Powder Sample Collection
Powder Sample Collection - Related Videos
14:20
Absolute Quantum Yield Measurement of Powder Samples
0 Views •
Cited by 16 •
2012
In this video we will demonstrate measuring and calculating absolute quantum yield and chromaticity coordinates directly in powder samples using the Hitachi F-7000 Quantum Yield Measuring System.
08:23
Seawater Sampling and Collection
0 Views •
Cited by 13 •
2009
This video documents methods for collecting coastal marine water samples and processing them for various downstream applications including biomass concentration, nucleic acid purification, cell abundance, nutrient and trace gas analyses.
08:14
Single Crystal and Powder X-ray Diffraction
0 Views •
2023
Source: Tamara M. Powers, Department of Chemistry, Texas A&M University X-ray crystallography is a technique that uses X-rays to study the structure of molecules. X-ray diffraction (XRD) experiments are routinely carried out with either single-crystal or powdered samples. Single-crystal XRD: Single-crystal XRD allows for absolute structure determination. With single-crystal XRD data, the exact atomic positions can be observed, and thus bond lengths and angles can be determined. This...
09:11
Porosimetry of a Silica Alumina Powder
0 Views •
2023
Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA Surface area and pore size distribution are attributes used by adsorbent and catalyst manufacturers and users to ensure quality control and to determine when products are at the end of their useful lives. The surface area of a porous solid is directly related to its adsorption capacity or catalytic activity. The pore size distribution of an adsorbent or catalyst is...
09:13
Diagnostic Necropsy and Selected Tissue and Sample Collection in Rats and Mice
0 Views •
Cited by 49 •
2011
This article describes the procedures for conducting a basic postmortem examination of a mouse or rat, and the collection of basic organs, as well as more challenging sample types from for histological, microbiological, and PCR evaluation.
FAQs
Representativeness depends on more than collecting enough material. Powder can vary within the bulk, so the sampled portion must reflect the material across the selected sampling locations. Segregation can separate particles and make one location unlike another. Collecting appropriate portions from relevant locations therefore reduces the risk that test results describe only a localized region.
Clean tools and containers protect the sample from contamination, while controlled handling helps limit moisture uptake and changes in particle-size distribution. These factors matter because composition, size distribution, flowability, and density may be measured on the collected material. If the sample changes before testing, the result may reflect collection or storage effects rather than the original powder.
Combining increments creates a broader representation of the bulk, whereas careful reduction produces a manageable test portion without losing the intended composition. Both operations require attention to segregation, because careless mixing or division can favor some particle groups. The resulting portion is more useful when it preserves the characteristics that the larger sample was meant to represent.
A practical workflow begins by selecting sampling locations, then collecting powder with clean tools into suitable containers. The collected increments can be combined and reduced carefully before testing. Throughout the process, handlers should limit contamination, moisture uptake, segregation, and particle-size changes. This sequence connects sampling decisions with the reliability of subsequent engineering measurements.
Engineers may collect powder samples to assess composition, particle size, flowability, density, or other material properties. The same approach supports routine quality assessment and checks on manufacturing consistency. Because the sample links a bulk material to laboratory or production measurements, collection quality influences whether the results can support meaningful material evaluation.
In engineering investigations, a collected portion can help identify whether a defect reflects the material or a change in processing consistency. Sampling also supports material validation and process control by providing evidence for comparisons among collected portions. Interpreting those results requires remembering that poor collection can introduce variation, so unexpected measurements should be considered alongside sampling conditions.