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[Translate to en:] Studentische Hilfskräfte

[Translate to en:] Die Holzforschung München sucht regelmäßig nach neuen studentischen Hilfskräften zur Mitarbeit bei Forschungsprojekten. Bei Interesse und Fragen wenden Sie sich bitte an Herrn Volker Schmidt.

Graduation work

Research Area Chemistry of Raw Material and Products

[BSc /MSc] The contact angle measurement of adhesives on the native and extract-free wood surfaces Background:

 Background::

Bonding is a key technology in many areas, and reliable wood-adhesive bonds are crucial for future wood-biomass utilization. For a good quality of the bonding, the adhesives need to form a contact with the wood surface at the molecular level. This process is highly related to the surface energies of the wood and adhesives.

Although extractable wood components (extracts) represent a minor fraction of wood, the polar/non-polar components within their chemistry might have an influence on the wood surface energy therefore also on the bonding quality.

The contact angle (Ɵo) measurement is a widely used technique for evaluating the surface energy by means of the shape of a drop placed on a surface (Fig.1a). More specifically, the concept of the contact angle gives a definition to the notion of wettability on the surface (Fig.1b).

Topic:

In the scope of this study, the wettability properties of both water and adhesives (e.g. MUF, PUR etc.) will be measured on the unmodified wood surfaces from different species (e.g. spruce, Douglas fir, beech, chestnut etc.) but also extract free wood surfaces to which several extraction procedures are applied (e.g. hot/cold water, organic solvent extraction). Moreover, how extracts vary between different species will be investigated.

Reference

[1] Relation of the Equilibrium Contact Angle to Liquid and Solid Constitution. W. A. ZISMAN. U. S. Naval Research Laboratory. Washington 25

Contact:

Dr. Merve Özparpucu 

Dr. Elisabeth Windeisen-Holzhauser

Figure 1. a)Contact angle measurement device (Easy drop, Krüss company), b) Concept of contact angle (Ɵo) which occurs as the result of the mechanical equilibrium of a drop resting on a plane solid surface under the action of three surface tensions; γLV at the interface of the liquid and vapor phases, γSL at the interface of the solid and the liquid, and γsv at the interface of the solid and vapor [1].

Research Area Resource Flow Management

Graduation works

We are constantly able to offer interesting project topics for BSc and MSc theses with a focus on material flow analysis, life cycle assessment, sustainability assessment concerning renewable resources, especially wood/wood products. Please approach us with any questions you might have!

Contact:

Prof. Dr. Gabriele Weber-Blaschke

[MSc] Further Development of the rAPP (Resource-App) Concerning Conception and Resource Data

Problem Statement:

  • Increasing consumption and the global availability of goods result in high resource demandand environmental burdens.
  • Since some years, consumers can analyze their greenhouse gas emissions caused by theirpersonal consumer behavior by the means of provided online-programs (often termed as„CO2-Calculator“ resp. „Carbon/Carbon Footprint Calculator“). These existing calculators aremostly based on questionnaires related to the consumption behavior.
  • In contrast, the resource-App (short: rAPP) developed by Projekt 360grad mensch ascontinuative tool for mobile devices directly collects the individual consumption data duringshopping par EAN-Codes and links that information with resource and environmental dataprovided on servers hosted by Projekt 360grad mensch. Thus, the individual resourcedemands and environmental impacts can be calculated directly during shopping.

Your Task:

  • Support of the further development of rAPP regarding functionality and resource data.
  • The objective is to provide a tool for resource accounting which meets high user interest andraise people’s awareness of resource issues.
  • First steps are the analysis of respective, already existing tools, data sources and calculationmethods concerning resource demands and environmental impacts in general and forselected products and suggestions for specific implementations in rAPP.

Conditions:

  • Start: immediately possible.
  • Own availability of a working place with PC and telephone and a smartphone favorable.
  • Cooperation with 360grad mensch gGmbH, Traunreut.

Prerequisites:

  • Basic knowledge in environmental and life cycle assessment.
  • Interest in the utilization and development of Apps.

Scientific Supervision:

Prof. Dr. Gabriele Weber-Blaschke

Project-Contact Person:

Josef Winkler (Geschäftsführer), 360grad mensch gGmbH,

Traunring 8, 83301 Traunreut, Telefon: 08669/909452,

E-Mail: josef.winkler@360grad-mensch.de, http://www.360grad-mensch.de/

Material Science and Engineering

Wood Bioprocesses

Internship