Investigations into the function of sticky rice on the microstructures of hydrated lime putties

Lime mortars – The role of carboxymethyl cellulose on the crystallization of calcium carbonate

A large number of studies have been devoted to the preparation of different morphologies of NaCl crystals. In this work, we first use DNA as an additive to prepare hopper-like NaCl crystals and modulate the size of these hopper-like NaCl crystals using silver nitrate. This work helps us not only to understand the growth of NaCl crystals, but also to use DNA as an additive to design and synthesize different crystal structures.

DNA action on the growth and habit modification of NaCl crystals

Sticky rice lime mortar-inspired in situ sustainable design of novel calcium-rich activated carbon monoliths for efficient SO2 capture

Biowaste eggshells are a valuable source of calcium carbonate suitable for various applications. In this study, spherical vaterite and calcite calcium carbonate polymorphs have been synthesised from discarded eggshells by the precipitation technique at ambient temperature. The influence of initial salt concentration with different polyelectrolytes such as ethylene glycol (EG), polyethylene glycol (PEG, 600 and 6000), and poly(sodium 4-styrenesulfonate) (PSS) at various w/v% concentrations on the polymorph crystal formation of precipitated calcium carbonate (PCC) particles was studied. The results indicated that PCC crystals with spherical, star-shaped and yarn shaped morphologies can be obtained based on the concentration of calcium ions and the presence of different polyelectrolyte solution. At low salt molar concentration, PEG-6000 and PSS polyelectrolytes were found to promote the formation of spherical vaterite calcium carbonate particles with particle mean diameters of 5.05 μm and 2.17 μm, respectively. Furthermore, silver nanoparticles were also loaded into the PCC particles in situ, and the surface area significantly increased from 2.2813 m2 g−1 in untreated ground eggshells to 30.4632 m2 g−1 in PCC particles in the presence of PSS and silver colloid solution. The EDS mapping revealed the average wt% of silver atoms loaded in PCC particles in the presence of PSS polyelectrolyte was lower (1.44 wt%) than in the presence of PEG-6000 (4.27 wt%) due to the silver encapsulation possibility during the core–shell formation, as confirmed by SEM images. The silver nanoparticle-loaded PCC particles in this study can be incorporated into the polymer matrix and employed for antimicrobial food packaging or wound dressing application.

/pdf/tuning-polymorphs-of-precipitated-calcium-carbonate-from-3iee6ykx.pdf

Tuning polymorphs of precipitated calcium carbonate from discarded eggshells: effects of polyelectrolyte and salt concentration

Rhombohedral calcium carbonate (CaCO3) crystals with lamellar texture have been obtained by employing sticky rice polysaccharide as an additive in the growth medium. The results in this work indicate that the morphology of the CaCO3 crystals changes with mineralization conditions, such as the concentration of calcium ions (Ca2+), reaction time, and temperature. The rhombohedral CaCO3 crystals with specific lamellar texture are prepared using a sticky rice solution mass fraction of 0.5%, a Ca2+ concentration of 0.4 mol L−1, a reaction time of 2 h and a reaction temperature of 25 °C. In addition, most of the CaCO3 particles are calcite when mineralized in the solution of sticky rice. The possible formation process of the CaCO3 crystals with lamellar texture is proposed. It may be ascribed to the preference for sticky rice solution and self-assembly of CaCO3 particles. The interesting sticky rice polysaccharide can be extended to prepare other composites.

Controlled crystallization of lamellar calcium carbonate crystals induced by solution of sticky rice polysaccharide (from Oryza sativa)

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Controlled crystallization of lamellar calcium carbonate crystals induced by solution of sticky rice polysaccharide (from Oryza sativa)