Статті в журналах: "PDMS-based"

1

Bergeron, V., P. Cooper, C. Fischer, J. Giermanska-Kahn, D. Langevin, and A. Pouchelon. "Polydimethylsiloxane (PDMS)-based antifoams." Colloids and Surfaces A: Physicochemical and Engineering Aspects 122, no. 1-3 (April 1997): 103–20. http://dx.doi.org/10.1016/s0927-7757(96)03774-0.

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2

Lopera, S., and R. D. Mansano. "Plasma-Based Surface Modification of Polydimethylsiloxane for PDMS-PDMS Molding." ISRN Polymer Science 2012 (April 3, 2012): 1–5. http://dx.doi.org/10.5402/2012/767151.

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We present and compare two processes for plasma-based surface modification of Polydimethylsiloxane (PDMS) to achieve the antisticking behavior needed for PDMS-PDMS molding. The studied processes were oxygen plasma activation for vapor phase silanization and plasma polymerization with tetrafluoromethane/hydrogen mixtures under different processing conditions. We analyzed topography changes of the treated surfaces by atomic force microscopy and contact angle measurements. Plasma treatment were conducted in a parallel plate reactive ion etching reactor at a pressure of 300 mTorr, 30 Watts of RF power and a total flow rate of 30 sccm of a gas mixture. We found for both processes that short, low power, treatments are better to create long-term modifications of the chemistry of the polymer surface while longer processes or thicker films tend to degrade faster with the use leaving rough surfaces with higher adherence to the molded material.

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3

Zhang, Y., F. Karasu, C. Rocco, L. G. J. van der Ven, R. A. T. M. van Benthem, X. Allonas, C. Croutxé-Barghorn, A. C. C. Esteves, and G. de With. "PDMS-based self-replenishing coatings." Polymer 107 (December 2016): 249–62. http://dx.doi.org/10.1016/j.polymer.2016.11.026.

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4

You, Jae Bem, Kyowon Kang, Thanh Tinh Tran, Hongkeun Park, Wook Ryol Hwang, Ju Min Kim, and Sung Gap Im. "PDMS-based turbulent microfluidic mixer." Lab on a Chip 15, no. 7 (2015): 1727–35. http://dx.doi.org/10.1039/c5lc00070j.

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5

Pergal, Marija, Jelena Nestorov, Gordana Tovilovic-Kovacevic, Petar Jovancic, Lato Pezo, Dana Vasiljevic-Radovic, and Jasna Djonlagic. "Surface characterization, hemo- and cytocompatibility of segmented poly(dimethylsiloxane)-based polyurethanes." Chemical Industry 68, no. 6 (2014): 731–41. http://dx.doi.org/10.2298/hemind141103082p.

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Segmented polyurethanes based on poly(dimethylsiloxane), currently used for biomedical applications, have sub-optimal biocompatibility which reduces their efficacy. Improving the endothelial cell attachment and blood-contacting properties of PDMS-based copolymers would substantially improve their clinical applications. We have studied the surface properties and in vitro biocompatibility of two series of segmented poly(urethane-dimethylsiloxane)s (SPU-PDMS) based on hydroxypropyl- and hydroxyethoxypropyl- terminated PDMS with potential applications in blood-contacting medical devices. SPU-PDMS copolymers were characterized by contact angle measurements, surface free energy determination (calculated using the van Oss-Chaudhury-Good and Owens-Wendt methods), and atomic force microscopy. The biocompatibility of copolymers was evaluated using an endothelial EA.hy926 cell line by direct contact assay, before and after pre-treatment of copolymers with multicomponent protein mixture, as well as by a competitive blood-protein adsorption assay. The obtained results suggested good blood compatibility of synthesized copolymers. All copolymers exhibited good resistance to fibrinogen adsorption and all favored albumin adsorption. Copolymers based on hydroxyethoxypropyl-PDMS had lower hydrophobicity, higher surface free energy, and better microphase separation in comparison with hydroxypropyl-PDMS-based copolymers, which promoted better endothelial cell attachment and growth on the surface of these polymers as compared to hydroxypropyl-PDMS-based copolymers. The results showed that SPU-PDMS copolymers display good surface properties, depending on the type of soft PDMS segments, which can be tailored for biomedical application requirements such as biomedical devices for short- and long-term uses.

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6

Kwon, Dae-Hyeon, Jaebum Jeong, Yongju Lee, Jun-Kyu Park, Suwoong Lee, Jin-Hyuk Bae, and Hyeok Kim. "Carbon Nano Tube-Polymer Hybrid Nanocomposite Electrodes for Porous Polydimethylsiloxane Sponge-Based Flexible Triboelectric Nanogenerators." Journal of Nanoscience and Nanotechnology 21, no. 9 (September 1, 2021): 4680–84. http://dx.doi.org/10.1166/jnn.2021.19297.

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Flexible triboelectric nanogenerators (TENGs) have attracted much attention because of its environmentally friendly, practical, and cost-producing advantages. In flexible TENGs, it is important to study the flexible electrodes in order to fabricate the fully flexible devices. Here, we compared electrical characteristics of the sponge porous polydimethylsiloxane (PDMS)-based flexible TENGs with two types of flexible electrodes, copper and carbon nanotube (CNT)-PDMS electrodes. The output voltage and maximum power density of sponge PDMS-based flexible TENGs with copper and CNTPDMS electrodes were compared. The voltage and power density of sponge PDMS-based flexible TENGs with CNT-PDMS electrodes were improved compare to those with copper electrodes. The output voltage and the maximum power density of sponge PDMS-based flexible TENGs with copper and CNT-PDMS electrodes increased 4 times and 7 times, respectively. It is attributed to higher electrical conductivity and stably flow electricity of CNT than those of copper.

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7

Tan, Xueqiang, and Jimin Zheng. "A Novel Porous PDMS-AgNWs-PDMS (PAP)-Sponge-Based Capacitive Pressure Sensor." Polymers 14, no. 8 (April 7, 2022): 1495. http://dx.doi.org/10.3390/polym14081495.

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The development of capacitive pressure sensors with low cost, high sensitivity and facile fabrication techniques is desirable for flexible electronics and wearable devices. In this project, a highly sensitive and flexible capacitive pressure sensor was fabricated by sandwiching a porous PAP sponge dielectric layer between two copper electrodes. The porous PAP sponge dielectric layer was fabricated by introducing highly conductive silver nanowires (AgNWs) into the PDMS sponge with 100% sucrose as a template and with a layer of polydimethylsiloxane (PDMS) film coating the surface. The sensitivity of the PAP sponge capacitive pressure sensor was optimized by increasing the load amount of AgNWs. Experimental results demonstrated that when the load amount of AgNWs increased to 150 mg in the PAP sponge, the sensitivity of the sensor was the highest in the low-pressure range of 0–1 kPa, reaching 0.62 kPa−1. At this point, the tensile strength and elongation of sponge were 1.425 MPa and 156.38%, respectively. In addition, the specific surface area of PAP sponge reached 2.0 cm2/g in the range of 0–10 nm pore size, and showed excellent waterproof performance with high elasticity, low hysteresis, light weight, and low density. Furthermore, as an application demonstration, ~110 LED lights were shown to light up when pressed onto the optimized sensor. Hence, this novel porous PAP-sponge-based capacitive pressure sensor has a wide range of potential applications in the field of wearable electronics.

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8

Kim, Jinook, Mikyung Park, Gee Sung Chae, and In-Jae Chung. "Influence of un-cured PDMS chains in stamp using PDMS-based lithography." Applied Surface Science 254, no. 16 (June 2008): 5266–70. http://dx.doi.org/10.1016/j.apsusc.2008.02.074.

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9

Šustková, Alena, Klára Konderlová, Ester Drastíková, Stefan Sützl, Lenka Hárendarčíková, and Jan Petr. "Rapid Production of PDMS Microdevices for Electrodriven Separations and Microfluidics by 3D-Printed Scaffold Removal." Separations 8, no. 5 (May 14, 2021): 67. http://dx.doi.org/10.3390/separations8050067.

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In our work, we produced PDMS-based microfluidic devices by mechanical removal of 3D-printed scaffolds inserted in PDMS. Two setups leading to the fabrication of monolithic PDMS-based microdevices and bonded (or stamped) PDMS-based microdevices were designed. In the monolithic devices, the 3D-printed scaffolds were fully inserted in the PDMS and then carefully removed. The bonded devices were produced by forming imprints of the 3D-printed scaffolds in PDMS, followed by bonding the PDMS parts to glass slides. All these microfluidic devices were then successfully employed in three proof-of-concept applications: capture of magnetic microparticles, formation of droplets, and isotachophoresis separation of model organic dyes.

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10

Xu, Guang Tao, Yi Qing Gao, Feng Li, Xiao Feng Cui, and Guo Wen Kuang. "Design and Fabrication of PDMS MLA Based on Digital Maskless Lithography Method." Advanced Materials Research 1091 (February 2015): 71–76. http://dx.doi.org/10.4028/www.scientific.net/amr.1091.71.

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Polymer MLA is fabricated by used of the DMD-based maskless lithography method. The process flow is described in this paper. The obtained photoresist concave MLA, which is used as a pattern to fabricate PDMS convex MLA, and the resulted PDMS MLA are measured with 3D surface profiler based on scanning white light interferometry. Besides, the transmission and reflection spectrum of PDMS film sample are also measured and used to calculate the refractive index of the PDMS film.

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11

Penso, Camila M., João L. Rocha, Marcos S. Martins, Paulo J. Sousa, Vânia C. Pinto, Graça Minas, Maria M. Silva, and Luís M. Goncalves. "PtOEP–PDMS-Based Optical Oxygen Sensor." Sensors 21, no. 16 (August 21, 2021): 5645. http://dx.doi.org/10.3390/s21165645.

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The advanced and widespread use of microfluidic devices, which are usually fabricated in polydimethylsiloxane (PDMS), requires the integration of many sensors, always compatible with microfluidic fabrication processes. Moreover, current limitations of the existing optical and electrochemical oxygen sensors regarding long-term stability due to sensor degradation, biofouling, fabrication processes and cost have led to the development of new approaches. Thus, this manuscript reports the development, fabrication and characterization of a low-cost and highly sensitive dissolved oxygen optical sensor based on a membrane of PDMS doped with platinum octaethylporphyrin (PtOEP) film, fabricated using standard microfluidic materials and processes. The excellent mechanical and chemical properties (high permeability to oxygen, anti-biofouling characteristics) of PDMS result in membranes with superior sensitivity compared with other matrix materials. The wide use of PtOEP in sensing applications, due to its advantage of being easily synthesized using microtechnologies, its strong phosphorescence at room temperature with a quantum yield close to 50%, its excellent Strokes Shift as well as its relatively long lifetime (75 µs), provide the suitable conditions for the development of a miniaturized luminescence optical oxygen sensor allowing long-term applications. The influence of the PDMS film thickness (0.1–2.5 mm) and the PtOEP concentration (363, 545, 727 ppm) in luminescent properties are presented. This enables to achieve low detection levels in a gas media range from 0.5% up to 20%, and in liquid media from 0.5 mg/L up to 3.3 mg/L at 1 atm, 25 °C. As a result, we propose a simple and cost-effective system based on a LED membrane photodiode system to detect low oxygen concentrations for in situ applications.

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12

Pudis, Dusan, Daniel Jandura, Peter Gaso, Lubos Suslik, Pavol Hronec, Ivan Martincek, Jaroslav Kovac, and Sofia Berezina. "PDMS-Based Nanoimprint Lithography for Photonics." Communications - Scientific letters of the University of Zilina 16, no. 1 (February 28, 2014): 15–20. http://dx.doi.org/10.26552/com.c.2014.1.15-20.

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13

Tian, T. F., X. Z. Zhang, W. H. Li, G. Alici, and J. Ding. "Study of PDMS based magnetorheological elastomers." Journal of Physics: Conference Series 412 (February 15, 2013): 012038. http://dx.doi.org/10.1088/1742-6596/412/1/012038.

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14

Dodge, Arash, Edouard Brunet, Suelin Chen, Jacques Goulpeau, Val?rie Labas, Joelle Vinh, and Patrick Tabeling. "PDMS-based microfluidics for proteomic analysis." Analyst 131, no. 10 (2006): 1122. http://dx.doi.org/10.1039/b606394b.

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15

Wu, Wen-Ya, Xiaoqin Zhong, Wei Wang, Qiang Miao, and Jun-Jie Zhu. "Flexible PDMS-based three-electrode sensor." Electrochemistry Communications 12, no. 11 (November 2010): 1600–1604. http://dx.doi.org/10.1016/j.elecom.2010.09.005.

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16

Alencar, Andreza Leite de, and Ana Carolina Salgado. "Improving User Interaction on Ontology-based Peer Data Management Systems." iSys - Brazilian Journal of Information Systems 7, no. 2 (November 15, 2014): 67–85. http://dx.doi.org/10.5753/isys.2014.252.

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The issue of user interaction for query formulation and execution has been investigated for distributed and dynamic environments, such as Peer Data Management System (PDMS). Many of these PDMS are semantic based and composed by data peers which export schemas that are represented by ontologies. In the literature we can find some proposed PDMS interfaces, but none of them addresses, in a general way, the needs of a PDMS for user interaction. In this work we propose a visual user query interface for ontology-based PDMS. It provides a simple and straightforward interaction with this type of system. It aims not only providing a natural visual query interface but also supporting a precise and direct manipulation of the data schemas for query generation.

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17

Zhang, Nai Qiang, Jian Dong, and Hong Yu Chen. "Preparation and Characterization of Elastomers Based on Polydimethylsiloxane/Poly(methyl methacrylate) Blends." Advanced Materials Research 535-537 (June 2012): 1193–96. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.1193.

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Polydimethylsiloxane/poly (methyl methacrylate) (PDMS/PMMA) blends were prepared by radical copolymerization of methyl methacrylate (MMA) and divinylbenzene (DVB) in the presence of PDMS. Elastomers based on PDMS/PMMA blends were formed by cross-linking PDMS with methyltriethoxysilane (MTES). Mechanical property measurements show that the elastomers thus formed exhibit superior tensile strength with respect to general room temperature vulcanized silicone elastomers containing silica. Moreover, investigations were carried out on the elastomers by extraction, scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) measurements. SEM shows that the elastomer has a microphase-separated structure consisting of dispersed PMMA domains within a continuous PDMS matrix. DSC result shows that the elastomers display two glass transition temperatures and confirm the incompatible nature of PDMS and PMMA.

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18

Kim, Gang-Min, Sung-Jun Lee, and Chang-Lae Kim. "Assessment of the Physical, Mechanical, and Tribological Properties of PDMS Thin Films Based on Different Curing Conditions." Materials 14, no. 16 (August 10, 2021): 4489. http://dx.doi.org/10.3390/ma14164489.

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Polydimethylsiloxane (PDMS), a silicone-based elastomeric polymer, is generally cured by applying heat to a mixture of a PDMS base and crosslinking agent, and its material properties differ according to the mixing ratio and heating conditions. In this study, we analyzed the effects of different curing processes on the various properties of PDMS thin films prepared by mixing a PDMS solution comprising a PDMS base and a crosslinking agent in a ratio of 10:1. The PDMS thin films were cured using three heat transfer methods: convection heat transfer using an oven, conduction heat transfer using a hotplate, and conduction heat transfer using an ultrasonic device that generates heat internally from ultrasonic vibrations. The physical, chemical, mechanical, and tribological properties of the PDMS thin films were assessed after curing. The polymer chains in the PDMS thin films varied according to the heat transfer method, which resulted in changes in the mechanical and tribological properties. The ultrasonicated PDMS thin film exhibited the highest crystallinity, and hence, the best mechanical, friction, and wear properties.

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19

Lancastre, J. J. H., N. Fernandes, F. M. A. Margaça, I. M. Miranda Salvado, L. M. Ferreira, A. N. Falcão, and M. H. Casimiro. "Study of PDMS conformation in PDMS-based hybrid materials prepared by gamma irradiation." Radiation Physics and Chemistry 81, no. 9 (September 2012): 1336–40. http://dx.doi.org/10.1016/j.radphyschem.2012.02.016.

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20

Lee, Sung-Jun, Gang-Min Kim, and Chang-Lae Kim. "Effect of Glass Bubbles on Friction and Wear Characteristics of PDMS-Based Composites." Coatings 11, no. 5 (May 19, 2021): 603. http://dx.doi.org/10.3390/coatings11050603.

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The purpose of this study is to improve the mechanical durability and surface frictional characteristics of polymer/ceramic-based composite materials. Polydimethylsiloxane (PDMS)/glass bubble (GB) composite specimens are prepared at various weight ratios (PDMS:GB) by varying the amount of micro-sized GBs added to the PDMS. The surface, mechanical, and tribological characteristics of the PDMS/GB composites are evaluated according to the added ratios of GBs. The changes in internal stress according to the indentation depth after contacting with a steel ball tip to the bare PDMS and PDMS/GB composites having different GB densities are compared through finite element analysis simulation. The elastic modulus is proportional to the GB content, while the friction coefficient generally decreases as the GB content increases. A smaller amount of GB in the PDMS/GB composite results in more surface damage than the bare PDMS, but a significant reduction in wear rate is achieved when the ratio of PDMS:GB is greater than 100:5.

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21

Li, Yong Qing, Xi Zhu, Zhong Luo, and Wei Hong Sun. "Research for Damping Behavior and Microstructure of Interpenetrating Polymer Networks Based on Multi-Components." Advanced Materials Research 328-330 (September 2011): 1177–81. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.1177.

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Based on the molecule design and energy absorption theory of polymer macromolecule materials, we synthesized a kind of multicomponents interpenetrating polymer network(IPN) which composed of polyurethane(PU), epoxy(EP) and unsaturated polymer resin(UPR). In order to further widen the damping temperature region of polymer materials, we introduced the polydimethylsiloxane (PDMS) into polyurethane(PU). Because of solubility parameter difference between PDMS and PU, we synthesized PDMS modified PU by blocking and grafting PDMS chain into PU main chain firstly. Then, a serious of interpenetrating polymer networks (IPN) which composed of PDMS-PU, EP and UPR were designed and synthesized. The damping performance and microstructure were characterized by using the spectrum of dynamic mechanical thermal analysis (DMTA) and the scanning electron microscope(SEM) respectively. The tested result indicated that the multicomponents IPN which modified by PDMS has wider temperature range and higher damping loss factor, and the PDMS grafting PU/EP/UPR shows good damping performance and microphase compatibility specially.

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22

Kemkemer, Ralf, Zhang Zenghao, Yang Linxiao, Kiriaki Athanasopulu, Kerstin Frey, Zhishan Cui, Haijia Su, and Liu Luo. "Surface modification of Polydimethylsiloxane by hydrogels for microfluidic applications." Current Directions in Biomedical Engineering 5, no. 1 (September 1, 2019): 93–96. http://dx.doi.org/10.1515/cdbme-2019-0024.

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AbstractIn vitro, hydrogel-based ECMs for functionalizing surfaces of various material have played an essential role in mimicking native tissue matrix. Polydimethylsiloxane (PDMS) is widely used to build microfluidic or organ-on-chip devices compatible with cells due to its easy handling in cast replication. Despite such advantages, the limitation of PDMS is its hydrophobic surface property. To improve wettability of PDMS-based devices, alginate, a naturally derived polysaccharide, was covalently bound to the PDMS surface. This alginate then crosslinked further hydrogel onto the PDMS surface in desired layer thickness. Hydrogel-modified PDMS was used for coating a topography chip system and in vitro investigation of cell growth on the surfaces. Moreover, such hydrophilic hydrogel-coated PDMS is utilized in a microfluidic device to prevent unspecific absorption of organic solutions. Hence, in both exemplary studies, PDMS surface properties were modified leading to improved devices.

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23

Chen, Longlong, Xin Chen, Zhihan Zhang, Tongkuai Li, Tingting Zhao, Xifeng Li, and Jianhua Zhang. "PDMS-Based Capacitive Pressure Sensor for Flexible Transparent Electronics." Journal of Sensors 2019 (June 4, 2019): 1–6. http://dx.doi.org/10.1155/2019/1418374.

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We propose a flexible pressure sensor based on polydimethylsiloxane (PDMS) and transparent electrodes. The transmittance of the total device is 82% and the minimum bending radius is 18 mm. Besides, the effect of annealing temperature on the mechanical properties of PDMS is reported here. The results show that the PDMS film under lower annealing temperature of 80°C has good compression property but poor dynamic response. While for higher temperatures, the compression property of PDMS films significantly reduced. The best compromise of annealing temperature between compression property and dynamic response is found for PDMS film of about 110°C. The pressure sensor under 110°C curing temperature shows a good sensitivity of 0.025 kPa−1 and robust response property. The device shows a promising route for future intelligent transparent sensing applications.

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24

Vlassov, S., S. Oras, M. Antsov, I. Sosnin, B. Polyakov, A. Shutka, M. Yu Krauchanka, and L. M. Dorogin. "Adhesion and Mechanical Properties of PDMS-Based Materials Probed with AFM: A Review." REVIEWS ON ADVANCED MATERIALS SCIENCE 56, no. 1 (May 1, 2018): 62–78. http://dx.doi.org/10.1515/rams-2018-0038.

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Abstract Polydimethylsiloxane (PDMS) is the most widely used silicon-based organic polymer, and is particularly known for its unusual rheological properties. PDMS has found extensive usage in various fields ranging from microfluidics and flexible electronics to cosmetics and food industry. In certain applications, like e.g. dry adhesives or dry transfer of 2D materials, adhesive properties of PDMS play crucial role. In this review we focus on probing the mechanical and adhesive properties of PDMS by means of atomic force microscopy (AFM). Main advantages and limitations of AFM-based measurements in comparison to macroscopic tests are discussed.

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25

Iwata, Y., S. Otora, T. Uno, and M. Kubo. "Synthesis of PDMS-grafted-polyether and its application to polymer electrolyte." Journal of Physics: Conference Series 2266, no. 1 (May 1, 2022): 012012. http://dx.doi.org/10.1088/1742-6596/2266/1/012012.

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Abstract A terpolymer, poly(ethylene oxide-co-propylene oxide-co-allyl glycidyl ether) (P(EO/PO/AGE)), was reacted with linear mono-functional hydride-terminated polydimethylsiloxane (PDMS-SiH) to obtain PDMS-grafted-polyether (PDMS-g-P(EO/PO/AGE)) by hydrosilylation. Three polyelectrolytes were prepared based on PDMS-g-P(EO/PO/AGE). Best result was obtained when 8wt% of PDMS was introduced onto polyether. Cyclic voltammetry measurement of the PDMS-g-P(EO/PO/AGE polyelectrolytes showed improvement of oxidative stability.

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26

Banerjee, Sovan Lal, Sarthik Samanta, Shrabana Sarkar, and Nikhil K. Singha. "A self-healable and antifouling hydrogel based on PDMS centered ABA tri-block copolymer polymersomes: a potential material for therapeutic contact lenses." Journal of Materials Chemistry B 8, no. 2 (2020): 226–43. http://dx.doi.org/10.1039/c9tb00949c.

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We have prepared an antifouling and self-healable PDMS based hydrogel which consists of a mixture of curcumin loaded zwitterionic PDMS polymersomes and amine functionalized PDMS polymersomes prepared via RAFT polymerization and Schiff-base reaction.

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27

Shin, Eun Ae, Sang Bong Lee, Gye Hyeon Kim, Jeyoung Jung, and Chang Kee Lee. "Enhanced Interfacial Adhesion of Polydimethylsiloxane (PDMS) by Control of the Crosslink Density." Journal of Nanoscience and Nanotechnology 20, no. 11 (November 1, 2020): 6768–75. http://dx.doi.org/10.1166/jnn.2020.18804.

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In this paper, we report a simple, fast, and one-step approach to improve the adhesion force of polydimethylsiloxane (PDMS) by incorporating inorganic nanoparticles that can control the physical, mechanical, and adhesion properties of the PDMS. An organic/inorganic PDMS-based composite was fabricated by the hydrosilylation of vinyl-decorated silica nanoparticles (v-SNPs) and the PDMS. The v-SNP/PDMS composite showed a significantly decreased elastic modulus and increased elongation compared with that of pristine SNPs incorporated with the PDMS composite (SNP/PDMS) and pristine PDMS. Furthermore, the v-SNP/PDMS composite exhibited a low glass-transition temperature and sharp crystallization and melting peaks in the differential scanning calorimetry curve compared with those of pristine PDMS and the SNP/PDMS composite. Moreover, the v-SNP/PDMS composite showed a high swelling ratio and crosslinked molecular weight and low gel fraction. These results may originate from the suppression of the PDMS-curing networks as the addition of the v-SNPs creates a low curing density because of the chemical bonding between PDMS and the v-SNPs. Finally, the v-SNP/PDMS composite showed an improvement of ~426% in the adhesion force compared with pristine PDMS and the SNP/PDMS composite. We anticipate that this v-SNP/PDMS composite could be used as a highly adhesive and hydrophobic coating material for various applications in industry.

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28

Lee, Sung-Jun, Yoon-Chul Sohn, and Chang-Lae Kim. "Friction and Wear Characteristics of Polydimethylsiloxane under Water-Based Lubrication Conditions." Materials 15, no. 9 (May 2, 2022): 3262. http://dx.doi.org/10.3390/ma15093262.

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In this study, the friction and wear characteristics of polydimethylsiloxane (PDMS) were evaluated when using lubricants created by adding surfactants at various ratios to deionized (DI) water. When pure DI water is used as a lubricant, the repulsion of water from the hydrophobic PDMS surface is large and the interfacial affinity is low; thus, the lubrication properties cannot be significantly improved. However, when a lubricant with a surfactant is added to DI water, the interfacial affinity with the PDMS surface increases to form a lubricating film, and the friction coefficient is greatly reduced. In this study, under dry and pure DI water conditions, severe wear tracks were formed on the PDMS surface after 10,000 cycles of reciprocating sliding motion under a vertical load of 100 mN, whereas in the case of the surfactant-based and water-based lubricant, no severe wear tracks occurred. The friction and wear characteristics of the PDMS were evaluated by increasing the normal loads and sliding cycles with a water-based lubricant containing 1 wt % surfactant. Under normal loads of 300 mN and 500 mN, only minor scratches occurred on the PDMS surface up to 10,000 and 100,000 cycles, respectively, but after 300,000 cycles, very severe pit wear tracks occurred.

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29

Choi, Taeyi, Jadwiga Weksler, Ajay Padsalgikar, Rebeca Hernéndez, and James Runt. "Polydimethylsiloxane-Based Polyurethanes: Phase-Separated Morphology and In Vitro Oxidative Biostability." Australian Journal of Chemistry 62, no. 8 (2009): 794. http://dx.doi.org/10.1071/ch09096.

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Three series of segmented polyurethane block copolymers were synthesized using 4,4′-methylenediphenyl diisocyanate (MDI) and 1,4-butanediol (BDO) or 1,3-bis(4-hydroxybutyl)tetramethyl disiloxane (BHTD) as the hard segments, and soft segments composed of poly(dimethyl siloxane) (PDMS)-based and poly(hexamethylene oxide) (PHMO) macrodiols. Copolymers synthesized with the PDMS macrodiol and PDMS and PHMO macrodiol mixtures consist of three microphases: a PDMS phase, hard domains, and a mixed phase of PHMO (when present), PDMS ether end-group segments and some dissolved hard segments. Degrees of phase separation were characterized using small-angle X-ray scattering by applying a pseudo two-phase model, and the morphology resulting from unlike segment demixing was found to be closely related to the in vitro oxidative biostability of these segmented polyurethanes.

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30

Hirama, Hirotada, Ryutaro Otahara, Shinya Kano, Masanori Hayase, and Harutaka Mekaru. "Characterization of Nanoparticle Adsorption on Polydimethylsiloxane-Based Microchannels." Sensors 21, no. 6 (March 11, 2021): 1978. http://dx.doi.org/10.3390/s21061978.

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Nanoparticles (NPs) are used in various medicinal applications. Exosomes, bio-derived NPs, are promising biomarkers obtained through separation and concentration from body fluids. Polydimethylsiloxane (PDMS)-based microchannels are well-suited for precise handling of NPs, offering benefits such as high gas permeability and low cytotoxicity. However, the large specific surface area of NPs may result in nonspecific adsorption on the device substrate and thus cause sample loss. Therefore, an understanding of NP adsorption on microchannels is important for the operation of microfluidic devices used for NP handling. Herein, we characterized NP adsorption on PDMS-based substrates and microchannels by atomic force microscopy to correlate NP adsorptivity with the electrostatic interactions associated with NP and dispersion medium properties. When polystyrene NP dispersions were introduced into PDMS-based microchannels at a constant flow rate, the number of adsorbed NPs decreased with decreasing NP and microchannel zeta potentials (i.e., with increasing pH), which suggested that the electrostatic interaction between the microchannel and NPs enhanced their repulsion. When exosome dispersions were introduced into PDMS-based microchannels with different wettabilities at constant flow rates, exosome adsorption was dominated by electrostatic interactions. The findings obtained should facilitate the preconcentration, separation, and sensing of NPs by PDMS-based microfluidic devices.

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31

Huang, Zhengqiang, Wei Wu, Dietmar Drummer, Chao Liu, Yi Wang, and Zhengyi Wang. "Enhanced the Thermal Conductivity of Polydimethylsiloxane via a Three-Dimensional Hybrid Boron Nitride@Silver Nanowires Thermal Network Filler." Polymers 13, no. 2 (January 13, 2021): 248. http://dx.doi.org/10.3390/polym13020248.

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In this work, polydimethylsiloxane (PDMS)-based composites with high thermal conductivity were fabricated via a three-dimensional hybrid boron nitride@silver nanowires (BN@AgNWs) filler thermal network, and their thermal conductivity was investigated. A new thermal conductive BN@AgNWs hybrid filler was prepared by an in situ growth method. Silver ions with the different concentrations were reduced, and AgNWs crystallized and grew on the surface of BN sheets. PDMS-based composites were fabricated by the BN@AgNWs hybrid filler added. SEM, XPS, and XRD were used to characterize the structure and morphology of BN@AgNWs hybrid fillers. The thermal conductivity performances of PDMS-based composites with different silver concentrates were investigated. The results showed that the thermal conductivity of PDMS-based composite filled with 20 vol% BN@15AgNWs hybrid filler is 0.914 W/(m·K), which is 5.05 times that of pure PDMS and 23% higher than the thermal conductivity of 20 vol% PDMS-based composite with BN filled. The enhanced thermal conductivity mechanism was provided based on the hybrid filler structure. This work offers a new way to design and fabricate the high thermal conductive hybrid filler for thermal management materials.

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32

Xia, Yanming, Xianglong Chu, Caiming Zhao, Nanxin Wang, Juan Yu, Yufeng Jin, Lijun Sun, and Shenglin Ma. "A Glass–Ultra-Thin PDMS Film–Glass Microfluidic Device for Digital PCR Application Based on Flexible Mold Peel-Off Process." Micromachines 13, no. 10 (October 4, 2022): 1667. http://dx.doi.org/10.3390/mi13101667.

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The microfluidic device (MFD) with a glass–PDMS–glass (G-P-G) structure is of interest for a wide range of applications. However, G-P-G MFD fabrication with an ultra-thin PDMS film (especially thickness less than 200 μm) is still a big challenge because the ultra-thin PDMS film is easily deformed, curled, and damaged during demolding and transferring. This study aimed to report a thickness-controllable and low-cost fabrication process of the G-P-G MFD with an ultra-thin PDMS film based on a flexible mold peel-off process. A patterned photoresist layer was deposited on a polyethylene terephthalate (PET) film to fabricate a flexible mold that could be demolded softly to achieve a rigid structure of the glass–PDMS film. The thickness of ultra-thin patterned PDMS could reach less than 50 μm without damage to the PDMS film. The MFD showcased the excellent property of water evaporation inhibition (water loss < 10%) during PCR thermal cycling because of the ultra-thin PDMS film. Its low-cost fabrication process and excellent water evaporation inhibition present extremely high prospects for digital PCR application.

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33

Pérez-Sosa, Camilo, Ana Belén Peñaherrera-Pazmiño, Gustavo Rosero, Natalia Bourguignon, Aparna Aravelli, Shekhar Bhansali, Maximiliano Sebastian Pérez, and Betiana Lerner. "Novel Reproducible Manufacturing and Reversible Sealing Method for Microfluidic Devices." Micromachines 13, no. 5 (April 19, 2022): 650. http://dx.doi.org/10.3390/mi13050650.

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Conventional manufacturing methods for polydimethylsiloxane (PDMS)-based microdevices require multiple steps and elements that increase cost and production time. Also, these PDMS microdevices are mostly limited to single use, and it is difficult to recover the contents inside the microchannels or perform advanced microscopy visualization due to their irreversible sealing method. Herein, we developed a novel manufacturing method based on polymethylmethacrylate (PMMA) plates adjusted using a mechanical pressure-based system. One conformation of the PMMA plate assembly system allows the reproducible manufacture of PDMS replicas, reducing the cost since a precise amount of PDMS is used, and the PDMS replicas show uniform dimensions. A second form of assembling the PMMA plates permits pressure-based sealing of the PDMS layer with a glass base. By reversibly sealing the microdevice without using plasma for bonding, we achieve chip on/off configurations, which allow the user to open and close the device and reuse it in an easy-to-use way. No deformation was observed on the structures of the PDMS microchannels when a range of 10 to 18 kPa pressure was applied using the technique. Furthermore, the functionality of the proposed system was successfully validated by the generation of microdroplets with reused microdevices via three repetitions.

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34

Kim, Jeong Ah, Seung Hwan Lee, Hongsuk Park, Jong Hyo Kim, and Tai Hyun Park. "Microheater based on magnetic nanoparticle embedded PDMS." Nanotechnology 21, no. 16 (March 30, 2010): 165102. http://dx.doi.org/10.1088/0957-4484/21/16/165102.

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35

Xiaoyu, J., N. Zhiqiang, C. Wenyuan, and Z. Weiping. "Polydimethylsiloxane (PDMS)-based spiral channel PCR chip." Electronics Letters 41, no. 16 (2005): 890. http://dx.doi.org/10.1049/el:20051396.

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36

Rehman, Tariq, Marwan Nafea, Ahmad Athif Faudzi, Tanveer Saleh, and Mohamed Sultan Mohamed Ali. "PDMS-based dual-channel pneumatic micro-actuator." Smart Materials and Structures 28, no. 11 (October 23, 2019): 115044. http://dx.doi.org/10.1088/1361-665x/ab4ac1.

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37

Cadarso, V. J., A. Llobera, G. Villanueva, J. A. Plaza, J. Brugger, and C. Dominguez. "Mechanically tuneable microoptical structure based on PDMS." Sensors and Actuators A: Physical 162, no. 2 (August 2010): 260–66. http://dx.doi.org/10.1016/j.sna.2010.02.025.

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38

Fujii, Teruo. "PDMS-based microfluidic devices for biomedical applications." Microelectronic Engineering 61-62 (July 2002): 907–14. http://dx.doi.org/10.1016/s0167-9317(02)00494-x.

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39

Cadarso, V. J., A. Llobera, G. Villanueva, J. A. Plaza, J. Brugger, and C. Dominguez. "Mechanically tuneable microoptical structure based on PDMS." Procedia Chemistry 1, no. 1 (September 2009): 560–63. http://dx.doi.org/10.1016/j.proche.2009.07.140.

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40

Torino, Stefania, Brunella Corrado, Mario Iodice, and Giuseppe Coppola. "PDMS-Based Microfluidic Devices for Cell Culture." Inventions 3, no. 3 (September 6, 2018): 65. http://dx.doi.org/10.3390/inventions3030065.

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Microfluidic technology has affirmed itself as a powerful tool in medical and biological research by offering the possibility of managing biological samples in tiny channels and chambers. Among the different applications, the use of microfluidics for cell cultures has attracted much interest from scientists worldwide. Traditional cell culture methods need high quantities of samples and reagents that are strongly reduced in miniaturized systems. In addition, the microenvironment is better controlled by scaling down. In this paper, we provide an overview of the aspects related to the design of a novel microfluidic culture chamber, the fabrication approach based on polydimethylsiloxane (PDMS) soft-lithography, and the most critical issues in shrinking the size of the system.

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41

Cadarso, V. J., A. Llobera, G. Villanueva, C. Dominguez, and J. A. Plaza. "3-D modulable PDMS-based microlens system." Optics Express 16, no. 7 (March 26, 2008): 4918. http://dx.doi.org/10.1364/oe.16.004918.

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42

Zhou, Jinwen, Dmitriy A. Khodakov, Amanda V. Ellis, and Nicolas H. Voelcker. "Surface modification for PDMS-based microfluidic devices." ELECTROPHORESIS 33, no. 1 (November 30, 2011): 89–104. http://dx.doi.org/10.1002/elps.201100482.

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43

Armstrong, Michael R., Paulius V. Grivickas, April M. Sawvel, James P. Lewicki, Jonathan C. Crowhurst, Joseph M. Zaug, Harry B. Radousky, et al. "Ultrafast shock compression of PDMS-based polymers." Journal of Polymer Science Part B: Polymer Physics 56, no. 11 (February 16, 2018): 827–32. http://dx.doi.org/10.1002/polb.24589.

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44

Dinh, T. H. N., E. Martincic, E. Dufour-Gergam, and P. Y. Joubert. "Mechanical Characterization of PDMS Films for the Optimization of Polymer Based Flexible Capacitive Pressure Microsensors." Journal of Sensors 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/8235729.

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This paper reports on the optimization of flexible PDMS-based normal pressure capacitive microsensors dedicated to wearable applications. The operating principle and the fabrication process of such microsensors are presented. Then, the deformations under local pressure of PDMS thin films of thicknesses ranging from 100 μm to 10 mm are studied by means of numerical simulations in order to foresee the sensitivity of the considered microsensors. The study points out that, for a given PDMS type, the sensor form ratio plays a major role in its sensitivity. Indeed, for a given PDMS film, the expected capacitance change under a 10 N load applied on a 1.7 mm radius electrode varies from a few percent to almost 40% according to the initial PDMS film thickness. These observations are validated by experimental characterizations carried out on PDMS film samples of various thicknesses (10 μm to 10 mm) and on actual microsensors. Further computations enable generalized sensor design rules to be highlighted. Considering practical limitations in the fabrication and in the implementation of the actual microsensors, design rules based on computed form ratio optimization lead to the elaboration of flexible pressure microsensors exhibiting a sensitivity which reaches up to10%/N.

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45

Zubaidah, Isa, Abdullah Norfatriah, Serbini Zatul Amali, and Abu Zuruzi. "Preparation and Behavior of Bamboo Fiber-Reinforced Polydimethylsiloxane Composite Foams during Compression." Fibers 6, no. 4 (November 29, 2018): 91. http://dx.doi.org/10.3390/fib6040091.

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This study investigates the mechanical properties of bamboo fiber-reinforced polydimethylsiloxane (BF-PDMS) foams with up to 3.4% (by mass) fiber during compression. Pristine PDMS foams and BF-PDMS composite foams were fabricated using a sugar leaching method. Compression test results of pristine PDMS and BF-PDMS composite foams display plateau and densification regions. Predictions of a modified phenomenological foam (PF) model based on Maxwell and Kelvin–Voight models are in good agreement with compression test results. Stiffness coefficients were extracted by fitting results of compression tests to the modified PF model. Spring and densification coefficients of BF-PDMS composite foams are 2.5- and 15-fold greater than those of pristine PDMS foams, respectively. Strains corresponding to onset of densification computed using extracted coefficients were 35% and 25% for pristine PDMS foams and BF-PDMS composite foams, respectively. Compressing foams at 6.0 and 0.5 mm/min results in highest and lowest compressive stress, respectively. Insights from this study are useful in many areas such as environmental protection, pressure sensing, and energy where PDMS composite foams will find applications.

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46

Dabaghi, Mohammadhossein, Shadi Shahriari, Neda Saraei, Kevin Da, Abiram Chandiramohan, Ponnambalam Ravi Selvaganapathy, and Jeremy A. Hirota. "Surface Modification of PDMS-Based Microfluidic Devices with Collagen Using Polydopamine as a Spacer to Enhance Primary Human Bronchial Epithelial Cell Adhesion." Micromachines 12, no. 2 (January 26, 2021): 132. http://dx.doi.org/10.3390/mi12020132.

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Polydimethylsiloxane (PDMS) is a silicone-based synthetic material used in various biomedical applications due to its properties, including transparency, flexibility, permeability to gases, and ease of use. Though PDMS facilitates and assists the fabrication of complicated geometries at micro- and nano-scales, it does not optimally interact with cells for adherence and proliferation. Various strategies have been proposed to render PDMS to enhance cell attachment. The majority of these surface modification techniques have been offered for a static cell culture system. However, dynamic cell culture systems such as organ-on-a-chip devices are demanding platforms that recapitulate a living tissue microenvironment’s complexity. In organ-on-a-chip platforms, PDMS surfaces are usually coated by extracellular matrix (ECM) proteins, which occur as a result of a physical and weak bonding between PDMS and ECM proteins, and this binding can be degraded when it is exposed to shear stresses. This work reports static and dynamic coating methods to covalently bind collagen within a PDMS-based microfluidic device using polydopamine (PDA). These coating methods were evaluated using water contact angle measurement and atomic force microscopy (AFM) to optimize coating conditions. The biocompatibility of collagen-coated PDMS devices was assessed by culturing primary human bronchial epithelial cells (HBECs) in microfluidic devices. It was shown that both PDA coating methods could be used to bind collagen, thereby improving cell adhesion (approximately three times higher) without showing any discernible difference in cell attachment between these two methods. These results suggested that such a surface modification can help coat extracellular matrix protein onto PDMS-based microfluidic devices.

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47

S. Wahyuningsih, S.B. Rahardjo, E. Pramono, D. M. Widjonarko, A. H. Ramelan, W. W. Lestari, and F. N. Aini. "DEWATERING HYDROCARBON BASED ON SMART HYDROPHILIC SPONGE AND HYDROPHILIC GEL." RASAYAN Journal of Chemistry 15, no. 04 (2022): 2520–26. http://dx.doi.org/10.31788/rjc.2022.1546960.

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Sponge based on polydimethylsiloxane (PDMS) with a high-capacity, ZnCl2, Polyvinyl alcohol (PVA), and Polyethylene Glycol (PEG) for the dewatering application of hydrocarbon fuel sorbents has been prepared in one-step preparation. The synthesized hydrophilic sponges were named V1 (PDMS: ZnCl2), V2 (PDMS: ZnCl2: PVA), V3 (PDMS: ZnCl2: PEG), V4 (PDMS: ZnCl2: PVA: PEG), V5 (PDMS: 2ZnCl2: PVA: PEG) and V6 (PDMS: 3ZnCl2: PVA: PEG), respectively. The characteristics of the sponges under the optical microscope and contact angle measurements show the formation of hydrophilic sponge and gel. ATR-FTIR characterization showed peaks at 3100- 3500 cm-1 and 1750-1735 cm-1 identified with the OH stretching vibration and C=O strain vibration, which can be ascribed to the acetate group of the PVA molecule which is responsible for increasing the hydrophilicity. On the addition of PEG, there is an absorption band from the C-H vibration at 941 cm-1, and absorption at 1459, 1351, 1299, and 1256 cm-1 is CH, CH2, and CH3 bending vibrations. The contact angle measurements showed that the solid hydrophilic sponge V4 has a hydrophilic character (contact angle of 45.5º). And also, the increase in ZnCl2 was proportional to the decrease in contact angle. However, in the composition of V5 and V6, the super hydrophilic character (V5 =38.8º, V6 =14.3º) did not produce a good solid hydrophilic sponge. Characteristics of optical properties show high transmittance of more than 80%.

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48

Shakeri, Amid, Shadman Khan, and Tohid F. Didar. "Conventional and emerging strategies for the fabrication and functionalization of PDMS-based microfluidic devices." Lab on a Chip 21, no. 16 (2021): 3053–75. http://dx.doi.org/10.1039/d1lc00288k.

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The review paper presents a variety of methods for fabrication of PDMS-based microfluidic channels. Moreover, different strategies for tailoring the surface properties of PDMS microchannels and immobilization of biomolecules are discussed.

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49

Chen, Lung-Chien, Wen-Wei Lin, and Jun-Wei Chen. "Fabrication of GaN-Based White Light-Emitting Diodes on Yttrium Aluminum Garnet-Polydimethylsiloxane Flexible Substrates." Advances in Materials Science and Engineering 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/537163.

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This study concerns the characteristics of white GaN-based light-emitting diode (LED) on flexible substrates. The thin film GaN-based blue LEDs were directly transferred from sapphire onto the flexible polydimethylsiloxane (PDMS) substrates by laser lift-off (LLO) process. The PDMS substrates were incorporated 10–40% cerium doped yttrium aluminum garnet phosphor, YAG:Ce3+, and formed the GaN-based white LEDs. The white LEDs prepared by the GaN-based LEDs on the YAG-PDMS substrates reveal one peak at 470 nm corresponding to the emission of the GaN-based LED and a broadband included five weak peaks caused by YAG:Ce3+phosphors.

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50

Toto, Elisa, Susanna Laurenzi, and Maria Gabriella Santonicola. "Flexible Nanocomposites Based on Polydimethylsiloxane Matrices with DNA-Modified Graphene Filler: Curing Behavior by Differential Scanning Calorimetry." Polymers 12, no. 10 (October 8, 2020): 2301. http://dx.doi.org/10.3390/polym12102301.

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Novel silicone-based nanocomposites with varied elastic properties were prepared by blending standard polydimethylsiloxane (PDMS) with a lower viscosity component (hydroxyl-terminated PDMS) and integrating a graphene nanoplatelets (GNP) filler modified by strands of deoxyribonucleic acid (DNA). The curing behavior of these nanocomposites was studied by dynamic and isothermal differential scanning calorimetry. The activation energies of the polymerization reactions were determined using the Kissinger method and two model-free isoconversional approaches, the Ozawa–Flynn–Wall and the Kissinger–Akahira–Sunose methods. Results show that the complex trend of the curing behavior can be described using the isoconversional methods, unveiling lower activation energies for the nanocomposites with standard PDMS matrices. The role of the DNA modification of graphene on the curing behavior is also demonstrated. The curing reactions of the nanocomposites with the PDMS matrix are favored by the presence of the GNP–DNA filler. PDMS/PDMS–OH blends generate softer nanocomposites with hardness and reduced elastic modulus that can be tuned by varying the amount of the filler.

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