"I am a happy customer of SEADM products. In our laboratory at the University of Helsinki we use daily the electrometers, and Half-mini and P5 DMAs manufactured by SEADM. We use the Half-mini DMA together in research topics where ion classification with high resolution in the size range of 1-10 nm is essential, such as nanoparticle synthesis and particle counter characterizations, and more recently in atmospheric measurements too, thanks to recent improvements in the DMA.
Our DMA P5 is the front end of a commercial mass spectrometer. SEADM tailored the interface between the DMA and mass spec specifically for us, which to my great pleasure was implemented without any problems. We use the DMA P5 in electrospray and cluster dynamics research.
"The Half Mini DMA is a robust and user friendly instrument that has also a good configuration flexibility allowing to personalize the measurements strategy. The possibility of classifying even small ions offered by the instrument is greatly beneficial to unveil the mechanisms of particle nucleation even in challenging environments such as sooting flames."
"In the first tests with the new and improved SESI measuring device, we were able to measure certain metabolic molecules in exhaled breath which scientists had not been able to detect in breath before."
"I have followed the development of Yale's high resolution DMAs since year 2004, when I participated in the development of the large so called Attoui DMA designed for a wide size range. I have used extensively a number of versions of both the relatively large Herrmann DMA and the far more manageable Half Mini DMA. My laboratory owns prototypes of these three models, which we use all the time.
I have collaborated with many colleagues in Europe, Asia and the US in projects relating to these DMAs, often used to study clusters, or to generate size standards in order to characterize other instruments.
The Half Mini DMA is a splendid device for the laboratory as classifier and sizer and for atmospheric monitoring of sub 10 nm particles and atmospheric ions.
It is difficult to imagine developing any aerosol instrument operating in the 1-10 nm range without the help of such a DMA. This is particularly true in the case of nano-CPCs, on which I have worked extensively. My various studies characterizing the transfer function and transmission measurements of more conventional DMAs would also have not been possible without these high resolution DMAs."
"We used a DMA P5 to size select atomic ions for further investigation of the nucleation / condensation process in an expansion type condensation particle counter. This project required the high resolution and high transmission of this instrument to get sufficient and monodisperse ions into the expansion chamber for recording the growth of the activated ions using light scattering measurements.
All ions measured had sizes in the sub nanometer range and thus other commercially available ion mobility spectrometers that operate at atmospheric pressure would not have met our needs in terms of resolution or transmission. This enabled experiments at a new level of accuracy and precision. SEADM was very helpful with making this project possible."
"As the oldest, most well-understood, and robust continuous ion mobility filter for low-field experiments, DMA instruments for coupling with mass spectrometers have many advantages and have been commercialized by SEADM (Boecillo, Spain). Although most DMA instruments have been coupled to quadrupole and quadrupole-TOF mass spectro-meters, they have also been extended to FTICR mass spectrometers and we expect other variations to surface in the near future as their low-field and structural selectivity makes for a good fit with more detailed post-mobility-selection analyses and their recent availability by SEADM makes for ease of coupling to mass spectrometry."
"I own a hybrid DMA-MS that was tailored to allow multiple sampling options including liquids, vapors and aerosols. The system was constructed on a single frame that allows me full freedom around the lab and chances for field campaigns. The whole system is as robust as it can be, providing real-time outstanding 3D plots (m/z-mobility-intensity) in a regular manner that has open new frontiers to food or environmental analysis. SEADM did construct the system around my available mass spectrometer without any constraint. Their team of engineers are really problem-solving focused and are easily accessible at a phone call."