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Auteur: Tjerk Watt

Potato proteins in complex coacervates

Potato proteins in complex coacervates

Coach: Dr. Saskia Lindhoud, Nanobiophysics Complex coacervates are liquid phases which form when oppositely charged polyelectrolytes are mixed under the right conditions. Fig. 1 is a schematic diagram of the different phases which form when polyelectrolytes are mixed as a function of their composition (x-axis) and the salt concentration (y-axis). It can be seen that macroscopic complex coacervates only form around charge stoichiometry and above a certain salt concentration. Fig. 1. Stability diagram of polyelectrolyte complexes as a function of…

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High-throughput screening of factors influencing polyelectrolyte complexation

High-throughput screening of factors influencing polyelectrolyte complexation

Polluted drinking water is a timeless, global problem. Water purification is typically done via membranes, separating undesired elements from the drinking water. However, the membrane themselves are produced using (environmentally) harmful chemicals. For this reason a new technique to produce membranes using polyelectrolytes is being investigated. Polyelectrolytes are polymers with charged monomeric units. Mixing oppositely charged polyelectrolytes results in interaction and the formation of (solid) polyelectrolyte complexes. Chemically, biomolecules such as proteins or DNA have properties similar to polyelectrolytes. These…

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Incorporation of Green Fluorescent Protein into polyelectrolyte complexes.

Incorporation of Green Fluorescent Protein into polyelectrolyte complexes.

Polluted drinking water is a timeless, global problem. Water purification is typically done via membranes, separating undesired elements from the drinking water. However, the membrane themselves are produced using (environmentally) harmful chemicals. For this reason a new technique to produce membranes using polyelectrolytes is being investigated. Polyelectrolytes are polymers with charged monomeric units. Mixing oppositely charged polyelectrolytes results in interaction and the formation of (solid) polyelectrolyte complexes. Chemically, biomolecules such as proteins or DNA have properties similar to polyelectrolytes. These…

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Can alpha synucleine form classical micelles?

Can alpha synucleine form classical micelles?

The biological function of the intrinsically disordered protein alpha synuclein is unknown. What is known, is that the protein plays an important role in the formation of Lewy bodies in Parkinsons Disease. Intrinsically disordered proteins can be regarded as polymers consisting of groups with different physical chemical properties. Which physical chemical interactions dominate, depends on the environment. We have strong indications that this protein can behave like a neutral hydrophilic- charged diblock copolymer. There are indications that the protein can…

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Catalytic Conversion of Bio-ethanol to Polyhydroxyalkanoates Building Blocks: Selective Oxidation of Crotonaldehyde

Catalytic Conversion of Bio-ethanol to Polyhydroxyalkanoates Building Blocks: Selective Oxidation of Crotonaldehyde

Plastics play a key role in the creation of a myriad of materials, products, and technologies that have contributed to the development and progress of society. With continuous growth for more than 50 years, global production of plastics rose to 322 million tons in 2015.1 Currently, 99% of all plastics are derived from non-renewable resources such as petroleum and natural gas.2–4 In the long-term the current use of plastics is not sustainable due to its dependence on non-renewable fossil fuels…

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Stimuli-responsive polymers for regulated catalytic materials: effect of polymer functionality on the regulation mechanism

Stimuli-responsive polymers for regulated catalytic materials: effect of polymer functionality on the regulation mechanism

There has been an increasing interest in tailored catalysts with stimuli-responsive polymers, to improve the performance of the catalyst. Catalyst performance can be improved through the use of stimulus responsive polymers, as they can expose or hide the metal site depending on the environmental changes, such as temperature, light or pH. Temperature responsive polymer brushes will be coated on silicon surfaces containing metal nanoparticles and the effect of temperature, and hence brush conformation, on the chemisorption of a probe molecule…

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Stimuli-responsive polymers for regulated catalytic materials: effect of brush growth on the regulation mechanism

Stimuli-responsive polymers for regulated catalytic materials: effect of brush growth on the regulation mechanism

Stimulus responsive polymers undergo reversible physical and chemical changes in response to environmental stimuli such as temperature or pH. Catalyst performance can be improved through the use of such polymers, as they can expose or hide the metal site. Temperature responsive polymer brushes will be coated on silicon surfaces containing metal nanoparticles and the effect of temperature, and hence brush conformation, has on the chemisorption of a probe molecule will be studied. Such polymers undergo a hydrophilic to hydrophobic change…

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Electrical energy to value added fuel: A Plasma-Catalytic approach.

Electrical energy to value added fuel: A Plasma-Catalytic approach.

The increasing share of intermittent renewable electricity production leads to operational challenges in the electric power sector. Storage will be needed to ensure an efficient and reliable operation of the electric power system. Power to Gas (P2G) technology can use this excess electricity to produce renewable H2 via water electrolysis. Here, at CPM, we are developing efficient catalysts to covert renewable H2 into CH4 using water gas shift and methanation reaction. We have developed Ru/CeO2 and Ni/CeO2 catalysts so far,…

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Investigation of the stability of partial hydrophilic (Pd/γ-Al2O3) in the aqueous phase

Investigation of the stability of partial hydrophilic (Pd/γ-Al2O3) in the aqueous phase

Nitrate (NO3–) is introduced in drinking water sources from agricultural, household and industrial waste streams. High concentration of nitrate in drinking water is harmful as it reduces to nitrite (NO2–) in the human body. Presence of nitrite in human body is extremely toxic as it is reported to cause cancer or blue baby syndrome. Therefore the removal of nitrate is necessary from drinking water. The nitrate and nitrite removal from water has been attempted using different techniques, including catalytic hydrogenation….

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Metal Extraction using ionic liquid [P8888][Oleate], Evidence of Hofmeister effect

Metal Extraction using ionic liquid [P8888][Oleate], Evidence of Hofmeister effect

(location: Wetsus, Leeuwarden) Background: The water purification companies, chemical and mining industries produce numerous aqueous streams polluted with valuable (heavy) metal salts. Economically and technically, it is challenging to remove these impurities from the water before reuse or discharge. Furthermore, it is challenging to selectively separate the different metal salts from each other in order to recover them from the water at a high value. The idea in this proposal is to understand the affinity of metal ions to transfer…

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