Fabrication of TiO<sub>2</sub>Nanowires Using Vapor-Liquid-Solid Process for the Osseointegration

Yun, Young-Sik; Kang, Eun‐Hye; Yun, In Sik; Kim, Yong Oock; Yeo, Jong‐Souk

doi:10.5757/jkvs.2013.22.4.204

Cited by 2 publications

(3 citation statements)

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“…Also they said that Ti and TiO 2 come from substrate since TiO vapor pressure is low, then diffusion of Ti atoms from substrate for nanowires growth is necessary and different morphologies of TiO 2 nanowires depend on Ti phase difference at various temperatures and diffusion rates [17]. Some others did not use material source but thought that vapor from substrate was main factor [20,21,23]. By passing a mixture of Argon gas flow and acetone/ alcohol/acetaldehyde (as oxygen sources) at 850°C, Peng et al oxidized the Ti substrate and obtained TiO 2 NWs.…”

Section: The Materials B (C) Diffuses Toward the Outside (Inside)mentioning

confidence: 97%

“…The source could be obtained by a chemical reaction, say carbothermal reduction of titanium in the presence of carbon [11][12][13] or via Ti, or TiO powder evaporation [8][9][10][17][18][19][20][21]. In terms of existence or absence of catalyst, the growth mechanisms proposed for this method are in two groups: (1.1) vaporsolid (VS) (1.2) and vapor-liquid-solid (VLS).…”

Section: Introductionmentioning

confidence: 98%

“…There are many reports on the synthesis of TiO 2 nanowires [14][15][16][17][18][19][20][21][22][23][24][25][26][27] where have used first or second methods and all of them have common feature, namely presence of Ti layer on substrate before nanostructures growth. These processes are indicated by star symbol in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Growing TiO2 nanowires by solid–liquid–solid mechanism including two factors (Ti and O)

Pishekloo

Dariani

2016

Appl. Phys. A

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Identifying the growth factors of nanowires helps in controlling their structure and morphology and determining their optimal growth conditions. This study investigates the effect of titanium substrate in growing TiO 2 nanowires (NWs) with evaporation method. It reveals that the titanium in substrate is indeed the main source of growth. Using the substrate as the only source of growth with regulated amount of accessible oxygen in the furnace, NWs with lengths ranging from 1 to 70 lm were obtained. The results of the experiments show that the nanowires' growth is mainly controlled by diffusion of titanium atoms from the substrate through TiO 2 grain boundaries and surface diffusion toward NWs' tips rather than adsorption from vapor phase. The solid-liquid-solid mechanism including two factors (Ti and O) is proposed and discussed for growth of TiO 2 NWs.

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Section: The Materials B (C) Diffuses Toward the Outside (Inside)mentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

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Growing TiO2 nanowires by solid–liquid–solid mechanism including two factors (Ti and O)

Pishekloo

Dariani

2016

Appl. Phys. A

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Quantitative Correlation of Nanotopography with Cell Spreading via Focal Adhesions Using Adipose‐Derived Stem Cells

Yun

Kang

et al. 2020

Adv. Biosys.

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also reflect stem cell fate. [3-6] Stem cells adhere to the extracellular matrix and thereby respond to the external environment, including topography and mechanical properties. [7-9] Stem cells regulate cell fate by interacting with their specific external micro environment, also called a stem cell niche. Stem cell niches are generally comprised of biochemical and physical components. [10] As a physical cue, surface topography has been investigated to understand the interactions between cells and their surrounding environments and its effects on cell function and behavior. [11-15] Due to the scale of the structures mimicking extracellular environments, nanotopography has significant potential for determining cellular responses induced by topographical effects, such as cell adhesion, [16] selfrenewal, [17] and differentiation. [18-20] Surface topography influences cellular responses, including morphological changes of ASCs. Typical substrates such as ridge/groove, pillar/rod type, and porous surface may mimic the niche and reveal their correlation and control cellular responses; however, their direct relationship still remains unclear. [21-24] The ridge-groove structure has been widely used owing to its topographical alignment, which is crucial in determining the stem cell fate for specific cell lineages. [25] However, anisotropic topography is not suitable for universal studies on the effects of topography on cellular responses. The pillar structure referred to in the present study may help to better understand the correlation between topography and cellular responses as topographic arrangement can be altered from isotropy to anisotropy by changing pillar arrays. [26-28] Using pillar structures, the quantitative effect of topography can be measured by varying the pillar size. Proper designing of surface topography can modulate cellular responses. [29] The size of the topography is also an important factor affecting cell morphology and stem cell fate. [22,30] Compared to adherent cells on the planar surface, confined adhesive areas on the top surface of the nanopillar array decrease cell spreading. [31,32] Moreover, cell spreading is inhibited when the diameters of the pillar array reduce considerably in size. [23] Focal adhesion (FA) has been discussed as a key to understanding the role of topography for cellular responses. [7,33] FA Nanotopography mimicking extracellular environments reportedly impact cell morphological changes; however, elucidating this relationship has been challenging. To control cellular responses using nanostructures, in this study, the quantitative relationship between nanotopography and cell spreading mediated by focal adhesions (FAs) is demonstrated using adipose-derived stem cells (ASCs). The spreading of ASCs and area of FAs are analyzed for the distribution of filamentous actin and vinculin, respectively, using fluorescent images. FAs require a specific area for adhesion (herein defined as effective contact area [ECA]) to maintain cell attachment on nanopillar arrays. An ECA is the a...

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Fabrication of TiO₂Nanowires Using Vapor-Liquid-Solid Process for the Osseointegration

Cited by 2 publications

References 18 publications

Growing TiO2 nanowires by solid–liquid–solid mechanism including two factors (Ti and O)

Growing TiO2 nanowires by solid–liquid–solid mechanism including two factors (Ti and O)

Quantitative Correlation of Nanotopography with Cell Spreading via Focal Adhesions Using Adipose‐Derived Stem Cells

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Fabrication of TiO2Nanowires Using Vapor-Liquid-Solid Process for the Osseointegration

Cited by 2 publications

References 18 publications

Growing TiO2 nanowires by solid–liquid–solid mechanism including two factors (Ti and O)

Growing TiO2 nanowires by solid–liquid–solid mechanism including two factors (Ti and O)

Quantitative Correlation of Nanotopography with Cell Spreading via Focal Adhesions Using Adipose‐Derived Stem Cells

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Fabrication of TiO₂Nanowires Using Vapor-Liquid-Solid Process for the Osseointegration