Challenges in Characterizing Small Particles Exploring Particles from the Nano- to Microscale: A Workshop Summary (2012) / Chapter Skim
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B Poster Abstracts
B Poster Abstracts
Pages 63-72
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From page 63... ...
The Atmospheric nanoparticles produced by nucleation can concentrations and distribution of the neutral nucleating clussubsequently grow to cloud condensation nuclei (CCN) ters containing up to 4 H2SO4 are estimated from the above within one or two days and hence affect cloud formation, methods at three measurement sites (NCAR foothill laboraprecipitation, and atmospheric radiation budgets.
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From page 64... ...
nonequilibrium dynamics within material systems, including However, there has been little success with identifying nano small particles. However, existing XPCS facilities are limited sized engineered and incidental particles from complex het to microstructure length scales smaller than 50 nanometers, erogeneous environmental samples, limiting our understand eliminating large classes of materials of technological imporing of their environmental fate and influence.
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From page 65... ...
Larabell13,4 1School of Chemical Engineering, Purdue University, 1Department of Anatomy, University of California San West Lafayette, IN 47906 Francisco, San Francisco, CA 94143, USA 2Electron Microscopy Unit Bio21, Molecular Science The understanding of interaction forces that arise when particles and surfaces come into close contact continues to and Biotechnology Institute, University of Melbourne, Melbe a significant focus of research. It can benefit many areas bourne, VIC 3010, Australia 3National Center for X-ray Tomography, Lawrence Berkeof study particularly in the pharmaceutical, chemical, and mineral industries involving solid processing.
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From page 66... ...
We present results based on complementary physical For example, identification of mechanisms associated with c haracterization methods performed under both fluid- transformations requires the direct observation of the reacbased and aerosolized conditions in order to interrogate the tions to develop the atom-by-atom model of the structural molecular conjugation and colloidal stability of nanoscale and chemical changes. Recently we introduced a laboratoryparticles.
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From page 67... ...
Particle concentration and or small molecules to adjust the surface charge and polarity. chemical composition were measured simultaneously using scanning mobility and aerodynamic particle sizers, two aerosol mass spectrometers, and two integrative sampling techniques (impaction on either ZnSe discs with subsequent analysis by Fourier transform infrared spectroscopy or on quartz-fiber filters followed by liquid chromatography with UV-vis detection)
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From page 68... ...
. Ambient PM2.5 with high Ni of "nanoparticles" and the realization of their potential content induced elevated systemic inflammatory markers and applications in defense, energy, environment and health reduced EPCs.
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From page 69... ...
Although methods for measuring formation and growth from the gas phase reaction of MSA sizes and concentrations N of newly formed particles of with organic amines. These studies are performed using a diameter greater than 3 nm are well established, measure- unique flow tube system equipped with an electrical aerosol ments of nanoparticles and neutral molecular clusters smaller analyzer and an scanning mobility particle sizer (SMPS)
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From page 70... ...
Results indicated to develop standardized dispersion protocols for ENMs in that arteries from NHNP mice showed statistically significant biological and environmental test media, and to evaluate differences in contractile and relaxation responses compared current practices; research to assess the physicochemical to those from FA mice. Oxidative stress and inflammation in stability of nanoscale Ag and Au in biological and environthe pulmonary and extrapulmonary system indicated dam- mental matrices; measurements to characterize and quantify age, and the degree of plaque formation was determined in the amount, conformation, and distribution of surface-bound the ascending aorta.
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From page 71... ...
, a special type of SPM based understand these impacts. Secondary organic aerosols (SOAs)
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