Shlomo Magdassi

Small Particles, Big Scientific and

Industrial Challenges

מימדקפה והדפסות תלת , ננוחומרים

Nanomaterials: Materials may change their

properties at the Nano-size

Silver/gold nanoparticles

m.p. decreases with

size

1 nanometer = 1 millionth of a millimeter

A hair fiber : about 50,000 nm

Functional Printing and Coatings

with Nanoparticles

Displays

Emi

Transistors

Electronics

Coatings

Conductive inks

Substrates

Materials &Substrates

Solar harvesting

Fuel cell

Printed batteries

Energy

Disposable sensor

Anti-microbial

Tissue regen film

Bio - Tech

Smart packaging

Disposable sensors

Wink and decal

E-Packaging

Solar cells, thermo-solar plants, smart windows, touch-screens,

antennas, medical implants and pills ,sensors, soft robots….

Dispersing nanoparticles within liquids

Paints and Inks

Goal :to deliver functionality beyond color

Example:

Mixing black ceramic nanoparticles in liquid:

Heat resistant black coatings

Application: Thermo-Solar coating for energy

harvesting

With Prof. Mandler

Need: High T resistant Nano-absorbers

Solar paint licensed to Brightsource Energy

Spray coating large metal substrates

Power Production: 377 MW

The largest solar thermal power plant in the world,

140,000 homes served annually in California

Paint formulations are made by

same methods for making

cosmetic products

Patterning requires printing

Inkjet printing of nanoparticles

Ink-Jet Inks for glass based on

ceramic nanoparticles

GlassJet

Initial goal:

protecting the glue for

car-window from sunlight

Pigment = ceramic nanoparticles

Binder = glass nanoparticles

by DipTech

Printing glass and ceramic nanoparticles

Touch screens

Sensors

Light-emitting diodes

PCBs

E paper

Printed Electronics

Every device needs an electrical conductor

Our main objective :conductive inks

Developing materials and technologies

needed to form the electric wiring

Nanomaterials synthesis, ink formulations,

printing and sintering

Inks composed of metal nanoparticles, CNTs

Major Challenges: Achieving high Ag concentration without aggregation

High conductivity

Conductive Silver Inks

100 nm

Size and morphology control

One pot synthesis

Printed Ag NP: No Conductivity at low temp

Metal particles are separated by an insulating organic layer

A major challenge : sintering

Conductivity is obtained only after heating to high temperatures

230 ° C: Nano effect

T

Printing electrical conductors on

solar cells, by silver nanoparticles

Printing front electrodes

Printed plastic electronics ?

a cb

Discovery: Silver nanoparticles can merge at

room temperature , if particles are in close contact

Nature Communications 2014

Metal particles behave as a water droplet !

Silver NP

on Gold NP

Can we induce close packing of

nanoparticles, which would enable

coalescence within printed lines at

low T ?

Important for plastic electronics

Surface tension driven flow:

Pepper on water

Coffee spills : a rim is formed,

composed of coffee particles

Deegan , Nature

“coffee ring effect”

Making Conductive rings by “coffee ring effect”

We took silver NP instead of coffee

Each ring is conductive

Sintering at room temperature !

Making contacts :

Inkjet printing of invisible lines

made of silver rings

C-AFM

2D arrays of silver ringsTransparent Conductive Films

~ 3 um rim width

Each ring is conductive

Why do we need transparent and

conductive patterns ?

Touch screens

Displays

Light-emitting diodes

Solar cells

Smart windows

Smartphones

Connected rings as

ITO replacement for smartphones

Flexible, direct patterning, no etching

Printing IPod touch screen

Smart windows:

changing color/blocking light / IR

Nanoscale 2014

with P.S. Lee, NTU

0.94

0.56

1.00

Conductivity

relative to silver

0.007

0.002

Copper

Aluminum

1.00Silver

Cost

Prices: May 2014

Ag 620 $/Kg

Cu 7 $/Kg

Al 1.9 $/Kg

Other metals ?

Cost

relative to silver

Air

Cu inks: the oxidation challenge

Cu Cu2O & CuO

Copper NPs are unstable in air

Stable copper inks

Chemical Communications, 2015

Advanced Materials and interfaces, 2014

Next Challenge : 3D printed devices ?

What is 3D Printing?

Additive Manufacturing

Layer by Layer Printing

Y

X

Y

X

Z

Main advantages of 3D Printing

1. Bottom-up manufacturing (saving material)

2. Fabrication of complex structures

3. Additive process

Complex structures by 3D printing

(bottom-up)

Wooden bowl fabrication

(top-down)

Main Methods for 3D printing

Selective curing of photo-

sensitive monomer by UV

Selective sintering or binding

of particles in powder

Selective deposition of

melted plastic filaments

Engineering/prototyping

• Models for surgeons

• Tailored hearing-aids

• Customized implants and prosthetics

• Dentures

• Smart pills

Biomedical applications

DLP Printers

FDM Printers

Printing on 3D Structures Polyjet Multi Material

Powder Binding

Active Research Fields

Computer Science Biology

ChemistryBiomedical

Agriculture Physics

Engineering

Pharma

College of Eng.

Art (Bezalel)

3D printing of functional objects

with Prof. Banin

Dispersing QD within the monomers

to yield fluorescent objects

3D electrodes:

Silver NPs within porous structures

Printing in water :

hydrogels for artificial organs

Advanced Materials 2015

with Prof. Cohn

4D printing : moving objects with

time / T / H2O…

BioMedical applications

4D Printing: Moving Objects with Time/Temp

Soft robotics applications

Advanced Materials 2015

with Prof. Cohn

Moving jewelryby Shira Eliazar, Bezalel Academy of Art and Design

Coffee break

Printing coffee ink on coffee,

http://www.coffeeripples.com/

EU: FP6 - SelectNano, FP7 - Lotus, CoWet

Singapore NRF - CREATE

Israel Ministry of Science

Israel Ministry of Economy

HUJI: Yissum