Creep Compensation in an Electrostatic PDMS-Membrane Actuator with Flexible Silver Nanowire Electrodes

An electrostatic membrane actuator with an elastomer membrane as movable part and silver nanowires (AgNWs) as flexible electrode material is built and characterized. A layered and modular actuator design facilitates simple and fast modification of actuator properties for characterization purposes. The tested actuators allow a membrane center deflection in the range of over 50 μm with applied voltages lower than 1 kV. The observable membrane center deflection exhibits a viscoelastic creep behavior. With the aim to achieve a more stable membrane deflection, a simple correction function was applied to the constant electrode voltage thus compensating the linear creep rate. With this method, the creep rate was changed from +0.27 μm/s to −0.08 μm/s. This method already improves the stability of the actuator deflection to a high degree.

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Roll-to-roll printed silver nanowires for increased stability of flexible ITO-free organic solar cell modules

Nanoscale ◽

10.1039/c5nr07426f ◽

2016 ◽

Vol 8 (1) ◽

pp. 318-326 ◽

Cited By ~ 67

Author(s):

Gisele A. dos Reis Benatto ◽

Bérenger Roth ◽

Michael Corazza ◽

Roar R. Søndergaard ◽

Suren A. Gevorgyan ◽

...

Keyword(s):

Solar Cell ◽

Organic Solar Cell ◽

Silver Nanowires ◽

Silver Nanowire ◽

Test Results ◽

Roll To Roll ◽

Front Electrode ◽

Cell Modules ◽

The Stability ◽

Nanowire Networks

We report the stability test results of ITO-free OPV modules using roll-to-roll printed silver nanowire networks as front electrode.

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Atmospherically Stable Silver Nanowire/Hydroxyethyl Cellulose Films and their Application in Flexible Transparent Touch Screen

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.821.401 ◽

2019 ◽

Vol 821 ◽

pp. 401-406 ◽

Cited By ~ 1

Author(s):

Nathaniel De Guzman ◽

Mary Donnabelle L. Balela

Keyword(s):

Indium Tin Oxide ◽

Silver Nanowires ◽

Touch Screen ◽

Silver Nanowire ◽

Hydroxyethyl Cellulose ◽

Protective Agent ◽

Ambient Conditions ◽

Suitable Material ◽

Cellulose Films ◽

The Stability

Silver nanowires (AgNWs) has been extensively studied to replace indium tin oxide as a suitable material for transparent conducting films (TCEs) The networks of nanowires however are prone to degradation due to corrosion when exposed to ambient conditions. In this study, high aspect ratio AgNWs were synthesized with an improved polyol method by varying the reaction temperatures in the nucleation and growth stage. Solutions of AgNWs were deposited on polymer substrates and were exposed to ambient laboratory conditions for several days and the effect on the stability and overall performance of the AgNW films was investigated. Morphological and elemental analysis of the exposed films was done using SEM and EDX, respectively. Hydroxyethyl cellulose (HEC) was introduced as a polymeric binder and protective agent in order to prevent the exposure of the AgNW surface to corrosive agents in air. A TCE with a sheet resistance of 47.50 Ω/sq and transmittance of 89.70% at 550 nm without any harsh post-treatments, was demonstrated. These electrodes were used to fabricate a transparent flexible touch screen.

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Silver nanowire coated knitted wool fabrics for wearable electronic applications

Journal of Engineered Fibers and Fabrics ◽

10.1177/1558925019856222 ◽

2019 ◽

Vol 14 ◽

pp. 155892501985622 ◽

Cited By ~ 1

Author(s):

Alper Gurarslan ◽

Büşra Özdemir ◽

İbrahim Halil Bayat ◽

Mustafa Berke Yelten ◽

Güneş Karabulut Kurt

Keyword(s):

Electronic Properties ◽

Pressure Sensor ◽

Dielectric Material ◽

Silver Nanowires ◽

Silver Nanowire ◽

Electronic Textiles ◽

Flexible Electrode ◽

Wool Fabrics ◽

Wool Fibers ◽

Wearable Electronic

This study demonstrates a first example of silver nanowire coated wool fibers for wearable electronic applications. Silver nanowires were synthesized according to the polyol method and then drop casted on knitted wool fabrics. Electronic properties of the knitted samples were investigated under cyclic bending conditions. Conductive fabrics were isolated with a dielectric material and used as capacitance to measure respiration and finger motions. In addition, the same capacitor was employed as a pressure sensor and touch-based sensor for lighting up an LED. This study demonstrates that silver nanowire coated knitted wool fabrics can be used in electronic textiles not only as a flexible electrode but also as a capacitor for different applications.

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Silver Nanowire Networks: Silver Nanowires Network Film with Enhanced Crystallinity toward Mechano‐Electrically Sustainable Flexible‐Electrode (Adv. Mater. Technol. 1/2021)

Advanced Materials Technologies ◽

10.1002/admt.202170001 ◽

2021 ◽

Vol 6 (1) ◽

pp. 2170001

Author(s):

Mi‐Jeong Kim ◽

Dong‐Su Ko ◽

Jung‐Hwa Kim ◽

Eun‐Hyoung Cho ◽

Dae Jin Yang ◽

...

Keyword(s):

Silver Nanowires ◽

Silver Nanowire ◽

Flexible Electrode ◽

Nanowire Networks ◽

Enhanced Crystallinity

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METHODS FOR RESTORING WOLVES OF ROLLING PRODUCTION

Tekhnicheskiy servis mashin ◽

10.22314/2618-8287-2020-58-4-114-122 ◽

2020 ◽

Vol 4 (141) ◽

pp. 114-122

Author(s):

DAR’YA LEBEDEVA ◽

◽

ANNA KARPUNICHEVA

Keyword(s):

Thermal Effects ◽

Machine Building ◽

Research Purpose ◽

Technical Literature ◽

Production Methods ◽

Advantages And Disadvantages ◽

Rolling Production ◽

Machine Parts ◽

The Stability ◽

High Degree

Large forces and significant thermal effects are created on the rolls when rolling sheets. The higher the stability of the rolls, the less downtime during their rerolling and higher productivity. (Research purpose) The research purpose is in analyzing the ways of restoring rolls and choose the most appropriate method for restoring these parts. (Materials and methods) The article presents the analysis of the scientific and technical literature on the topic of rolling production, methods for restoring large-sized machine parts of machine-building and metallurgical industries that work in difficult conditions and are subject to a high degree of wear. Authors try to solve the problem by means of comparative and logical analysis based on theoretical and empirical methods of scientific research. (Results and discussion) The article presents two groups of methods for restoring rolled rolls: banding and surfacing the working layer of the roll. Authors have analyzed each method in terms of technology, equipment, and feasibility. The article presents the advantages and disadvantages of the methods under consideration. (Conclusions) The most acceptable way to restore parts with a high degree of wear is surfacing. It is most efficient to apply submerged surfacing using an additional hot additive. Such surfacing, despite some complication of the equipment design, allows to deposit the metal on the roll with low heat input and in most cases in one pass. Surfacing using an additional hot additive allows to increase the productivity of the process by up to 250 percent while reducing the penetration depth by 2-3 times and saving energy by up to 40 percent.

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Recycling silver nanoparticle debris from laser ablation of silver nanowire in liquid media toward minimum material waste

Scientific Reports ◽

10.1038/s41598-021-81692-9 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

June Sik Hwang ◽

Jong-Eun Park ◽

Gun Woo Kim ◽

Hyeono Nam ◽

Sangseok Yu ◽

...

Keyword(s):

Laser Ablation ◽

Silver Nanoparticle ◽

Building Materials ◽

Raw Materials ◽

Silver Nanowires ◽

Silver Nanowire ◽

Liquid Media ◽

Ag Nps ◽

Laser Patterning ◽

Inexpensive Procedure

AbstractAs silver nanowires (Ag NWs) are usually manufactured by chemical synthesis, a patterning process is needed to use them as functional devices. Pulsed laser ablation is a promising Ag NW patterning process because it is a simple and inexpensive procedure. However, this process has a disadvantage in that target materials are wasted owing to the subtractive nature of the process involving the removal of unnecessary materials, and large quantities of raw materials are required. In this study, we report a minimum-waste laser patterning process utilizing silver nanoparticle (Ag NP) debris obtained through laser ablation of Ag NWs in liquid media. Since the generated Ag NPs can be used for several applications, wastage of Ag NWs, which is inevitable in conventional laser patterning processes, is dramatically reduced. In addition, electrophoretic deposition of the recycled Ag NPs onto non-ablated Ag NWs allows easy fabrication of junction-enhanced Ag NWs from the deposited Ag NPs. The unique advantage of this method lies in using recycled Ag NPs as building materials, eliminating the additional cost of junction welding Ag NWs. These fabricated Ag NW substrates could be utilized as transparent heaters and stretchable TCEs, thereby validating the effectiveness of the proposed process.

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Effects of Concentration and Spin Speed on the Optical and Electrical Properties of Silver Nanowire Transparent Electrodes

Materials ◽

10.3390/ma14092219 ◽

2021 ◽

Vol 14 (9) ◽

pp. 2219

Author(s):

Xiaopeng Li ◽

Jiayue Zhou ◽

Dejun Yan ◽

Yong Peng ◽

Yong Wang ◽

...

Keyword(s):

Sheet Resistance ◽

Spin Coating ◽

Figure Of Merit ◽

Silver Nanowires ◽

Solution Concentration ◽

Ethanol Solution ◽

Silver Nanowire ◽

Optical And Electrical Properties ◽

Transparent Electrodes ◽

Spin Speed

In this paper, silver nanowires (AgNWs) with a diameter of 40 nm and a length of 45 μm were dispersed into an ethanol solution to prepare AgNW solutions with concentrations of 1, 2, and 3 mg/mL, respectively. The AgNW solutions were then deposited on a glass substrate using spin-coating at 1000, 2000, and 3000 rpm for 45 s, respectively, to prepare transparent electrodes. The results showed that the distribution of AgNWs on the substrate increased in density with the increase in the AgNW solution concentration and the decrease in spin speed. The effect of concentration on the distribution of AgNWs was greater than that of the spin speed. The transmittance of each electrode was between 84.19% and 88.12% at 550 nm, the average sheet resistance was between 20.09 and 358.11 Ω/sq, the highest figure of merit (FoM) was 104.42, and the lowest haze value was 1.48%. The electrode prepared at 1000 rpm with a concentration of 2 mg/mL and that prepared at 3000 rpm with a concentration of 3 mg/mL were very similar in terms of the average sheet resistance, transmittance at 550 nm, FoM, and haze value; thus, these two electrodes could be considered equivalent. The haze value of the electrode was positively correlated with the spin speed at low concentration, but that relationship became inverse as the concentration rose. For the AgNWs used in this experiment with an aspect ratio of 1125, the concentration of the AgNW solution should reach at least 2 mg/mL to ensure that the FoM of the electrode is greater than 35.

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Corneal topography and classical test in the diagnosis of dry eye syndrome in patients with myopia and myopic astigmatism before keratorefractive surgery

Modern technologies in ophtalmology ◽

10.25276/2312-4911-2021-1-39-43 ◽

2021 ◽

pp. 39-43

Author(s):

Y.V. Kutuzova ◽

◽

I.V. Dutchin ◽

E.L. Sorokin ◽

◽

...

Keyword(s):

Dry Eye ◽

Tear Film ◽

Risk Groups ◽

Corneal Topography ◽

Dry Eye Syndrome ◽

Film Rupture ◽

Keratorefractive Surgery ◽

The Stability ◽

High Degree ◽

Myopic Astigmatism

Purpose.To conduct a comparative analysis of the effectiveness of assessing the stability of the tear film using corneotopography and the classic Norn test in patients with myopia and myopic astigmatism before keratorefractive surgery. Material and methods. The study included 26 patients planned for keratorefractive surgery for myopia and myopic astigmatism, aged 18 to 47 years. 7 people there was a mild degree of myopia, in 14 people – medium degree, in 5 people – high degree. The average degree of corneal astigmatism was 2.25 diopters. The stability of the pre-corneal tear film was assessed using computed keratotopography and Norn's test – the tear film rupture time (TFRT) was deter- mined. A standard questionnaire was also used to assess the severity of symptoms of dry eye syndrome. A comparison was made of the indicators of the stability of the tear film obtained by the methods of corneotopography and the Norn's test, with their subsequent comparison with the data of the questionnaire. Results. In 17 patients (65.4%), the TFRT index corresponded to the age norm. In the remaining 9 people (34.6%), indicators of stability of the tear film were reduced both by corneotopography (12±4 sec) and by Norn's test (13.5±4.5 sec), and there were also subjective signs of dry eye syndrome according to data questionnaire. The data turned out to be comparable. Conclusions. 1. Among the total population of patients, 34.6% were persons with impaired tear film stability and subjective manifestations of dry eye syndrome. 2. Assessment of the stability of the tear film, determined using the method of corneal topography, showed a high degree of comparability with the results of Norn's test. A significant advantage of the keratotopography method is its non-invasiveness. 3. It is necessary to pay attention to the condition of the ocular surface and identify risk groups to avoid chronicity or aggravation of existing disorders. Key words: dry eye syndrome, tear film, keratotopography, Norn's test.

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Highly flexible and transparent dielectric elastomer actuators using silver nanowire and carbon nanotube hybrid electrodes

Soft Matter ◽

10.1039/c7sm01329a ◽

2017 ◽

Vol 13 (37) ◽

pp. 6390-6395 ◽

Cited By ~ 17

Author(s):

Ye Rim Lee ◽

Hyungho Kwon ◽

Do Hoon Lee ◽

Byung Yang Lee

Keyword(s):

Carbon Nanotubes ◽

Carbon Nanotube ◽

Silver Nanowires ◽

Dielectric Elastomer ◽

Silver Nanowire ◽

Dielectric Elastomer Actuator ◽

Dielectric Elastomer Actuators ◽

Transparent Dielectric ◽

Optically Transparent ◽

Highly Stretchable

Electrodes consisting of silver nanowires and carbon nanotubes enable a dielectric elastomer actuator to become highly stretchable and optically transparent.

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