours at pH 10. The dispersion characteristic of the nanosol was investigated into particle size and zeta potential. We discussed on the dispersion behavior of (-) charged ZnO particle surrounded by dispersant together with the variation of (-) charged dispersant's amount in aqueous medium at pH 10. The ZnO powder and nanosol were characterized by SEM, TEM, TGA, FT-IR, PSA and Zeta-potential.

Preparation and Application of a Carboxymethylcellulose-Based Citric Acid-Crosslinked Coated Fertilizer System

2020 ◽  
Vol 1009 ◽  
pp. 54-59
Author(s):  
Vince St. Mesias ◽  
Anne Bernadette Agu ◽  
Precious Japheth Benablo ◽  
David Penaloza Jr.
Keyword(s):  
Particle Size ◽  
Citric Acid ◽  
Controlled Release ◽  
Colloidal Stability ◽  
Crosslinking Agent ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Potential Measurement ◽  
Ft Ir ◽  
Fertilizer System

A carboxymethylcellulose-based encapsulant system for the controlled release of nitrogen-phosphorus-potassium (NPK) fertilizer was synthesized using alginate as a stabilizer, and citric acid as a crosslinking agent. Fourier-transform infrared (FT-IR) spectroscopy, particle size analysis, zeta potential measurement, and scanning electron microscopy showed successful crosslinking, sufficient particle size and colloidal stability, as well as the topography of the formed particles. Fluorescence spectroscopy confirmed successful encapsulation of a model system, 8-anilino-1-napthalenesulfonic acid. Release behavior studies under various pH conditions showed that CMC/Alg NPK conformed to the standards of controlled release fertilizer with a maximum release rate of 50% over the span of 30 days.

Sign in / Sign up

Export Citation Format

Share Document