Formation of uniform and monodisperse zincite crystals in the presence of soluble starch

Advanced Nano-biocomposites Based on Starch

“…However, starch-based biocomposites reinforced by this LDH at a low loading level (6 wt %) were reported to show obviously improved mechanical properties (increased tensile strength) and water resistance (decreased WVP) (Wu et al 2011). There are two reasons for the improvement: (a) because polysaccharides could form complexes with metal ions due to the high number of coordinating functional groups (hydroxyl and glucoside groups) (Taubert and Wegner 2002), strong associations between the metal ions and the CMC occurred for the nucleation and initial crystal growth of the LDH, and thus the LDH was successfully encapsulated by the CMC and (b) the hydrophilic CMC component and the smaller size of each LDH stack allowed the LDH to be well dispersed in the starch matrix and good interactions between the nanofiller and the matrix were formed because of the CMC component (Wu et al 2011). However, the biocomposites displayed a decrease in the thermal decomposition temperature because the weak thermal stability of the CMC could weaken the interactions between the LDH filler and the starch matrix and facilitate the decomposition of the starch (Wu et al 2011).…”

“…For the nanoparticle synthesis in the second method, polysaccharides such as native starch (Rodriguez et al 2008), soluble starch (Chairam et al 2009;Li et al 2007;Ma et al 2009;Radhakrishnan et al 2007;Vigneshwaran et al 2006;Wei et al 2004), and CMC Liu et al 2011a;Yu et al 2009;Zheng et al 2009a) have been shown to be good stabilizers. Polysaccharides can form complexes with divalent metal ions due to their high number of coordinating functional groups (hydroxyl and glucoside groups) (Taubert and Wegner 2002) and present dynamic supramolecular associations facilitated by inter-and intramolecular hydrogen bonding, which can act as templates for metal nanoparticle growth (Raveendran et al 2003). As a result, metal ions can preferentially be associated with a polysaccharide, of which the nucleating effect can promote the initial crystal growth of the metal oxide, improve the stability of the nanoparticles in water, and prevent the aggregation of the nanoparticles Yu et al 2009;Zheng et al 2009a).…”

Fabrication and Characterization of Sb2O3/Carboxymethyl Cellulose Sodium and the Properties of Plasticized Starch Composite Films

“…It is well known that polysaccharides may form complexes with metal ions due to their coordinating functional groups (hydroxyl and glucoside groups). [16] Furthermore, polysaccharides presented dynamic supramolecular associations facilitated by inter-and intra-molecular hydrogen bonding, which could act as templates for nanoparticle growth. [17] For the two possible causes identified above, it was likely that the majority of antimony ions were closely associated with the P. R. Chang, J. Yu, X. Ma …”

Bioinspired Mineralization of Inorganics from Aqueous Media Controlled by Synthetic Polymers

“…Although some examples have shown the effect of biogenic macromolecules, such as starch (a polysaccharide), [23] or gelatin (a protein), [24] most of the research has focused on the influence of synthetic polymers, including double-hydrophilic block copolymers, [25][26][27][28] graft polymers, [9,12,13] surface-functionalized latexes, [14] and polyacrylamides. [29] In early work, it was studied how a diblock copolymer of ethylene oxide (EO) and methacrylic acid (MAA) with formula (EO) 68 -b-(MAA) 8 affects the morphology of precipitated ZnO crystals, by comparing the influence of the copolymers with the influence of poly(ethylene oxide) (PEO) and poly(methacrylic acid) (PMAA) homopolymers.…”