Modification of the air–water interface by a chitosan adsorption process. Effect on an amphiphilic polymer monolayer

2004 ◽  
Vol 53 (11) ◽  
pp. 1652-1657 ◽  
Author(s):  
Ligia Gargallo ◽  
Angel Leiva ◽  
Marcela Urzúa ◽  
Luz Alegría ◽  
Beatriz Miranda ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Amphiphilic Polymer ◽  
Water Interface ◽  
Air Water Interface

scholarly journals Adsorption Kinetics of a Cationic Surfactant Bearing a Two-Charged Head at the Air-Water Interface

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 95 ◽  
Author(s):  
Marcos Fernández Leyes ◽  
Santiago Gimenez Reyes ◽  
Ezequiel Cuenca ◽  
Jhon F. Sánchez Morales ◽  
Hernán Ritacco
Keyword(s):  
Cationic Surfactant ◽  
Adsorption Process ◽  
Surface Concentration ◽  
Interfacial Region ◽  
Water Interface ◽  
Surface Tension Data ◽  
Time Resolved ◽  
Initial Stage ◽  
Wilhelmy Plate ◽  
Air Water Interface

We studied the dynamics of adsorption at the air-water interface of a cationic surfactant bearing two charges, Gemini 12-2-12, at concentrations below and above the critical micelle concentration (cmc). We used maximum bubble pressure and Wilhelmy plate techniques in order to access all time scales in the adsorption process. We found that the adsorption dynamics are controlled by diffusion at the initial stage of the adsorption process (milliseconds) and it is kinetically controlled by an electrostatic barrier (minute) approaching the equilibrium surfactant surface concentration. Between these two extremes, we found several relaxation phenomena, all following exponential decays with characteristic times spanning from one to hundreds of seconds. By means of time-resolved surface potential measurements, we show that these processes involve charge redistribution within the interfacial region. The surface tension data are analyzed and interpreted in the framework of the free energy approach.

Interactions between plasma proteins and pulmonary surfactant: pulsating bubble studies

1989 ◽  
Vol 67 (6) ◽  
pp. 663-668 ◽  
Author(s):  
Kevin M. W. Keough ◽  
Caroline S. Parsons ◽  
Martin G. Tweeddale
Keyword(s):  
Surface Tension ◽  
Plasma Proteins ◽  
Pulmonary Surfactant ◽  
Distress Syndrome ◽  
Adsorption Process ◽  
Human Albumin ◽  
Water Interface ◽  
Dipalmitoyl Phosphatidylcholine ◽  
Air Water Interface ◽  
Surfactant Inhibition

The influence of human albumin, α-globulin, and fibrinogen on the actions of porcine pulmonary surfactant in a pulsating bubble surfactometer has been investigated. All three proteins detracted from the ability of the surfactant to adsorb to the air–water interface. The proteins also reduced the ability of surfactant to lower the opening pressures of bubbles cycling between different sizes in suspensions of surfactant. This was equivalent to restricting the ability of the surfactant to achieve low surface tension during compression of the surface. Of the three proteins, globulin competed most effectively with surfactant during the adsorption process, and albumin competed the least effectively. The proteins also may have interfered with the processes of surface refinement, which usually yields a monolayer enriched enough in dipalmitoyl phosphatidylcholine to achieve very low surface tension (very low opening pressures in the bubbles). Of the three proteins tested, albumin was least deleterious to surface refining whereas globulin and fibrinogen appeared to be about equally detrimental to the process.Key words: pulmonary surfactant, surface tension, adsorption, adult respiratory distress syndrome, surfactant inhibition.

Effect of Salt Concentration on the Nanostructure of Weak Polyacid Brush in the Amphiphilic Polymer Monolayer at the Air/Water Interface

Langmuir ◽  
2004 ◽  
Vol 20 (24) ◽  
pp. 10604-10611 ◽  
Author(s):  
Emiko Mouri ◽  
Ploysai Kaewsaiha ◽  
Kozo Matsumoto ◽  
Hideki Matsuoka ◽  
Naoya Torikai
Keyword(s):  
Salt Concentration ◽  
Amphiphilic Polymer ◽  
Water Interface ◽  
Air Water Interface

Probing the Bovine Hemoglobin Adsorption Process and its Influence on Interfacial Water Structure at the Air–Water Interface

2021 ◽  
pp. 000370282110351
Author(s):  
Shilpi Chaudhary ◽  
Harsharan Kaur ◽  
Harpreet Kaur ◽  
Bhawna Rana ◽  
Deepak Tomar ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Protein Denaturation ◽  
Water Structure ◽  
Water Molecules ◽  
Bovine Hemoglobin ◽  
Interfacial Water ◽  
Water Interface ◽  
Air Water Interface ◽  
Protein Molecules ◽  
Denaturation Process

* These authors contributed equally to this work. The molecular-level insight of protein adsorption and its kinetics at interfaces is crucial because of its multifold role in diverse fundamental biological processes and applications. In the present study, the sum frequency generation (SFG) vibrational spectroscopy has been employed to demonstrate the adsorption process of bovine hemoglobin (BHb) protein molecules at the air–water interface at interfacial isoelectric point of the protein. It has been observed that surface coverage of BHb molecules significantly influences the arrangement of the protein molecules at the interface. The time-dependent SFG studies at two different frequencies in the fingerprint region elucidate the kinetics of protein denaturation process and its influence on the hydrogen-bonding network of interfacial water molecules at the air–water interface. The initial growth kinetics suggests the synchronized behavior of protein adsorption process with the structural changes in the interfacial water molecules. Interestingly, both the events carry similar characteristic time constants. However, the conformational changes in the protein structure due to the denaturation process stay for a long time, whereas the changes in water structure reconcile quickly. It is revealed that the protein denaturation process is followed by the advent of strongly hydrogen-bonded water molecules at the interface. In addition, we have also carried out the surface tension kinetics measurements to complement the findings of our SFG spectroscopic results.

Hydrophilic Chain Length Dependence of the Ionic Amphiphilic Polymer Monolayer Structure at the Air/Water Interface

Langmuir ◽  
2004 ◽  
Vol 20 (19) ◽  
pp. 8062-8067 ◽  
Author(s):  
Emiko Mouri ◽  
Yasuyuki Furuya ◽  
Kozo Matsumoto ◽  
Hideki Matsuoka
Keyword(s):  
Chain Length ◽  
Amphiphilic Polymer ◽  
Water Interface ◽  
Length Dependence ◽  
Air Water Interface

Sampling and analysis of the air-water interface with SEM and EDS of microlayers

1989 ◽  
Vol 47 ◽  
pp. 1004-1005
Author(s):  
Randall W. Smith ◽  
John Dash
Keyword(s):  
Heavy Metals ◽  
Surface Microlayer ◽  
Surface Films ◽  
Water Interface ◽  
Physical Processes ◽  
Infrared Spectroscopic Analysis ◽  
Eds Analysis ◽  
Air Water Interface ◽  
Significant Area ◽  
Bulk Chemical

The structure of the air-water interface forms a boundary layer that involves biological ,chemical geological and physical processes in its formation. Freshwater and sea surface microlayers form at the air-water interface and include a diverse assemblage of organic matter, detritus, microorganisms, plankton and heavy metals. The sampling of microlayers and the examination of components is presently a significant area of study because of the input of anthropogenic materials and their accumulation at the air-water interface. The neustonic organisms present in this environment may be sensitive to the toxic components of these inputs. Hardy reports that over 20 different methods have been developed for sampling of microlayers, primarily for bulk chemical analysis. We report here the examination of microlayer films for the documentation of structure and composition.Baier and Gucinski reported the use of Langmuir-Blogett films obtained on germanium prisms for infrared spectroscopic analysis (IR-ATR) of components. The sampling of microlayers has been done by collecting fi1ms on glass plates and teflon drums, We found that microlayers could be collected on 11 mm glass cover slips by pulling a Langmuir-Blogett film from a surface microlayer. Comparative collections were made on methylcel1ulose filter pads. The films could be air-dried or preserved in Lugol's Iodine Several slicks or surface films were sampled in September, 1987 in Chesapeake Bay, Maryland and in August, 1988 in Sequim Bay, Washington, For glass coverslips the films were air-dried, mounted on SEM pegs, ringed with colloidal silver, and sputter coated with Au-Pd, The Langmuir-Blogett film technique maintained the structure of the microlayer intact for examination, SEM observation and EDS analysis were then used to determine organisms and relative concentrations of heavy metals, using a Link AN 10000 EDS system with an ISI SS40 SEM unit. Typical heavy microlayer films are shown in Figure 3.

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