THE POWER OF A SCANNING FORCE MICROSCOPE DOI: https://doi.org/10.22184/1993-8578.2022.15.2.140.143
The atomic force microscope has still another name – the scanning force microscope. When imaging with it, feedback must be used to control the interaction force between the probe and the sample. Generally, it must be kept at a minimum value so as not to deform the sample and probe during measurements. In contrast, in nanolithography and nanoindentation a large force must be applied to produce a clear pattern on the surface. In this paper we consider the forces that are generated and how much energy is expended when a typical defect in the form of a six-pointed star on graphite occurs.
VACUUM TWO-AXIS MOVEMENT MECHANISM WITH ELECTRORHEOLOGICAL SPEED CONTROL DOI: https://doi.org/10.22184/1993-8578.2022.15.2.144.148
In many areas of modern nanotechnologies carried out in a vacuum it is required to move objects with high precision. The paper considers a two-axis vacuum pneumohydraulic drive capable of performing precise movements. High precision of the mechanism is achieved due to use of intelligent material as a working fluid of the hydraulic part – an electrorheological fluid that can instantly change its rheological properties under the action of an external electric field. It has been experimentally established in the work that the most effective adjustment of the speed of the drive rod movement is carried out at low pressures in the pneumatic cylinder with a 25%concentration of the dispersed phase of the working fluid.
HOLOGRAPHIC NANOLENGTH METER WITH SLIDE BEARING DOI: https://doi.org/10.22184/1993-8578.2022.15.2.150.158
Humanity is currently attempting to exploit nanoscale objects. These cognitive processes concern all fields of activity, from intellectual to metrology, instrumentation, aerospace, robotics, and in all high-tech fields of engineering, science, including ecology. An important result of such processes, in particular, is the creation of the Russian holographic nano length meter with a sliding bearing with a record resolution of 10 nm and higher.
STRUCTURAL FEATURES AND MECHANICAL CHARACTERISTICS OF THE Ti49.4Ni50.6 ALLOY DURING THERMAL CYCLING IN THE RANGE OF MULTIPLE MARTENSITIC TRANSFORMATIONS DOI: https://doi.org/10.22184/1993-8578.2022.15.2.128.139
The paper considers the effect of thermal cycling in the martensitic transformation temperature range, as well as subsequent annealing, on the microstructure and mechanical characteristics of the Ti49.4Ni50.6 post-stoichiometric alloy. In the initial state, the structure is represented by almost dislocation-free austenite grains. After ECAP, an ultrafine-grained structure with equiaxed grains with an average size of 200 nm is formed. Thermal cycling of this alloy was carried out with the maximum number of thermal cycles n=100. As a result of the action of multiple martensitic transformations, an increase in the dislocation density, a slight change in the size of structural elements, and annealing lead to relaxation of defects and a change in the stoichiometric composition of the matrix are observed. Mechanical characteristics because of thermal cycling increase in all investigated states.
THE EFFECT OF THE SURFACE CHARGE OF ELECTRETS ON THE RESISTANCE TO FUNGI OF FLUOROCARBON POLYMER MATERIALS DOI: https://doi.org/10.22184/1993-8578.2022.15.2.106.113
This paper deals with the study of the resistance to fungi of the nanostructured fluorocarbon films produced on the surface of polymers, depending on the value of the surface charge. Apparently, the resistance to fungi of the film is affected not only by the surface charge but also by other surface characteristics, such as relief and chemical composition. The fluorocarbon films were formed under transient conditions using a two-component fluorocarbon gas mixture (CF4 + C6H12).
ELECTROFORMING OF SYNTHETIC FIBRES AND THEIR APPLICATIONS (OVERVIEW) DOI: https://doi.org/10.22184/1993-8578.2022.15.2.118.127
Electroforming is a versatile and flexible method for producing ultrathin fibers. Fibers produced by electroforming are used in many industries due to the high ratio of fiber length to its area. Electroforming has found especially great application in the production of filter materials based on ultrathin synthetic fibers.
THE WORDS AND GLORY OF PROBE MICROSCOPY: LANGUAGE WILL TAKE YOU TO BEIJING DOI: https://doi.org/10.22184/1993-8578.2022.15.2.88.94
In this paper we will not talk about the instruments, but about the language of the scanning probe microscopy software: the words used, the terms and the notation. The FemtoScan Online software is widely used in the scientific community and, until recently, was available in two languages: Russian and English. FemtoScan Online is now also available in Chinese, the most widely spoken language in the world. In this paper we will tell you how the interface was translated. In 1990, Nobel laureate Heinrich Rohrer visited Moscow State University. A photograph and memories of the charm of this remarkable scientist and man are left as a memento. There is also a dedicatory inscription "I wish all the best in local probing". In 1990 the term "scanning probe microscopy" or its Russian equivalent had not yet appeared. In 1993 a series of papers was published in the journal "Electronic Industry" where we described the methods of local surface sensing . The short triad "scanning probe microscopy" appeared later.
METHOD FOR ASSESSMENT OF THE CHIRALITY OF PROTEINS AND PHENYLALANINE NANOTUBES AS AN EFFECTIVE TOOL OF NANOBIOENGINEERING DOI: https://doi.org/10.22184/1993-8578.2022.15.2.96.104
The work is devoted to the consideration of regularities of spatial structure formation in proteins and their application in nanobioengineering. Methods for estimating the chirality of regular and irregular protein structure, as well as helical nanotubes based on phenylalanine are presented. The magnitude and the chirality sign of α-, 310-, and π-helices, β- and α-turns, Ω-loops, and right-handed and left-handed phenylalanine nanotubes have been calculated. The obtained results can be used to control the assembly of natural and artificial proteins.