Shape Controlled Synthesis of Barium Carbonate Microclusters and Nanocrystallites using Natural Polysachharide – Gum Acacia

Abstract

Different morphosynthesis strategies for BaCO 3 using natural polysaccharide-gum acacia (GA) as templating species are presented. The influence of GA with different functionalities such as -OH, -COOH and -NH 2 on the crystallization and structure formation was investigated. Some interesting morphologies, including rods, dumbbell, double-dumbbell and flower like clusters, can be readily generated by using GA as cooperative modifier in the mineralization process, under the conditions of 0.5%, 1% of templating species and at ambient temperature. The modifier GA and its concentration is the key factor in this system. In continuation, morphology was also examined for mixed metal carbonates (Ba-LaCO 3 , Ba-TbCO 3 ). The possible formation mechanism of the nanocrystallites is discussed. Structural characterization of the synthesized materials was investigated by Powder X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive Analysis (EDAX), Transmission Electron Microscopy (TEM), Thermogravimetric analysis (TGA) coupled Mass (MS) and Fourier Transform Infrared spectroscopy (FT-IR).

Green synthesis of gum-acacia assisted gold-hydroxyapatite nanostructures – Characterization and catalytic activity

“…loss) in the temperature range 250e650 C can be attributed due to the decomposition of gum acacia. From our earlier studies it was confirmed by TGA-MS studies, that the evolution of CO 2 during this step is due to the decomposition of eCOOH functional groups present in GA [63]. TGA profiles of HAp synthesized with and without gum acacia (Fig.…”

Synthesis of Barium Carbonate Using Phthalic Acid and Isophthalic Acid as Morphology Adjust Control Agent

“…This is in agreement with the FT-IR results. It may also be seen that the peak (111) is the strongest in all the BaCO3 crystals synthesized using different adjusters and adjuster concentration, suggesting that BaCO3 crystals are well oriented and grew mainly along the (111) face [12]. In order to further confirm the polymorphs of the as-prepared products in the presence of PA and IPA, the as-prepared products were characterized by FT-IR spectroscopy and the corresponding results are shown in Figure 2 respectively.…”

“…Spherical BaCO3 crystal can be used for the production of PTC thermistor, which makes capacitors with high dielectric constant and temperature characteristics so that it can exhibit the advantages of small PTC thermistor, high-frequency, highcapacity, and so on [9], which means that different morphologies often have different properties and applications even for the same substance. Therefore, controlled morphology, size and uniform distribution of ultrafine BaCO3powder have attracted more and more research interest [6,[10][11][12]. Control of nucleation, growth, organization of crystals to a superstructure can make their physical properties tunable, which are important for technical application.…”

Insulin-Loaded Barium Salt Particles Facilitate Oral Delivery of Insulin in Diabetic Rats

“…The presence of the desired elements in the samples would confirm the formation of the respective particles. Elemental analysis of BaSO 4 ( Figure 4a O bond and peak at 1059 cm −1 is attributed to the symmetric C-O stretching vibration [28], thus indicating the formation of BaCO3 particles.…”