Magdalena Wajrak, Edith Cowan University

If you’ve been in the market for a new hair dryer, you’ve likely seen advertising for ionic ones. Some claim to produce negative ions in the millions – with or without the help of added minerals like tourmaline.

The broader claim is usually that these ions break water molecules into micro-droplets, resulting in faster drying and reducing frizz to give you super smooth, shiny-looking hair.

Are ionic hairdryers actually capable of doing what they claim? To understand this, we need to briefly delve into some fundamentals.

Wait, what is an ion?

All matter is composed of invisible building blocks called atoms. But they’re not the smallest things we know of. Atoms contain subatomic particles – protons, neutrons and electrons.

Every atom has a nucleus, a very dense centre made up of protons and neutrons. The number of protons determines what chemical element the atom is. Hydrogen has one proton, carbon has six, oxygen has eight, and so on. Molecules are groups of two or more atoms that form a chemical element; an oxygen molecule consists of two oxygen atoms, for example.

How does all this relate to ions? This is where electric charge comes in. All subatomic particles have an electric charge. Protons have a positive charge (+), electrons have a negative charge (-) and neutrons are, as the name suggests, neutral.

The nucleus has a positive charge overall, thanks to all the protons. Negatively charged electrons surround the nucleus because opposite charges attract. This is called electrostatic force, and it is this force that actually keeps the electrons from flying off away from the nucleus.

But electrostatic force is pretty weak. When materials touch or are rubbed together, we get the triboelectric effect – electrons can transfer from one surface to the other. This produces ions: positively or negatively charged atoms or molecules. For example, a negative oxygen ion is oxygen that’s gained an extra electron.

What do ions have to do with hair, then?

For the most part, hair is composed of large complex molecules called keratin proteins. In turn, keratin molecules are composed of various chemical groups, such as carboxyl groups, amino groups and disulfide groups. These can gain or lose electrons.

So, when hair is dried with hot air or is subjected to friction, keratin fibres lose electrons via the triboelectric effect – they become positively charged.

Remember electrostatic force? When hair strands are positively charged they push away from each other, and you get frizz and fly-aways.

This is why hairdryer manufacturers have come up with the idea to neutralise the positive charge with negative ions from the hairdryer. In theory, this should return the charges in your hair to neutral and therefore reduce frizz.

How do hair dryers generate negative ions?

This part is just physics. Although different manufacturers may use slightly different methods, most ionic hairdryers use high voltage applied to a fine wire inside the hairdryer.

This creates a very strong electric field near the outlet where the hot air is blowing. It sends electrons into the surrounding air, producing negatively charged ions – mostly oxygen and nitrogen. The airflow then carries these ions out with the hot air.

To increase the number of negative ions produced during this process, some ionic hairdryers incorporate a mineral called tourmaline which emits negative ions naturally.

Although theory does support the claim that negative ions might neutralise the electrostatic charge of positively charged hair, in practice the amount of ionisation generated by the ionic hairdryers is very small because they’re limited by the voltage applied (typically 1,600V).

Sure, you could generate a huge amount of negative ions with enough electricity, but that’s beyond the scope of an everyday beauty appliance.

The effect would likely be subtle

Overall, this means the effects from an ionic hair dryer would likely be subtle.

Other factors will play a more significant role in smoothness – such as your hair type, hair quality (whether it has been chemically damaged by bleaching or dyes) and what products have been used on the hair prior to drying.

There is also no scientific proof that ionic hairdryers dry hair faster by breaking up water droplets more efficiently, although some studies have demonstrated that ions enhance the evaporation rate of water.

Ultimately, before investing in a very expensive hair dryer, you may want to look at improving the health of your hair in general. Negative ions – while plausible in theory – can only take you so far.

Magdalena Wajrak, Senior Lecturer in Chemistry, Edith Cowan University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Read More........→April 15, 2026 Categories: How,Style

Rose Marroncelli, Nottingham Trent University

Denim is present in practically every country in the world and is widely adopted as one of the most common forms of everyday attire. Its appeal spans generations and social groups: jeans are worn worldwide by those who follow fashion and those who do not, by people seeking to stand out and by those who prefer to blend in. However, many of us have never found the perfect pair.

Although denim has been produced since the 16th century, its association with American culture and durable workwear emerged during the Californian gold rush of the 1850s. It was during this time that Levi’s – now arguably the most recognisable denim brand – was established.

Levi Strauss, an immigrant entrepreneur who arrived in California from Bavaria in the 1850s, opened a dry goods business catering to miners. One of his customers, the tailor Jacob Davis, developed the innovative use of metal rivets to reinforce stress points in work trousers, making them more durable. Strauss and Davis jointly patented this technique, and the Levi’s brand was born.

Blue jeans were originally a seen as symbol of labourers (like the miners) and they also gained a strong association with cowboys. In the decades that followed, denim jeans evolved from practical workwear into one of the most iconic and enduring symbols of global fashion and culture. Film stars such as Marlon Brando and James Dean popularised the jeans and t-shirt look to a young generation in the 1950s. These films personified motorcycle-loving nonconformists, and 1950s Hollywood embraced denim as the garment of rebellion.

Today, the cultural significance of denim jeans has moved beyond early associations with workwear, the cowboy and the teenage rebel, to become a staple worn by people of all ages and backgrounds.

Finding the perfect pair

Denim jeans are often seen as a problematic fashion product in terms of sustainability, because their production leaves a considerable environmental footprint.

Cheap prices on the high street can encourage consumers to treat denim products as short-term items, reducing their lifespan. Cotton, which is commonly the main fabric for denim, is incredibly water intensive; the production of one pair of jeans uses approximately 7,500 litres of water.

Different components involved in the making of a single pair of jeans, such as denim, thread, cotton and buttons, can originate from different countries all over the world. This raises questions regarding the environmental costs involved in the production process. Further issues include that jeans are often not made from single fibre materials and therefore cannot be recycled.

Adding to sustainability concerns, at the consumer level, the perfect pair of jeans remains an elusive concept. But in a recently published book chapter, I explain that the perfect pair of jeans is elusive for a reason. Jeans have to be correct for the individual wearer in terms of comfort, social and personal identity, and also the complexity of fit.

Previous reports have focused on women’s struggle to find jeans that fit and are flattering. The inability to find the perfect pair of jeans may encourage overconsumption, due to repeated purchasing based on poor fit.

My research shows that this is an issue which applies to all genders. The men I spoke to noted how they resented paying a higher price for brands like Levi’s, so spent less by purchasing cheap, high street alternatives. This attitude can lead to overconsumption, as low price points achieved through low-quality production often compromise product longevity.

This demonstrates the perpetuating cycle of fast fashion, driven by cheap, low-quality production, and contradicts the original purpose of jeans of being highly durable and having longevity. The combination of highly environmentally damaging production processes with overconsumption results in even greater environmental harm.

Retailers can make efforts to reduce the trend of overconsumption with better fitting garments. However, fit is a complex issue for retailers as well as consumers. For the retailer, producing jeans in a wide range of sizes and styles is often not cost effective, and complex sizing systems can also confuse the consumer.

Technology could provide future solutions to improving the accuracy of fit. Personalised virtual fitting, made possible through improvements in 3D human shape recognition, could ensure improved fit for the consumer. This would benefit online shoppers, although the technology does remain in its infancy, and is yet to be adopted by major online fashion retailers. Virtual fitting rooms also cannot replicate the feeling of denim next to the skin, so although the fit may be perfect, comfort could be compromised.

Ultimately, the enduring challenge of finding the “perfect pair” of jeans highlights not only the garment’s cultural significance but also the opportunity for the fashion industry – and consumers – to move toward more sustainable, better-fitting and more thoughtfully designed denim for the future.

Rose Marroncelli, Lecturer, Nottingham Trent University