Unilateral NMR with a barrel magnet

Area of Science:

• Analytical Chemistry
• Physical Chemistry
• Spectroscopy

Background:

• Unilateral Nuclear Magnetic Resonance (NMR) offers advantages in sample size flexibility, portability, and cost-effectiveness.
• Existing unilateral NMR systems face challenges in performance for sample regions remote from the apparatus.

Purpose of the Study:

• To develop a unilateral NMR system with enhanced performance in a remote sample region.
• To improve the sensitivity and applicability of portable NMR devices.

Main Methods:

• Creation of a magnetic field saddle point where second derivatives of the main field component are nulled.
• Utilized a magnet (∼10cm diameter, ∼5cm thick) and a surface gradiometer coil.
• Detected signals from a sensitive region extending ∼2cm from the magnet.

Main Results:

• Successfully developed a unilateral NMR setup with improved performance.
• The system demonstrated a sensitive region approximately 2cm from the magnet.
• The relatively homogeneous field enabled measurement of rapidly diffusing spins and use of smaller RF amplifiers.

Conclusions:

• The developed unilateral NMR system enhances performance in remote sample regions.
• This advancement facilitates the development of more mobile and inexpensive NMR instruments.
• The technology supports the measurement of rapidly diffusing spins, broadening NMR applications.