Applied Adhesion Science最新文献

{"title":"Experimental investigation of the effect of tip shape in gecko-inspired adhesive devices under asymmetric detachment","authors":"Yu Sekiguchi,&nbsp;Chiaki Sato","doi":"10.1186/s40563-017-0086-8","DOIUrl":"https://doi.org/10.1186/s40563-017-0086-8","url":null,"abstract":"<p>Gecko’s foot hairs exhibit significant frictional anisotropy that enables a strong foot grip in a specific direction and an easy detachment in the opposite direction. In this study, we fabricate adhesive devices with frictional anisotropy mimicking gecko’s foot hair based on oblique micro-beam arrays. The devices adhesion force is strongly anisotropic along the beam tilting direction and depends on the stress distribution at the contact area which, in turn, is affected by the geometry of the beam tips. This dependence is investigated by fabricating and testing micro beam arrays with various tip shapes.</p>","PeriodicalId":464,"journal":{"name":"Applied Adhesion Science","volume":"5 1","pages":""},"PeriodicalIF":1.68,"publicationDate":"2017-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40563-017-0086-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4389326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental investigation of mode I fracture energy of adhesively bonded joints under impact loading conditions","authors":"Yuki Yamagata,&nbsp;Xi Lu,&nbsp;Yu Sekiguchi,&nbsp;Chiaki Sato","doi":"10.1186/s40563-017-0087-7","DOIUrl":"https://doi.org/10.1186/s40563-017-0087-7","url":null,"abstract":"<p>Double cantilever beam (DCB) tests under impact loading conditions were conducted using a falling-wedge impact test machine and a high-speed camera. The change in mode I fracture energy <i>G</i>\u0000 _IC was investigated in comparison with the results obtained under the quasi-static loading condition. Two types of adhesives with significantly different mechanical properties were used for the DCB tests, and the change in rate dependency of the adhesive types was observed. Adhesively bonded joints have been widely used in various engineering products, such as automobiles, ships and airplanes. The strength of the joints is important for product safety. To evaluate the mode I fracture energy of adhesively bonded joints, DCB tests have been standardized under the quasi-static loading condition. Additionally, several tests have been proposed to evaluate the impact resistance of the joints. However, impact loading makes it difficult to evaluate the fracture energy accurately because of the dynamic effects. Therefore, specialized evaluation methods for dynamic fracture must be considered, and a load-independent analysis of the fracture energy was used to avoid load measurement problems due to the dynamic effects in this study.</p>","PeriodicalId":464,"journal":{"name":"Applied Adhesion Science","volume":"5 1","pages":""},"PeriodicalIF":1.68,"publicationDate":"2017-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40563-017-0087-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5078596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of adhesion between microspheres and rubber surfaces accompanied by meniscus formation and sedimentation","authors":"Shoko Mishima,&nbsp;Hiroaki Iikura,&nbsp;Toshiaki Ougizawa","doi":"10.1186/s40563-017-0084-x","DOIUrl":"https://doi.org/10.1186/s40563-017-0084-x","url":null,"abstract":"<p>This paper reports on the adhesion characteristics between microspheres and rubber surfaces. Silica, polystyrene, and poly(methyl methacrylate) microspheres were deposited on <i>cis</i>-1,4-polybutadiene (BR) films. A BR meniscus formed on the sphere surfaces when the film thickness was less than the diameters of the spheres. Additionally, the attractive forces acting on the spheres in the direction of the BR films were examined via atomic force microscopy. Sedimentation of the spheres occurred for films with thicknesses much greater than the diameters of the microspheres in all systems. Interestingly, this wetting process occurred even in the silica/BR system, despite the incompatibility of these materials. The driving force for meniscus formation is the difference between the surface free energy of BR (<i>γ</i>\u0000 _BR) and that of the spheres (<i>γ</i>\u0000 _sphere). For all systems, <i>γ</i>\u0000 _BR is lower than <i>γ</i>\u0000 _sphere, i.e., the BR surface is more stable than those of the spheres, and thus a meniscus forms to stabilize the system. Once a meniscus formed, a downward force acted on the spheres to embed them into the BR film. Sedimentation eventually ceased when the angle between the tangential line of the sphere and the rubber surface became equal to the equilibrium contact angle determined by Young’s equation. Interestingly, the sedimentation behavior was nearly identical for spheres with various surface free energy values except in terms of their final positions. The same sedimentation phenomena were studied with crosslinked BR films. In contrast to the experiments performed using various types of spheres, the sedimentation behavior varied with different rubber characteristics. The results of these studies indicate that the sedimentation behavior mainly depends on the physical properties of the rubbers used, although the physical properties of the spheres are in determining their final depth.</p>","PeriodicalId":464,"journal":{"name":"Applied Adhesion Science","volume":"5 1","pages":""},"PeriodicalIF":1.68,"publicationDate":"2017-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40563-017-0084-x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4244815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Control of adhesive strength of acrylate polymers containing 1-isobutoxyethyl and isobornyl esters in response to dual stimuli for dismantlable adhesion","authors":"Yusuke Fukamoto,&nbsp;Eriko Sato,&nbsp;Haruyuki Okamura,&nbsp;Hideo Horibe,&nbsp;Akikazu Matsumoto","doi":"10.1186/s40563-017-0085-9","DOIUrl":"https://doi.org/10.1186/s40563-017-0085-9","url":null,"abstract":"<p>To develop an adhesion system satisfying both constant adhesion strength during use and quick debonding ability during a dismantling process.</p><p>Adhesive properties were investigated for the random and block copolymers consisting of 1-isobutoxyethyl acrylate (iBEA), 2-ethylhexyl acrylate (2EHA), and 2-hydroxyethyl acrylate (HEA) as the dismantlable pressure-sensitive adhesives in the presence of a photoacid generator in response to dual external stimuli of photoirradiation and post baking.</p><p>The use of LED combined with a new photoacid generator SIN-11 was enable us to achieve a rapid dismantling process during UV irradiation within several minutes. The protection of the ester alkyl group in the iBEA repeating unit to give an acrylic acid unit was suppressed by the introduction of isobornyl acrylate (IBoA) as the additional unit into the copolymer of iBEA, 2EHA, and HEA. While IBoA‐containing block copolymer showed a constant adhesive strength during photoirradiation as the single external stimulus, deprotection was immediately induced by the subsequent heating, leading to a significant decrease in the adhesive strength.</p><p>The copolymer including the iBEA and IBoA units was revealed to function as the highly sensitive adhesive materials for dual-locked dismantlable adhesion.</p>","PeriodicalId":464,"journal":{"name":"Applied Adhesion Science","volume":"5 1","pages":""},"PeriodicalIF":1.68,"publicationDate":"2017-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40563-017-0085-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4248173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of energy dissipation involving adhesion hysteresis in spherical contact between a glass lens and a PDMS block","authors":"Dooyoung Baek,&nbsp;Pasomphone Hemthavy,&nbsp;Shigeki Saito,&nbsp;Kunio Takahashi","doi":"10.1186/s40563-017-0082-z","DOIUrl":"https://doi.org/10.1186/s40563-017-0082-z","url":null,"abstract":"<p>Adhesion hysteresis was investigated with the energy dissipation in the contact experiments between a spherical glass lens and a polydimethylsiloxane (PDMS) block. The experiments were conducted under step-by-step loading–unloading for the spontaneous energy dissipation. The force, contact radius, and displacement were measured simultaneously and the elasticity of the PDMS was confirmed. The work of adhesion was estimated in the loading process of the strain energy release rate. The total energy dissipation has been observed to be linearly proportional to the contact radius in the unloading process. The approximately constant gradient of the energy dissipation for each unloading process has been found. The result would provide how the dissipation is induced during the unloading as some interfacial phenomena. The fact has been discussed with some interfacial phenomena, e.g., the adsorbates on the surface, for the mechanism of adhesion hysteresis.</p>","PeriodicalId":464,"journal":{"name":"Applied Adhesion Science","volume":"5 1","pages":""},"PeriodicalIF":1.68,"publicationDate":"2017-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40563-017-0082-z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4115701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of mixed micro and nano silica particles on the dynamic compressive performances of epoxy adhesive","authors":"Yohanes,&nbsp;Yasuhisa Sekiguchi","doi":"10.1186/s40563-017-0083-y","DOIUrl":"https://doi.org/10.1186/s40563-017-0083-y","url":null,"abstract":"<p>Effects of mixed micro and nano silica particles on the dynamic stiffness, stress transmissibility, and energy absorption of the epoxy composite were investigated using the split Hopkinson pressure bars. It was found that the dynamic stiffness significantly increased with silica weight fraction regardless of its sizes and composition ratio. However, the effect became less significant as the temperature approached <i>T</i>\u0000 _{\u0000 <i>g</i>\u0000}. It was also found that mixed micro and nano silica particles decreased both the epoxy dynamic stiffness and the stress transmissibility, and increased the energy absorption. The optimum composition ratio was found to maximize the energy absorption while maintaining high stiffness performance of epoxy. The results obtained in the present work can be used to design the performance of epoxy/silica adhesive for appropriate applications.</p>","PeriodicalId":464,"journal":{"name":"Applied Adhesion Science","volume":"5 1","pages":""},"PeriodicalIF":1.68,"publicationDate":"2017-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40563-017-0083-y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4078255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Editorial TS: Papers from the 3rd Luso-Brazilian Conference on Adhesion and Adhesives (CLBA2016), Rio de Janeiro, Brazil, 25–27 January 2016","authors":"L. F. Silva, S. Barros","doi":"10.1080/00218464.2016.1188342","DOIUrl":"https://doi.org/10.1080/00218464.2016.1188342","url":null,"abstract":"This special issue of Applied Adhesion Science (AAS) contains selected papers presented at the 3rd Luso-Brazilian Conference on Adhesion and Adhesives (CLBA 2016) held in Rio de Janeiro, Brazil, during January 25–27, 2016. CLBA 2016 was chaired by both of us and was co-organized by the Brazilian Association of Adhesion and Adhesives (ABAA) and the Portuguese Association of Adhesion and Adhesives (APAA). The goal of the conference was to join the Portuguese and Brazilian communities to discuss issues related to adhesive bonding research lately developed in both countries. Approximately 60 papers were presented by researchers from many universities and research centers. In order to disseminate the work presented at CLBA 2016, selected papers were prepared which resulted in the present Special Issue. Four papers deal with adhesive dentistry aspects. They were presented by colleagues from the Brazilian dental materials community. Lopes et al. evaluated the influence of the previous use of eugenol based materials to a permanent restoration on the marginal microleakage. They also investigated the influence of mechanical cleansing associated with chemical cleansing with chlorhexidine gel. It was found that eugenol, when associated with endodontic or temporary restorative material, has no influence on the microleakage of the definitive composite resin restoration. The study presented by Da Silva et al. evaluated the shear bond strength of three different composite resins to fiber posts surfaces. The influence the adhesive used as pretreatment was also investigated. The authors concluded that the use of silorane based composite resins to customize posts requires the use of adhesive as surface pretreatment. Schwertner et al. evaluated the effect of green tea on the shear bond strength of metal orthodontic brackets to human enamel after home whitening treatment. They concluded that green tea is an alternative treatment to allow bracket bonding immediately after home whitening treatment. Another study on the shear bond strength of brackets to enamel was presented by Guiraldo et al. The objective of the study was to evaluate the enamel roughness and shear bond strength of dental composite after removal of metal brackets bonded with different adhesives. The shear bond test results shown that the 4 adhesives produced adequate bond strength, however the enamel did not return to the initial conditions. Open Access","PeriodicalId":464,"journal":{"name":"Applied Adhesion Science","volume":"5 1","pages":"1-2"},"PeriodicalIF":1.68,"publicationDate":"2017-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00218464.2016.1188342","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46341704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coumarin-based iodonium hexafluoroantimonate as an alternative photoinitiator for experimental dental adhesives resin","authors":"Peterson Oliveira Boeira,&nbsp;Carine Tais Welter Meereis,&nbsp;Carlos Enrique Cuevas Suárez,&nbsp;Suzanne Mendes de Almeida,&nbsp;Evandro Piva,&nbsp;Giana da Silveira Lima","doi":"10.1186/s40563-016-0080-6","DOIUrl":"https://doi.org/10.1186/s40563-016-0080-6","url":null,"abstract":"<p>The objective of this study was to evaluate the coumarin-based iodonium hexafluoroantimonate (P3C-Sb) in the polymerization kinetics of an experimental model adhesive resin both in presence of solvent and acid monomer content. A monomer mixture based on Bis-GMA, TEGDMA and HEMA was used as a model adhesive resin. Initially a screening was performed to evaluate P3C-Sb concentrations (0.25, 0.50, 1, 2, 4?mol%). Four photoinitiator systems using P3C-Sb at 2?mol% were evaluated: CQ?+?EDAB (control), P3C-Sb?+?CQ, P3C-Sb?+?EDAB and P3C-Sb?+?EDAB?+?CQ. Additionally, the performance of the photoinitiator systems in the presence of ethanol and acidic monomer at four different concentrations (0, 10, 20, 40 wt%) were evaluated. Real-time Fourier transform infrared spectroscopy was used to evaluate degree of conversion (DC) and rate of polymerization (RP). The ternary initiation system P3C-Sb?+?CQ?+?EDAB showed similar DC and RP to CQ?+?EDAB into the model adhesive resin without ethanol, however, in the presence of solvent, P3C-Sb?+?CQ?+?EDAB showed the highest polymerization kinetics. An inhibitory polymerization effect was observed when a solvent was introduced to adhesive resin using CQ?+?EDAB. Polymerization reaction was affected by the presence of acidic monomer irrespective of initiation system used. Adhesive resins with CQ?+?EDAB and P3C-Sb?+?CQ?+?EDAB as initiation systems showed similar DC to CQ?+?EDAB in presence of acidic monomer. The use of P3C-Sb as a third component of the initiation system seems to be an interesting alternative to improve the polymerization kinetics of simplified dental adhesives which showed to be less sensitive to the residual presence of solvent before photoactivation and it was similar polymerization behavior to CQ?+?EDAB in presence of acidic monomer.</p>","PeriodicalId":464,"journal":{"name":"Applied Adhesion Science","volume":"5 1","pages":""},"PeriodicalIF":1.68,"publicationDate":"2017-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40563-016-0080-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4533002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of aging methods on push-out bond strength of adhesive systems to dentin cavities","authors":"Letícia Virgínia de Freitas Chaves,&nbsp;Tuany Arantxa de Medeiros,&nbsp;Boniek Castillo Dutra Borges,&nbsp;Maria do Carmo Aguiar Jordão Mainardi,&nbsp;Anderson Catelan,&nbsp;Flávio Henrique Baggio Aguiar","doi":"10.1186/s40563-016-0079-z","DOIUrl":"https://doi.org/10.1186/s40563-016-0079-z","url":null,"abstract":"<p>This study evaluated the effect of aging methods on the bond strength of etch-and-rinse adhesive systems to dentin cavities. Eighty bovine incisors were used to prepare dentin cavities, which were bonded with different adhesive systems [Adper Scotchbond Multipurpose (SBMP), and Adper Single Bond 2 (SB)], and restored with composite resin. The specimens were stored in water for 24?h, and subjected to each aging method (n?=?10): control group (not exposed to additional aging), thermal cycling (TC) (10,000 cycles; at temperatures of 5, 37, and 55?°C), mechanical loading (ML) (100,000 cycles; Hz; 60?N load), and TC?+?ML. The push-out bond strength test was performed using a universal testing machine. Failure modes were evaluated by scanning electron microscopy. Data were analyzed by two-way ANOVA and Tukey’s test (α?=?0.05). For SBMP, only TC?+?ML decreased the bond strength compared to control group. For SB, all aging methods decreased similarly the bond strength compared to control group. A high number of adhesive failures were observed. Therefore, SB was sensitive to all aging methods, whilst only TC?+?ML was able to decrease the bond strength for SBMP.</p>","PeriodicalId":464,"journal":{"name":"Applied Adhesion Science","volume":"5 1","pages":""},"PeriodicalIF":1.68,"publicationDate":"2017-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40563-016-0079-z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4465182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of oxidation and surface roughness on the shear strength of single-lap-joint adhesively bonded metal specimens by tension loading","authors":"M. H. Khan,&nbsp;O. A. Gali,&nbsp;A. Edrisy,&nbsp;A. R. Riahi","doi":"10.1186/s40563-016-0077-1","DOIUrl":"https://doi.org/10.1186/s40563-016-0077-1","url":null,"abstract":"<p>An experimental investigation was performed to study the effect of surface roughness and oxidation on the shear strength of single-lap-joints of AA6061, AA7075 aluminum alloys and an?AISI 1080 steel?alloy bonded with two different epoxy adhesives. An optimum surface roughness that provided the maximum shear strength was obtained for all the alloys at room temperature. The variation of the shear stress due to the different heat treatment temperatures revealed that the oxides developed on the alloy surfaces adversely affected the adhesive shear strength. The bulk concentration of magnesium of the aluminum alloys were also observed to affect the adhesive shear strength of the joints.</p>","PeriodicalId":464,"journal":{"name":"Applied Adhesion Science","volume":"4 1","pages":""},"PeriodicalIF":1.68,"publicationDate":"2016-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40563-016-0077-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4485361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}