In Situ FTIR-ATR Analysis and Titration of Carboxylic Acid-Terminated SAMs

Gershevitz, Olga; Sukenik, Chaim N.

doi:10.1021/ja037610u

Cited by 147 publications

(175 citation statements)

References 43 publications

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“…Such an effect may be due to hydrogen bonding between the different headgroups. PA has a carboxyl headgroup with a pKa of ~8.7 on pure water [70,71]. The surface pKa of carboxylic acids differs greatly from the bulk value (~4.5).…”

Section: Surface Pressure-area Isothermsmentioning

confidence: 99%

Palmitic Acid on Salt Subphases and in Mixed Monolayers of Cerebrosides: Application to Atmospheric Aerosol Chemistry

Adams

Allen

2013

Atmosphere

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Palmitic acid (PA) has been found to be a major constituent in marine aerosols, and is commonly used to investigate organic containing atmospheric aerosols, and is therefore used here as a proxy system. Surface pressure-area isotherms (π-A), Brewster angle microscopy (BAM), and vibrational sum frequency generation (VSFG) were used to observe a PA monolayer during film compression on subphases of ultrapure water, CaCl 2 and MgCl 2 aqueous solutions, and artificial seawater (ASW). π-A isotherms indicate that salt subphases alter the phase behavior of PA, and BAM further reveals that a condensation of the monolayer occurs when compared to pure water. VSFG spectra and BAM images show that Mg . π-A isotherms and BAM were also used to monitor mixed monolayers of PA and cerebroside, a simple glycolipid. Results reveal that PA also has a condensing effect on the cerebroside monolayer. Thermodynamic analysis indicates that attractive interactions between the two components exist; this may be due to hydrogen bonding of the galactose and carbonyl headgroups. BAM images of the collapse structures show that mixed monolayers of PA and cerebroside are miscible at all surface pressures. These results suggest that the surface morphology of organic-coated aerosols is influenced by the chemical composition of the aqueous core and the organic film itself.

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Section: Surface Pressure-area Isothermsmentioning

confidence: 99%

Palmitic Acid on Salt Subphases and in Mixed Monolayers of Cerebrosides: Application to Atmospheric Aerosol Chemistry

Adams

Allen

2013

Atmosphere

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“…6(c), the rate constant reached a maximum value of 1.4 × 10 -3 s -1 , some 2.4 times larger than the value for the unfunctionalized catalyst. It is possible that the carboxylate group of 3-MPA present under the basic conditions of the reaction can form strong hydrogen bonds with o-nitroaniline [37], and give a longer retention time of the reactants on the active gold surface yielding higher reaction rates. The rate constant decreased at high 3-MPA concentrations, presumably because of blocking of the exposed gold surface to the reactants.…”

Section: Tuning Of Surface Functionality Of the Gold Cores In Au@sio mentioning

confidence: 99%

Metal@Silica yolk-shell nanostructures as versatile bifunctional nanocatalysts

2010

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Recent developments in nanochemistry offer precise morphology control of nanomaterials, which has significant impacts in the field of heterogeneous catalysis. Rational design of bifunctional catalysts can influence various aspects of catalytic properties. In this review, a new class of bifunctional catalysts with a metal@silica yolk-shell nanostructure is introduced. This structure has many advantages as a heterogeneous catalyst since it ensures a homogeneous environment around each metal core, and particle sintering is effectively eliminated during high temperature reactions. The catalysts exhibit high activity and recyclability in gas-and solution-phase reactions. It is anticipated that appropriate selection of bifunctional components and optimal structural control will significantly further enhance the catalytic properties, and enable target reaction-oriented development of new catalysts.

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“…The FTIR (ATR) spectra of all the 36 nail samples were scanned in the spectral range 2000-500 cm -1 [33][34]. In the sample No.6 peak at 1514 cm -1 shifted from 1517 cm -1 , sample no.…”

Section: Ft-ir Atr Spectrummentioning

confidence: 99%

Non-destructive technique for individualizing trace evidence analysis of tiger nail

Italiya¹,

Ansari²,

Menon³

2017

Forensic Sci Crimino

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Tigers are on the brink of extinction. The greatest threat comes from criminals who control an illegal trade spanning countries and continents. Those animals are illegally killed or poached owing to the high value of their fleece on the black market, and their body parts are used in traditional medicines and jewellery articles. The illegal trade in tiger and lion are one of the most high profile, destructive and urgent forms of wildlife crime. The enforcement response needs to employ advanced, intelligence-led methods of investigation and the engagement of the whole criminal justice system. The response must target the individuals who control this lucrative trade and bring them to justice, and also seize any assets obtained through their crimes. Tiger nail evidence as one of such criteria can provide important information for crime investigation. The present study deals with the new non-destructive technique namely FTIR-ATR (Fourier transform infrared spectroscopy-Attenuated total reflection) and VSC (video spectral comparator) analysis of the Royal Bengal Tiger claw (nail) applied for the first time in wildlife crime investigation especially in a forensic context.

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In Situ FTIR-ATR Analysis and Titration of Carboxylic Acid-Terminated SAMs

Cited by 147 publications

References 43 publications

Palmitic Acid on Salt Subphases and in Mixed Monolayers of Cerebrosides: Application to Atmospheric Aerosol Chemistry

Palmitic Acid on Salt Subphases and in Mixed Monolayers of Cerebrosides: Application to Atmospheric Aerosol Chemistry

Metal@Silica yolk-shell nanostructures as versatile bifunctional nanocatalysts

Non-destructive technique for individualizing trace evidence analysis of tiger nail

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