3-D printed Electron Paramagnetic Resonance sample holder
Author:Earl Smith Jr.
Mentor:Timothy Usher, Professor, California State University, San Bernardino
A constant bottleneck in a laboratory environment is the need for new tools or methods to progress. This often means that something needs to be bought, or designed—however, by usage of a 3-D printer; this process is made more streamlined. Electron paramagnetic resonance (EPR) is a way to detect the presence of an unpaired electron, an effective way of probing matter. The spectrometer shines microwave energy onto a sample that is held in a magnetic field to determine the gyroscopic ratio (g-factor). Generally the g-factor is represented by a 3x3 matrix (g-tensor). In a crystalline sample the elements of the matrix can be determined by rotating the sample about three perpendicular axes. By usage of 3-D modeling software and a 3-D printer, we were able to design and print sample tubes tailored specifically for the mapping of g-tensors within an EPR cavity. To confirm our methods, we used one of the global standards for EPR, diphenyl picrylhydrazl (DPPH) in crystalline form. Our experimental results are 2.00036, 2.00040, and 2.00038, all falling in line, within experimental error, with very recently published results.