Untitled Document

ISSSTWIC	Indian Society for Surface Science and Technology *Western India Chapter*
	...c/o Dept. of Chem. Engng., Indian Institute of Technology, Powai, Mumbai - 400 076, INDIA

Date-Time / Venue
Particulars

Abstract

Feb 20, 2007
Dr.Prakash Mehta, Zydex
Emerging Nano-Technologies in water proofing

Nov 19, 2005
UICT

One Day Seminar on Instrumentation in Colloid and Interface Science
Report

Sept 27, 2005
Seminar by Prof Sandip Roy, IIT-B
Roll up of oil drops during detergency, UICT 5pm

11-13/12/03
UICT
National Conference on Dec. 11-13, 2003, UICT, Matunga

25/07/03
IIT-Bombay, Powai 1. Lecture by Dr Panda on July 25th, 2003 4 pm, IIT, Powai

20/0103
UICT
Refresher course in Coloid Interface Science

17/12/02
Baroda Two day seminar

13/12/02
UICT Seminar by Dr. Mohan Rao

19/08/02
UICT Seminar By Dr. Pradip The development of tailor-made additives, designed for enhancing the performance of specific particulate processing unit operations is vital for the minerals and materials processing industry. Some examples include design of highly efficient dispersants for paints, pigments and advanced ceramics applications, controlling the wettability/compatibility of dispersed phase through the application of suitable additives for applications in mineral processing (selective flotation reagents and tailor made flocculants), textiles (finishing agents), cements (grinding aids, super-plasticizers), water treatment (corrosion inhibitors) and fertilizers/alumina production (crystal modifiers). Both the choice of the functional group as well as selection of an appropriate molecular architecture (aliphatic, aromatic or polymeric chains) depending on its end use, determines its efficacy for a given application. Recent research efforts including those of our group clearly indicate a definite paradigm shift from conventional trial & error methodologies to a rational, robust approach to design/selection of performance chemicals/ reagents/ additives, tailor made for specific applications. Two important components of this novel paradigm of reagents design are: (a) identification of molecular recognition mechanisms underlying selective adsorption at solid/solution interfaces and (b) development/validation of appropriate molecular modeling techniques/ tools for screening/ shortlisting the promising molecules based on theoretical computations alone, for a target application.
The utility and power of our molecular modeling based design approach is illustrated in this presentation with the help of a few selected examples drawn from our own work. The case studies include design of three family of reagents belonging to phosphonic acids, carboxylic acids and hydroxamic acids respectively, in order to control the wettability of calcium minerals (fluorite, calcite and fluorpatite); design of phosphonic acid based corrosion inhibitors; optimization of the molecular architecture of carboxylic acid derivatives as crystal growth modifiers & also as dispersants for titania based paints and design of appropriate dispersants for alumina and zirconia ceramic suspensions.

Oct. 23rd, 2002
UICT, Mumbai 400 019 Seminar By Prof. Heinz Hoffman

Dec. 21, 2001 , 2001,
Venue: ICI R&T Centre Vashi Time: 3:30 p.m. Seminar on: MICELLAR KINETICS AND ITS SIGNIFICANCE TO VARIOUS TECHNOLOGICAL PROCESSES
MICELLAR KINETICS AND ITS SIGNIFICANCE TO VARIOUS TECHNOLOGICAL PROCESSES

Dr. Dinesh O. Shah, Director of the Center for Surface Science and Engineering, and The First Charles A. Stokes Professor of Chemical Engineering and Anesthesiology, University of Florida,Gainesville, Florida, USA
(E-Mail: shah@che.ufl.edu)

Using various techniques such as P-Jump, Stopped-Flow etc, the relaxation of micellar solutions were determined. For sodium dodecyl sulfate solutions, it was shown that it had the highest relaxation time at 200 mM. This concentration is about 25 times larger than the CMC. It was further shown that the foamability was minimum, wetting time maximum, emulsion size maximum, and detergency maximum at 200 mM SDS concentration. Thus, it was concluded that the micelle stability is a rate limiting factor in many technological processes where micelle break up is needed to release more monomers to occupy the newly created surface. Molecular aspects of engineered mixed micelles and their possible technological applications will be discussed during the lecture.

21/11/2000 UDCT One Day Seminar on:
Instrumental Methods in Colloid and Interface Science The field of colloid and interface science is growing fast both in industrial applications as well as in scientific understanding and the role of instrumentation in bridging the gap in between is undeniable. It is always a great help to share experiences of the use of these instruments for various purposes and learn from these; especially when the information is coming from scientists who have first hand experience with the instruments. This seminar is being organised with the aim of bringing various instrument users together on a common platform.

25/11/2000 CAD Center Lecture by Clarence A. Miller Department of Chemical Engineering, Rice University Houston, Texas, 77251-1892, USA.
Drops having diameters of order 100 m and containing various combinations of oils, surfactants, and in some cases alcohols were injected into water or aqueous salt or buffer solutions. The resulting dynamic behavior was observed by videomicroscopy. Spontaneous emulsification yielding oil droplets a few microns in diameter was seen in a variety of systems when diffusion and/or chemical reaction caused inversion of the drop from an oil-continuous to a water-continuous phase, leading to local supersaturation in oil. Surfactants used included nonionic (C12E6), anionic (Aerosol-OT), and zwitterionic (tetradecyldimethylamine oxide). In some experiments inversion occurred because a lipophilic surfactant was converted to a hydrophilic surfactant, e.g., a double-chain phospholipid to two single-chain surfactants.

30/11/2000
IIT Bombay Seminar on vacuum systems for chemical technology by Dr. Donovan Collins, specialist in chemical vacuum technology, Edwards BOCE, London Product quality and yield improvements, reductions in operating costs - especially energy costs and the compliance with the ever restrictive national and international environmental regulations, particularly with respect to waste water and effluent disposal require chemical processes to be reappraised. More and more processes are, therefore, operated under reduced and ever reducing pressure conditions. Several different equipment have been used for vacuum production in CPI. The paper discusses the various vacuum-producing devices being used and introduces the range of dry pumping technologies available commercially today. The key benefits of dry vacuum pumping are that they deliver clean vacuum at high process and energy efficiencies and practically negligible effluent generation.

Feb. to April, 2000, U.D.C.T. Refresher Course On Colloid and Interface Science
* Thermodynamics of plane interfaces, Interfaical Equation of state approach. Themodynamics of curved interfaces, young-Laplace Equation.

* Kelvin equation and its applications, Contact angle hysteris. Measurement methods for surface and interfacial tension, contact angle. Static, dynamic methods Colloidal materials: Preparation and characterzation techniques, DLVO theory of stability of colloids., Rheology of colloidal materials.

* Definition, Classification of surfactants, concept of HLB and other related concepts, Micelle formation, Solution thermodynamics. Chemistry of synthesis of surfactants. Macroemulsions: Formation, Stability, Rheology of emulsions, Applications of emulsions, Applications, of suspensions.

* Visicles, Reverse micelles, Mixed surfactant systems, Microemulsions, Applications. Soap, Detergent, shampoos, etc. formulations. Characterization techiques for surfactants in solution, suspension, emulsion and foams. Hydrotopy: theory and applications. foam stability and foamability, applications.

Date-Time / Venue	Particulars	Abstract
Feb 20, 2007	Dr.Prakash Mehta, Zydex	Emerging Nano-Technologies in water proofing
Nov 19, 2005 UICT	One Day Seminar on Instrumentation in Colloid and Interface Science Report
Sept 27, 2005	Seminar by Prof Sandip Roy, IIT-B	Roll up of oil drops during detergency, UICT 5pm
11-13/12/03 UICT	National Conference on Dec. 11-13, 2003, UICT, Matunga
25/07/03 IIT-Bombay, Powai	1. Lecture by Dr Panda on July 25th, 2003 4 pm, IIT, Powai
20/0103 UICT	Refresher course in Coloid Interface Science
17/12/02 Baroda	Two day seminar
13/12/02 UICT	Seminar by Dr. Mohan Rao
19/08/02 UICT	Seminar By Dr. Pradip	The development of tailor-made additives, designed for enhancing the performance of specific particulate processing unit operations is vital for the minerals and materials processing industry. Some examples include design of highly efficient dispersants for paints, pigments and advanced ceramics applications, controlling the wettability/compatibility of dispersed phase through the application of suitable additives for applications in mineral processing (selective flotation reagents and tailor made flocculants), textiles (finishing agents), cements (grinding aids, super-plasticizers), water treatment (corrosion inhibitors) and fertilizers/alumina production (crystal modifiers). Both the choice of the functional group as well as selection of an appropriate molecular architecture (aliphatic, aromatic or polymeric chains) depending on its end use, determines its efficacy for a given application. Recent research efforts including those of our group clearly indicate a definite paradigm shift from conventional trial & error methodologies to a rational, robust approach to design/selection of performance chemicals/ reagents/ additives, tailor made for specific applications. Two important components of this novel paradigm of reagents design are: (a) identification of molecular recognition mechanisms underlying selective adsorption at solid/solution interfaces and (b) development/validation of appropriate molecular modeling techniques/ tools for screening/ shortlisting the promising molecules based on theoretical computations alone, for a target application. The utility and power of our molecular modeling based design approach is illustrated in this presentation with the help of a few selected examples drawn from our own work. The case studies include design of three family of reagents belonging to phosphonic acids, carboxylic acids and hydroxamic acids respectively, in order to control the wettability of calcium minerals (fluorite, calcite and fluorpatite); design of phosphonic acid based corrosion inhibitors; optimization of the molecular architecture of carboxylic acid derivatives as crystal growth modifiers & also as dispersants for titania based paints and design of appropriate dispersants for alumina and zirconia ceramic suspensions.
Oct. 23rd, 2002 UICT, Mumbai 400 019	Seminar By Prof. Heinz Hoffman
Dec. 21, 2001 , 2001, Venue: ICI R&T Centre Vashi Time: 3:30 p.m.	Seminar on: MICELLAR KINETICS AND ITS SIGNIFICANCE TO VARIOUS TECHNOLOGICAL PROCESSES	MICELLAR KINETICS AND ITS SIGNIFICANCE TO VARIOUS TECHNOLOGICAL PROCESSES Dr. Dinesh O. Shah, Director of the Center for Surface Science and Engineering, and The First Charles A. Stokes Professor of Chemical Engineering and Anesthesiology, University of Florida,Gainesville, Florida, USA (E-Mail: shah@che.ufl.edu) Using various techniques such as P-Jump, Stopped-Flow etc, the relaxation of micellar solutions were determined. For sodium dodecyl sulfate solutions, it was shown that it had the highest relaxation time at 200 mM. This concentration is about 25 times larger than the CMC. It was further shown that the foamability was minimum, wetting time maximum, emulsion size maximum, and detergency maximum at 200 mM SDS concentration. Thus, it was concluded that the micelle stability is a rate limiting factor in many technological processes where micelle break up is needed to release more monomers to occupy the newly created surface. Molecular aspects of engineered mixed micelles and their possible technological applications will be discussed during the lecture.
21/11/2000 UDCT	One Day Seminar on: Instrumental Methods in Colloid and Interface Science	The field of colloid and interface science is growing fast both in industrial applications as well as in scientific understanding and the role of instrumentation in bridging the gap in between is undeniable. It is always a great help to share experiences of the use of these instruments for various purposes and learn from these; especially when the information is coming from scientists who have first hand experience with the instruments. This seminar is being organised with the aim of bringing various instrument users together on a common platform.
25/11/2000 CAD Center	Lecture by Clarence A. Miller Department of Chemical Engineering, Rice University Houston, Texas, 77251-1892, USA.	Drops having diameters of order 100 m and containing various combinations of oils, surfactants, and in some cases alcohols were injected into water or aqueous salt or buffer solutions. The resulting dynamic behavior was observed by videomicroscopy. Spontaneous emulsification yielding oil droplets a few microns in diameter was seen in a variety of systems when diffusion and/or chemical reaction caused inversion of the drop from an oil-continuous to a water-continuous phase, leading to local supersaturation in oil. Surfactants used included nonionic (C12E6), anionic (Aerosol-OT), and zwitterionic (tetradecyldimethylamine oxide). In some experiments inversion occurred because a lipophilic surfactant was converted to a hydrophilic surfactant, e.g., a double-chain phospholipid to two single-chain surfactants.
30/11/2000 IIT Bombay	*Seminar on vacuum systems for chemical technology by Dr. Donovan Collins, specialist in chemical vacuum technology, Edwards BOCE, London*	Product quality and yield improvements, reductions in operating costs - especially energy costs and the compliance with the ever restrictive national and international environmental regulations, particularly with respect to waste water and effluent disposal require chemical processes to be reappraised. More and more processes are, therefore, operated under reduced and ever reducing pressure conditions. Several different equipment have been used for vacuum production in CPI. The paper discusses the various vacuum-producing devices being used and introduces the range of dry pumping technologies available commercially today. The key benefits of dry vacuum pumping are that they deliver clean vacuum at high process and energy efficiencies and practically negligible effluent generation.
Feb. to April, 2000, U.D.C.T.	Refresher Course On Colloid and Interface Science	* Thermodynamics of plane interfaces, Interfaical Equation of state approach. Themodynamics of curved interfaces, young-Laplace Equation. * Kelvin equation and its applications, Contact angle hysteris. Measurement methods for surface and interfacial tension, contact angle. Static, dynamic methods Colloidal materials: Preparation and characterzation techniques, DLVO theory of stability of colloids., Rheology of colloidal materials. * Definition, Classification of surfactants, concept of HLB and other related concepts, Micelle formation, Solution thermodynamics. Chemistry of synthesis of surfactants. Macroemulsions: Formation, Stability, Rheology of emulsions, Applications of emulsions, Applications, of suspensions. * Visicles, Reverse micelles, Mixed surfactant systems, Microemulsions, Applications. Soap, Detergent, shampoos, etc. formulations. Characterization techiques for surfactants in solution, suspension, emulsion and foams. Hydrotopy: theory and applications. foam stability and foamability, applications.