聚二甲基硅氧烷

Abstract(#br)We present the application of a composite material, consisting of a ferromagnetic neodymium powder and a silicone elastomer, alone to realize a microfluidic network with pressure sensitive passive valves. The mixing ratio of the composite and the degree of magnetization can be utilized to adjust the switching point of each single valve. By combining differently adjusted valves within a microfluidic network it is possible to realize a sort of liquid logic and to control the flow in the network just by changing the inward flow respectively pressure.

Abstract(#br)The stretchable conducting films are fabricated by screen-printing method combined with polydimethylsiloxane (PDMS) infiltration. This film is a hybrid composite film formed by embedding carbon nanotubes in a PDMS matrix. The sheet resistance is measured with the tensile strain, and the film maintains electric conductivity at the strain up to 55%. The composite film is used as cathode to measure the field emission properties under varying stretching conditions, which is sensitive to the strain.

Abstract(#br)The inorganic–organic trilayer core–shell polysilsesquioxane/polyacrylate/polydimethylsiloxane hybrid latex particles have been successfully prepared via seeded emulsion polymerization of acrylate monomers and octamethylcyclotetrasiloxane (D 4 ) gradually, using functional polymethacryloxypropylsilsesquioxane (PSQ) latex particles with reactive methacryloxypropyl groups synthesized by the hydrolysis and polycondensation of (3-methacryloxypropyl)trimethoxysilane in the presence of mixed emulsifiers as seeds.

Abstract(#br)The ability to fabricate flexible filtration membranes that can selectively separate particles of different sizes is of considerable interest. In this article, we describe a facile, reproducible and simple one-step method to produce pores in polydimethylsiloxane (PDMS) membranes. We embedded micron-sized NaHCO 3 particles in 50\u003cce:hsp sp=\"0.25\"/\u003eμm thick PDMS films. After curing, the membranes were immersed in concentrated HCl acid. Pores were generated in the membrane by the evolution of CO 2 gas from the reaction of NaHCO 3 and HCl.

ˆ耀罸岠耇罸

Abstract(#br)Preparation of a high flux poly(dimethylsiloxane) (PDMS) membrane for separation of organics from water by pervaporation has been a challenging task. For this, the membrane should be as thin as possible since the productivity flux is inversely proportional to the membrane thickness. In an attempt to understand the relationship between the membrane structure and flux, the membranes of different thickness varying from about 0.2 to 150\u003cce:hsp sp=\"0.25\"/\u003eμm were prepared and studied.

Abstract(#br)Embryonic stem (ES) cells can undergo continual proliferation and differentiation into cells of all somatic cell lineages in vitro ; they are an unlimited cell source for regenerative medicine. However, techniques for maintaining undifferentiated ES cells are often inefficient and result in heterogeneous cell populations. Here, we determined effects of nanopattern polydimethylsiloxane (PDMS) as a culture substrate in promoting the self-renewal of mouse ES (mES) cells, compared to commercial plastic culture dishes.

Abstract(#br)In the oil and gas industry, silicon coming from antifoaming agents, is recognized to be an emergent contaminant for hydrotreatment catalyst due to its negative effect on their performance. Using a pilot plant, representative samples of the thermal degradation of antifoaming agent such as polydimethylsiloxanes (PDMS) were produced under evaluated thermal cracking of hydrocarbons with the presence or absence of steam. Micro size exclusion chromatography hyphenated to inductively coupled plasma high resolution mass spectrometry was used to characterize these samples.

Abstract(#br)Induced pluripotent stem cell-derived cardiomyocytes (iPSC-CM) have been widely proposed as in vitro models of myocardial physiology and disease. A significant obstacle, however, is their immature phenotype. We hypothesised that Ca 2+ cycling of iPSC-CM is influenced by culture conditions and can be manipulated to obtain a more mature cellular behaviour. To test this hypothesis we seeded iPSC-CM onto fibronectin coated microgrooved polydimethylsiloxane (PDMS) scaffolds fabricated using photolithography, or onto unstructured PDMS membrane.

Abstract(#br)A novel polydimethylsiloxane/liquid crystal cross-linked membrane (PDMS/LC) was prepared by using PDMS containing vinyl groups and LCs containing unsaturated linkages as matrix materials. Mechanical properties, liquid crystalline performance and blood compatibility of the PDMS/LC cross-linked membrane containing different LC contents and LC groups were investigated, respectively. The results showed that mechanical properties of the membrane increased more significantly than those of pure PDMS membranes.