Rheo-optical FT-IR spectroscopy of solid poly(acrylic acid) films

1999 ◽  
Vol 146 (1) ◽  
pp. 47-53 ◽  
Author(s):  
Amar A. Mavinkurve
Keyword(s):  
Ir Spectroscopy ◽  
Acrylic Acid ◽  
Ft Ir ◽  
Ft Ir Spectroscopy ◽  
Poly Acrylic Acid

Immobilization of urease in poly(1-vinyl imidazole)/poly(acrylic acid) network

2010 ◽  
Vol 64 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Mehmet Şenel ◽  
Agah Coşkun ◽  
M. Fatih Abasıyanık ◽  
Ayhan Bozkurt
Keyword(s):  
Acrylic Acid ◽  
Enzyme Immobilization ◽  
Storage Stability ◽  
Polymer Network ◽  
Ft Ir ◽  
Basic Characteristics ◽  
And Storage ◽  
Menten Constant ◽  
Ft Ir Spectroscopy ◽  
Poly Acrylic Acid

AbstractIn this study, urease was immobilized in a polymer network obtained by complexation of poly(1-vinyl imidazole) (PVI) with poly(acrylic acid) (PAA). Preparation of the polymer network was monitored by FT-IR spectroscopy. Scanning electron microscopy (SEM) revealed that enzyme immobilization had a strong effect on film morphology. Proton conductivity of the PVI/PAA network was measured via impedance spectroscopy under humidified conditions. Values of the Michaelis-Menten constant (K M) for immobilized urease were higher than for the free enzyme, indicating a decreased affinity of the enzyme to its substrate. The basic characteristics (pHopt, pHstability, T opt, T stability, reusability, and storage stability) of immobilized urease were determined. The results show that the PAA/PVI polymer network is suitable for enzyme immobilization.

scholarly journals Swelling Behaviour of Starch-g-Acrylic Acid Hydrogel and its Potential Application in Removal of Rhodamine B and Alkali Blue Dyes

2021 ◽  
Vol 18 (2) ◽  
pp. 98-104
Author(s):  
S. Yahaya ◽  
Z.I.S.G. Adiya ◽  
S. S. Adamu ◽  
H.B. Bature ◽  
I.B. Ibrahim
Keyword(s):  
Ir Spectroscopy ◽  
Acrylic Acid ◽  
Rhodamine B ◽  
Dye Adsorption ◽  
Batch Adsorption ◽  
Scanning Calorimetry ◽  
Adsorption Method ◽  
Ft Ir ◽  
Percentage Removal ◽  
Ft Ir Spectroscopy

Starch-g-acrylic acid hydrogel was prepared by free radical polymerization technique adopting potassium persulphate (KPS) as an initiator and N’N-methylenebisacrylamide (MBA) as a linking agent. The aim of the research is to inspect the potentials of starch-based hydrogel in remediating wastewater. Fourier Transform Infrared (FT-IR) spectroscopy was used to find the formation of hydrogel while Differential Scanning Calorimetry (DSC) and Scanning Electron Microscopy (SEM) were used for the characterization of the hydrogel. The FT-IR spectroscopy confirmed hydrogel formation. The DSC results showed that the generated hydrogel is thermally stable, and the SEM depicts a good porous site for dye adsorption. Batch adsorption for Rhodamine B (RDB) and Alkali blue (AB) dyes under the variation of contact time was 105 minutes for both dyes with percentage removal of 89.80 and 60.32%, adsorbent dose was 0.4 and 0.8 g with percentage removal of 86.42 and 57.95%, concentration was 50 and 30 ppm with percentage removal of 67.01 and 77.18% and pH was 8 for both dyes with percentage removal of 77.43 and 79.13% as the optimum. The results indicates that acrylic acid monomer was efficiently grafted on the starch, and the adsorption method correlated with Freundlich isotherm equation. It was concluded that the starch-based hydrogel is an appropriate adsorbent and can be explored for industrial wastewater treatment.

Membranes Prepared from a Blend of Poly(acrylic Acid) and Natural Rubber-Graft-Poly(vinyl Alcohol) (PAA/NR-g-PVA)

2010 ◽  
Vol 93-94 ◽  
pp. 268-271 ◽  
Author(s):  
Wilairat Wongthep ◽  
Chaiwat Ruksakulpiwat ◽  
Sittipong Amnuaypanich
Keyword(s):  
Ir Spectroscopy ◽  
Acrylic Acid ◽  
Natural Rubber ◽  
Water Concentration ◽  
Poly Vinyl Alcohol ◽  
Latex Particles ◽  
Degree Of Swelling ◽  
Blend Membranes ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

The blend membranes from PAA and NR-graft-PVA were prepared. By introducing potassium persulfate (KPS) initiator, PVA can be chemically attached to the NR latex particles which was confirmed by FT-IR spectroscopy. Most of added-PVA was grafted on the NR latex particles as indicated by the almost-linear increasing of grafting percentage. The swelling of the PAA/NR-g-PVA blend membranes was performed in different concentrations of water-ethanol solutions. For the water concentration lesser than 30 vol.%, all membranes showed almost no-swelling but beyond 30 vol.% water, the degree of swelling revealed the substantial swelling with the degree of swelling increased as PAA content in the membrane increased.

Multiscale exploration of hydrocarbons adsorption and hopping through the ZSM-5 channels - from Monte Carlo modelling to experiment

2021 ◽  
Author(s):  
Maciej Strzempek ◽  
Karolina A. Tarach ◽  
Kinga Góra-Marek ◽  
Fernando Rey ◽  
Miguel Palomino ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Ir Spectroscopy ◽  
Aliphatic Hydrocarbons ◽  
Adsorption Studies ◽  
Ft Ir ◽  
Gravimetric Adsorption ◽  
Hydrocarbons Adsorption ◽  
Ft Ir Spectroscopy

Abstract In this article the results of the statistical MC modelling corroborated by the FT-IR spectroscopy and gravimetric adsorption studies of the low aliphatic hydrocarbons in ZSM-5 (Si/Al =28 or...

scholarly journals Vibrational Spectroscopic Investigation of Blood Plasma and Serum by Drop Coating Deposition for Clinical Application

2021 ◽  
Vol 22 (4) ◽  
pp. 2191
Author(s):  
Jing Huang ◽  
Nairveen Ali ◽  
Elsie Quansah ◽  
Shuxia Guo ◽  
Michel Noutsias ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Outer Ring ◽  
Imaging Method ◽  
Fluorescence Lifetime Imaging ◽  
Drying Process ◽  
Vibrational Signal ◽  
Coating Deposition ◽  
Ft Ir ◽  
Sample Droplet ◽  
Ft Ir Spectroscopy

In recent decades, vibrational spectroscopic methods such as Raman and FT-IR spectroscopy are widely applied to investigate plasma and serum samples. These methods are combined with drop coating deposition techniques to pre-concentrate the biomolecules in the dried droplet to improve the detected vibrational signal. However, most often encountered challenge is the inhomogeneous redistribution of biomolecules due to the coffee-ring effect. In this study, the variation in biomolecule distribution within the dried-sample droplet has been investigated using Raman and FT-IR spectroscopy and fluorescence lifetime imaging method. The plasma-sample from healthy donors were investigated to show the spectral differences between the inner and outer-ring region of the dried-sample droplet. Further, the preferred location of deposition of the most abundant protein albumin in the blood during the drying process of the plasma has been illustrated by using deuterated albumin. Subsequently, two patients with different cardiac-related diseases were investigated exemplarily to illustrate the variation in the pattern of plasma and serum biomolecule distribution during the drying process and its impact on patient-stratification. The study shows that a uniform sampling position of the droplet, both at the inner and the outer ring, is necessary for thorough clinical characterization of the patient’s plasma and serum sample using vibrational spectroscopy.

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