Tertiary grain growth driven by surface energy

Jung, Jung-Kyu; Park, Young-Joon; Hwang, Nong‐Moon; Joo, Young‐Chang

doi:10.1016/s1359-6462(01)01017-x

Cited by 6 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The surface energy on the (000l) planes is higher in comparison with other planes. 10,15 For ZrB 2 , the low activation energy diffusion path is along <210> and <110> directions. 10 Therefore, the ZrB 2 grains grow very well along a-or b-axis.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Plate‐LikeZrB₂Grains

Zou

Huang

et al. 2011

J. Am. Ceram. Soc.

View full text Add to dashboard Cite

Plate‐like ZrB2 grains were synthesized at 1550°C by in situ solid/liquid reaction using Zr and B powders mixed with transition metal (Mo, Nb, Ti, or W) and Si powder. The preferred growth direction of plate grains was along a‐ or b‐axis depending on the initial content of transition metal and silicon in the mixtures. The synthesis mechanism of plate‐like grain was possibly related to the catalysis of in situ formed silicides.

show abstract

Section: Resultsmentioning

confidence: 99%

Synthesis of Plate‐LikeZrB₂Grains

Zou

Huang

et al. 2011

J. Am. Ceram. Soc.

View full text Add to dashboard Cite

show abstract

“…This suggests that thermal treatment causes the conglomeration of NPs and NRs to minimize the surface energy, leading to the growth of nanometer-sized materials. [14] This event causes a decrease in the actual specific surface area, reducing the amount of dye molecules adsorbed on the titanium dioxide surface. Brunauer-Emmett-Teller (BET) measurement was performed to understand the 3D distribution of NPs and NRs in the thin film structure and determine the specific surface area, porosity, and surface roughness factor.…”

mentioning

confidence: 99%

Nanorod‐Based Dye‐Sensitized Solar Cells with Improved Charge Collection Efficiency

et al. 2007

View full text Add to dashboard Cite

“…From some literature, this phenomenon where crystal growth is initiated from the sample edge is likely attributed to the free surface energy. Jung et al (2001) reported that the both the grain boundaries and surface energy also play a very important role in determining grain growth. In the same report, they commented that the free surface energy will only play an active role in driving grain growth when the grain size is comparable to the film thickness.…”

Section: In Situ Tem Analysis Of Fs Laser Irradiated Titaniummentioning

confidence: 99%

Femtosecond laser interaction with fused silica in surface structuring

Tan¹

View full text Add to dashboard Cite

The need for miniaturisation in devices in today's industries has led to a vast array of micromachining processes. Yet, micromachining of glass remains a great challenge due to the extreme brittleness and hardness of the material. With the development of the chirped pulse amplification (CPA) technique in the mid-1980s, powerful femtosecond (10-15 s) laser systems are now readily available in the market for carrying out micromachining on various materials. Femtosecond (fs) lasers have several advantages over their long pulse laser counterparts. First, the high intensity of femtosecond laser pulse will easily triggers the multiphoton absorption process to occur in transparent material enabling bulk modification within the transparent materials. Moreover, the ultrashort pulse duration (~100 fs) of a femtosecond laser enables energy to be dissipated before thermal diffusion occurs (~10 ps), thus collateral damages around the machined area is minimized. These unique properties have opened up new opportunities in using femtosecond lasers for carrying out micromachining and micro fabrication of glass and other transparent materials. Despite the ongoing work to study femtosecond laser-material interaction, practical use of femtosecond laser for industrial application can be still considered at the development stage as the beam interaction process is not well understood. New physical mechanism and phenomenon can arise when the machining is performed using different materials and conditions. Therefore, in this research, a femtosecond laser was used to carry ablation of transparent material in air using fused silica as a model optical material. The objective of this research is to gain a better understanding on the femtosecond laser irradiation effects on fused silica so that it can be applied to practical micromachining processes. These effects include ripple formation, change in crystal structures and surface morphologies as well as how the laser irradiated Abstract ii machined profiles respond to various laser parameters. Special attention was paid to characterize the laser irradiated morphologies and structures as well as studying phenomenon related to micromachining of fused silica. Major results and new findings are summarized as follows: Femtosecond laser induced periodic structures on fused silica were systematically studied by irradiating the surface using a wide range of laser processing parameters. It is found that two directional ripples having periods smaller than the laser wavelength can be formed on the surface of fused silica. It is demonstrated that the the origin of the coarse ripple is related to the ultrafast melting and solidification of fused silica and the fine ripple is a result of harmonica wave generation. It is also found that orientation and period of these ripple structures can be controlled experimentally by varying the beam polarization. It is further observed that the influence of the surface defect like scratches exert an even stronger influence on the ripple orientation than the beam polari...

show abstract

Tertiary grain growth driven by surface energy

Cited by 6 publications

References 6 publications

Synthesis of Plate‐LikeZrB₂Grains

Synthesis of Plate‐LikeZrB₂Grains

Nanorod‐Based Dye‐Sensitized Solar Cells with Improved Charge Collection Efficiency

Femtosecond laser interaction with fused silica in surface structuring

Contact Info

Product

Resources

About

Tertiary grain growth driven by surface energy

Cited by 6 publications

References 6 publications

Synthesis of Plate‐LikeZrB2Grains

Synthesis of Plate‐LikeZrB2Grains

Nanorod‐Based Dye‐Sensitized Solar Cells with Improved Charge Collection Efficiency

Femtosecond laser interaction with fused silica in surface structuring

Contact Info

Product

Resources

About

Synthesis of Plate‐LikeZrB₂Grains

Synthesis of Plate‐LikeZrB₂Grains