scholarly journals Preparation and Property of Xylan/Poly(Methacrylic Acid) Semi-Interpenetrating Network Hydrogel

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Xiao-Feng Sun ◽  
Yang Feng ◽  
Xiaodi Shi ◽  
Yaxiong Wang
Keyword(s):  
Methacrylic Acid ◽  
Chemical Structure ◽  
Sem Analysis ◽  
Swelling Kinetics ◽  
Interpenetrating Network ◽  
Structure And Morphology ◽  
Dynamic Swelling ◽  
Ft Ir ◽  
Biomedical Fields ◽  
Ft Ir Spectroscopy

Xylan/poly(methacrylic acid) semi-interpenetrating network hydrogels were synthesized, and these hydrogels were fabricated using various ratios of xylan and methacrylic acid and cross-linked by N,N′-methylenebisacrylamide. The chemical structure and morphology of the prepared hydrogels were characterized by FT-IR spectroscopy and SEM analysis. The porous structure of the prepared hydrogels was found, and the interconnected porous channels increased when the content of xylan was increased in the hydrogels. The hydrogels presented excellent pH sensitivity and swelling reversibility. The dynamic swelling kinetics were also studied, and all obtained results indicated that the prepared xylan/poly(methacrylic acid) semi-IPN hydrogel could be used in biomedical fields, especially for drug release.

scholarly journals Incorporation of silver stearate nanoparticles in methacrylate polymeric monoliths for hemeprotein isolation

2020 ◽  
Vol 18 (1) ◽  
pp. 399-411
Author(s):  
Eman Alzahrani
Keyword(s):  
Noble Metals ◽  
Extraction Process ◽  
Sem Analysis ◽  
X Ray ◽  
Polymeric Scaffold ◽  
Extended Surface ◽  
Unique Method ◽  
Unique Approach ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

AbstractA unique method was used to synthesize extremely stable silver stearate nanoparticles (AgStNPs) incorporated in an organic-based monolith. The facile strategy was then used to selectively isolate hemeproteins, myoglobin (Myo) and hemoglobin (Hb). Ethyl alcohol, silver nitrate, and stearic acid were, respectively, utilized as reducing agents, silver precursors, and capping agents. The color changed to cloudy from transparent, indicating that AgStNPs had been formed. AgStNP nanostructures were then distinctly integrated into the natural polymeric scaffold. To characterize the AgStNP–methacrylate polymeric monolith and the silver nanoparticles, energy-dispersive X-ray (EDX), scanning electron microscopy (SEM), and Fourier-transform infrared (FT-IR) spectroscopy were used. The results of the SEM analysis indicated that the AgStNP–methacrylate polymeric monolith’s texture was so rough in comparison with that of the methacrylate polymeric monolith, indicating that the extraction process of the monolith materials would be more efficient because of the extended surface area of the absorbent. The comparison between the FT-IR spectra of AgStNPs, the bare organic monolith, and AgStNP–methacrylate polymeric monolith confirms that the AgStNPs were immobilized on the surface of the organic monolith. The EDX profile of the built materials indicated an advanced peak of the Ag sequence which represented an Ag atom of 3.27%. The results therefore established that the AgStNPs had been successfully integrated into the monolithic materials. Extraction efficiencies of 92% and 97% were used to, respectively, recover preconcentrated Myo and Hb. An uncomplicated method is a unique approach of both fabrication and utilization of the nanosorbent to selectively isolate hemeproteins. The process can further be implemented by using other noble metals.

Characteristics of Konjac Glucomannan (KGM) in A.bulbifer Compared with that in A.rivieri and A.albus

2011 ◽  
Vol 236-238 ◽  
pp. 2045-2052 ◽  
Author(s):  
Qiao Wang ◽  
Jian Wang ◽  
Geng Zhong
Keyword(s):  
Chemical Structure ◽  
Average Molecular Weight ◽  
Konjac Glucomannan ◽  
Water Soluble ◽  
Soluble Dietary Fiber ◽  
Physiochemical Properties ◽  
Ft Ir ◽  
Main Component ◽  
Ft Ir Spectroscopy ◽  
Southwest Part

Amorphophallus bulbifer (A. bulbifer) is a promising species in Amorphophallus sp., with great potentiality of developing, low risk for cultivation and considerable commercial benefits, mainly locates in tropical and subtropical regions or near the equator. Konjac glucomannan (KGM) is the main component of Amorphophallus tuber which is a water-soluble dietary fiber. In this work, some physiochemical properties of KGM in three Amorphophallus species flour [one was A.bulbifer, the other two were current main species namely Amorphophallus rivieri (A. rivieri) and Amorphophallus albus (A. albus)] were studied and compared with each other. The KGM content in A. rivieri, A. albus and A. bulbifer flour were 85.03%, 76.28% and 88.07% (w/w), respectively. The apparent viscosity, viscosity average molecular weight, whiteness, gel-forming properties and chemical structure of KGM in the three flours were investigated by using viscometer, colorimeter, texture analyzer and Fourier transform infrared (FT-IR) spectroscopy. The results indicated that the viscosity and Mw of A. bulbifer was the largest, gel strength was almost same (p>0.05) and the molecular structure were of no differences of three KGM. It may be proposed that transplanting A. bulbifer from its native land in the tropical and subtropical regions to temperate zone in the southwest part of China would be feasible, and it would cause the revolution of Amorphophallus sp. and more considerable benefits.

Preparation and Characterization Studies of Amorphophallus paeonifolius and Manihot esculenta as a Bioplastic using Glycerol and Agar-Agar as Plasticizer

2020 ◽  
Vol 36 (6) ◽  
pp. 1205-1211
Author(s):  
J. Morris Princey ◽  
A. Nandhini ◽  
E. Abinaya
Keyword(s):  
Manihot Esculenta ◽  
Fossil Fuel ◽  
Corn Starch ◽  
Fats And Oils ◽  
Sem Analysis ◽  
Saw Dust ◽  
Ft Ir ◽  
Characterization Studies ◽  
Uv Visible ◽  
Ft Ir Spectroscopy

Bio-plastics are biodegradable materials which can be obtained from the renewable sources such as corn starch, straw, vegetable fats and oils, wood-chips, recycled food waste, saw dust etc. They can be used as an alternative to the commercial plastics in the market which contaminate our environment. Now-a-days bio-plastics are worldwide popular due to its concern towards the environment, limited fossil fuel resources and the climatic change. The purpose of this study is to assess the properties of the starch based bio-plastics prepared from Amorphophallus paeonifolius and Manihot esculenta using glycerol and agar-agar as the plasticizers. The synthesized bio-plastic was characterized with the help of UV-Visible spectrophotometer, FT-IR spectroscopy and SEM Analysis.

scholarly journals Chemical and Spectral Characterization of The Ozonation Products of κ-Carrageenan

2018 ◽  
Vol 156 ◽  
pp. 05006 ◽  
Author(s):  
Aji Prasetyaningrum ◽  
Bakti Jos ◽  
Yudhy Dharmawan ◽  
Ratih V. Octaviani ◽  
Ratnawati Ratnawati
Keyword(s):  
Chemical Structure ◽  
Biological Activities ◽  
Uv Spectra ◽  
Ozone Treatment ◽  
Ft Ir ◽  
Forced Air ◽  
Absorbance Peak ◽  
Ozonation Process ◽  
Ft Ir Spectroscopy

Kappa (κ-) carrageenan oligomers are known to have several biological activities. Recent progress in the development of modified κ-carrageenan has resulted low molecular of κ-carrageenan. Ozone is a powerful oxidant and considered for depolymerization of κ-carrageenan. However, few studies have investigated the changes in κ-carrageenan properties associated with ozone treatment. This study would investigate on the changes in chemical structure after ozonation process. The experiments were carried out in a glass reactor equipped with an ozone bubble diffuser. Ozone with concentration of 80 ± 2 was bubbled into the solution. The ozone treatment was conducted at different times, i.e., 0 (control), 5, 10, 15, and 20 minutes. The experiments were conducted at pH 7 and constant stirring speed (200 rpm). Ozone-treated κ-carrageenan was dried at 60 ºC for 24 h in a forced air oven. The chemical and spectral analyses of κ-carrageenan after ozonation process were carried out using UV-Vis and FT-IR spectroscopy. These changes are seen in the UV spectra as a high intensity of absorbance peak at 290 nm. It is shows that ozonation of κ-carrageenan leads to some chemical changes such as the formation of carbonyl, carboxyl or double bonds.The FT-IR spectra reveals that the chemical structure of degraded κ-carrageenan, in term of sulfate content, is only slightly affected by the ozone treatment.

Preparation and characterization of cross-linked poly (vinyl alcohol)-graphene oxide nanocomposites as an interlayer for Schottky barrier diodes

2018 ◽  
Vol 32 (01) ◽  
pp. 1750276 ◽  
Author(s):  
Lida Badrinezhad ◽  
Çigdem Bilkan ◽  
Yashar Azizian-Kalandaragh ◽  
Ali Nematollahzadeh ◽  
İkram Orak ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Ir Spectroscopy ◽  
Chemical Interaction ◽  
Low Frequency ◽  
Sem Analysis ◽  
Poly Vinyl Alcohol ◽  
X Ray Diffraction ◽  
Voltage Dependent ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Cross-linked polyvinyl alcohol (PVA) graphene oxide (GO) nanocomposites were prepared by simple solution-mixing route and characterized by Raman, UV–visible and fourier transform infrared (FT-IR) spectroscopy analysis, X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The XRD pattern and SEM analysis showed significant changes in the nanocomposite structures, and the FT-IR spectroscopy results confirmed the chemical interaction between the GO filler and the PVA matrix. After these morphological characterizations, PVA-GO-based diodes were fabricated and their electrical properties were characterized using current–voltage (I–V) and impedance-voltage-frequency (Z-V-f) measurements at room temperature. Semilogarithmic I–V characteristics of diode showed a good rectifier behavior. The values of C and G/[Formula: see text] increased with decreasing frequency due to the surface/interface states (N[Formula: see text]) which depend on the relaxation time and the frequency of the signal. The voltage, dependent profiles of N[Formula: see text] and series resistance (R[Formula: see text]) were obtained from the methods of high-low frequency capacitance and Nicollian and Brews, respectively. The obtained values of N[Formula: see text] and R[Formula: see text] were attributed to the use of cross-linked PVA-GO interlayer at the Au/n-Si interface.

scholarly journals Functional polyketones for the removal of calcium and magnesium from water (Part II): cross-linking and functional characterization

2017 ◽  
Vol 89 (1) ◽  
pp. 51-60 ◽  
Author(s):  
Patrick A. Figaroa ◽  
Henk Miedema ◽  
Gert-Jan Euverink ◽  
Francesco Picchioni
Keyword(s):  
Chemical Structure ◽  
Chemical Nature ◽  
Divalent Cations ◽  
Functional Characterization ◽  
Hard Water ◽  
Cross Link ◽  
Removal Capacity ◽  
Ft Ir ◽  
Capacity Performance ◽  
Ft Ir Spectroscopy

AbstractFunctional polyketones were chemically cross-linked for the softening of hard water, i.e. for the removal of the divalent cations Ca2+ and Mg2+. Elemental analysis, FT-IR spectroscopy, solubility- and swelling-experiments were used to demonstrate the occurrence of the cross-link reaction. Testing the different compounds for their Ca2+ and Mg2+ removal capacity assessed the structure-functionality of the polymers. The corresponding water-insoluble resins were then tested for their Ca2+ and Mg2+ removal capacity-performance being explained in terms of their chemical structure. Ion adsorption of these polymers is not based on an ion exchange, the prevailing mechanism for most currently existing adsorption resins. Rather, the amino functionalized polymers synthesized here adsorb cations as well as their accompanying anionic counterparts, possibly through a chelating mechanism. The obtained results show that functional polyketones are promising in this context as they are easily tunable with the chemical nature of the N-containing groups determining the affinity of the polymer for Ca2+ and/or Mg2+.

FT-IR Spectroscopy and Hydrogen Bonding Interactions in Poly(styrene-co-methacrylic acid)/Poly(styrene-co-4-vinyl pyridine) Blends

2005 ◽  
Vol 230 (1) ◽  
pp. 39-50 ◽  
Author(s):  
Khaled ElMiloudi ◽  
Mourad Benygzer ◽  
Said Djadoun ◽  
Nicolas Sbirrazzuoli ◽  
Serge Geribaldi
Keyword(s):  
Hydrogen Bonding ◽  
Ir Spectroscopy ◽  
Methacrylic Acid ◽  
Hydrogen Bonding Interactions ◽  
Vinyl Pyridine ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Hemocompatibility and Surface Morphology of Vegetable Oil Based Polyurethane Eggshell Powder Nanocomposite

2021 ◽  
Vol 37 (1) ◽  
pp. 229-234
Author(s):  
K. J. Jasmine Jerlite ◽  
N. T. Nevaditha
Keyword(s):  
Weight Loss ◽  
Ir Spectroscopy ◽  
Surface Morphology ◽  
Olive Oil ◽  
Chemical Resistance ◽  
Sem Analysis ◽  
Ft Ir ◽  
Polyurethane Nanocomposites ◽  
Polyurethane Matrix ◽  
Ft Ir Spectroscopy

In the present work, biocompatible polyurethane (PU) and PU – based nanocomposites (PUENs) of different composition have been synthesized from hydroxylated olive oil- based polyurethane and eggshell powder as filler. The synthesized polyurethane nanocomposites are characterized by FT-IR spectroscopy, SEM and XRDanalysis. The chemical resistance and biodegradability of the PUENs have been studied in different chemical environments. SEM analysis confirms the incorporation of eggshell powder into the polyurethane matrix. TheXRD study reveals that the intensity of the peak increases from 90 to 137 cts with the increase in crystallinity. The chemical resistance shows the swelling and degradation of the PUENs at higher concentration of the HCl and NaOH. Insoil burial degradation method 13 %-18% of weight loss is observed in PUEN3 and PUEN4. The hemolytic rate of PUEN4 is <2% at 10 to 40µg/ml showing non-hemolysis, implies better hemocompatibility of the sample.

scholarly journals SODIUM LAURETH SULFATE (SLS) DECORATED α-PbO NANOCRYSTALS: OPTICAL, STRUCTURE, AND MORPHOLOGY, PROPERTIES

2021 ◽  
Vol 22 (2) ◽  
pp. 71
Author(s):  
Tikarahayu Putri ◽  
Iwan Syahjoko Saputra ◽  
Anjar Hermadi Saputro ◽  
Yogi Nopiandi Permana ◽  
Yoki Yulizar ◽  
...  
Keyword(s):  
Crystal Size ◽  
Lead Nitrate ◽  
Absorption Peak ◽  
Particle Charge ◽  
One Pot ◽  
Structure And Morphology ◽  
Ft Ir ◽  
Synthesis Approach ◽  
Optical Structure ◽  
Ft Ir Spectroscopy

SODIUM LAURETH SULFATE (SLS) DECORATED α-PbO NANOCRYSTALS: OPTICAL, STRUCTURE, AND MORPHOLOGY PROPERTIES. The α-PbO nanocrystals were successfully decorated using sodium laureth sulfate (SLS) anionic surfactant. The method used is one-pot synthesis approach. The precursor used is lead nitrate (Pb(NO3)2). The UV-Vis spectrophotometer showed the absorption peak of α-PbO nanocrystals was seen at wavelength of 237 nm and an absorbance value of 0.7. The optical properties of PbO nanocrystals can be seen at the bandgap value of 4.2 eV. FT-IR spectroscopy showed the shift of absorption peak at the wavenumber of 1358 cm-1. XRD spectroscopy showed the crystals of PbO at diffraction angles (2θ) of 10-80o: 29.17, 32.54, 37.85, 39.62, 45.16, 46.21, 56.12, and 61.73 with miller indices of (111), (200), (201), (121), (220), (030), (311), and (032), respectively. The crystal size average of PbO was 56.32 nm. The results of PSA and PZC shows the particle size distribution of PbO is 71.5 nm with inter-particle charge of -25 mV. SEM-EDX data shows the PbO nanocrystals have an irregularly spherical with a compounds composition of Pb (83.12%) and O (16.88%). From the data of characterization, it can be concluded the PbO nanocrystals was successfully decorated using the surfactant anionic of sodium laureth sulfate.

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