Functional, RF-Trilayer Sensors for Tooth-Mounted, WirelessMonitoring of the Oral Cavity and Food Consumption

Journal: Advanced Materials

Authors: P. Tseng and F. G. Omenetto et al.

Affiliation: Tufts University (U.S.A.)

Publication date: 2018.03.23

Summarized by Inyeol Yun

 

– Structure
v. Au-Ti-(interlayer)-Ti-Au
v. 2 mm x 2 mm size

fig1.png

Fig. 1

fig2.png

Fig. 2

 

– Result
v. S11 change of various solvents and solutions (Fig. 3)
v. Resonant frequency vs. glucose concentration (Fig. 4)
v. Resonant frequency vs. temperature and pH (Fig. 5)

fig3.png

Fig. 3

fig4.png

Fig. 4

fig5

Fig. 5

 

– Measurement
v. In-vitro : HP 8753E impedance analyzer
v. In-vivo : miniVNA (Fig. 6)

fig6.png

Fig. 6

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Gauging force by tapping tendons

Journal: Nature Communications

Authors: J. Martin and D. G. Thelen et al.

Affiliation: University of Wisconsin-Madison (USA)

Publication date: 2018.04.23

Summarized by Inyeol Yun

 

– Principle

v. tapping tendons à vibration velocity change such as guitar!!

fig1

Fig. 1

 

– Result
v. High load  High wave speed (Fig. 2)
v. Achilles wave speed vs. ankle torque (Fig. 3)
v. Wave speed vs. running speed (Fig. 4)

fig2.png

Fig. 2

fig3

Fig. 3

fig4.png

Fig. 4

Biodegradable Piezoelectric Force Sensor

Journal: Proceedings of the National Academy of Sciences

Author: Eli J. Curry and Thanh D. Nguyen et al.

Affiliation: University of Connecticut

Publication date: 2018.01.16

Summarized by Inyeol Yun

 

– Structure
v. PLA Encapsulator – Molybdenum – Piezo. PLLA – Molybdenum – PLA Encapsulator (Fig. 1)

fig1.png

Fig. 1

 

– Fabrication
v. Cut the Molybdenum and PLLA film.
v. The PLLA film was sandwiched between two Mo electrodes.
v. Encapsulator was sealed using a combination of the biodegradable PLLA glue and a thermal bag sealer for 4 seconds. (Fig. 2)

fig2.png

Fig. 2

 

– Principle
v. Piezoelectricity (Fig. 3)
v. PLLA : new piezoelectric material (normally not piezoelectric material) (Fig. 4)
v. PLLA -> shear stress -> nucleation -> piezoelectricity (Fig. 5)

fig3.png

Fig. 3

fig4.png

Fig. 4

fig5

Fig. 5

 

– Result
v. Vibration test: Drain ratio (DR) 2.5 output is largest but it is not conclusive optimal DR (Fig. 6)
v. Pressure – Voltage with charge amplifier circuit
v. Biocompatible, Biodegradable test (Fig. 7)
v. In-vivo test: inside the abdominal cavity of a mouse to monitor the pressure of diaphragmatic contraction (Fig. 8)

fig6.png

Fig. 6

fig7.png

Fig. 7

fig8.png

Fig. 8

Cephalopod-inspired Design of Electro-mechano-chemically Responsive Elastomers for On-demand Fluorescent Patterning

Journal: Nature Communications

Publication date: 2014.09.16

Summarized by Seongmin Park

 

– Squid Coloration Principle
v. Pigment-containing sac: Area controlled by radial muscle
v. Radial muscle: control colored area

fig1.png

Fig. 1

 

– EMCR elastomer
v. Fabrication of electro-mechano-chemically responsive (EMCR) elastomer – Figure 2
v. Applying force → fluorescent, applying visible light → transparent – Figure 3

fig2.png

Fig. 2

fig3.png

Fig. 3

 

– Applied strain vs. fluorescent intensity
v. Figure 4

fig4.png

Fig. 4

 

– Electrically controllable structure
v. Initial structure – Figure 5
v. With high electric field – Figure 6
v. Induced high strain – Figure 7

fig5.png

Fig. 5

fig6.png

Fig. 6

fig7.png

Fig. 7

 

– Wrinkle generation principle
v. Cratered structure is more stable than flat structure when it’s in high electric field – Figure 8, 9

fig8.png

Fig. 8

fig9

Fig. 9

 

– Electric field vs. color image
v. Figure 10

fig10.png

Fig. 10

fig11.png

Fig. 11

Hydraulically amplified self-healing electrostatic actuators with muscle-like performance

Journal: MATERIALS SCIENCE

Author: Xin Lin , Berthold Wegner et. al

Affiliation: Department of Mechanical Engineering, University of Colorado

Publication date: 2018.01.05

Summarized by Taewon Seo

 

– HASEL actuators
v. Schematic of a donut HASEL actuator (Fig. 1)
v. Schematic of a stack of five donut HASEL actuators (Fig. 2)
v. Schematic of a single-unit planar HASEL actuator (Fig. 3)

fig1

Fig. 1

fig22.jpg

Fig. 2

fig3.jpg

Fig. 3

 

– Fabrication
v. For a donut HASEL (Fig. 4)
v. For a single-unit planar HASEL (Fig. 5)
v. Flexible electrodes of PAM-LiCl hydrogels (thickness of 200μm)
v. Self-healing Liquid dielectric of Envirotemp FR3 (Cargill)

 

fig4.jpg

Fig. 4

fig5.jpg

Fig. 5

 

– Self healing
v. Self-healing from dielectric breakdown (Fig. 6)
v. Self-healing capabilities (Fig. 7)
v. Supporting information : http://science.sciencemag.org/highwire/filestream/704298/field_highwire_adjunct_files/2/aao6139s2.mp4

fig6.jpg

Fig. 6

fig7.jpg

Fig. 7

 

– Result
v. Actuation strain of a donut HASEL (Fig. 8)
v. Cycle life of a donut HASEL (Fig. 9)
v. Actuation strain of a single-unit planar HASEL (Fig. 10)
v. Supporting information : https://www.youtube.com/watch?v=M4qcvTeN8k0

fig8.jpg

Fig. 8

fig9

Fig. 9

fig10.jpg

Fig. 10

Robust resistive memory devices using solution-processable metal-coodinated azo aromatics

Journal: NATURE MATERIALS

Author: S. Goswami and Adam J. Matula et al.

Affiliation: NUSNNU-NanoCore, National University of Singapore

Publication date: 2017.10.23

Summarized by Taewon Seo

 

– Structure
v. Molecular view of compound mer-[Ru(L)3](PF6)2 structure (Fig. 1-a)
v. Schematic of device(Fig.1-b)
v. Basic device (type A), second device (type B) (Fig.1-c)
v. Au nanoparticles are sputtered in type B

fig1.png

Fig. 1

 

– Characteristics
v. Current density-voltage characteristics for device A (Fig.2)
v. Current density-voltage characteristics for device B (Fig.2)
v. Nano scale test device(Fig.3)

fig2.png

Fig. 2

fig3.png

Fig. 3

 

– Mechanism
v. Raman spectra measured for thin-film devices (E1 = 1,365cm-1, E2 = 1,313cm-1, E3 = 1,275cm-1) (Fig.4)
v. E1 : neutral, E2 : single-electron reduction, E3 : doubly reduced species
v. Correlation between Raman peaks and film conductance (Fig.5)
v. In the on-state, all molecules are same redox state.

fig4.png

Fig. 4

fig5.png

Fig. 5

 

– Role of counterions
v. LUMO of [Ru(L)3]2+, the strongest π-acceptor ligands (Fig.6)
v. Variation in HOMO and LUMO energy levels (Fig.7)
v. Variation in Electrode and LUMO energy levels (Fig.8)
v. The spatial molecule and counterion results in the formation of dipoles.
v. The applied electric field in the device displace counterions from on pocket to another.

fig6.png

Fig. 6

fig7.png

Fig. 7

fig8.png

Fig. 8

 

– Device performance
v. Read-write pulse sequence for device A & B

fig9afig9bfig9c

Fig. 9

Flexible Piezoelectric Devices for Gastrointestinal Motility Sensing

Journal: Nature Biomedical Engineering

Author: C. Dagdeviren and G. Traverso et al.

Affiliation: Massachusetts Institute of Technology, Cambridge, United States

Publication date: 2017.10

Summarized by Inyeol Yun

 

– Piezoelectric gastrointestinal motility sensor (Fig. 1)

v. 12 groups in series, 10 groups in parallel. (Fig. 2)

v. Sensing principle: piezoelectric material (Fig. 3)

fig1

Fig. 1

Fig. 2

fig3.png

Fig. 3

 

– Biocompatibility

v. Live/dead cytotoxicity analysis of HT-29-MTX-E12, HeLa and C2BBe1 cells incubated with neutralized simulated gastric fluid for three days.

v. Cells treated with 70% ethanol were used as a negative control.

v. Cells treated with neutralized gastric fluid that had not been in contact with the microchips were used as a positive control

v. Green indicates viable cells and red indicates dead cells. (Fig. 4)

fig4.png

Fig. 4

 

– Result

v. Voltage output for a flouting and glued PZT GI-S in a balloon with 200 ml water infusion (Fig. 5)

v. In vivo evaluation in Yorkshire swine model (Fig. 6)

fig5

Fig. 5

fig6.png

Fig. 6

 

– Reference

v. http://blog.naver.com/kt9411/150165849100 (2017-11-21)