Multicomponent Micro Research Articles

Facile preparation of ZIF-8/ZIF-67-derived biomass carbon composites for highly efficient electromagnetic wave absorption

Biomass absorbing materials have received increasing attention for electromagnetic wave (EMW) absorption field absorbing materials due to its low density and high dielectric loss. However, the biomass EMW absorbing materials often suffer from the insufficient magnetic loss and impedance matching. In this work, a facile ZIF-8/ZIF-67-derived biomass composites (CoZnO@BPC) was prepared for high-performance EMW absorption based on multi-component micro, nano structures metal particles and xanthoce sorbifolia bunge shells-derived biomass porous carbon (BPC). The dielectric loss and/or magnetic loss abilities of CoZnO@BPC composites were adjusted by changing the mass ratio of Zn2+ to Co2+ ions. Under the filled amount of 20 wt%, CoZnO@BPC exhibited excellent EMW absorption with the minimum reflection loss (RL) at 15.84 GHz is -50.2 dB, and the matching thickness is only 1.7 mm. By adjusting the ZIFs mass ratio, the effective absorption bandwidth (EAB) can be up to 5.92 GHz (from 12.08 GHz to 18 GHz), and the matching thickness is only 1.9 mm. The results provide a new insight for the economical and efficient preparation of lightweight and advanced microwave absorbing materials.

Influence of mineral components on photosynthetic activity and productivity of cucumber plants “Monsoon F1”

In the conditions of the greenhouse of I.A.Bunin YSU, the influence of water-soluble multicomponent micronutrients - Green Lift, Nutrivant Plus - was studied Melon, Vitanol Micro on the physiological development of cucumber plants “Monsoon F1”. It was established that multicomponent micro fertilizers affect plant growth. The high efficiency of non-root fertilizing on growth processes in variants with the use of Green Lift was revealed. The smallest result was obtained between control and application Vitanol. The highest effect on the photosynthetic potential of plants from the applied fertilizers was obtained in the variant with the use of Vitanol.

ChemInform Abstract: Micro‐/Nanostructured Multicomponent Molecular Materials: Design, Assembly, and Functionality

AbstractReview: [73 refs.

Micro-/nanostructured multicomponent molecular materials: design, assembly, and functionality.

Molecule-based micro-/nanomaterials have attracted considerable attention because their properties can vary greatly from the corresponding macro-sized bulk systems. Recently, the construction of multicomponent molecular solids based on crystal engineering principles has emerged as a promising alternative way to develop micro-/nanomaterials. Unlike single-component materials, the resulting multicomponent systems offer the advantages of tunable composition, and adjustable molecular arrangement, and intermolecular interactions within their solid states. The study of these materials also supplies insight into how the crystal structure, molecular components, and micro-/nanoscale effects can influence the performance of molecular materials. In this review, we describe recent advances and current directions in the assembly and applications of crystalline multicomponent micro-/nanostructures. Firstly, the design strategies for multicomponent systems based on molecular recognition and crystal engineering principles are introduced. Attention is then focused on the methods of fabrication of low-dimensional multicomponent micro-/nanostructures. Their new applications are also outlined. Finally, we briefly discuss perspectives for the further development of these molecular crystalline micro-/nanomaterials.

Tribological properties of lubricants modified by complexes of hard micro- and nanoparticles

The results of study of the effect of multicomponent micro- and nanomodifiers for lubricants on the tribological performance of friction units are presented. It is shown that the presence of a complex of nanoadditives of β-sialon and carbon nanotubes is effective for the considerable diminishing of the friction coefficient and the growth of the loading capacity.

Hot embossing of thermoplastic multilayered stacks

The combination of different polymer materials during replication offers additional opportunities for fabrication and functionality of microsystems. Different surface and structural properties of polymers allow for improvements in microsystems for example by means of hydrophilic and hydrophobic combinations in microfluidic devices. Due to its high flexibility and precision hot embossing as one of the established micro replication processes facilitates processing of several polymer layers in one single process step. By this multi-component process micro structured systems consisting of thin layers of different polymers with adapted surface properties are fabricated. In this paper we describe the challenge of molding different types of polymers and some applications for multi-component micro systems.

Multiplexed Lipid Dip‐Pen Nanolithography on Subcellular Scales for the Templating of Functional Proteins and Cell Culture

Molecular patterning processes taking place in biological systems are challenging to study in vivo because of their dynamic behavior, subcellular size, and high degree of complexity. In vitro patterning of biomolecules using nanolithography allows simplification of the processes and detailed study of the dynamic interactions. Parallel dip-pen nanolithography (DPN) is uniquely capable of integrating functional biomolecules on subcellular length scales due to its constructive nature, high resolution, and high throughput. Phospholipids are particularly well suited as inks for DPN since a variety of different functional lipids can be readily patterned in parallel. Here DPN is used to spatially pattern multicomponent micro- and nanostructured supported lipid membranes and multilayers that are fluid and contain various amounts of biotin and/or nitrilotriacetic acid functional groups. The patterns are characterized by fluorescence microscopy and photoemission electron microscopy. Selective adsorption of functionalized or recombinant proteins based on streptavidin or histidine-tag coupling enables the semisynthetic fabrication of model peripheral membrane bound proteins. The biomimetic membrane patterns formed in this way are then used as substrates for cell culture, as demonstrated by the selective adhesion and activation of T-cells.

Fabrication method of two-level polymeric microstructure with the help of deep X-ray lithography

Two- or multi-level microstructures are getting more important in several applications such as multi-component micro optical elements and various microfluidic systems. In the present study, a simple and efficient method is newly proposed for a fabrication of the two-level polymeric microstructures. Making a mother two-level microstructure consists of two processes: (1) the hot embossing process for a fabrication of microstructures on a PMMA substrate, and (2) the deep X-ray lithography using the hot embossed substrate for a high aspect ratio microstructure fabrication, resulting in a high aspect ratio microstructure containing smaller microstructures on its surface. Making use of so fabricated two-level microstructures as a mother structure, one could achieve a mass replication of the same microstructures via injection molding process with a metallic mold insert obtained by a nickel electroforming onto the mother microstructure. In order to demonstrate the proposed method, a polymeric high aspect ratio microstructure having smaller square microstructures on its top surface was fabricated. The fabricated two-level microstructure shows fine vertical sidewalls, which is a characteristic feature of the deep X-ray lithography. In addition, a metallic mold insert for a mass replication was fabricated by a nickel electroforming process.

FABRICATION OF TRUE-COLOR MICROPATTERNS BY 2D STEPWISE CONTRACTION AND ADSORPTION NANOLITHOGRAPHY (SCAN)

Fabrication of structures on the micro- and nanometer scales is of great importance for both fundamental research and potential applications. While microlithography methods are relatively established, the production of multi-component micro- and nanostructures with high density still presents difficulties. In this paper, a novel strategy termed as two-dimensional (2D) stepwise contraction and adsorption nanolithography (SCAN) is used to fabricate true-color micropatterns through a series of size-reduction process based on the physical elasticity of elastomer. Faithful multicolor patterns with feature size about 30 times smaller than the initial ones can be fabricated by employing the 2D SCAN. The simplicity and high throughput capability of SCAN make it a competitive alternative to other micro- and nanolithography techniques.

Cover Picture: A Simple Miniaturization Protocol to Produce Multicomponent Micro‐ and Nanostructures (Small 7/2006)

The cover picture illustrates a new method of nanolithography, stepwise contraction and adsorption nanolithography (SCAN), that should in principle be able to extend the advantages of multicomponent microfabrication into smaller dimensions, as well as to reach the spatial precision afforded by scanning probe lithography. The left column depicts the balloon analogy of SCAN, in which the writing “small” on the balloon is miniaturized upon deflation. The right column presents a laser confocal micrograph of a two‐component array (red and green fluorescent dyes) generated after one and five SCAN cycles (top and bottom, respectively) in 2D reduction. Scale bars are 500 and 50 μm, respectively. For more information, please read the Communication “A Simple Miniaturization Protocol to Produce Multicomponent Micro‐ and Nanostructures” by G.‐y. Liu and co‐workers on page 884 ff.