Friction Properties of Poly(vinyl alcohol) Hydrogel: Effects of Degree of Polymerization and Saponification Value

Mamada, Keisuke; Fridrici, V.; Kosukegawa, Hiroyuki; Kapsa, Ph.; Ohta, Makoto

doi:10.1007/s11249-011-9768-8

Cited by 23 publications

(13 citation statements)

References 31 publications

(38 reference statements)

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“…Several previous reports have shown that the friction coefficient also increases as the velocity increases [10,[13][14]. However, the result of our force curve analysis showed that velocity had little effect on the force.…”

Section: Parameter Selectioncontrasting

confidence: 68%

Study of Parameters for Evaluating the Pushability of Interventional Devices Using Box-shaped Blood Vessel Biomodels Made of PVA-H or Silicone

Ohta

Kwon

2014

Bio-Medical Materials and Engineering

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In this paper, we investigated several parameters with effect on the compressive force to assess the mechanical properties of interventional device. We find several parameters are highly influential and others are not. In our evaluation system, we prepared a box-shaped PVA-H and silicone with realistic geometry and carried out the measurement and evaluation of the pushability by using load cell machine. The parameters of velocity, position of device in the system do not affect the compressive force, whereas the length of catheter from the tip to fixed point is one of the most influential parameters for the force. Several behaviors such as passing through the curve or slip and stop can be observed and defined using this system. The balance of the bending force and the pushing force may make the tip with behavior of slip and stop or passing thorough the curve. The investigation of the evaluation system confirmed that high reproducibility with short error bar is indicated. The observation with movie record is also an advantage of our system because the high transparency of materials with silicone and PVA-H can check the inside of artery.

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Section: Parameter Selectioncontrasting

confidence: 68%

Study of Parameters for Evaluating the Pushability of Interventional Devices Using Box-shaped Blood Vessel Biomodels Made of PVA-H or Silicone

Ohta

Kwon

2014

Bio-Medical Materials and Engineering

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“…Such lubrication and, possibly a hydrodynamic regime in which the sliding surfaces are completely separated by water, will almost certainly apply at sufficiently high sliding velocities. The data in figure 11 may be compared with those obtained with hydrogels for which a maximum in the friction is also observed at intermediate velocities [113]. This was believed to correspond to a boundary regime and an increase in the friction at greater velocities was considered to be the result of hydrodynamic lubrication.…”

Section: Rsifroyalsocietypublishingorg J R Soc Interface 10: 20120467mentioning

confidence: 88%

Finger pad friction and its role in grip and touch

Adams

Johnson

Lefèvre

et al. 2013

J. R. Soc. Interface.

224

201

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Many aspects of both grip function and tactile perception depend on complex frictional interactions occurring in the contact zone of the finger pad, which is the subject of the current review. While it is well established that friction plays a crucial role in grip function, its exact contribution for discriminatory touch involving the sliding of a finger pad is more elusive. For texture discrimination, it is clear that vibrotaction plays an important role in the discriminatory mechanisms. Among other factors, friction impacts the nature of the vibrations generated by the relative movement of the fingertip skin against a probed object. Friction also has a major influence on the perceived tactile pleasantness of a surface. The contact mechanics of a finger pad is governed by the fingerprint ridges and the sweat that is exuded from pores located on these ridges. Counterintuitively, the coefficient of friction can increase by an order of magnitude in a period of tens of seconds when in contact with an impermeably smooth surface, such as glass. In contrast, the value will decrease for a porous surface, such as paper. The increase in friction is attributed to an occlusion mechanism and can be described by first-order kinetics. Surprisingly, the sensitivity of the coefficient of friction to the normal load and sliding velocity is comparatively of second order, yet these dependencies provide the main basis of theoretical models which, to-date, largely ignore the time evolution of the frictional dynamics. One well-known effect on taction is the possibility of inducing stick -slip if the friction decreases with increasing sliding velocity. Moreover, the initial slip of a finger pad occurs by the propagation of an annulus of failure from the perimeter of the contact zone and this phenomenon could be important in tactile perception and grip function.

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“…In addition to having similar mechanical properties, PVA hydrogels have a high water content resulting in a low surface friction resistance and low interfacial energy with water or biological fluids [35], thus these materials canmimic human soft tissues. An important advantage of PVA is the possibility to plan/design its properties by suitable selection of the ratio of hydrogel components, for example by changing the PVA and/or crosslinking agent concentration [36][37][38]. In this study, based on the work of Watler et al [36], 10 wt% of PVA was chemically cross-linked using glutaraldehyde in the presence of magnesium chloride.…”

Section: Blood Vessel Analogue (Pva Hydrogel)mentioning

confidence: 99%

Friction behaviour of hydrophilic lubricious coatings for medical device applications

Niemczyk

Fray

Franklin

2015

Tribology International

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The friction behaviour of new chitosan derivative coatings obtained by chemical modification of chitosan with fatty acids (linoleic and dilinoleic acid) has been investigated in order to explore their potential as endovascular catheter coatings and to benchmark them against commercially available coatings used in endovascular catheter applications. An in vitro tribological system was developed that was intended to represent to a limited extent the in vivo tribological conditions of a typical endovascular catheterization procedure. Continuous reciprocating sliding tests were carried out with uncoated and coated polymer specimens. The results showed that all of the coatings tested decreased the coefficient of friction compared to the uncoated polymer. Compared to a neat chitosan coating, the chitosan derivative coatings showed a clear reduction in the coefficient of friction to levels similar to those of the commercially-available coatings. A comparison between the friction results and contact angle measurements carried out on the coatings indicated that a range of contact angle values exists for which the friction coefficient is at a minimum. The reason for this is unclear and further studies are required in order to confirm and investigate the trend, especially within the context of hydrophilic lubricious coating development.

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Friction Properties of Poly(vinyl alcohol) Hydrogel: Effects of Degree of Polymerization and Saponification Value

Cited by 23 publications

References 31 publications

Study of Parameters for Evaluating the Pushability of Interventional Devices Using Box-shaped Blood Vessel Biomodels Made of PVA-H or Silicone

Study of Parameters for Evaluating the Pushability of Interventional Devices Using Box-shaped Blood Vessel Biomodels Made of PVA-H or Silicone

Finger pad friction and its role in grip and touch

Friction behaviour of hydrophilic lubricious coatings for medical device applications

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