Synthesis and characterization of hydrothermally grown potassium titanate nanowires

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Date

2015

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Hanyang University

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Metallurgical and Materials Engineering
(2004)
The main fields of operation for Metallurgical and Materials Engineering are production of engineering materials, defining and improving their features, as well as developing new materials to meet the expectations at every aspect of life and the users from these aspects. Founded in 2004 and graduated its 10th-semester alumni in 2018, our Department also obtained MÜDEK accreditation in the latter year. Offering the opportunity to hold an internationally valid diploma through the accreditation in question, our Department has highly qualified and experienced Academic Staff. Many of the courses offered at our Department are supported with various practice sessions, and internship studies in summer. This way, we help our students become better-equipped engineers for their future professional lives. With the Cooperative Education curriculum that entered into effect in 2019, students may volunteer to work at contracted companies for a period of six months with no extensions to their period of study.
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English Translation and Interpretation
(2001)
Since 2001, our Department has offered education at an extent that matches the similar Departments of European Universities, with a program that involves theoretical and practical courses within the frameworks of translation and interpretation. The goals that we aim our students to reach involve the utilization of knowledge, behaviors and equipment, interpersonal operation in interpretation, the management of the process of production, expertise in language skills with respect to fields and general culture, and access to information. Our students have no difficulty in being hired upon graduation, having gained an awareness regarding the expectations and the conditions of the professional life through our strong cooperation with the national and the international sector. With French and Russian courses offered for 4 years, our students steal the spotlight in the market, having obtained a C-Language Certificate. Our graduates are employed as freelance interpreters, institution interpreters, regulators as multi-layered language experts, terminology experts, subtitle experts and web localization experts.

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Abstract

Potassium titanate (KT) nanowires were synthesized by a one-step hydrothermal reaction between TiO2 and aqueous KOH solution. The effects of KOH concentration and reaction time on hydrothermal formation and KT nanowire growth were investigated. The nanowire growth mechanism was elucidated using a combined study of powder X-ray diffraction, and scanning and transmission electron microscopy. The results revealed that hydrothermal growth was initiated by the formation of amorphous-like Ti-O-K sheets in anatase. Increasing hydrothermal reaction time caused the transformation of anatase to Ti-O-K sheets, from which potassium hexa-titanate (K2Ti6O13) nuclei formed and grew to establish one-dimensional morphology through preferential growth along the b-axis. It was revealed that the hydrothermal reactions followed a quite different mechanism than the well-known calcination route. Potassium tetra-titanate (K2Ti4O9) crystals formed in the amorphous region using the hexa-titanate phase as a nucleation site for heterogeneous crystallization. Increasing the KOH concentration in the solution accelerated the hydrothermal reaction rate. © 2015, Hanyang University. All rights reserved.

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Keywords

High-resolution transmittance electron microscopy (HRTEM), Hydrothermal, Potassium titanate

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Citation

8

WoS Q

Q3

Scopus Q

Q3

Source

Journal of Ceramic Processing Research

Volume

16

Issue

3

Start Page

291

End Page

297

URI

https://hdl.handle.net/20.500.14411/9423

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Scopus