Aggregation kinetics of latex microspheres in alcohol–water media

Odriozola, Gerardo; Schmitt, A.; Callejas-Fernández, J.; Hidalgo‐Álvarez, R.

doi:10.1016/j.jcis.2007.02.018

Cited by 12 publications

(5 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, a slight (8 mV) decrease in the ζ-potential (corresponding to 0.25 μm cm/s electrophoretic mobility change, Supporting Information Figure S3) can be observed in the range of 5–40 μL of EtOH (Figure b). A similar dependence of the ζ-potential on EtOH addition was reported earlier for pigment particles, and the initial drop was attributed to the modified structure of the electric double layer or the dielectric constant decrease in the vicinity of the particle due to the presence of EtOH molecules . However, it was also shown that adsorption of EtOH molecules can induce a conformation change of surface-bound citrate molecules by disruption of intermolecular hydrogen bonds and can also promote the desorption of loosely bound (dangling) citrate molecules that are associated with surface-adsorbed citrates via hydrogen bonding .…”

Section: Resultssupporting

confidence: 80%

“…A similar dependence of the ζ-potential on EtOH addition was reported earlier for pigment particles, and the initial drop was attributed to the modified structure of the electric double layer 33 or the dielectric constant decrease in the vicinity of the particle due to the presence of EtOH molecules. 34 However, it was also shown that adsorption of EtOH molecules can induce a conformation change of surfacebound citrate molecules by disruption of intermolecular hydrogen bonds and can also promote the desorption of loosely bound (dangling) citrate molecules that are associated with surface-adsorbed citrates via hydrogen bonding. 35 The observed minimum in the ζ-potential in Figure 4b agrees well with the above considerations, indicating that due to EtOH an additional small fraction of citrate molecules contributes to a more negative surface potential, whereas some of the molecules are removed at higher concentration resulting in a more positive value.…”

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

SERS Activity of Reporter-Particle-Loaded Single Plasmonic Nanovoids

et al. 2018

View full text Add to dashboard Cite

Signal enhancement related to indentations in a gold surface layer during micro-Raman scattering experiments was investigated. The indentations were prepared based on colloidal templating and the voids filled with 4mercaptobenzoic acid (MBA)-loaded gold nanospheres. The periodic void structure has been designed to allow selective excitation of a single void in such a way that at the laser wavelength of the micro-Raman setup the cavity-type plasmon modes localized at the metallic void interface can be effectively excited. The surface modification of the gold particles by MBA was studied in detail, and the number of MBA molecules present on a single gold nanoparticle inferred from optical and electrophoretic-mobility measurements was found to be ca. 210. Correlative scanning electron microscopy and micro-Raman measurements allowed the investigations at the single void level. The Raman signal from a single MBA-loaded gold nanoparticle in the cavity was already detectable. The number of particles present at a single void site provided a straightforward way to limit the number of molecules excited during the experiments. By measuring the signal strength as a function of particle number trapped inside a single nanovoid and comparing it with a reference sample (clusters of given number of particles on a flat gold surface), a 25-fold experimental signal enhancement attributed to the nanostructured nature of the interface could be inferred.

show abstract

Section: Resultssupporting

confidence: 80%

Section: ■ Introductionmentioning

confidence: 99%

SERS Activity of Reporter-Particle-Loaded Single Plasmonic Nanovoids

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The driving forces causing the changes in G c and τ c can be understood by considering (1) hydrogen bonding (the hydrogen bonding index (HBI) is about 18 for 1-propanol and ca. 40 for water), (2) hydrophobic interactions, (3) alcohol clustering, and (4) complex ion−water−alcohol structuring (boron-centered anions and sodium cations are present in the PVA−borate hydrogel networks). Separating the role of each of these in determining the strength of the PVA−borate hydrogels when 1-propanol is added will require additional studies.…”

Section: Resultsmentioning

confidence: 99%

Poly(vinyl alcohol)−Borate Hydro/Cosolvent Gels: Viscoelastic Properties, Solubilizing Power, and Application to Art Conservation

et al. 2009

View full text Add to dashboard Cite

We report the development of a new type of hydrogel in which a cosolvent has been added to the water component. The gel networks are based on the well-known poly(vinyl alcohol)-borate systems (PVA-borate). However, it is shown that the rheological and solubilizing properties of the hydrogels can be modified drastically by the addition of a cosolvent. The studies have focused on 1-propanol as the added liquid, although it is shown that others (propylene carbonate, 1-pentanol, cyclohexanone, and 2-butanol) are amenable to making modified hydrogels as well. In addition to the rheological measurements, the gels have been investigated by differential scanning calorimetry (free water index) and determination of their solubilizing power. Finally, the gels have been applied to clean and oxidized varnish (patina) from the surface of a XVI-XVII century oil-on-wood painting by Ludovico Cardi detto il Cigoli. The mode of cleaning by and removal of the PVA-borate water/1-propanol gel from the painted surface demonstrate several advantages over other gels used in art conservation.

show abstract

“…Ethanol was evaporated from the hydrolyzed sol as it might destabilize the latex suspension. 38 The volume of the final solution was adjusted to 22 mL with a pH 2.5 HCl solution to adjust the silicon concentration to 2.90 mol L -1 . The residual amount of ethanol was determined to be less than 5 vol % by 1 H NMR spectroscopy.…”

Section: Methodsmentioning

confidence: 99%

“…Then 20 mL of the HCl solution was added to the mixture and the ethanol was removed under vacuum. Ethanol was evaporated from the hydrolyzed sol as it might destabilize the latex suspension . The volume of the final solution was adjusted to 22 mL with a pH 2.5 HCl solution to adjust the silicon concentration to 2.90 mol L −1 .…”

Section: Methodsmentioning

confidence: 99%

Latex-Templated Silica Films: Tailoring Porosity to Get a Stable Low-Refractive Index

et al. 2010

View full text Add to dashboard Cite

International audiencePorous sol−gel silica films are prepared using different PMMA latex nanoparticles, 30−80 nm in diameter, as sacrificial templates. By changing the size and the content of the latex particles in the deposited silica sol, it was possible for the first time to tailor the porosity of the sol−gel films (uniform pore size and porous fraction from 0.10 to 0.74) independently of their thickness. This is the consequence of a low microporosity in the silica walls as shown by the correspondence between the measured porous fraction after calcination and the starting latex volume fraction. No ethanol capillary condensation occurs in these films before high partial pressure (above 0.9), leading to a stable refractive index that can be tuned in a large range (from 1.15 to 1.40 at 600 nm). A porosity percolation transition with the opening of the extrinsic pore interconnection was observed at a pore fraction threshold of about 0.40 for different sizes of the initial template. Below the threshold, the films showed a closed porosity structure with a low stable refractive index (down to 1.29 at 600 nm), opening the way to their use for antireflective applications

show abstract

Aggregation kinetics of latex microspheres in alcohol–water media

Cited by 12 publications

References 36 publications

SERS Activity of Reporter-Particle-Loaded Single Plasmonic Nanovoids

SERS Activity of Reporter-Particle-Loaded Single Plasmonic Nanovoids

Poly(vinyl alcohol)−Borate Hydro/Cosolvent Gels: Viscoelastic Properties, Solubilizing Power, and Application to Art Conservation

Latex-Templated Silica Films: Tailoring Porosity to Get a Stable Low-Refractive Index

Contact Info

Product

Resources

About