Sucrose clusters exhibiting a magic number in dilute aqueous solutions

Area of Science:

• Physical Chemistry
• Solution Chemistry
• Molecular Dynamics

Background:

• Sucrose solutions are common in biological and industrial applications.
• Understanding molecular clustering in solution is crucial for predicting solution behavior.
• Previous studies have not fully elucidated the aggregation state of sucrose in dilute aqueous solutions.

Purpose of the Study:

• To investigate the presence and characteristics of sucrose molecule clusters in dilute aqueous solutions.
• To identify any unique or unusually abundant cluster structures.
• To correlate cluster properties with solution conditions.

Main Methods:

• Electrospraying of dilute aqueous sucrose solutions to generate airborne charged clusters.
• Measurement of the electrical mobility spectrum of these airborne clusters.
• Analysis of spectral peaks to infer cluster size, structure, and abundance.

Main Results:

• Observed a distinct "magic" peak in the electrical mobility spectrum, indicating a more compact cluster structure.
• This "magic" peak was significantly more prominent in basic solutions compared to acidic ones.
• The overall spectrum suggested the presence of various sucrose cluster sizes in the solution prior to electrospraying.

Conclusions:

• The findings provide evidence for pre-existing sucrose clusters of multiple sizes in dilute aqueous solutions.
• The "magic" cluster's prominence in basic solutions suggests pH-dependent clustering mechanisms.
• A simplified model successfully reproduced the experimental observations, supporting the clustering hypothesis.