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Selection of Elastomer for Compliant Robotic Gripper Harnessed with IPMC Actuator
Published in Srijan Bhattacharya, Ionic Polymer–Metal Composites, 2022
Srijan Bhattacharya, Bikash Bepari, Subhasis Bhaumik
Polydimethylsiloxane (PDMS) is a polymeric organ silicon compound, which is also referred to as silicone. PDMS is an abundantly used silicon-based organic polymer and is better known for its flow properties. PDMS is transparent in nature and is generally inert, non-toxic and inflammable. PDMS is viscoelastic, which means it acts as a sticky fluid for a long flow times and at high temperatures. PDMS rubber also acts as an elastic solid for short flow time.
Applications
Published in Jun Ohta, Smart CMOS Image Sensors and Applications, 2020
Since the position of pn junction is different between two PDs, the wavelength at peak sensitivity is different. This feature of the stacked PD CMOS image sensor indicates that it can discriminate fluorescence from excitation light. Figure 5.34 shows the digital ELISA system by using CMOS image sensor with stacked PDs. A micro-fluidic device made of PDMS (polydimethylsiloxane) is used to form a micro-chamber array. The detailed structure is described in [366].
Controlled Release of Hormones by Pellet Implants
Published in Emmanuel Opara, Controlled Drug Delivery Systems, 2020
Various materials have been used to manufacture hormone delivery pellets. Polydimethylsiloxane (PDMS) is a silicone-based organic polymer present in silicone capsules and silicone adhesives (Silastic®, Dow corning). It has been proven to be useful in preparing steroid capsules or pellets, because Silastic® allows steroids to pass through its walls, providing a means of chronic administration of the drugs for long periods of time (Dziuk and Cook 1966, Elsaesser et al. 1989) and its chemical inertness avoids inflammatory reactions (Kivisaari and Niinikoski 1973). This component is also present in other low-cost, commercially available adhesives such as FASTIX® (Akapol SA, Argentina). Some manufacturers do not disclose the composition of the matrix in their hormone pellet and consider them as proprietary.
Wrinkling behavior of variable thickness films bonded to elastic substrates
Published in Mechanics of Advanced Materials and Structures, 2022
Hui Zheng, Peijian Chen, Hao Liu, Yingying Zhang, Juan Peng
The wrinkling behavior of variable thickness films bonded to elastic substrates is comprehensively analyzed in the present paper. The critical strain and the wrinkling morphology, and the corresponding morphology diagram affected by various geometric parameters are mainly focused. Commonly used materials in flexible electronics, that is, gold and polydimethylsiloxane (PDMS) are adopted for the film and the substrate, respectively. The corresponding material parameters, that is, are chosen [44]. In the present paper, the applied compressive strain is 0.83%, the film thickness of thinnest regions is chosen as unless otherwise stated.
Investigation on Flow Through Staggered Micro Pin Fin Arrays with Variable Longitudinal Spacings Using Micro-PIV
Published in Nanoscale and Microscale Thermophysical Engineering, 2022
Mingming Lv, Zhigang Liu, Wentao Chi, Chao Ma, Lian Duan
The schematic of the micro pin fin array is shown in Figure 1. The circular micro pin fins are distributed in the microchannel in a staggered arrangement. Three circular micro pin fin arrays with different longitudinal spacings (SL = 2D, 3D and 4D) were used in this study. Table 1 lists the dimensions of the three circular micro pin fin arrays. They are made of polydimethylsiloxane (PDMS), which is a widely used material in microfluidics research because of some unique advantages, such as high light transmission, excellent fabrication property, and low cost. The micro pin fin test section consists of two plates, upper PDMS plate and lower glass plate. It is carved out in the PDMS plate by soft lithography method. First, the micro pin fin arrays were designed using CAD software, and the silicon wafer mold with the designed network was fabricated by photolithography. Then, the 3D micro pin fin array was formed in a PDMS substrate by replica molding of the above mold. Finally, the PDMS substrate bonded with a glass coverslip to form the test section with micro pin fin arrays. In this study, the flow field in the middle region marked with gray color in Figure 1 was investigated.
Pervaporation separation of ethylacetate-ethanol mixtures using zeolite 13X-filled poly(dimethylsiloxane) membrane
Published in Chemical Engineering Communications, 2022
Sebnem Senol, Buket Kaya, Inci Salt, Berk Tirnakci, Yavuz Salt
Polydimethylsiloxane (PDMS) is a hydrophobic and nontoxic organic polymer having a flexible (Si–O) backbone (Lötters et al. 1997; Kausar 2020), and it has a higher free volume than glassy polymers, which allows them to exhibit better diffusion properties. PDMS can be used in many fields such as coatings, sensors, electronics, adhesives, membranes, biomedical applications, cosmetics, food industry, and lubricants (Vlassov et al. 2018; Kausar 2020). PDMS is an important membrane material in separating organic mixtures, and it offers advantages such as hydrophobicity, high thermal stability, low surface tension, biocompatibility and commercial availability (Lai et al. 2012; Liu et al. 2015; Vopicka et al. 2015; Wang et al. 2016). However, PDMS has poor mechanical properties due to its high chain mobility, and also, PDMS membranes generally exhibit high flux but low selectivity as a consequence of high free volume in the polymer network. Huang et al. (2006) reported that membrane performance improves with zeolite incorporation into the polymeric structure.