02094nas a2200241   4500008004100000022001400041245009900055210006900154260008400223300001200307490000800319520120900327653001301536653001801549653002701567653001901594653002001613653002101633100001701654700003101671700002001702856013001722       2006                        eng d  a1549-329600aPreparation and characterization of novel hybrid of chitosan-g-lactic acid and montmorillonite0 aPreparation and characterization of novel hybrid of chitosanglac  aDIV JOHN WILEY & SONS INC, 111 RIVER ST, HOBOKEN, NJ 07030 USAbWILEY-LISScAUG  a372-3820 v78A3 a<p>The utilization of biopolymers and the development of organic-inorganic hybrids are ever increasing interest of material science researchers around the globe for various applications. The present attempt is intended to prepare nanocomposites of lactic acid grafted chitosan and layered silicates. Nanocomposites were prepared by dissolving chitosan and dispersing sodium montmorillonite in aqueous solution of L-lactic acid with subsequent heating and film casting. They were characterized by conventional techniques such as Fourier transform infrared spectroscopy, X-ray diffractometry, thermogravimetric analysis, energy dispersive X-ray spectroscopy, and elemental analysis. The results from polar optical and transmission electron microscopic measurements are also discussed. Sorption behavior of samples has been followed by measuring swelling degree and contact angle. The films have shown enhanced hydrophilicity when compared with polylactic acid (PLA). Issues on the interactions of polycationic chitosan with clay are also discussed. It is observed that nanocomposites are exhibiting better thermal and physical properties than neat chitosang-LA and PLA. (c) 2006 Wiley Periodicals, Inc.</p>10aChitosan10acontact angle10agraft copolymerization10aNanocomposites10apolylactic acid10awater absorption1 aDepan, Dilip1 aKumar, Annamalai, Pratheep1 aSingh, Raj, Pal  uhttps://library.ncl.res.in/content/preparation-and-characterization-novel-hybrid-chitosan-g-lactic-acid-and-montmorillonite-002137nas a2200253   4500008004100000022001400041245012900055210006900184260005700253300001400310490000700324520121300331653001501544653001401559653001901573653001801592653001801610653002201628100003101650700002801681700002601709700002001735856012801755       2010                        eng d  a1598-503200aPreparation and characterization of bioceramic nanocomposites based on hydroxyapatite (HA) and carboxymethyl cellulose (CMC)0 aPreparation and characterization of bioceramic nanocomposites ba  a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcDEC  a1160-11670 v183 a<p>We report the synthesis of biomimetic nanocomposites based on carboxymethyl cellulose (CMC) and hydroxyapatite (HA) nanoparticles via a co-precipitation method. Physico-chemical characterization was performed before and after calcination by Fourier transform infrared (FTIR) spectroscopy, solid state (31)P nuclear magnetic resonance (NMR) spectroscopy, and thermogravimetric analysis (TGA). The formation of nanocomposites was observed by wide angle X-ray diffraction (WAXD), scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDX), and transmission electron microscopy (TEM). The spectral and crystallographic data indicated the formation of hydroxyapatite in the presence of CMC. They were observed as aggregates of HA nanoparticles and CMC, whose sizes were approximately similar to 260 +/- 40 nm. The crystallite size of the hydroxyapatite particles decreased (with 2 wt% 18 +/- 3 nm) with increasing CMC content. The morphological aspects of the calcined samples revealed the sintering ability of HA nanoparticles. Nanocomposites of hydroxyapatite nanoparticles that mimic the process of nucleation and growth in nature can be prepared using biomacromolecules such as CMC.</p>10abiopolymer10acellulose10ahydroxyapatite10aNanoparticles10aParticle size10aX-ray diffraction1 aKumar, Annamalai, Pratheep1 aMohaideen, Kamal, Khaja1 aAlariqi, Sameh, A. S.1 aSingh, Raj, Pal  uhttps://library.ncl.res.in/content/preparation-and-characterization-bioceramic-nanocomposites-based-hydroxyapatite-ha-and-0