TITLE:
A Comparative Study of Force Measurements in Solution Using Micron and Nano Size Probe
AUTHORS:
Diganta Dutta, Roman Schmidt, Samodha C. Fernando, Indrani Ghosh Dastider
KEYWORDS:
Atomic Force Microscopy, Surface Charge Density, Electrical Double Layer Force and Van der Waals Force
JOURNAL NAME:
World Journal of Nano Science and Engineering,
Vol.9 No.1,
March
29,
2019
ABSTRACT: Atomic force microscopy (AFM) is a device that is
used for not only high-resolution imaging but
also used for measuring forces. It is possible to quantify the surface density change for both colloid and nano probe as well as silica surface. By changing the quantity of ions within
a potassium chloride solution, it then becomes possible to evaluate the
quantity of ions that attach themselves to AFM colloid probe, nano probe and silica samples. In this study, the force was measured between AFM probes and silica surface in different
ionic concentrations. Two different types of AFM probe were used: a colloid
probe with a radius of 500 nano-meters and a nano probe with a radius of 10 nano-meters. This study is focused on measuring how the force magnitude, especially electrical
double layer force, varied between the two
types of probes by changing ionic concentrations. For all test trials, the results
agreed with the electrical double layer theory. Although the micron probe was
almost an exact match for all ranges, the nano probe was closest within its short-range forces. This is attributed to
the formula use when analyzing the electrical double layer force. Because the
formula was originally calculated for the micron probe, the shape and size of
the nano probe created too many variables for an exact match. Along with
quantifying the forces, this experiment allowed for an observation of Van der
Waals force making it possible to calculate the Hamaker constant. Conclusively,
all results show that the obtained surface charge density increases as the
ionic concentration increases. In addition, through the comparison of the
results obtained from the nano-sized probe and the micron-sized probe, it was concluded that nano size probe mapped higher surface
charge density above the silica surface than the micron-sized probe under the same conditions.