On homogeneous, smooth surfaces, the distribution of adhesion forces measured with nanocontacts can be as narrow as 1. 1%. Adhesion force versus humidity curves measured between hydrophilic surfaces can be interpreted by assuming capillary condensation of water into the contact region, which causes a meniscus force. The often observed changes in these dependencies when repeating experiments are interpreted as changes in tip geometry in the 1-10 nm length scale caused by tip wear. No intrinsic statistical process is required to explain it. The slower fluctuations are probably caused by plastic deformation and structural changes in the material at the nanocontact. As a possible simple model, we introduce the two-sphere model with surface roughness. Random noise is due to thermal vibrations and noise in the detection system. All types of dependencies observed can be explained by appropriate and realistic tip shapes. For adhesion forces measured between identical contacts, two kinds of variations were observed: a fast, random noise and slower fluctuations.
On the Adhesion between Fine Particles and Nanocontacts. An Atomic Force Microscope Study
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Книга по Требованию
Немаловажным фактором при применении композитов является толщина слоя дентинного адгезива – толщина образовавшегося слоя. Состав и методика применения некоторых дентиновых адгезивов: Дентиновый адгезив (фирма) Состав Применение A.R. . Bo d 1,6% малеиновая кислота Соотношение 1:1, (Col e e) 99% НЕМА аппликация в Primer A 0,3% течение 60-90 сек и Primer B полиметакрилолиго-малеинов высушивание в ая кислота течение 20 сек 1% окись алюминия 1.слой 20 сек и 49% EGDMA выдувание 44% Bis-GMA 2.слой: Bo d 7% полимеризация 20 полиметакрилолиго-малеинов сек. ая кислота De hesive (Kulzer) 5% ED A 40 сек Clea er метакрилойлооксиэтил-фосфа пропитывается, De hesive A т промывается и моно-метакрилойлокси-этилл высушивается, De hesive B -эфир малеиновой кислоты соотношение 1:1, 10 Adhesive Bo d 41% двуокись кремния сек впитывается, 15 31% UEDMA сек раздувается и 27% EGDMA полимеризуется 20 сек Gluma (Bayer De al) 0,5% M ED A 30 сек втирается, 35% НЕМА промывается, Clea ser 5% глутаральдегид дериваты высушивается Primer диметакрилата 10 сек пропитывается, Sealer раздувать и 20 сек пол.
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