scholarly journals Synthesis and characterization of yttrium aluminium garnet (YAG) powders

2007 ◽  
Vol 1 (1-2) ◽  
pp. 69-74 ◽  
Author(s):  
Magdalena Zarzecka-Napierala ◽  
Krzystof Haberko
Keyword(s):  
Aqueous Solution ◽  
Phase Composition ◽  
Citric Acid ◽  
Ethylene Glycol ◽  
Synthesis And Characterization ◽  
Yttrium Aluminium Garnet ◽  
Yttrium Aluminium ◽  
Ft Ir ◽  
Complexing Properties

In this paper synthesis and characterization of YAG powders, prepared by a process based on complexing properties of citric acid, was reported. Influence of citric acid estrification induced by 2-propanol or ethylene glycol on the system homogeneity was investigated. These reagents were introduced to aqueous solution of yttrium and aluminium nitrates. A variety of powders from Al2O3-Y2O3 system with different phase composition were obtained by altering the citrate to nitrate ratio. Evolution of the powders phase composition vs. temperature was investigated using DTA/TG, XRD, and FT-IR methods. The most interesting results were observed in case of the citric acid - propanol - relative nitrates system. The mole ratio of these reagents equal to 1: 2.5: 2.5 (nitrates (Al,Y): citric acid: 2-propanol) allowed to synthesize pure YAG phase powders at temperature as low as 950?C.

Synthesis and characterization of a polyester based on citric acid/ethylene glycol/glycerol

2021 ◽  
pp. 1-9
Author(s):  
A. Olarte-Paredes ◽  
A. M. Salgado-Delgado ◽  
J.J. García-Fuentes ◽  
R. Salgado-Delgado ◽  
G. Cedillo-Valverde ◽  
...  
Keyword(s):  
Citric Acid ◽  
Ethylene Glycol ◽  
Synthesis And Characterization

scholarly journals Synthesis and Characterization of Fluorescent Polyoxometalate Nano-/Microrods

2010 ◽  
Vol 65 (5) ◽  
pp. 603-606 ◽  
Author(s):  
Yan Shen ◽  
Jun Peng ◽  
Changyun Chen ◽  
Dan Chen ◽  
Huanqiu Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Elemental Analysis ◽  
Synthesis Method ◽  
Synthesis And Characterization ◽  
Average Ratio ◽  
Intense Fluorescence ◽  
Ft Ir

Fluorescent nano-/microrods of the polyoxometalate (POM) K4H[Eu(α-SiW11O39)- (H2O)2] ・ 17H2O were obtained in aqueous solution by a conventional synthesis method. The nano-/microrods have been characterized by elemental analysis and FT-IR, UV/Vis, and TG-DTA data, and their morphology was examined by ESEM-FEG, showing that the average ratio of diameter to length is 1 : 20. The obtained nano-/microrods exhibit a regular profile and an intense fluorescence.

scholarly journals SYNTHESIS AND CHARACTERIZATION OF CROSSLINKED POLYACRYLAMIDE (PAAM)-CARRAGEENAN HYDROGELS SUPERBASORBENT PREPARED BY GAMMA RADIATION

2010 ◽  
Vol 10 (1) ◽  
pp. 12-19 ◽  
Author(s):  
Erizal Erizal
Keyword(s):  
Aqueous Solution ◽  
Gamma Rays ◽  
Room Temperature ◽  
Synthesis And Characterization ◽  
Optimum Conditions ◽  
Medium Ph ◽  
Gel Fraction ◽  
Ft Ir ◽  
Poly Acrylamide

A series of superabsorbent hydrogels were prepared from acrylamide and carrageenan by gamma irradiation at room temperature. Carrageenan solutions with different concentration (0.5%, 1%, 1.5%, 2%) have been blended with 5% of acrylamide and irradiated at doses 20-40 kGy. The properties of the prepared hydrogel were evaluated in terms of the gel fraction and the kinetics swelling was studied. It was found that the incorporation only 2% carrageenan (kappa) with 5% acrylamide can produces an elastic hydrogel when irradiated with gamma rays up to 40 kGy. Under optimum conditions, poly(acrylamide)-carrageenan hydrogels with gel fraction ~ 60% and optimum swelling 250 g/g were prepared gamma radiolyticcally from aqueous solution containing 5% acrylamide and 2% carrageenan at the doses 20-40 kGy. The FT-IR spectra indicated that network of irradiated PAAM-carrageenan hydrogel was in the semi IPN structure. The hydrogels were also found to be sensitive to ionic strength of the medium, pH and temperature.   Keywords: carrageenan, acrylamide, irradiation, superbasorbent, crosslinking

Synthesis and Characterization of Hydrophobic Modification Guar Gum

2014 ◽  
Vol 952 ◽  
pp. 121-124 ◽  
Author(s):  
Feng Chen ◽  
Xu Guang Wang ◽  
Ren Shu Yang
Keyword(s):  
Aqueous Solution ◽  
Ir Spectra ◽  
Apparent Viscosity ◽  
Guar Gum ◽  
Synthesis And Characterization ◽  
Hydrophobic Modification ◽  
Ft Ir ◽  
Long Chain

The HMG GG-C14 was prepared by pre-swelling guar gum hydrophobic modification in alcohol-aqueous solution, the optical reactive condition was determined by studying the respective influence of each condition on the performance of the resultant product, and the final product possessed an apparent viscosity of 19957mPa·s (the apparent viscosity of parent guar gum is 11764mPa·s) and a substituting degree of 0.93%. The Ft-IR spectra of GG and GG-C14 indicate the hydrophobic long chain alkyl was successfully grafted onto guar gum.

Sign in / Sign up

Export Citation Format

Share Document