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25. Optimization of a TEOS addition on plasma resistance of YAG ceramics.

Author

Zhao, Cheng‐Cai, Kim, Eun‐Bi, Park, Young‐Jo, Logesh, Govindasamy, Kim, Mi‐Ju, Lee, Jae‐Wook, Ma, Ho Jin, Kim, Ha‐Neul, Ko, Jae‐Woong, and Yoon, Seog‐Young

Abstract

The influence of tetraethyl orthosilicate (TEOS) on the plasma etching behavior of yttrium aluminum garnet (Y3Al5O12, yttrium aluminum garnet [YAG]) was systematically studied. Dense YAG bulk specimens were hot‐press sintered at a relatively low temperature of 1450°C for 2 h under 20 MPa, using TEOS as a sintering additive. The etching properties of YAG ceramics, doped with different TEOS contents, were evaluated using an inductively coupled plasma etcher with an incident plasma power of 1500 W for up to 2 h. It was observed that the addition of.3 wt.% TEOS optimally reduced the surface roughness of YAG ceramics post‐plasma etching. Transmission electron microscopy and X‐ray fluorescence tests clarified that a densification‐promoting TEOS‐induced residual Si‐rich phase at the triple junction for the over‐doped TEOS (≥.5 wt.%) specimen acts as a pit‐initiation site during plasma etching, which eventually results in increased surface roughness. [ABSTRACT FROM AUTHOR]

Published
2024
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28. Programmed Death 1 and Cytotoxic T-Lymphocyte-Associated Protein 4 Gene Expression in Peripheral Blood Mononuclear Cells Can Serve as Prognostic Biomarkers for Hepatocellular Carcinoma

Author

Lee, Ji Ah, primary, Choi, Hei-Gwon, additional, Eun, Hyuk Soo, additional, Bu, Jiyoon, additional, Jang, Tae Min, additional, Lee, Jeongdong, additional, Son, Chae Yeon, additional, Kim, Min Seok, additional, Rou, Woo Sun, additional, Kim, Seok Hyun, additional, Lee, Byung Seok, additional, Kim, Ha Neul, additional, Lee, Tae Hee, additional, and Jeon, Hong Jae, additional

Published
2024
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33. Compatibilization of immiscible blends of polypropylene and isosorbide containing copolyester with silica nanoparticles

Author

Kim, Ha Neul, Park, Chang Kyu, Kim, Ick Soo, and Kim, Seong Hun

Subjects
Silicon dioxide, Polypropylene, Nanoparticles, Polyols, Isosorbide dinitrate, Engineering and manufacturing industries, Science and technology
Abstract

In the present study, Compatibilization of immiscible blends of polymers was investigated based on the Pickering emulsion concept with various mixing procedures. Silica nanoparticles were incorporated into poly (1,4-cyclohexanedimethylene isosorbide terephthalate) (PEICT)/isotactic polypropylene (iPP) blends. Localization of nanoparticles was effectively modified by varying mixing procedures. Relocation of hydrophilic silica occurred in a secondary mixing procedure with the PEICT, which has relatively high affinity when primarily mixed with iPP. The final location of the silica nanoparticles was confirmed by SEM images. SEM and an optical microscope were used to follow morphological change. By simply changing the mixing procedure, the hydrophilic silica nanoparticles were able to perform the role of a morphology modifier successfully without modifying the surface characteristics. The mechanical properties and crystallization behavior were also compared depending on the surface characteristics of the silica nanoparticles and their final localization. KEYWORDS blends, poly(propylene) (PP), polyesters, silicas, 1 | INTRODUCTION Since the synthesis of polymers with new structures requires considerable investment in terms of time and cost, polymer blending is an important strategy for realizing novel or [...]

Published
2020
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