ABSTRACT
Germany 2Murmansk State Technical University, Murmansk, Russian Federation
Contents A. Introduction 373 B. Indirect Methods 374 1. Channel surface viscometer 374 2. Deep channel surface viscometer 377 3. Rotating knife-edge wall surface viscometer 384 4. Transient rotating cylinder apparatus 385 C. Direct methods 386 1. Torsion pendulum techniques 386 1.1. Sharp edge geometry for measurements at the air/liquid
interface 388
1.2. Biconical disk geometry for the liquid/liquid interface 396 2. Biconical disk coupled with a conventional rheometer 399 3. Oscillating disk 401 4. Oscillating needle 403 5. Oscillating ring 406 6. Other techniques 408 D. Interfacial shear rheology of protein layers 409 E. List of symbols 418 F. References 420
A. INTRODUCTION
In this chapter at first the basic concepts of shear interfacial rheology are discussed. A general introduction into two-dimensional rheology was already given in Chapters 1 and 2. The further aim is to give an overview of different measuring techniques to characterise the flow behaviour of interfaces under shear deformations, however, any detailed theoretical background of the different techniques is not given here. The description of different measuring techniques is mainly focused on torsion pendulum methods. Also some selected examples of experimental results are presented to demonstrate the application of different techniques to various chemical systems. The micro-rheological techniques which use optical or magnetic tweezers are given in Chapter 16.
