Ultralow friction of graphene-coated silica nanoparticle film

2022 ◽  
Vol 204 ◽  
pp. 111184
Haoxuan Li ◽  
Paulo S. Branicio
Shinya Kano ◽  
Harutaka MEKARU

Abstract We study a proton transport on the surface of insulating nanoparticles for humidity sensors. We use the approach to reveal proton transfer mechanisms in humidity sensitive materials. Hydrophilic and hydrophobic ligand-terminated silica nanoparticle films are adopted for evaluating temperature dependence of the ion conductivity. According to the activation energy of the conductivity, we explain the Grotthuss (H+ transfer) and vehicular (H3O+ transfer) mechanisms are mainly dominant on hydrophilic (-OH terminated) and hydrophobic (acrylate terminated) surface of nanoparticles, respectively. This investigation gives us a clue to understand a proton transfer mechanism in solution-processed humidity-sensitive materials such as oxide nanomaterials.

2019 ◽  
Vol 25 (S2) ◽  
pp. 2008-2009
Joe V Carpenter ◽  
Shannon Poges ◽  
Zachary C Holman

2012 ◽  
Vol 171-172 ◽  
pp. 343-349 ◽  
Masaharu Kameda ◽  
Hitoshi Seki ◽  
Taro Makoshi ◽  
Yutaka Amao ◽  
Kazuyuki Nakakita

Sensors ◽  
2020 ◽  
Vol 20 (14) ◽  
pp. 3858
Shinya Kano ◽  
Harutaka Mekaru

Fast-response humidity sensors using nanomaterials are attractive and have been intensively studied. Among the various nanomaterials, nonporous inorganic nanoparticles are suitable for use in humidity sensitive films for sensors. Here, we focus on a nonporous inorganic nanoparticle film and investigate a humidity sensor using the film. Hysteresis error and a dynamic response to a change of humidity are fundamental specifications of humidity sensors. A humidity sensor using a 50 nm silica nanoparticle film shows a hysteresis error of 2% at 85% RH and a response/recovery time of 2.8/2.3 s in 30% RH to 70% RH. We also summarize response/recovery times and hysteresis errors of state-of-the-art humidity sensors. As compared to those of commercial sensors and porous nanoparticle-based sensors evaluated using saturated salt solutions, the fabricated sensor shows a comparative hysteresis error and shorter response time.

2012 ◽  
Vol 488-489 ◽  
pp. 1525-1529
Arjaree Pradittham ◽  
Supapen Trejitwattanaku ◽  
Titima Sramanee ◽  
Sarinthip Thanakkasaranee ◽  
Duangduen Atong ◽  

Nanocomposite films based on liner low density polyethylene (LLDPE), containing of 1 phr silica nanoparticle and 1, 3 and 5 %wt triethoxyvinylsilane as a new coupling were prepared and characterized using FTIR tests, scanning electron microscopy, tensile tests, oxygen and water vapor permeation measurements. Optimization of the technology involved in production of an exfoliated nanocompound is a complex process in which multiple variables and parameters are involved. The results of the study showed that the feed position of the nanoparticle in the double screw extruder is of vital importance in obtaining an exfoliated film. The maximum triethoxyvinylsilane used in the extruder was 3 %wt, for LLDPE/modified silica nanoparticle. There was no exfoliation or intercalation of the silica particle in the absence of triethoxyvinylsilane. The oxygen barrier properties of the LLDPE/modified silica nanoparticle film were significantly better than those of the LDPE/silica nanoparticle film. In addition to barrier properties, the LLDPE/silica/3%TEVS film also had better Young’s modulus and tensile strength than their counterparts without triethoxyvinylsilane.

2016 ◽  
Vol 376 ◽  
pp. 62-68
Wooyoung Shim ◽  
Seung Yun Lee ◽  
Hyo-Sop Kim ◽  
Jae-Ho Kim

2020 ◽  
Vol 16 (5) ◽  
pp. 748-756
Mir Waqas Alam ◽  
Tentu Nageswara Rao ◽  
Yarasani Prashanthi ◽  
Vourse Sridhar ◽  
Adil Alshoaibi ◽  

Background: Herbicides are very beneficial in the crop yield with the aid of controlling weeds within the agriculture, but several herbicides are chronic in soil. Objective: In this study, nanoparticles and the packages of synthesized novel silica nanoparticles were studied for the preconcentration of herbicides. Methods: These nanoparticles prepared by the Stöber mechanism were purified and functionalized. Nanoparticles thus prepared successfully were used as supporting material for the preconcentration of residues of herbicides in the water. Results: Preconcentration was achieved by preparing the silica-based solid-phase-extraction cartridges. Nanoparticles used for this purpose were within the range of 50-250 nm. An SPE cartridge was prepared by packing 200 mg of silica nanoparticle in the empty cartridge of diameter 5.5 cm and length 0.6 cm in between PTFE frits. Aqueous solutions of 0.1 μg/ml of herbicides were prepared separately, and 10 ml of the solution was passed through the cartridge at the rate of 0.2 ml/min. After passing 10 ml volume of the aqueous solution, residues adsorbed on the cartridge were eluted using 2 ml of acetonitrile. The eluate was injected to determine the herbicide residue adsorbed on the SPE cartridge. Conclusion: In the study, it was found that greater than 90% of the herbicide residues were trapped on silica nanoparticle-based SPE cartridge. An analytical method was developed for the simultaneous determination of these herbicides. The residues were quantified by LC-MS/MS with ESI mode.

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