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Preparat wspomaga oczyszczanie autolityczne rany z martwicy oraz stwarza odpowiednie środowisko gojenia. To do all the practical work takes about 30 minutes. Distilled water — if distilled water is not available, tap water can be used but the results are not as spectacular. CPD How to teach atmospheric chemistry at 14—16 TZ By Martin Bluemel Use these guiding questions to guarantee student understanding of this tricky topic. The hair gel experiment is a good quick introduction to hydrogels, while the nappy experiment is more detailed. By Kristy Turner. For example, their volume in different amounts of water or in different salt concentrations can be measured. By Kirsty Patterson. Our Experts won't do the work for you, but they will make suggestions and offer guidance if you come to them with specific questions. View Site Map. Disposable nappy — Pampers Baby Dry ® nappies work well, but any ultra-absorbent disposables should be fine. Some expected observations are given below. This causes the polymer to collapse in on itself again. It is a good idea to ask students to make detailed observations of each part of the experiment.

Level years years years. Use this practical to investigate how solutions of the halogens inhibit the growth of bacteria and which is most effective. Biuro Obsługi Klienta Drogerii Internetowej: pn. Grade Levels. It absorbs about cm 3 of distilled water giving a very viscous mixture. Pour them into the large beaker and add about cm 3 of distilled water. Our team of volunteer scientists can help. Do not do this roughly or you will lose your product and put a lot of dust and fluff into the air. If the ionic concentration of the solution is increased — eg by adding salt — the positive ions attach themselves to the negative sites on the polymer, effectively neutralising the charges.

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Hair gel — the cheaper and nastier the better. Investigate hydrogels as polymeric smart materials in this series of activities using nappies and cheap hair gel. Wear eye protection throughout. Disposable nappy — Pampers Baby Dry ® nappies work well, but any ultra-absorbent disposables should be fine. By Kirsty Patterson. No comments yet. Summary Areas of Science. Gently sprinkle salt from a spatula over the hair gel. This activity can be used to enhance the teaching of ionic and covalent bonding, or hydrogels can be considered as an interesting polymer as well as an example of a smart material. Wear eye protection for the next step.

Diaper Science: How Hydrogels Absorb Water | Science Project

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• This has two effects.
• First, the negative charges repel each other and the polymer is forced to expand.
• Investigate hydrogels as polymeric smart materials in this series of activities using nappies and cheap hair gel.
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In association with Nuffield Foundation. Investigate hydrogels as polymeric smart materials in this series of activities using nappies and cheap hair gel. In this pair of experiments, students explore the properties of hydrogels used in commonly available products — in this case, disposable nappies and cheap hair gel. The practical work is fun to do, and the results are sudden and dramatic. To do all the practical work takes about 30 minutes. The hair gel experiment is a good quick introduction to hydrogels, while the nappy experiment is more detailed. If time is available, it is worth considering combining this practical with this experiment exploring hydrogels in the context of plant water storage crystals. This activity can be used to enhance the teaching of ionic and covalent bonding, or hydrogels can be considered as an interesting polymer as well as an example of a smart material. Hydrogels are smart materials because they change shape when there is a change in their environment — in this case it is the change in the concentration of ions. Students need to have some knowledge and understanding of ionic and covalent bonding, reversible reactions, and acids and bases to understand what is happening. Hydrogels are polymers that can retain many times their own weight in water. They are often polymers of carboxylic acids that ionise in water, leaving the polymer with several negative charges down its length. This has two effects. First, the negative charges repel each other and the polymer is forced to expand. Secondly, polar water molecules are attracted to the negative charges. This increases the viscosity of the resulting mixture still further as the polymer chain now takes up more space and resists the flow of the solvent molecules around it. The polymer chain of a hydrogel, from which hydrogen atoms are removed in water to leave negative charges along the length of the structure. The polymer is in equilibrium with the water around it, but that equilibrium can be disturbed in a number of ways. If the ionic concentration of the solution is increased — eg by adding salt — the positive ions attach themselves to the negative sites on the polymer, effectively neutralising the charges.

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However, they do lend themselves very well to a range of investigative practical work. Dodaj do ulubionych. Pampers hydrogels put the nappy in the bag, zip it up and manipulate it until all the hydrogel is extracted and then proceed as per the directions.

MAKING FERTILIZERS OUT OF DIAPERS!? (HYDROGEL)