Portable electrochemical oxygen generator

method

for

electrode,

producing

the

to a specific a

arrangement, membrane

method

electrode

in applications

gas

membrane for

diffusion

incorporated

electrode

viewing

making

arrangement,

this

and to its use

into

removing

The

absorbent

carbon-impregnated impregnated

such as fuel cells.

device

the multilayered

purposes.

preferred

for

pads

include

and

ion-exchange

generated,

and a controller

regulate

interference

the generation

and the temperature

polyamide,

unit that is used to

of oxygen,

Patent number: WO 02134970

resin

Inventors: H. Schuldzig,

membranes.

R. Kruppa,

Patent number: WO 02135624

Patent number: WO 02135216

F. Adolf, B. Roth

Inventors: H. Biegert,

Publication date: 2 May 2002

Publication date: 2 May 2002

I? Britz, V. Graf, S. Haug,

the air feed

of the PEM cell. B. Rohland,

G. Toth

Portable electrochemical generator

Publication date: 2 May 2002

of analytes in fluid

Determination samples

Method for extracting from corn

oxygen

Applicant: The Board of Trustees of the

Applicant: Gesellschafi tic Angewandte Technik mbH Greifswald, Germany

University of Illinois, USA

Applicant/Inventor: M.M. Miller, USA

The

The method

A method

electrochemical

and

mination

device

of an analyte

presence

of substances

for

analyte.

the

comprise

The

remove

interfering

embodiment

interference

A

layers,

a reagent

removing

alginate 3:l

and

layer

an

that are described

pervaporation mixtures studied and

the

speed

crosslinked PAAm

and

were

transform

infrared

separation

selectivity

Na-Alg

membrane

mixtures

containing

with an increase the

the mass

percent

Diffusion with

of

coefficients were

@

Fourier High

by the pure

water-acetic with

in the feed,

acid

selectivity than

it decreased values

for

blend

increasing

Fick’s

but not with feed.

the

Diffusion

acid equation

that

with

is

those

obtained

in

Arrhenius

in the feed using flux at 3O”C, 40°C

and

results

of solution-diffusion

M.Y. T.M.

mixtures using

Kariduraganavar, Aminabhavi:

K.S.

Radioactive poly(vinyl

chloride) to

radiation functional

(PVC)

Amino acid transport membranes

membranes

which

ion-exchangers.

characterization investigated

the bulk liquid transport

possible have

study.

applications, been

studied.

morphology.

different

investigated. investigations, membranes remove containing

studied and

X-ray

diffraction

diode

array

spectra

the

is determined

6oCo from both “Co

of the prepared

and discussed. liquid

(OLS)

The to

waste

method

The

of

as the liquid

solution

at pH

9.0 as

least squares

separately

to each

spectra rates,

found

to be very small, of the order of 10m5 mol 10”

mol 1-l min-’

lo-’

were mol I-’

for Phe, Trp and Try, respectively.

trilinear

decomposition

to estimate

compound

(TLD)

the kinetic

in the ternary rates. They

between

mixtures,

wirh

does not

so two new experiments

out using

binary

transport

of magnitude

was

for each

and also rheir

by OLS. Tyr basically

and Trp. Their ternary

profiles

mixtures

The

method

are in fair agreement

cross the membrane, were carried order

and

curves,

are

by the slope

I-’ min-‘,

of the kinetic

of pure

which

given

mixtures

of Phe

rates are of the same

as those

obtained

for the

and in this case the agreement

TLD and OLS results is excellent. M.M.C.

/. of Cbemometrics

Zntemational51(2) 150-155

2002).

2002).

used

the buffer

reverse micelles

The ordinary

transport

N.A. Maziad, MS. Sayed, E.-S.A. Hegazy: Polymer (February

phase,

using the experimental

compounds.

in time

apparatus

cell with

was applied

their

phase

in chloroform

phase.

A.M. Antunes,

and 13’Cs.

The

and a buffer

those obtained

these

of

has a great tendency

a radioactive

(AOT)

the receiving

transport

has also been

basis

the applicability

PVC-g-PAAm

has also

in polymer

min.

as the source

with a

by recording

at the receiving 30

(Trp) in a

1.5) was monitored

spectrometer

The

of phenylalanine

(pH

used

of such membranes

radionuclides On

using

differential

changes

The selectivity

mixtures

using

method.

(Tyr) and tryptophan

UV-vis

liquid

is studied

(BLM)

solution

min-’

thermal

analysis

to determine

are their

properties

addition,

been

calorimetry.

used

prepared

In

have

properties

towards

some selected

to

as oil

acids at 298 K through

(Phe), tyrosine

mixture,

and

membranes

such

buffer

membrane, onto

To elucidate

steps

process

through

membrane

of different

Aerosol-OT

preparation

basic

membranes

for

performance

of the synthetic in this

liquid

of a Schulmann

can be employed

The

of amino

hydrophobic

inrervals

films using gammahigh

products,

consisted

(AAm) was grafted

produce

corn

(10 January

waste treatment

monomer

the

Publication date: 2 May 2002

solution

Acrylamide

Other

with

1. of Applied

259-272

2002).

as

additional

The extraction

for the

and pervaporation

Polymer Science 83(2)

been

in the blends.

the

Toti,

thermogravimetric

the

oxygen

The

data obtained

scanning

vary systematically

of the water-acetic from

for

U.S.

be combined

step is then used

Inventor: M. Cheryan

are a reservoir

values

in terms

xanthophylls.

purified

Patent number: WO 02/34700

components

were calculated

The diffusion

filtration

may to

or filtration the alcohol-corn

to separate

and zein.

Other

from

slurry. A membrane

line, and a pump,

the

of water

is a

an alcohol-corn

centrifugation

a clear filtrate

produce

experiments.

as well as

was higher

anode

gas condensate

compared

flux

parameters

increasing

selectivity

with

composition, in

of water.

of GG-g-PAAm

separation

of GG-g-PAAm

calculated

blend

by

was exhibited

but

water

GG-g-

crosslinked

in the amount

selectivity

the blend

amount

The

20 mass percent

but

were

spectroscopy.

membrane

membranes,

Membranes

for

Sorption

Na-Alg

the viscosity

characterized

blend,

decreased.

was

the

of water

the

compatibility

flux increased

mass percent

for

acid

glutaraldehyde.

polymer

The permeation

tested

produces

to produce

after which

to the anode chamber

for

and

from

Soppimath, of

of water-acetic

of sound.

by

of sodium

by measuring

membranes

in

were

with

uses raw corn, or a

as a source. The source is mixed

an alcohol

air cathode

concepts.

membranes

in the ratios

Blend

in solution

data

with slurry,

the PEM,

circuit.

valve

are explained

guar-gum-grafted

separation

at 30°C.

50°C.

dense

mem-

of the invention

corn by-product

with

in the patent

reducing

and diffusion

with these

with

a

anode

a cathode

of a condensate

20 mass percent

(GG-g-PAAm)

1: 1, and

source;

by means

may be

(whereby

that is connected

activation

blends

(Na-Alg)

current

pervaporation

from

polyacrylamide

direct

form a water-cooling

and

electrolyte porous

form a PEM cell). Also included

sorption

dense

the

chamber

calculated

homogeneous

prepared

a cathode and cathode

It comprises

and a porous

to

layer. An aperture

Nonporous homogeneous membranes were

polymer

an anode chamber;

is a portable

generator.

@‘EM); a water-filled,

an

element

Research Trends Nonporous

brane

invention

oxygen

proton-conducting

separator

preferred

of this

including

a support

several layer,

the site of

or layer(s) to selectively

comprises tape

device

fluid and the reagent

substances.

is affixed

adhesive

and

pad between

test pad(s)

in rhe

with an assay

methods

of the sample

impregnated

for deter-

in a fluid sample interfering

an absorbent

application

which

is provided

subject

xanthophylls

16(2)

Ferreira,

PL.0.

Volpe:

11 l-1 16 (February

Membrane Technology June 2002