Received: from mx03.ecn.purdue.edu (mx03.ecn.purdue.edu [128.46.105.218]) by mailbag.ecn.purdue.edu (8.14.4/8.14.4) with ESMTP id q6AIJha5004408 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Tue, 10 Jul 2012 14:19:43 -0400 (EDT) Received: from mailhub130.itcs.purdue.edu (mailhub130.itcs.purdue.edu [128.210.5.130]) by mx03.ecn.purdue.edu (8.14.4/8.14.4) with ESMTP id q6AIJF0g028843 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Tue, 10 Jul 2012 14:19:15 -0400 Received: from WPPEXHUB03H.purdue.lcl (wppexhub03h.itap.purdue.edu [172.21.6.92]) by mailhub130.itcs.purdue.edu (8.14.4/8.14.4/mta-nopmx.smtp.purdue.edu) with ESMTP id q6AIJESx029038; Tue, 10 Jul 2012 14:19:14 -0400 Received: from VPEXCH02.purdue.lcl ([169.254.2.213]) by WPPEXHUB03H.purdue.lcl ([172.21.6.92]) with mapi; Tue, 10 Jul 2012 14:19:14 -0400 From: "Stacey, Lisa A" To: "'msefaculty-list@ecn.purdue.edu'" , "'msepostdoc-list@ecn.purdue.edu'" Date: Tue, 10 Jul 2012 14:19:13 -0400 Subject: Reminder -K. Hess Seminar, Wed. 7/11, 9:00 AM, ARMS Rm 1109 Thread-Topic: Reminder -K. Hess Seminar, Wed. 7/11, 9:00 AM, ARMS Rm 1109 Thread-Index: Ac1eyIJdqejTTQhjT9ujLxt0nEySHw== Message-ID: <92F872D971E7AA498CF64DD847E5594D9141481046@VPEXCH02.purdue.lcl> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: acceptlanguage: en-US x-perlmx-virus-scanned: Yes x-pmx-version: 5.5.9.388399 x-ecn-mailserver-origination: mailhub130.itcs.purdue.edu [128.210.5.130] x-ecn-mailserver-spamscanadvice: DoNotScan x-ecn-mailserver-virusscanned: by amavisd-new Content-Type: multipart/related; boundary="_004_92F872D971E7AA498CF64DD847E5594D9141481046VPEXCH02purdu_"; type="multipart/alternative" MIME-Version: 1.0 --_004_92F872D971E7AA498CF64DD847E5594D9141481046VPEXCH02purdu_ Content-Type: multipart/alternative; boundary="_000_92F872D971E7AA498CF64DD847E5594D9141481046VPEXCH02purdu_" --_000_92F872D971E7AA498CF64DD847E5594D9141481046VPEXCH02purdu_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MATERIALS SCIENCE AND ENGINEERING SEMINAR Generation of Colloidal Granules and Capsules from Double Emulsion Drops by Kathryn Hess Ph.D. Final Exam Advisor: Prof. C. Martinez ABSTRACT Assemblies of colloidal particles are extensively used in ceramicprocessing= , pharmaceuticals, inks and coatings. In this project, the aim was to deve= lop a new technique to fabricate monodispersed colloidal assemblies. The u= se of microfluidic devices and emulsion processing allows for the fabricati= on of complex materials that can be used in a variety of applications. A m= icrofluidic device is used to create monodispersed water/oil/water (w/o/w) = double emulsions with interior droplets of colloidal silica suspension rang= ing in size from tens to hundreds of microns. By tailoring the osmotic pre= ssure using glycerol as a solute in the continuous and inner phases of the = emulsion, we can control the final volume size of the monodispersed silica = colloidal crystals that form in the inner droplets of the double emulsion. = Modifying the ionic strength in the colloidal dispersion can be used to af= fect the particle-particle interactions and crystal formation of the final = colloidal particle. This w/o/w technique has been used with other systems of metal oxide colloi= ds and cellulose nanocrystals. Encapsulation of the colloidal suspension i= n a polymer shell for the generation of ceramic-polymer core-shell particle= s has also been developed. These core-shell particles have spawned new rese= arch in the field of locally resonant acoustic metamaterials. Systems and chemistries for creating cellulose hydrogels within the double = emulsions have also been researched. Water in oil single emulsions and dou= ble emulsions have been used to create cellulose hydrogel spheres in the su= b-100 micron diameter range. Oil/water/oil double emulsions allow us to cr= eate stable cellulose capsules. The addition of a second hydrogel polymer,= such as acrylate or alginate, further strengthens the cellulose gel networ= k and can also be processed into capsules and particles using the microflui= dic device. This work could have promising applications in acoustic metamat= erials, personal care products, pharmaceuticals, and agricultural applicati= ons, among others. Date: Wednesday, July 11, 2012 Time: 9:00 A.M. Place: ARMS 1109 Lisa Stacey Secretary/Development Assistant Purdue University School of Materials Engineering 765/494-4100 --_000_92F872D971E7AA498CF64DD847E5594D9141481046VPEXCH02purdu_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable = <= meta name=3DGenerator content=3D"Microsoft Word 12 (filtered medium)">

 

MATERIALS SCIENCE AND ENGINEERING

SEMINAR

 <= /p>

Gener= ation of Colloidal Granules and Capsules from Double Emulsion Drops

=  

by

 

Kathryn Hess

Ph.D. Final Exam

Adviso= r:  Prof. C. Martinez

 

ABSTRACT

 

Assemblies of colloidal= particles are extensively used in ceramicprocessing, pharmaceuticals, inks= and coatings.  In this project, the aim was to develop a new techniqu= e to fabricate monodispersed colloidal assemblies.  The use of microfl= uidic devices and emulsion processing allows for the fabrication of complex= materials that can be used in a variety of applications.  A microflui= dic device is used to create monodispersed water/oil/water (w/o/w) double e= mulsions with interior droplets of colloidal silica suspension ranging in s= ize from tens to hundreds of microns.  By tailoring the osmotic pressu= re using glycerol as a solute in the continuous and inner phases of the emu= lsion, we can control the final volume size of the monodispersed silica col= loidal crystals that form in the inner droplets of the double emulsion.&nbs= p; Modifying the ionic strength in the colloidal dispersion can be used to = affect the particle-particle interactions and crystal formation of the fina= l colloidal particle.

 =

This w/o/w technique has been used with other syst= ems of metal oxide colloids and cellulose nanocrystals.  Encapsulation= of the colloidal suspension in a polymer shell for the generation of ceram= ic-polymer core-shell particles has also been developed. These core-shell p= articles have spawned new research in the field of locally resonant acousti= c metamaterials.

 

<= p class=3DMsoNormal>Systems and chemistries for creating cellulose hydrogel= s within the double emulsions have also been researched.  Water in oil= single emulsions and double emulsions have been used to create cellulose h= ydrogel spheres in the sub-100 micron diameter range.  Oil/water/oil d= ouble emulsions allow us to create stable cellulose capsules.  The add= ition of a second hydrogel polymer, such as acrylate or alginate, further s= trengthens the cellulose gel network and can also be processed into capsule= s and particles using the microfluidic device. This work could have promisi= ng applications in acoustic metamaterials, personal care products, pharmace= uticals, and agricultural applications, among others.

 

 

Date:   Wednesday, July 11, 2012

<= p class=3DMsoHeading9 style=3D'text-align:justify'>Time:        9:00 A.M.

Place:   A= RMS 1109

 

 

Lisa Stacey

Secretary/Development Assistant

Purdue University

School of Materials Engineering

765/494-4100

 

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