Author Archive

Dwayne Heard Interview

Dwayne HeardProfessor Dwayne Heard is Head of Chemistry at the University of Leeds, and works in atmospheric chemistry, measuring the concentration of key reactive intermediates. Professor Heard is the chairman of the RSC Faraday Division Standing Committee on Conferences (which oversees Faraday Discussions), a member of Faraday Council and he serves on the board of Chemical Society Reviews.

 

You work in the field of atmospheric chemistry, looking at the OH radical, and have worked in some exciting places. Which has been your favourite?

I would say Borneo: we were taking measurements in the middle of the rainforest, with monkeys, king cobras, pygmy elephants and lots of leeches. It was certainly an adventure – I had to take three planes and a 4×4 to even get close. I enjoyed it but it was difficult and can be quite stressful. You are there to get the measurements you need, and if you don’t get them, all that time and resources are wasted.

Read the full interview  and if you have any additional questions for Dwayne, add them below.

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Chem Soc Rev appoints two Associate Editors

It gives me great pleasure to announce that Professors Philip Gale (Southampton) and Douglas Stephan (Toronto) have been appointed as the new Chem Soc Rev Associate Editors, effective from 1st January 2011.

Phil Gale Phil will be the Associate Editor, Reviews, covering supramolecular, macrocyclic and coordination chemistry.
Phil has been a very active member of the Editorial Board since 2005, including acting as a guest editor for the recent Supramolecular Chemistry of Anionic Species themed issue
Doug Stephan Doug will be the Associate Editor, Reviews, covering inorganic and organometallic chemistry, including main group and transition metal chemistry, organometallic reactivity and catalysis, ligand design, applications of catalysis in organic chemistry, materials and polymer synthesis.
Doug joined the Editorial Board at the beginning of 2010 and has proved to be an invaluable member thanks to his enthusiasm and expertise.

I am delighted to welcome them to their new roles.

If you are interested in writing a review for Chem Soc Rev, please contact the Editorial Office.

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In-situ characterisation of heterogeneous catalysts

Chem Soc Rev outside front coverHeterogeneous catalysis is a core aspect of the energy, automotive, chemical and pharmaceutical industries as most chemical reactions are catalysed by at least one material containing a multitude of often distinct catalytic functionalities. The genesis and working principles of heterogeneous catalysts still very important scientific challenges to both academic and industrial scientists.

In this themed issue, the final issue of 2010, guest editor Bert Weckhuysen (Utrecht University, the Netherlands) introduces a collection of 28 reviews covering the advantages, limitations, challenges and future possibilities of in-situ catalyst characterisation techniques.

If you have any comments on this issue or suggestions for future themed issues, or you would like to write a review for the journal, please leave your comments below or contact the Editorial Office.

PCCP is delighted to announce a high-profile themed issue, co-Guest Edited by Bert M. Weckhuysen, on Operando Surface Spectroscopy. Based on the increasing momentum and interest that operando spectroscopy is gaining, this issue focusing on phenomena occurring at the solid-gas and solid-liquid interface, will be appealing not only to specialists but also to many scientists, and engineers alike, in many areas of the physical chemistry community. Submit to this issue before 15 August 2011.

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2010 Chem Soc Rev Lecture – it was magic!

The 2010 Chemical Society Reviews Award Lecture entitled “Bioinorganic Chemistry of Mercury and Approaches to Detoxification” was presented by Professor Gerard Parkin of Columbia University at the 43rd Inorganic Discussion Weekend held Nov 6th and 7th on the campus of the University of Windsor, Windsor, Ontario, Canada.

Stephen Loeb presents Gerard Parkin with his award certificate
Stephen Loeb presents Gerard Parkin with his award certificate

The 150 graduate students and their supervisors from Ontario and Quebec in Canada and Michigan and Ohio in the USA that attended the lecture were treated to a rousing performance in which Professor Parkin recounted his latest research results on the coordination chemistry of mercury alkyls along with a fascinating historical and environmental perspective of the subject. The audience was thoroughly entertained as Parkin engaged them in vigorous discussions and amazed them with a variety of magic tricks – a real treat!

Gerard Parkin perfoms a magic trick

The Chem Soc Rev 2011 Emerging Investigator Award and 2011 Lecture Award are now open for nominations. Please contact the Editorial Office for more information.

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Chem Soc Rev Lecture Award at 43rd Inorganic Discussion Weekend

I am pleased to announce that the 2010 Chem Soc Rev Lecture Award will be presented to Professor Gerard Parkin at the 43rd Inorganic Discussion Weekend taking place at University of Windsor, Canada, on 5th-7th November 2010.

The title of Professor Parkin’s lecture will be ‘Biorganometallic Chemistry of Mercury and Approaches to Detoxification’.

Nominations are now open for the 2011 Chem Soc Rev Lecture and Emerging Investigator Awards. Please contact the Editorial Office with your suggestions by 31st January 2011.

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Supramolecular chemistry of anionic species

Anions are key to many processes, both industrial and biological, playing crucial roles in both health and the environment. Their role, function and properties are at the heart of many scientific research programmes within the field of supramolecular chemistry.

Outside front cover

In the latest Chem Soc Rev themed issue, guest editors Phil Gale and Thorri Gunnlaugsson have collected together a series of reviews covering many recent advances in this exciting area of chemistry. Topics include sensing, transmembrane lipid-bilayer transport of anionic species, urea-based receptors and conformational control using anions.

Read the full issue, which includes a preface from the guest editors, 10 tutorial reviews and 14 critical reviews. If you have any comments on this issue or suggestions for future themed issues, or you would like to write a review for the journal, please leave your comments below or contact the Editorial Office.

And if you enjoy this issue, you’ll also enjoy Phil Gale’s ChemComm Highlight in Chemistry entitled ‘Anion Receptor Chemistry’.

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Interview: Enthusiastic fantastic

Helma WennemersHelma Wennemers is professor of chemistry at the University of Basel, Switzerland. Her research focuses on the development of peptides as asymmetric catalysts, peptidic scaffolds for applications in the life and materials sciences as well as the use of peptides to control the formation of metal nanoparticles. She is a member of the Chemical Society Reviews editorial board.

 

 

 

Who or what inspired you to become a scientist?
I hadn’t always wanted to be a scientist. At school I majored in history and English and then decided to study food chemistry. Luckily, it involved a lot of chemistry and this is when I discovered how much insight into nature you can get by looking at molecules. It is the molecular view that got me fascinated about chemistry and doing organic chemistry.

Why did you decide to specialise in peptides?
Peptides serve many different and important functions in nature and everyday life that range from hormones to toxins and artificial sweeteners. This is because lots of different tripeptides can be made by combining different variations of any three of the 21 natural amino acids. This large molecular diversity makes peptide chemistry complex but also offers exciting research perspectives. For example, I was curious to find out if peptides could function as asymmetric catalysts, a role that is currently not known from natural peptides.

What is hot in peptide chemistry at the moment?
Peptides have had a revival in medicinal chemistry because companies have started to realise that for certain therapeutic targets small molecules are just not enough. Peptides and peptide mimics are generating a lot of interest as a possible way to tackle these challenges. Aside from the medicinal aspect, the large molecular diversity of peptides has led to their use in other fields, such as nanosciences, materials chemistry, and asymmetric catalysis. 15 years ago, people would have said that there was no way a small peptide could catalyse a reaction. Nowadays, we and others have shown that this is possible. Peptide chemistry has many different facets and that keeps things exciting.

What is the key to running a successful research group?
This is a difficult question – I generally just do, without thinking too much about how I actually do it. Obviously, a certain degree of (social) intelligence is useful on top of picking interesting research projects and being a good teacher. One of the most important aspects is to be able to motivate and inspire your co-workers so that they become independent, self-responsible scientists. There is nothing more rewarding than seeing a student getting excited about scientific challenges and succeeding in tackling them.

How would your students describe you?
In some theses I get thanked for my ‘contagious enthusiasm’.

As a successful female scientist, what would you say to young women thinking of embarking on a career in science?
If you want something, work hard and you will succeed. Go your own way. Role models are important but everyone has a different path. I never got anything extra because I was female but also I never missed anything. Do what you want to do. Go for it!

You joined the Chem Soc Rev editorial board last year. What do you enjoy most about the role?
Chem Soc Rev is a terrific journal and helping to keep and enhance its quality is a great honour. In addition, I get to meet people that work in different areas of chemistry and I always find crossing such borders fascinating.

Who from the past or present world of science would you invite to a fantasy dinner party?
From my peptide interests, I’d love to invite Emil Fischer or Linus Pauling, both because of interests in the sciences but also for their broader vision on society in general. Meryl Streep would be high on my list too – I love her films. I’d also choose Plato or another hero from Ancient Greece.

What do you like to do in your spare time?
In my semi-spare time, I try to enthuse the general public, particularly children, about science. 10 year old kids are very happy customers. You see their enthusiasms, their ‘wows!’ Grown up bankers and lawyers are much harder customers but there is some hope. I also try to go as much as possible to art museums and like sports, yoga and reading. My group and I love outdoor activities like hiking and canoeing.

Find out more about Helma’s work on her website.

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Searching for better batteries

Escalating global energy demand along with the limited supply of fossil fuels and mandates to minimise CO2 emissions has increased demand for alternative energy sources. Li-ion batteries have played a key role competing with Ni-MH batteries to supply power for small electronics since Sony launched the first generation Li-ion battery in the early 1990s. Recently, Li-ion batteries have predominantly provided the electrical power necessary to operate small portable electronic devices such as cellular phones, laptop computers, and camcorders. In addition, they have been used in both hybrid electric vehicles (HEVs) and back-up electricity storage units for renewable energy sources which require a large unit.

In 2008, sales of rechargeable Li-ion batteries reached 10 billion dollars and are currently growing at nearly 10 per cent per year. Furthermore sales are expected to grow dramatically if Li-ion batteries can be successfully implemented in HEVs or plug-in electric vehicles (PEVs).

A Li-ion battery is mainly composed of a carbonaceous anode (generally graphite), a carbonate-based organic electrolyte with a Li-containing salt (e.g. LiPF6), and a Li metal oxide cathode (generally LiCoO2). Li ions are inserted between graphite and LiCoO2 through the electrolyte during charge and discharge, respectively. Since the demand for safe Li-ion batteries exhibiting high power, large capacity, and high rate capability is ever increasing, research has been carried out worldwide to find new electrode materials to replace the currently used materials.

Formation of lithium-metal alloys

Alloying different metals with lithium could give rise to better Li-ion batteries

Li metal can electrochemically alloy and de-alloy with other metals at room temperature in an organic electrolyte electrochemical cell. Li-alloying reactions with metallic or semi-metallic elements and various compounds have been investigated during the past few decades. Although these alloying materials provide a larger specific capacity than graphite, except for a few transition metal oxides, they generally suffer from a large irreversible capacity at the first cycle and poor cycling behavior due to a large volume change during cycling.

If the microstructure of the electrode materials can be designed properly, the volume change during lithiation and delithiation would be compromised to some extent. In 1997, Fuji announced its Stalion battery, which employed an amorphous tin composite oxide (TCO) anode, but it was not commercialised because of its large irreversible capacity during the first cycle. Since then, Sony developed its Nexelion battery in 2005 using an anode material mainly composed of a Sn/Co/C composite with Ti metal synthesised by a high energy mechanical milling process. Not only composite materials, but also nanosized particles and nanostructured materials have also been suggested to alleviate the mechanical strain generated due to the volume change as the Li ions are inserted to and extracted from the host electrode materials.

A number of scientists have examined alloy-based anodes, in particular, focusing on the Group IV and Group V elements and their composites for Li-ion batteries. Research on Group IV elements has been performed using several material concepts based on nano-architecturing of materials, active/inactive composite, intermetallic compound, and the use of carbonaceous material as a matrix phase. Group V elements-based intermetallics can lead to interesting crystalline structures that enable new concepts for anode materials, such as topotactic reaction, quasi-intercalation reaction and other interesting insertion and conversion reactions, to be designed.

Although research on the alloy-based anode materials for Li-ion battery has a long history since 1971, a breakthrough is required to bring out their full potential for Li-ion battery. Development for alloy-based anodes will remain a highly competitive field providing us with an excellent and fascinating energy source.

Read more in the review ‘Li-alloy based anode materials for Li secondary batteries’ in Chemical Society Reviews.  And if you are interested in energy-related research, check out the Renewable Energy themed issue.

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