Explaining the trends of Nuclear Shielding caused by Magnetic moments related to Susceptibilties Copy

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A webpage of this site  https://saravamudhan.tripod.com/id12.html (see the left side links-panel: "other related webpages")consists of a list of the contributions in pususance of the title"Explaining the trends of Nuclear Shielding caused by Magnetic moments related to Susceptibilties"

The events which followed after (year 2003) the reports at the above link of "id12.html" are listed and particulars are posted at the tripod site: http://nehuacin.tripod.com/


In order to ascertain the scope of the contents documented in this page by the author Dr.S.Aravamudhan, the one-day seminar on SYNTHESIS and CHARACTERIZATION of NANOMATERIALS [organized by Indian Society of Analytical Scientists, Delhi Chapter & Department of Chemistry, Jamia Hamdard, New Delhi] seemed worth attending on the 17th November 2007.

Message to Organizer after the participation


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----- Original Message -----     
Aravamudhan S NEHU
Sent: Sunday, November 18, 2007 4:57 PM
Subject: Fw: Accommodation
To the Organizers
Oneday-Seminar ON
Syntheses and Characterization of NANOMATERIALS
Jamia Hamdard, Chemistry
Dear Prof. Alam,
It had been a pleasure being at Jamia Hamdard University, Department of Chemistry on the 17th November 2007 for theOneday Seminar on Syntheses and Characterization of NANOMATERIALS. While vacating the room at Scholar's House, I was told about a telephone message which the In-charge of the House received, telling not to collect any charges from me for my stay in the allotted room during the one-day seminar. As you had told the volunteers at the Registration Desk, I have been included in the list of persons for Free Registration.

I returned to Shillong on the 18th Nov. 2007 and I send this message informing you about my online registration at the ISAS website Registration Page for a Life mombership in my favour.To this initiative, I am sending by POST a Cheque for Rs. 770/- (with the break up amounts as: Registration Rs.700/- Rs.20/- admission and Rs.50/- Charges for this being an outstation Cheque) in Fvaour of the Indian Society of Analytical Chemists.Please duly acknowldege whn the Cheque is received.

I have benefitted by the proceedings of the Seminar, inparticular the technical session II on the Techniques.In fact as per the contents of my webpage https://saravamudhan.tripod.com/id7.html the information on particle size measurements, and the scttering profiles for the different shapes of particles and the distribution plots for the measured particle sizes were the informations which I have been wanting to get to know about. In the third Lecture in the afternoon session it is (probably) Umesh Tiwari  who dealt with this and I wish to seek from you Dr.Tiwari's contact address/ or the other person who answered my query on behalf of the speaker subsequently. My query was on the profiles for the different shapes indicative of the regular shapes and the possibility of getting profiles for shapes much less regular and anlysingsuh profiles in terms of the shapes for standard regular shapes, discs, cylinders and spheres. Also whether the the particle size distribution graph profile is describable in terms of known mathematical functions, and then if the answer is yes further try to explain why the aprticle size distributions in te prepared system at all have any such mathematical conformity? Then one can address also the results for different methods of preparatons etc.

Having the impression now about the Jamia Hamdarad Campus and the enterprising resource persons, I wish to express my interest in contributing to/ participate in any way I can in the events of this type at Jamia Hamdarad and in particular on the aspects along the lines of the Discussions held on "Academia & Industry Interactions" which turned out to be a refereshing recapitulation.

In this context, I would suggest that some of your faculty who are part of such organizing committee (and list out addresses of persons whose presence is to be solicited for the different occasions) should peruse the contents of some of my webpages which inscribe below and provide informations to me on the activities at jamia Hamdard University.

Convey my regards to Prof. Ahmed, VC Jamia Hamdard who gave us an overview in his keynote address.

With my best regards,

While calculating the induced fields in the various contexts for a potential application and hence at present still only striving to make sure whether all these efforts do have much more than the simple academic pursuit of simplifying for better grasping by students (of the point dipole approximations as tools for explaining quantitaively the chemical shift trends in Chemical Contexts) there seemed an extraneous consideration of some possibilities that the semimicro volume elements which are being hypotheticaly mooted are really forming themselves during the handling (preparation or processing the materials)of materials? With this in view some of the features, of the dimensions and proportions of the mathematically required hypothetical volume elements, have been brought to the notice of the materials scientists and their opinions are still awaited. A write-up in this context appears on this page.

The illustration below depicts the construction which is according to the requirements of (small circles with increasing radii along a vector length) semimicro volume elements to distribute the total susceptibility of the macroscopic specimen among the smaller elements without any loss of the totality of the magnetized material to ensure the summation resuls the experimentally measured value for the specimen.Since either by addition or taking only the wholesum material the Susceptibility is the same, when distribution is made to small elements and for each small element the dipole origin is at the small elemnts' centre. This implies that the entire susceptibility value does not contribute from the same origin for the dipole magnetic moment. If this distribution into small elements is not made then for the entire magnitude of Susceptibility only one dipole would be placed at the centre of the macroscopic sphere (for a spherical sample) where as in the present calculation there are several diplole centres at the centre of each of thesemmicro (hypothetical) spheres and this difference in one way brings the situation to more close to reality than placing a single dipole at on Centre. it is this distribution of dipole centres which is also achieved in a continous sense in working out the integrals.But the integrations restricts the possibke shapes to which these calculations can be extended. In this present method there is this continuous displacement of the dipole origin is built in,this is achieved by considering that the numerical criteria require the dipole approximation to be valid.and under this premise the summation procedure can result.




The requirement of a inner cavity in the sample for such considerations and calculations is all at great length the same as the consideration given for the Lorentz' Cavity Field.



A look-out for structures / particles of magnetized material as above is a driving force to be seeking to attend WAM-II.
Recently, as can be known from the presentations of Dr.S.Aravamudhan [contributed to the Annual National Symposia of the Magnetic Resonance Society (NMRS) particularly the 5th at Dehradun in 1999, the 6th at TIFR in 2000 and the 7th at CLRI/IIT Madaras in 2001 with the poster materials contributed at the XIII International Biophysics Congress,New Delhi (Sept.1999) ] there had been mathematical requirements for considering a magnetized specimen / materials hypothetically as a closely packed spheres with every (adjascent) sphere bearing a well defined radius ratio to the preceding & succeeding spheres. This constant radius ratio is applied successively to each volume element ( spherical) in a definite & systematic arrangement over the entire extent of the material to calculate the induced fields due to the magnetized specimen.
Do such closely packed nanostructures occur with uniform radii or with well defined radius ratios (due to the method of preparation for the example) in such away as what has been described as hypothetical volume wlements in the mathematical modeling. Can such closely packed nanostructures / particles be realized as tangible materials for the experimental verification of the validity of the equations used by considering actual measurements on these nanostructures / particles ?
The context of the spin-echo NMR measurements of field-patterns around spherical glass beads for the understanding of the effects of susceptibility reagents in membrane- transport studies is a typical example where small spherical specimens are closely-packed and mesasurements made. Instead of glass beads can a nanostructure material be realized for such considerations ?

Further informations on this context can be obtained from :

1. Prof.S.V.Bhat, Department of Physics, Indian Institute of Science, Bangalore.
2. Prof. Anil Kumar, Department of Physics, Indian Institute of Science,Bangalore. 3. Prof. K.V. Ramanathan, Sophisticated Instruments Facility, Indian Institute of Science, Bangalore.