scholarly journals Production and Characterization of Amorphous Silica Nanoparticles from Coconut Shell and Coir

2021 ◽  
Vol 11 (4) ◽  
pp. 4040-4049
Keyword(s):  
Energy Source ◽  
Size Range ◽  
Economic Importance ◽  
Coconut Shell ◽  
Muffle Furnace ◽  
Metallic Oxides ◽  
Ft Ir ◽  
High Level ◽  
Nano Size

Silica has been produced from coconut coir and coconut shell because of the economic importance of coconut in India. The wastes are generated and disposed of indiscriminately while several are utilized for the energy source. The ash produced by burning them is usually discarded with a considerable amount of extractable silica present. Therefore, extraction of this silica was done using an environmentally friendly chemical approach to produce silica that could be used in several applications. The wastes were calcined at 700oC in a muffle furnace to get ash, treated with HCl to remove soluble metallic oxides, and after that sol-gelled to obtain silica gel. The gel was then dried at 65 oC for 24 hours and characterized using SEM, EDX, FT-IR, and XRD. Silica produced is amorphous with good absorbance potentials. The SEM micrographs show the particles in the Nano size range but with a high level of agglomeration.

Fractional Extraction and Structural Characterization of Coconut Shell Hemicellulose

2014 ◽  
Vol 716-717 ◽  
pp. 108-113 ◽  
Author(s):  
Feng Hui Zhao ◽  
Yong Chen ◽  
Run Liu Chen ◽  
Min Liu ◽  
Yu Qiang Guo ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Potassium Hydroxide ◽  
Ph Value ◽  
Potassium Hydroxide Solution ◽  
Gel Permeation Chromatography ◽  
Coconut Shell ◽  
Optimal Conditions ◽  
Alkaline Peroxide ◽  
Ft Ir

Three principal components (cellulose, lignin, and hemicellulose) of coconut shell (CS), an abundant tropical biomass, were quantified using the Van Soest method. It was observed that CS had a high content of hemicellulose (30% of the raw CS material). The present study was undertaken to investigate the extractability of hemicellulose from CS obtained by ultrasound-assisted potassium hydroxide solution with the hydrogen peroxide method. The ultrasonic treatment and sequential extractions with alkali and alkaline peroxide under optimal conditions led to a release of more than 93% of the original hemicellulose. The effects of experimental variables, including pH value, reaction temperature and time, hydrogen peroxide content, and magnesium sulfate dosage on hemicellulose content were investigated. The obtained hemicelluloses were characterized by Fourier transform infrared spectroscopy (FT-IR), gel permeation chromatography (GPC), and comprehensive thermal analysis (TGA), which showed that potassium hydroxide significantly affected the yield of relatively pure hemicellulose.

scholarly journals Novel Synthesis of N-Acetylcysteine Medicine Using an Effective Method

Molbank ◽  
10.3390/m1288 ◽  
2021 ◽  
Vol 2021 (4) ◽  
pp. M1288
Author(s):  
Farzaneh Ziaee ◽  
Mohammad Ziaee
Keyword(s):  
High Performance ◽  
Proton Nuclear Magnetic Resonance ◽  
High Yield ◽  
Multi Stage ◽  
Ft Ir ◽  
Stage Process ◽  
Antioxidant Supplement ◽  
High Level ◽  
Single Batch

N-acetylcysteine (NAC) is mainly administrated as a mucolytic medication, antioxidant supplement, antidote in paracetamol overdose, and a drug for the prevention of diabetic kidney disease. Its effect has been investigated for the treatment of several diseases such as COVID-19. In this work, an effective method for high-yield synthesis of N-acetylcysteine is proposed. This drug can be synthesized in a single-batch step instead of using a multi-stage process. The proposed method has shown the potential to be considered as an alternative method for producing NAC. The purification process was carried out using suitable solvents to reach a high level of purity. The characterization of the synthesized drug was undertaken through Elemental analysis, Proton Nuclear Magnetic Resonance (1H NMR), High Performance Liquid Chromatography (HPLC), Fourier Transform Infrared Spectroscopy (FT-IR), and melting point analyses.

scholarly journals Synthesis and Characterization of New Dental Composite for Dentistry Based on Unsaturated Monomers and Nano-fillers by Photopolymerization

2020 ◽  
Vol 13 (1) ◽  
pp. 21-29
Author(s):  
Mahdi Saleh Mahdi ◽  
Mohammed Ali Mutar
Keyword(s):  
Dental Composite ◽  
Nano Composites ◽  
Nano Composite ◽  
Initiation System ◽  
Ft Ir ◽  
Tga And Dsc ◽  
Nano Size ◽  
As Solubility ◽  
Thermal Stability Of

In this study, dental nano-composite specimens were prepared by dispersion of various amounts of nano-sized fillers (HA, ZrO2, and SiO2) in a monomer system containing 60% Bis-GMA and 40% TEGDMA. 2,2 propyl bis-phenyl glycidyldimethacrylate (Bis-GMA) with unsaturated monomers were prepared. Camphor Quinone (CQ) of 1 wt %, 2-DiMethyl Amino Ethyl Methacrylate (DMAEMA) of 1 wt % have been applied in photo-initiation system for the purpose of initiating matrix resins’ co-polymerization. Wear resistance, flexural strength, hardness and compressive strength were measured. The results indicated an increase in the mechanical properties in the samples containing nano-size filler particles. It is interesting to note that, this improvement was observed at much lower nano-size filler content. Physicochemical properties, such as Solubility (SL), Water Sorption (WS) as well as the Volumetric Shrinkage (VS) have been examined. FT-IR as well as SEM have been utilized for implementing the characterization. SEM has been applied for showing particle size distribution as well as the particle agglomeration that is related to the treated nano-fillers in nano-composites. FT-IT is initially applied for identifying qualitative compositions regarding the nano-composites’ compositions. The Thermal stability of all dental nano-ocomposites was also studied using TGA and DSC techniques.

Spectral Investigation on the Growth and Characterization of NLO Crystals of Thiourea Succinic Acid Single Crystal.

2015 ◽  
Vol 2 (2) ◽  
pp. 70-73
Author(s):  
Kannan.P ◽  
Thambidurai.S ◽  
Suresh.N
Keyword(s):  
Single Crystal ◽  
Succinic Acid ◽  
Slow Evaporation Technique ◽  
Absorption Studies ◽  
Dta Analysis ◽  
Evaporation Technique ◽  
Ft Ir ◽  
Ir Spectroscopic ◽  
Thermal Stability Of

Growth of optically transparent single crystals of thiourea succinic acid (TUSA) was grown successfully from aqueous solution by slow evaporation technique. The crystal structure was elucidated using the single crystal XRD. The various functional groups and the modes of vibrations were identified by FT-IR spectroscopic analysis. The optical absorption studies indicate that the optical transparency window is quite wide making its suitable for NLO applications. Thermal stability of the crown crystal carried out by TGA-DTA analysis.

Thermal Behaviour of Candesartan Active substance and in pharmaceutical compounds

2017 ◽  
Vol 68 (8) ◽  
pp. 1895-1902
Author(s):  
Ioana Cristina Tita ◽  
Eleonora Marian ◽  
Bogdan Tita ◽  
Claudia Crina Toma ◽  
Laura Vicas
Keyword(s):  
Thermal Behaviour ◽  
Active Substance ◽  
Pharmaceutical Research ◽  
Pharmaceutical Product ◽  
Nitrogen Atmosphere ◽  
Pure Substance ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Ft Ir

Thermal analysis is one of the most frequently used instrumental techniques in the pharmaceutical research, for the thermal characterization of different materials from solids to semi-solids, which are of pharmaceutical relevance. In this paper, simultaneous thermogravimetry/derivative thermogravimetry (TG/DTG) and differential scanning calorimetry (DSC) were used for characterization of the thermal behaviour of candesartan cilexetil � active substance (C-AS) under dynamic nitrogen atmosphere and nonisothermal conditions, in comparison with pharmaceutical product containing the corresponding active substance. It was observed that the commercial samples showed a different thermal profile than the standard sample, caused by the presence of excipients in the pharmaceutical product and to possible interaction of these with the active substance. The Fourier transformed infrared spectroscopy (FT-IR) and X-ray powder diffraction (XRPD) were used as complementary techniques adequately implement and assist in interpretation of the thermal results. The main conclusion of this comparative study was that the TG/DTG and DSC curves, together with the FT-IR spectra, respectively X-ray difractograms constitute believe data for the discrimination between the pure substance and pharmaceutical forms.

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