scholarly journals Coupled Superhydrophilic PMMA Film with Inverted Pyramid Microstructures for Antireflection and Antifogging Properties

Coatings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1107
Author(s):  
Xiaoming Feng ◽  
Guizhong Tian ◽  
Shichao Niu ◽  
Honggen Zhou
Keyword(s):  
Sio2 Nanoparticles ◽  
Optical Devices ◽  
Silica Sol ◽  
Pmma Film ◽  
Transfer Printing ◽  
Pmma Substrate ◽  
Practical Applications ◽  
Performance Loss ◽  
Inverted Pyramid ◽  
Pmma Surface

Transparent substrates with antifogging and antireflection ability are of extreme significance for optical devices, because they alleviate performance loss and maintenance costs. Here, we reported that a multifunctional film, with excellent mechanical properties, can be fabricated on the PMMA surface via the micro-transfer printing method. In particular, the synergistic effect of the inverted pyramid microstructure and SiO2 nanoparticles gives the film excellent antireflective, superhydrophilic and antifogging properties, and the silica sol firmly adheres to the PMMA substrate via the silane coupling agent, which exhibits an encouraging prospect of practical applications from lenses for personal and sports eyewear to transparent displays and sensors, etc.

scholarly journals Robust Conductive Hydrogels with Ultrafast Self-Recovery and Nearly Zero Response Hysteresis for Epidermal Sensors

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1854
Author(s):  
Xiuru Xu ◽  
Chubin He ◽  
Feng Luo ◽  
Hao Wang ◽  
Zhengchun Peng
Keyword(s):  
Guar Gum ◽  
Strain Range ◽  
Sio2 Nanoparticles ◽  
Fast Response ◽  
Gauge Factor ◽  
Practical Applications ◽  
Hydroxypropyl Guar ◽  
Stable Chemical ◽  
Conductive Hydrogel ◽  
Conductive Hydrogels

Robust conductive hydrogels are in great demand for the practical applications of smart soft robots, epidermal electronics, and human–machine interactions. We successfully prepared nanoparticles enhanced polyacrylamide/hydroxypropyl guar gum/acryloyl-grafted chitosan quaternary ammonium salt/calcium ions/SiO2 nanoparticles (PHC/Ca2+/SiO2 NPs) conductive hydrogels. Owing to the stable chemical and physical hybrid crosslinking networks and reversible non-covalent interactions, the PHC/Ca2+/SiO2 NPs conductive hydrogel showed good conductivity (~3.39 S/m), excellent toughness (6.71 MJ/m3), high stretchability (2256%), fast self-recovery (80% within 10 s, and 100% within 30 s), and good fatigue resistance. The maximum gauge factor as high as 66.99 was obtained, with a wide detectable strain range (from 0.25% to 500% strain), the fast response (25.00 ms) and recovery time (86.12 ms), excellent negligible response hysteresis, and good response stability. The applications of monitoring the human’s body movements were demonstrated, such as wrist bending and pulse tracking.

scholarly journals Modelling of new generation plasma optical devices

Nukleonika ◽  
2016 ◽  
Vol 61 (2) ◽  
pp. 207-212 ◽  
Author(s):  
Irina V. Litovko ◽  
Alexy A. Goncharov ◽  
Andrew N. Dobrovolskiy ◽  
Lily V. Naiko ◽  
Irina V. Naiko
Keyword(s):  
Low Cost ◽  
Rocket Engine ◽  
Cost Effective ◽  
Optical Devices ◽  
High Tech ◽  
Practical Applications ◽  
Plasma Accelerators ◽  
New Generation ◽  
Closed Electron ◽  
Positive Space

Abstract The paper presents new generation plasma optical devices based on the electrostatic plasma lens configuration that opens a novel attractive possibility for effective high-tech practical applications. Original approaches to use of plasma accelerators with closed electron drift and open walls for the creation of a cost-effective low-maintenance plasma lens with positive space charge and possible application for low-cost, low-energy rocket engine are described. The preliminary experimental, theoretical and simulation results are presented. It is noted that the presented plasma devices are attractive for many different applications in the state-of-the-art vacuum-plasma processing.

Dam ageing diagnosis and risk analysis: Development of methods to support expert judgment

2006 ◽  
Vol 43 (2) ◽  
pp. 169-186 ◽  
Author(s):  
Laurent Peyras ◽  
Paul Royet ◽  
Daniel Boissier
Keyword(s):  
Risk Analysis ◽  
Functional Model ◽  
Physical Modelling ◽  
Graph Representation ◽  
Effect Analysis ◽  
Practical Applications ◽  
Knowledge Database ◽  
Performance Loss ◽  
Dam Stability ◽  
Fmea Method

Diagnosis and risk analysis are essential to ensure the safety of dams. Dam specialist engineers have useful methods available to help them in their task: physical modelling for assessing dam stability, statistical analysis of dam monitoring data, and, more recently, functional modelling for operational safety analysis. However, an expert's judgment is necessary when the works are complex and unique, when data are imprecise or insufficient, and when preliminary diagnosis or detailed analysis are being made. Using their experience and knowledge, dam specialist engineers are able to provide recommendations to address specific problems. The authors propose methods to support expert diagnosis and risk analysis that capitalize on the expert's knowledge and feedback. Their approach is threefold: (i) an ageing functional model based on the failure mode and effect analysis (FMEA) method using a causal graph representation of ageing scenarios leading to loss of functions; (ii) a qualitative method of describing dam ageing historical data and representing trends in performance loss; and (iii) qualitative methods to assess the risk of performance loss of dams and their components. In terms of practical applications, our research has produced a knowledge database on dam mechanisms. Also, an ageing historical database was compiled from dams that have experienced deterioration. Finally, we are developing computer aids to assist engineers in diagnosis and risk analysis tasks.Key words: dam, diagnosis, risk analysis, ageing, criticality.

scholarly journals Synthesis and Photochromic Properties of Conjugated Naphthopyran Derivatives

2018 ◽  
Vol 42 (9) ◽  
pp. 447-452
Author(s):  
Qian Zhao ◽  
Yanhua Yang ◽  
Kecheng Shen ◽  
Xian Tao ◽  
Yingzhong Shen
Keyword(s):  
Maximum Absorption ◽  
Side Chain ◽  
Pmma Film ◽  
Photochromic Properties ◽  
Dichloromethane Solution ◽  
Practical Applications ◽  
Thermal Bleaching ◽  
Solid Film ◽  
Maximum Absorption Wavelength ◽  
Bleaching Rate

Three novel types of naphthopyran derivatives containing alkoxyl and phenyl moieties, 13-butyl −6,11-dimethyl-3,3-diphenyl-3,13-dihydrobenzo[h]indeno[2,1-f]chromen-13-ol (NP), 13-butyl-3,3-bis(6-methoxy-[1,1′-biphenyl]-3-yl)-6,6-dimethyl-3,13-dihydrobenzo[h] indeno[2,1-f]chromen-13-ol (NP1) and 13-butyl-3,3-bis(6-methoxy-4′-naphthalenyl-[1,1′-biphenyl]-3-yl)-6,11-dimenthyl-3,13-dihydrobenz[h]indeno[2,1-f]chromen-13-ol (NP2), were synthesised and characterised. Measurements indicated that they possessed an excellent photochromic response, a rapid thermal bleaching rate and good fatigue resistance. Meanwhile, the UV maximum absorption wavelengths of NP1 (562 nm) and NP2 (597 nm) appeared bathochromically shifted compared with NP (536 nm). The bleaching rate of NP1 was found to be approximately twice that of NP. The results indicated that the UV maximum absorption wavelength and bleaching rate increase with increasing length of the phenyl side chain moieties. In PMMA film, the compounds showed almost the same photochromic properties in the solid state as in dichloromethane solution. The UV absorbance with high-contrast switching in solid film could be beneficial for practical applications.

scholarly journals Geckoprinting: assembly of microelectronic devices on unconventional surfaces by transfer printing with isolated gecko setal arrays

2014 ◽  
Vol 11 (99) ◽  
pp. 20140627 ◽  
Author(s):  
Jaeyoung Jeong ◽  
Juho Kim ◽  
Kwangsun Song ◽  
Kellar Autumn ◽  
Jongho Lee
Keyword(s):  
High Pressure ◽  
Semiconductor Materials ◽  
Proof Of Concept ◽  
Transfer Printing ◽  
Practical Applications ◽  
Microelectronic Devices ◽  
Pick And Place ◽  
Integrated Or

Developing electronics in unconventional forms provides opportunities to expand the use of electronics in diverse applications including bio-integrated or implanted electronics. One of the key challenges lies in integrating semiconductor microdevices onto unconventional substrates without glue, high pressure or temperature that may cause damage to microdevices, substrates or interfaces. This paper describes a solution based on natural gecko setal arrays that switch adhesion mechanically on and off, enabling pick and place manipulation of thin microscale semiconductor materials onto diverse surfaces including plants and insects whose surfaces are usually rough and irregular. A demonstration of functional ‘geckoprinted’ microelectronic devices provides a proof of concept of our results in practical applications.

Preparation of a novel superhydrophobic PMMA surface with nanostructure and its blood compatibility

e-Polymers ◽  
2012 ◽  
Vol 12 (1) ◽  
Author(s):  
Xiaobo Wang ◽  
Ningbo Yang ◽  
Qi Xu ◽  
Chun Mao ◽  
Xiaomei Hou ◽  
...  
Keyword(s):  
Blood Compatibility ◽  
Platelet Rich Plasma ◽  
Surface Group ◽  
Pmma Film ◽  
Selective Solvent ◽  
Water Contact ◽  
Human Whole Blood ◽  
Application Range ◽  
Pmma Surface ◽  
Better Than

AbstractSuperhydrophobic poly(methylmethacrylate) (PMMA) surface with nanostructure was prepared effectively via phase separation and selective solvent method. It is proposed that the cooperation of the nanostructure of PMMA surface and the surface group reorientation leads to the superhydrophobicity of PMMA surface. The superhydrophobic PMMA surface with nanostructure was characterized by scanning electron microscope (SEM) and water contact angle (WCA) measurements. The blood compatibility of the superhydrophobic PMMA surface with nanostructure was evaluated by platelet-rich plasma (PRP) and fresh human whole blood contacting experiments using pure flat PMMA film as the control. These two experiments demonstrated that blood compatibility of the superhydrophobic PMMA surface with nanostructure is better than that of the pure flat PMMA film. The significance of this research lies in that it will greatly broaden the application range of materials that can be used as biomaterials by fabrication of superhydrophobic surfaces.

scholarly journals Nano-SiO2 used with cationic polymer to improve the strength of sack paper

BioResources ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 3348-3359
Author(s):  
Jiawei Yang ◽  
Liulian Huang ◽  
Yonghao Ni ◽  
Lihui Chen ◽  
Qingxian Miao
Keyword(s):  
Photoelectron Spectroscopy ◽  
Sio2 Nanoparticles ◽  
Strength Properties ◽  
Packaging Material ◽  
Cationic Polymer ◽  
Attenuated Total Reflection ◽  
X Ray ◽  
Physical Strength ◽  
Practical Applications ◽  
Diallyldimethylammonium Chloride

As a green and sustainable packaging material, industrial sack paper has gained increased attention in recent years due to the public’s heightened environmental awareness. Practical applications for industrial packaging sack paper demands that the paper possess high physical strength properties. In this study, silicon dioxide (SiO2) nanoparticles in conjunction with poly(diallyldimethylammonium chloride) (PDADMAC) were applied to improve the physical strength of sack paper. The results showed that the physical strength properties of the sack paper increased with the addition of the SiO2 nanoparticles and PDADMAC, while the air permeability of the paper also remained high. Attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) were used to characterize the sack paper with the SiO2 nanoparticle filler.

Research on the Application of Liquid Permeating Method to Silica Sol Stability

2013 ◽  
Vol 539 ◽  
pp. 266-270
Author(s):  
Le Li ◽  
Nai Zhou ◽  
Xu Cui ◽  
Wen Hai Huang
Keyword(s):  
Measurement Method ◽  
Reliable Method ◽  
Low Cost ◽  
Silica Sol ◽  
New Method ◽  
Gel Time ◽  
Time Saving ◽  
Practical Applications ◽  
The Stability ◽  
Sol Stability

The stability of SiO2 sol is an important parameter in the practical applications. But so far the parameter for expressing the stability of SiO2 sol cannot be characterized by a proper measurement. In this paper, a new method, liquid permeating method, was introduced, by which the stability of SiO2 sol was characterized and the effects of additive, such as dimethylformamide (DMF) and MgO were presented. The results show that with the amount of DMF increasing, the gel-time of SiO2 sol became longer; and that with the amount of MgO increasing, the gel-time became shorter. The results obtained by this new method are as same as that from the traditional tedious viscometer measurement method, which indicate that this liquid permeating method is a reliable method for characterizing the stability of SiO2 sol. Besides, this liquid permeating method is also simple, time-saving and low-cost for evaluating SiO2 sol stability.

scholarly journals Improving Stability and Colloidal Dispersity of CsPbBr3@SiO2 Nanoparticles Based on In-Situ Synthesis in Entropy Ligands Functionalized SiO2 Nanoreactor

Crystals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1165
Author(s):  
Tianju Chen ◽  
Peng Zhang ◽  
Guoliang Chen ◽  
Qi Yang ◽  
Feiming Li
Keyword(s):  
Sio2 Nanoparticles ◽  
Structural Instability ◽  
In Situ Synthesis ◽  
Grand Challenge ◽  
Polar Solvents ◽  
Practical Applications ◽  
The Past ◽  
New Strategy ◽  
The Stability

Perovskite nanocrystals (PNCs) have witnessed unprecedented development in optoelectronic fields over the past few years. However, their intrinsic ionic structural instability still dramatically hinders their practical applications. Reliably improving the stability of PNCs while retaining their colloidal dispersity remains a grand challenge. Herein, we report a new strategy whereby CsPbBr3 nanoparticles are grown in situ in an entropy ligand-functionalized SiO2 nanoreactor. Consequently, the as-obtained CsPbBr3@SiO2 NPs show outstanding stability and colloidal dispersity in various non-polar solvents and have good solution processability, which are unattainable by conventional template-assisted methods.

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