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Principles of Adhesive Rheology
Published in Nicholas P. Cheremisinoff, Elastomer Technology Handbook, 2020
Pressure-sensitive adhesives exhibit tack upon contact under pressure. Typically, a pressure-sensitive adhesive is used in combination with a flexible adherend. The combination of the two is often called a pressure-sensitive adhesive tape. Tape is applied by contacting its adhesive side, under slight pressure to the surface of a substrate. Tack that develops between tape and substrate can be understood in terms of two properties: (1) The tape establishes bonding with the substrate, and (2) the tape resists separation from the substrate. A typical example of a pressure-sensitive tape is commercial bandages.
Proof of Specific Radio Tomography Methods
Published in Blaunstein Nathan, Yakubov Vladimir, Electromagnetic and Acoustic Wave Tomography, 2018
Vladimir Yakubov, Sergey Shipilov, Dmitry Sukhanov, Andrey Klokov
Layer-to-layer transfer is performed interactively with the scrollbar: slide up for near layers, slide down for far layers. The depth of each layer (in meters) is displayed underneath. There was just one non-linear inhomogeneity in the given example (a microwave diode). Other inhomogeneities were 2 × 2 cm square-shaped pieces made of aluminum foil. Each object was taped to the foam plastic surface with adhesive tape. The experiments confirmed the feasibility of the proposed solution.
Formation of Adhesive Bond
Published in Souheng Wu, Polymer Interface and Adhesion, 2017
The peel strength of a rubber adhesive (pressure-sensitive adhesive tape, γ1 = 20 dyne/cm) on various adherends correlates with the work of adhesion [10,11] (Table 11.3 and Figure 11.4). The straight line intersects σf = 0 at Wa, as predicted by Eq. (11.6). The work of peel Wp, calculated as Wp = (P/b)(l - cos θp), where P is the peel force, b the specimen width, and θp the peel angle, is many orders of magnitude greater than the work of adhesion, because of large viscoelastic dissipation in deforming the adhesive.
Experimental Investigation on Flow Past an Isolated Micro Pin Fin Embedded in a Microchannel
Published in Nanoscale and Microscale Thermophysical Engineering, 2021
Can Ji, Zhigang Liu, Mingming Lv, Jichao Li
The microdevice (Figure 1) consisted of two polymethyl methacrylate (PMMA) substrates, which were 70 mm long, 25 mm wide and 2.5 mm thick. On the bottom substrate, a 50 mm long(L), 2 mm wide(W) and 0.4 mm deep(H) microchannel was fabricated via CNC milling. A blind hole with a diameter of 0.4 mm was drilled in the middle of the microchannel. A through hole with the same diameter was drilled in the middle of the top substrate, and the inlet and outlet holes were also fabricated. The two substrates were bonded via 80 μm thick polyester double-sided adhesive tape. Then, the circular micro pin fin made of SUS304 stainless steel with a diameter(D) of 0.4 mm was embedded into the PMMA substrates. The pin fin penetrated the top substrate through the hole and inserted into the blind hole on the bottom substrate. In this way, liquid leakage from either ends of the pin fin into the microchannel was well prevented. The location of the pin fin was 25 mm downstream from the fluid inlet, which ensured the fully development of the flow. The microdevices with the pin fin’s aspect ratio of 0.5 and 1.5 were fabricated in the same way.
Wearable electronic textiles
Published in Textile Progress, 2019
David Tyler, Jane Wood, Tasneem Sabir, Chloe McDonnell, Abu Sadat Muhammad Sayem, Nick Whittaker
The gecko’s amazing ability to climb different surfaces, attach, and detach their feet within milliseconds has fascinated scientists around the world. Geckos do not intentionally stick to surfaces but are only attached by their feet. Gecko feet do not stick to dirt or particles, and as a result this keeps them clean and they require no pressure to stick to surfaces. Many scientists have studied gecko feet, and their research has led to the finding that gecko pads use intermolecular interactions to stick to surfaces. Through sophisticated scanning technology, tiny velvety hairs known as setae (finer than human hair) were discovered. The hair and the surface become charged leading to geckos sticking to surfaces. Traditional pressure-sensitive adhesive tapes require force to apply, degrade quickly, collect particles and tend to stick where they are not required, so they are now being replaced with tapes, which have been inspired by gecko feet into adhesive tape. Geckskin™ was revealed to the world in February 2012, where studies into Gecko toepads led to the adhesion and creation of a novel technology, as seen in Figure 15.
Suspension chemistry and electrophoretic deposition of YSZ-NiO nano-composite films on an iron-nickel based superalloy
Published in Journal of Dispersion Science and Technology, 2020
Naimeh Nazari, Hossein Aghajani
With regards to ASTM D3359 B test method, a pattern was created over the coating by a sharp cutting tool. As the coating thickness is less than 50 micrometers and according to the standard, the pattern contains 11 vertical and 11 horizontal lines which are spaced 1 millimeter apart from one another. Then a standard adhesive tape was applied firmly to the surface and peeled off quickly at an angle of 180°. Visual inspection of the test was based on the amount of coating detached from the surface. In this method, adhesion quality is evaluated on scale of 0B to 5B. 5B corresponds to excellent coating adhesion.