scholarly journals Millisecond photonic sintering of iron oxide doped alumina ceramic coatings

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Evgeniia Gilshtein ◽  
Stefan Pfeiffer ◽  
Marta D. Rossell ◽  
Jordi Sastre ◽  
Lovro Gorjan ◽  
...  
Keyword(s):  
Visible Light ◽  
Diffusion Processes ◽  
Ceramic Coatings ◽  
Flash Lamp ◽  
Heating Rates ◽  
Light Pulses ◽  
Visible Light Range ◽  
Alumina Particles ◽  
Refractory Ceramics ◽  
Photonic Sintering

AbstractThe sintering of alumina (Al2O3) traditionally occurs at high temperatures (up to ca. 1700 °C) and in significantly long times (up to several hours), which are required for the consolidation of the material by diffusion processes. Here we investigate the photonic sintering of alumina particles using millisecond flash lamp irradiation with extreme heating rates up to 108 K/min. The limitation of the low visible light absorption of alumina is resolved by adding colored α-Fe2O3 nanoparticles, which initiated the grain growth during sintering. After the millisecond-long light pulses from a xenon flash lamp, a bimodal mixture of α-Al2O3 precursor particles was sintered and iron segregation at the grain boundaries was observed. The proposed photonic sintering approach based on doping with colored centers may be extended to other refractory ceramics with low absorption in the visible light range once appropriate high-absorbing dopants are identified.

Theoretical insight into the CdS/FAPbI3 heterostructure: a promising visible-light absorber

2021 ◽  
Author(s):  
Junli Chang ◽  
Liping Jiang ◽  
Guangzhao Wang ◽  
Yuhong Huang ◽  
Hong Chen
Keyword(s):  
Optical Absorption ◽  
Visible Light ◽  
Visible Light Range ◽  
Light Absorber ◽  
Absorption Performance ◽  
Theoretical Insight ◽  
Insight Into

The optical absorption performance of the perovskite FAPbI3 in the visible-light range is significantly improved by constructing a CdS/FAPbI3 heterostructure.

Charging of particles with intense visible light pulses

1988 ◽  
Vol 19 (4) ◽  
pp. 491-500 ◽  
Author(s):  
R. Niessner ◽  
H. Schröder ◽  
W. Robers ◽  
K.L. Kompa
Keyword(s):  
Visible Light ◽  
Light Pulses

Structural reconstruction and visible-light absorption versus internal electrostatic field in two-dimensional GaN-ZnO alloys

Nanoscale ◽  
2021 ◽  
Author(s):  
Hanpu Liang ◽  
Yifeng Duan
Keyword(s):  
Visible Light ◽  
Electrostatic Field ◽  
Light Absorption ◽  
Red Shift ◽  
Two Dimensional ◽  
Visible Light Absorption ◽  
Visible Light Range ◽  
Optoelectronic Applications

GaN-ZnO alloys are more promising semiconductors than their counterparts for optoelectronic applications due to the abrupt red shift in the visible-light range. Unfortunately, the strong internal electrostatic field (IEF) seriously...

Photoresponsive and Ultraviolet to Visible-Light Range Photocatalytic Properties of ZnO:Sb Nanowires

2011 ◽  
Vol 158 (1) ◽  
pp. K6 ◽  
Author(s):  
Jyh Ming Wu ◽  
Chiung-Wan Fang ◽  
Lin-Tsang Lee ◽  
Hsin-Hsien Yeh ◽  
Yu-Hung Lin ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Properties ◽  
Visible Light Range

scholarly journals Graphene-Assisted Goos–Hänchen Shift in a Planar Multilayer Configuration in the Visible Light Range

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Wei Lin ◽  
Zhichen Xiao ◽  
Wenyun Zhou ◽  
Mengjiao Ren ◽  
Zhiwei Zheng
Keyword(s):  
Optical Properties ◽  
Visible Light ◽  
Fermi Energy ◽  
Optical Sensing ◽  
Optical Beam ◽  
The Novel ◽  
Incident Wavelength ◽  
Visible Light Range

In this paper, the graphene-assisted Goos–Hänchen (GH) shift of the optical beam reflected from a planar multilayer configuration is investigated. The increased positive Goos–Hänchen shifts can be modulated by adjusting the Fermi energy due to graphene with unique optical properties in the visible light range. Moreover, the GH shift can be tuned by varying the layers of graphene, the thickness of the medium, incident wavelength, and so on. These results will be useful for designing the novel graphene-based optical sensing and switching.

scholarly journals High Speed Roll-to-Roll Printable Transistor Enabled by a Pulsed Light Curable CNT Ink

2019 ◽  
Vol 3 (2) ◽  
pp. 33
Author(s):  
Peter Mack Grubb ◽  
Farzad Mokhtari Koushyar ◽  
Travis Lenz ◽  
Aref Asghari ◽  
Gongwen Gan ◽  
...  
Keyword(s):  
High Speed ◽  
Flash Lamp ◽  
Pulsed Light ◽  
Production Methods ◽  
On Demand ◽  
Roll To Roll ◽  
Drop On Demand ◽  
Visible Light Range ◽  
Strong Energy ◽  
Triton X

This paper reports the first high speed roll-to-roll printable transistor using a carbon nanotube (CNT) semiconducting layer. The transistor is made possible through the development of a pulsed light curable CNT ink compatible with typical drop on demand inkjet cartridges. This CNT ink uses a xylene based solvent with methanol, glycerin, and Triton X-100 modifiers to create an evaporable solution with appropriate absorption spectra for a mercury or xenon flash lamp with strong energy transmission in the UVB to mid visible light range, allowing the solution to absorb the energy from the flash lamp and evaporate. Transistor dimensions were defined by the capabilities of a typical roll-to-roll drop on demand cartridge. The final device demonstrated an on/off ratio of 104, representing performance similar to gravure printed devices. This represents the first CNT ink which can be used in high speed production methods without long thermal curing steps in the workflow.

scholarly journals Effect of Substrate Roughness on Oxidation Resistance of an Aluminized Ni-Base Superalloy

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 782 ◽  
Author(s):  
Wojciech J. Nowak ◽  
Kamil Ochał ◽  
Patrycja Wierzba ◽  
Kamil Gancarczyk ◽  
Bartek Wierzba
Keyword(s):  
Oxidation Resistance ◽  
Diffusion Processes ◽  
Preparation Method ◽  
Substrate Surface ◽  
Surface Preparation ◽  
Chemical Vapor ◽  
Substrate Roughness ◽  
Grit Blasting ◽  
Alumina Particles ◽  
Base Superalloy

In the present work, it is shown that the surface preparation method used on two Ni-based superalloys prior to aluminizing chemical vapor deposition (CVD) is one of the most important factors determining the oxidation resistance of aluminized Ni-based superalloys. It was found that grit-blasting the substrate surface negatively affects the oxidation resistance of the aluminized coatings. For grit-blasted and aluminized IN 625, a thicker outer NiAl coating was formed compared to that of IN 738. In contrast, no effect on NiAl coating thickness was found for grit-blasted and aluminized IN 738. However, a thicker interdiffusion zone (IDZ) was observed. It was shown that the systems with grit-blasted surfaces reveal worse oxidation resistance during thermal shock tests—namely, a higher mass loss was observed for both grit-blasted and aluminized alloys, as compared to ground and aluminized alloys. A possible reason for this effect of remaining alumina particles originating from surface grit-blasting on the diffusion processes and stress distribution at the coating/substrate is proposed.

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