Experiments | Biomaterials

Focus: Explore wool-based biomaterials using natural binders and food waste, aiming to develop and test material recipes rather than finalized formulations. All compositions test unwashed wool and require zero or low amount of water and resources.
Expected Outcomes: A set of preliminary samples, recipes and process notes documenting current material behaviors, to be further refined through future testing and workshops.

Following experiments conducted during Phase 1 (wool with agar, alginate, mycelium, starch, resine), this part focuses on partially explored directions, aiming to develop more rigid composites using natural binders and creating wool papers.

Experiments conducted

Wool-based papers

Experiment 1: wool fibers and no water

Process

MATERIAL:

• 10 g wool fibers (test both washed and unwashed)
• 100 ml water
• 10g CMC 3%

• 5 g recycled paper pulp

• spatula

• balance
• bowl
• frame mold with fine mesh
• sponge
• absorben paper
• blender

STEPS:

• Prepare paper pulp: tear paper into small pieces, soak in warm water for 10–15 minutes and mash by hand until a fibrous pulp forms.
  

• Combine fibers: in a bowl, mix wool with CMC solution and incorporate water.
  

• Form the sheet: pour the mixture onto a fine mesh, level gently and press with a sponge to remove excess water.
  

• Drying: let the sheet dry flat on a cotton piece. Avoid direct heat or sudden temperature changes.
  

• Finishing; peel off the sheet carefully.
  

NOTES:
Paper pulp increases mechanical strength. CMC helps fibers stick, but too much gummy sheet.

Key observations
The test was not successful. During drying, the wool fibers separated from the paper pulp instead of bonding with it. As a result, the structure lost cohesion and broke once fully dried.

Experiment 2: wool, paper pulp and water

Process

MATERIAL:

• 10 g wool fibers (test both washed and unwashed)
• 2l water
• 10g of CMC 3% (optional)

• 50g g recycled paper pulp (in my case, a carton of 12 eggs I found at home)
  

• spatula

• balance
• bowl
• frame mold with fine mesh
• sponge
• blender

STEPS:

• Prepare paper pulp: blend the paper fiber with water until a uniform fibrous pulp is obtained.
  

• Prepare the vat: fill a large container with water and add the paper pulp, mixing gently.
  

• Add wool and binder: add the wool fibers and the CMC, stirring slowly to ensure even distribution.
  

• Form the sheet: immerse the frame mould into the mixture and lift it slowly, allowing excess water to drain while the fibers settle on the mesh.
  

• Couching and pressing: transfer the wet sheet onto a cotton cloth and gently press with a sponge to remove excess water.
  

• Drying: let the sheet dry flat on a cotton surface. Avoid direct heat and sudden temperature changes.

• Finishing: once completely dry, carefully peel off the sheet and flatten if needed.

Key observations
After drying, the sheets show a stable structure across different formats and wool quantities, but remain thin and relatively rigid with limited flexibility.
The addition of CMC appears to improve fiber cohesion, though it was not essential for sheet formation.
The use of unwashed wool did not affect fiber–binder interaction.
Further evaluation through hot pressing and edge refinement is planned to improve surface quality.

Wool + natural bio-resins

My initial idea was to buy an exisiting bio-resine and combined it with wool. When I started investigating the topic, I shifted to investigate the use of food waste to obtain a plastic-like or more resin-structured material.

I had banana peels and avocado seeds available at home, so I conducted two separate tests.

Experiment 1: Banana and wool

Process

MATERIAL:

• 200 g banana peels
• 3 g of washed wool
• 3g of unwashed light wool (comparative sample)
• 150ml water (adjustable)
• 2 teaspoon sugar (plasticizer, optional)
• 1 teaspoon cornstarch (thickener)
• 1 teaspoon glycerin (plasticizer)

• 3 drops lemon essential oil (optional, odor control)

• spatula

• balance
• bowls
• wood or silicone mold
• blender
• pot
• Heating plate or microwave

STEPS:

• Preparing the banana pulpp: Cut the peels into small pieces. Place the peels in a blender with 1 tablespoon water and the sugar. Blend until smooth and gelatinous.
  

• Thermal gelatinization: heat the mixture gently for 10 minutes, stirring continuously. Add water if necessary to avoid burning. Alternative: microwave in short pulses of 15–20 s.
  

• Fiber incorporation: Manually tear wool into small fragments. Incorporate wool gently into the warm matrix, preparing Sample A (washed wool) and Sample B (unwashed wool - comparative).
  

• Casting: spread the mixture evenly into a mold, thickness 2–5 mm.

• Drying: air-dry slowly in the shade for 12–48 hours depending on humidity and thickness.

Key observations
Drying

+1week
The test was not successful. The samples were left to dry at room temperature in the lab and developed mold. Additionally, the composite did not behave like a resin and bent when in contact with the wool.

Experiment 2: Avocado dyeing bath + seed, wool and alginate

Inspired by a recipe from REMIX EL BARRIO, I tried to change recipe proportions to get a more rigid material.

Process

MATERIAL:

• Avocado peel bath (400–500 mL, used for biochromes test)
• Avocado seed
• 14 g alginate
• 5 g glycerin
• 1–2 g seed oil (optional)
• 5–10 g avocado seeds (roughly crushed)
• 5–10 g (washed, carded) wool

• Calcium solution

• bowl for mixing

• spatula
• mold or flat surface for shaping
• protective surface (paper, plastic)

STEPS:

• Preparation of Seed Paste: break avocado seeds into smaller pieces using a mortar/pestle or a strong blender. Soak the pieces in a small portion of the avocado bath for 15–30 minutes to soften. Lightly blend or mash to obtain a paste: granular texture is fine, it will act as filler and provide rigidity.

• Composite Preparation: In a bowl, mix: avocado bath, alginate, glycerin, seed oil and stir gently until fully dissolved. Add the seed paste into the mixture and incorporate evenly. Tear the wool into small pieces and fold into the gel mixture.

• Shaping: pour or spoon the mixture into a mold or onto a protected flat surface. Spread into thin layers (2–5 mm) for faster and more uniform drying.

• Increase rigidity: apply a calcium solution spray to cross-link alginate.

• Drying: let the material dry slowly at room temperature, away from direct sunlight.

NOTES:
- Seed granules act as filler and mechanical reinforcement, even without being pulverized.
- Reducing glycerin and oil increases rigidity but slightly decreases elasticity.
- Cross-linking with calcium is optional but enhances the structural stability of the composite.

As mold I replicate the configuration in the tutorial using a embrodery wooden hoop and texture waterproof fabric.

Key observations
Drying

+1week
The test was not successful. The samples were left to dry at room temperature in the lab and developed mold. Additionally, the composite did not behave like a resin: the wool remained highly visible and the shape deformed, likely due to contact with the calcium carbonate solution.

Next steps

No additional experiments are planned before an upcoming workshop on Febr 26–27 with FR Woolshed and Le Textile Lab.

By Feb 10, I will prepare a template to systematically document all experiments conducted so far. This will ensure that existing samples are fully leveraged during the workshop and for future lab-level testing.

Phase 2 (February)

After the mentoring session on January 27, I defined the scope as follows:

• Deliverable: a workshop template, taking inspiration from She Makes

• Concept: a community workshop to be tested with FR Woolshed partners, as planned. The workshop will focus on the standard alginate-based recipe mixed with wool and fillers made from dried food-waste powders. No heating is required; it is sufficient to create the alginate solution and then allow participants to choose how to mix the composite (similar to Le Precious Textile workshop in Le Textile Lab).

• Powder ingredients: various ingredients can be used (for example, orange peels).

• Tools: a dehydrator can be used to obtain the powder: the finer the powder, the better the result. As a tool, a cereal grinder can be helpful.

Narrative
The wool–alginate combination has potential as a sustainable and bio-based composite: wool provides natural softness, while alginate contributes structure and biodegradability.

The workshops aim to explore how this composite behaves allowing participants to test different textures and ways of combining ingredients.

I have prepared a workshop template and a sample documentation sheet to complete, resources available here.

Alginate foil recipe

INGREDIENTS:

• 12 g Alginate
• 20 g Glycerin
• 400 ml
• 10 g seed oil

TOOLS:
* a pot * a balance * a spatula * a mixer * embrodery hoops as molds

PROCESS:

1. Preparing the calcium chloride: in a spray bottle, mix calcium chloride with water (10 g of calcium per 100 ml of water)

2. In a container, mix all the ingredients and then blend.

3. Once a creamy consistency is obtained, stop the blender.

4. Let the mixture rest for several hours to allow air bubbles to escape.

5. Pour the mixture into molds.

6. Spray the calcium chloride onto the mixture.

7. Let it dry. Speed up the process with a dehydrator.

References and Inspirations

• Google patents

• Remix el Barrio

• Kofi matters

• Video tutorial: making paper from fibers

• Making papers tutorial

• Materiom

• Futurematerialsbank

• Shemakes

• Wool-Alginate (Woolmark)

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Images: Martina Muroni unless otherwise stated.

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