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Sheng, X., Wang, J., Cheng, Y. & Zhao, Z. (2021). Controllable Fabrication of Large-Size Defect-Free Domains of 2D Colloidal Crystal Masks Guided by Statistical Experimental Design. Coatings, 11(1), Article ID 82.
Open this publication in new window or tab >>Controllable Fabrication of Large-Size Defect-Free Domains of 2D Colloidal Crystal Masks Guided by Statistical Experimental Design
2021 (English)In: Coatings, ISSN 2079-6412, Vol. 11, no 1, article id 82Article in journal (Refereed) Published
Abstract [en]

Large defect-free domains of a hexagonal packed monolayer of silica spheres with the size of 4000 mu m(2) were successfully prepared by dual-speed spin coating. Experimental design and statistical analysis instead of the traditional 'changing one separate factor at a time' (COST) approach were employed to guide the implementation of the experiments. With its assistance, the hexagonal-close-packed (HCP) percentage was elevated to 84% in this study. Furthermore, almost all the samples with parameters in the selected ranges possessed more than a 60% HCP percentage. In addition, the optimal values for parameters of the suspension concentration, the first rotation speed, and the spinning time to obtain well-ordered silica spheres arrays were also identified as 30 wt.%, 1000 rpm and 20 s, respectively.

Place, publisher, year, edition, pages
MDPI, 2021
Keywords
monolayer colloidal crystals, defect-free domain size, experimental design, spin coating
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-289917 (URN)10.3390/coatings11010082 (DOI)000610005900001 ()2-s2.0-85099834908 (Scopus ID)
Note

QC 20210212

Available from: 2021-02-12 Created: 2021-02-12 Last updated: 2022-06-25Bibliographically approved
Shen, M., Zhao, W., Xing, B., Sing, Y., Gao, S., Wang, C. & Zhao, Z. (2020). Effects of exposure time and printing angle on the curing characteristics and flexural strength of ceramic samples fabricated via digital light processing. Ceramics International, 46(15), 24379-24384
Open this publication in new window or tab >>Effects of exposure time and printing angle on the curing characteristics and flexural strength of ceramic samples fabricated via digital light processing
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2020 (English)In: Ceramics International, ISSN 0272-8842, E-ISSN 1873-3956, Vol. 46, no 15, p. 24379-24384Article in journal (Refereed) Published
Abstract [en]

The development of photosensitive slurries for additive manufacturing has attracted great interest due to their correlation with the final properties of the fabricated parts. This paper focus on the printing quality control in digital light processing (DLP) 3D printing of advanced ceramics. Systematic experiments were performed to assess the effects of the exposure time and printing angle on the three-point bending strength of the fabricated samples. The exposure time affected the bending strength of the printed zirconia ceramic dramatically. When the weak exposure time is 1 s and the strong exposure time is 13 s, the average bending strength can reach 580 MPa while Weibull modulus can reach 8.84. Meanwhile, the printing angle also affected the bending strength mechanical sample printed at 45 degrees exhibits the worst performance.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Exposure time, Print angle, DLP, Zirconia
National Category
Dentistry
Identifiers
urn:nbn:se:kth:diva-281500 (URN)10.1016/j.ceramint.2020.06.220 (DOI)000564524900002 ()2-s2.0-85086947946 (Scopus ID)
Note

QC 20201021

Available from: 2020-10-21 Created: 2020-10-21 Last updated: 2022-06-25Bibliographically approved
Zhao, W., Wang, C., Xing, B., Shen, M. & Zhao, Z. (2020). Mechanical properties of zirconia octet truss structures fabricated by DLP 3D printing. Materials Research Express, 7(8), Article ID 085201.
Open this publication in new window or tab >>Mechanical properties of zirconia octet truss structures fabricated by DLP 3D printing
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2020 (English)In: Materials Research Express, E-ISSN 2053-1591, Vol. 7, no 8, article id 085201Article in journal (Refereed) Published
Abstract [en]

Zirconia ceramic octet-truss structures with various strut size and unit cell numbers were successfully fabricated through a DLP-based 3D printing method. The mechanical properties and energy absorption capacity under compressive load were investigated systematically. The sides of all cubes are 10 mm, the strut size was changed from 0.25 mm to 2 mm, cells number was in the range of 1(1 x 1 x 1)-125(5 x 5 x 5). It has been seen that the relative density, compressive strength and energy absorption increases with the increase of strut size when cell numbers remain the same. It can be concluded that the strength and energy absorption were affected by the relative density, strut size and the stacking mode of the unit cells. So far, with this study, a high compressive strength of 75.3 MPa and a reasonably good energy absorption of 6.76 x 10(5)J m(-3)can be achieved at a relative density of 48.57%.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD, 2020
Keywords
octet-truss structure, 3D printing, compressive loading, energy absorption capacity, zirconia ceramic
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-280217 (URN)10.1088/2053-1591/aba643 (DOI)000560699700001 ()2-s2.0-85091751183 (Scopus ID)
Note

QC 20201126

Available from: 2020-11-26 Created: 2020-11-26 Last updated: 2022-06-25Bibliographically approved
Sheng, X., Cheng, Y., Yao, Y. & Zhao, Z. (2020). Optimization of Synthesizing Upright ZnO Rod Arrays with Large Diameters through Response Surface Methodology. Processes, 8(6), Article ID 655.
Open this publication in new window or tab >>Optimization of Synthesizing Upright ZnO Rod Arrays with Large Diameters through Response Surface Methodology
2020 (English)In: Processes, ISSN 2227-9717, Vol. 8, no 6, article id 655Article in journal (Refereed) Published
Abstract [en]

The deposition parameters involved in chemical bath deposition were optimized by a response surface methodology to synthesize upright ZnO rod arrays with large diameters. The effects of the factors on the preferential orientation, aspect ratio, and diameter were determined systematically and efficiently. The results demonstrated that an increased concentration, elevated reaction temperature, prolonged reaction time, and reduced molar ratio of Zn(2+)to tri-sodium citrate could increase the diameter and promote the preferential oriented growth along the [002] direction. With the optimized parameters, the ZnO rods were grown almost perfectly vertically with the texture coefficient of 99.62. In the meanwhile, the largest diameter could reach 1.77 mu m. The obtained rods were merged together on this condition, and a dense ZnO thin film was formed.

Place, publisher, year, edition, pages
MDPI, 2020
Keywords
tri-sodium citrate, ZnO rod arrays, response surface methodology
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-279210 (URN)10.3390/pr8060655 (DOI)000553613400001 ()2-s2.0-85087507246 (Scopus ID)
Note

QC 20200818

Available from: 2020-08-18 Created: 2020-08-18 Last updated: 2022-06-26Bibliographically approved
Zhao, W., Wang, C. & Zhao, Z. (2019). Bending Strength of 3D-Printed Zirconia Ceramic Cellular Structures. In: IOP Conference Series: Materials Science and Engineering. Institute of Physics Publishing (1)
Open this publication in new window or tab >>Bending Strength of 3D-Printed Zirconia Ceramic Cellular Structures
2019 (English)In: IOP Conference Series: Materials Science and Engineering, Institute of Physics Publishing , 2019, no 1Conference paper, Published paper (Refereed)
Abstract [en]

Cellular structure has been applied in lightweight engineering application because of its high specific strength, high modulus and low relative density. Here we used 3Y-TZP ceramic to realize two typical cellular structures, Kelvin and Octet-truss, through a novel digital light processing (DLP) 3D printing method. The strut size was changed systematically to generate structures with porosities in the range of 10% ∼ 80% and the bending strength of these structures were investigated and analyzed by three-point bending test. 

Place, publisher, year, edition, pages
Institute of Physics Publishing, 2019
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-272332 (URN)10.1088/1757-899X/678/1/012019 (DOI)2-s2.0-85078231176 (Scopus ID)
Note

QC 20200427

Available from: 2020-04-27 Created: 2020-04-27 Last updated: 2022-06-26Bibliographically approved
Dong, H., Zhao, Z. & Wang, C. (2019). Effect of powder characteristics on the thermal conductivity and mechanical properties of Si 3 N 4 ceramics sintered by Spark plasma sintering. Journal of materials science. Materials in electronics, 30(8), 7590-7599
Open this publication in new window or tab >>Effect of powder characteristics on the thermal conductivity and mechanical properties of Si 3 N 4 ceramics sintered by Spark plasma sintering
2019 (English)In: Journal of materials science. Materials in electronics, ISSN 0957-4522, E-ISSN 1573-482X, Vol. 30, no 8, p. 7590-7599Article in journal (Refereed) Published
Abstract [en]

The effect of powder characteristics on the thermal conductivity and mechanical properties of silicon nitride (Si 3 N 4 ) ceramics were investigated systematically by using two α-Si 3 N 4 powders as raw materials and using MgSiN 2 or MgO + Y 2 O 3 as sintering additives. The Si 3 N 4 ceramics with a higher density were obtained by α-Si 3 N 4 powders with lower oxygen content and impurities and using none-oxide sintering additive MgSiN 2 . The α–β phase transformation completely taken place in all the specimen at 1750 °C. The specimens sintered by powders with lower levels of oxygen and impurities show higher mechanical properties than other specimens. The Y 2 O 3 and MgO sintering additives lead to higher flexural strength and fracture toughness than MgSiN 2 . The Vickers’ hardness is just the opposite. The thermal conductivity value of powders with lower oxygen content is higher than that of the materials prepared by the other type of powder at the same conditions. The effects of the Si 3 N 4 particle size, native oxygen and impurities on the thermal conductivity of resultant materials were discussed in detail. This work demonstrates that the improvement in thermal conductivity of Si 3 N 4 can be obtained by using none-oxide sintering additive MgSiN 2 and the Si 3 N 4 powder with lower oxygen content, and impurities.

Place, publisher, year, edition, pages
Springer-Verlag New York, 2019
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-251829 (URN)10.1007/s10854-019-01074-w (DOI)000467637200041 ()2-s2.0-85064720981 (Scopus ID)
Note

QC 20190523

Available from: 2019-05-23 Created: 2019-05-23 Last updated: 2022-06-26Bibliographically approved
Yao, Y., Sha, N. & Zhao, Z. (2019). Highly Concentrated Hydroxyapatite Suspension for DLP Printing. In: IOP Conference Series: Materials Science and Engineering. Paper presented at The 11th International Conference on High-Performance Ceramics 25–29 May 2019, Kunming, China. Institute of Physics Publishing (1)
Open this publication in new window or tab >>Highly Concentrated Hydroxyapatite Suspension for DLP Printing
2019 (English)In: IOP Conference Series: Materials Science and Engineering, Institute of Physics Publishing , 2019, no 1Conference paper, Published paper (Refereed)
Abstract [en]

Due to the lack of commercially available high-quality hydroxyapatite (HA) powder, it is still rarely reported by the literature concerning the development of UV resin for digital light processing 3D printing. The previous studies still had the problem of delamination and also poor sintering performance led by low solid-load slurry. Here low viscosity and high solid-load hydroxyapatite (HA) UV resin suspensions were developed for digital light processing 3D printing. In this study, the effect of the type of dispersant, the dose levels of dispersant and the solid load of HA powder on the rheology properties were thoroughly investigated to obtain a flowable highly-concentrated HA UV resin suspension. Finally, a 40vol% slurry with viscosity of 3.7Pa•s at a shear rate of 10 s-1 was successfully developed. After 3D printing and sintering, a dense ceramic with relative density of 95.85% can be obtained at a sintering temperature of 1300°C.

Place, publisher, year, edition, pages
Institute of Physics Publishing, 2019
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-272330 (URN)10.1088/1757-899X/678/1/012016 (DOI)2-s2.0-85078277819 (Scopus ID)
Conference
The 11th International Conference on High-Performance Ceramics 25–29 May 2019, Kunming, China
Note

QC 20200513

Available from: 2020-05-13 Created: 2020-05-13 Last updated: 2022-06-26Bibliographically approved
Zheng, D., Wei, G., Xu, L., Guo, Q., Hu, J., Sha, N. & Zhao, Z. (2019). LaNi x Fe 1- x O 3 (0 ≤ x ≤1) as photothermal catalysts for hydrocarbon fuels production from CO 2 and H 2 O. Journal of Photochemistry and Photobiology A: Chemistry, 377, 182-189
Open this publication in new window or tab >>LaNi x Fe 1- x O 3 (0 ≤ x ≤1) as photothermal catalysts for hydrocarbon fuels production from CO 2 and H 2 O
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2019 (English)In: Journal of Photochemistry and Photobiology A: Chemistry, ISSN 1010-6030, E-ISSN 1873-2666, Vol. 377, p. 182-189Article in journal (Refereed) Published
Abstract [en]

LaNi x Fe 1- x O 3 perovskite compounds (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) were successfully synthesized by a sol-gel combustion method. The crystal structure, morphology, BET surface area, oxygen vacancies, band gap and catalytic properties of the catalyst were characterized in detail. The results showed that LaNi 0.4 Fe 0.6 O 3 compound exhibits the best photothermal catalytic performance. Under the same catalytic conditions (350 ℃ + Vis-light), CH 4 and CH 3 OH yields are about 3.5 and 4.0 times, 1.8 and 2.1 times of that of LaFeO 3 and LaNiO 3 . It was found that all the solid solutions possesses better catalytic properties than the pure end compounds. The doping of Ni lead to a significant modification with the quantity of oxygen vacancies and band gaps. These findings may further broaden the materials scope for photothermal conversion of CO 2 and H 2 O.

Place, publisher, year, edition, pages
Elsevier B.V., 2019
Keywords
CO 2 reduction, LaFeO 3, LaNiO 3, Photothermal catalysis
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-252527 (URN)10.1016/j.jphotochem.2019.03.045 (DOI)000468714500021 ()2-s2.0-85063933526 (Scopus ID)
Note

QC 20190610

Available from: 2019-06-10 Created: 2019-06-10 Last updated: 2024-01-10Bibliographically approved
Gao, S., Wang, C. & Zhao, Z. (2019). Mechanical Properties of ZrO2 Honeycomb Sandwich Structures by 3D Printing. In: IOP Conference Series: Materials Science and Engineering. Institute of Physics Publishing (1)
Open this publication in new window or tab >>Mechanical Properties of ZrO2 Honeycomb Sandwich Structures by 3D Printing
2019 (English)In: IOP Conference Series: Materials Science and Engineering, Institute of Physics Publishing , 2019, no 1Conference paper, Published paper (Refereed)
Abstract [en]

Honeycomb sandwich structures were widely used in lightweight design. However, the difficulties with the fabrication process actually highly limit their practical usage, especially for ceramic materials. In this paper, 3 mol% yttria-stabilized ZrO2 (3Y-TZP) honeycomb sandwich structures with square and hexagonal cell were prepared successfully by using digital light processing (DLP) printing method. With a base material density of >6.02g/cm3, square/hexagonal honeycomb sandwich structures with structural density of 42.89%-66.24% were achieved by modifying unit cell wall thickness. It can be concluded that square honeycomb cell is preferred for getting higher bending strength at the same structural density. 

Place, publisher, year, edition, pages
Institute of Physics Publishing, 2019
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-272331 (URN)10.1088/1757-899X/678/1/012018 (DOI)2-s2.0-85078233371 (Scopus ID)
Note

QC 20200427

Available from: 2020-04-27 Created: 2020-04-27 Last updated: 2022-06-26Bibliographically approved
Shen, M., Wang, C. & Zhao, Z. (2019). Mechanical Properties of ZrO2 TPMS Structures Prepared by DLP 3D Printing. In: IOP Conference Series: Materials Science and Engineering. Paper presented at The 11th International Conference on High-Performance Ceramics 25–29 May 2019, Kunming, China. Institute of Physics Publishing (1)
Open this publication in new window or tab >>Mechanical Properties of ZrO2 TPMS Structures Prepared by DLP 3D Printing
2019 (English)In: IOP Conference Series: Materials Science and Engineering, Institute of Physics Publishing , 2019, no 1Conference paper, Published paper (Refereed)
Abstract [en]

Compressive strength is one of the most important mechanical properties for cellular ceramics. But the dependence of compressive strength of highly porous cellular ceramic structures on porosity remains unclear due to the limit of available methods for making such strong structures based on specific structural designs. In this paper, the TPMS structures, namely P-cell, and neovius structure, were prepared based on the DLP 3D printing technology. Samples with various unit cells were fabricated with zirconia. The relative density of the sintered samples exceeds 99%. The effects of cell number on the compressive strength and deformation of the model were investigated. Samples with similar relative densities exhibited comparable mechanical property in aspect of compressive strength. It is very interesting that the cell number eventually only influence the total strain.

Place, publisher, year, edition, pages
Institute of Physics Publishing, 2019
National Category
Dentistry
Identifiers
urn:nbn:se:kth:diva-272329 (URN)10.1088/1757-899X/678/1/012017 (DOI)2-s2.0-85078299054 (Scopus ID)
Conference
The 11th International Conference on High-Performance Ceramics 25–29 May 2019, Kunming, China
Note

QC 20200513

Available from: 2020-05-13 Created: 2020-05-13 Last updated: 2022-06-26Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-3060-9987

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