Preparation of phase-separated textures and crystalline phases from two-liquid immiscible melts in the TiO2–SiO2 system

Katsumata, Ken Ichi; Kameshima, Yoshikazu; Okada, Kiyoshi; Yasumori, Atsuo

doi:10.1016/j.materresbull.2004.02.011

Cited by 14 publications

(4 citation statements)

References 14 publications

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“…The cones then started to converge, resulting in a TiO 2 (rutile) micronetwork with a height of 3 μm after 200 pulses. This kind of structural evolution with accumulating laser pulses is strongly analogous to the phase-separation textures prepared by rapid quenching of a TiO 2 −SiO 2 melt; with an increase in the TiO 2 volume fraction, the texture changes from binodal-type isolated particles to a spinodal-type continuous structure . On the basis of this analogy, one possible mechanism for this is as follows.…”

Section: Resultsmentioning

confidence: 86%

Formation of a TiO₂ Micronetwork on a UV-Absorbing SiO₂-Based Glass Surface by Excimer Laser Irradiation

et al. 2005

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We report on the preparation of TiO2 micronetworks on a UV-absorbing Na2O−TiO2−SiO2 glass surface by excimer laser irradiation, a technique we have called laser-induced superficial phase separation. The TiO2 micronetworks that were formed on the etched glass surface were in the rutile crystalline phase and exhibited a photocatalytic capability. We were also able to form a range of TiO2 micronetworks in an array of 20-μm holes. This flexible formation of photocatalytic TiO2 networks on a glass surface without any heat treatments could enable a new route for developing novel microdevices, such as monolithic microfluidics with light-catalyzed reactions and miniaturized solar batteries.

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Section: Resultsmentioning

confidence: 86%

Formation of a TiO₂ Micronetwork on a UV-Absorbing SiO₂-Based Glass Surface by Excimer Laser Irradiation

et al. 2005

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show abstract

“…The cones then started to converge, resulting in a TiO 2 micronetwork with a height of 3 µm after 200 pulses. This kind of structural evolution with accumulating laser pulses is strongly analogous to the phase-separation textures prepared by rapid quenching of a TiO 2 -SiO 2 melt; with an increase in the TiO 2 volume fraction, the texture changes from binodal-type isolated particles to a spinodal-type continuous structure [13]. On the basis of this analogy, one possible mechanism for this is as follows.…”

Section: Evolution Of Laser-induced Structures With the Number Of Lasmentioning

confidence: 86%

“…Because alkali oxide has a higher vapor pressure than TiO 2 and SiO 2 , the alkali oxide tends to evaporate more easily, causing a compositional shift toward a TiO 2 -SiO 2 binary system at the etched surface. According to the phase diagram of the TiO 2 -SiO 2 system [13], the immiscibility region has a wide range from ca. 20 to 90 mass% of TiO 2 above 1780 °C, resulting in two liquids.…”

Section: Evolution Of Laser-induced Structures With the Number Of Lasmentioning

confidence: 99%

Laser-induced formation of photocatalytic TiO 2 micro networks on a UV-absorbing glass surface

et al. 2007

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Laser-induced formation of functional materials from glasses has a great potential for creation of monolithic and highperformance glass-based devices, such as optical circuit and micro-TAS. We have recently developed a laser-induced formation technique of photocatalytic titanium oxide on a UV-absorbing TiO 2 -SiO 2 -based glass surface by excimer laser irradiation under a specific condition, which we term laser-induced superficial phase separation. The laser-induced structure has the shape of micro-cones, growing into micro-sized network after accumulating laser pulses, which we call TiO 2 micronetwork. The TiO 2 micronetwork exhibited the rutile crystalline phase and photocatalytic ability. Moreover, the crystalline phase can be controlled from the rutile to the anatase by post-treatments. Utilizing this technique, we were able to make a site-selective growth of TiO 2 micronetworks: a microwell array and a microchannel modified with the TiO 2 network only on the bottom. This flexible formation of photocatalytic TiO 2 onto a glass surface without any heattreatments and/or adhesives opens a new way to develop a monolithic glass device like micro-fluidics with lightcatalyzed reactions.

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“…LPS was studied by Nakagawa in Cu–Co and Cu–Fe binary systems for the first time [ 20 ]. Up to now, it has been observed in a variety of materials, including metals, polymers, and ceramics [ 21 , 22 , 23 ]. For metals, LPS has been reported in Cu–Co [ 24 , 25 ], Cu–Fe [ 24 , 26 , 27 ], Cu–Cr [ 28 ], Cu–Nb [ 29 ], Cu–Fe–Co [ 24 , 30 ], Cu–Nb–Ni [ 31 ], Ag–Nb–Ni [ 32 ], Cu–Cr–Si [ 33 ], Fe–Cu–Si [ 26 ], and other binary and ternary alloy systems.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Phase Separation on the Mechanical Behavior of the Co–Cr–Cu–Fe–Ni High-Entropy Alloy

Liu

Peng

et al. 2021

Materials

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Phase separation phenomena in high-entropy alloys (HEAs) have attracted much attention since their discovery, but little attention has been given to the dynamics of the deformation mechanism of this kind of HEA during uniaxial tension, which limits their widespread and practical utility. In this work, molecular dynamics simulation was used to study the effect of phase separation on the mechanical properties of an HEA under uniaxial tensile loading. Moreover, the associated deformation behavior of the Co–Cr–Cu–Fe–Ni HEA was investigated at the nanoscale. Models with Cu-rich grain boundaries or grains were constructed. The results showed that Cu-rich grain boundaries or grains lowered the strength of the Co–Cr–Cu–Fe–Ni HEA, and Cu-rich grain boundaries significantly reduced ductility. This change of mechanical properties was closely associated with a deformation behavior. Furthermore, the deformation behavior was affected by the critical resolved shear stress of Cu-rich and Cu-depleted regions and the uneven stress distribution caused by phase separation. In addition, dislocation slipping and grain boundary sliding were the main mechanisms of plastic deformation in the Co–Cr–Cu–Fe–Ni HEA.

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Preparation of phase-separated textures and crystalline phases from two-liquid immiscible melts in the TiO2–SiO2 system

Cited by 14 publications

References 14 publications

Formation of a TiO₂ Micronetwork on a UV-Absorbing SiO₂-Based Glass Surface by Excimer Laser Irradiation

Formation of a TiO₂ Micronetwork on a UV-Absorbing SiO₂-Based Glass Surface by Excimer Laser Irradiation

Laser-induced formation of photocatalytic TiO 2 micro networks on a UV-absorbing glass surface

The Effect of Phase Separation on the Mechanical Behavior of the Co–Cr–Cu–Fe–Ni High-Entropy Alloy

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Preparation of phase-separated textures and crystalline phases from two-liquid immiscible melts in the TiO2–SiO2 system

Cited by 14 publications

References 14 publications

Formation of a TiO2 Micronetwork on a UV-Absorbing SiO2-Based Glass Surface by Excimer Laser Irradiation

Formation of a TiO2 Micronetwork on a UV-Absorbing SiO2-Based Glass Surface by Excimer Laser Irradiation

Laser-induced formation of photocatalytic TiO 2 micro networks on a UV-absorbing glass surface

The Effect of Phase Separation on the Mechanical Behavior of the Co–Cr–Cu–Fe–Ni High-Entropy Alloy

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Formation of a TiO₂ Micronetwork on a UV-Absorbing SiO₂-Based Glass Surface by Excimer Laser Irradiation

Formation of a TiO₂ Micronetwork on a UV-Absorbing SiO₂-Based Glass Surface by Excimer Laser Irradiation