MARBON'S MARMIX® LATICES FOR CARPET OFFER A WIDE RANGE OF PROPERTIES, EXCELLENT STABILITY AND WATER RESISTANCE, IMPROVED AGING, FAST DRYING.

AbstractMajor challenges encountered when developing manganese-based materials for ozone decomposition are related to the low stability and water inactivation. To solve these problems, a hierarchical structure consisted of graphene encapsulating α-MnO2 nanofiber was developed. The optimized catalyst exhibited a stable ozone conversion efficiency of 80% and excellent stability over 100 h under a relative humidity (RH) of 20%. Even though the RH increased to 50%, the ozone conversion also reached 70%, well beyond the performance of α-MnO2 nanofiber. Here, surface graphite carbon was activated by capturing the electron from inner unsaturated Mn atoms. The excellent stability originated from the moderate local work function, which compromised the reaction barriers in the adsorption of ozone molecule and the desorption of the intermediate oxygen species. The hydrophobic graphene shells hindered the chemisorption of water vapour, consequently enhanced its water resistance. This work offered insights for catalyst design and would promote the practical application of manganese-based catalysts in ozone decomposition.

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Degradation of Oxytetracycline By Magnetic MOFs Heterojunction Photocatalyst With Persulfate : High Stability And Wide Range

10.21203/rs.3.rs-800618/v1 ◽

2021 ◽

Author(s):

Zhuo Zhang ◽

Chunyan Du ◽

Yin Zhang ◽

Guanlong Yu ◽

Ying Xiong ◽

...

Keyword(s):

Hydrothermal Method ◽

Removal Efficiency ◽

Organic Pollutants ◽

High Stability ◽

Water Bodies ◽

Significant Implication ◽

Ph Values ◽

Wide Range ◽

Excellent Stability

Abstract Photocatalysis/Persulfate is an effective method of degrading organic pollutants. In this study, Fe3O4/MIL-101(Fe), a magnetic heterojunction photocatalyst, was produced by hydrothermal method. The material exhibited excellent removal efficiency for OTC in the coupling of persulfate (87.1%, 1 h). And it has a wide range of applications, with good removal efficiency for OTC concentrations of 30 to 70 mg/L and pH values of 3 to 9. •SO4− and •OH played a major role in the OTC removal reaction and there was an Fe(III)/Fe(II) cycle during the reaction. With excellent stability and recoverability, the OTC removal efficiency decreased by only 4.29% after four cycles, and the Fe leaching did not exceed 0.035 mg/L per cycle. This has a significant implication for the removal of organic pollutants from water bodies.

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Effect of Technical Aerosil on the Properties of Adhesive Compositions

Lesnoy Zhurnal (Forestry Journal) ◽

10.37482/0536-1036-2021-3-133-144 ◽

2021 ◽

pp. 133-144

Author(s):

Ekaterina G. Sokolova ◽

◽

Dmitry S. Rusakov ◽

Galina S. Varankina ◽

Anatoly N. Chubinsky

Keyword(s):

Water Resistance ◽

Deep Structure ◽

Raw Materials ◽

Phenol Formaldehyde ◽

Physical Adsorption ◽

Urea Formaldehyde ◽

High Water ◽

Complex Compounds ◽

Adhesive Compositions ◽

Wide Range

The main drivers of competition among the products made with the use of adhesive compositions are the toxicity of finished products, the consumption of raw materials and energy resources, the duration of the main technological operations. These drivers can be controlled by using adhesives with different fillings and/or modifications. Adhesives based on phenol-formaldehyde and melamine-urea-formaldehyde resins are used to produce plywood with increased water resistance. Apart from resins, adhesives usually contain hardeners, fillers, and modifiers that affect the properties of the finished product. Technical aerosol is one of the modifiers of synthetic resins with a wide range of action. Aerosil is characterized by three types of interaction: physical adsorption, chemical adsorption (formation of hydrogen bridges by silanol groups), and chemical reactions on the surface layer. The chemical composition of aerosil was analyzed. Technical aluminum fluoride (AlF3) is of particular interest. It can interact with alkali metal fluorides with the formation of complex compounds that improve polymer structuring. The acids that make up aerosil reduce the pH to 2.0–3.5, so they can be catalysts for the curing process of melamine-urea-formaldehyde resins. The effect of technical aerosil on the properties of adhesive systems based on phenol-formaldehyde and melamine-ureaformaldehyde resins has been studied. Viscosity, curing time, and wetting ability of adhesive compositions were determined. The obtained results indicate the possibility of using this modifier in the composition of phenol-formaldehyde and melamine-urea-formaldehyde resins up to 15 pts. wt. The nature of the aerosil action on adhesive compositions was determined using IR spectroscopy. Analysis of the results showed that aerosil promotes deep structure formation of the polymer by increasing the molecular weight of the molecules. These bonds make it possible to form a more structured polymer with bound formaldehyde. Studies of the effect of aerosil on the properties of finished products were carried out. At the same time, an increase in performance indicators was found: the strength of adhesion increases, the toxicity of plywood decreases. The results of experiments on the effect of technical aerosil, taking into account the reduction of bonding time can be applied in the development of technological processes for obtaining plywood of high water resistance. For citation: Sokolova E.G., Rusakov D.S., Varankina G.S., Chubinsky A.N. Effect of Technical Aerosil on the Properties of Adhesive Compositions. Lesnoy Zhurnal [Russian Forestry Journal], 2021, no. 3, pp. 133–144. DOI: 10.37482/0536-1036-2021-3-133-144

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Application of New Materials for Red Mud Immobilization

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.854.182 ◽

2020 ◽

Vol 854 ◽

pp. 182-187

Author(s):

V.Yu. Piirainen ◽

A.A. Boeva ◽

T.Yu. Nikitina

Keyword(s):

Composite Material ◽

Red Mud ◽

Water Resistance ◽

New Materials ◽

Toxic Wastes ◽

Wide Range ◽

Increased Strength ◽

Positive Factor

The article analyses the application of a composite material based on magnesite cement and red mud for the production of high-resistant materials and structures. Technical characteristics are given proving that this composite has several advantages comparing with other materials and opens up new opportunities for the disposal of toxic wastes and developing new materials with unique characteristics. The advantage of this direction is that the composite material created on the basis of “red mud” has increased strength and water resistance; also, it has the structure of a homogeneous monolithic stone. A wide range of applications of neutralized waste is an undeniable positive factor.

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Potential of Electrospun Graphene Oxide-Gelatin Composite Nanofibers for Biomedical Applications

Materials Science Forum ◽

10.4028/www.scientific.net/msf.830-831.581 ◽

2015 ◽

Vol 830-831 ◽

pp. 581-584

Author(s):

K Jalaja ◽

R. James Nirmala

Keyword(s):

Graphene Oxide ◽

Polymer Matrix ◽

Biomedical Applications ◽

Composite Nanofibers ◽

Water Resistance ◽

Mechanical Performance ◽

Cross Linking ◽

Reinforcing Effect ◽

Wide Range ◽

Versatile Technique

Graphene oxide incorporated polymer matrix provides a multifunctional facet due to the reinforcing effect of graphene oxide (GO) with wide range of properties. Nanofibers are fabricated by a versatile technique known as electrospinning. The present study demonstrates the fabrication of gelatin, a protein nanofibers non-covalently functionalized with GO. The effect of GO on gelatin nanofibers in terms of mechanical performance is studied. In order to improve the water resistance of the resulting nanofibers, cross-linking is performed using dextran aldehyde.

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Water Stabilization of Clay Bricks with Improved Tannin and Iron Mixes

10.4028/www.scientific.net/cta.1.377 ◽

2022 ◽

Author(s):

Yi Du ◽

Coralie Brumaud ◽

Guillaume Habert

Keyword(s):

Yield Stress ◽

Water Resistance ◽

Reference Sample ◽

Iron Solubility ◽

Clay Bricks ◽

A Value ◽

Construction Techniques ◽

Wide Range ◽

Clay Materials ◽

Lower Carbon

Weak water resistance is a big obstacle for clay materials to overcome in modern construction industry. Compared to the hydraulic stabilized additives, bio-additives have a lower carbon footprint and have been used in many vernacular construction techniques to immobilize clay. In this work, the traditional recipes of tannin and iron have been revisited, in particular, the question of pH and iron solubility has been explored. Oak tannin and FeCl3 were chosen and their influence on the properties of clay materials in terms of rheological properties, compressive strength, and water resistance were characterized in the lab. Based on the results, tannin can reduce the yield stress of paste while with the addition of FeCl3, the yield stress of tannin dispersed pastes increased to a value similar to the reference sample but lower than the value contain only FeCl3. The increase was attributed to the complex reaction between tannin and Fe3+. The iron-tannin complexes can also increase the samples’ strength and water resistance. Although the complexes did not change the hydrophilic properties of the samples’ surface, they prevent the ingression of water. These results are very promising as they allow the production of a fluid earth material that is water-resistant. This opens a wide range of application potentials and can help to mainstream earth materials in construction.

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Tailoring Electrostatic Attraction Interactions to Activate Persistent Room Temperature Phosphorescence from Doped Polyacrylonitrile Films

10.26434/chemrxiv.13726474 ◽

2021 ◽

Author(s):

Hongzhuo Wu ◽

Deliang Wang ◽

zheng zhao ◽

Dong Wang ◽

Yu Xiong ◽

...

Keyword(s):

Polymer Matrix ◽

Room Temperature ◽

Theoretical Calculations ◽

Thermal Response ◽

Electrostatic Attraction ◽

Room Temperature Phosphorescence ◽

Donor And Acceptor ◽

Wide Range ◽

Organic Phosphor ◽

Excellent Stability

<p><a>Amorphous organic materials</a> exhibiting room temperature phosphorescence (RTP) are good candidates for optoelectronic and biomedical applications. In this proof-of-concept work, we present a rational strategy to activate persistent RTP with a wide range of color from doped films in which electron-rich organic phosphor as donor while electron-deficient polymer matrix as acceptor through electrostatic attraction interactions. By tailoring electrostatic attraction interactions between the donor and acceptor, an ultralong lifetime of 968.1 ms is achieved for doped film TBB-6OMe@PAN. Control experiments combined with theoretical calculations demonstrate that the electrostatic attraction interactions between organic phosphor and polymer matrix should be responsible for the persistent RTP of doped films. Besides, doped films show reversible thermal response and excellent stability in water, indicating an advantage of electrostatic attraction over hydrogen bond in terms of practical application.</p>

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Simplified, Shear Induced Generation of Double Emulsions for Robust Compartmentalization during Single Genome Analysis

10.1101/2021.11.22.469484 ◽

2021 ◽

Author(s):

Thomas W Cowell ◽

Andrew Dobria ◽

Hee-Sun Han

Keyword(s):

Double Emulsion ◽

Continuous Phase ◽

Single Step ◽

Rna Seq ◽

Single Genome ◽

Wide Range ◽

Multistep Reactions ◽

Downstream Analysis ◽

Virus Genomes ◽

Excellent Stability

Drop microfluidics has driven innovations for high throughput, low input analysis techniques such as single-cell RNA-seq. However, the instability of single emulsion (SE) drops occasionally causes significant merging during drop processing, limiting most applications to single-step reactions in drops. Here, we show that double emulsion (DE) drops address this critical limitation and completely prevent content mixing, which is essential for single entity analysis. DEs show excellent stability during thermal cycling. More importantly, DEs undergo rupture into the continuous phase instead of merging, preventing content mixing and eliminating unstable drops from the downstream analysis. Due to the lack of drop merging, the monodispersity of drops is maintained throughout a workflow, enabling the deterministic manipulation of drops downstream. We also developed a simple, one-layer fabrication method for DE drop makers. This design is powerful as it allows robust production of single-core DEs at a wide range of flow rates and better control over the shell thickness, both of which have been significant limitations of conventional two-layer devices. This approach makes the fabrication of DE devices much more accessible, facilitating its broader adoption. Finally, we show that DE droplets effectively maintain the compartmentalization of single virus genomes during PCR-based amplification and barcoding, while SEs mixed contents due to merging. With their resistance to content mixing, DE drops have key advantages for multistep reactions in drops, which is limited in SEs due to merging and content mixing.

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EASTERN STAINLESS TYPE 304

Alloy Digest ◽

10.31399/asm.ad.ss0413 ◽

1982 ◽

Vol 31 (9) ◽

Keyword(s):

Stainless Steel ◽

Cold Working ◽

High Strength ◽

Heat Treating ◽

Steel Company ◽

Annealed Condition ◽

Wide Range ◽

Shock Resistance ◽

Type 304 ◽

Excellent Stability

Abstract EASTERN STAINLESS Type 304 is the basic 18-8 chromium-nickel austenitic stainless steel. It is well suited for welding and is highly resistant to severe forms of corrosion. It combines high strength with excellent stability and shock resistance, even at cryogenic temperatures. It has good hot-working and cold-working characteristics and is non-magnetic in the annealed condition. Type 304 is used widely for machinery and equipment in a wide range of industries. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength as well as fracture toughness, creep, and fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: SS-413. Producer or source: Eastern Stainless Steel Company.

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UHB SVERKER 21

Alloy Digest ◽

10.31399/asm.ad.ts0356 ◽

1979 ◽

Vol 28 (11) ◽

Keyword(s):

Compressive Strength ◽

Cold Work ◽

High Surface ◽

Surface Hardness ◽

Heat Treating ◽

High Hardenability ◽

Wide Range ◽

Shock Resistance ◽

Cold Work Tool Steel ◽

Excellent Stability

Abstract UHB SVERKER 21 is a high-carbon, high-chromium cold-work tool steel alloyed with molybdenum and vanadium. It has high hardenability and high surface hardness after hardening. It has excellent wear resistance and high compressive strength along with moderate toughness (shock resistance). This steel also is characterized by excellent stability (safety) in hardening and good resistance to tempering. Its many applications include a wide range of cold-working dies, cold-heading tools, gages, knurling tools and shears. This datasheet provides information on composition, physical properties, hardness, elasticity, and compressive strength. It also includes information on heat treating and machining. Filing Code: TS-356. Producer or source: Uddeholm Steel Corporation.

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