Subject:
Fwd: Re:
Date:
Mon, 25 Jan 1999 23:15:11 PST
From:
"thitipong kornprapakul" <k_thitipong@hotmail.com>
To:
kitipat.s@chula.ac.th




>Date: Mon, 25 Jan 1999 13:53:52 +0000
>From: "Prof. J. F. Scamehorn" <scamehor@ou.edu>
>Reply-To: scamehor@ou.edu
>To: thitipong kornprapakul <k_thitipong@hotmail.com>
>CC: Kunchana.B@chula.ac.th
>Subject: Re:
>
>Thitipong:
>
>I am pleased to have you as a student. First, please always cc: your
>coadvisors on any correspondence with me so they will know what is
going
>on.
>
>You first need to read the information on surfactant adsorption
>generally, then on inks and paper. I will make a copy of the
>dissertation of Lle Riviello whose work you are following up on. Dr.
>Riviello showed that surfactant adsorption, not precipitation is
>responsible for ink flotation in deinking. He showed that coadsorption
>of calcium with surfactants is crucial to the process. He measured
>surfactant and calcium adsorption on ink and on paper fibers, but did
>not obtain quite detailed adsorption isotherms. So, your project is to
>investigate in detail the adsorption characteristics of surfactants and
>coadsorption of calcium on ink. Variables could be surfactant type, pH,
>and calcium concentration. We can settle on specifics later on. Right
>now, I would suggest starting on the same or similar model ink that
>Riviello used and use sodium dodecyl sulfate and sodium octanoate as
the
>surfactant. the surfactants need to be highly purified so may take a
>recrystallization step even though you get the highest purity available
>from suppliers. This is because your thesis is to understand the
>mechanisms involved, so careful work is critical.
>
>Check the short course notebook in the library under the sectio of
>surfactant adsorption at the solid/liquid interface and see what papers
>are available for copying from that. Let me know, so I can send you
>critical papers if they are missing. You will also need to do a
>literature survey of adsorption of surfactants on hydrophobic surfaces
>since most of my work has been on hydrophilic surfaces. Also, there
are
>three or more theses in the college supervised by Dr. Harwell on
>adsorption isotherms of surfactants which you can learn from. When you
>receive Riviello's dissertation in the mail, study it carefully.
>
>Development of analytical methods to measure surfactant concentration
>and calcium concentration in solution to obtain adsorption isotherms is
>going to be a major task for you. HPLC can be used for SDS. For
>calcium, I think that the college has a atomic absorption spectrometer.
>For sodium octanoate, it is more difficult, but the total organic
carbon
>analyzer in the college may be the best way.
>
>thitipong kornprapakul wrote:
>>
>> Dear Sir,
>> I am a first year student at PPC. My name is Thitipong
>> Kornprapakul and I am working on Master Thesis Topic, " Adsorption of
>> surfactants on inks related to paper recycling". I think this thesis
is
>> very interesting and I have got to start and repeat the surfactant
>> concept from Rosen's book. But I would like to know about the
>> information, which related on this thesis, may be former work at
>> Okhahoma University or anything that you can sugggest to me.
>> Finally, If you have any suggestion, please let me know and I am
ready
>> to work with you.
>> Sincerely Yours,
>> Thitipong Kornprapakul
>>
>> ______________________________________________________
>> Get Your Private, Free Email at http://www.hotmail.com
>
>--
>
>********************************************************
>John F. Scamehorn
>Asahi Glass Chair in Chemical Engineering
>Institute for Applied Surfactant Research
>School of Chemical Engineering and Materials Science
>100 E. Boyd
>University of Oklahoma
>Norman, Oklahoma 73019
>
>Ph. 405-325-4382
>FAX 405-325-5813
>
>e-mail: scamehor@ou.edu
>
>********************************************************


______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com