Preparation and physical properties of functional barium carbonate nanostructures by a facile composite-hydroxide-mediated route

Shahid, Tauseef; Arfan, Muhammad; Zeb, Aurang; Bibi, Tayyaba; Khan, Taj Muhammad

doi:10.1177/1847980418761775

Cited by 23 publications

(12 citation statements)

References 37 publications

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“…The SEM image of the single-phase converted solid obtained from Ba(OH)2•8H2O (Fig. 8) displayed that all converted barium carbonate particles had rod-like morphology, as for different barium carbonates prepared in the previous literature studies (Xu and Xue, 2006;Shamsipur et al, 2013;Shahid et al, 2018). It could also be seen from Fig.…”

Section: Resultssupporting

confidence: 60%

Direct conversion of alkaline earth metal hydroxides and sulfates to carbonates in ammonia solutions

Ehsani¹,

Ehsani²,

Üçyıldız³

et al. 2021

Physicochem. Probl. Miner. Process.

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In this study, the direct conversion behaviors of different alkaline earth metal solids (the hydroxides and the sulfates of alkaline earth metals Ca, Sr, Ba and Mg) to their corresponding carbonates in dissolved carbonate-containing pregnant solutions obtained by direct leaching of a smithsonite (ZnCO3) ore sample in aqueous ammonia solutions having different concentrations (4 M, 8 M and 13.3 M NH3) were investigated by using X-ray diffraction analyses at alkaline earth metal to dissolved carbonate mole ratios of 1:1 and 1:2, for revealing the conversion possibilities of dissolved carbonate in the pregnant solutions to solid carbonate by-products. The results of direct conversion experiments showed that Ca(OH)2, CaSO4•2H2O, Sr(OH)2•8H2O and Ba(OH)2•8H2O converted to their corresponding carbonates, SrSO4 partially converted to SrCO3 as observed by the presence of unreacted SrSO4 peaks in X-ray diffraction patterns of the converted solids, and BaSO4 did not convert to BaCO3 because of its lower solubility with respect to BaCO3. On the other hand, it was observed that Mg(OH)2 did not convert to MgCO3, but MgSO4•7H2O converted dominantly to an uncommon phase, which was tentatively identified as Mg5Zn3(CO3)2(OH)12•H2O. In the study, a complete discussion on the conversion behaviors of alkaline earth metal solids to their corresponding carbonates was given considering the differences between their solubility product constants and the changes in the free energies of the theoretical conversion reactions. In addition, infrared spectra and scanning electron microscope images of some of the converted solids were also presented for characterization purposes.

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Section: Resultssupporting

confidence: 60%

Direct conversion of alkaline earth metal hydroxides and sulfates to carbonates in ammonia solutions

Ehsani¹,

Ehsani²,

Üçyıldız³

et al. 2021

Physicochem. Probl. Miner. Process.

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“…In the BT spectrum a complex band is present in the range 1700–1250 cm −1 . The main component at 1444 cm −1 [ 45 ], due to the normal vibration of carbonate groups, is overlapped to the signals of residual acetates in the range 1550–1300 cm −1 [ 46 , 47 , 48 ]. The band at 1630 cm −1 is due to the water scissoring vibration of adsorbed water.…”

Section: Resultsmentioning

confidence: 99%

Effect of Hydrothermal Treatment and Doping on the Microstructural Features of Sol-Gel Derived BaTiO3 Nanoparticles

et al. 2021

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Barium Titanate (BaTiO3) is one of the most promising lead-free ferroelectric materials for the development of piezoelectric nanocomposites for nanogenerators and sensors. The miniaturization of electronic devices is pushing researchers to produce nanometric-sized particles to be embedded into flexible polymeric matrices. Here, we present the sol-gel preparation of crystalline BaTiO3 nanoparticles (NPs) obtained by reacting barium acetate (Ba(CH3COO)2) and titanium (IV) isopropoxide (Ti(OiPr)4). The reaction was performed both at ambient conditions and by a hydrothermal process carried on at 200 °C for times ranging from 2 to 8 h. Doped BaTiO3 nanoparticles were also produced by addition of Na, Ca, and Bi cations. The powders were annealed at 900 °C in order to improve NPs crystallinity and promote the cubic-to-tetragonal (c⟶t) phase transformation. The microstructural features of nanoparticles were investigated in dependence of both the hydrothermal reaction time and the presence of dopants. It is found that short hydrothermal treatment (2 h) can produce BaTiO3 spherical and more homogeneous nanoparticles with respect to longer hydrothermal treatments (4 h, 6 h, 8 h). These particles (2 h) are characterized by decreased dimension (approx. 120 nm), narrower size distribution and higher tetragonality (1.007) in comparison with particles prepared at ambient pressure (1.003). In addition, the short hydrothermal treatment (2 h) produces particles with tetragonality comparable to the one obtained after the longest process (8 h). Finally, dopants were found to affect to different extents both the c⟶t phase transformation and the crystallite sizes.

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“…The Kubelka-Munk model was employed to determine the energy bandgap "E g " of Ni 1−x Al x O nanoparticles. The Kubelka-Munk F(R) 2 and Tauc's relation are given in Eqs 3 and 4 below (Shahid et al, 2018). where "n" represents an exponent which is "2" for indirect and " 1 /2" for direct bandgap transition, "h" is Plank's constant, "hυ" is the energy associated with photon in eV and "R" nanoparticles, which could be attributed to the increased particle size.…”

Section: Optical Propertiesmentioning

confidence: 99%

Chemical Synthesis and Antipseudomonal Activity of Al-Doped NiO Nanoparticles

et al. 2021

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Synthesis of efficient antibacterial agents has become extremely important due to the emergence of antibiotic resistant bacteria. This is especially true for Pseudomonas aeruginosa, an opportunistic pathogen having ability to rapidly develop resistance to multiple classes of antibiotics thus limiting the efficacy of antibiotics approved for clinical use. Aluminum (Al)-doped NiO nanoparticles are of special interest due to their enhanced antipseudomonal properties at certain Al-doping levels. The composite hydroxide mediated (CHM) approach was opted for the synthesis of pure nickel oxide (NiO) and Al-doped nickel oxide (Ni1–xAlxO; x = 5, 10, 15, 20, 25, and 30 wt.%) nanoparticles. X-ray diffraction (XRD) technique was used for structural analysis of these nanoparticles. Morphology and elemental composition of these nanoparticles were investigated by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy, respectively. The optical properties were investigated by using UV-visible spectroscopy and Kubelka-Munk Theory and Tauc relation were employed for energy bandgap calculation of these nanoparticles. The antibacterial activity of representative Al-doped NiO nanoparticles was assessed on multidrug-resistant clinical P. aeruginosa strains. The agar well and disc-diffusion methods were used to assess the antibacterial efficacy of (Al)-doped NiO compared to pure NiO nanoparticles. Interestingly, a gradual increase in the antibacterial activity was observed with increasing Al-doping concentration and the highest antibacterial activity was observed at x = 15 wt.% Al-doping concentration. The antipseudomonal efficacy of Ni1–xAlxO nanoparticles was comparable to aztreonam antibiotic, primarily used for Gram-negative bacterial infections. Hence, it is proposed that these nanoparticles can be used for coating surgical devices, bone prostheses, medical implants, antibacterial clothing and in pharmaceutical formulations as burn ointments to produce the antimicrobial effect.

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Preparation and physical properties of functional barium carbonate nanostructures by a facile composite-hydroxide-mediated route

Cited by 23 publications

References 37 publications

Direct conversion of alkaline earth metal hydroxides and sulfates to carbonates in ammonia solutions

Direct conversion of alkaline earth metal hydroxides and sulfates to carbonates in ammonia solutions

Effect of Hydrothermal Treatment and Doping on the Microstructural Features of Sol-Gel Derived BaTiO3 Nanoparticles

Chemical Synthesis and Antipseudomonal Activity of Al-Doped NiO Nanoparticles

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