Normal Forces between Cellulose Surfaces Measured with Colloidal Probe Microscopy

Zauscher, Stefan; Klingenberg, Daniel J.

doi:10.1006/jcis.2000.7008

Cited by 75 publications

(121 citation statements)

References 67 publications

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“…The force-distance profiles obtained in this study are generally consistent with AFM or SFA studies of the cellulose/cellulose interaction [4][5][6][7][8]. The influence of electrolyte concentration on the force-distance profiles signifies the importance of the electrostatic interactions for cellulose surfaces (Fig.…”

Section: Interaction Of the Surfaces Of Pure Cellulosesupporting

confidence: 85%

“…Dissociation of these groups is responsible for negative surface charge and, consequently, for repulsive interaction of the cellulose surfaces. It is generally agreed [5,7,8] that interactions between two cellulose surfaces at relatively large separation distances can be described using DVLO theory. However, for interactions between polymeric surfaces one must consider electrosteric forces that arise due to interactions of thermally mobile polymeric chains or segments that protrude from the surface into the medium.…”

Section: Interaction Of the Surfaces Of Pure Cellulosementioning

confidence: 99%

“…These techniques have been used to measure interactions of cellulose surfaces [4][5][6][7][8][9] aiming mostly to increase the insight into interfacial phenomena in traditional cellulose applications such as papermaking. With growing interest in new cellulose applications often involving biomolecules or even cells and tissues (drug delivery devices [10], affinity separation [11], tissue engineering [12]) surface force measurements are becoming important to advance understanding of interfacial phenomena in such complex multi-component systems based on cellulose polymers.…”

Section: Introductionmentioning

confidence: 99%

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Atomic force microscopy study of cellulose surface interaction controlled by cellulose binding domains

Nigmatullin

Lovitt

Wright

et al. 2004

Colloids and Surfaces B: Biointerfaces

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Colloidal probe microscopy has been used to study the interaction between model cellulose surfaces and the role of cellulose binding domain (CBD), peptides specifically binding to cellulose, in interfacial interaction of cellulose surfaces modified with CBDs.The interaction between pure cellulose surfaces in aqueous electrolyte solution is dominated by double layer repulsive forces with the range and magnitude of the net force dependent on electrolyte concentration. AFM imaging reveals agglomeration of CBD adsorbed on cellulose surface. Despite an increase in surface charge owing to CBD binding to cellulose surface, force profiles are less repulsive for interactions involving, at least, one modified surface. Such changes are attributed to irregularity of the topography of protein surface and non-uniform distribution of surface charges on the surface of modified cellulose.Binding double CBD hybrid protein to cellulose surfaces causes adhesive forces at retraction, whereas separation curves obtained with cellulose modified with single CBD show small adhesion only at high ionic strength. This is possibly caused by the formation of the cross-links between cellulose surfaces in the case of double CBD.

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Section: Interaction Of the Surfaces Of Pure Cellulosesupporting

confidence: 85%

Section: Interaction Of the Surfaces Of Pure Cellulosementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Atomic force microscopy study of cellulose surface interaction controlled by cellulose binding domains

Nigmatullin

Lovitt

Wright

et al. 2004

Colloids and Surfaces B: Biointerfaces

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show abstract

“…In contrast, the CS-GAG polyelectrolyte chains in our study were chemically end-grafted to the surface. Adsorbing polymer layers exhibit significant degrees of hysteresis, 69,74 while the interaction of the CS-GAGs with the underlying substrate is shown here to be minimal as evidenced by the nonhysteric, reversible overlap of approach and retraction curves (Figure 6b). The magnitude of the force was consistent at three different locations and the standard deviation of the experiment at each ionic strength was less than 20 pN, which indicated the uniformity of the CS-GAG end-grafted substrate.…”

Section: Interaction Between Sulfate-functionalized Probe Tip and Cs-mentioning

confidence: 88%

Direct Measurement of Glycosaminoglycan Intermolecular Interactions via High-Resolution Force Spectroscopy

et al. 2002

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Intermolecular repulsion forces between negatively charged glycosaminoglycan (CS-GAG) macromolecules are a major determinant of cartilage biomechanical properties. It is thought that the electrostatic component of the total intermolecular interaction is responsible for 50-75% of the equilibrium elastic modulus of cartilage in compression, while other forces (e.g., steric, hydration, van der Waals, etc.) may also play a role. To investigate these forces, radiolabeled CS-GAG polymer chains, with a fully extended contour length of 35 nm, were chemically end-grafted to a planar surface to form model biomimetic polyelectrolyte "brush" layers whose environment (e.g., ionic strength, pH) was varied to mimic physiological conditions. The total intersurface force (enN) between the CS-GAG brushes and chemically modified probe tips (SO 3 -and OH) was measured as a function of tip-substrate separation distance in aqueous solution using the technique of high-resolution force spectroscopy (HRFS). These experiments showed long-range, nonlinear, purely repulsive forces that decreased in magnitude and range with increasing ionic strength and decreasing pH. To estimate the contribution of the electrostatic component to the total intersurface force, the data were compared to a theoretical model of electrical double layer repulsion based on the Poisson-Boltzmann formulation. The CS-GAG brush layer was approximated as either a flat surface charge density or a smoothed volume of known fixed charge density and the probe tip was modeled as a smooth hemisphere of constant surface charge density. Modeling the CS-GAG brush as a volume charge yielded theoretical fits much closer to the experimental data and is a good first step toward deconvolution of the force components.

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“…In contrast to many commercial polymer particles these microspheres are not cross-linked. Cellulose is another material which is commercially available from different sources and has been studied by several groups [183][184][185][186].…”

Section: Colloidal Probesmentioning

confidence: 99%

Force measurements with the atomic force microscope: Technique, interpretation and applications

Butt

Cappella

Kappl

2005

Surface Science Reports

3,246

2,949

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Normal Forces between Cellulose Surfaces Measured with Colloidal Probe Microscopy

Cited by 75 publications

References 67 publications

Atomic force microscopy study of cellulose surface interaction controlled by cellulose binding domains

Atomic force microscopy study of cellulose surface interaction controlled by cellulose binding domains

Direct Measurement of Glycosaminoglycan Intermolecular Interactions via High-Resolution Force Spectroscopy

Force measurements with the atomic force microscope: Technique, interpretation and applications

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