Spread Monolayer

Chattoraj, D. K.; Birdi, K. S.

doi:10.1007/978-1-4615-8333-2_6

Cited by 3 publications

(2 citation statements)

References 105 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A pure monolayer is composed of only one type of surfactant at the air–water interface, whereas a mixed monolayer contains a combination of two or more surfactants . Due to the immense diversity in sources from which atmospheric and oceanic organic molecules originate, mixed monolayer films are more suitable for the purpose of representing sea spray aerosol and the SSML.…”

Section: Resultsmentioning

confidence: 99%

“…Immiscibility of two or more surfactants can create two-dimensional domains, which are island-like structures on the water’s surface. This is in contrast to a miscible film, in which two or more types of surfactants mix to form an ideal homogeneous film . In 2015, Lee et al conducted a study to determine the best method for creating a homogeneously mixed multicomponent monolayer that contained OA and other surfactants .…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Zinc–Carboxylate Binding in Mixed Octadecanoic Acid and Octadecanol Monolayers on Proxy Seawater Solution Surfaces

Auvil

Vasquez

Allen

2021

ACS Earth Space Chem.

View full text Add to dashboard Cite

Organic coatings on sea spray aerosol are largely comprised of fatty acids in addition to a vast array of other organic molecules including fatty alcohols. The seawater from which sea spray aerosol originates contains metal ions that interact with the organic coating at the air–seawater interface, resulting in transport of these metals into the atmosphere. Metal binding within single-substance monolayers on aqueous solutions has been previously studied. However, such binding events within mixed monolayers, especially those of ocean-relevant ratios, are not well-explored. Here, we examine four monolayer ratios of octadecanoic acid (stearic acid) to octadecanol (stearyl alcohol) on aqueous solutions with varying ZnCl2 concentrations and a seawater-relevant NaCl concentration of 0.465 M. Surface pressure–area (Π-A) isotherms and infrared reflection–absorption spectroscopy (IRRAS) are used to quantify the Zn2+–carboxylate surface binding affinities for each monolayer composition. We find that Zn2+–carboxylate binding is enhanced by ∼300 times at the surface when compared to the bulk solution. Addition of 10% octadecanol reduces the apparent surface binding affinity by over 50% from 3.6 × 103 to 1.4 × 103 M–1; this is significantly more than predicted from the slight reduction in viable 1:1 binding sites. Furthermore, 1:2 Zn2+–carboxylate binding is shown to only be viable for the 100 and 95% fatty acid film, whereas 1:1 binding is observed for all film ratios investigated.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Zinc–Carboxylate Binding in Mixed Octadecanoic Acid and Octadecanol Monolayers on Proxy Seawater Solution Surfaces

Auvil

Vasquez

Allen

2021

ACS Earth Space Chem.

View full text Add to dashboard Cite

show abstract

Order of Dry and Wet Mixed-Length Self-Assembled Monolayers

Barrett

Petersen

2015

J. Phys. Chem. C

View full text Add to dashboard Cite

Functionalizing the surface of metal and oxide materials with self-assembled monolayers is an elegant method for tuning the chemical properties of the surfaces. The properties of a coated surface depend on both the chemical nature of the termination as well as the order of the monolayer. One commonly used platform is alkylsilanes on silica surfaces. Here we characterize the disorder of self-assembled monolayers having a mixture of two monomer lengths using sum-frequency generation (SFG) and Fourier transform infrared spectroscopy. We find that mixed monolayer order varies smoothly as a function of composition. The mixed monolayers are more disordered than either pure monolayer, and of the pure monolayers, the shorter monolayer is more disordered. The nonlinear relationship between monolayer disorder and composition, along with atomic force microscopy images, suggests completely homogeneous mixing or very small domains of the monomers. The order of the monolayers as determined by SFG spectroscopy does not depend on whether the monolayer is in contact with air or water.

show abstract

Self-Setting Calcium Phosphate Cements with Tunable Antibiotic Release Rates for Advanced Antimicrobial Applications

Ghosh

Pernal

et al. 2016

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Osteomyelitis, an infectious disease predominantly tied to poor sanitary conditions in underdeveloped regions of the world, is in need of inexpensive, easily in situ synthesizable and administrable materials for its treatment. The results of this study stem from the attempt to create one such affordable and minimally invasive therapeutic platform in the form of a self-setting, injectable cement with a tunable drug release profile, composed of only nanoparticulate hydroxyapatite, the synthetic version of the bone mineral. Cements comprised two separately synthesized hydroxyapatite powders, one of which, HAP2, was precipitated abruptly, retaining the amorphous nature longer, and the other one of which, HAP1, was precipitated at a slower rate, more rapidly transitioning to the crystalline structure. Cements were made with four different weight ratios of the two hydroxyapatite components: 100/ 0, 85/15, 50/50, and 0/100 with respect to HAP1 and HAP2. Both the setting and the release rates measured on two different antibiotics, vancomycin and ciprofloxacin, were controlled using the weight ratio of the two hydroxyapatite components. Various inorganic powder properties were formerly used to control drug release, but here we demonstrate for the first time that the kinetics of the mechanism of formation of a solid compound can be controlled to produce tunable drug release profiles. Specifically, it was found that the longer the precursor calcium phosphate component of the cement retains the amorphous nature of the primary precipitate, the more active it was in terms of speeding up the diffusional release of the adsorbed drug. The setting rate was, in contrast, inversely proportional to the release rate and to the content of this active hydroxyapatite component, HAP2. The empirical release profiles were fitted to a set of equations that could be used to tune the release rate to the therapeutic occasion. All of the cements loaded with vancomycin or ciprofloxacin inhibited the growth of Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli and Pseudomonas aeruginosa in both agar diffusion assays and broth dilution tests with intensities either comparable to the antibiotic per se, as in the case of ciprofloxacin, or even larger than the antibiotic alone, as in the case of vancomycin. Interestingly, even the pure cements exhibited an antibacterial effect ranging from moderate to strong, while demonstrating high levels of biocompatibility with osteoclastic RAW264.7 cells and only slightly affecting the viability of the osteoblastic MC3T3-E1 cells, in direct proportion with the amount of the more active hydroxyapatite component in the cements. This antibacterial effect was especially noticeable against Gram-negative bacteria, where the growth inhibition by the cements was comparable to or even stronger than that of the pure antibiotics. The antibiofilm assay against P. aeruginosa biofilms reiterated the antibiotic effectiveness of pure, antibiotic-free cements. That the carrier per se, composed of a nontoxic, ...

show abstract

Spread Monolayer

Cited by 3 publications

References 105 publications

Zinc–Carboxylate Binding in Mixed Octadecanoic Acid and Octadecanol Monolayers on Proxy Seawater Solution Surfaces

Zinc–Carboxylate Binding in Mixed Octadecanoic Acid and Octadecanol Monolayers on Proxy Seawater Solution Surfaces

Order of Dry and Wet Mixed-Length Self-Assembled Monolayers

Self-Setting Calcium Phosphate Cements with Tunable Antibiotic Release Rates for Advanced Antimicrobial Applications

Contact Info

Product

Resources

About