Junaid, Bushiri M; Wilson, E V; Vaidyan, V K(June , 2010)
[+]
[-]
Abstract:
Urolithiasis is identified to be a major urological disorder affecting people all over the world irrespective of their age, sex and race. Urinary stone samples resected from the urinary bladders of two patients belonging to tropical region, Kollam District of Kerala State, India are investigated by using XRD,SEM, EDAX, TGA, DSC and FTIR to understand its chemical structure. Uric acid shows exothermic peak around 432°C is due to the decomposition with the evolution of CO and cracking of the remaining products. Results of analytical studies reveal that samples under investigation consist mainly in uric acid and hydrated uric acid. Hydrogen bonding exists in hydrated uric acid samples
Description:
Journal of Optoelectronics and Biomedical Materials Vol. 2, Issue 2, June 2010, p. 85 - 90
Junaid, Bushiri M; Wilson, E V; Vaidyan, V K(Elsevier, June 11, 2010)
[+]
[-]
Abstract:
Urinary stones resected from urinary bladders of patients hailing from Kollam district of Kerala State, India
were analyzed by SEM, XRD and by thermal analysis techniques. The analytical results indicate that,
stones have different composition, i.e., calcium phosphate, calcium phosphate hydroxide and sodium
calcium carbonate. Infrared spectral studies also reveal the presence of phosphates or carbonates in
these samples. Further, IR spectral investigations have revealed that amorphous carbonated species are
occupied in PO4 sites in calcium phosphate type stone and OH sites in calcium phosphate hydroxide
sample. Thermal studies of these samples also reveal that, carbon dioxide is released from carbonated
samples upon heating which is related to amount of carbon content and bond strength. Crystals with
defects and irregular morphology are grown inside the urinary bladder due to variation in crystal growth
conditions
Anantharaman, M R; Saravanan, S; Venkatachalam, S; Avasthi, D K(Elsevier, March 26, 2007)
[+]
[-]
Abstract:
Polyaniline thin films prepared by RF plasma polymerisation were irradiated with 92MeV Si ions for various fluences of 1 1011,
1 1012 and 1 1013 ions/cm2. FTIR and UV–vis–NIR measurements were carried out on the pristine and Si ion irradiated polyaniline
thin films for structural evaluation and optical band gap determination. The effect of swift heavy ions on the structural and optical
properties of plasma-polymerised aniline thin film is investigated. Their properties are compared with that of the pristine sample. The
FTIR spectrum indicates that the structure of the irradiated sample is altered. The optical studies show that the band gap of irradiated
thin film has been considerably modified. This has been attributed to the rearrangement in the ring structure and the formation of CRC
terminals. This results in extended conjugated structure causing reduction in optical band gap