Preparation of PDMS ultrathin films and patterned surface modification with cellulose

RSC Advances ◽  
2014 ◽  
Vol 4 (23) ◽  
pp. 11955-11961 ◽  
Author(s):  
Matej Bračič ◽  
Tamilselvan Mohan ◽  
Rupert Kargl ◽  
Thomas Griesser ◽  
Silvo Hribernik ◽  
...  
Keyword(s):  
Surface Modification ◽  
Surface Functionalization ◽  
Ultrathin Films ◽  
Patterned Surface

Patterned surface functionalization of PDMS with the biopolymer cellulose via lithographic methods.

Mussel-inspired surface functionalization of porous carbon nanosheets using polydopamine and Fe3+/tannic acid layers for high-performance electrochemical capacitors

2017 ◽  
Vol 5 (48) ◽  
pp. 25368-25377 ◽  
Author(s):  
Yeong A. Lee ◽  
Jiyoung Lee ◽  
Dae Wook Kim ◽  
Chung-Yul Yoo ◽  
Sang Hyun Park ◽  
...  
Keyword(s):  
Surface Modification ◽  
Tannic Acid ◽  
Surface Functionalization ◽  
Porous Carbon ◽  
High Performance ◽  
Electrochemical Capacitors ◽  
Carbon Nanosheets

The mussel-inspired surface modification for high-performance electrochemical capacitors is demonstrated.

A self-assembled nanoparticle cluster array fabricated using nematic–isotropic phase separation on a functionalized surface

Soft Matter ◽  
2019 ◽  
Vol 15 (33) ◽  
pp. 6696-6702
Author(s):  
Jun-Seo Lee ◽  
Bomi Lee ◽  
Jang-Kun Song
Keyword(s):  
Phase Separation ◽  
Surface Functionalization ◽  
Isotropic Phase ◽  
Patterned Surface ◽  
Self Assembled ◽  
Nanoparticle Cluster ◽  
Functionalized Surface

Fabrication of a self-assembled nanoparticle cluster array using nematic–isotropic phase separation and patterned surface functionalization.

3D Flow Dynamics in a Patterned Round Microchannel

2009 ◽  
Author(s):  
Huihe Qiu ◽  
Peng Zhang
Keyword(s):  
Reynolds Number ◽  
Surface Modification ◽  
Flow Pattern ◽  
Cross Section ◽  
Low Reynolds Number ◽  
The Other ◽  
Surface Charges ◽  
Patterned Surface ◽  
Zeta Potentials ◽  
Low Reynolds

The development of MEMS requires deliberate designs for controlling fluids in the low Reynolds number regime. Arranging surface charges in rectangular channels to obtain in-plane or out-of-plane vortices have been studied by previous researchers. However, previous surface modification techniques require different signs of zeta potentials from the other wall surfaces which made it difficult in selecting and coating microchannels. Previously, the opposite polarities are usually adjusted by changing the pH value of the solution with acid chemicals in other researches which made the solution complicated and difficult to simulate a real application. Meanwhile the acid chemicals may also destroy the coating. It is convenient to use same polarity patches if a vortex flow can also be generated. However, it is not clear if the patterned surface charges have the same polarity of zeta potentials as the other walls, what kind flow pattern will be generated and what mechanism behind the flow pattern. Furthermore, the cross-section of previously studied microchannels is usually limited to a rectangular shape. Therefore, the surface charge patterns are usually in 2D since the sidewalls of the rectangular microchannels are difficult to be patterned. However, a channel with round cross-section has better leak-proof performance of the membrane valve. Furthermore, a round channel is also advantageous in mimicking the human vein when a vascular structure is needed in tissue scaffolding, the round microfluidic channel is considered as a good candidate for an artificial capillary vessel. It is anticipated that there will be no stagnation occurs at the corner edges, which occurs at the corners of a rectangular channel, for a round microchannel owing to the perfectly symmetrical velocity profile. This is important when the microfluidic chip is subjected to a separation process such as liquid chromatography. In this paper, effects of patterned surface modification on 3D vortex flows generation in a micro capillary tube under very low Reynolds number have been investigated. Microfabrication technology was successfully employed to pattern surface charges on inner surfaces of round capillary tubes, which form non-uniform zeta-potentials. This technique extends the heterogeneous surfaces from flat surface to curved surface. 3D vortices are visualized and measured at the vicinity of tube walls when an electric field is applied across the surfaces utilizing micro resolution PIV. It demonstrated that 3D vortices can also be generated by the patterned surface charges with a same polarity. Experimental results have been compared with the numerical simulations using CFD-ACE+.

Surface Functionalization of Silicon MEMS Biochemical Sensors for the Detection of Foodborne Pathogens

2021 ◽  
Author(s):  
Md Ebrahim Khalil Bhuiyan ◽  
Dustin Smith ◽  
Eric J. Voss ◽  
Chin-Chuan Wei ◽  
Mohammad Shavezipur
Keyword(s):  
Surface Modification ◽  
Surface Functionalization ◽  
Foodborne Pathogens ◽  
Silicon Surface ◽  
Chemical Species ◽  
Biological Species ◽  
Dna Aptamer ◽  
Native Oxide ◽  
Sensor Surface ◽  
E Coli

Abstract This work presents the surface modification of silicon chips as a platform for silicon-based biosensors with applications aiming for the detection of foodborne bacteria in aqueous solution. The detection requires high selectivity as the solution may contain a variety of biological species, which affect the outcome of the sensing process. The silicon surface is functionalized by a self-assembled monolayer (SAM) with thiol groups followed by immobilizing a thiol-linked DNA aptamer. The DNA aptamer used in this work has reported to recognize a biological species, E. coli ATCC 25922. The presence of DNA aptamer on the sensor surface allows the capture of the specific E. coli cells on the surface, while other potential biological (and chemical) species would not attach to the sensor surface, thus improving the selectivity of the sensor. The uniform formation of the SAM on the surface is an important step toward uniformly coating the sensor surface with the desired DNA aptamer. The SAM is created on the silicon surface by surface modification with the MPTS (3-mercaptopropyl trimethoxy silane) solution. Then the aptamer DNA solution is applied as droplets on the chip followed by a cure process. The attachment of the SAM and DNA aptamers are verified by atomic force microscopy (AFM). The surface functionalization presented in this work can be used for sensors made of silicon coated with a thin layer of native oxide, and can be adopted for detection of other cells and biological agents using the proper SAM and DNA aptamer.

Surface functionalization of coconut fibers by enzymatic biografting of syringaldehyde for the development of biocomposites

RSC Advances ◽  
2015 ◽  
Vol 5 (94) ◽  
pp. 76844-76851 ◽  
Author(s):  
Kamini Thakur ◽  
Susheel Kalia ◽  
B. S. Kaith ◽  
Deepak Pathania ◽  
Amit Kumar
Keyword(s):  
Surface Modification ◽  
Surface Functionalization ◽  
Reinforcing Material ◽  
Coconut Fibers

Surface modification of coconut fibers was carried out by laccase-assisted biografting of syringaldehyde for their use as reinforcing material in the preparation of biocomposites.

Photolithographically Patterned Surface Modification of Poly(dimethylsiloxane) via UV-Initiated Graft Polymerization of Acrylates

Langmuir ◽  
2006 ◽  
Vol 22 (8) ◽  
pp. 3453-3455 ◽  
Author(s):  
Natasha Patrito ◽  
Claire McCague ◽  
Swanda Chiang ◽  
Peter R. Norton ◽  
Nils O. Petersen
Keyword(s):  
Surface Modification ◽  
Graft Polymerization ◽  
Patterned Surface

Surface Functionalization and Magnetic Motion of Hydrophobic Magnetic Nanoparticles with Different Sizes

2015 ◽  
Vol 13 (1) ◽  
pp. 113-118 ◽  
Author(s):  
Fagen Li ◽  
Wei Wu ◽  
Aifeng Ning ◽  
Jun Wang
Keyword(s):  
Surface Modification ◽  
Magnetic Nanoparticles ◽  
Surface Functionalization ◽  
General Strategy ◽  
Magnetic Liquid ◽  
Mechanical Method ◽  
Hydrophobic Properties ◽  
Liquid Marbles ◽  
Surface Modification Techniques ◽  
Highly Hydrophobic

Abstract A facile and general strategy was successfully developed for the surface modification of hydrophobic Fe3O4 magnetic nanoparticles with various sizes (4–17 nm). The results show that the magnetic and hydrophobic properties are sensitive to the nanoparticle size. For example, the contact angle (CA) of the sample increases as the particle size increases. Using these surface modification techniques allowed the coating of water droplets with highly hydrophobic Fe3O4 nanoparticles to form magnetic liquid marbles through a mechanical method. The behavior of these liquid marbles under the action of a magnetic field revealed that their potential value in electronic, biomedical, self-cleaning, and biochemical applications.

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