Barite scale formation and dissolution at high ionic strength studied with atomic force microscopy

2001 ◽  
Vol 191 (3) ◽  
pp. 201-214 ◽  
Author(s):  
Peter Risthaus ◽  
Dirk Bosbach ◽  
Udo Becker ◽  
Andrew Putnis
Keyword(s):  
Atomic Force Microscopy ◽  
Ionic Strength ◽  
Scale Formation ◽  
High Ionic Strength ◽  
Force Microscopy ◽  
Atomic Force

Atomic Force Microscopy of Humic Substances:  Effects of pH and Ionic Strength

1999 ◽  
Vol 33 (21) ◽  
pp. 3911-3917 ◽  
Author(s):  
Eric Balnois ◽  
Kevin J. Wilkinson ◽  
Jamie R. Lead ◽  
Jacques Buffle
Keyword(s):  
Atomic Force Microscopy ◽  
Ionic Strength ◽  
Humic Substances ◽  
Force Microscopy ◽  
Atomic Force ◽  
Effects Of Ph

scholarly journals Atomic force microscopy of gastric mucin and chitosan mucoadhesive systems

2000 ◽  
Vol 348 (3) ◽  
pp. 557-563 ◽  
Author(s):  
Matthew P. DEACON ◽  
Simon McGURK ◽  
Clive J. ROBERTS ◽  
Phillip M. WILLIAMS ◽  
Saul J. B. TENDLER ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Atomic Force Microscopy ◽  
Ionic Strength ◽  
Average Length ◽  
Gastric Mucin ◽  
Acetate Buffer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Molecular Hydrodynamic ◽  
Hydrodynamic Data

Atomic force microscopy has been utilized to probe, at a molecular level, the interaction between purified pig gastric mucin (PGM) and a mucoadhesive cationic polymer, chitosan (sea cure 210+), with a low degree (approx. 11%) of acetylation. Images were produced detailing the structures of both PGM and chitosan in 0.1 M acetate buffer (pH 4.5), followed by the complex of the two structures in the same buffer. PGM in 0.1 M acetate buffer revealed long linear filamentous structures, consistent with earlier electron microscopy and scanning tunnelling micoscopy studies. The chitosan molecules also adopted a linear conformation in the same buffer, although with a smaller average length and diameter. They appeared to adopt a stiff-coil conformation consistent with earlier hydrodynamic measurements. The complexes formed after mixing PGM and chitosan together revealed large aggregates. In 0.1 M ionic strength buffer they were of the order of 0.7 μm in diameter, consistent with previous electron microscopy studies. The effect of ionic strength of the buffer on the structure of the complex was also studied and, together with molecular hydrodynamic data, demonstrates that the interaction is principally electrostatic in nature.

scholarly journals Colored Surfaces Made of Synthetic Eumelanin

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2320
Author(s):  
Gema Marcelo ◽  
María del Mar López-González ◽  
Milena Vega ◽  
Carlos Pecharromán
Keyword(s):  
Refractive Index ◽  
Ionic Strength ◽  
Chemical Structure ◽  
Visible Spectral Region ◽  
High Ionic Strength ◽  
Force Microscopy ◽  
Atomic Force ◽  
Visible Wavelength Range ◽  
Dopamine Hydrochloride ◽  
Scanning Electron

The polymerization of 3,4-dihydroxy-L-phenylalanine leads to a carboxylic acid-rich synthetic melanin-like material (poly-L-DOPA). Synthetic melanin most resembles natural eumelanin in chemical structure. However, its deposition on surfaces leading to colored surfaces by interference is not as easy to accomplish as in the case of the preparation of colored surfaces by dopamine hydrochloride polymerization. This study deals with the preparation of new colored surfaces made from poly-L-DOPA displaying vivid colors by interference. These surfaces were obtained by depositing thin films of poly-L-DOPA on a reflective silicon nitride substrate. A high ionic strength in the polymerization medium was essential to accomplish the coating. The effect of ionic strength on the resulting surfaces was studied via reflectance, Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM). The refractive index was determined by ellipsometry, and was nearly constant to 1.8 when λ > 650 nm. In the visible spectral region, the imaginary part of the refractive index becomes relevant. The refractive index in the visible wavelength range (400–600 nm) was in the range 1.7–1.80.

Dependence of Purple Membrane Bump Curvature on pH and Ionic Strength Analyzed Using Atomic Force Microscopy Combined with Solvent Exchange

2014 ◽  
Vol 118 (31) ◽  
pp. 9322-9328 ◽  
Author(s):  
Yasunori Yokoyama ◽  
Kosuke Yamada ◽  
Yosuke Higashi ◽  
Satoshi Ozaki ◽  
Haorang Wang ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Ionic Strength ◽  
Purple Membrane ◽  
Solvent Exchange ◽  
Force Microscopy ◽  
Atomic Force

scholarly journals 2P107 Curvature of Bump Structures on Purple Membrane Depending on pH and Ionic Strength Analyzed by Atomic Force Microscopy(03. Membrane proteins,Poster)

2013 ◽  
Vol 53 (supplement1-2) ◽  
pp. S176
Author(s):  
Yasunori Yokoyama ◽  
Kosuke Yamada ◽  
Yosuke Higashi ◽  
Satoshi Ozaki ◽  
Haorang Wang ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Ionic Strength ◽  
Membrane Proteins ◽  
Purple Membrane ◽  
Force Microscopy ◽  
Atomic Force
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