37 Better Crystals for Diffraction Studies
Specially engineered Asynt DrySyn™ heating blocks are being used by Glasgow University Chemistry Department’s Research Group in Structural Chemistry to prepare high quality crystals for study by X-ray and neutron diffraction techniques. This group, part of the WestCHEM Research School led by Prof Chick Wilson, carries out structural chemistry research into the structure and properties of a wide range of molecular materials, with particular focus on hydrogen bonding. Good quality crystals of the type required for many of the studies carried out in the Wilson Group have to be grown slowly under carefully controlled conditions, requiring close temperature control over periods sometimes extending to several weeks. This can be difficult using conventional water baths, not least because of evaporation. Because of the time factor, it is also more efficient to grow many crystals simultaneously, in parallel.
Asynt’s DrySyn heating blocks have been popular in chemistry laboratories worldwide as a safer, more convenient alternative to oil and water baths ever since their introduction in 2004. In the Glasgow laboratory several units, some custom-made for the research group’s applications to hold up to 24 vessels each, are used in parallel at different temperatures. DrySyn systems are available for single or multiple reaction vessels with volumes from 1ml to 5000ml. They all combine a small footprint with excellent reaction visibility. All models are fully compatible with magnetic stirring, or the novel Vortex Overhead Stirrer System can provide powerful directly driven stirring for up to three flasks, improving performance with viscous mixtures and largely eliminating the grinding effects that can occur with magnetic stirrers on solids, especially crystals.
Circle no. 122 New Solutions in Sizing
Laser Particle Sizer ANALYSETTE 22 MicroTec plus from Fritsch, the super compact all round laser with unlimited possibilities and outstanding features including: compact size and compact price; extra wide measuring range of 0.08 – 2000 µm; and revolutionary dual-laser-technology. Practical module-system with fast-switch-system - the measuring cells of the new ANALYSETTE 22 MicroTec plus are located in convenient cartridges, which during the switch from wet to dry measurements are simply exchanged. Completely without tools! And when you are not momentarily using the cartridge, it’s simply stored in the corresponding dispersion unit. Variable measuring range - with the ANALYSETTE 22 MicroTec plus you may choose between two individual measuring ranges or combine both to a third. Your advantage: maximum flexibility, an overall measuring range from
0.08 µm – 2000 µm with an outstanding resolution of up to 108 measuring channels. Remarkably powerful - the wet dispersion unit is equipped with a very powerful centrifugal pump for the optimal transport of even heavy particles with a high concentration through the measurement system. With the help of an intelligent liquid-level-sensor, three individual amounts of liquids can be set by default and also the use of common organic solvents as suspension liquids is possible. All this, combined with an effective and variable ultrasonic-system, linked with an especially flexible software, which also manages even complex measurement sequences fully automatic and reproducible, result in a powerful system for challenging dispersion and measurement requirements as well.
Circle no. 123 ADVERTORIAL Büchi Digestion and Distillation Solutions
When it comes to nitrogen and protein determination Büchi offers state-of-the-art solutions including digestion and distillation units, autosampler, scrubber, as well as application notes. Being a leading manufacturer of such equipment for 70 years proves the company’s ability to fulfil customer requirements at any time.
Of course, requirements change over time. Robustness and ease of use have always been very important in the past and will be important features in the future as well. Modern instruments come more and more with operating software, that needs to be self-explanatory and facilitate routine work in labs, that test large numbers of samples. Generally speaking, customers expect to increase their sample throughput and lower their cost of operation.
Customer support and making application know-how available to users is an other focus in Büchi’s market activities. To achieve these goals, it is necessary to have experts in the field. In the most important economic regions Büchi established affiliate companies and in other regions or countries distribution partners make sure that expertise is available.
It becomes more and more important to qualify lab equipment used to generate crucial results. The qualification procedure includes Installation Qualification (IQ), to verify that the instrument is correctly installed, and Operation Qualification (OQ), to demonstrate that the instrument works within specifications. Büchi offers complete IQ/OQ packages consisting of all necessary documentation, certified reference substances and accessories needed.
Circle no. 124
Perfect Solutions
Increasing your sample throughput with Kjeldahl equipment for fully automated nitrogen determination
Programmable digestion units for reduced user attendance
Powerful scrubber neutralizes fumes to make labs even more environmentally friendly
Distillation unit and auto sampler with small footprint which fi ts on every lab bench and saves space Additional information is available on
www.buchi.com>Kjeldahl Solutions
BÜCHI Labortechnik AG 9230 Flawil / Switzerland T +41 71 394 63 63
www.buchi.com
Nitrogen and Protein Determination, Steam Distillation
Quality in your hands Circle no. 125
INTERNATIONAL LABMATE - FEBRUARY/MARCH 2010 - LABORATORY PRODUCTS
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