Functional polymer surfaces for controlling cell behaviors

Direct bonding is an attractive technique for joining two mirror polished surfaces without any intermediate materials. Vacuum ultraviolet (VUV) irradiation is an effective way for cleaning surfaces as well as increasing hydrophilicity with less surface damage. However, its applications for the direct bonding of silicon and quartz glasses have seldom been explored. Therefore, in this paper, a vacuum ultraviolet/ozone (VUV/O3) activated direct bonding method for Si/Si and quartz/quartz was developed. A defect-free interface with high bonding strength was achieved after a low-temperature annealing process at 200 °C. According to water contact angle, Raman spectroscopy, atomic force microscopy, and transmission electron microscopy measurements, we demonstrated an understanding of the beneficial surface treatments from VUV irradiation. Then two models for Si/Si and quartz/quartz bonding were established separately based on low-temperature water stress corrosion. Our studies found that the increase of surface roughness with the extension of VUV irradiation time was attributed to the oxide asperities generated on the irradiated surfaces, which possessed strong deformability under the water stress corrosion effect. The excellent bonding benefits from the saturated silanol groups formed on the VUV irradiated surfaces and the positive effects of the interfacial water on the gap closure during the annealing process.

/pdf/mechanisms-for-low-temperature-direct-bonding-of-si-si-and-4ys0kwh9zb.pdf

Mechanisms for low-temperature direct bonding of Si/Si and quartz/quartz via VUV/O3 activation

A smart contact lens, envisioned to correct or improve vision, entails the integration of several electronic components such as: Si chips, a power source and an electro-optic module. All of them being interconnected by non-conventional electrical layouts in a fully stretchable platform. Such a platform must be designed with strict geometrical requirements and material limitations, to attain compulsory characteristics such as: biocompatibility, oxygen/light transparency, and being imperceptible by the human eye. To favor fabrication throughput, our approach encompasses the development of the thermoplastic platform on a planar manner, in order to thermoform it afterwards into a curvilinear spherical shape by means of metallic molds. Thermoforming induces mechanical stress resulting in distributed strain regions (mainly localized at the edges), which directly affects the integrity of the components. For this reason, here we present a finite element model FEM (using COMSOL) of the thermoforming step corroborated by experimental data, in order to analyze the strain development on the lens surface making emphasis on the wrinkle formation at the edge. The thermoplastic was modelled in the static domain, in 2D-axial symmetry and 3D spaces with defined contact to the molds and free boundary conditions elsewhere. The thermoforming process was performed at several temperatures (i.e. from 80 °C to 140 °C) for two 100 μm-thick thermoplastic carriers (i.e. polyethylene terephthalate – PET and polyurethane PUT) using molds of 8 mm of radius. The measured strain and shape after the thermoforming were in good agreement with the FEM models, showing compressive hoop strains in the order of -10±2% at the border of the lens (radius of 6.5 mm), and close to zero radial strain. Non-axial symmetrical crumpling and wrinkles at the border were found out for temperatures below 100°C and radii bigger than 5 mm, and were reproduced and analyze with 3D FEM models. Finally, the output trends of the modelling were employed as guidelines to design and optimize “horse shoe” meander interconnections to increase the robustness and reliability of the whole system. Such modeling and designing approach could be applied for diverse types of thermoforming steps of soft materials (i.e. thermoplastic polymers) in order to enhance the mechanical integrity and proper component location.

Stretchable electronic platform for soft and smart contact lens applications

Vacuum ultraviolet trimming of oxygenated functional groups from oxidized self-assembled hexadecyl monolayers in an evacuated environment

Effect of VUV-excimer lamp treatment on cellulose fiber

VUV treatment combined with mechanical strain of stretchable polymer foils resulting in cell alignment

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

S. Innerbichler

Author Tools

Chat about Author

Papers

VUV treatment combined with mechanical strain of stretchable polymer foils resulting in cell alignment