Publications by authors named "Marian Matejdes"
To study the synergistic catalysis of an ex situ catalyst and in situ clay in the aquathermolysis of heavy oil, in this paper, a series of bentonite-supported catechol-metal complexes were prepared, and the catalytic viscosity reduction performance in the aquathermolysis of heavy oil was investigated. Under the optimized conditions, the viscosity can be reduced by 73%, and the pour point can be lowered by 15.0 °C at most, showing the synergistic catalysis of the ex situ catalyst and in situ clay in this aquathermolytic reaction.
View Article and Find Full Text PDFSolid-free drilling fluid has more advantages as a new type of drilling fluid compared with traditional drilling fluid, such as improving drilling efficiency, protecting oil and not having clay particles clog the oil and gas layer. In this study, Zn/Cu/Fe-doped magnesium-aluminum hydroxide (Mg-Al MMH) was prepared using the co-precipitation method and evaluated in solid-free drilling fluid. The inhibition mechanism of synthesized hydroxide was analyzed by X-ray diffraction, laser particle-size analysis and thermogravimetric analysis.
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- The orientation of transition dipoles in dye assemblies significantly affects the performance of optoelectronic devices like organic thin-film transistors and light-emitting diodes.
- A new fast and universal screening method with high spatial resolution is introduced to measure these orientations in large areas.
- The technique successfully identifies different chromophore orientations in dye monolayers and demonstrates a strong correlation between multiple optical transitions within the materials.
Article Synopsis
- * This study highlights an unusual osmotic swelling behavior of a synthetic vermiculite clay in water-DMSO mixtures, showing that swelling can occur under specific DMSO concentrations but becomes restricted again at higher levels.
- * The observed behaviors may be linked to the formation of different complexes of interlayer cations driven by composition changes, leading to increased basal spacing and favorable conditions for spontaneous clay dissolution.
Many creatures have the ability to traverse challenging environments by using their active muscles with anisotropic structures as the motors in a highly coordinated fashion. However, most artificial robots require multiple independently activated actuators to achieve similar purposes. Here we report a hydrogel-based, biomimetic soft robot capable of multimodal locomotion fueled and steered by light irradiation.
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