A superhydrophobic dual-scale engineered lotus leaf

Kim, Dong-Hyun; Kim, Joonwon; Park, Hyun C.; Lee, Kun-H; Hwang, Woonbong

doi:10.1088/0960-1317/18/1/015019

Cited by 44 publications

(39 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Our search in the main scientific databases have returned only four records of such papers and all of them are written in the last five years, that can be attributed to the growing interest in such technologies. Two of the studies deal with the use of anodic aluminium oxide as a template [17,18]. The third one reports the use of a filter paper to form the lotus-like features during cold pressing of PTFE with subsequent sintering [19].…”

Section: Introductionmentioning

confidence: 99%

Surface texturing of polytetrafluoroethylene by hot embossing

Jucius

Guobienė

Grigaliūnas

2010

Applied Surface Science

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Surface texturing of polytetrafluoroethylene by hot embossing

Jucius

Guobienė

Grigaliūnas

2010

Applied Surface Science

View full text Add to dashboard Cite

“…Some examples from nature are the self-cleaning surface of the lotus blossom (Nosonovsky and Bhushan 2008;Kim et al 2008;Lee et al 2007; Lee et al 2006), the nonreflecting cornea of moths' eyes, tribological and hydrodynamic performance of scales on beaked salmon and shark skins. In addition, changing the surface properties by modifying their surface topography is particularly of interest in cases in which coatings are not allowed.…”

Section: Introductionmentioning

confidence: 99%

Study on the replication quality of micro-structures in the injection molding process with dynamical tool tempering systems

et al. 2010

View full text Add to dashboard Cite

The injection molding of micro-structures is a promising mass-production method for a broad range of materials. However, the replication quality of these structures depends significantly on the heat flow during the filling stage. In this paper, the filling and heat transfer of v-groove and random structures below 5 lm is investigated with the help of an AFM (atomic force microscope) and thermo couples. A numerical model is developed to predict the filling of surface structures during the filling and packing stage. The model implies the use of simple fully developed flow models taking the power-law material model into account. This permits investigation into which ways several processing parameters affect the polymer flow in the surface structures. The mold wall temperature, which has significant effects on the polymer flow, is varied by using a variothermal mold temperature control system to validate the model proposed.

show abstract

“…Reported micropattern techniques such as X-ray lithography, electroplating, and molding (18), synchrotron radiation (19), and ion beam writing (20) are either too expensive or require serial processing. Because PFA and FEP are melt-processible, microfeatures can be transferred into them with thermo molding using micropatterned masters in silicon, glass, and metals (21)(22)(23). However, air is often trapped during the molding and very limited types of microfeatures can be formed.…”

mentioning

confidence: 99%

Whole-Teflon microfluidic chips

Ren

Dai

Zhou

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

200

187

View full text Add to dashboard Cite

Although microfluidics has shown exciting potential, its broad applications are significantly limited by drawbacks of the materials used to make them. In this work, we present a convenient strategy for fabricating whole-Teflon microfluidic chips with integrated valves that show outstanding inertness to various chemicals and extreme resistance against all solvents. Compared with other microfluidic materials [e.g., poly(dimethylsiloxane) (PDMS)] the whole-Teflon chip has a few more advantages, such as no absorption of small molecules, little adsorption of biomolecules onto channel walls, and no leaching of residue molecules from the material bulk into the solution in the channel. Various biological cells have been cultured in the whole-Teflon channel. Adherent cells can attach to the channel bottom, spread, and proliferate well in the channels (with similar proliferation rate to the cells in PDMS channels with the same dimensions). The moderately good gas permeability of the Teflon materials makes it suitable to culture cells inside the microchannels for a long time.microchips | on-chip cell culture | solvent resistive chip T his report describes a convenient method for the fabrication of whole-Teflon microfluidic chips; we also integrate microvalves into the chips and demonstrate a few key applications of the whole-Teflon microfluidic chips with various organic solvents and biomolecules, and for culturing biological cells.Microfluidics (1) emerged during the early 1990s with channel networks in silicon or glass. Microprocessing of these materials is labor-intensive and time-consuming, it requires sophisticated equipment in a clean room, and often involves hazardous chemicals. The subsequent use of poly(dimethylsiloxane) (PDMS) greatly simplified the fabrication of microchips (2) and led to the rapid development of the field. PDMS has other attractive properties, such as being elastic (easy to make efficient microvalves), permeable to gases, and compatible with culturing biological cells. Despite these advantages, applications of PDMS chips are severely limited by a few drawbacks that are inherent to this material: (i) strong adsorption of molecules, particularly large biomolecules, onto its surface (3); (ii) absorption of nonpolar and weakly polar molecules into PDMS bulk; (iii) leaching of small molecules from PDMS bulk into solutions; and (iv) incompatibility with organic solvents. Therefore, special attention must be paid when quantitative analysis is needed (materials lost on channel walls and into the PDMS bulk) or organic solvents are involved. Because many drug molecules are small with relatively low polarity and cells can be very sensitive to their environment, data interpretation requires particular caution when cell-based drug screening and cell culturing are performed on PDMS microchips. Various techniques (4-8) have been proposed to modify PDMS bulk and surface properties, but they normally complicate the fabrication and still cannot effectively solve the problems. Most other plastics (9-11) have simi...

show abstract

A superhydrophobic dual-scale engineered lotus leaf

Cited by 44 publications

References 46 publications

Surface texturing of polytetrafluoroethylene by hot embossing

Surface texturing of polytetrafluoroethylene by hot embossing

Study on the replication quality of micro-structures in the injection molding process with dynamical tool tempering systems

Whole-Teflon microfluidic chips

Contact Info

Product

Resources

About