Jongee Park

Park, Jongee

Profile URL

https://hdl.handle.net/20.500.14411/6649

Name Variants

Jongee Park
P.,Jongee
P., Jongee
J.,Park
Park J.
Park, Jongee
Park,J.
J., Park
Park,Jongee
Jongee, Park
Park, J

Job Title

Profesör Doktor

Email Address

jongee.park@atilim.edu.tr

Main Affiliation

Metallurgical and Materials Engineering

Sustainable Development Goals

14

LIFE BELOW WATER

0

Research Products

2

ZERO HUNGER

0

Research Products

11

SUSTAINABLE CITIES AND COMMUNITIES

1

Research Products

1

NO POVERTY

0

Research Products

12

RESPONSIBLE CONSUMPTION AND PRODUCTION

0

Research Products

7

AFFORDABLE AND CLEAN ENERGY

12

Research Products

5

GENDER EQUALITY

0

Research Products

3

GOOD HEALTH AND WELL-BEING

2

Research Products

9

INDUSTRY, INNOVATION AND INFRASTRUCTURE

0

Research Products

13

CLIMATE ACTION

0

Research Products

6

CLEAN WATER AND SANITATION

0

Research Products

10

REDUCED INEQUALITIES

0

Research Products

4

QUALITY EDUCATION

0

Research Products

15

LIFE ON LAND

0

Research Products

16

PEACE, JUSTICE AND STRONG INSTITUTIONS

0

Research Products

17

PARTNERSHIPS FOR THE GOALS

0

Research Products

8

DECENT WORK AND ECONOMIC GROWTH

0

Research Products

Documents

53

Citations

927

h-index

19

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Documents

50

Citations

890

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Scholarly Output

57

Articles

45

Views / Downloads

21/0

Supervised MSc Theses

3

Supervised PhD Theses

0

WoS Citation Count

819

Scopus Citation Count

855

WoS h-index

19

Scopus h-index

19

Patents

0

Projects

1

WoS Citations per Publication

14.37

Scopus Citations per Publication

15.00

Open Access Source

7

Supervised Theses

3

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Journal	Count
Ceramics International	10
Journal of Nanoscience and Nanotechnology	3
Applied Surface Science	2
3rd International Conference on NANOCON -- SEP 21-23, 2011 -- Brno, CZECH REPUBLIC	2
Advanced Materials Research -- 2012 International Conference on Advances in Materials Science and Engineering, AMSE 2012 -- 9 December 2012 through 10 December 2012 -- Seoul -- 95488	2

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Now showing 1 - 10 of 35

Citation - WoS: 32
Citation - Scopus: 28
Photocatalytic activity of hydroxyapatite-precipitated potassium titanate whiskers
(Elsevier Science Sa, 2010) Park, Jongee
Photocatalytic properties of hydroxyapatite (HAP)-precipitated multifunctional potassium titanate (KT) whiskers were investigated in terms of the decomposition of methylene blue (MB) in aqueous solution under UV irradiation. Hydroxyapatite was formed on the surface of KT whiskers through a biomimetic process in simulated body fluid (SBF). The SBF used in this investigation had concentrations of calcium and phosphate ions 10 times greater than those of human plasma. Results revealed that hydroxyapatite precipitation enhanced the photocatalytic activity of the KT whiskers. In the case of unreacted KT whisker, complete degradation of methylene blue took 5.5 h, on the other hand degradation time decreased to 3.5 h when the whisker was precipitated with hydroxyapatite. (C) 2009 Elsevier B.V. All rights reserved.
Citation - WoS: 12
Citation - Scopus: 11
Enhanced Bioactivity and Low Temperature Degradation Resistance of Yttria Stabilized Zirconia/Clay Composites for Dental Applications
(Elsevier Sci Ltd, 2022) Tufan, Yigithan; Park, Jongee; Ozturk, Abdullah; Ercan, Batur
Yttria stabilized zirconia (YSZ)/clay composites were produced to improve osseointegration and undesired tetragonal-to-monoclinic phase transformation (low temperature degradation, LTD) of YSZ ceramics so that long-term clinical success of YSZ implants is achieved. Various amounts (0.5,1,2, and 4 wt%) of clay was incorporated to YSZ. Predetermined amounts of clay and YSZ were mixed and pressed uniaxially at 15 MPa into compacts that were subsequently pressureless sintered at 1450 degrees C. Density, compressive strength, hardness and indentation crack resistance of 4 wt% clay incorporated YSZ/clay composite were 5.77 +/- 0.01 g/cm3, 1188 +/- 121 MPa, 1223 +/- 9 HV, and 4.4 +/- 0.1 MPa root m, respectively. Additionally, biological properties of YSZ/clay composites were assessed in vitro using bone cells. Incorporation of 4 wt% clay significantly enhanced bone cell prolifer-ation, spreading, and functions. Moreover, a significant increase in the LTD resistance of YSZ was achieved upon 4 wt% clay incorporation. The findings collectively suggest that YSZ/clay composites have a potential to be used as an alternative material for dental applications.
Citation - WoS: 11
Citation - Scopus: 10
Synthesis and Characterization of Hydrothermally Grown Potassium Titanate Nanowires
(Korean Assoc Crystal Growth, inc, 2015) Kapusuz, Derya; Kalay, Y. Eren; Park, Jongee; Ozturk, Abdullah; Metallurgical and Materials Engineering
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.
Citation - WoS: 10
Alkaline Hydrothermal Synthesis, Characterization, and Photocatalytic Activity of Tio₂ Nanostructures: the Effect of Initial Tio₂ Phase
(Amer Scientific Publishers, 2019) Erdogan, Nursev; Park, Jongee; Choi, Woohyuk; Kim, Soo Young; Ozturk, Abdullah
One-dimensional (1D) titanate nanostructures were synthesized by hydrothermal route, using commercially available TiO2 (P25) and anatase powders as precursor materials and strong NaOH solution as catalyzer. The prepared titanates were calcined, followed by protonation to produce TiO2 nanostructures having enhanced photocatalytic and photovoltaic properties. The synthesized TiO2 1D nanostructures were characterized using field-emission scanning electron microscope, high-resolution electron microscope, X-ray diffraction analysis, and UV-Vis photospectroscopy to understand the effect of initial TiO2 phase on morphological and crystallographic features, and bandgap. Methylene blue degradation test was applied to evaluate the photoactivity of the products obtained after different stages of the process. The findings indicate that 1D TiO2 nanostructures form by different mechanisms from dissolved aggregates during hydrothermal process, depending on the crystal structure of the initial precursor used. Photocatalytic test results reveal that protonated titanates have considerable adsorption capability, while photocatalytic degradation depends on TiO2 transformation.
Citation - WoS: 25
Citation - Scopus: 26
Identifying the Potentials for Charge Transport Layers Free N-P Homojunction-Based Perovskite Solar Cells
(Pergamon-elsevier Science Ltd, 2022) Khan, Danish; Sajid, Sajid; Khan, Suliman; Park, Jongee; Ullah, Ihsan
Perovskite solar cells (PSCs) with no charge transport layers (CTLs) could be one of the major device architectures for the production of simple and low-cost devices. However, CTLs-free PSCs based on n-p homojunction have yet to show high power conversion efficiency (PCE), which is most likely due to inadequate light-and charge-management in the p-type perovskite. The device operation is examined using Solar Cell Capacitance Simulator (SCAPS)-software, and a novel n-p homojunction design is proposed to attempt efficient CTLs-free PSCs. Several aspects of p-type layer that can affect device performance, such as acceptor density, photon harvesting capability, defects density, and resistances to the transport of charge-carriers are scrutinized and adjusted. Furthermore, the effects of different work-functions of metal electrodes are examined. A suitable acceptor concentration is required for oriented charge transport. It is determined that a p-type perovskite with a thickness of 0.3 mu m is advantageous for high performance. A metal electrode with a high work-function is essential for efficient device. Consequently, a PCE of 15.60% is obtained with an optimal defect density of E15 cm(-3), indicating that n-p homojunction-based CTLs-free PSCs are promising since they simplify the device design and fabrication process while retaining an acceptable PCE.
Citation - WoS: 31
Citation - Scopus: 37
Effect of Initial Water Content and Calcination Temperature on Photocatalytic Properties of Tio₂ Nanopowders Synthesized by the Sol-Gel Process
(Elsevier Sci Ltd, 2015) Agartan, Lutfi; Kapusuz, Derya; Park, Jongee; Ozturk, Abdullah
The effects of initial water content and calcination temperature on sol gel synthesized TiO2 powders were studied. Mother solutions had water/Ti-precursor mole ratios (R ratio) of 1, 5, 10, and 50. Dried aerogels were calcined for 3 h at temperatures of 300, 400, and 500 degrees C to obtain crystallized TiO2 nanopowders in the range of 15-30 nm. PE-scanning electron microscopy and X-ray diffraction techniques were employed to investigate the morphological and structural properties of the nanopowders synthesized. Profound effect of gel viscosity was observed on the formation mechanism and extent of crystallinity in the powders. Methylene blue degradation test results suggest, photocatalytic performance is enhanced as initial water content and calcination temperature increased. Band-gap energy of the powders ranged from 3.09 to 3.27 eV. Overall, this study shows that initial water content and calcination regime have a profound effect on the phase assembly, crystallite size, band-gap energy, and photocatalytic performance of sol gel synthesized TiO2 nanopowders. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
Citation - WoS: 2
Citation - Scopus: 4
Influence of Boron And/Or Zirconium Doping on Morphology and Optical Properties of Titania
(Tanger Ltd, 2011) Kapusuz, Derya; Park, Jongee; Ozturk, Abdullah; Metallurgical and Materials Engineering
Sol-gel derived B (boron) and Zr (zirconium) doped TiO2 (Titania) nanoparticles were synthesized. Microstructural, photocatalytic and crystallographic properties of the doped particles were investigated. Highest photocatalytic activity was achieved by 10 wt% Zr doping. 5 wt% doping was the optimum value for effective B doping. B ions were found to form oxygen vacancies behaving as interstitial defects whereas Zr ions substituted Ti4+ ions in the lattice.
Citation - WoS: 57
Citation - Scopus: 68
Mechanical Properties of B₄c-sic Composites Fabricated by Hot-Press Sintering
(Elsevier Sci Ltd, 2020) So, Sung Min; Choi, Woo Hyuk; Kim, Kyoung Hun; Park, Joo Seok; Kim, Min Suk; Park, Jongee; Kim, Hyung Sun
We fabricated boron carbide-silicon carbide (B4C-SiC) composites by hot-press sintering without additives and evaluated the crystal phase, relative density, microstructure, and mechanical properties of the sintered body. When B4C and SiC were uniformly dispersed in the composite, crystal growth was inhibited, and a sintered body with a fine and uniform microstructure, with improved mechanical properties, was fabricated. The relative density of B4C-SiC composites sintered at temperatures lower than 2000 degrees C and 40 MPa of pressure exceeded 99.8%, and the bending strength and Vickers hardness at B4C 50 wt% were 645 MPa and 30.6 GPa, respectively.
Citation - WoS: 25
Citation - Scopus: 26
Production and Properties of Tooth-Colored Yttria Stabilized Zirconia Ceramics for Dental Applications
(Elsevier Sci Ltd, 2018) Kaplan, Melis; Park, Jongee; Kim, Soo Young; Ozturk, Abdullah
Dense zirconia stabilized with 3 mol% yttria ceramics were produced in disc shape by first cold isostatically pressing at 100 MPa and then sintering at 1450 degrees C at ambient laboratory conditions. Coloring was accomplished by immersion the discs in NiCl2, MoCl3, and NiCl2 + MoCl3 solutions for 5, 30, and 60 s. Different concentrations (0.1, 0.25, and 0.5 wt%) were applied to get the color of natural tooth. The density, color, microhardness, fracture toughness, compressive strength, and wear rate of the discs were measured to evaluate the suitability of the colored discs for dental applications. Color assessments were made by measuring CIE Lab L*, a*, b, and Delta E* values. Low temperature degradation of the samples was evaluated by aging sensitivity tests in autoclave for 2, 4, and 6 h. Results have shown that color produced depends on the kind and concentration of the colorant solution while time of immersion has no significant effect on coloring process. Coloring solutions containing 0.1 and 0.25 wt% MoCl3 provided clinically acceptable color with the Delta E* value ranging from 5.16 to 6.42 for dental applications.
Citation - WoS: 29
Citation - Scopus: 29
A Newly Constructed Photoactive System, Fe(iii)-c/N-bi_{2< for Efficient Visible Light Photocatalysis}
(Elsevier Science Sa, 2018) Sudrajat, Hanggara; Park, Jongee; Hartuti, Sri; Park, Jongee; Park, Jongee; Metallurgical and Materials Engineering; Metallurgical and Materials Engineering
In this study, two strategies are simultaneously applied for photocatalytic activity enhancement of Bi2O3. The first strategy is to increase the light absorption via simultaneous carbon and nitrogen doping. The second strategy is to increase the charge carrier separation via Fe grafting. Transmission electron microscopy observation reveals the presence of Fe nanoclusters resided on the Bi2O3 surface. Near edge Xray absorption fine structure (NEXAFS) analysis confirms the valence state of the Fe species to be +3, and their coordination to be octahedral. The C K-edge and N K-edge NEXAFS spectra furthermore confirm the incorporation of C and N species in the Bi2O3 structure. This newly constructed photocatalyst, denoted as Fe(III)-C/N-Bi2O3, shows appreciably enhanced photocatalytic performance for the decomposition of 2,4-dichlorophenol under visible light as compared to bare Bi2O3. (C) 2018 Elsevier B.V. All rights reserved.

Park, Jongee

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Sustainable Development Goals

14

LIFE BELOW WATER

0

Research Products

2

ZERO HUNGER

0

Research Products

11

SUSTAINABLE CITIES AND COMMUNITIES

1

Research Products

1

NO POVERTY

0

Research Products

12

RESPONSIBLE CONSUMPTION AND PRODUCTION

0

Research Products

7

AFFORDABLE AND CLEAN ENERGY

12

Research Products

5

GENDER EQUALITY

0

Research Products

3

GOOD HEALTH AND WELL-BEING

2

Research Products

9

INDUSTRY, INNOVATION AND INFRASTRUCTURE

0

Research Products

13

CLIMATE ACTION

0

Research Products

6

CLEAN WATER AND SANITATION

0

Research Products

10

REDUCED INEQUALITIES

0

Research Products

4

QUALITY EDUCATION

0

Research Products

15

LIFE ON LAND

0

Research Products

16

PEACE, JUSTICE AND STRONG INSTITUTIONS

0

Research Products

17

PARTNERSHIPS FOR THE GOALS

0

Research Products

8

DECENT WORK AND ECONOMIC GROWTH