scholarly journals Mapping Organic Functional Groups at Nanosurfaces Using Colloidal Gold Conjugation

2021 ◽  
Author(s):  
Nicolas Debons ◽  
Dounia Dems ◽  
Thibaud Coradin ◽  
Carole Aimé
Keyword(s):  
Spatial Distribution ◽  
Functional Groups ◽  
Silica Particle ◽  
Chemical Nature ◽  
Particle Surface ◽  
Complete Understanding ◽  
Gold Colloids ◽  
Chemically Modified ◽  
Organic Functional Groups ◽  
Amine Groups

The functionalization of nanomaterials surface is key to improve their stability, reactivity and confer specific properties. However, mapping functional groups at the nanoscale remains difficult, <i>i.e.</i> identifying chemical nature but also spatial distribution. It is particularly challenging for organic groups and non-planar objects such as nanoparticles. Here we report a strategy for mapping amine groups on the surface of silica particles using chemically-modified gold colloids, which are used as tags to specifically and spatially identify these organic groups under electron microscopy. A complete understanding of the correlation between spatial distribution of gold colloids and chemical state of the silica particle surface (by XPS) is presented. The range of reliability of this strategy for mapping organic groups at nanointerfaces is assessed and its implications for biofunctional nanoobjects where interdistance of biomolecules are of paramount importance are discussed.

scholarly journals Mapping Organic Functional Groups at Nanosurfaces Using Colloidal Gold Conjugation

2021 ◽  
Author(s):  
Nicolas Debons ◽  
Dounia Dems ◽  
Thibaud Coradin ◽  
Carole Aimé
Keyword(s):  
Spatial Distribution ◽  
Functional Groups ◽  
Silica Particle ◽  
Chemical Nature ◽  
Particle Surface ◽  
Complete Understanding ◽  
Gold Colloids ◽  
Chemically Modified ◽  
Organic Functional Groups ◽  
Amine Groups

The functionalization of nanomaterials surface is key to improve their stability, reactivity and confer specific properties. However, mapping functional groups at the nanoscale remains difficult, <i>i.e.</i> identifying chemical nature but also spatial distribution. It is particularly challenging for organic groups and non-planar objects such as nanoparticles. Here we report a strategy for mapping amine groups on the surface of silica particles using chemically-modified gold colloids, which are used as tags to specifically and spatially identify these organic groups under electron microscopy. A complete understanding of the correlation between spatial distribution of gold colloids and chemical state of the silica particle surface (by XPS) is presented. The range of reliability of this strategy for mapping organic groups at nanointerfaces is assessed and its implications for biofunctional nanoobjects where interdistance of biomolecules are of paramount importance are discussed.

scholarly journals Spatial distribution of organic functional groups supported on mesoporous silica nanoparticles: a study by conventional and DNP-enhanced 29Si solid-state NMR

2017 ◽  
Vol 19 (3) ◽  
pp. 1781-1789 ◽  
Author(s):  
Takeshi Kobayashi ◽  
Dilini Singappuli-Arachchige ◽  
Zhuoran Wang ◽  
Igor I. Slowing ◽  
Marek Pruski
Keyword(s):  
Spatial Distribution ◽  
Solid State ◽  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Functional Groups ◽  
Solid State Nmr ◽  
Mesoporous Silica Nanoparticles ◽  
Spatial Distributions ◽  
Organic Functional Groups

DNP-enhanced solid-state NMR determined spatial distributions of organic functionalities attached to surfaces of mesoporous silica nanoparticles via co-condensation and grafting.

scholarly journals Organic functional groups in aerosol particles from burning and non-burning forest emissions at a high-elevation mountain site

2011 ◽  
Vol 11 (1) ◽  
pp. 2655-2696 ◽  
Author(s):  
S. Takahama ◽  
R. E. Schwartz ◽  
L. M. Russell ◽  
A. M. Macdonald ◽  
S. Sharma ◽  
...  
Keyword(s):  
Functional Groups ◽  
Organic Aerosol ◽  
High Elevation ◽  
Ambient Particles ◽  
Aerosol Mass ◽  
Organic Functional Groups ◽  
Peak Location ◽  
Amine Groups ◽  
Regional Forest ◽  
A Site

Abstract. Ambient particles collected on teflon filters at the Peak of Whistler Mountain, British Columbia (2182 m a.s.l.) during spring and summer 2009 were measured by Fourier transform infrared (FTIR) spectroscopy for organic functional groups (OFG). The project mean and standard deviation of organic aerosol mass concentrations (OM) for all samples was 3.2±3.3 (μg m−3). The OM was dominated by regional forest sources, burning, and non-burning that occurred mostly during June–September. On average, organic hydroxyl, alkane, carboxylic acid, ketone, and amine, groups represented 31%±11%, 34%±9%, 23%±6%, 6%±7%, and 6%±3% of OM, respectively. Ketone groups were associated with the forest aerosols and represented up to 27% of the OM in these aerosols. Additional measurements of aerosol mass fragments, size, and number concentrations were used to separate fossil-fuel combustion and burning and non-burning forest sources of the measured organic aerosol. The OM concentrations observed at Whistler Peak during this campaign were higher than those measured during a shorter period in the spring of 2008 at a site in Whistler valley, over one km lower than the peak location. The 2009 campaign was largely influenced by the wildfire emissions that were absent during the 2008 campaign.

scholarly journals Organic functional groups in aerosol particles from burning and non-burning forest emissions at a high-elevation mountain site

2011 ◽  
Vol 11 (13) ◽  
pp. 6367-6386 ◽  
Author(s):  
S. Takahama ◽  
R. E. Schwartz ◽  
L. M. Russell ◽  
A. M. Macdonald ◽  
S. Sharma ◽  
...  
Keyword(s):  
Functional Groups ◽  
Organic Aerosol ◽  
High Elevation ◽  
Ambient Particles ◽  
Aerosol Mass ◽  
Secondary Formation ◽  
Organic Functional Groups ◽  
Aerosol Fraction ◽  
Biomass Burning Aerosol ◽  
Amine Groups

Abstract. Ambient particles collected on teflon filters at the Peak of Whistler Mountain, British Columbia (2182 m a.s.l.) during spring and summer 2009 were measured by Fourier transform infrared (FTIR) spectroscopy for organic functional groups (OFG). The project mean and standard deviation of organic aerosol mass concentrations (OM) for all samples was 3.2±3.3 (μg m−3). Measurements of aerosol mass fragments, size, and number concentrations were used to separate fossil-fuel combustion and burning and non-burning forest sources of the measured organic aerosol. The OM was composed of the same anthropogenic and non-burning forest components observed at Whistler mid-valley in the spring of 2008; during the 2009 campaign, biomass burning aerosol was additionally observed from fire episodes occurring between June and September. On average, organic hydroxyl, alkane, carboxylic acid, ketone, and primary amine groups represented 31 %±11 %, 34 %±9 %, 23 %±6 %, 6 %±7 %, and 6 %±3 % of OM, respectively. Ketones in aerosols were associated with burning and non-burning forest origins, and represented up to 27 % of the OM. The organic aerosol fraction resided almost entirely in the submicron fraction without significant diurnal variations. OM/OC mass ratios ranged mostly between 2.0 and 2.2 and O/C atomic ratios between 0.57 and 0.76, indicating that the organic aerosol reaching the site was highly aged and possibly formed through secondary formation processes.

The Swiss army knife of biological catalysis: A compact toolkit of organic functional groups

Complexity ◽  
2006 ◽  
Vol 11 (3) ◽  
pp. 9-10 ◽  
Author(s):  
Harold J. Morowitz ◽  
Vijayasarathy Srinivasan ◽  
Eric Smith
Keyword(s):  
Functional Groups ◽  
Organic Functional Groups ◽  
Biological Catalysis

Colorimetric methods for determining organic functional groups. II

1969 ◽  
Vol 57 (4) ◽  
pp. 821-825 ◽  
Author(s):  
Walter L. Nazimowitz ◽  
T. S. Ma
Keyword(s):  
Functional Groups ◽  
Organic Functional Groups ◽  
Colorimetric Methods

Electronic and optical properties of surface-functionalized armchair graphene nanoribbons

RSC Advances ◽  
2016 ◽  
Vol 6 (28) ◽  
pp. 23974-23980 ◽  
Author(s):  
Min Wang ◽  
Si Xing Song ◽  
Hai Xing Zhao ◽  
Yu Chen Wang
Keyword(s):  
Optical Properties ◽  
Spatial Distribution ◽  
Functional Groups ◽  
Graphene Nanoribbons ◽  
Electronic And Optical Properties ◽  
Armchair Graphene Nanoribbons ◽  
Armchair Graphene

The functional groups on armchair graphene nanoribbons affect the spatial distribution of the wavefunction and influence the electronic and optical properties as well.

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