AFM and electrochemical study of the effect of dodecylamine on carbon steel corrosion

Chen, Z. Y.; Guo, Xingpeng; Zhang, Q.; Qu, Jun‐e

doi:10.1007/s10853-006-0104-x

Cited by 11 publications

(9 citation statements)

References 14 publications

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“…14.9 Å) of a dodecylamine molecule, it appears that the long‐chain surfactant adapts a bilayer configuration within the gallery space 25. 26 Results from thermogravimetric analysis (TGA) reveal that the amount of interlayer dodecylamine corresponds to approximately 24 wt % of the swollen material.…”

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confidence: 99%

Layered Silicates by Swelling of AMH‐3 and Nanocomposite Membranes

et al. 2007

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Layered materials with nanoporous layers (e.g., , [1][2][3][4] AMH-3 [5,6] ) have structures intermediate between those of crystalline nanoporous frameworks, such as zeolites, and typical layered materials, such as clay minerals. Each layer includes a porous network, while the gallery between layers provides the ability for intercalation, pillaring, and exfoliation. [3][4][5][7][8][9][10][11][12][13] One such material, AMH-3, is the first layered silicate with internal porosity accessible from all directions through eight-membered ring (8 MR) apertures (i.e. pore openings made of eight SiO 4 tetrahedra). [5,6] It has been proposed to use exfoliated silicate layers of AMH-3 as a selectivity-enhancing additive in polymers. [14,15] A recent simulation study provides further motivation for the fabrication of nanocomposites incorporating dispersed AMH-3 layers for gas separation membranes.[16] However, fabrication of nanocomposites has not been demonstrated. Herein, we report on AMH-3 swelling using a novel procedure; the swollen material is used to prepare polymer nanocomposite membranes with improved selectivity.Typically, layered materials can be swollen by the intercalation of organic surfactants, such as quaternary alkyl ammonium ions or amine molecules, by cation exchange or hydrogen-bonding interaction with intergallery moieties. [3,4,[17][18][19][20][21][22][23][24] The swollen derivative of AMH-3 was prepared by intercalation of primary amine molecules (dodecylamine) after proton exchange in the presence of amino acid. In this procedure, an aqueous solution of dl-histidine was employed as a buffer and a source of protons to exchange the strontium and sodium cations in the original structure. The initial pH value was adjusted to be approximately 6.0 by addition of hydrochloric acid, and ion exchange was allowed to proceed at room temperature until the pH value reached approximately 6.4. At this point, the aqueous solution of dodecylamine was added. The swollen AMH-3 was obtained after twelve hours at 60 8C. As will be described in detail elsewhere, several alternative procedures failed to yield swollen AMH-3. A brief account of these attempts is shown in Figure 1.The emergence of a swollen material was monitored by various characterization techniques. ICP (inductively coupled plasma) chemical analysis shows that Na and Sr cations of the original structure (4.8 wt % Na, 20.3 wt % Sr) were exchanged, leaving almost no Na (0.7 wt %) and a smaller Figure 1. AMH-3 structure projection along the b axis showing silicon atoms (Si1, Si2, Si3, and Si4, light sticks), oxygen atoms (dark sticks), sodium cations (Na, single balls), and strontium cations (Sr, double balls). Details on the structure can be found in reference [5]. The arrows indicate attempted ion-exchange and swelling procedures. Only the last procedure, combination of ion exchange in the presence of dlhistidine and swelling using dodecylamine, resulted in swollen AMH-3. CTAB = cetyltrimethylammonium bromide, DTAB = dodecyltrimethylammonium bromide, DOA = do...

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Layered Silicates by Swelling of AMH‐3 and Nanocomposite Membranes

et al. 2007

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“…One can see that the NPs self‐assemble onto the copper TEM grid as a monolayer with a hexagonal order. The average interparticle distance on the grids was measured to be 2.6 nm, which is slightly less than twice the theoretical length of dodecylamine (2.98 nm) 24 indicating that the NPs are effectively functionalized and that the dodecylamine molecules are slightly compressed during ordering of the particles. This compression provides evidence for steric hindrance as the stabilization mechanism.…”

Section: Resultsmentioning

confidence: 81%

Deposition of functionalized gold nanoparticles onto modified silicon substrates

Riskin

Dobbelaere

Elen

et al. 2010

Physica Status Solidi (a)

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In this report, an existing phase transfer method for the synthesis of alkylamine-or alkanethiol-functionalized gold nanoparticles (NPs) is investigated. A parameter study shows that the concentration of the gold salt used is important for the stability of the resulting sol, but has little effect on the final average particle size or the size distribution. By adding dodecanethiol before the reduction, the formation of NPs was inhibited, providing evidence for the autocatalytic pathway for the formation of metallic NPs in wet chemical synthesis proposed in the literature. The resulting functionalized gold NPs are deposited onto Si-OH, octadecyltrichlorosilane (OTS) or 3mercaptopropyltrimethoxysilane modified SiO 2 /Si substrates. scanning electron microscope (SEM) is used to analyze the ordering behavior and surface coverage of the NPs and it is shown that the difference in affinity for the substrate has a profound effect on the deposition behavior. The functionalization of the substrates and of the NPs is confirmed by grazing angle attenuated total reflectance fourier transform infrared spectroscopy (GATR-FTIR).

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“…El AFM permite actualmente cuantificar la topografía de una superficie con elevadas resoluciones laterales y verticales. Esta técnica se ha empezado a emplear en la monitorización de procesos de corrosión tan variados como el estudio de inhibidores en aceros (13), la resistencia a corrosión de aleaciones de aluminio en HCl (14), o la corrosión por picaduras en cobre (15).…”

Section: Introductionunclassified

“…AFM currently allows quantifying surface topography with high lateral and vertical resolution. This technique has begun to be used to monitor a wide range of corrosion processes -e.g., the study of inhibitors in steel (13), corrosion resistance in aluminium alloys in HCl (14), pitting corrosion of copper (15), etc.…”

Section: Introductionmentioning

confidence: 99%