Osmosis Course

Lesson 1 • Semipermeable Membranes

Covers the structural properties that make a membrane selectively permeable to water. Students connect membrane composition to its functional role in osmotic processes.

Lesson 2 • Water and Solute Behaviour

Examines how water molecules and dissolved solutes interact at the molecular level. Understanding these interactions explains why water moves towards higher solute concentrations.

Lesson 3 • Osmotic Pressure Concept

Introduces osmotic pressure as the measurable force opposing net water movement. Students calculate osmotic pressure using the van't Hoff equation.

Lesson 4 • Tonicity and Solution Classification

Distinguishes hypotonic, isotonic, and hypertonic solutions and predicts cell behaviour in each. This classification system is applied throughout biological and industrial contexts.

Lesson 1 • Gibbs Free Energy and Osmosis

Gibbs free energy changes determine the spontaneity of osmotic water transfer. Students calculate free energy changes for osmotic processes under varying conditions.

Lesson 2 • Donnan Equilibrium and Charged Solutes

Charged macromolecules create unequal ion distributions across membranes, modifying osmotic pressure. Students analyse Donnan effects in biological and industrial membrane systems.

Lesson 3 • Water Potential Framework

Water potential integrates pressure, solute, and gravitational components to predict water movement direction. Students use this framework to solve osmotic flow problems.

Lesson 4 • Chemical Potential of Water

Chemical potential provides a rigorous thermodynamic basis for osmotic equilibrium conditions. Students relate chemical potential to measurable solution properties.

Lesson 1 • Facilitated Transport Pathways

Carrier proteins and channel proteins accelerate solute movement without energy expenditure. Students compare kinetics of facilitated transport to simple diffusion.

Lesson 2 • Passive Diffusion Across Membranes

Passive diffusion follows Fick's laws and requires no energy input. Students calculate diffusive flux and identify factors that limit passive permeability.

Lesson 3 • Osmotic Water Flux Equations

The Kedem-Katchalsky model quantifies coupled water and solute flux across membranes. Students apply reflection coefficients and hydraulic conductivity to predict osmotic flow rates.

Lesson 4 • Membrane Permeability Measurement

Experimental methods quantify membrane permeability to water and solutes. Students design and interpret stopped-flow, osmotic swelling, and tracer flux assays.

Lesson 1 • Cell Volume Regulation

Cells use ion transporters and organic osmolytes to defend volume against osmotic stress. Students trace regulatory volume increase and decrease pathways in animal cells.

Lesson 2 • Renal Osmotic Concentration Mechanisms

The kidney concentrates urine through a countercurrent multiplier system driven by osmotic gradients. Students map solute and water movement across nephron segments.

Lesson 3 • Osmosis in Plant Cells

Plant cell turgor pressure results from osmotic water uptake against a rigid cell wall. Students calculate turgor pressure and explain plasmolysis and wilting phenomena.

Lesson 4 • Osmoregulation in Diverse Organisms

Osmoconformers and osmoregulators employ distinct strategies to survive varied osmotic environments. Students compare marine, freshwater, and terrestrial osmoregulatory adaptations.

Lesson 1 • Thermodynamic Basis of Reverse Osmosis

Reverse osmosis requires applied pressure exceeding osmotic pressure to force water through a membrane. Students calculate minimum energy requirements and net driving pressure.

Lesson 2 • Concentration Polarisation and Fouling

Solute accumulation at the membrane surface reduces flux and accelerates fouling. Students apply mass transfer models to predict and mitigate concentration polarisation.

Lesson 3 • Reverse Osmosis Membrane Materials

Thin-film composite polyamide membranes dominate modern reverse osmosis applications. Students compare membrane chemistries, rejection rates, and fouling susceptibility.

Lesson 4 • System Configuration and Module Design

Spiral-wound and hollow-fibre modules optimise surface area and pressure management. Students evaluate module configurations for specific feed water quality and recovery targets.

Lesson 1 • Pressure-Retarded Osmosis for Energy

Pressure-retarded osmosis converts salinity gradient free energy into hydraulic power. Students calculate theoretical power density and identify practical efficiency losses.

Lesson 2 • Forward Osmosis Process Fundamentals

Forward osmosis uses a concentrated draw solution to pull water through a membrane without applied pressure. Students compare forward osmosis flux, rejection, and energy profiles to reverse osmosis.

Lesson 3 • Draw Solution Selection and Recovery

Draw solution properties determine osmotic driving force, water flux, and regeneration feasibility. Students evaluate thermally, magnetically, and electrically recoverable draw solutes.

Lesson 4 • Applications of Forward Osmosis

Forward osmosis is applied in wastewater treatment, food concentration, and pharmaceutical processing. Students match process conditions to application requirements and evaluate commercial viability.

Lesson 1 • Environmental Impact and Sustainability

Brine discharge, energy consumption, and chemical use create environmental burdens in osmotic processes. Students apply life cycle thinking to minimise ecological impact of membrane systems.

Lesson 2 • Wastewater Treatment and Water Reuse

Osmotic membrane bioreactors and reverse osmosis polishing achieve high-quality water reuse. Students evaluate treatment trains for municipal and industrial wastewater streams.

Lesson 3 • Osmosis in Food Processing

Osmotic dehydration and membrane concentration preserve food quality while reducing energy use. Students design osmotic dehydration processes and select appropriate osmotic agents.

Lesson 4 • Pharmaceutical and Biomedical Applications

Osmotic drug delivery systems and dialysis membranes rely on precise osmotic control. Students analyse osmotic pump design and dialysate composition for clinical applications.

Lesson 1 • Nanostructured and Biomimetic Membranes

Carbon nanotubes, graphene oxide, and aquaporin-based membranes offer ultra-high water permeability. Students compare permeability-selectivity trade-offs in nanostructured membrane architectures.

Lesson 2 • Osmotic Energy Harvesting at Scale

Reverse electrodialysis and pressure-retarded osmosis compete as salinity-gradient energy technologies. Students evaluate techno-economic feasibility and infrastructure requirements for grid-scale deployment.

Lesson 3 • Osmotic Processes in Biotechnology

Osmotic stress engineering enhances microbial production of compatible solutes and biofuels. Students design fermentation conditions that exploit osmotic responses for metabolite overproduction.

Lesson 4 • Computational Modelling of Osmotic Systems

Molecular dynamics and continuum models predict membrane transport and osmotic behaviour at multiple scales. Students interpret simulation outputs and validate models against experimental data.