Sonochemical effect on size reduction of CaCO3 nanoparticles derived from waste eggshells

Hassan, Tarig A.; Rangari, Vijay K.; Rana, Rohit Kumar; Jeelani, Shaik

doi:10.1016/j.ultsonch.2013.01.016

Cited by 77 publications

(62 citation statements)

References 47 publications

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“…Char is also responsible for the impermeability of volatile components which accelerates combustion . ENP is porous in nature, hence, it can permit the infiltrations of volatile components to accelerate thermal decomposition. However, delays in 5% decomposition is due blockage of the pores by early stage char formation.…”

Section: Resultsmentioning

confidence: 99%

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Eggshell reinforced biocomposite—An advanced “green” alternative structural material

Tiimob

Jeelani

Rangari

2015

J of Applied Polymer Sci

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ABSTRACT:The need for bio-based polymers as substitutes to recalcitrant petroleum sourced plastics is ever growing, because of increase in demand globally. Eggshell nanopowder (ENP) prepared using mechanical attrition and ultrasound irradiation was used to infuse a bio-based polymer [Super Sap 100/1000 epoxy (SSE)] for possible enhancement of its mechanical properties. The ENP, neat SSE and SSE/ENP composites were characterized using X-ray Diffraction, Transmission Electron Microscopy (TEM), Energy dispersive spectroscopy (EDS), Scanning Electron Microscopy, Thermogravimetic Analysis (TGA), Dynamic Mechanical Analysis (DMA), Thermomechanical Analysis (TMA) and flexure analysis. TEM and EDS analysis showed evidence of ENP in the SSE matrix whiles DMA and TMA analysis revealed significant improvements (7-22%) in the storage moduli and (3-17%) in coefficient of thermal expansion (CTE) respectively. Also, major delay in 5% decomposition temperatures and increases in char yields were observed in TGA analysis. The flexure strength, modulus, and toughness significantly improved by 6-31%, 11-37%, and 10-36%, respectively. Microstructure of fractured surfaces showed deflected crack paths which contributed to improve toughness. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43124.

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Section: Resultsmentioning

confidence: 99%

“…However, another report showed improvement in thermal stability with bioplast GS 2189 . The increase in residue is because of the presence of proportionate amount of CaO from the transformation of ENP in the composites at higher temperature and char from the matrix which contributed to retard thermal degradation …”

Section: Resultsmentioning

confidence: 99%

Eggshell reinforced biocomposite—An advanced “green” alternative structural material

Tiimob

Jeelani

Rangari

2015

J of Applied Polymer Sci

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“…Beyond plant sources, a combination of ball-milling and ultrasound can reduce other organic material sources such as waste eggshells into calcium carbonate nanoparticles (Hassan et al, 2013).…”

Section: R Bell and Othersmentioning

confidence: 99%

Nonlinear Effects of Nanoparticles: Biological Variability from Hormetic Doses, Small Particle Sizes, and Dynamic Adaptive Interactions

2013

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Researchers are increasingly focused on the nanoscale level of organization where biological processes take place in living systems. Nanoparticles (NPs, e.g., 1-100 nm diameter) are small forms of natural or manufactured source material whose properties differ markedly from those of the respective bulk forms of the "same" material. Certain NPs have diagnostic and therapeutic uses; some NPs exhibit low-dose toxicity; other NPs show ability to stimulate low-dose adaptive responses (hormesis). Beyond dose, size, shape, and surface charge variations of NPs evoke nonlinear responses in complex adaptive systems. NPs acquire unique size-dependent biological, chemical, thermal, optical, electromagnetic, and atom-like quantum properties. Nanoparticles exhibit high surface adsorptive capacity for other substances, enhanced bioavailability, and ability to cross otherwise impermeable cell membranes including the blood-brain barrier. With super-potent effects, nano-forms can evoke cellular stress responses or therapeutic effects not only at lower doses than their bulk forms, but also for longer periods of time. Interactions of initial effects and compensatory systemic responses can alter the impact of NPs over time. Taken together, the data suggest the need to downshift the dose-response curve of NPs from that for bulk forms in order to identify the necessarily decreased no-observed-adverse-effect-level and hormetic dose range for nanoparticles.

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“…78 of different sizes and shapes with different surface areas in various solvents. 79 These nanotechnology processes are respectively analogous to homeopathic manual trituration in dry lactose or succussions in liquid solutions. 79,81,86 One nanotechnology group found that combining milling with ultrasound agitation of the solutions was most effective for creating and dispersing the resultant NPs compared with either method by itself.…”

Section: Figure 2 Top Down and Bottom Up Manufacturing Strategies Formentioning

confidence: 99%

Enhancement of adaptive biological effects by nanotechnology preparation methods in homeopathic medicines

Bell

Schwartz

2015

Homeopathy

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Multiple studies have demonstrated that traditional homeopathic manufacturing reagents and processes can generate remedy source and silica nanoparticles (NPs). Homeopathically-made NPs would initiate adaptive changes in an organism as a complex adaptive system (CAS) or network. Adaptive changes would emerge from several different endogenous amplification processes that respond to exogenous danger or threat signals that manufactured nanomaterials convey, including (1) stochastic resonance (SR) in sensory neural systems and (2) time-dependent sensitization (TDS)/oscillation. SR is nonlinear coherent amplification of a weak signal by the superposition of a larger magnitude white noise containing within it the same frequencies of the weak signal. TDS is progressive response magnitude amplification and oscillatory reversal in response direction to a given low dose at physiological limits with the passage of time. Hormesis is an overarching adaptive phenomenon that reflects the observed nonlinear adaptive dose-response relationship. Remedies would act as enhanced micro- and nanoscale forms of their source material via direct local ligand-receptor interactions at very low potencies and/or by triggering systemic adaptive network dynamical effects via their NP-based electromagnetic, optical, and quantum mechanical properties at higher potencies. Manufacturing parameters including dilution modify sizes, shapes, and surface charges of nanoparticles, thereby causing differences in physico-chemical properties and biological effects. Based on surface area, size, shape, and charge, nanoparticles adsorb a complex pattern of serum proteins, forming a protein corona on contact that constitutes a unique biological identity. The protein corona may capture individualized dysfunctional biological mediator information of the organism onto the surfaces of the salient, i.e., resonant, remedy nanostructures. SR would amplify this weak signal from the salient remedy NPs with protein corona adsorbed, leading to sensitized nonlinear dynamical modulation of gene expression and associated changes in biological signaling pathways. When the system reaches its physiological limits during a homeopathic aggravation or the natural disease state, the amplified remedy signal triggers a nonlinear reversal in dynamical direction back towards health.

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Sonochemical effect on size reduction of CaCO3 nanoparticles derived from waste eggshells

Cited by 77 publications

References 47 publications

Eggshell reinforced biocomposite—An advanced “green” alternative structural material

Eggshell reinforced biocomposite—An advanced “green” alternative structural material

Nonlinear Effects of Nanoparticles: Biological Variability from Hormetic Doses, Small Particle Sizes, and Dynamic Adaptive Interactions

Enhancement of adaptive biological effects by nanotechnology preparation methods in homeopathic medicines

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