scholarly journals Preparation Of Carboxymethyl Cellulose/Acrylamide Copoly-Mer Hydrogel Using Gamma Radiation And Investigation Of Its Swelling Behavior

2013 ◽  
Vol 25 (2) ◽  
pp. 132-138 ◽  
Author(s):  
S Sultana ◽  
MR Islam ◽  
NC Dafader ◽  
ME Haque
Keyword(s):  
Radiation Dose ◽  
Gamma Radiation ◽  
Carboxymethyl Cellulose ◽  
Saline Solution ◽  
Chemical Society ◽  
Swelling Ratio ◽  
Swelling Properties ◽  
Preparation Conditions ◽  
Maximum Value ◽  
Gel Fraction

Acrylamide (AAm)/carboxymethyl cellulose (CMC) blend hydrogels have been prepared by the application of gamma radiation from C0-60 source at room temperature (27°C). The preparation conditions such as effect of CMC concentration and radiation dose on gel fraction and swelling behaviors were investigated. The maximum value of gel fraction is obtained at 25 kGy radiation dose. The swelling properties were investigated in distilled water, saline solution (NaCl) and buffer medium. The maximum swelling value of hydrogel was obtained at 48 hours in water. The swelling ratio of hydrogel decreased with increase in concentration of NaCl in swelling medium. In buffer, it was found that swelling ratio increased with increase in pH of medium. Journal of Bangladesh Chemical Society, Vol. 25(2), 132-138, 2012 DOI: http://dx.doi.org/10.3329/jbcs.v25i2.15065

scholarly journals PREPARATION OF CARBOXYMETHYL CELLULOSE AND POLYVINYL ALCOHOL (CMC/PVA) HYDROGELS USING FREEZE−THAW PROCESSES FOR ADSORPTION OF Zn2+ AND Cu2+

2021 ◽  
Vol 55 (3-4) ◽  
pp. 375-383
Author(s):  
NEDA PAVANDI ◽  
ELHAM TAGHAVI ◽  
NAVIDEH ANARJAN
Keyword(s):  
Polyvinyl Alcohol ◽  
Carboxymethyl Cellulose ◽  
Numerical Optimization ◽  
Polynomial Equations ◽  
Swelling Ratio ◽  
Process Variables ◽  
Freeze Thaw ◽  
Gel Fraction ◽  
Zero Order Kinetics ◽  
Order Polynomial

"The preparation of carboxymethyl cellulose and polyvinyl alcohol (CMC/PVA) composites is proposed in the present work. The CMC/PVA hydrogels were prepared using freeze−thaw processes. The effects of freezing time and of the number of freeze−thaw cycles on the swelling ratio and gel fraction of achieved hydrogels were evaluated using response surface methodology. The multiple regression analysis suggested second order polynomial equations as models for predicting changes of the studied hydrogel characteristics by selected process variables, with relatively high coefficients of determination (R2 > 0.82). The numerical optimization suggested that freezing the polymer solutions for 5 h and repeating the freeze−thaw process for 5 times would give the most desirable hydrogels with highest either swelling ratio or gel fraction. Remarkably, the ion adsorption studies showed that the adsorption of Cu2+ and Zn2+ ions by the hydrogels obeys zero order kinetics and the high capability of the produced optimum hydrogels to adsorb selected ions from synthetic waste was confirmed."

scholarly journals Study on the Swelling Behavior of Gamma Radiation Induced Acrylamide/Carboxymethyl Cellulose Blend Hydrogel in Urea Solution.

2016 ◽  
Vol 64 (2) ◽  
pp. 105-108
Author(s):  
Salma Sultana ◽  
Kumkum Habib ◽  
M Rabiul Islam ◽  
Nirmal Chandra Dafader ◽  
M Emdadul Haque ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Water Absorption ◽  
Carboxymethyl Cellulose ◽  
Room Temperature ◽  
Urea Solution ◽  
Distilled Water ◽  
Equilibrium Water Content ◽  
Swelling Properties ◽  
Carboxymethyl Cellulose Sodium ◽  
Radiation Induced

Swelling behaviors of crosslinked acrylamide (AAm)/carboxymethyl cellulose sodium salt (CMC) blend hydrogels synthesized using gammaradiation from Co-60 source in aqueous solutions of urea were investigated. The parameters like effect of radiation dose and concentration of CMC in AAm/CMC blend were studied on swelling properties. Swelling experiments were performed in various concentrations of urea solution and distilled water at room temperature. The swelling properties of hydrogels increased with increased concentration of CMC but it decreased with increased radiation dose. Hydrogels showed enormous swelling in aqueous solution of urea. The swelling properties of AAm/CMC hydrogel were lower in distilled water than that of in urea solution. The water absorption of AAm/CMC blend hydrogels increased from ~4,800 to ~9,000% for the concentration range of CMC from 0 to 7% for 48 hours standing in distilled water at 25 kGy radiation dose. It was also found that water absorption by AAm hydrogel with 7% CMC decreased from ~13,800 to ~8,500% for the radiation range from 15 to 35 kGy for 48 hours standing time in water. The equilibrium water content (EWC) of AAm/CMC blend hydrogel depended on radiation dose. EWC decreased from ~0.9935 to ~0.9896 with the variation of radiation dose from 15 to 35 kGy in 0.01M urea solution at 48 hours. Dhaka Univ. J. Sci. 64(2): 105-108, 2016 (July)

scholarly journals SYNTHESIS OF POLYETHYLENE OXIDE (PEO)–CHITOSAN HYDROGEL PREPARED BY GAMMA RADIATION TECHNIQUE

2011 ◽  
Vol 11 (1) ◽  
pp. 16-20 ◽  
Author(s):  
Erizal Erizal ◽  
Thamrin Wikanta
Keyword(s):  
Gamma Radiation ◽  
Wound Dressing ◽  
Chemical Properties ◽  
Antimicrobial Activities ◽  
Swelling Ratio ◽  
Chitosan Hydrogel ◽  
Elongation At Break ◽  
Gel Fraction ◽  
Radiation Technique ◽  
Chitosan Hydrogels

Crosslinked PEO hydrogel containing chitosan for wound dressing has been prepared by gamma radiation technique. Chitosan solutions with different concentration (0.5-2% w/v) have been blended with 5% aqueous solution of PEO and irradiated at the doses 20-40 kGy by gamma rays. The copolymers were characterized by Fourier transform infra red spectroscopy and their physico-chemical properties of hydrogels were evaluated in terms of gel fraction, swelling ratio, elongation at break and antimicrobial activities. It was found that under maximum condition of incorporation 1% chitosan with irradiation dose of 20 kGy, PEO-chitosan hydrogels with high gel fraction (85%), swelling ratio (10 g/g) and elongation at break (145%) were obtained. The examination of the microbe penetration shows that the prepared hydrogels can be considered as a good barrier against microbes. Thus, PEO-chitosan hydrogel showed satisfactory properties for use as a wound dressing.

Optimization of gamma radiation dose for induction of mutations in okra

2021 ◽  
pp. 1-11
Author(s):  
Soham Hazra ◽  
Shouvik Gorai ◽  
V Umesh Kumar ◽  
Sudip Bhattacharya ◽  
Anirban Maji ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Gamma Radiation ◽  
Gamma Radiation Dose

DISINFESTATION OF MANGOES HADEN IN-FESTED BY Anastrepha fraterculus (WIED., 1830) (DIPTERA, TEPHRITIDAE), WITH GAMMA RADIATION

2021 ◽  
Vol 9 (1A) ◽  
Author(s):  
Valter Arthur
Keyword(s):  
Relative Humidity ◽  
Radiation Dose ◽  
Gamma Radiation ◽  
Adult Stage ◽  
Mangifera Indica ◽  
Lethal Dose ◽  
Adult Emergence ◽  
Climate Chamber ◽  
Anastrepha Fraterculus

The objective of experiment was determinate the radiation dose for disinfestation to mango Mangifera indica cv. Haden, infested by Anastrepha fraterculus larvae. For realization of the experiment, were collected fruits in the field, which were taking to Entomology laboratory where there was a infestation by the flies in cages during 72 hours period. Waited for the development of the larvae and before 5 – 8 days to infestation, the mangos were irradiated in a Cobalt-60 source with doses of: 0(control), 50, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1.100, 1.200 and 1.300 Gy. After the irradiation, the fruits were placed in climate chamber with 25 ±5°C of temperature and 70±5% of relative humidity, posteriorly waited the larvae exit to out of the fruit until the transformation in pupae and posteriorly in adult stage. By the results obtained our can concluded that the lethal dose to larvae in mangoes infested with 5-8 days after infestation were 600 Gy and 1.000 Gy (0.6 and 1 kGy) respectively. The dose of 50 Gy prevented the total adult emergence for both treatments. 

scholarly journals Terrestrial Gamma Radiation Dose Rate of West Sarawak

2017 ◽  
Vol 156 ◽  
pp. 00006
Author(s):  
A. Izham ◽  
A.T. Ramli ◽  
W.M. Saridan Wan Hassan ◽  
H.N. Idris ◽  
N.A. Basri
Keyword(s):  
Radiation Dose ◽  
Gamma Radiation ◽  
Dose Rate ◽  
Radiation Dose Rate ◽  
Gamma Radiation Dose

Calculations of Background Beta-Gamma Radiation Dose Through Geologic Time

1999 ◽  
Vol 77 (6) ◽  
pp. 662-667 ◽  
Author(s):  
P. Andrew Karam ◽  
Stephen A. Leslie
Keyword(s):  
Radiation Dose ◽  
Gamma Radiation ◽  
Geologic Time ◽  
Gamma Radiation Dose

scholarly journals Chemical and Physical Properties of Cassava Starch–CM-Chitosan–Acrylic Acid Gel Copolymerization by Gamma Irradiation

2014 ◽  
Vol 14 (1) ◽  
pp. 37-42
Author(s):  
Gatot Trimulyadi Rekso
Keyword(s):  
Acrylic Acid ◽  
Irradiation Dose ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Γ Irradiation ◽  
Equilibrium Degree ◽  
Preparation Conditions ◽  
Gel Fraction ◽  
Gelatinized Starch ◽  
Acid Gel

Starch is a renewable natural polymer that can be decomposed easily in the environment and can be modified to various applications such as biomedical, agricultural and pharmaceutical applications. Copolymerization of gelatinized starch–CM-chitosan and acrylic acid (AAc) in aqueous medium using γ-irradiation was carried out. The preparation conditions, such as irradiation dose and AAc concentration were investigated. The copolymers were characterized by FTIR spectroscopy, thermo-gravimetric analysis (TGA) and scanning electron microscopy (SEM). The results show that by increasing of irradiation dose the gel fraction increases till the dose of 15 kGy. Above the stating dose the gel fraction decreases. The Equilibrium Degree of Swelling (EDS) value slightly increases with increasing irradiation dose and after dose of 15 kGy is decreasing. The swelling of starch–CM-chitosan–AAc hydro gels reduced as the gel content increases. The results indicated that the optimum condition for obtaining hydro gels with desirable properties was irradiated at dose of 15 kGy. The results indicated that SEM revealed that the higher the dose, the lower the copolymer pore size. The starch–CM-chitosan–AAc copolymers have thermal stability higher than that for starch individually.

scholarly journals Synthesis of Polyvinyl Pirrolidone (PVC) /Κ-Carrageenan Hydrogel Prepared by Gamma Radiation Processing As a Function of Dose and PVP Concentration

2013 ◽  
Vol 13 (1) ◽  
pp. 41-46 ◽  
Author(s):  
Erizal Erizal ◽  
Tjahyono Tjahyono ◽  
Dian PP ◽  
Darmawan Darmawan
Keyword(s):  
Tensile Strength ◽  
Gamma Radiation ◽  
Water Absorption ◽  
Chemical Change ◽  
Wound Dressings ◽  
Water Evaporation ◽  
Radiation Processing ◽  
Elongation At Break ◽  
Gel Fraction ◽  
Radiation Technique

The aim of this research is to prepare a biomaterial to be used in health care. A series of hydrogels based on polyvinyl pyrrolidone (PVP)/κ-Carrageenan (KC) has been prepared by radiation technique. PVP (5-15%) were mixed with ΚC (2%) and irradiated by gamma rays at the doses from 25 kGy to 35 kGy (dose rate 7 kGy/h) at room temperature. The chemical change of hydrogels was characterized using Fourier Transform infra Red (FTIR). Gel fraction, water absorption and water evaporation were determined gravimetrically. Tensile strength and elongation at break was measured using Instron meter. It was found that with the increase irradiation dose and PVP concentration, the gel fraction and tensile strength of hydrogels increase. In contrast the elongation at break and water absorption of hydrogels decrease. The hydrogel of PVP/KC hydrogel produced by gamma radiation can be considered for wound dressings.

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