05 pd100

KSV PD 100
Interfacial Elasticity
– Pulsating Drop Module

• Stability of emulsions and foams
• Adsorption and competition of
surfactants, proteins or
polymers at interfaces
• Rheological characteristics
of interfaces
• Controlled compression
or dilation of an area of
an interface (sinusoidal,
ramp, step, saw tooth)
• Wide frequency range
of perturbation
• Small liquid volume

KSV PD 100 is an optional module for the KSV’s
CAM 200 Surface tension/Contact angle meter.
The module enables determination of rheological
characteristics of interfacial layers.
The viscoelasticity of an interface is measured by
inducing a small controlled perturbation to a pendant
drop (or bubble) volume and simultaneously recording
the response of the interfacial tension and the drop
area. If the interfacial deformation is sinusoidal the
interfacial elasticity and viscosity can easily be
determined from the phase shift of the interfacial
tension and area response.

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KSV PD 100
Example Measurements

Area and surface tension response to
a sinusoidal volume perturbation.

Elasticity as a function of frequency for PEO polymer.

Specifications
Perturbation principle:
Perturbation form:
Frequency range:
Frequency resolution:
Maximum volume amplitude:
Volume amplitude resolution:
Sample liquid volume needed:
Sensor head dimension:
Operational voltage:
Computer requirements:

www.ksvltd.com

Piezo-electric membrane enclosed in a chamber
Sinusoidal, saw tooth, square or ramp
0-100 Hz (practically useful range 0.01 – 10 Hz)
0.001 Hz
4 µl

0.01µl
0.6 ml
150 x 120 x 20 mm3
12 V DC adapter (90-264 V , 50/60 Hz)
PC running Windows™ 2000 or XP, sound card

KSV Instruments Ltd.
Höyläämötie 7
00380 Helsinki
FINLAND

Tel. +358-9-5497-3300
Fax +358-9-5497-3333
e-mail: