TAILIEUCHUNG - Thermodynamics Interaction Studies Solids, Liquids and Gases 2011 Part 4

Tham khảo tài liệu 'thermodynamics interaction studies solids, liquids and gases 2011 part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 140 Thermodynamics - Interaction Studies - Solids Liquids and Gases confining the plume at the focal point of the ellipsoidal cell further nanoparticle formation experiments were carried out. Figure 12 is a schematic diagram of the apparatus with an ellipsoidal cell. The laser spot is intentionally shilled by a distance . from the central axis of the ellipsoidal cell while the target surface is also intentionally inclined by an angle 0 against a plane perpendicular to the central axis. Figure 13 shows some of the results for nanoparticles produced as a result of changing these parameters. The experimental results shown in Figure 13 a which are obtained under the conditions . mm and 0 represent monodispersed nanoparticles when the target surface has no inclination but the laser spot is shifted . 2 Target Plume Discahrgmg Direction Fig. 12. Schematic of experiment demonstrating the importance of confinement Fig. 13. Influence of shock wave confinement on deposited nanoparticles morphology in the ellipsoidal cell field of view 200x200nm Thermodynamics of Nanoparticle Formation in Laser Ablation 141 mm as shown in Figure 13 b some aggregation is observed. The result in Figure 13 c where . mm and 0 shows the appearance of fine nanoparticles similar to the normal case Figure 13 a . The mainly small and uniformly sized nanoparticles shown in Figure 13 d formed under conditions of . mm and 0 . In contrast when . 2 mm 0 secondary particles were generated by nanoparticle aggregation Figure 13 e . Although the position of the laser spot is shifted and also the density of laser energy is slightly changed Figures 13 c and 13 d relative to the normal case Figure 13 a the sizes of the resulting nanoparticles were found to be finely dispersed similar to the normal case. The confinement effect of the plume by the converging shock wave plays a role in these cases because the plume ejection is approximately directed to the focal point of the ellipsoidal .

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