The role of acid–base effects on particle charging in apolar media

Gacek, Matthew; Berg, John C.

doi:10.1016/j.cis.2015.03.004

Cited by 42 publications

(78 citation statements)

References 92 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, colloidal particles acquire electrical charge on their surfaces depending on the type and concentration of surfactant additives. It is still unsure if the surface charges of these colloidal particles are the result of the dissociation of a surface ion or the adhesion of a charged micelle, nor is it fully understood which factor determines the amount and polarization [27][28][29]. Tests of substrates covered with other dielectrics show different switching behaviors and different threshold voltages, suggesting that the surface material plays an important role.…”

Section: A Surface Chargementioning

confidence: 99%

Electrodynamics of Electronic Paper Based on Total Internal Reflection

et al. 2018

View full text Add to dashboard Cite

We present a study of the fundamental electrodynamics of an electronic ink pixel based on frustrated total internal reflection, which is relevant for the ongoing development of video-speed-capable electronic ink displays. Devices are fabricated with plane-parallel electrodes covered with a dielectric coating of the poly(p-xylylene) polymer Parylene C and filled with ink proprietary fluorochemical fluid containing absorbing particles. Reflectivity measurements of frustrated total internal reflection and transient current measurements provide information on the concentration of particles near the electrodes, conductivity of the ink, and screening of the electric field. By comparing the measurements with an electro-optical model, it is found that the electrical properties of the ink are dominated by positively charged particles and negative countercharges. Screening of the electric field depends as expected on the dielectric coating thickness. The observation of an asymmetry in the steady-state gray level response to an applied voltage is explained by fixed positive charges adsorbed at the interface between the dielectric coating and the dispersion. The overall switching dynamics of the device for different voltage sequences is in good agreement with simulations.

show abstract

Section: A Surface Chargementioning

confidence: 99%

Electrodynamics of Electronic Paper Based on Total Internal Reflection

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Dispersions of colloids in nonpolar solvents are prevalent in soft matter nanoscience [1][2][3][4][5][6][7][8][9][10][11][12]. The significance of such dispersions can be appreciated by considering the many various industrial sectors that make use of them, which include petrochemicals [13], lubricants [7,14,15], reprography [4,5], inkjet printing [5], magnetic recording media [4], rheological fluids [16,17], and electronic displays [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

The internal structure of poly(methyl methacrylate) latexes in nonpolar solvents

Smith

Finlayson

Gillespie

et al. 2016

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…These values are high enough to enable strong repulsion between the particles and give rise to a stable dispersion. The appearance of charges at the particles surfaces probably arises from the specific adsorption of hydroxide ions through dipolar or hydrogen bonding interaction with the atoms of hydrogen of the highly ordered interfacial water (Gacek and Berg, 2015). In water, the dispersion based on P3HT only (A ′′ ) is found to be stable and the average hydrodynamic diameter considerably decreases compared to A ′ ( Table 1).…”

Section: Second Solvent Displacement With Water: Generation Of the Shellmentioning

confidence: 99%

Elaboration of PCBM Coated P3HT Nanoparticles: Understanding the Shell Formation

et al. 2019

View full text Add to dashboard Cite

Solvent displacement, or nanoprecipitation, is a well-known process to develop colloidal dispersions in water. Using two successive and selective nanoprecipitation steps, we developed a method to generate [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) shell on poly(3-hexylthiophene) (P3HT) core nanoparticles (P3HT@PCBM). We report herein on the understanding of the shell formation during this process. Using several techniques (dynamic light scattering, zeta-potential, photoluminescence), we evidenced that after the first solvent displacement with dimethyl sulfoxide (DMSO), the PCBM molecules still dissolved in the medium are already in close interaction with the P3HT nanoparticles (NP). Such proximity of the P3HT core with PCBM molecules in the DMSO dispersion explains why PCBM aggregates around the nanoparticles during the second solvent displacement with water. A fast electron transfer from P3HT to PCBM was identified by transient absorption spectroscopy, confirming the core-shell morphology even for low PCBM concentration. This study opens the route for the development of well-defined nano-objects dispersed in water for fabrication of organic photovoltaic devices with eco-friendly processes.

show abstract

The role of acid–base effects on particle charging in apolar media

Cited by 42 publications

References 92 publications

Electrodynamics of Electronic Paper Based on Total Internal Reflection

Electrodynamics of Electronic Paper Based on Total Internal Reflection

The internal structure of poly(methyl methacrylate) latexes in nonpolar solvents

Elaboration of PCBM Coated P3HT Nanoparticles: Understanding the Shell Formation

Contact Info

Product

Resources

About