Controlling the size and surface morphology of carboxylated polystyrene latex particles by ammonium hydroxide in emulsifier-free polymerization

Dong, Hyun Bae; Lee, Sang Yup; Yi, Gi Ra

doi:10.1007/bf03218880

Cited by 12 publications

(11 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nevertheless, directed assembly of colloids by nanoxerography is usually restricted to nanoparticles dispersed in nonpolar solvents. ,,,, As-synthesized aqueous colloidal dispersions are discreetly avoided since the highly polarizable water molecules screen the electric field generated by charge patterns. As a large number of colloids of different materials, shapes, sizes, and surface functionalities are prepared in aqueous medium, − this strongly restricts the range of colloidal nanoparticles that can be effectively assembled by this method. In order to circumvent this, several alternative strategies were attempted in the literature: preparation of water-in-oil emulsions, use of water–alcohol mixtures, transfer to low dielectric organic solvents through ligand-exchange procedures, or addition of surfactants .…”

mentioning

confidence: 99%

Coulomb Force Directed Single and Binary Assembly of Nanoparticles from Aqueous Dispersions by AFM Nanoxerography

et al. 2011

View full text Add to dashboard Cite

We present a simple protocol to obtain versatile assemblies of nanoparticles from aqueous dispersions onto charge patterns written by atomic force microscopy, on a 100 nm thin film of polymethylmethacrylate spin-coated on silicon wafers. This protocol of nanoxerography uses a two-stage development involving incubation of the desired aqueous colloidal dispersion on charge patterns and subsequent immersion in an adequate water-soluble alcohol. The whole process takes only a few minutes. Numerical simulations of the evolution of the electric field generated by charge patterns in various solvents are done to resolve the mechanism by which nanoparticle assembly occurs. The generic nature of this protocol is demonstrated by constructing various assemblies of charged organic/inorganic/metallic (latex, silica, gold) nanoparticles of different sizes (3 to 100 nm) and surface functionalities from aqueous dispersions onto charge patterns of complex geometries. We also demonstrate that it is possible to construct a binary assembly of nanoparticles on a pattern made of positive and negative charges generated in a single charge writing step, by sequential developments in two aqueous dispersions of oppositely charged particles. This protocol literally extends the spectra of eligible colloids that can be assembled by nanoxerography and paves the way for building complex assemblies of nanoparticles on predefined areas of surfaces, which could be useful for the elaboration of nanoparticle-based functional devices.

show abstract

mentioning

confidence: 99%

Coulomb Force Directed Single and Binary Assembly of Nanoparticles from Aqueous Dispersions by AFM Nanoxerography

et al. 2011

View full text Add to dashboard Cite

show abstract

“…The size and shape of latex particles affect the performance of an emulsion. 25 The latex particles in the fluoropolymer emulsion can be roughly observed using a polarizing microscope. In the PM micrograph (Figure 2a), the bright spots are the polymer latex particles, and the dark spots are air bubbles in the emulsion.…”

Section: Resultsmentioning

confidence: 99%

“…The size and shape of latex particles affect the performance of an emulsion . The latex particles in the fluoropolymer emulsion can be roughly observed using a polarizing microscope.…”

Section: Resultsmentioning

confidence: 99%

Fluoropolymer Microemulsion: Preparation and Application in Reservoir Wettability Reversal and Enhancing Oil Recovery

et al. 2021

View full text Add to dashboard Cite

Reservoir wettability is an important factor in the process of reservoir reconstruction. Especially in hydrophilic formation, it is easy to cause a water-locked phenomenon. A new type of fluoropolymer microemulsion was prepared by emulsion polymerization, and its structure and properties were characterized. The average particle size in the prepared emulsion was about 2.0 μm. The emulsion had good stability and wettability reversal performance for the storage of 30 days. After the treatment of 2.0 wt % emulsion, the contact angle between the core and water changed from 26 to 128°, the core surface free energy decreased from 66 to 2.6 mN/m, and the saturated water imbibition amount of the core decreased from 1.38 to 0.15 g. The ability of the fluoropolymer microemulsion to enhance oil recovery was evaluated by the visual displacement experiment. The fluoropolymer microemulsion can increase the displacement efficiency by more than 10%. The wettability of the core changed from hydrophilicity to hydrophobicity, and wettability reversal was achieved.

show abstract

“…In addition, the assembly-induced change of [COO − ]/[COOH] ratio is very promising for designing an acid/base reservoir with self-assembly and shows applications in recyclable acid/base catalysis or pH sensitive smart materials by controlling the assembly and disassembly of the materials. Because self-assembly systems that involve the dissociable functional groups is abundant, for example, peptides, 40 lipids, 41 graphene oxides, 42 cellulose nanocrystals, 43 polymer latex, 44 silica, 45 and so on, the assembly-induced change of the [COO − ]/[COOH] ratio as we found in our system may also occur to different extents, especially when the pH is close to the pK a of the dissociable functional groups; we remind the researchers in this field of this issue.…”

Section: ■ Conclusionmentioning

confidence: 99%

Unraveling Self-Carried Chemical Feedback on Assembly Processes and the Self-Termination of Growth in Au(I)–Thiolate Lamellae

Dai

Yang

et al. 2020

J. Phys. Chem. C

View full text Add to dashboard Cite

The assembly and termination processes of Au(I)–MPA (MPA: 3-mercaptopropanionic acid) self-assembled lamellae have been studied. First, five samples of Au(I)–MPA lamellae with different termination states were prepared by changing the mixing protocols of the reactants. A self-carried chemical feedback on assembly processes was revealed by monitoring and comparing the morphological, compositional, and pH changes in each sample. It is found that the hierarchical growth from molecular species to 1D string-shaped assembly intermediates to 2D lamellae has continuously changed the molecular environments of the functional groups of carboxylic acid on the ligands and their dissociability, leading to the gradual pH rise as the assembly proceeds. The raised pH value in turn disfavors the further growth of the assemblies by increasing their surface potential. When the pH increment is not significant, consumption of intermediate assemblies can result in the termination of the products. When the pH value increment is high enough, it can kinetically prevent further growth of the lamellae due to the high surface potential. Therefore, the work discloses a brand-new mechanism for the termination of the self-assembly and provides a strategy to realize self-terminated growth in artificial self-assembly systems.

show abstract

Controlling the size and surface morphology of carboxylated polystyrene latex particles by ammonium hydroxide in emulsifier-free polymerization

Cited by 12 publications

References 19 publications

Coulomb Force Directed Single and Binary Assembly of Nanoparticles from Aqueous Dispersions by AFM Nanoxerography

Coulomb Force Directed Single and Binary Assembly of Nanoparticles from Aqueous Dispersions by AFM Nanoxerography

Fluoropolymer Microemulsion: Preparation and Application in Reservoir Wettability Reversal and Enhancing Oil Recovery

Unraveling Self-Carried Chemical Feedback on Assembly Processes and the Self-Termination of Growth in Au(I)–Thiolate Lamellae

Contact Info

Product

Resources

About