A conventional route to scalable morphology-controlled regular structures and their superhydrophobic/hydrophilic properties for biochips application

Abstract

We use a conventional and straightforward route to fabricate scalable morphology-controlled regular structures. This route is based on the etching of PDMS microlens array in CF4 and CF4/O2 plasma. PDMS microlens array can be changed to regularly isolated microdot structures array in CF4 plasma. Microbowl shaped structures array can be reached in CF4/O2 plasma. Moreover, a set of structures after CF4 plasma treatment display superhydrophobicity, while a set of structures after CF4/O2 plasma treatment present hydrophilicity. DNA molecules can be readily enriched on the hydrophilic surface. We believe that the regular structure array surfaces provide a useful inspiration towards biomolecular detection and transportation in biochips.

Polyol synthesis of α-NiS particles and its physico-chemical properties

“…The peak at 284 eV infers the occurrence of carbon. It has been previously reported that the observed peaks at the binding energy of 530 and 532 eV attributes the chemisorptions of hydroxyl groups with nickel and the adsorbed H 2 O on the surface [36][37][38][39][40]. The observed high intensity hydroxyl peaks indicate the inclusion of a large amount of surface oxygen absorbed by the material.…”

Hierarchical micro and nano structured, hydrophilic, superhydrophobic and superoleophobic surfaces incorporated in microfluidics, microarrays and lab on chip microsystems

“…This lack of a need for superhydrophobic confinement reduces the processing steps. Ren et al nanotextured PDMS with preformed microlens structures in CF 4 and CF 4 /O 2 plasmas and noticed that while the first plasma produced superhydrophobic surfaces, the second plasma produced hydrophilic nanotextured areas on which DNA could be enriched [162] (see Fig. 8(ii)).…”

A Review of Femtosecond‐Laser‐Induced Underwater Superoleophobic Surfaces

“…Superhydrophobic surface is the earliest and the most widely studied interface in the field of superwettability because of its remarkable water repellence . Inspired by the superhydrophobicity of lotus leaf, thousands of artificial superhydrophobic surfaces have been fabricated, and those surfaces are wildly applied in self‐cleaning coatings, microdroplets manipulation, oil/water separation, anticorrosion, antifog/ice/snow, drag reduction, antifouling, cell engineering, water collection, microfluidics, lab chips, etc. After more than 20 years of development, both the basic theory and the fabrication technologies for superhydrophobic surfaces have reached a high level.…”