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RQCM Testimonials
Dr. Gobet Advincula, Dept. of Chemistry, University of Houston
"We have used the RQCM for most of our routine in-situ adsorption experiments of polymers and biopolymers including DNA. The data we get is reliable and correlates very well with what we can get from optical methods such as ellipsometry and surface plasmon spectroscopy."
"Some of the possible uses of the RQCM from Maxtek is in determining surface concentration and Langmuir adsorption isotherms of surfactancts and polymers. The price and reliability is very competitive compared to what you can get from similar acoustic, spectroscopoc, and optical surface analytical techniques."
"The RQCM comes from a family of great instruments developed through the years and is simple to use and reliable. It will be an essential tool for investigating adsorption phenomena, biomedical research such enzyme activity and bilipid layer formation, and the formation of nanostructured organic materials."
Russell Cooper, Dept. of Chemistry, Montana State University Department of Chemistry & Bio-Chemistry
Particle Technology
"The RQCM in our lab is being used in a vacuum to monitor the erosion of polymers upon exposure to a pulsed hyperthermal beam of atomic oxygen. For these measurements the RQCM gives more than small enough mass changes, in fact with some of the easily eroded materials the QCM can show “steps” corresponding to the erosion created by an individual pulse of gas.
"The ability of the QCM to alter the number of data points taken in a given time is also very useful due to the ability to look at what happens in a short amount of time, without compromising its ability to keep the number of data points at a manageable level during longer experiments."
"Since we do many other experiments after each use of the RQCM it is put away until it is needed again, the ease of set-up for the controller, the head, and the computer is absolutely a necessity for us. The controller is also very user friendly and it takes little time to understand how to use it to set the capacitance and take data."
Michael Auer, Friedrich-Alexander University, Chemical and Bioengineering in Erlangen
Particle Technology
"The RQCM instrument offers to me the possibility to investigate interaction forces on a small scale with the help of a comfortable complete measurement system. I am looking forward to many more of the helpful discussions in order to solve the variety of issues posed in research."
Dr. Robert Towery, Dept. of Chemistry, Houston Baptist University
"My research group has been using INFICON Maxtek equipment for over six years. Our first system used 5MHz crystals with a PM-710 frequency counter, a PLO-10 oscillator, and DOS-based data-logging software."
"Now we have upgraded to the RQCM using three 9MHz crystals, which is a great improvement in both instrumentation and software.
"I only wish I had purchased the new system sooner. The RQCM is easy to set up, almost plug-n-play, and the software is extremely intuitive which means a lot."
"My dean and chair were also happy with the price of the system as well. However, the greatest asset of an INFICON Maxtek system is the support. When things go crazy in the lab as they always do, the support people have always been there to help."
Alex Ramirez has been my contact in technical support and she has been a savior on more than one occasion. I have been overwhelmed by the friendly, patient manner in which all the company's personnel have treated me."
"In conclusion, it should be obvious that I recommend the INFICON Maxtek RQCM without reservation."
Christina Freyman, Northwestern University, Robert R. McCormick School of Applied Science & Engineering
"The RQCM has been instrumental in our research. Its small mass sensitivity has enabled us to measure small amounts (and differences) in water adsorption on films. The quartz crystals are easy to deposit on, so one can measure the water adsorption on lots of difference types of films."
"The RQCM is reasonably priced for basic research studies. It has been a good investment as it worked right out of the box and well since then. There was little set-up time, and we were collecting data sooner than expected with a new piece of equipment."
Dr. Xiangqun Zeng, Center for Biomedical Research, Oakland University
"The RQCM System more than met my needs as a research tool. I especially like the software and the analog input board is also good for EQCM. I would, in fact, recommend this unit as did the electrician who is an expert of QCM circuits."
Kenyon Evans, University of North Carolina C.H., Dept. of Chemistry, The Schoenfisch Group
"The RQCM system is an accurate multi-measurement instrument and has met our requirements. We modified the crystal surfaces with alkanethiol self-assembled monolayers & correlating the change infrequency with the amount of protein adsorbed, while correlating the resistance with the viscoelasticity of the absorbed protein layer. Once a monolayer of protein adsorbs, we look at the subsequent biological functionality of the adsorbed layer, as a function of the surface properties."
"Each flow assay ran between 12-15 hours; now we obtain statistically significant results (n=3) in 1 day instead of 3, We are able to accurately measure the frequency and resistance of 3 channels simultaneously while we perform long assays in a flow-cell. The passive I/O board and software for the instrument allow us to control external pump and valve, fully automating the assay."
"The RQCM System is very flexible in terms of controlling external devices, has performed very well and I would certainly recommend it."
Dr. Xueyuan Zhang, Dept. of Material Science, Lawrence Berkeley National Laboratory
"I would certainly recommend the RQCM not only to measure the mass change, but it can also give the resistance change, which is better to analyze the character of the surface film on the crystal."
"I have used a QCMD, but choose the RQCM due to functions, accuracy & price."
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