Delsa Nano Zeta Potential and
Submicron Particle Size Analyzer
Applications of Carbon
Nanotubes (CNT) in Electronics
Solubilization of Carbon Nanotubes (CNT)
Particle Size and
Zeta Potential Measurement of Multiwalled Carbon Nanotubes (MWCNT)
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Spanning the biomedical testing continuum - from pioneering medical research and
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Delsa Nano Zeta Potential and Submicron Particle Size Analyzer
The DelsaNano series is a new generation of instruments that use
photon correlation spectroscopy (PCS), which determines particle size by
measuring the rate of fluctuations in laser light intensity scattered by
particles as they diffuse through a fluid, for size analysis measurements and/or
electrophoretic light scattering (ELS), which determines electrophoretic
movement of charged particles under an applied electric field from the Doppler
shift of scattered light, for zeta potential determination.
This series has a broad range of capabilities, including conventional static
and automatic titration measurements for both size and zeta potential
distributions of suspended particles in a wide range of size and concentration.
The DelsaNano also can measure zeta potential of a solid surface
Applications of Carbon Nanotubes (CNT) in Electronics
nanotubes (CNT) were discovered in 1991. Many attempts have been made to
create devices based on CNT properties, such as electronic state and layered,
cylindrical structure. Lately, various CNT
applications (e.g., gas sensors, lithium ion batteries, bio-related products)
have been proposed.
Characterizing the Solubilization of Carbon Nanotubes (CNT)
Considerable research on CNT
applications is underway in the fields of electronics, physical properties, and
physics. On the other hand, however, research has lagged in the fields of
chemistry, biochemistry, medical science, and pharmaceutical science. The reason
is that CNT is solubilized in neither water nor organic solvents. To
date, solubilization has been attempted with various methods, and methods based
on chemical bonding, physical adsorption, etc., have been reported. In this
study, a CNT sample was dispersed with a surfactant.
Particle Size and Zeta Potential Measurement of Multiwalled Carbon Nanotubes
size and zeta potential were measured before and after the addition of
surfactant. The CNT sample used was a multiwalled
CNT from Aldrich with an outside diameter of 20-30 nm, an inside diameter of
1-2 nm, and a length of 0.5-2 ìm. Suspensions were prepared so as to yield a
particle concentration of 1 mg/ml in distilled water and in 1% aqueous solution
of SDS, respectively. After one hour of ultrasonic dispersion, particle size and
zeta potential were measured by using the DelsaNano
C, a zeta potential and submicron particle size
analyzer. The particle
size distributions are shown in Figure 1 and the zeta potential
distributions are shown in Figure 2. It is evident that, by adding SDS, the
absolute value of the zeta potential is increased, and conversely the particle
diameter is decreased, thereby yielding a better dispersed or solubilized
Figure 1. Zeta potential distributions.
Figure 2. Particle size distributions.
Source: Beckman Coulter
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