Mixed cellulose ester (MCE) filters, used routinely to collect dust samples from air for fiber analysis, are the only filter type that can be prepared for both phased contrast microscopy and transmission electron microscopy analyses. However, whenever fiber counts require collecting dust masses <100 μg on a single filter under variable relative humidity (RH) conditions, historically noted effects of humidity on MCE filter mass can hinder accurate estimates of dust mass, measured as loaded minus unloaded filter mass (M). In this study, a baseline set of hundreds of paired measures of change in RH versus M over different time intervals were obtained over a 5-day period for replicate series of 40 unloaded 37-mm MCE filters under varying RH conditions at a nearly constant temperature. Similar baseline data were obtained for 25-mm MCE filters. Linear regressions fit to these data allow improved estimates of dust mass loaded onto MCE filters from measures of M and RH made before and after loading occurs. Using established theory, these relationships were generalized to address temperature variation as well, and examples of numerical applications are provided.
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http://dx.doi.org/10.1093/annhyg/mer003 | DOI Listing |
Anal Chem
January 2025
Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States.
This study describes a microfluidic thread-based analytical device (μTAD) capable of in situ mass spectrometric analysis for continuous flow reaction monitoring. Organic reaction screening is foundational to drug discovery. Microfluidic devices are of special interest here because they provide continuous reaction monitoring with advantages such as the use of smaller reagent volumes and short analysis times.
View Article and Find Full Text PDFInt J Biol Macromol
December 2024
Qingdao Sunefire Science & Technology Shares Co., Ltd, Qingdao 266423, China.
Polymers are promising as stabilizers for developing eco-friendly foam extinguishing agents to solve the imminent pollution problem of fluorinated ones. Present work aims to elucidate the mechanisms by which polymers influence the performance of non-fluorinated foams. Specifically, it investigates the effects of three polymers-xanthan gum (XG), sodium carboxymethyl cellulose (CMCNa), and gelatin (GEL) on surface tension, conductivity, viscosity, foamability, foam stability, and rheology of the siloxane-based Gemini/sodium alpha-alkenyl sulfonate mixture.
View Article and Find Full Text PDFPrecis Chem
December 2024
Department of Chemistry, New Cornerstone Science Laboratory, Institute of Biomimetic Materials & Chemistry, Anhui Engineering Laboratory of Biomimetic Materials, Division of Nanomaterials & Chemistry, Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.
One-dimensional (1D) functional nanowires are widely used as nanoscale building blocks for assembling advanced nanodevices due to their unique functionalities. However, previous research has mainly focused on nanowire functionality, while neglecting the structural stability and damage resistance of nanowire assemblies, which are critical for the long-term operation of nanodevices. Biomaterials achieve excellent mechanical stability and damage resistance through sophisticated structural design.
View Article and Find Full Text PDFFood Chem
December 2024
Food and Soft Materials Research Group, Department of Chemistry and Biology, Toronto Metropolitan University, Toronto, Canada. Electronic address:
This study investigated the oleogelation of cellulose bead dispersions in a sunflower oil oleogel made with solvent-transferred whey protein isolate. The microstructure and rheology of the mixed gels depended on the ratio of hydrated cellulose beads to proteins (9:1, 8:2, 7:3, and 1:1). Two gel stabilization mechanisms were identified.
View Article and Find Full Text PDFSci Rep
December 2024
Department of Horticulture and Landscape Architecture, Colorado State University, Fort Collins, CO, 80526, USA.
Phytophthora blight caused by Phytophthora capsici is a serious disease affecting a wide range of plants. Biochar as a soil amendment could partially replace peat moss and has the potential to suppress plant diseases, but its effects on controlling phytophthora blight of container-grown peppers have less been explored, especially in combination of biological control using Trichoderma. In vitro (petri dish) and in vivo (greenhouse) studies were conducted to test sugarcane bagasse biochar (SBB) and mixed hardwood biochar (HB) controlling effects on pepper phytophthora blight disease with and without Trichoderma.
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