scholarly journals Modification of powder epoxy compositions with highly dispersed magnesium oxide

2020 ◽  
Vol 56 (2) ◽  
pp. 220-228
Author(s):  
V. V. Komar ◽  
T. A. Pochodina ◽  
N. V. Kulinich ◽  
N. P. Krut’k ◽  
L. V. Ovseenko
Keyword(s):  
Low Temperature ◽  
Magnesium Oxide ◽  
Functional Properties ◽  
Protective Coatings ◽  
Polymer Network ◽  
Physicomechanical Properties ◽  
Polymerization Process ◽  
Highly Dispersed

The process of forming epoxy powder compositions with the participation of highly dispersed magnesium oxide in the preparation of compositions by extrusion mixing of components in the melt is investigated. It is established that highly dispersed MgO particles participate in the polymerization process and act as additional crosslinking units of defective regions of the polymer network, which improves the functional properties of epoxy powder compositions. Coatings based on modified compositions are characterized by high physicomechanical properties at low temperature curing (130 °С) and can be used to form protective coatings on heat-sensitive products.

Structural transformation and functional properties of vanadium oxide films after low-temperature annealing

2014 ◽  
Vol 564 ◽  
pp. 179-185 ◽  
Author(s):  
Yu. Goltvyanskyi ◽  
I. Khatsevych ◽  
A. Kuchuk ◽  
V. Kladko ◽  
V. Melnik ◽  
...  
Keyword(s):  
Low Temperature ◽  
Vanadium Oxide ◽  
Functional Properties ◽  
Structural Transformation ◽  
Oxide Films ◽  
Low Temperature Annealing ◽  
Vanadium Oxide Films

Synthesis and characterization of Au, Pt supported on graphene aerogel catalysts for CO oxidation at low temperature

2021 ◽  
Vol 11 (1) ◽  
pp. 118-122
Author(s):  
Chuyen Phan Thi ◽  
Hang Tran Thi Thanh ◽  
Phong Pham Nam ◽  
Ha Vu Thi Thu
Keyword(s):  
Low Temperature ◽  
Ambient Temperature ◽  
Co Oxidation ◽  
Pt Nanoparticles ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
Graphene Aerogel ◽  
Highly Dispersed ◽  
Average Size

Au, Pt supported on graphene aerogel catalysts (PtAu/rGOA) with molar ratio of Pt and Au of 1:1, and total metal concentration of 5 % were successfully synthesized by hydrothermal method.  The obtained catalysts were characterized by Raman, XRD, XPS, HR-TEM, BET. It revealed that Au and Pt nanoparticles with average size of 3 – 5 nm were highly dispersed on aerogel graphene. The activity of these catalysts was tested  in CO oxidation. The results showed that the conversion of CO at ambient temperature was 100% during 25 minutes. Accordingly, PtAu/rGOA could be considered as a potential catalysts for CO oxidation at low temperature.

The Preparation and Characterization of Highly Dispersed PdO over Alumina for Low?temperature Combustion of Methane

2004 ◽  
Vol 24 (3) ◽  
pp. 393-403 ◽  
Author(s):  
Kai?lu Yu ◽  
Chang?jun Liu ◽  
Yue?ping Zhang ◽  
Fei He ◽  
Xin?li Zhu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Low Temperature Combustion ◽  
Highly Dispersed ◽  
Temperature Combustion

scholarly journals Modification of water-suspension epoxy varnish and paint materials by nanostructured magnesium oxide

2020 ◽  
Vol 56 (1) ◽  
pp. 105-113
Author(s):  
V. V. Komar ◽  
T. A. Poсhodina ◽  
N. V. Kulinich ◽  
N. P. Krutko ◽  
L. V. .Ovseenko
Keyword(s):  
Magnesium Oxide ◽  
Protective Coatings ◽  
Curing Temperature ◽  
Aggregative Stability ◽  
Functional Surface ◽  
Properties Of Coatings ◽  
Mechanical Dispersion ◽  
Bead Mill ◽  
Powder Suspension ◽  
Size Of Particles

The process of modifying aqueous powder suspension materials (APS) based on solid epoxy film-forming agents with highly dispersed powders of magnesium oxide was studied: production by ChemPur (n-MgO – primary size of particles is 36 nm), and magnesium oxide synthesized by a template method from the concentrated bischofite solution (MgOlab – primary size of particles is 102.8 nm). It was shown that presence of active functional surface OHgroups in both samples of magnesium oxide leads to the formation of secondary structures: aggregates and agglomerates. The nature of the influence of the size of aggregates of MgO particles and the conditions of dispersion on the properties of protective coatings is established. The nature of the influence of particle size and dispersion conditions on the properties of protective coatings is established. Optimal properties of coatings based on APS, sedimentation and aggregative stability of suspensions are implemented only under the condition of effective mechanical dispersion in a bead mill, when the most intensive destruction of large aggregates of n-MgO up to 50–60 nm occurs. The distribution of nanoparticle agglomerates in APS at the micro level (700–800 nm) using the MgO-lab does not lead to a significant change in the properties of APS and coatings based on them.It is shown that the introduction of n-MgO into APS allows reduces the curing temperature of the coatings from 110 to 90–100 °С. It is caused by the increase in the density of cross-linking of the spatial structure of polymer. The strength of modified coatings upon impact and tension increases by 2 times in comparison with the base composition, which does not contain nanomodifier, during curing of coatings at100 °C. In comparison with the known water-borne epoxy paints and varnishes, APS compositions are one-pack, they are more technological in use, have a long lifetime (up to 12 months in comparison with the viability of known two-pack epoxies, 1-8 hours). Materials can be used in industry for the protection of metal products, both as primers and as independent coatings.

Highly dispersed and disordered nickel–iron layered hydroxides and sulphides: robust and high-activity water oxidation catalysts

2018 ◽  
Vol 2 (7) ◽  
pp. 1561-1573 ◽  
Author(s):  
Manjunath Chatti ◽  
Alexey M. Glushenkov ◽  
Thomas Gengenbach ◽  
Gregory P. Knowles ◽  
Tiago C. Mendes ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
High Activity ◽  
Water Oxidation ◽  
Microwave Assisted Synthesis ◽  
Oxidation Catalysts ◽  
Alkaline Water ◽  
Nickel Iron ◽  
Microwave Assisted ◽  
Highly Dispersed

A rapid low-temperature microwave-assisted synthesis of nickel(iron) layered hydroxides and sulphides that exhibit robust catalytic activity for electrooxidation of alkaline water is introduced.

Low-temperature catalytic oxidation of aniline to azoxybenzene over an Ag/Fe2O3 nanoparticle catalyst using H2O2 as an oxidant

2019 ◽  
Vol 43 (23) ◽  
pp. 8911-8918 ◽  
Author(s):  
Bappi Paul ◽  
Sachin K. Sharma ◽  
Shubhadeep Adak ◽  
Rubina Khatun ◽  
Gurmeet Singh ◽  
...  
Keyword(s):  
Low Temperature ◽  
Catalytic Oxidation ◽  
One Pot ◽  
Efficient Catalyst ◽  
Highly Dispersed ◽  
Fe2o3 Nanoparticle ◽  
Nanoparticle Catalyst

Highly dispersed Ag-supported α-Fe2O3 is found to be a recyclable and efficient catalyst for one-pot conversion of aniline to azoxybenzene.

scholarly journals Tunable preparation of highly dispersed NixMn-LDO catalysts derived from NixMn-LDHs precursors and application in low-temperature NH3-SCR reactions

RSC Advances ◽  
2019 ◽  
Vol 9 (42) ◽  
pp. 24377-24385 ◽  
Author(s):  
Benhui Hou ◽  
Yali Du ◽  
Xuezhen Liu ◽  
Chao Ci ◽  
Xu Wu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Uniform Distribution ◽  
Active Species ◽  
Nh3 Scr ◽  
Highly Dispersed

The NixMn-LDO catalysts derived from NixMn-LDHs precursors with uniform distribution of active species particles exhibited outstanding DeNOx performance.

Facile in situ Encapsulation of Highly Dispersed Ni@MCM-41 for the Trans-Decalin Production from Hydrogenation of Naphthalene at Low Temperature

ChemCatChem ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 1286-1294 ◽  
Author(s):  
Xiaoyun Song ◽  
Qingxin Guan ◽  
Yu Shu ◽  
Xiaojing Zhang ◽  
Wei Li
Keyword(s):  
Low Temperature ◽  
Highly Dispersed ◽  
Mcm 41
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