Biological materials: Functional adaptations and bioinspired designs

We present a simple yet robust method for fabricating angled,hierarchically patterned high-aspect-ratio polymer nanohairs togenerate directionally sensitive dry adhesives. The slanted poly-mericnanostructuresweremoldedfromanetchedpolySisubstratecontaining slanted nanoholes. An angled etching technique wasdevelopedtofabricateslantednanoholeswithﬂattipsbyinsertingan etch-stop layer of silicon dioxide. This unique etching methodwas equipped with a Faraday cage system to control the ion-incident angles in the conventional plasma etching system. Thepolymeric nanohairs were fabricated with tailored leaning angles,sizes, tip shapes, and hierarchical structures. As a result of con-trolled leaning angle and bulged ﬂat top of the nanohairs, thereplicated, slanted nanohairs showed excellent directional adhe-sion, exhibiting strong shear attachment ( 26 N/cm

https://www.pnas.org/content/pnas/106/14/5639.full.pdf

A nontransferring dry adhesive with hierarchical polymer nanohairs.

The amazing adhesion of gecko pads to almost any kind of surfaces has inspired a very active research direction over the last decade: the investigation of how geckos achieve this feat and how this knowledge can be turned into new strategies to reversibly join surfaces. This article reviews the fabrication approaches used so far for the creation of micro- and nanostructured fibrillar surfaces with adhesive properties. In the light of the pertinent contact mechanics, the adhesive properties are presented and discussed. The decisive design parameters are fiber radius and aspect ratio, tilt angle, hierarchical arrangement and the effect of the backing layer. Also first responsive systems that allow thermal switching between nonadhesive and adhesive states are described. These structures show a high potential of application, providing the remaining issues of robustness, reliability, and large-area manufacture can be solved.

Gecko-inspired surfaces: a path to strong and reversible dry adhesives.

The complex structures that allow geckos to repeatably adhere to surfaces consist of multilevel branching fibers with specialized tips. We present a novel technique for fabricating similar multilevel structures from polymer materials and demonstrate the fabrication of arrays of two- and three-level structures, wherein each level terminates in flat mushroom-type tips. Adhesion experiments are conducted on two-level fiber arrays on a 12-mm-diameter glass hemisphere, which exhibit both increased adhesion and interface toughness over one-level fiber samples and unstructured control samples. These adhesion enhancements are the result of increased surface conformation as well as increased extension during detachment.

Enhanced Adhesion by Gecko-Inspired Hierarchical Fibrillar Adhesives

This work was supported by National Research Foundation of Korea (NRF) grant (No. 20110017530), WCU (World Class University) program (R31-2008-000-10083-0) on multiscale mechanical design, and Basic Science Research Program (2010-0027955) funded by the Ministry of Education, Science, and Technology (MEST). This work was supported in part by the Award No KUK-F1-037-02, made by King Abdullah University of Science and Technology (KAUST) and Institute of Advanced Machinery and Design (IAMD) of Seoul National University.

Rational Design and Enhanced Biocompatibility of a Dry Adhesive Medical Skin Patch

A new method for the fabrication of structured polymer surfaces possessing pillars with controlled 3D tip geometries resembling those found in biological attachment devices is re-ported. The fabrication strategy exploits the filling mechanism of 2D lithographic templates, combined with inking and printing steps using elastomeric precursors with various viscosities and crosslinking kinetics. Homogeneously structured areas were obtained that allow reproducible and reliable testing of adhesion behavior and can be scaled up to prototypes. The re-sults presented here provide the first experimental evidence of the influence of the contact shape in adhesion of structured surfaces and pave the road to a better understanding of bio-logical-attachment systems and to optimum designs of artificial analogues.

Patterned Surfaces with Pillars with Controlled 3D Tip Geometry Mimicking Bioattachment Devices

A new method for the fabrication of microstructured polymer surfaces possessing features with different 3D geometries is reported Controlled micromolding using masters with 2D topographies and fluid elastomeric precursors with various viscosities and crosslinking kinetics yielded homogeneously structured surfaces possessing microtubes and concave and convex hemispheres with defined dimensions This fabrication strategy does not require sophisticated 3D structuring equipment and can be extended to other materials, dimensions and geometries

3D microstructured surfaces obtained by soft-lithography using fast-crosslinking elastomeric precursors and 2D masters

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.

I. Alvarez

Author Tools

Chat about Author

Papers

Patterned Surfaces with Pillars with Controlled 3D Tip Geometry Mimicking Bioattachment Devices

3D microstructured surfaces obtained by soft-lithography using fast-crosslinking elastomeric precursors and 2D masters