Effects of CO2 critical point drying on nanostructured SiO2 thin films after liquid exposure

Shah, Piyush; Wu, Zhi Min; Sarangan, Andrew

doi:10.1016/j.tsf.2012.10.057

Cited by 6 publications

(3 citation statements)

References 13 publications

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“…Although it is still a subject of controversy, it seems that a critical factor controlling nanocarpet formation is the penetration of the liquid into the inter-rod space of the 1D nanostructured surfaces. Although the literature on this subject has mainly focused on CNT arrays, its expected impact in biomedical research, superhydrophobicity and microfluidics has fostered the investigation of other systems such as OAD nanorods of Si [572][573][574], functionalized Si [575], SiO 2 [576,577], carbon [485], metal [578] and ZnO [563]. Indeed, the nanocarpet effect has already served to increase the WCA on 1D surfaces [563,573] through the formation of a double or hierarchical roughness.…”

Section: Nanocarpet Effectmentioning

confidence: 99%

Perspectives on oblique angle deposition of thin films: From fundamentals to devices

Barranco

Borrás

González‐Elipe

et al. 2016

Progress in Materials Science

603

436

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a b s t r a c tThe oblique angle configuration has emerged as an invaluable tool for the deposition of nanostructured thin films. This review develops an up to date description of its principles, including the atomistic mechanisms governing film growth and nanostructuration possibilities, as well as a comprehensive description of the applications benefiting from its incorporation in actual devices. In contrast with other reviews on the subject, the electron beam assisted evaporation technique is analyzed along with other methods operating at oblique angles, including, among others, magnetron sputtering and pulsed laser or ion beam-assisted deposition techniques. To account for the existing differences between deposition in vacuum or in the presence of a plasma, mechanistic simulations are critically revised, discussing well-established paradigms such as the tangent or cosine rules, and proposing new models that explain the growth of tilted porous nanostructures. In the second part, we present an extensive description of applications wherein oblique-angle-deposited thin films are of relevance. From there, we proceed by considering the requirements of a large number of functional devices in which these films are currently being utilized (e.g., solar cells, Li batteries, electrochromic glasses, biomaterials, sensors, etc.), and subsequently describe how and why these nanostructured materials meet with these needs.

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Section: Nanocarpet Effectmentioning

confidence: 99%

Perspectives on oblique angle deposition of thin films: From fundamentals to devices

Barranco

Borrás

González‐Elipe

et al. 2016

Progress in Materials Science

603

436

View full text Add to dashboard Cite

show abstract

“…Other decellularization protocols that utilize ethanol as the decellularization solvent have reported similar tissue dehydration [34], so the observed extraction of water and volatiles during treatment with scCO 2 and ethanol is not surprising. In fact, water extraction is very similar to critical point drying, which is commonly used in tissue engineering [35] and other applications, such as electronics processing [36] and scanning electron microscopy [37]. However, for decellularization it is desirable to prevent drying entirely.…”

Section: Introductionmentioning

confidence: 99%

A novel supercritical CO 2 -based decellularization method for maintaining scaffold hydration and mechanical properties

Casali

Handleton

Shazly

et al. 2018

The Journal of Supercritical Fluids

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A B S T R A C TDecellularized tissues are commonly utilized as tissue engineering scaffolds. Decellularization by extended exposure to aqueous detergents can damage the microstructure or deposit cytotoxic residue. Supercritical carbon dioxide (scCO 2 ) has been proposed for decellularization, but reportedly causes dehydration and scaffold embrittlement.Presented herein is a novel decellularization method that preserves matrix hydration state and mechanical properties. Over 97% of the water in porcine aorta is maintained by presaturating scCO 2 with water; however, complete decellularization was not attained by any process utilizing only scCO 2 . Instead, a novel hybrid method is presented that combines a brief (48 h) exposure of tissue to aqueous detergent, followed by washing with scCO 2 (1 h). The hybrid method fully decellularized the tissue, as confirmed by histology and DNA quantification (<0.04 μg DNA/mg tissue). This hybrid treatment was faster than the standard method (2 days compared to 4-7 days), while preserving tissue structure and mechanical properties.

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“…Nano/micro pillars with high aspect ratios and dense arrays are more prone to deformation by capillary forces . A postprocessing step such as CO 2 critical point drying can help in enhancing the uniformity of the submicron pillars. , Although printing over large areas could not give us 100% uniform submicron patterns in this study, the uniformity significantly enhanced after optimization of 2PP parameters in the Piezo writing strategy, testing various print configurations, and applying a manual tilt correction.…”

Section: Resultsmentioning

confidence: 72%

Submicron Patterns-on-a-Chip: Fabrication of a Microfluidic Device Incorporating 3D Printed Surface Ornaments

Nouri‐Goushki

Sharma

Sasso

et al. 2019

ACS Biomater. Sci. Eng.

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Manufacturing high throughput in vitro models resembling the tissue microenvironment is highly demanded for studying bone regeneration. Tissues such as bone have complex multiscale architectures inside which cells reside. To this end, engineering a microfluidic platform incorporated with three-dimensional (3D) microscaffolds and submicron/nanoscale topographies can provide a promising model for 3D cell cultures. There are, however, certain challenges associated with this goal, such as the need to decorate large surfaces area with high-fidelity 3D submicron structures. Here, we succeeded in fabricating a microfluidic platform embedded with a large area (mm range) of reproducible submicron pillar-based topographies. Using the two-photon polymerization (2PP) as a 3D printing technique based on direct laser writing, uniform submicron patterns were created through optimization of the process parameters and writing strategy. To demonstrate the multiscale fabrication capabilities of this approach, submicron pillars of various heights were integrated onto the surfaces of a 3D microscaffold in a single-step 2PP process. The created submicron topography was also found to improve the hydrophilicity of the surface while being able to withstand flow rates of up to 8 mL/min. The material (IP-Dip resin) used for patterning did not have cytotoxic effects against human mesenchymal stromal cells after 3 days of dynamic culture in the microfluidic device. This proof-of-principle study, therefore, marks a significant step forward in manufacturing submicron structure-on-a-chip models for bone regeneration studies.

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Effects of CO2 critical point drying on nanostructured SiO2 thin films after liquid exposure

Cited by 6 publications

References 13 publications

Perspectives on oblique angle deposition of thin films: From fundamentals to devices

Perspectives on oblique angle deposition of thin films: From fundamentals to devices

A novel supercritical CO 2 -based decellularization method for maintaining scaffold hydration and mechanical properties

Submicron Patterns-on-a-Chip: Fabrication of a Microfluidic Device Incorporating 3D Printed Surface Ornaments

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