scholarly journals Surface Modification Enabling Reproducible Cantilever Functionalization for Industrial Gas Sensors

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6041
Author(s):  
Daniel Mamou ◽  
Lawrence Nsubuga ◽  
Tatiana Lisboa Marcondes ◽  
Simon Overgaard Høegh ◽  
Jeanette Hvam ◽  
...  
Keyword(s):  
Surface Energy ◽  
Surface Properties ◽  
Gas Sensing ◽  
Industrial Applications ◽  
Cantilever Sensors ◽  
Target Capture ◽  
Functionalized Surfaces ◽  
Cantilever Surface ◽  
Target Binding ◽  
Micro Cantilever

Micro-cantilever sensors are a known reliable tool for gas sensing in industrial applications. We have demonstrated the application of cantilever sensors on the detection of a meat freshness volatile biomarker (cadaverine), for determination of meat and fish precise expiration dates. For achieving correct target selectivity, the cantilevers need to be functionalized with a cadaverine-selective binder, based on a cyclam-derivative. Cantilever surface properties such as surface energy strongly influence the binder morphology and material clustering and, therefore, target binding. In this paper, we explore how chemical and physical surface treatments influence cantilever surface, binder morphology/clustering and binding capabilities. Sensor measurements with non-controlled surface properties are presented, followed by investigations on the binder morphology versus surface energy and cadaverine capture. We demonstrated a method for hindering binder crystallization on functionalized surfaces, leading to reproducible target capture. The results show that cantilever surface treatment is a promising method for achieving a high degree of functionalization reproducibility for industrial cantilever sensors, by controlling binder morphology and uniformity.

Superhydrophobic and superoleophobic poly(3,4-ethylenedioxypyrrole) polymers synthesized using the Staudinger-Vilarrasa reaction

2017 ◽  
Vol 89 (12) ◽  
pp. 1751-1760 ◽  
Author(s):  
Claudio Mortier ◽  
Romain Bourd ◽  
Guilhem Godeau ◽  
Frédéric Guittard ◽  
Thierry Darmanin
Keyword(s):  
Surface Roughness ◽  
Surface Energy ◽  
Surface Properties ◽  
Chain Length ◽  
Industrial Applications ◽  
Polymer Surfaces ◽  
Surface Wettability ◽  
Photovoltaic Systems ◽  
Wetting Properties ◽  
Self Cleaning

AbstractVegetal and animal reigns offer many examples of surfaces with surprising and interesting wetting properties. As example, springtails present superoleophobic properties allowing to live in soil and Lotus leaves show self-cleaning ability even under rainfalls. Indeed, it is known that self-cleaning properties can help to remove dust and particles during rainfalls and as a consequence to clean the surface. The bioinspiration of these surface properties is of a real interest for industrial applications in the nanotechnology field such as photovoltaic systems or anti corrosive material. Here, we use a strategy based on electropolymerization to obtain these properties. The Staudinger-Vilarrasa reaction is used to prepare innovative 3,4-ethylenedioxypyrrole (EDOP) monomers with fluorinated chains. Using C6F13 or C8F17 chains, the polymer surfaces formed after electrodeposition show superhydrophobic and superoleophobic features. Here we study the surface wettability depending on the surface energy (based on the perfluorinated chain length), the surface roughness and morphology.

scholarly journals Integrated MEMS/NEMS Resonant Cantilevers for Ultrasensitive Biological Detection

2009 ◽  
Vol 2009 ◽  
pp. 1-10 ◽  
Author(s):  
Xinxin Li ◽  
Haitao Yu ◽  
Xiaohua Gan ◽  
Xiaoyuan Xia ◽  
Pengcheng Xu ◽  
...  
Keyword(s):  
Great Promise ◽  
Self Assembled Monolayer ◽  
Trace Level ◽  
Microcantilever Sensors ◽  
Cantilever Sensors ◽  
Chinese Academy Of Sciences ◽  
Cantilever Surface ◽  
Volume Production ◽  
Micro Cantilever ◽  
Academy Of Sciences

The paper reviews the recent researches implemented in Chinese Academy of Sciences, with achievements on integrated resonant microcantilever sensors. In the resonant cantilevers, the self-sensing elements and resonance exciting elements are both top-down integrated with silicon micromachining techniques. Quite a lot of effort is focused on optimization of the resonance mode and sensing structure for improvement of sensitivity. On the other hand, to enable the micro-cantilevers specifically sensitive to bio/chemical molecules, sensing materials are developed and modified on the cantilever surface with a self-assembled monolayer (SAM) based bottom-up construction and surface functionalization. To improve the selectivity of the sensors and depress environmental noise, multiple and localized surface modifications are developed. The achieved volume production capability and satisfactory detecting resolution to trace-level biological antigen of alpha-fetoprotein (AFP) give the micro-cantilever sensors a great promise for rapid and high-resoluble detection.

Corrosion and Wear Protection through Micro Arc Oxidation Coatings in Aluminum and Its Alloys

2019 ◽  
Author(s):  
L. Rama Krishna ◽  
G. Sundararajan
Keyword(s):  
Corrosion Resistance ◽  
Surface Properties ◽  
High Hardness ◽  
Basic Mechanism ◽  
Industrial Applications ◽  
Corrosion Properties ◽  
Micro Arc Oxidation ◽  
Coating Formation ◽  
Wear And Corrosion Resistance ◽  
Technological Limitations

This article presents the brief overview of fairly recent and eco-friendly micro arc oxidation (MAO) coating technology. The weight-cost-performance benefits in general raised the interest to utilize lightweight materials, especially the aluminum and its alloys. Despite numerous engineering advantages, the aluminum alloys themselves do not possess suitable tribology and corrosion resistance. Therefore, improvements in surface properties are essential to enable developing potential industrial applications. For improving wear and corrosion resistance of Al alloys, the most demanding surface properties are high hardness and chemical inertness. The technical and technological limitations associated with traditional anodizing and hard anodizing processes have been the strongest driving force behind the development of new MAO technology. While presenting the key technological elements associated with the MAO process, the basic mechanism of coating formation and its phase gradient nature is presented. Influence of various process parameters including the electrolyte composition has been discussed. The typical microstructural features and distribution of α- and γ-Al2O3 phases across the coating thickness as a key strategy to form dense coatings with required mechanical, tribological, and corrosion properties which are vital to meet potential application demands are briefly illustrated.

scholarly journals γ-Nanofluid Thermal Transport between Parallel Plates Suspended by Micro-Cantilever Sensor by Incorporating the Effective Prandtl Model: Applications to Biological and Medical Sciences

Molecules ◽  
2020 ◽  
Vol 25 (8) ◽  
pp. 1777 ◽  
Author(s):  
Umar Khan ◽  
Adnan ◽  
Naveed Ahmed ◽  
Syed Tauseef Mohyud-Din ◽  
Yu-Ming Chu ◽  
...  
Keyword(s):  
Volume Fraction ◽  
High Volume ◽  
Research Area ◽  
Parallel Plates ◽  
Medical Sciences ◽  
Cantilever Sensors ◽  
Prandtl Model ◽  
Cantilever Sensor ◽  
Warfare Agents ◽  
Micro Cantilever

The flow of nanofluid between infinite parallel plates suspended by micro-cantilever sensors is significant. The analysis of such flows is a rich research area due to the variety of applications it has in chemical, biological and medical sciences. Micro-cantilever sensors play a significant role in accurately sensing different diseases, and they can be used to detect many hazardous and bio-warfare agents. Therefore, flow water and ethylene glycol (EG) composed by γ-nanoparticles is used. Firstly, the governing nanofluid model is transformed into two self-similar nanofluid models on the basis of their effective models. Then, a numerical method is adopted for solution purposes, and both the nanofluid models are solved. To enhance the heat transfer characteristics of the models, the effective Prandtl model is ingrained in the energy equation. The velocity F’(η) decreases with respect to the suction of the fluid, because more fluid particles drags on the surface for suction, leading to an abrupt decrement in F’(η). The velocity F’(η) increases for injection of the fluid from the upper end, and therefore the momentum boundary layer region is prolonged. A high volume fraction factor is responsible for the denser characteristics of the nanofluids, due to which the fluids become more viscous, and the velocity F’(η) drops abruptly, with the magnetic parameters favoring velocity F’(η). An increase in temperature β ( η ) of Al2O3-H2O and γAl2O3-C2H6O2 nanofluids was reported at higher fraction factors with permeable parameter effects. Finally, a comparative analysis is presented by restricting the flow parameters, which shows the reliability of the study.

On the micromechanics of micro-cantilever sensors: Property analysis and eigenstrain modeling

2007 ◽  
Vol 139 (1-2) ◽  
pp. 70-77 ◽  
Author(s):  
Alexander M. Korsunsky ◽  
Suman Cherian ◽  
Roberto Raiteri ◽  
Rüdiger Berger
Keyword(s):  
Cantilever Sensors ◽  
Property Analysis ◽  
Micro Cantilever

Effect of Polymer Substrates on Nano Scale Hot Embossing

2003 ◽  
Vol 782 ◽  
Author(s):  
Jin-Hyung Lee ◽  
Hyun-Woo Lim ◽  
Jin-Goo Park ◽  
Eun-Kyu Lee ◽  
Yangsun Kim
Keyword(s):  
Surface Energy ◽  
Surface Properties ◽  
Process Development ◽  
Adhesion Force ◽  
Polymer Surface ◽  
Hot Embossing ◽  
Surface Characteristic ◽  
Direct Writing ◽  
Polymer Substrates ◽  
Nano Size

ABSTRACTHot embossing has been widely accepted as an alternative to photolithography in generating patterns on polymer substrates. The optimization of embossing process should be accomplished based on polymer surface properties. Therefore, in this paper, polymers with different surface characteristic were selected and the surface properties of each polymers such as surface energy and adhesion force were investigated by contact angle and AFM. Based on these results, the imprinted nano patterns were compared. Silicon molds with nano size patterns were fabricated by e-beam direct writing. Molds were coated with self-assembled monolayer (SAM) of (1, 1, 2, 2H –perfluorooctyl)-trichlorosilane to reduce the stiction between molds and polymer substrates. For embossing, pressure of 500 psi, embossing time of 5 min and temperature of above transition temperature were applied. Mr-I 8010 polymer (Micro Resist Technology), Polymethylmethacrylate (PMMA 495k) and LOR (polyaliphatic imide copolymer) were used as substrate for hot embossing process development in nano size. These polymers were spun coated on the Si wafer with the thickness of 150 nm. The nano size patterns obtained by hot embossing were identified by atomic force microscopy without breaking the pattern and compared based on the polymer surface properties. The mr-I 8010 which has the lowest surface energy and adhesion force shows the best demolding property.

Crystallographic anisotropy in surface properties of brass and its dependence on the electron work function

2018 ◽  
Vol 51 (6) ◽  
pp. 1715-1720 ◽  
Author(s):  
Liqiu Guo ◽  
Hao Lu ◽  
D. Y. Li ◽  
Q. X. Huang ◽  
Xu Wang ◽  
...  
Keyword(s):  
Surface Energy ◽  
Work Function ◽  
Surface Properties ◽  
Electron Work Function ◽  
Adhesive Force ◽  
Surface Electron ◽  
Crystallographic Anisotropy ◽  
Atomic Force ◽  
Work Functions ◽  
Crystallographic Planes

The crystallographic anisotropy of the electric current or conductance, adhesive force, elastic modulus, and deformation magnitude of alpha brass were investigated through property mapping using an atomic force microscope. Surface electron work functions of differently oriented grains in the brass were also analyzed using atomic force microscopy. The mapped surface properties are closely related to the electron work function; the work function reflects the surface activity, which is itself dependent on the surface energy. The anisotropy of the properties is closely correlated to the in situ measured surface electron work function. It is demonstrated that crystallographic planes with higher electron work functions exhibit lower current, smaller adhesive forces, larger elastic moduli and smaller deformation magnitudes. Efforts are made to understand the relationships by connecting the properties with surface energy and electron work function. The dependence of the properties on crystallographic orientation can be elucidated by considering the surface electron behavior using electron work function as a novel probing parameter.

Simple and versatile micro‐cantilever sensors

Sensor Review ◽  
2009 ◽  
Vol 29 (1) ◽  
pp. 44-53 ◽  
Author(s):  
Gino Rinaldi ◽  
Muthukumaran Packirisamy ◽  
Ion Stiharu ◽  
Nezih Mrad
Keyword(s):  
Cantilever Sensors ◽  
Micro Cantilever
Sign in / Sign up

Export Citation Format

Share Document