Multi-Radiation Shielding Materials Using Functionalized Boron Nitride and Bismuth Halide Composite
- Alternative Title
- 표면개질된 질화붕소와 비스무트 할라이드 복합체를 이용한 다중 방사선 차폐 소재
- Abstract
- The burgeoning space industry demands innovative materials for robust radiation protection. This study presents a novel lightweight, flexible composite for comprehensive shielding against X-rays, protons, and secondary neutrons. Enhanced dispersion of pyridine-functionalized boron nitride nanosheets (Py-BNNs) within a polydimethylsiloxane (PDMS) matrix significantly improved radiation attenuation and thermal stability. Optimized with bismuth iodide (BiI3), the Py-BNN/PDMS/BiI3 composite exhibited superior linear (4.258 cm⁻¹) and mass attenuation (3.451 cm²/g) coefficients, with reduced half-value and tenth-value layers. Proton irradiation tests confirmed that the well-dispersed Py-BNNs effectively scattered proton beams, resulting in enhanced particle radiation shielding performance. This lightweight, flexible, and multi-radiation shielding composite offers a promising and sustainable solution for safeguarding human health and electronic systems in space.
Keywords: surface functionalization, multi-radiation shielding, boron nitride nanosheets, composites, attenuation efficiency
- Issued Date
- 2025
- Awarded Date
- 2025-08
- Type
- Dissertation
- Publisher
- 국립부경대학교 대학원
- Alternative Author(s)
- Kim hyeon Kwang
- Affiliation
- 국립부경대학교 대학원
- Department
- 대학원 신소재시스템공학과
- Advisor
- Junghwan Kim
- Table Of Contents
- Chapter 1. Introduction 1
1.1. Principles of radiation and shielding mechanisms 1
1.1.1. ionizing radiation types: X-ray, Proton, Neutron 2
1.1.1.1. X-ray radiation (electromagnetic) 3
1.1.1.2. Proton radiation (charged particle) 4
1.1.1.3. Neutron radiation (neutral particle) 5
1.2. Strategy for Py-BNNs/BiI3/PDMS-based composites materials 8
1.2.1. Pyridine-functionalized boron nitride nanosheets(BNNs) 8
1.2.1. Bismuth triiodide (BiI3) as a high-Z filler 9
1.2.1. Polydimethylsiloxane (PDMS) as a polymer matrix 10
1.3. Recent research for multi-radiation shielding 10
Chapter 2. Experiments 12
2.1. Materials 12
2.2. Synthesis of BNN and Py-BNN 12
2.3. Fabrication of Py-BNN/PDMS sponge with BiI3 adsorption 13
2.4. Characterization 15
Chapter 3. Results and Discussion 16
3.1. Pyridine-achored BNN powder 16
3.1.1. BET 16
3.1.2. SEM and EDS analysis 18
3.1.3. XRD 21
3.1.4. FT-IR 23
3.1.5. TEM 25
3.1.6. XPS 27
3.1.7. Dispersion stability evaluation 29
3.2. Py-BNN/PDMS/BiI3 composites 33
3.2.1. SEM and EDS analysis 33
3.2.2. Thermal properties analysis 39
3.3. Radiation shielding performance of Py-BNN/PDMS/BiI3 composites 43
3.3.1. X-ray shielding performance 43
3.3.2. Proton shielding performance 48
Chapter 4. Conclusion 52
References 53
Abstract (Korean) 75
- Degree
- Master
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