Self Healing Plastic

Leave a reply Jonny Hankins

One of the problems with plastic is that it is very difficult to repair once damaged. When there is a hole in your plastic bucket you cannot generally mend it. But researchers in Spain have developed the world’s first self healing plastic.

Cutting the self healing plastic

Cutting the self healing plastic

Researchers at the CIDETEC Centre for Electrochemical Technologies in San Sebastian, Spain have developed a plastic that once broken can heal itself. All the user has to do is put the pieces together and leave it at room temperature for a couple of hours, and the material kind of re-molds itself. The repair is said to be 97% perfect within a couple of hours, and perfect 2 days later, and a Youtube video demonstrating the strength of the repair is really quite incredible.

Plastics are made up of polymers, a long chain of molecules that are connected through chemical bonds. Natural polymers are everywhere. In nature, many polymers heal themselves when broken or sliced. Think of your skin when you have a small cut — as the two sides of the cut bind back together, you’re witnessing a self-healing polymer in action.

Synthetic polymers are just as common. Scientists started creating nylon and synthetic rubber to make up for the shortage of silk and rubber during World War II. PVC, polyester and many forms of plastic soon followed.

Putting the pieces together

Putting the pieces together

The Spanish have developed the first human-made self-healing polymer to function without a catalyst, they report in the Sept. 13 issue of the journal Materials Horizon. There are in fact other self healing plastics, but they require a catalyst to start the process (ultra violet light for example). Readers might know about self scratch repair paint, as advertised on TV. This paint is made from prawn shells, a fine example of a natural self healing material that uses the sun as catalyst.

The article states that “The idea behind this is to reconnect the chemical crosslinks which are broken when a material fractures, restoring the integrity of the material. This is expected to provide polymers with enhanced lifetime and resistance to fatigue”.

Testing the repair

Testing the repair

The researchers say this breakthrough will allow them to create stronger sealants, paints, adhesives and more. This could eventually lead to self-repairing pipes, bicycle tires and toys, among a million other possibilities.

Sounds great to me, and the less plastic we throw away the better.

How Much Freedom Does the Internet Bring You?

3 Replies Jonny Hankins

On the surface Internet living seems to bring a great deal of freedom to many different parties. Last month for example I posted from the USA, Italy and the UK, we can work from home, buy direct and have access to all kinds of information.

This might make us feel that the web itself creates freedom, or that it is free to operate as we wish. I am not so sure that this is the whole story however, and others agree.

How much freedom of speech really exists?

How much freedom of speech really exists?

Last week Security technologist Bruce Schneier gave a talk as part of the TEDx Cambridge series. Schneider is very interested in security and perceptions of security as this previous TED video shows, but last week’s talk was different.

He took the problem of Internet freedom as his topic, and raised some very interesting arguments. The following quotes are taken from his speech as reported on our local Boston.com website:

“Which type of power dominates the coming decades? Right now it looks like traditional power. It’s much easier for the NSA to spy on everyone than it is for anyone to maintain privacy. China has an easier time blocking content than its citizens have getting around those blocks.”

We can see that there is some evidence to support this case, if we look at this article that appeared in the Huffington Post a couple of years ago. It recounts the tale of Google pulling out of China because they no longer wanted to censor their searches. Google chose to redirect users to their non censored search engine based in Hong Kong. The Chinese government managed to block the results anyway, so users were left in the same position as before, no access to the information.

If we take a broader look though we find that it is not just China but other countries that are making repeated requests for Google to censor their content. CNN report the revelations of the recent Google Transparency report, where Canada, France, the UK and the USA feature strongly in the league of requested censorship. The report is here, easy to follow and a 5 minute thumb through might change your ideas regarding freedom and regulation on the web.

Just yesterday Linkedin announced that they challenging the US government over data requests. US organizations are allowed to publish the total number of data requests, but cannot break the figure down to reveal the number made by security services. Linkedin say this legal situation makes no sense, and many other companies agree. Read about it here.

“Cyber criminals can rob more people more quickly than real-world criminals, digital pirates can make more copies of more movies more quickly than their analog ancestors. And we’ll see it in the future. 3D printers mean control debates are soon going to involve guns and not movies.”

Just this week The Independent ran a story about Europe’s criminal intelligence agency that is fighting unprecedented levels of crime across several fronts as gangs capitalise on new technology. We are not talking about a few individuals hacking into the odd bank account here and there, we are looking at the new form of organized crime. A multi billion dollar industry in Europe alone.

The gun reference is of course to the distribution of plans for a 3D printer manufactured gun. Read about it here.

Caution in cases of political dissent

Caution in cases of political dissent

Much has been written about how Facebook and other interfaces have the power to democratize society, and their potential to promote revolution. The so-called Arab Spring is often given as an example, but as well as dissidents using Facebook to organize protests, the Syrian and other governments also used Facebook to identify and arrest dissidents.

There are plenty of examples. Here is an article about 3 Moroccan activists who were arrested for their comments criticizing governments at that time. One used a Wikileaks type platform, another Facebook and the third Youtube. They were all arrested and charged with various and sometimes unrelated crimes.

I wonder where they are now?

Using the Galaxy S4 Mini

5 Replies Christopher Roberts

This is the third article in a series reviewing the Samsung Galaxy S4 Mini.

Last week I finished by saying:

“In the next post in the series I will be reviewing Tech21′s Impact Shield case for the S4 Mini. See you then. :-)”

I lied.

I haven’t had a chance to use the case as much as I would like, so have delayed the article a week, so I can write a better review.

In this post I am instead going to talk about my experience of using my S4 Mini on a day to day basis.

Organisation

One of the main features I have benefited from thanks to my ‘smarter’ phone is that it has improved my level of organisation. I was already a reasonably organised person before I got my phone, however having a calendar which comes pretty much everywhere with me and can create alarms and reminders, is pretty useful!

Because I always have my calendar with me, I am able to make decisions and plans more instantaneously, which can be advantageous. That said I am now heavily dependant on my phone and were I to be without it, I would struggle to keep track of my diary. Hopefully I would be able to retrieve my schedule from Samsung, as I do try and keep my contacts and calendar backed up with Samsung sync.

Battery

In June last year, (so 15 months ago now) Joe questioned (here on Technology Bloggers) if smartphone battery improvements were on the way. I can tell you now that they weren’t! Major improvements are yet to materialise. :-/

A BlackBerry Curve 8900 in its case

My BlackBerry Curve 8900.

I used to have a Blackberry Curve 8900 which would last around two to three weeks between charges. Despite using as many power saving features as I can, I am charging my phone pretty much every day. If I had mobile data, WiFi, GPS, Bluetooth and Near Field Communications on all the time, with full screen brightness, and was using my phone a lot, I reckon I could drain it (from full) in just a few hours. The camera is a big drain on the power, as are all other processor intensive activities. That said, considering its size, the camera is amazingly good.

With regard to charging I try and turn my phone off if I am doing a full charge, but usually just trickle charge. I have researched how to maintain the battery life and have found that modern smartphone batteries are designed to be charged little and often, and they don’t like being pushed to extremes (empty/full and also high/low temperature). Keeping your battery between 30% and 90% is the best area. My battery seems pretty healthy, so the trickle charge appears to be working. 🙂

Overheating

One thing I’m not impressed with is how my phone sometimes overheats, so much so, I have to remove it from its case and can’t hold it as the back gets really hot. Considering the storage space and processing power my 124.6 mm tall phone houses, I am frankly amazed that it doesn’t come with a huge fan attached to the back. My 67.98 cm³ (which sounds like a lot, but really isn’t!) phone houses two cameras, one of which is a brilliant 8MP, a HD screen, 1.5GB of RAM, and, among other things, a 1.7GHz processor!

It is no wonder when I put my phone under stress by using a lot of features at once (like for example SatNav functions, as these are quite processor intensive and uses mobile data, GPS and the screen) it starts to overheat. For the size it is, I can’t complain, however I think future phones should be slightly bigger to incorporate better cooling systems, in order to prevent internal component damage from overheating.

Apps

One of the main reasons I chose an Android phone is because of the huge range of applications available. Most of the apps for Android are free, which is a bonus! Some do take liberties however, and demand unreasonable privileges; like the Facebook one, hence I haven’t installed it, but Facebook were going to want to glean all they could from you, weren’t they.

I now have an app to wake me up at the best time in my sleep cycle, an app which can send an SOS message via the backlight, an app to scan barcodes, an app with the latest news, oh, and amongst others, Angry Birds (although I am trying not to use it as it is a real time zapper)!

I have often been known to say ‘there’s an app for that’ but that’s because it is true; almost anything you want to do, there is an app to help you!

Android

On the first article in this series, David from The Only Cog asked about what he called the ‘Disney layer’ that Samsung add to Android – i.e. their slight OS tweaks. He asked the following questions:

“Can it be turned off? How do you find it? What version of Android is it running?”

Google Android's LogoHere are my answers. I have looked into it, and as far as I can tell, Samsung’s altered version of Android is fixed, and you can’t downgrade to the standard OS. That said, I think the changes they make are just to make things look better and also to add a further level of control for users.

The second question therefore doesn’t apply. In response to the third, I am currently running Android 4.2.2 (which came pre-installed) although I think the S4 Mini will be among the first to get 4.3, (Android KitKat) probably just after its big brother the S4 receives the upgrade.

Slogan

Samsung’s slogan for the S4 Mini is “Minimalism Maximised”. I completely agree with what they are saying, the phone has the convenience of a small phone, but the power of a bigger one. I prefer “tiny but powerful”, maybe the S5 Mini will adopt that one. If so I want royalties Samsung! 😉

Next Week

As promised, next weeks article will be a review of Tech21’s D3O infused case. See you then.