SC/0003 - PHYSICAL CHEMISTRY OF INTERFACES 1
Academic Year 2021/2022
Free text for the University
ANDREA SALIS (Tit.)
- Teaching style
- Lingua Insegnamento
|[60/69] CHEMICAL SCIENCES||[69/00 - Ord. 2019] PERCORSO COMUNE||6||48|
KNOWLEDGE AND UNDERSTANDING:
During the course the students will acquire the following knowledge:
Role of the interphases in real systems, in particular the stability, the phenomenological aspects, and specific interactions at the molecular level. In addition, students will gain basic knowledge about the phenomena of self-association of surfactants and their role in the preparation of complex formulations .
APPLYING KNOWLEDGE AND UNDERSTANDING:
The student will acquire the theoretical knowledge and the practical skills to characterize and understand the evolution of colloidal, nano-structured, and macromolecular systems, and predict their stability.
The course is focused on developing the knowledge and ability to interpret data in a critical way to frame every argument in its scope, knowing then find the appropriate way for its consideration, or resolution.
The course aims to develop the ability to present in a concise and comprehensive way a scientific subject both in written (scientific report) and oral (seminars) form also through the use of computer media (PowerPoint presentations).
The concepts and knowledge learned by the students will give them the ability to understand the behavior of real (colloidal, nanophasic and biological) systems and of emerging scientific issues (nanoscience and nanotechnology), and the curiosity to explore these subjects by individual study on specialized texts and scientific papers.
Students must have a good level of preparation in the following subjects: a) mathematics and physics; b) energy aspects related to the state of matter, chemical thermodynamics; c) kinetics; d) catalysis; e) biochemistry
• Interphases; Colloids and Surfaces; Nanostructures in the fluid phase.
• Physical chemistry of real systems. Phenomena and parameters to describe solid-gas, solid-liquid, liquid-gas, liquid-liquid interfacial properties. Phenomenological aspects as discontinuity at interphases, superficial excess, surface tension, adsorption phenomena, phenomena of adhesion, wettability and spreading. Surface tension and Detergency
• Intermolecular Forces: Electrical double layer, van der Waals forces, DLVO theory.
Rheological properties: Brownian motions in different types of fluids: viscosity and kinetic aspects. Diffusion coefficient, Stokes-Einstein equation, intermolecular forces role in stability of kinetically stable systems. Role of charged interphases in the phenomena of coagulation, flocculation, or stability of disperse systems (kinetic stability)
• Liophilic and Liophobic Colloids. Surfactants. Self-assembly phenomena in thermodynamically and kinetically stable systems.
• Electrokinetic phenomena, zeta potential, Henry equation, Hückel and Smoluchowsky approximations.
• The Hofmeister series: ion specific effects in chemical and biological systems. Kosmotropic and chaotropic ions. Collins’ law of matching water affinity. Ninham’s theory of ion dispersion forces.
The course includes 48 hours of lectures during which the various topics will be presented using computer visual media. Some visits will be organised in research laboratories for direct visualization of phenomenological and morphological aspects of nano-systems and nanoparticles. The course includes lectures and at least three intermediate verification tests, based on multiple-choice answer quiz and exercises, requested for the final evaluation.
Verification of learning
The assessment consists of two written tests with numerical exercises, interpretation of graphs, open and multiple choice questions.and eventually an oral interview.
The knowledge of the topics of the course, the ability to link between different topics, the expressive capacity, the use of appropriate terminology, the ability to synthesize, will be evaluated.
Final Judgement. The final mark takes into account several factors:
Quality of knowledge, ability, skills possessed and:
a) appropriateness, accuracy and consistency of knowledge
b) appropriateness, accuracy and consistency of skills
c) appropriateness, accuracy and consistency of skills.
a) expressive capacity;
b) Proper use of the specific language of the discipline;
c) logical and consequential capacity in the fitting of the contents;
e) Ability to connect different topics by finding common points and establishing a coherent overall design, that is taking care of the structure, organization and logical connections to the exhibition's speech;
f) synthesis capacity including through the use of its symbolism of matter and the graphic expression of ideas and concepts, for example in the form of formulas, diagrams, equations.
Availability to exchange and interaction with the teacher during either the test correction or the oral exam.
a) critical spirit;
b) self-assessment ability.
Consequently, the judgment can be:
30 cum laude: Implementation of the tasks including numerical exercises and themes is correct and widely described in detail. Rigorous solution methods have been applied. The oral exposure was particularly rich and precise and makes use of critical and personal insights. Skills, their independent judgment, communication skills and ability to learn are definitely appropriate in every single detail.
28-30: Implementation of the tasks including numerical exercises and themes is correct and widely described in detail. Rigorous solution methods have been applied. The oral exposure was accurate. Skills, their independent judgment, communication skills and ability to learn are appropriate in every single detail.
25-27: Implementation of the tasks including numerical exercises and themes is correct and described in detail. Skills, their independent judgment, communication skills and learning skills are good though not particularly rich in detail.
22-24: Implementation of the tasks including numerical exercises is suffering from easily identifiable careless mistakes (wrong signs, incorrect significant digits) and sometimes the exercises and topics are not complete but still next to the solution. Skills, their independent judgment, communication skills and learning skills are adequate despite some uncertainty.
18-21: Implementation of the tasks include numerical exercises is suffering from some errors (mostly due to distraction) and sometimes the exercises and topics are not complete but still set correctly. Skills, their independent judgment, communication skills and ability to learn are sufficient.
Insufficient: Serious conceptual errors or conduct. Some exercises or subjects are not even done or understood.
- "Physics and Chemistry of Interfaces", Hans-Jürgen Butt, Karlheinz Graf, Michael Kappl, Wiley-VCH 2003.
- "Principles of Colloid and Surface Chemistry", Hiemenz, Rajagopalan Dekker, 3rd edition.
- "Intermolecular and Surface Forces", J. Israelachvili, Acad. Press 3rd ed., 2011
- "Chimica Fisica", P.W. Atkins - De Paula, Zanichelli
Besides the suggested text books, the teacher provides the following additional material:
- Pdf files of the power point presentations used during the lectures.
- solved numerical exercises