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Harvesting Energy from Fluid-based Triboelectric Nanogenerator and its Versatile Applications as Mechanical Transducer

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Abstract
With the increasing demand of electricity supply and usage of portable
electronics in our day to day life, self-powered system has brought a revolutionary
change in the recent decades to mitigate the excess pressure on power grid.
Following the other nanogenerators like piezoelectric, thermoelectric, triboelectric
nanogenerator (TENG) has come up with the utilization of waste mechanical energy
into useful power sources. The main advantages of TENG over traditional battery
systems are that it doesn’t need to be replaced over time, can continuously harvest
energy from the ambient source that can be stored in the capacitors for future supply,
very flexible.
Triboelectric nanogenerator (TENG) comprises of the contact electrification and
electrostatic induction. When two dissimilar materials are bought into physical
contact with each other due to electrostatic induction there is a redistribution of
charges with the opposite sign on the two surfaces according to tribopolarities. After
a while, separation occurs by means of any external mechanical force which induces
triboelectricity that can generate a potential drop and drive the electrons to flow
between the electrodes attached with the surfaces. TENG has four fundamental
modes till now, including, vertical contact-separation mode, lateral sliding mode,
singe electrode mode, freestanding sliding mode. In addition, a lot of structures,
prototypes and functions have already been reported and are still going on.
Mostly triboelectric devices involve solid-solid contact electrification. The
charge generation through friction process solely depends on the difference of the
ability of the two surfaces to loss or gain electrons. Electrical output can be improved
via change of the surface morphological properties in this process. Nevertheless, the
performance can be greatly influenced by the air humidity, dust, which causes
instability of the output values of the solid-solid TENG without any encapsulation.Also wear abrasion due to physical collision deteriorates the long-term output
stability of the TENG. However, liquid-solid contact electrification has
demonstrated the capability of stable response with full contact separation process
with the counter solid part. The output shows regular behavior for long term
application with good wear resistance while using the liquid for contact. In liquidsolid TENG, the liquid can change its shape and mostly work as a positive tribomaterial that exhibit feasibility to be used in flexible and wearable sensor
applications. Considering possible advantages of the liquid in TENG application, in
this thesis, I’ve taken in account the fluid-structure interaction problem for two cases
peristaltic flow in elastic tubing as energy harvester and velocity sensor on the other
hand, PDMS based microfluidic platform to sense the pressure and frequencies of
the rotary actuator that manipulates the motion discrete liquid column in the channel
over thin polymeric film. In the first investigation, a relationship has been developed
between the peristaltic laminar flow dynamics while interacting with the PVDF
microporous membrane and the generation of voltage and current. Moreover, the
described energy harvester can also work as flow sensor. From the second
investigation, it is found that, the MEMS device can be effectively used as the
transducer to measure the certain frequencies and pressures of rotary actuator
Author(s)
샤흐리아르 엠
Issued Date
2019
Awarded Date
2020-02
Type
Dissertation
URI
https://oak.ulsan.ac.kr/handle/2021.oak/6199
http://ulsan.dcollection.net/common/orgView/200000284779
Affiliation
울산대학교
Department
일반대학원 기계자동차공학과
Advisor
Prof. Kyoung Kwan Ahn
Degree
Master
Publisher
울산대학교 일반대학원 기계자동차공학과
Language
eng
Rights
울산대학교 논문은 저작권에 의해 보호받습니다.
Appears in Collections:
Mechanical & Automotive Engineering > 1. Theses (Master)
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