Sustainable highly charged C60-functionalized Polyimide in non-contact mode triboelectric nanogenerator

2021 ◽  
Author(s):  
Jae Won Lee ◽  
Sungwoo Jung ◽  
Jinhyung Jo ◽  
Gi Hyeon Han ◽  
Dong-Min Lee ◽  
...  
Keyword(s):  
Triboelectric Nanogenerator ◽  
Contact Mode ◽  
Polymer Backbone ◽  
Pendent Groups

In this paper, we report on a new dielectric, a C60‐containing block polyimide (PI–b–C60). This was realized by introducing C60 as pendent groups into a polymer backbone. When this dielectric...

Quantitative Measurements of Vibration Amplitude Using a Contact-Mode Freestanding Triboelectric Nanogenerator

ACS Nano ◽  
2014 ◽  
Vol 8 (12) ◽  
pp. 12004-12013 ◽  
Author(s):  
Sihong Wang ◽  
Simiao Niu ◽  
Jin Yang ◽  
Long Lin ◽  
Zhong Lin Wang
Keyword(s):  
Vibration Amplitude ◽  
Triboelectric Nanogenerator ◽  
Contact Mode ◽  
Quantitative Measurements

scholarly journals A Contact-Mode Triboelectric Nanogenerator for Energy Harvesting from Marine Pipe Vibrations

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1514
Author(s):  
Rui Li ◽  
He Zhang ◽  
Li Wang ◽  
Guohua Liu
Keyword(s):  
Energy Harvesting ◽  
Dielectric Material ◽  
Mechanical Energy ◽  
Experimental Tests ◽  
Electrical Energy ◽  
Underlying Mechanism ◽  
Triboelectric Nanogenerator ◽  
Contact Mode ◽  
Output Performance ◽  
Ocean Environment

Structural health monitoring is of great significance to ensure the safety of marine pipes, while powering the required monitoring sensors remains a problem because the ocean environment is not amenable to the traditional ways of providing an external power supply. However, mechanical energy due to the vortex-induced vibration of pipelines may be harvested to power those sensors, which is a convenient, economic and environmentally friendly way. We here exploit a contact-separation mode triboelectric nanogenerator (TENG) to create an efficient energy harvester to transform the mechanical energy of vibrating pipes into electrical energy. The TENG device is composed of a tribo-pair of dielectric material films that is connected to a mass-spring base to guarantee the contact-separation motions of the tribo-pair. Experimental tests are conducted to demonstrate the output performance and long-term durability of the TENG device by attaching it to a sample pipe. A theoretical model for the energy harvesting system is developed for predicting the electrical output performance of the device. It is established that the normalized output power depends only on two compound variables with all typical factors taken into consideration simultaneously. The simple scale law is useful to reveal the underlying mechanism of the device and can guideline the optimization of the device based on multi-parameters analyses. The results here may provide references for designing contact-mode TENG energy harvesting devices based on the vibration of marine pipes and similar structures.

Test bed for contact-mode triboelectric nanogenerator

2018 ◽  
Vol 89 (6) ◽  
pp. 065110 ◽  
Author(s):  
Daewoong Hong ◽  
Young-Man Choi ◽  
Jaehwa Jeong
Keyword(s):  
Triboelectric Nanogenerator ◽  
Test Bed ◽  
Contact Mode

Surface roughness measurements of vanadium-contaminated fluidized cracking catalysts by atomic force microscopy

1996 ◽  
Vol 54 ◽  
pp. 866-867
Author(s):  
H. Kinney ◽  
M.L. Occelli ◽  
S.A.C. Gould
Keyword(s):  
Surface Roughness ◽  
Zeolite Y ◽  
Atomic Level ◽  
Microporous Structure ◽  
Contact Mode ◽  
Force Microscopy ◽  
Atomic Force ◽  
Before And After ◽  
Roughness Measurements ◽  
Cracking Catalysts

For this study we have used a contact mode atomic force microscope (AFM) to study to topography of fluidized cracking catalysts (FCC), before and after contamination with 5% vanadium. We selected the AFM because of its ability to well characterize the surface roughness of materials down to the atomic level. It is believed that the cracking in the FCCs occurs mainly on the catalysts top 10-15 μm suggesting that the surface corrugation could play a key role in the FCCs microactivity properties. To test this hypothesis, we chose vanadium as a contaminate because this metal is capable of irreversibly destroying the FCC crystallinity as well as it microporous structure. In addition, we wanted to examine the extent to which steaming affects the vanadium contaminated FCC. Using the AFM, we measured the surface roughness of FCCs, before and after contamination and after steaming.We obtained our FCC (GRZ-1) from Davison. The FCC is generated so that it contains and estimated 35% rare earth exchaged zeolite Y, 50% kaolin and 15% binder.

Response Rates in Online Surveys With Affective Disorder Participants

2020 ◽  
Vol 228 (1) ◽  
pp. 14-24 ◽  
Author(s):  
Tanja Burgard ◽  
Michael Bošnjak ◽  
Nadine Wedderhoff
Keyword(s):  
Meta Analysis ◽  
Response Rates ◽  
Contact Mode ◽  
General Anxiety Disorder ◽  
General Anxiety ◽  
Face To Face ◽  
Survey Participation ◽  
The Mean ◽  
Design Characteristics ◽  
E Mail

Abstract. A meta-analysis was performed to determine whether response rates to online psychology surveys have decreased over time and the effect of specific design characteristics (contact mode, burden of participation, and incentives) on response rates. The meta-analysis is restricted to samples of adults with depression or general anxiety disorder. Time and study design effects are tested using mixed-effects meta-regressions as implemented in the metafor package in R. The mean response rate of the 20 studies fulfilling our meta-analytic inclusion criteria is approximately 43%. Response rates are lower in more recently conducted surveys and in surveys employing longer questionnaires. Furthermore, we found that personal invitations, for example, via telephone or face-to-face contacts, yielded higher response rates compared to e-mail invitations. As predicted by sensitivity reinforcement theory, no effect of incentives on survey participation in this specific group (scoring high on neuroticism) could be observed.

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