Rheology of Dispersions: Thickeners and Gels Principles and Applications

Transcription

1 Celebrating 50 YEARS Rheology of Dispersions: Thickeners and Gels Principles and Applications October 4-5, 2017 New Brunswick, NJ Directed by: Dr. Tharwat F. Tadros, Independent Consultant Course Topics Include: Viscoelastic Behavior Rheological Measurements Stable and Unstable Systems course description This course on rheology of dispersions, principles and applications, deals with the rheology of the solid/liquid (suspensions) and liquid/liquid (emulsion) types, rheology of thickeners and gels. The course will start with an introduction on the basic principles of rheology both steady state and oscillatory techniques. The various rhological parameters are clearly defined. Particular attention will be given to viscoelasticity and the models that can be used to describe it. The experimental techniques that can be applied for measurement of the various rheological parameters will be described. The course deals with concentrated systems and formation of three dimensional structural units. The rheology of concentrated suspensions, both stable and unstable systems is described. The rheology of emulsions will also be described with particular reference to interfacial rheology. Rheology modifiers of polymers, gels and particulate solids are described and their rhological behaviour is discussed. who should attend This intensive course is designed for research workers and professionals working with pharmaceuticals, paints, agrochemicals, personal care and cosmetics, printing inks, paper coatings, ceramics and detergents. It is targeted at, but not limited, to Formulation chemists Chemical Engineers Research workers engaged in rheology of dispersions in both industrial and academic laboratories. SAVE $200-Register & Pay by August 23

2 learning objectives Upon completion of this course, you will be able to: Explain the basic principles of rheology both steady state and viscoelastic behaviour Identify the techniques for measurement of rheology of dispersions and its application to industrial formulations in particular suspensions, emulsions and gels Describe the bulk properties of concentrated suspensions List the principles of rheology modifiers and apply them in industrial formulations course outline First Day 8:00 a.m.: Registration/Continental Breakfast 08:30 10:00 a.m.: Review of Learning Objectives/ Introduction and Definition of Rheology Steady State Principles: Definition of stress, strain and strain (shear) rate. Types of rheological behavior in simple shear. Models for flow behavior: Hooke s and Newtonian Models. Non-Newtonian flow and models that can be used to analyze the flow curves. Time effects during flow: Thixotropy and negative thixotropy. Elastic overshoot and rheopexy. 10:30 12:00 noon: Viscosity Measurements Steady State Regime: Measurement of viscosity as a function of shear rate. Capillary viscometers. Measurement of intrinsic viscosity for polymers. Capillary viscometers for non-newtonians. Rotational viscometers: Concentric cylinder (Couette), Cone and plate, Parallel plate. The vane rheometer. The Brookfield viscometer and calculation of shear rate. 1:00 2:30 p.m.: Viscoelastic Behavior: The Deborah number. Strain relaxation after sudden application of stress (creep). Analysis of creep curves. Viscoelastic liquids and viscoelastic solids. Mechanical models for describing viscoelasticity. Stress relaxation after sudden application of strain. Dynamic (oscillatory) techniques. Distinction between elastic, viscous and viscoelastic behavior. Analysis of oscillatory response for a viscoelastic system. Strain and oscillatory sweep for visoelastic liquid and viscoelastic solid. The cohesive energy density concept. 3:00 4:30 p.m.: Viscoelastic Measurements: Constant stress (creep) measurements and the procedure required. Stress relaxation measurement and its procedure. Oscillatory measurements. Shear modulus measurement. Commercially available instruments. 5:00 6:30 p.m.: Concentrated Systems and Formation of Three-Dimensional Structural Units: Volume fraction for dilute, concentrated and solid suspensions. Interparticle interaction: Hardsphere, Soft (electrostatic), Steric and van der Waals. Combination of interaction forces and theories of colloid stability. States of suspensions on standing and formation of three-dimensional structure units. Second Day 8:30 10:00 a.m.: Rheology of Suspensions: Dilute suspensions and the Einstein equation. Moderately concentrated suspensions with hydrodynamic interaction and the Bachelor equation. Rheology of concentrated suspensions and the Deborah number. Hard-sphere suspensions Systems with double layer repulsion Sterically stabilized suspensions Flocculated systems. Rheological behavior of each system. Influence of polydispersity on rheology of suspensions. Examples of each system and their rheological response. Weakly flocculated suspensions. Strongly flocculated suspensions and analysis of their flow curves. The elastic floc model. Fractal concept of flocculation. 10:30 12:00 noon: Rheology of Emulsions: Interfacial rheology: Interfacial tension and surface pressure. Interfacial shear viscosity and its measurement. Interfacial dilational elasticity and its measurement. Interfacial dilational viscosity and non-newtonian effects. Correlation of emulsion stability with interfacial rheology. Bulk rheology of emulsions and effect of disperse droplet viscosity. Experimental viscosity-volume fraction curves. Influence of droplet deformability on emulsion rheology. Viscoelastic properties of concentrated emulsions. 1:00 2:30 p.m.: Rheology Modifiers, Thickeners and Gels (Part 1): Classification of thickeners and gels. Definition of a gel. Rheological behavior of gels: Stress relaxation after sudden application of strain Constant stress (creep) measurement. Viscoelastic solid and viscoelastic liquid response for gels. Dynamic (oscillatory) measurement of gels. Classification of gels: Polymer gels Solid particulate materials. Gels based on liquid crystalline structures of surfactants. Polymer gels: obtained by chain overlap. 3:00 4:30 p.m.: Rheology Modifiers (Part 2):Gels produced by associative thickeners (hydrophobically modified water soluble polymers). Examples of associative thickeners and their rheological behavior. Influence of surfactants on the rheology of associative thickeners. Viscoelastic behavior of associative thickeners. Cross-linked gels. Particulate gels: based on long range repulsion or van der Waals attraction. Examples of swellable clays and finely divided silica. Organo clays (Bentones). Rheology modifiers based on surfactant systems. Assessment Opportunity Maximize Your Learning! Attend this course and its companion *Companion Course: Applied Surfactants October 2-3, 2017 New Brunswick, NJ Course ID #476 The Surfactants, Colloid and Interfaces principles as well as applications in formulations such as paints, pharmaceuticals, agrochemicals, cosmetics and paper coatings will be discussed. Classification of surfactants, the physical chemistry of their solutions and the principles of colloid stability will also be addressed. course director Dr Tharwat Tadros, consultant in applied fields of Colloid and Interface Science, was a senior research associate at ZENECA and the leader of fundamental and applied research in the field of colloid and interface science. He was a visiting Professor at Imperial College (London), Bristol and Reading Universities. Dr. Tadros research work is in various disperse systems, including surfactants, suspensions, emulsions, nano-emulsions, microemulsions, wetting spreading and adhesion and multi-phase formulations. He studies the properties of concentrated dispersions and their rheological behaviour. Application of polymeric surfactants for stabilization of emulsions, suspensions and nano-emulsions is one of his most recent research endeavours. Dr. Tadros is the author of more than 250 papers and has edited several books on polymer adsorption and dispersion stability, surfactants, solid/ liquid dispersions and polymers in colloid systems. He has written 4 books and a comprehensive text of applied surfactants. Emeritus editor of continued For assistance contact Customer Service at 1/ or us at: info@cfpa.com For More Information or to Register Go to

3 Colloids and Surfaces and an Honorary editor for Advances in Colloid and Interface Science, Dr Tadros is now editor for Wiley-VCH : Colloid and Interface Science Series and Topics in Colloid and Interface Science. He is an Editor-in-Chief of Encyclopaedia in Colloid and Interface Science (Springer, Germany). Former President of the International Association of Colloid Scientist, Dr. Tadros has been awarded two medals for distinguished research from the Royal Society of Chemistry, UK. recommended reading The Course Director recommends, as optional reading, the text Rheology of Dispersions by Tharwat Tadros, Wiley-VCH, Germany (2010). course location This course will be held in the New Brunswick, New Jersey area. Specific hotel information will be sent to you in your final confirmation package which will be ed to you approximately three (3) weeks prior to the course start date. Please note that participants must make their own hotel reservations; the cost of the hotel accommodations is not included in the course fee. We recommend that travel/hotel arrangements not be made until final confirmation package is received. Easy access to Manhattan, Trenton, NJ and Philadelphia, all less than 40 minutes accreditations/recertifications for this course The Center for Professional Advancement (CfPA) has been approved as an Accredited Provider by the International Association for Continuing Education and Training (IACET), Sunrise Valley Drive, Suite 350, Reston, VA In obtaining this approval, CfPA has demonstrated that it complies with the ANSI/IACET Standards which are widely recognized as standards of good practice internationally. CfPA is therefore authorized to offer IACET CEUs for its programs that qualify under the ANSI/IACET Standards. CEUs will be awarded for participation in CfPA s courses at the rate of.1 CEU per contact hour upon successful completion of the entire course and 70% accuracy in the required Learners Assessment. This course offers a total of 12 contact hours, or 1.2 CEUs. who we are Celebrating 50 Years The Center for Professional Advancement (CfPA) is the largest accredited technical training organization in the world with a curriculum of approximately 450 short courses in 15 industries including Pharmaceutical, Biotechnology, Medical Device, Chemical, Cosmetics, Food and more. Since our founding in 1967, we have successfully trained nearly a half million people worldwide in topics ranging from basic and introductory concepts to new advances and cutting-edge technology, and current U.S. and European regulations. CfPA courses are offered in a variety of formats to fit you or your company s training needs: In Person: Away from responsibilities, participants are immersed without distraction Client Site: Training at your site and at your convenience. For further information, please contact Client Site Programs: +1/ , ext or clientsite@cfpa.com Online: A convenient and cost-effective way to experience our accredited training. For a list of upcoming courses visit Virtual Attendee: Ideal for those who need the training but cannot attend in person. For more information visit: Virtual Recorded: Watch the recorded version of the Live In Person course. For more information visit: tuition Early Bird Save $200 (Must register and pay by August 23, 2017) $1970 Regular Tuition $2170 Group Discount: Register 2 or more from the same company, at the same time, for this course and receive a 10% discount off each registration. Tuition payable in US funds net of all charges includes continental breakfast, luncheon, breaks and course notes. Note: Payment is due 2 weeks prior to course or at time of registration. For assistance contact Customer Service at 1/ or us at: info@cfpa.com For More Information or to Register Go to

4 how to register Online: enter Course ID# into Search. Click Register Now button. Group Rates Available: Save 10% on 2 or more attendees. Call Customer Service at or info@cfpa.com Fill out the registration form and it to: info@cfpa.com registration form Rheology of Dispersions: Thickeners and Gels course id# 1025 /course offering# NJ1025 instructions: Please complete Registrant Information, Course Information and Payment Sections. Submit one form per individual registrant. o Check here if group discount applies (two or more enrollments for the same course, from the same company) All fields MUST be completed in order for registration to be accepted. registrant information Registration Type: o In Person Attendee o Virtual Attendee (Live or Recorded) Prefix: o Ms o Miss o Mrs o Mr o Dr o Prof First Name Last Name Designation (i.e.phd, Jr) Address Alternate (copy sent here as well) Title Your position in the organization is (please check one) o Corporate o Line Operational o Managerial/Supervisory o Staff o Consultant Your primary job function is (please check one) o Clinical Practice o Project Management o Design Engineering o Quality Control Assurance o Environmental Safety o Research & Development o Legal or Regulatory Affairs o Technical Information Services o Manufacturing & Operations o Training and/or Education o Marketing or Sales o Other *Primary industry that best describes your area of interest (select maximum of 2) o Analytical Chemistry o Biopharmaceuticals/ Biotechnology o Chemical/ Process Engineering o Clinical/ Non-Clinical o Cosmetics/ Personal Care/ Household Products o Environmental and Safety Technology o Mechanical/ Design Engineering o Medical Devices/ Diagnostics o Packaging Technology o Petroleum Technology o Pharmaceutical Technology o Technical/ Project Management o Food Technology

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