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Browsing 2008 by Issue Date

Browsing 2008 by Issue Date

Now showing items 1-20 of 172

Structural and superconducting properties of bulk MgB2 with added nano Tb4O7

Vinod, K; Neson Varghese; Syamaprasad, U; Shipra; Sundaresan, A (IOP Publishing, 2008)

Bulk MgB2 samples with 0, 1, 5 and 10 wt% of Tb4O7 nanoparticles added were prepared by a powder-in-sealed-tube (PIST) method. X-ray diffraction (XRD) analysis showed small quantities of TbB4, Tb2O3, Mg and MgO as impurities ...
Mechanical properties and water sorption behavior of phenol-formaldehyde hybrid composites reinforced with banana fiber and glass fiber

Seena Joseph; Sreekala, M S; Peter Koshy; Sabu Thomas (Wiley, 2008)

Banana fiber, which is rich in cellulose, relatively inexpensive, and abundantly available, has potential for polymer reinforcement. This study explores the merits of combining high-modulus glass fibers with banana fiber ...
Synthesis and characterization of rubber-seed-oil-based polyurethanes

Bakare, I O; Pavithran, C; Okieimen, F E; Pillai, C K S (Wiley, 2008)

Novel biobased polyurethanes were synthesized from rubber seed oil (RSO), a renewable resource. The RSO monoglyceride, together with xylene and hexamethylene diisocyanate (HMDI), was employed to synthesize the desired ...
Simultaneous estimation of phenolic acids in sea buckthorn (Hippophae rhamnoides) using RP-HPLC with DAD

Ranjith, A; Sarin Kumar, K; Arumughan, C (Elsevier, 2008)

A RP-HPLC-DAD method was developed and validated for the simultaneous analysis of nine phenolic acids including gallic acid, protocatechuic acid, p-hydroxybenzoic acid, vanillic acid, salicylic acid, p-coumaric acid, ...
Fatty acid profiling during microbial lipid production under varying pO(2) and impeller tip speeds

Ahmed, S U; Singh, S K; Pandey, A; Kanjilal, S; Prasad, R B N (Springer, 2008)

The fatty acid profile study was undertaken to study the effect of impeller tip speed-associated shear stress and dissolved oxygen saturation (DO) on the fatty acid composition variation and on total lipid content of the ...
Solvent-induced aggregation and cation-controlled self-assembly of tripodal squaraine dyes: Optical, chiroptical and morphological properties

Chithra, P; Regi Varghese; Divya, K P; Ajayaghosh, A (Wiley, 2008)

The synthesis, characterisation, optical, chiroptical, aggregation, and alkaline earth metal cation assisted self-assembly properties of tripodal squaraine dyes have been described. In the tripodal geometry, these dyes ...
Hydroxyl-functionalized polyaniline nanospheres: Tracing molecular interactions at the nanosurface via vitamin C sensing

Anilkumar, P; Jayakannan, M (American Chemical Society, 2008)

Here, we report a synthesis of novel polyaniline nanospheres bearing mono- and bishydroxyl functional groups were to trace the molecular interactions at the nanosurfaces through vitamin C sensing. Two new aniline monomers ...
Organogels as scaffolds for excitation energy transfer and light harvesting

Ajayaghosh, A; Praveen, V K; Vijayakumar, C (Royal Society of Chemistry, 2008)

The elegance and efficiency by which Nature harvests solar energy has been a source of inspiration for chemists to mimic such process with synthetic molecular and supramolecular systems. The insights gained over the years ...
Controlled self-assembly of squaraines to 1D supramolecular architectures with high molar absorptivity

Ajayaghosh, A; Chithra, P; Reji Varghese; Divya, K P (Royal Society of Chemistry, 2008)

A tailor made squaraine dye 1 upon binding with Ca2+ self-assembles to form a spherical micellar assembly that reorganises to thermodynamically stable 1D cylindrical rods with high molar absorptivity.
Studies on crystallization and cross-linking of lipase for biocatalysis

Akhila Rajan; Emilia Abraham, T (Springer, 2008)

The development of robust biocatalysts with increased stability and activity is a major challenge to industry. A major breakthrough in this field was the development of cross-linked enzyme crystals with high specificity ...
Renewable resource-based poly (m-phenylenevinylene)s and their statistical copolymers: Synthesis, characterization, and probing of molecular aggregation and Forster energy transfer processes

Anish Cyriac; Amrutha, S R; Jayakannan, M (Wiley, 2008)

We report a novel poly (m-phenylenevinylene)s and their copolymers based on renewable resource starting material 3-pentadecylphenol to trace the Forster energy transfer process and molecular aggregation in the pi-conjugated ...
Pyridine-catalyzed stereoselective addition of acyclic 1, 2-diones to acetylenic esters: Synthetic and theoretical studies of an unprecedented rearrangement

Abhilash, N P; Suresh, C H; Vijay Nair, G (Wiley, 2008)

A systematic study of the addition of various 1,2-acyclic diones to activated acetylenic esters catalyzed by pyridine under mild conditions is described. This reaction provides a new protocol for the stereoselective synthesis ...
A facile aqueous sol-gel process for the synthesis of alumina-lanthanum phosphate nanocomposite

Rajesh Komban; Baiju, K V; Jayasankar, M; Warrier, K G K (Wiley, 2008)

A facile aqueous sol-gel process is being reported for the first time for the synthesis of alumina-lanthanum phosphate (Al(2)O(3)-LaPO(4)) nanocomposite. X-ray diffraction (XRD) analysis confirms the absence of any reactive ...
Long-lived photoinduced charge separation in new Ru(bipyridine) (2+)(3)-phenothiazine dyads

Ajayakumar, G; Gopidas, K R (Royal Society of Chemistry, 2008)

Synthesis and photophysical properties of three Ru(bpy)(3)(2+)-Ptz (bpy = 2,2'-bipyridine and Ptz = phenothiazine) dyads, where the number of Ptz groups increased from one to three, are reported. The MLCT absorption bands ...
Coronarin D, a labdane diterpene, inhibits both constitutive and inducible nuclear factor-kappa B pathway activation, leading to potentiation of apoptosis, inhibition of invasion, and suppression of osteoclastogenesis

Ajaikumar, B K; Ichikawa, H; Preetha Anand; Mohankumar, C J; Hema, P S; Mangalam S Nair; Aggarwal, B B (Amer Assoc Cancer Research, 2008)

Compounds isolated from members of the Zingiberaceae family are traditionally used as a medicine against inflammatory diseases, but little is known about the mechanism. Here, we report the isolation and structural ...
Ca(4)La(2)Ti(5)O(17): a novel low loss dielectric ceramics in the CaO-La(2)O(3)-TiO(2) system

Rejini, R; Subodh, G; Sebastian, M T (Springer, 2008)

A novel low loss dielectric material Ca(4)La(2)Ti(5)O(17) was prepared by solid state ceramic route. The structure and microstructure of the Ca(4)La(2)Ti(5)O(17) ceramics was investigated using XRD, SEM and EDX techniques. ...
1D molecular ladder of the ionic complex of terbium-4-sebacoylbis(1-phenyl-3-methyl-5-pyrazolonate) and sodium dibenzo-18-crown-6: Synthesis, crystal structure, and photophysical properties

Remya, P N; Biju, S; Reddy, M L P; Cowley, A H; Findlater, M (American Chemical Society, 2008)

On the basis of the novel heterocyclic beta-diketone, 4-sebacoylbis(1-phenyl-3-methyl-5-pyrazolone (H2SbBP), three new lanthanide complexes Tb-2(SbBP)(3)(H2O)(2) (1), Gd-2(SbBP)(3)(H2O)(2) (2), and [Tb(SbBP)(2)] [Na(DB18C6)H2O] ...
C-H bond activation through sigma-bond metathesis and agostic interactions: Deactivation pathway of a Grubbs second-generation catalyst

Jomon Mathew; Koga, N; Suresh, C H (American Chemical Society, 2008)

A mechanistic study has been carried out to explore the structural and energetic features leading to the decomposition pathways of a Grubbs second-generation olefin metathesis catalyst using density functional theory. The ...
Improved microstructure and flux pinning properties of Gd-substituted (Bi,Pb)-2212 superconductor sintered between 846 and 860 degrees C

Vinu, S; Sarun, PM; Shabna, R; Biju, A; Syamaprasad, U (Elsevier, 2008)

The influence of sintering temperature on microstructural and superconducting properties of Gd-substituted (Bi,Pb)-2212 superconductor was investigated. It is found that the microstructure of the system can be tailored and ...
Solid state optical properties of 4-alkoxy-pyridine butadiene derivatives: Reversible thermal switching of luminescence

Saleesh Kumar, N S; Shinto Varghese; Rath, N P; Suresh Das (American Chemical Society, 2008)

The synthesis and optical properties of a series of alkoxyphenyl-pyridyl butadiene derivatives in solution and in the solid state are described. All the derivatives were practically nonfluorescent in solution but showed ...

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