Characterization of rheological properties of colloidal zirconia

Jachimska, Barbara; Adamczyk, Zbǐgniew

doi:10.1016/j.jeurceramsoc.2006.07.013

Cited by 19 publications

(11 citation statements)

References 18 publications

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“…It is also vital to understand any changes to proteins natural characteristics to any future attempts to improve the fluorescence properties of the fluorophore complex. In this work we applied, electrophoretic mobility 23 , QCM-D 24 , UV-Vis, density, viscosity 25 and Circular Dichroism (CD) measurement techniques to characterise the physicochemical properties of Lysozyme and Ly-AuNCs under different pH conditions in order to better understand how AuNC nucleation affects Lysozyme's natural state.…”

Section: Introductionmentioning

confidence: 99%

Lysozyme encapsulated gold nanoclusters: effects of cluster synthesis on natural protein characteristics

Russell

Jachimska

Komorek

et al. 2017

Phys. Chem. Chem. Phys.

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The study of gold nanoclusters (AuNCs) has seen much interest in recent history due to their unique fluorescence properties and environmentally friendly synthesis method using proteins as a growth scaffold. The differences in the physicochemical properties of lysozyme encapsulated AuNCs in comparison to natural lysozyme are characterised in order to determine the effects AuNCs have on natural protein behaviour. The hydrodynamic radius (dynamic light scattering), light absorbance (UV-Vis), electrophoretic mobility, relative density, dynamic viscosity, adsorption (quartz crystal microbalance) and circular dichroism (CD) characteristics of the molecules were studied. It was found that lysozyme forms small dimer/trimer aggregates upon the synthesis of AuNCs within the protein. The diameter of Ly-AuNCs was found to be 8.0 nm across a pH range of 2-11 indicating dimer formation, but larger aggregates with diameters >20 nm were formed between pH 3 and 6. The formation of larger aggregates limits the use of Ly-AuNCs as a fluorescent probe in this pH range. A large shift in the protein's isoelectric point was also observed, shifting from 11.0 to 4.0 upon AuNC synthesis. This resulted in major changes to the adsorption characteristics of lysozyme, observed using a QCM. A monolayer of 8 nm was seen for Ly-AuNCs at pH 4, offering further evidence that the proteins form small aggregates, unlike the natural monomer form of lysozyme. The adsorption of Ly-AuNCs was seen to decrease as pH was increased; this is in major contrast to the lysozyme adsorption behaviour. A decrease in the α-helix content was observed from 25% in natural lysozyme to 1% in Ly-AuNCs. This coincided with an increase in the β-sheet content after AuNC synthesis indicating that the natural structure of lysozyme was lost. The formation of protein dimers, the change in the protein surface charge from positive to negative, and secondary structure alteration caused by the AuNC synthesis must be considered before attempting to utilise Ly-AuNCs as in vivo probes.

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Section: Introductionmentioning

confidence: 99%

Lysozyme encapsulated gold nanoclusters: effects of cluster synthesis on natural protein characteristics

Russell

Jachimska

Komorek

et al. 2017

Phys. Chem. Chem. Phys.

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“…For instance, great quality and high reliability of ferrites in solid state as well as the production of complex geometrical shape having a defect-free microstructure after sintering, requires the use of homogeneous semi-solid dispersions composed of considerably stable and welldispersed particles [7]. Furthermore, particle size is known to be crucial a factor in particular applications such as drug delivery, at where dimensions below 1 mm are required not only to avoid the obstruction of the capillaries, but also to favor the diffusion of particles into the organism while they are injected into the biological environment [8,9].…”

Section: Introductionmentioning

confidence: 99%

Modulation of size and viscosity of Ni/Zn ferrites: Effect of doping with βCD and chemical treatment with HNO3 and NaOH

Corrêa

Abrishamkar

Silva

et al. 2015

Journal of Molecular Structure

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“…(2). This negative charge layers prevent particles to agglomerate and a stable colloidal suspension can be obtained [12][13][14] Zr…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Monodisperse Hydrous Colloidal Zirconia Nanoparticles

Nguyen

Nguyen²,

Tham

et al. 2020

Comm. in Phys.

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The suspension of hydrous colloidal zirconia particles (CZPs) was prepared from zirconium oxychloride solutions via thermal hydrolysis at acidic condition and at boiling point of 110 ºC for 72 h. Characterization of the obtained suspension and dried solid ZrO2 was performed by DLS, FESEM, FTIR, XRD and TGA measurements. Purification via dialysis membrane can maintain the monodispersion of the colloidal suspension when stabilized at pH6. The suspension contained almost sheet-like colloidal particles with amorphous structure with size ranges from 70 to 140 nm in wide and about 40-60 nm in thickness. The formula of hydrous CZPs can be expressed as ZrO2.2H2O.

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Characterization of rheological properties of colloidal zirconia

Cited by 19 publications

References 18 publications

Lysozyme encapsulated gold nanoclusters: effects of cluster synthesis on natural protein characteristics

Lysozyme encapsulated gold nanoclusters: effects of cluster synthesis on natural protein characteristics

Modulation of size and viscosity of Ni/Zn ferrites: Effect of doping with βCD and chemical treatment with HNO3 and NaOH

Synthesis and Characterization of Monodisperse Hydrous Colloidal Zirconia Nanoparticles

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