Dendron-stabilised gold nanoparticles: generation dependence of core size and thermal stabilityElectronic supplementary information (ESI) available: TEM images of G1-Au, G2-Au, G3-Au complete with size distribution curves, and characterization data for dendrimers G2SSG2 and G1SSG1 and nanoparticles G1-Au and G2-Au. See http://www.rsc.org/suppdata/jm/b3/b312727c/

2004 ◽  
Vol 14 (5) ◽  
pp. 919 ◽  
Author(s):  
Christine S. Love ◽  
Victor Chechik ◽  
David K. Smith ◽  
Colin Brennan
Keyword(s):  
Gold Nanoparticles ◽  
Size Distribution ◽  
Supplementary Information ◽  
Core Size

scholarly journals Size distribution, mixing state and source apportionment of black carbon aerosol in London during wintertime

2014 ◽  
Vol 14 (18) ◽  
pp. 10061-10084 ◽  
Author(s):  
D. Liu ◽  
J. D. Allan ◽  
D. E. Young ◽  
H. Coe ◽  
D. Beddows ◽  
...  
Keyword(s):  
Linear Regression ◽  
Multiple Linear Regression ◽  
Size Distribution ◽  
Black Carbon ◽  
Coating Thickness ◽  
Urban Site ◽  
Core Size ◽  
Air Masses ◽  
Aerosol Mass ◽  
Mass Median

Abstract. Black carbon aerosols (BC) at a London urban site were characterised in both winter- and summertime 2012 during the Clean Air for London (ClearfLo) project. Positive matrix factorisation (PMF) factors of organic aerosol mass spectra measured by a high-resolution aerosol mass spectrometer (HR-AMS) showed traffic-dominant sources in summer but in winter the influence of additional non-traffic sources became more important, mainly from solid fuel sources (SF). Measurements using a single particle soot photometer (SP2, DMT), showed the traffic-dominant BC exhibited an almost uniform BC core size (Dc) distribution with very thin coating thickness throughout the detectable range of Dc. However, the size distribution of Dc (project average mass median Dc = 149 ± 22 nm in winter, and 120 ± 6 nm in summer) and BC coating thickness varied significantly in winter. A novel methodology was developed to attribute the BC number concentrations and mass abundances from traffic (BCtr) and from SF (BCsf), by using a 2-D histogram of the particle optical properties as a function of BC core size, as measured by the SP2. The BCtr and BCsf showed distinctly different Dc distributions and coating thicknesses, with BCsf displaying larger Dc and larger coating thickness compared to BCtr. BC particles from different sources were also apportioned by applying a multiple linear regression between the total BC mass and each AMS-PMF factor (BC–AMS–PMF method), and also attributed by applying the absorption spectral dependence of carbonaceous aerosols to 7-wavelength Aethalometer measurements (Aethalometer method). Air masses that originated from westerly (W), southeasterly (SE), and easterly (E) sectors showed BCsf fractions that ranged from low to high, and whose mass median Dc values were 137 ± 10 nm, 143 ± 11 nm and 169 ± 29 nm, respectively. The corresponding bulk relative coating thickness of BC (coated particle size/BC core – Dp/Dc) for these same sectors was 1.28 ± 0.07, 1.45 ± 0.16 and 1.65 ± 0.19. For W, SE and E air masses, the number fraction of BCsf ranged from 6 ± 2% to 11 ± 5% to 18 ± 10%, respectively, but importantly the larger BC core sizes lead to an increased fraction of BCsf in terms of mass than number (for W, SE and E air masses, the BCsf mass fractions ranged from 16 ± 6%, 24 ± 10% and 39 ± 14%, respectively). An increased fraction of non-BC particles (particles that did not contain a BC core) was also observed when SF sources were more significant. The BC mass attribution by the SP2 method agreed well with the BC–AMS–PMF multiple linear regression method (BC–AMS–PMF : SP2 ratio = 1.05, r2 = 0.80) over the entire experimental period. Good agreement was found between BCsf attributed with the Aethalometer model and the SP2. However, the assumed absorption Ångström exponent (αwb) had to be changed according to the different air mass sectors to yield the best comparison with the SP2. This could be due to influences of fuel type or burn phase.

Size distribution of gold nanoparticles covered with thiol-terminated cyanobiphenyl-type liquid crystal molecules studied with small-angle X-ray scattering and TEM

2008 ◽  
Vol 460 (1-3) ◽  
pp. 173-177 ◽  
Author(s):  
Kazuyuki Hino ◽  
Rie Shingai ◽  
Takeshi Morita ◽  
Kiyohisa Toku ◽  
Takahiro Hirano ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Liquid Crystal ◽  
Size Distribution ◽  
Small Angle ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

scholarly journals Effect of core size distribution on magnetic nanoparticle harmonics for thermometry

2019 ◽  
Vol 59 (1) ◽  
pp. 010904 ◽  
Author(s):  
Zhongzhou Du ◽  
Yi Sun ◽  
Oji Higashi ◽  
Yuki Noguchi ◽  
Keiji Enpuku ◽  
...  
Keyword(s):  
Size Distribution ◽  
Magnetic Nanoparticle ◽  
Core Size

Empirical expression for harmonics of AC magnetization of magnetic nanoparticles with core size distribution

2019 ◽  
Vol 58 (9) ◽  
pp. 097003 ◽  
Author(s):  
Zhongzhou Du ◽  
Yi Sun ◽  
Oji Higashi ◽  
Keiji Enpuku ◽  
Takashi Yoshida
Keyword(s):  
Magnetic Nanoparticles ◽  
Size Distribution ◽  
Core Size ◽  
Empirical Expression ◽  
Ac Magnetization
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