Portable NanosensorsEnvironmental nanotechnology

aiding sustainability

Omowunmi “Wunmi” Sadik

Department of Chemistry

SUNY-Binghamton

CBET Nanograntees December 3, 2012, Arlington, VA

Sustainable

NanotechnologyNanotechnology

(www.susnano.org)

Wunmi SadikDepartment of ChemistrySUNY-Binghamton

Brundtland:

“Development that meets the needs of

the present without compromising the ability of future generations to meet their needs”

Pillars of sustainability

http://restaurantsustainability.wordpress.com/2012/05/16/

pillars-of-sustainability-addition-of-the-life-cycle-analysis/pillars-of-sustainability/

Sustainable nanotechnology

GREEN

ENERGY

Green Synthesis Implications

Sustainable Nanotechnology

SocietyEducation

Sustainable Nanotechnology

Innovation Chain

SNO is building an ecosystem of sustainable

innovations in nanotechnology

Project Goals & Objectives

• Develop an environmentally-relevant, portable nanoparticle analyzer which can measure various levels of nanomaterials directly from pure standards, simulated matrices and real-world standards, simulated matrices and real-world samples

• The resulting technology should provide information

about the size or shape of the nanoparticle, which are

important factors for determining toxicity; as well as

distinguish them from naturally-occurring particles.

Sustainable Nanoconcept

Nanosensors(electrochemical)

Nanoporous membranes(naturally-derived)

Monitoring tools with

minimal energy input or byproducts

Characterizes

nanotoxicity

Environment(over large areas)

(naturally-derived)

Revers

ible

Tunable

Zero

waste

RecycleDestroys

pollutantsMinimal impacton the environment

nanotoxicity

Flexible Polyamic Acid

Membranes

Breimer MA, Yevgheny E., Sadik OA, Nano Lett., 2001, 1, 305

Phase-inverted membranes

Nian Du, Sadik et al, Flexible Nanoporous

Membranes, Langmuir, 26(17) 14194-14202, 2010.

Silver

NP

Mechanism for capturing silver

NPs on PAA membranes

NPSilver

NP

C

O-O

C

O-O

O-O

C

O-O

C

O-O

N

HN

H

CO- O

N

HN

H

PAA

1st PAA membrane Layer

Standard Continuous separation

2nd PAA membrane Layer

Standard Continuous separation

3rd PAA membrane Layer

Standard Continuous separation

Classes of Nanomaterials

• Superior than Anodisc membranes

• Filtration efficiency reached 99.97%

PAA membrane for detection of

silver NPs

-80.00

-60.00

-40.00

-20.00

0.00

20.00

40.00

60.00

80.00

100.00

120.00

Cu

rre

nt

(uA

)

PAA

40nm AgNPs

20

40

60

80

100

120

140

160

180

200

Cu

rre

nt

(uA

)

Blank gold

PAA

Colloidal Silver

MesoSilver

Sovereign Silver

-100.00

-80.00

-200 -100 0 100 200 300 400

Potential (mV) vs. Ag/AgCl

0

20

40

60

80

100

120

140

160

180

-250 -150 -50 50 150 250 350 450

Potential (mV) vs. Ag/AgCl

Cu

rren

t (u

A)

1.3ppm

4.0ppm

6.7ppm

10ppm

12ppm

18ppm

24ppm

y = 6.846x + 4.3828

R2 = 0.9949

0

20

40

60

80

100

120

140

160

180

200

0 5 10 15 20 25

Concentraion

Cu

rrre

nt

(uA

)

0

20

-250 -150 -50 50 150 250 350 450

Potential (mV) vs. Ag/AgCl

Concentration

determined by

our method

(ppm)

Concentration

determined by

AAS (ppm)*

Concentration

reported by

manufacturers

(ppm)

Meso Silver 23.67 20.6 21.1

Colloidal

Silver16.64 16.9 35-40

Siveregion

Silver10.58 11.8 10

*AAS analysis was done with Rob Congdon

Summary and Outlook

•We are developing a portable nanoparticle analyzer

based on poly(amic) acid mebranes. The instrument

is equipped with nanoporous membrane electrode

arrays that perform multiple functions:arrays that perform multiple functions:

� Isolates

� Captures

� Detects