MODIFICATION
66 -- Variable Angle Light Scattering Instrument
- Notice Date
- 7/5/2002
- Notice Type
- Modification
- Contracting Office
- Department of Commerce, National Institute of Standards and Technology (NIST), Acquisition and Logistics Division, 100 Bureau Drive, Building 301, Room B129, Mail Stop 3571, Gaithersburg, MD, 20899-3571
- ZIP Code
- 20899-3571
- Solicitation Number
- NA1341-02-Q-0547
- Response Due
- 7/15/2002
- Archive Date
- 7/30/2002
- Point of Contact
- Joni Laster, Purchasing Agent, Phone 301-975-8397, Fax 301-975-8884, - Carol Wood, Contract Specialist, Phone 301-975-8172, Fax 301-975-8884,
- E-Mail Address
-
joni.laster@nist.gov, carol.wood@nist.gov
- Description
- Amendment 01 to Solicitation NA1341-02-Q-0547 Solicitation NA1341-02-Q-0547 dated June 20, 2002 has been amended to address the following vendor questions and statements as well as to extend the due date for offers to be July 15, 2002 at 3:00pm. ***Statement: The National Institute of Standards and Technology appears to be purchasing an instrument, under the above-reference solicitation, that is about out of date. We find it virtually impossible to bid on the procurement because it specifically references an out of date device of little current utility in the rapidly burgeoning field of particle characterization. Answer: This instrument will not be solely used for particle size characterization. Instead, the research is directed at making light-scattering materials property measurements for a wide range of complex materials. The specifications stated in the solicitation should allow us to make measurements at a higher degree of precision and accuracy than any known commercial apparatus. According to the light scattering principle, small measurable, reliable angle provides larger probing length scale. Correspondingly, larger angle measurements give a smaller probing scale. It is critical to have these capabilities so that we can ensure the precise and accurate measurements of large length scale structure. If an offeror can build an instrument that performs at measurement angles less than 5 degree, it will be a plus. These specifications, therefore, should be viewed as being minimally acceptable for our needs. ***Question: Missing from the solicitation are all details describing the types of particles (molecules?) the instrumentation is to measure. Answer: This instrument will not be solely used for particle size characterization. Instead, the research is directed at making light-scattering materials property measurements for a wide range of complex materials.*** Question: What is the range of sizes to be examined? Answer: The measurement size scale mentioned in the specifications refer to measurable length scale and is not limited to particle size measurement. ***Question: What are the physical properties of such particles? Shape? Chemical composition? Structure?Answer: It is not only for "Particles" and physical properties vary.*** Question: In addition, what fluids will be used as carriers? Water? Buffering? Chemical composition? Answer: We will use a large variety of fluids as carriers, most of systems could be multi-component and concentrations could be higher than 70%. ***Question: Are size distributions of importance? Answer: If it is particle size measurements, this issue would be important. ***Question: Will the unit examine fractions of separated samples? Answer: Not relevant to the specification.*** Question: How will samples be produced? At what densities/concentrations?Answer: A multiplexity of complex materials systems will be investigated.***Question: Are only hydrodynamic sizes required? Answer: NO.***Question: Is the determination of rotational diffusion coefficients an objective? Answer: No. ***Question: What information is available at 5? that is unavailable at other angles?Answer: According to the light scattering principle, small measurable, reliable angle provides larger probing length scale. Correspondingly, larger angle measurements give a smaller probing scale. It is critical to have these capabilities so that we can ensure the precise and accurate measurements of large length scale structures. If an instrument company that can build an instrument performs at measurement angles less than 5 degree, it will be plus. ***Question: In this day and age of low stray light scattering instrumentation, what is the object of index matching fluids?Answer: The stray light would affect the low angle measurements, when the measurable angle in the range of 5 to 10 degrees. ***Question: What non-toxic fluids have a refractive index of 1.5 (typical glass)?Answer: Oil ***Question: Why is temperature limited to exactly 100? C? Zero C? Why is NIST uninterested in electrical safety of the instrumentation it proposes to purchase?Answer: This instrument is purchased for research purpose not for QC or for some routine practice. The temperature is not limited to "exactly" 100? C? Zero C? . We want a wide range of operational temperatures, the wider the better. Most of our systems may be prepared at temperatures higher than 100 C. The temperature range specified in the proposal should be viewed as being the minimally acceptable range.***Question: How much time is available for measurement?Answer: Not relevant. Fast and accurate measurements are always a plus!***Question: Why does the proposed purchase refer to an instrument with such limited flexibility? Answer: With all the specifications we requested, the required instrument has a great flexibility for our research. Flexibility implies we can use and modify this instrument to our needs. ***
- Web Link
-
Link to FedBizOpps document.
(http://www.eps.gov/spg/DOC/NIST/AcAsD/NA1341-02-Q-0547/listing.html)
- Place of Performance
- Address: 100 Bureau Drive Gaithersburg, Md.
- Zip Code: 20899
- Country: USA
- Zip Code: 20899
- Record
- SN00111695-F 20020707/020706082125 (fbodaily.com)
- Source
-
FedBizOpps.gov Link to This Notice
(may not be valid after Archive Date)
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