Surface Force Studies of Langmuir–Blodgett Cellulose Films

Application of the JKR Method to the Measurement of Adhesion to Langmuir–Blodgett Cellulose Surfaces

“…This latter value is similar to that found between two cellulose surfaces in air employing the SFA. The values obtained with that technique is 105-210 mJ/m 2 [7]. A similar large hysteresis was observed when the adhesion between a glass slide and a PDMS cap was studied ( figure 7).…”

“…One reason is simply that interpenetration of the two materials into each other may occur. This has been observed to affect the adhesion between two cellulose surfaces [7], and between a PDMS cap and a silica surface carrying grafted PDMS chains [19]. This is likely the main reason for the hysteresis observed between one cellulose coated surface and one PDMS cap.…”

“…Chloroform was obtained from Merck and further purified by distillation in all glass apparatus. Trimethylsilyl cellulose (TMSC) was synthesized in our laboratory according to a method described elsewhere [7,15]. 10.3 mg of TMSC was dissolved in a mixture of 95% chloroform and 5% absolute ethanol and the solution was stored at 5°C prior to use.…”

“…Cellulose surfaces were prepared as described by Holmberg et al [7]. First the substrate surface, a freshly cleaved piece of muscovite mica 3 cm long and 1 cm wide, was rendered hydrophobic by Langmuir-Blodgett deposition.…”

“…The adhesion between paper and other materials are also of great importance; inorganic fillers are commonly used in paper, ink has to adhere during the printing process (and be removed during deinking), and paper and other materials are used together in composites such as packing materials for food. For these reasons interactions forces acting between cellulose surfaces and between cellulose and other materials have been studied extensively during the last years using a range of surface force methods such as atomic force colloidal probe [2][3][4], MASIF [5] and the interferometic surface force apparatus, SFA [6][7][8]. These techniques are all very powerful and they provide information of long-range and adhesive properties between surfaces.…”