Searching For Yet Another Home

It’s that time of year again — looking for somewhere to live, traipsing around south west London stopping in every letting agent to give my well-rehearsed spiel of requirements.[^req] I’ve been dreading the search for quite some time. Reading Money Saving Expert’s advice to tenants is most definitely bad for my health; I leave my computer a wreck, paranoid that every landlord and letting agent is out to rip me off.

This will be fifth “home” in as many years. My halls were in Hammersmith, which was quite good as there were lots of bars and pubs and good night bus routes. Most of Imperial’s halls were in South Kensington, which I think is rubbish as you there’s nothing you can afford or would want to do — Boujis is not my idea of a good night out. Halls went downhill in the summer term when a noisy exchange student and about ten of his friends moved in next door and cockroaches infested our flat. It didn’t help that he never used a plate when eating.

In my second year I lived with a couple of friends in a nice three bed terraced house with a garden in Putney. Well, not Putney, more like Roehampton, and the commute was the entire 430 bus route. My room was tiny but I liked living there until new neighbours moved in and installed an incinerator in their garden. This filled our house with smoke every day.

Third year was the worst. My friends and I agreed to find a house with an additional friend and his girlfriend. We struggled to find a five bed house so settled on a four bed in North Kensington[^NK] with the lounge as the fifth bedroom. I wasn’t happy about it and in hindsight it was a very bad decision. The house was filthy and full of miscellaneous rubbish from previous tenants, but seemed nice at the time because all the other places we viewed were so awful. The couple’s relationship was rocky to say the least and they were, to put it bluntly, idiots. They were awful to live with—never paying rent and bills on time, never cleaning up after themselves—and a big argument with them resulted in the house becoming a terrible place to live. I believe they moved into a flat together the following year then split up midway through the tenancy. I’m not surprised.

I found someone to take my room for the last month of the tenancy and moved into a one bed flat in West Kensington/Brompton with my girlfriend for my final year. It was a great decision to move in together. It was a 30 minute walk to Imperial, spacious and nice inside, but like all the other places it had its problems. It was on a very noisy road where drunks and wannabe gangsters loitered. Attached to the outside of our bedroom wall was a air conditioning unit for the shop downstairs that ran all night long. You couldn’t open any windows because of the noise. The neighbours also played bangra late into the night, every night. When the music stopped, we could hear mice squeaking and scurrying around in the bedroom walls and under the kitchen cupboards. We moved out at the end of the year and have spent the summer at our parents’ houses, which has been good but difficult at times.

So now we’re looking for another flat in Wandsworth. Since it isn’t in central London it’s a lot cheaper and for the first time ever letting agents are telling us that we have a good budget and should be able to find somewhere nice! We were even asked what kind of flat we wanted — Victorian conversion, purpose-built… As long as it’s bricks and mortar I don’t really care! Unfortunately the market moves very quickly and properties are on the market, viewed and let in the same day, so I’m phoning agents everyday to try and make viewings. I hope that we won’t have to move again for at least a couple of years.

My PhD stipend will mean that, for the first time in the last four years, I’ll be in a relatively good financial position. I’ve always worked part time to support myself and at times money worries caused me a lot of stress. Rent is still eye-wateringly expensive and I wonder how anyone on an average income can afford to live in London, especially with rising living costs.

In the past year there has been a lot of controversy over the government’s decision to increase the cap on tuition fees to £9000 a year. If I was going to university this September I would be a lot more worried about living costs rather than the £9000 tuition fees. Finding reasonably priced accommodation in London is really difficult — my maintenance loan only just covered my rent. It deeply concerns me that Imperial keeps building luxury halls that cost around £220 per week! This is blatantly to encourage wealthy international students, who pay higher fees than home students, to come to Imperial. Thankfully, the new union president, Scott Heath, has made it one of his priorities to keep accommodation costs down but I’m sceptical as to how much any sabbatical can achieve in a year. He was interviewed in a recent Guardian article about student debt and my position and experiences were very similar. I hope something will be done to help students like myself who aren’t from poor enough families to receive significant bursaries but not wealthy enough to be supported by their parents.

Update (25th August 2011): We got a flat! We had to make a few compromises, but it’s really nicely decorated. Pleased and relieved it has been sorted relatively quickly.

*[PCM]: per calendar month

[^req]: “We’re looking for a one bed flat—no studios—for £1000 PCM, furnished, a bit of space, just nice, not grotty. No mice. … Yes, that is our maximum budget.”

[^NK]: North Kensington is nothing like South Kensington — more the complete opposite. West Kensington is alright. East Kensington doesn’t exist.

MSci Project Part 1: Quantum Dots

I don’t start my PhD until October so I won’t be posting much about it for a couple of months. In the mean time, I thought it would be nice to talk about what I did for my final year research project as part of my MSci degree.

The aim was to synthesis quantum dots[^1] using microfluidic reactors. It sounds complicated, but really it’s quite straight forward! An explanation of it all in one post would be rather long so I’m going to break it down into two posts, starting with quantum dots and then moving on to microfluidic reactors.

What are Quantum Dots?

Quantum dots are nanoparticles—particles only a few billionths of a metre in size—made from semiconductors. Semiconductors are materials whose electrical conductivity is midway between that of insulators and conductors. They are the foundation of modern electronics and without them we wouldn’t have components like transistors and diodes which are essential building blocks of the technology we use every day.

All materials have particular physical properties—such as the melting point or density—that are independent of how much of the material you have. For example, if you measured the melting point of a material, cut it in half, then remeasured the melting point, the melting point would not change. Properties like these are called intensive properties.

Imagine you had a piece of semiconductor and repeatedly measured an intensive property, such as melting point, then cut it in half. You would expect intensive properties to stay the same, regardless of the amount of material. However, if you carried on doing this for quite some time—so that your semiconductor was just a few billionths of a metre across—you would find that its properties would start to change: properties which were intensive become extensive and dependent on how much of the material you have. Chemists take can advantage of this phenomenon to tune the properties of semiconductors for particular applications by controlling the particle size.[^2]

Making Quantum Dots

Rather than breaking down macro- or microscopic bits of semiconductor to make nanoparticles (“top-down”), chemists usually make quantum dots from individual atoms (“bottom-up”). This is most commonly achieved by injecting the appropriate reagents into a hot solvent. The quantum dots spontaneously form in the hot solvent and are left to grow to the desired size.

The photo below is of some cadmium selenide quantum dots that I made last year. I think it’s a wonderful example of their size-dependent properties.

CdSe Quantum Dots
CdSe quantum dots fluorescing under UV light.

Each vial contains quantum dots that were removed from the reaction vessel at regular intervals. The vial on the far left hand side contains quantum dots grown for 30 seconds and the vial on the far right hand side contains quantum dots grown for 3 hours. The mean size of the particles grown for 30 seconds and 3 hours was 2.8 nm and 4.2 nm respectively, so the nanoparticle size increases from left to right.[^3]

The colour arises from a process called fluorescence. The vials are sat on top of an ultraviolet lamp which causes the quantum dots to fluoresce and emit light, the wavelength of which is dependent on the size of the quantum dots.

These unique optical properties make quantum dots very attractive for use in solar cells, displays and even in medical imaging. The trouble is that high-quality quantum dots are quite tricky to make, especially on an industrial scale. In part 2, I’ll talk a bit more about the applications of quantum dots, what microfluidics is and why it’s great for making quantum dots. If anyone has any questions, please don’t hesitate to ask!

[^1]: For the chemists/physicists: I was working on core-shell and ternary quantum dots rather than regular binary quantum dots.

[^2]: This behaviour isn’t unique to semiconductors—it’s just that the change occurs at a much larger particle size for semiconductors than for metals because of differences in the arrangement of electron energy levels in metals and semiconductors. See this very frequently cited paper in Science if you want the details.

[^3]: Analysis was performed using a technique called transmission electron microscopy, if you were wondering. It’s very cool.