Does Cornstarch & Lotion Make Slime?

Ever heard about the joy of slime, that satisfying, squishy, and often colorful substance that's been a hit among kids and adults alike? With the rise of DIY slime-making, you might have come across claims that cornstarch and lotion can create slime. But does this actually work? Let's dive into the world of slime, explore the science behind DIY slime recipes, and see if cornstarch and lotion can truly create slime.

But first, let's quickly define slime. Slime is a semi-solid, non-Newtonian fluid that can flow and retain its shape. It's different from other gels or pastes in that it's more flowy and can often change its state depending on the forces applied. Now, let's take a look at the science behind slime and the ingredients that typically create it.

Understanding the Science Behind Slime

Slime is a fascinating material that relies on polymers and cross-linking for its unique properties. Polymers are large molecules made up of many smaller units. In the case of slime, these are typically formed by polymerization, a process where many small molecules are linked together in a chain.

What makes slime special is the process of cross-linking. This is when linker molecules bind multiple polymer chains together, creating a network. This network gives slime its stretchy, bouncy, and often solid yet squishy properties. Most DIY slime recipes combine a polymer-willing-to-polymerize ingredient with a cross-linker. But does this process hold true for cornstarch and lotion combinations?

What is Cornstarch?

Cornstarch, or maize starch, is a carbohydrate that's extracted from the endosperm of a corn kernel. Chemically, it's a polysaccharide, which is a type of polymer. It's often used as a thickener in foods because it contains long, linear chains of glucose molecules. But can it form slime when combined with other ingredients?

While cornstarch is a polymer, it's not one that readily forms slime on its own. It doesn't contain the functional groups that are necessary for cross-linking. Moreover, it's a zwitterionic polymer, meaning it carries both a positive and negative change, which throws off the process of initiated chemical valley polymerization, needed for slime formation.

The Role of Lotion in Slime

Lotion, a mixture of oil and water to form an emulsion, might seem like an odd ingredient in slime. While it does contain polymers like cetyl alcohol or stearyl alcohol that can act as thickeners, these are not the same polymers used in primary slime recipes. These surfactants lower surface tension, which doesn't help in slime formation but rather makes the liquid more slippery.

The typical polymer used in slime recipes is polyvinyl alcohol (PVA), which is mixed with a cross-linker like borax. PVA is a water-soluble polymer that's readily available and safe to use. In contrast, lotion doesn't contain a suitable polymer for slime formation, and its main ingredients are not compatible with the chemistry needed to create slime.

Can Cornstarch and Lotion Make Slime?

Now that we understand the science behind slime and the properties of cornstarch and lotion, let's address the million-dollar question: Can these two ingredients make slime?

In short, no, cornstarch and lotion cannot make slime. A few blog posts and social media trends might suggest otherwise, but these are often misinterpretations or misinformation. Cornstarch is not the right polymer for slime formation, and lotion doesn't contain a suitable polymer or cross-linker to create slime. Moreover, the chemistry of cornstarch and lotion makes them incompatible with the process of slime formation.

What happens when you mix cornstarch and lotion?

When you mix cornstarch and lotion, you might notice it becomes thicker and a bit more gelatinous. This isn't slime, though. It's a physical mixture that doesn't have the unique properties of real slime. It won't stretch the same way, and it won't snap back to its original form after being stretched and released. Plus, it's likely to be dry out and crumble rather than retain its form.

This mixture will also separate over time, with the water and oil in the lotion naturally repelling each other. The starch will settle at the bottom, and the lotion will rise to the top. This separation shows that cornstarch and lotion aren't compatible for creating slime, as real slime is a stable substance that retains its form.

What about activators or other ingredients?

Some online tutorials might suggest adding activators to the cornstarch and lotion mixture to try and create slime. However, activators like baking soda, cream of tartar, or even borax don't work with this combination. These activators work by cross-linking the specific polymers used in traditional slime recipes, but they don't have the same effect on cornstarch or lotion.

For instance, baking soda can't activate the cornstarch because cornstarch doesn't have the functional groups needed for cross-linking. Meanwhile, borax can't effectively react with the polymers in lotion because they're not the same type of polymers used in slime. In both cases, you're not going to get slime, and you might end up with something that's dangerous to play with or even harmful.

So, what makes a good slime?

Now that we've established that cornstarch and lotion can't make slime, you might be wondering what does. As mentioned earlier, the key to making slime is combining a suitable polymer with a cross-linker. A common DIY slime recipe uses PVA and borax. This combination works because PVA has hydroxyl groups that can react with the borax, forming ester cross-links, which give slime its unique properties.

Other effective slime combinations include silicone-based slime, like silicon dioxide slime made with cross-linking agents like dish soap or activator. These slimes are not made with water-based polymers but rather with silicone oil, which can be manipulated to make slime. There are also thermochromic slimes, which change color when heated, and all of these can be made with the right polymers and cross-linkers.

The Importance of Safety When Making Slime

While we've established that cornstarch and lotion can't make slime, it's important to note that this combination can be dangerous. Lotion often contains harsh chemicals, like isopropyl myristate or butylated hydroxytoluene, that can be irritating to the skin, particularly when used in large amounts. Meanwhile, cornstarch can be drying and may exacerbate skin irritation.

As with any slime recipe, safety should always be a priority. If you're making slime, ensure you're working in a well-ventilated area, and always wash your hands after handling the ingredients. Be particularly careful with activators like borax, as they can cause skin and eye irritation. If you're making slime with children, make sure to supervise them closely and encourage them to wash their hands frequently.

In conclusion, although cornstarch and lotion may seem like they could make slime, the chemistry doesn't support this. They aren't the right polymers or cross-linkers for creating slime, and combining them doesn't result in a substance with slime's unique properties. Always remember, safety should be your top priority when making slime, and it's crucial to use the right ingredients to create slime safely and effectively. Happy slime-making!"