Nanotechnologies: a review of inventions and utility models. Part V

Abstract

The article provides an abstract review of patents. The results of creative activity of scientists, engineers and specialists, including inventions in the field of nanotechnology and nanomaterials, being implemented, allow achieving a significant effect in construction, housing and community services, and related sectors of the economy. For example, the invention «A method to produce dry construction mixtures» refers to manufacturing of building materials, in particularly, to manufacture of dry construction mixtures (DCM) by the method of joint mechanoactivation of cement and dolomite, with further modification of them with carbon nanostructures (CNT). The technical result of the given method of mixing CNT and main component of dry construction mixtures - cement – is that it makes possible to use microquantities (0.005%) of CNT in DCM. That allows decreasing product cost of obtained mixture. Moreover, due to increased strength, faster hardening of materials one can reduce consumption of these mixtures. That is additional factor affecting decrease of mixture product cost. The results obtained after application of mechanoactivation of basic mixture components were different practically by all indicators from the mixtures prepared by simple mixing. Compression strength and tensile strength increased by 10–15%, adhesion strength increased too. Along with increasing of strength characteristics such an important indicator of DCM as air permeability has decreased. Reduction of total volume of pores in dense structure of cement matrix caused dramatic slow-up of moisture diffusion rate. The specialists can also be interested in the following inventions in the area of nanotechnologies: a method of laser building-up welding for metal coatings, high RAP in WMA surface mixture containing nanoglass fibers, a device to apply nanoparticles of metal oxides on metal surface under normal conditions, multifunctional nanostructured additive for coatings, experimental assessment of cement mortar using nanooxide compounds, a composition for setting constructional layers of road pavements, a method to obtain composite films of nanofibers, nano-engineering of construction materials using molecular dynamics simulations, cast and self-compacting concrete mixture for cast-in-situ concrete and prefabricated reinforced units, a method to obtain photocatalyst based on nanotubular titanium dioxide et al

The effects of nano- and micro-sized additives on 3D printable cementitious and alkali-activated composites: a review

“…In contrary, when inert NMs are used, the effect of paste rheology is mainly attributed to the ultra-fine particle size and consequently, the competing effects between packing behaviour and interparticle forces (Wang et al 2014). NMs could be viable solutions to be incorporated into 3DPC as the production costs of nanoparticles has been significantly decreased over years with commercially available products dedicated for construction industry (Charitidis et al 2014;Jones et al 2019;Ivanov et al 2020).…”

Inventions in the area of nanomaterials and nanotechnologies. Part III

“…• A method of obtaining nanosize films of titanium nitride [18]. • A method to produce dry construction mixtures [19].…”

Evaluation of the effects of bismuth oxide (Bi2O3) micro and nanoparticles on the mechanical, microstructural and γ-ray/neutron shielding properties of Portland cement pastes

“…Nano-sized particles exhibit spectacular chemical and physical properties, when compared to their corresponding microsized materials as such, when added to cementitious composites, nanomaterials can effectively fill the voids in the cement matrix, acting as nucleating agents as well as exhibiting significant pozzolanic activity [42,43]. In addition, nanoparticles seems to be viable solution that can be incorporated as additives to cement-based composites and this is due the production costs of nanoparticles which has been significantly decreased over years with commercially available products dedicated for construction industry [44,45].…”