Title

Production of Samarium Nanoparticles by Gamma Irradiation

Presenter Information

Samuel Murphy

Department

Nuclear Engineering and Radiation Science

Major

Nuclear Engineering

Research Advisor

Castano, Carlos H.

Advisor's Department

Nuclear Engineering and Radiation Science

Funding Source

Nuclear Regulatory Commission grant NRC-38-10-966; Mining and Nuclear Engineering Department

Abstract

Samarium nanoparticles were created in a solution of water and isopropyl alcohol using an intense radiation source. A cobalt-60 source irradiated samples containing Sm3+ ions with a 10 kGy/hr dose rate. Radicals formed reduced the Sm3+ ions to neutral atoms. These coalesced into spherical clusters. A polymer surfactant called polyvinylpyrrolidone (PVP) was added to regulate nanoparticle growth.

Nanoparticles were observed on a scanning transmission electron microscope. Using a solution irradiated to 40 kGy consisting of 0.15 mM PVP and 0.10 mM Sm3+, the average diameter was 201.9 nm, the mode was 149.3 nm, and the standard deviation was 83.7. 230 particles were observed and particles smaller than 50 nm were not included. Energy-dispersive X-ray spectroscopy confirmed the particles were samarium.

Solutions of nanoparticles that had received radiation doses ranging from 10 kGy to 40 kGy were measured. Higher doses produce smaller, spherical particles. Lower doses produce larger, jagged particles.

Biography

Samuel is a senior at Missouri S&T majoring in Nuclear Engineering. He graduates in December 2012.

Research Category

Engineering

Presentation Type

Poster Presentation

Document Type

Poster

Location

Upper Atrium/Hallway

Presentation Date

10 Apr 2012, 1:00 pm - 3:00 pm

Comments

Joint project with James Weeks and Robert Zedric

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Apr 10th, 1:00 PM Apr 10th, 3:00 PM

Production of Samarium Nanoparticles by Gamma Irradiation

Upper Atrium/Hallway

Samarium nanoparticles were created in a solution of water and isopropyl alcohol using an intense radiation source. A cobalt-60 source irradiated samples containing Sm3+ ions with a 10 kGy/hr dose rate. Radicals formed reduced the Sm3+ ions to neutral atoms. These coalesced into spherical clusters. A polymer surfactant called polyvinylpyrrolidone (PVP) was added to regulate nanoparticle growth.

Nanoparticles were observed on a scanning transmission electron microscope. Using a solution irradiated to 40 kGy consisting of 0.15 mM PVP and 0.10 mM Sm3+, the average diameter was 201.9 nm, the mode was 149.3 nm, and the standard deviation was 83.7. 230 particles were observed and particles smaller than 50 nm were not included. Energy-dispersive X-ray spectroscopy confirmed the particles were samarium.

Solutions of nanoparticles that had received radiation doses ranging from 10 kGy to 40 kGy were measured. Higher doses produce smaller, spherical particles. Lower doses produce larger, jagged particles.