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Direct Probing of Dispersion Quality of ZrO2 Nanoparticles Coated by Polyelectrolyte at Different Concentrated Suspensions.

Sarraf H, Qian Z, Škarpová L, Wang B, Herbig R, Maryška M, Bartovska L, Havrda J, Anvari B - Nanoscale Res Lett (2015)

Bottom Line: It is found that an optimum amount of 1.4 mass% dispersant at the inherent pH (>9.2) can be attached fully onto the nanoparticles with sufficient electrosteric dispersion effects, suitable for casting applications.Supplementary scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HR-TEM) analyses followed by colorization effect were taken to verify the visible interaction between dispersant and nanoparticles surfaces.This study will be of interest to materials scientists and engineers who are dealing with dispersion technology, nanoparticle surface treatments, functionalization, characterization, and application of bio/nanoparticle suspensions at various concentrations using different types of polymers.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing, 210016, China. hsarraf@wgu.edu.

ABSTRACT
This study reports useful application of the electrokinetic sonic amplitude (ESA) technique in combination with rheometry and electron microscopy techniques for direct probing the stability of low and high-concentrated zirconia (ZrO2) nanosuspensions in the presence of an alkali-free anionic polyelectrolyte dispersant Dolapix CE64. A comparative study of the electrokinetic characteristics and the rheological behavior of concentrated ZrO2 nanosuspensions has been done. Good agreement was obtained from relationship between the electrokinetic characteristics (zeta potential, ESA signal), viscosity, and its pH dependence for each concentrated ZrO2 nanosuspension with different dispersant concentration in the range of 0.9-1.5 mass%. A nanoscale colloidal hypothesis is proposed to illustrate that the addition of different amounts of dispersant influences on both the stability and the electrokinetic and rheological properties of concentrated ZrO2 nanosuspensions. It is found that an optimum amount of 1.4 mass% dispersant at the inherent pH (>9.2) can be attached fully onto the nanoparticles with sufficient electrosteric dispersion effects, suitable for casting applications. Supplementary scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HR-TEM) analyses followed by colorization effect were taken to verify the visible interaction between dispersant and nanoparticles surfaces. SEM and HR-TEM images proved the existence of visible coverage of dispersant on the surface of individual nanoparticles and showed that thin polyelectrolyte layers were physically bound onto the particles' surfaces. This study will be of interest to materials scientists and engineers who are dealing with dispersion technology, nanoparticle surface treatments, functionalization, characterization, and application of bio/nanoparticle suspensions at various concentrations using different types of polymers.

No MeSH data available.


Related in: MedlinePlus

An orthographic display of predicted 3-D molecular structure of alkali-free anionic polymer, Dolapix CE64
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Fig2: An orthographic display of predicted 3-D molecular structure of alkali-free anionic polymer, Dolapix CE64

Mentions: A new type of electrosteric dispersant, Dolapix CE64 (Zschimmer & Schwarz GmbH Co., Germany), was used in this study as a dispersing agent. Table 1 introduces several physical characteristics of Dolapix CE64 that are provided by the manufacturer. The manufacturer does not give further information about this dispersant. A predicted orthographic display of the 3-D molecular structure (simulated by using materials studio, Accelrys) of this dispersant is illustrated in Fig. 2. In this study, dispersant concentration is expressed in mass% on dry powder basis. Solids loading is expressed in both mass% and volume%.Table 1


Direct Probing of Dispersion Quality of ZrO2 Nanoparticles Coated by Polyelectrolyte at Different Concentrated Suspensions.

Sarraf H, Qian Z, Škarpová L, Wang B, Herbig R, Maryška M, Bartovska L, Havrda J, Anvari B - Nanoscale Res Lett (2015)

An orthographic display of predicted 3-D molecular structure of alkali-free anionic polymer, Dolapix CE64
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4666182&req=5

Fig2: An orthographic display of predicted 3-D molecular structure of alkali-free anionic polymer, Dolapix CE64
Mentions: A new type of electrosteric dispersant, Dolapix CE64 (Zschimmer & Schwarz GmbH Co., Germany), was used in this study as a dispersing agent. Table 1 introduces several physical characteristics of Dolapix CE64 that are provided by the manufacturer. The manufacturer does not give further information about this dispersant. A predicted orthographic display of the 3-D molecular structure (simulated by using materials studio, Accelrys) of this dispersant is illustrated in Fig. 2. In this study, dispersant concentration is expressed in mass% on dry powder basis. Solids loading is expressed in both mass% and volume%.Table 1

Bottom Line: It is found that an optimum amount of 1.4 mass% dispersant at the inherent pH (>9.2) can be attached fully onto the nanoparticles with sufficient electrosteric dispersion effects, suitable for casting applications.Supplementary scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HR-TEM) analyses followed by colorization effect were taken to verify the visible interaction between dispersant and nanoparticles surfaces.This study will be of interest to materials scientists and engineers who are dealing with dispersion technology, nanoparticle surface treatments, functionalization, characterization, and application of bio/nanoparticle suspensions at various concentrations using different types of polymers.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing, 210016, China. hsarraf@wgu.edu.

ABSTRACT
This study reports useful application of the electrokinetic sonic amplitude (ESA) technique in combination with rheometry and electron microscopy techniques for direct probing the stability of low and high-concentrated zirconia (ZrO2) nanosuspensions in the presence of an alkali-free anionic polyelectrolyte dispersant Dolapix CE64. A comparative study of the electrokinetic characteristics and the rheological behavior of concentrated ZrO2 nanosuspensions has been done. Good agreement was obtained from relationship between the electrokinetic characteristics (zeta potential, ESA signal), viscosity, and its pH dependence for each concentrated ZrO2 nanosuspension with different dispersant concentration in the range of 0.9-1.5 mass%. A nanoscale colloidal hypothesis is proposed to illustrate that the addition of different amounts of dispersant influences on both the stability and the electrokinetic and rheological properties of concentrated ZrO2 nanosuspensions. It is found that an optimum amount of 1.4 mass% dispersant at the inherent pH (>9.2) can be attached fully onto the nanoparticles with sufficient electrosteric dispersion effects, suitable for casting applications. Supplementary scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HR-TEM) analyses followed by colorization effect were taken to verify the visible interaction between dispersant and nanoparticles surfaces. SEM and HR-TEM images proved the existence of visible coverage of dispersant on the surface of individual nanoparticles and showed that thin polyelectrolyte layers were physically bound onto the particles' surfaces. This study will be of interest to materials scientists and engineers who are dealing with dispersion technology, nanoparticle surface treatments, functionalization, characterization, and application of bio/nanoparticle suspensions at various concentrations using different types of polymers.

No MeSH data available.


Related in: MedlinePlus