Effects of Pentanol Isomers on the Growth of SDS Micelles in 0.5 M NaCl

and, Kristen L. Thimons†; Brazdil, Linda C.; Harrison, D. E.; Fisch, Michael R.

doi:10.1021/jp9727862

Cited by 20 publications

(13 citation statements)

References 31 publications

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“…All samples were assumed to be composed of monodisperse prolate ellipsoidal supramolecular aggregates, having an effective charge Z and interacting according to a screened Coulomb potential. The adopted model is consistent with the available literature data on SDS/PeOH aggregates in the investigated concentration range, which show a preferential growth along one axis. − The only exception with respect to this model is represented by the XYL-SPX* system, that is, the xylene-in-D 2 O microemulsion, because it is well-known that most microemulsions systems are usually characterized by polydisperse spherical aggregates. Figure reports a sketch of the main model used for data analysis, that is, a core–shell aggregate, where a is the major semiaxis, b is the minor semiaxis, and t is the shell thickness.…”

Section: Modeling Of the Aggregates And Data Analysissupporting

confidence: 77%

Nanostructured Surfactant-Based Systems for the Removal of Polymers from Wall Paintings: A Small-Angle Neutron Scattering Study

et al. 2012

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Nanostructured soft matter systems represent effective and long-lasting solutions with respect to traditional and often obsolete methodologies for the conservation of works of art. In particular, complex fluids such as micelles and microemulsions are the most performing media for the removal of organic materials from porous supports, like wall paintings or stones. In this Article, we report on the characterization of two systems, EAPC and XYL, which have shown good to optimal performances in the removal of organic polymers from wall paintings. EAPC is a five-components fluid composed of water, sodium dodecylsulfate (SDS), 1-pentanol (PeOH), propylene carbonate (PC), and ethyl acetate (EA), while XYL is a "classical" o/w microemulsion, where p-xylene droplets are stabilized in water by SDS and PeOH. Small-angle neutron scattering (SANS) with contrast variation is used to infer a detailed picture of the structure of these complex fluids, with a particular focus on the partition of the components between the bulk phase and the nanocompartments. We found that, differently from XYL, the EAPC system is neither a microemulsion nor a simple micellar solution, with the cosolvents partitioned between the dispersing phase and the disperse droplets. These different structural features play a key role in defining the cleaning effectiveness and specifically the kinetics of interaction between the nanofluid and the polymeric coating to be removed, which is of paramount importance for the application in the field. Both of these nanofluids are effective in polymer removal, but EAPC is considerably more efficient and versatile. The composition and the structure at the nanoscale determine the capability of removing a broad range of different polymer coatings from porous materials. A representative case study is here described, addressing a particularly challenging conservative issue, which is the removal of a multilayered aged coating that was irreversibly damaging the pictorial layer of the Annunciation Basilica in Nazareth.

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Section: Modeling Of the Aggregates And Data Analysissupporting

confidence: 77%

Nanostructured Surfactant-Based Systems for the Removal of Polymers from Wall Paintings: A Small-Angle Neutron Scattering Study

et al. 2012

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“…bulk, shell and core) is characterized by a scattering length density (SLD), q bulk , q shell and q core (reported in Table S1). A repulsive structure factor was included and the aggregates were considered as particles interacting with each other according to a Hayter & Penfold screened Coulomb potential described by the NAR-MMSA (non-additive radius multi-component mean sphere approximation) [30][31][32][33][34][35].…”

Section: Sans Fitting Modelmentioning

confidence: 99%

An amine-oxide surfactant-based microemulsion for the cleaning of works of art

Baglioni

Benavides

Berti

et al. 2015

Journal of Colloid and Interface Science

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Surfactant-based aqueous fluids, such as micellar solutions and microemulsions, are effective, safe and selective media for cleaning operations in conservation of cultural heritage. The search for better-performing systems and eco-friendly cleaning systems is currently a major goal in conservation science. We report here on a ternary o/w microemulsion, composed of diethyl carbonate (DC) as the oil phase and N,N-Dimethyldodecan-1-amine oxide (DDAO) as the surfactant. DDAO is a well known and widely used detergent and solubilizing agent, selected here for its degradability and eco-compatibility. Due to its nonionic/cationic nature, it can be used also when nonionic-based formulations become ineffective because of clouding and phase separation. Moreover, DDAO is insensitive to the presence of divalent metal ions, usually abundant in wall paintings substrates. Small-Angle Neutron Scattering (SANS) provided detailed information about the nanostructure of the surfactant aggregates. Finally, the cleaning effectiveness of the nanofluid was assessed both on fresco mock-ups and on real wall paintings conserved in the archeological site of Tulum, Mexico. Here, conservators successfully used the microemulsion to remove naturally aged films of complex polymer mixtures from the works of art surface.

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“…One important property of PVP is that, at a high concentration of PVP (≥57 wt %) in aqueous solution, H 2 O molecules preferred binding with PVP instead of acting as the solvent, which was referred to as bound H 2 O. 33 36 Therefore, the produced EtOH and H 2 O molecules were unable to timely diffuse into the relatively nonpolar solvent pentanol and were trapped inside the newly formed nanowires. The spaces occupied by these encapsulated small byproducts became the hollow parts of the nanowire after workup.…”

Section: Formation Process Of Hnsnsmentioning

confidence: 99%

Shape-Tunable Hollow Silica Nanomaterials Based on a Soft-Templating Method and Their Application as a Drug Carrier

Chen

Hou

et al. 2014

ACS Appl. Mater. Interfaces

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A one-step soft-templating method for synthesizing shape-tunable hollow silica nanomaterials was developed in a reliable and highly reproducible way. For the first time, both nonspherical and spherical shapes with hollow interiors, including nanowire, nanospheres, and nanotadpole, were successfully obtained by simply changing the solvent. Poly(vinylpyrrolidone) (PVP)-water droplets were used as soft templates for the formation of hollow structures, while three different solvents, including 1-propanol, 1-pentanol, and ethanol, led to the designed shapes. It was found that the solvent, the formation of PVP-water droplets, the amount of ammonia, and the reaction time had great effects on the morphology of synthesized hollow nanomaterials. The effect of various factors on the morphology was systematically studied to propose a growth mechanism. The obtained hollow silica nanomaterials showed excellent reproducibility and great potential for a large-scale synthesis. Finally, the application of the developed hollow silica nanomaterials was demonstrated using the hollow spherical silica nanoparticles. Its drug-carrying ability was studied. The results could be extended for doping various target molecules into the hollow structures for a broad range of applications.

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Effects of Pentanol Isomers on the Growth of SDS Micelles in 0.5 M NaCl

Cited by 20 publications

References 31 publications

Nanostructured Surfactant-Based Systems for the Removal of Polymers from Wall Paintings: A Small-Angle Neutron Scattering Study

Nanostructured Surfactant-Based Systems for the Removal of Polymers from Wall Paintings: A Small-Angle Neutron Scattering Study

An amine-oxide surfactant-based microemulsion for the cleaning of works of art

Shape-Tunable Hollow Silica Nanomaterials Based on a Soft-Templating Method and Their Application as a Drug Carrier

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