Morphological Structure Research Articles

Preparation, characterization, and catalytic performance comparison of Ni/LaBO3 and Ru‐Ni/LaBO3 (B = Al, Fe) for methane steam reforming to hydrogen production

AbstractThe methane steam reforming (MSR) reaction is a significant process for hydrogen production, and developing catalysts with high activity and stability is crucial. In this work, the supported perovskite catalysts of Ni/LaBO3 and Ru‐Ni/LaBO3 (B = Al, Fe) were prepared by the sol–gel method using citric acid as a gelling agent for MSR to hydrogen production. The phase composition, pore structure, and surface morphology of the prepared catalysts were characterized by X‐ray diffractometer, Brunauer–Emett–Teller, scanning electron microscopy and energy dispersive spectroscopy, and X‐ray photoelectron spectroscopy. The reaction activity and stability of the prepared catalysts were tested in the fixed‐bed reactor with the temperature range of 500–800°C. The effect of Ru addition on the structure of perovskite and catalytic performance of MSR is explored. The results showed that 1wt%Ru–15wt%Ni/LaAlO3 catalyst exhibited the most excellent activity and stability during the reaction compared with the other three catalysts. The CH4 conversion, H2 selectivity, and H2 yield of the 1wt%Ru–15wt%Ni/LaAlO3 catalyst could reach 94.68%, 79.78%, and 48.65%, respectively, under the reaction temperature of 800°C and gas hourly space velocity of 36 000 mL/(gh), which were higher than those of a commercial catalyst. It was because that the relatively large surface area of perovskite support provides more active site and the addition of Ru enable Ni to have a smaller size and more dispersion. This study could provide a reference of perovskite catalysts for hydrogen production by MSR.

Synthesis and characterization of boiled linseed oil integrated with and without reduced graphene oxide nanosheets blended microcapsules

Abstract The synthesis and characterization of reduced graphene oxide, boiled linseed oil(BLO), and reduced graphene oxide(rGO)—boiled linseed oil microcapsules (BLO-rGO MCs) are effectuated. The synthesis of reduced graphene oxide involved the reduction of graphene oxide using a reducing agent, resulting in the formation of reduced graphene oxide sheets with a high degree of reduction. Characterization techniques such as XRD and FTIR confirmed the successful reduction of graphene oxide to reduced graphene oxide. Boiled linseed oil was characterized using FTIR and SEM techniques, which revealed the molecular structure and surface morphology of the BLO. These microcapsules were synthesized using a simple and scalable method that involves the encapsulation of reduced graphene oxide and boiled linseed oil within a protective shell. The microcapsules were characterized using various techniques such as SEM, FTIR, and XRD, which evidently demonstrated the successful encapsulation of reduced graphene oxide and boiled linseed oil as microcapsules. The combination of reduced graphene oxide and boiled linseed oil as microcapsules offers unique properties such as improved stability, controlled release, as well as increased functionality. These microcapsules have potential applications in numerous fields such as coatings, composites, and drug delivery. The overall output of this study demonstrates the high possibility for the development of novel materials with unique properties and potential applications in numerous fields via the synthesis and characterization of reduced graphene oxide, boiled linseed oil, and reduced graphene oxide-boiled linseed oil microcapsules.

Synthesis of novel Ag-doped ZnFe based-oxides nanocomposite for wastewater treatment, self-cleaning, and corrosion resistance

To tackle the critical environmental and industrial challenges, this research endeavors to develop nanomaterial with enhanced photocatalytic function, corrosion resistance, self-cleaning capabilities, and optimal effluent treatment. This research successfully synthesized Ag@ZnFe2O4 nanocomposite to activate peroxymonosulfate (PMS) for the removal of Congo red from water. The structural composition and morphology of the materials were examined by the utilization of XRD, FTIR, XPS, SEM with EDS and TEM. The study examined the impacts of catalyst dosage, concentrations of PMS, pH, and simultaneous ions on the experiment, as well as the ability of the nanocomposites to be reused and their stability. The photocatalytic degradation process was hypothesized to operate using free radical trapping tests. Results indicated that the heterostructure junction flanked by ZnFe2O4 nanoparticles and Ag promoted charge transfer, reducing electron-hole recombination. By adding 5mg of Ag@ZnFe₂O₄ nanocomposite, Congo red degradation was optimized at 98.7% due to the huge surface area of Ag microflowers, which boosted active sites and CR elimination. Due to nanoparticle surface charge, PMS speciation, and radical interactions, CR degradation was most efficient at pH 7.3 and less efficient at pH 9.5. CR degradation rates rose with PMS concentration, reaching 34.7%, 67.9%, and 97.9% at 0.3, 0.6, and 1mM, respectively. The order of the inhibitory action was CO32− > H2PO4− > Cl− > NO3−. Free radical entrapment experiments show that hydroxyl (•OH) and sulfate radicals (•SO₄⁻) are key in CR photodegradation, with h+ and •O₂ being the main active species. ESR tests revealed radicals, while electron transfer between ZnFe₂O₄ and Ag boosted carrier migration, driving redox cycles and CR breakdown into stable byproducts like CO₂ and H₂O. Light-induced reaction eliminated 45.8% of TOC, indicating CR partial mineralization. Mechanism of PMS-based photodegradation of CR removal was proposed. This study underscores the promising potential of Ag@ZnFe2O4/nanocomposites for PMS activation in degrading Congo red-contaminated wastewater. Electrochemical impedance spectroscopy (EIS) showed that a polymeric nanocomposite coating greatly improves the ability to resist corrosion in steel substrates when exposed to a 3.5% NaCl solution. This is achieved by reducing the corrosion current density and boosting corrosion resistance. Superhydrophobic nanocomposite coatings repel water and pollutants, safeguarding various substrates from soil residues.

Enhancing marine protection: Antibacterial, anti-corrosion, and wettability properties of smart coatings via magnet assisted jet electrodeposition

Marine biofouling poses significant challenges to marine infrastructure. Current marine antifouling coatings face issues such as long-term stability, non-toxicity, and cost-effectiveness. This study investigates the preparation of smart coatings using nano-ZrO2/Ni composite materials via magnet assisted jet electrodeposition, varying the concentration of ZrO2 nanoparticles. The coatings’ structure and surface morphology were analyzed, and their antibacterial, anti-corrosion, and wettability properties evaluated. The results showed that the smart coatings were hydrophobic and could generate reactive oxygen species radicals, and the use of magnetic field preparation also resulted in a microscopic raised structures on the surface, with an antibacterial effect that exceeded that of pure nickel coatings. Increasing the concentration of ZrO2 nanoparticles enhanced coating density and significantly improved anti-corrosion properties. The composition distribution of Zr was the most homogeneous when the mass concentration of ZrO2 nanoparticles was 4 g/L. The development of smart coatings presents promising potential for combating marine biofouling, offering enhanced protection and application prospects in marine environments.

Effect of alloying elements on coexisting phases and microstructure of M174 heat-resistant aluminum alloy

Abstract This article mainly focuses on high-power density diesel engine piston alloys, with the main component system being M174 heat-resistant aluminum alloy. On this basis, the main heat-resistant alloying elements Cu, Ni, and Fe were optimized and designed. This article is based on Thermo-Calc thermodynamic software, and comprehensively calculates and analyzes the multi-component alloy equilibrium phase diagram and Scheil non-equilibrium solidification of Al-(4-6)Cu-(1.5-3)Ni-(0.7-1.1Fe)-12.5Si-0.85Mg (mt.%) heat-resistant aluminum alloy system. Through the orthogonal experimental method of alloy composition, the phase distribution and microstructure composition of different alloy compositions are obtained. Research has found that Fe-rich phases such as Al5FeSi and Al9FeNi, as well as Ni-rich phases such as A13CuNi, A17Cu4Ni, and Al3Ni, are the main heat-resistant phases of the alloy in the temperature range of 350°C-420°C, providing important support for the high-temperature mechanical properties and creep damage resistance of piston aluminum alloy. At the same time, this article further studies the solidification history and microstructure precipitation of alloys. Fe-rich heat-resistant phases such as Al5FeSi and Al9FeNi have a higher solidification sequence. As primary and secondary phases, it is easy to generate coarse solidified structures. The organizational content is sensitive to the alloy composition. A13CuNi and A17Cu4Ni mainly precipitate in a multi-component eutectic structure, with layered and petal-shaped morphologies. The research results of this article have important theoretical significance and application value for the optimization design of high-power density piston aluminum alloy composition and the coordinated control of multi-phase structure.

Biomimetic Channels Design in Metal-Organic Framework Enabling Highly Lithium-Ion Conduction for Lithium-Metal Batteries.

Solid-state electrolytes (SSEs) based on metal-organic frameworks (MOFs) are an ideal material for constructing high-performance lithium metal batteries (LMBs). However, the low ion conductivity and poor interface contact (especially at low temperatures) still seriously hinder its further application. Herein, inspired by the Na+/K+ conduction in biology systems, a series (NH2, OH, NH-(CH2)3-SO3H)-modified MIL-53-X as SSEs is reported. These functional groups are similar to anions suspended in biological ion channels, partially repelling anions while allowing cations to be effectively transported through pore channels. Subsequently, MIL-53-X with hierarchical pore structure (H-MIL-53-X) is obtained by introducing lauric acid as a regulator, and then the effects of structural design and morphology control on its performance are explored. The conductivity of H-MIL-53-NH-SO3Li with multi-level pore structure and modified by sulfonic acid groups reached 2.2×10-3Scm-1 at 25°C, lithium-ion transference number of 0.78. Besides, the H-MIL-53-NH-SO3Li still has an excellent conductivity of 10-4Scm-1 at -40°C. Additionally, LiFePO4/Li batteries equipped with H-MIL-53-NH-SO3Li SSEs could operate stably for over 200 cycles at 0.1C. The strategy of combining structural and morphological design of MOFs with biomimetic ion channels opens new avenues for the design of high-performance SSEs.

Differences Photopolymerizations and Characterizations of Monomers Liquid Crystal between Mesogen Reactive RM 257 and Cholesteryl Acrylate using method of UV Curing

Abstract Mesogen reactive RM257 and cholesteryl acrylate are two types of liquid crystal with the characteristic property of possesing polymerizable groups. Cholesteryl acrylate has interesting properties that can form a helical spiral structure. Previous research in maintaining the helical structure has not been maximized. In this study, we will explain how the UV curing process is a way to fix the helical structure. Monomer phase of cholesteryl acrylate only appears at mesophase temperature, in order to maintain the helical structure of the cholesterl acrylic compound is polymerized. Mesogen reactive RM257 is monomer liquid crystal that acrylate functions as back bone polymer chain. Cholesteryl acrylate and RM257 each monomers is polymerized using UV light with 55 watt of wavelength which has 365 nm. The polymerization process produces a new functional group formed by C-O esters at wave numbers 1047 cm−1 and 1055 cm−1. XRD diffraction pattern showed peaks at 2θ in 7.5°,15°, and 20°. Photo SEM image showed crosslinked morphology structure. Based on the results of this study, it is hoped that the polymer RM257 and acrylate coliform can be smart materials for sensor applications and further technological material composites.

Co-option of the trichome-forming network initiated the evolution of a morphological novelty in Drosophila eugracilis.

Identifying the molecular origins by which new morphological structures evolve is one of the long-standing problems in evolutionary biology. To date, vanishingly few examples provide a compelling account of how new morphologies were initially formed, thereby limiting our understanding of how diverse forms of life derived their complex features. Here, we provide evidence that the large projections on the Drosophila eugracilis phallus that are implicated in sexual conflict have evolved through the partial co-option of the trichome genetic network. These unicellular apical projections on the phallus postgonal sheath are reminiscent of trichomes that cover the Drosophila body but are up to 20-fold larger in size. During their development, they express the transcription factor Shavenbaby, the master regulator of the trichome network. Consistent with the co-option of the Shavenbaby network during the evolution of the D.eugracilis projections, somatic mosaic CRISPR-Cas9 mutagenesis shows that shavenbaby is necessary for their proper length. Moreover, misexpression of Shavenbaby in the sheath of D.melanogaster, a naive species that lacks these projections, is sufficient to induce small trichomes. These induced projections rely on a genetic network that is shared to a large extent with the D.eugracilis projections, indicating its partial co-option but also some genetic rewiring. Thus, by leveraging a genetically tractable evolutionary novelty, our work shows that the trichome-forming network is flexible enough that it can be partially co-opted in a new context and subsequently refined to produce unique apical projections that are barely recognizable compared with their simpler ancestral beginnings.

Monodispersed Cu sites assembled on ultrathin 2D C3N4 for efficient electrocatalytic CO2 methanation

Electrocatalytic CO2 reduction (ECO2R) to methane is a promising technology that could effectively realize carbon resource integration and energy recycling. Currently, Cu-based catalysts are the most effective catalysts for this process, and a long-term goal of high selectivity and high stability still remains elusive. In this study, a controllable and multistep solid-state pyrolysis route is implemented to successfully introduce atomically dispersed Cu sites (Cu SA) into the two-dimensional carbon nitride (2D C3N4) matrices. The active site density and morphology structure of the Cu SA-2D C3N4 catalyst could be precisely controlled by adjusting the calcination process. Through the strategic combination of an ultrathin 2D structure and uniformly dispersed active sites, the Cu SA-2D C3N4 maximizes the exposure of active sites while suppressing competitive C–C coupling reactions. Ultimately, the optimized Cu SA-2D C3N4-30 exhibit a Faradaic efficiency of 62.9 % for CO2-to-CH4 conversion with a partial current density of 172.4 mA cm−2 at -1.68 V vs. RHE. This work demonstrates an advanced Cu-based electrocatalyst that effectively improves the performance of electrocatalytic CO2 methanation.

Electrochemical non-enzymatic glucose biosensors based on Au-thiol-linked molecular architectures

In this work, an electrochemical non-enzymatic glucose sensor consisting of di-methanethiol-grafted poly (3,4-propylenedioxythiophene), gold nanoparticles (Au NPs), and reduced graphene oxide (rGO) was synthesized by a one-step method through Au-S chemisorption. The structure and morphology of the as-prepared poly (ProDOT-(MeSH)2)/Au/rGO composite were characterized by FT-IR, XRD, EDX, TEM, SEM, and XPS, and the electrochemical performance of the composite was investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) on glassy carbon electrode (GCE). The results show that because of the hydrogen bond interaction between the thiol group on the polymer units and the functional groups on GO, poly (ProDOT-(MeSH)2)/Au/rGO was successfully prepared. In addition, due to the unique morphological structure of the composite and the ability to absorb glucose molecules through hydrogen bonds, the poly(ProDOT-(MeSH)2)/Au/rGO electrode possesses excellent selectivity and unique sensitivity (46.13 μA mM−1 cm−2) for sensing glucose in the linear range of 0.04–16.0 mM with a detection limit of (S/N = 3) 0.01. This paper demonstrates that the poly(ProDOT-(MeSH)2)/Au/rGO composite holds great promise for application as a new glucose sensor in life science.

Evaluation of the properties of high-content degraded crumb rubber–modified asphalt under thermal oxidation and weathering aging

In this study, the properties of high-content degraded crumb rubber–modified asphalt (HCDRA) under thermal oxidation and weathering aging were analyzed by the fluorescence microscopy test, temperature sweep test, zero shear viscosity test, attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) test, and gel permeation chromatography (GPC) test. Morphological structure result shows that after various degrees of thermal oxidation and weathering aging, the number and size of crumb rubber (CR) particles in HCDRA became smaller. Besides, with the deepening of the degree of oxidization, the rutting resistance of HCDRA decreases firstly and then increases. The improvement of the anti-aging and temperature sensitivity of HCDRA is better than that of neat asphalt and 20 % content CR-modified asphalt. Moreover, thermal oxidation and weathering aging make HCDRA more sensitive to temperature, and the temperature sensitivity of HCDRA is more affected by long-term aging relative to neat asphalt and 20 % content CR-modified asphalt. ATR-FTIR test and GPC test show that the complex modulus of HCDRA increases with the increase of carbonyl groups after aging, and HCDRA becomes soft and then hard during the aging process with the increase of macromolecule polymer content. Lastly, cluster analysis and principal component analysis reveal that the degree of asphalt oxidation has a strong influence on failure temperature and zero shear viscosity, and small molecule polymer has a significant effect on the temperature sensitivity of rheological properties.

Hydrothermal carbonization of woody waste: Changes in the physicochemical properties and the structural evolution mechanisms of hydrochar during this process

The Chinese medicine residue (CMR) is composed of wet woody waste, including licorice and ephedra, so using hydrothermal carbonization (HTC) to recover renewable energy from the CMR is a suitable treatment method. An in-depth analysis of the physicochemical properties and structural evolution mechanism of hydrochars is helpful in fundamentally promoting the energy utilization of traditional Chinese medicine waste residue. Therefore, this study analyzed the physicochemical properties and morphological structure of hydrochar produced under varying HTC conditions using multiple testing methods. The evolution of the hydrochar's structural characteristics can be categorized into three stages: component decomposition, structural rearrangement, and carbonization. During the component decomposition and carbonization stages, numerous nanoscale micropores form within the hydrochar. These micropores' specific surface area and pore volume can reach up to 113.420 m2/g and 0.01913 cm3/g, respectively. The highest fractal dimension values for D1 and D2 are 2.6354 and 2.5565, while the maximum values for the microcrystalline stacking height (Lc) and the average number of crystalline layers (Nave) are 0.3354 and 1.9968, respectively. Consequently, the hydrochar produced during these stages exhibits a rougher pore surface and a more complex structure, making it more suitable for adsorbing heavy metals from soil and sequestering CO2. During the structural rearrangement stage, the hydrochar exhibits higher contents of fixed carbon (FC), MgO, P2O5, and a higher C/N atomic ratio, with maximum values of 38.51%, 0.99%, 1.12%, and 28.49, respectively. Thus, the hydrochar produced during this stage is more suitable for soil remediation and nutrient recovery.

A stimuli-responsive keratin functionalized PEI coated baicalin nano-hydrogels for modulated gastric ulcer therapy

Nano-hydrogel system conjugated with polymer like polyethylieneimine offers a significant attention in the field of healthcare owing to their significant pH-specific swelling behaviour in acidic medium. The focus of this research work was to fabricate a stable and non-toxic, keratin-PEI coated nano-hydrogel formulation exhibiting synergistic effect for gastric ulcer treatment. K-PEI-BL nano-hydrogel shows particle size ~500nm with polydispersity index 0.473 ± 0.04, zeta potential of 15.4 ± 6.06mV, entrapment efficiency of 91.94 ± 0.04% and in vitro controled release of 72.78 ± 0.52% for 24h in pH 1.2. Scanning electron miscroscopy (SEM), Transmission electron microscopy (TEM) images confirmed the morphological structure of double coated nano-hydrogel particle. Ex-vivo mucoadhesive study of keratin-PEI coated-BA-NH formulation at gastric ulcer site exhibited 21h and 15min as a residence time in comparison to uncoated BA-NH formulation. In-vivo analysis displayed improvenent in ulcer treatment compared to negative control group with 86.46% and 71.86% inhibition of ulcer in standard ranitidine and K-PEI-BL nano-hydrogel treatment groups, respectively. This research study concluded that K-PEI-BL nano-hydrogel formulation with 15mg/kg dose exhibited anti-ulcer actions by reducing the severity of gastric abrasions.

Fabrication of highly flexible biopolymeric chitosan/agarose based bioscaffold with Matricaria recutita herbal extract for antimicrobial wound dressing applications

A flexible biopolymer-based antimicrobial wound dressing has the potential to alleviate the burden of bacterial infections in wounds by enhancing antimicrobial effectiveness and promoting faster wound healing. This study focuses on the development of a highly flexible chitosan-agarose (CS-AG) bioscaffold, incorporating Matricaria recutita chamomile flower extract (CH) through a conventional casting method. The flexible CS-AG bioscaffold's physiochemical properties were confirmed by FTIR, indicating secondary interactions, and XRD, showing its crystalline structure. The addition of CH to the optimized CS-AG bioscaffold resulted in significant tensile strength (17.28 ± 0.33 MPa), distinctive structural morphology (SEM), surface roughness (AFM), contact angle, improved thermal properties (DSC), and enhanced thermal stability (TGA). Furthermore, the CH-infused bioscaffold significantly increased swelling capacity (~81.09 ± 1.74 % over 48 h), and degradation profile (~52 % over 180 h). The release studies of CS-AG-CH bioscaffold demonstrate controlled release of CH with in the bioscaffold at different pH conditions. The bioscaffold demonstrated effective antibacterial activity against S. aureus and E. coli strains. Additionally, cytotoxicity assays indicated that the bioscaffold supports better cell viability and proliferation in fibroblast (NIH 3T3) cell lines. Consequently, this antimicrobial bioscaffold shows promise as a drug release system and biocompatible wound dressing suitable for tissue engineering applications.

Release kinetics and protective effect of novel curcumin-based nanoliposome modified with pectin, whey protein isolates and hyaluronic acid against oxidative stress

In the present study, a novel nanoliposome loaded with Curcumin (Cur) (NNLs-Cur) was established to overcome the gastrointestinal digestive barrier and enhance mitochondrial targeting capacity, exerting the antioxidant capacity of Cur. Noteworthy, NNLs-Cur was modified by pectin, whey protein isolates and hyaluronic acid. The results showed that the structure of traditional nanoliposomes loaded with Cur (NLs-Cur) was destroyed during digestion. However, NNLs-Cur maintained intact structural morphology, and the release of Cur in the stomach and intestines was consistent with zero-order and first-order kinetic models, respectively. Interestingly, the survival rate of HL-7702 cells after being damaged by H2O2 was 40.53 %, while the survival rate after treated with NNLs-Cur reached 99.87 %. Besides, the fluorescence localization indicated Cur in NNLs-Cur could escape lysosomal and achieve mitochondria targeting. Compared with NLs-Cur, the damaged cells treated with NNLs-Cur increased activities of catalase (CAT), glutathione peroxide (GSH-Px) and superoxide dismutase (SOD) from 16.16 ± 0.52, 16.92 ± 2.28 and 30.10 ± 0.93 U/mgprot to 19.09 ± 0.52, 20.41 ± 1.79 and 33.81 ± 0.29 U/mgprot, respectively. Malondialdehyde (MDA) content and reactive oxygen species (ROS) level of the oxidative damaged cells were reduced, mitochondrial membrane potential was restored, and cell apoptosis was reduced. This study provides theoretical guidance for realizing the industrial application of efficient targeted delivery Cur.

Predicting this rock: Listeners use redundant phonetic information in online morphosyntactic processing

Pronunciation variation is systematic, and provides listeners with cues to what the speaker is about to say. Shortened stems, for example, can indicate an upcoming suffix, while lengthened ones can indicate a word boundary follows. Previous work has shown that listeners draw on these cues to distinguish polysyllabic words, like rocket, from monosyllabic words, like rock. This strategy is useful in morphological processing, as additional morphological structure often adds additional syllables. The current study asks (i) whether listeners use these cues to distinguish words that differ only in morphological structure with no change in syllable count (e.g., rock/rocks); and (ii) how surrounding morphosyntactic context affects listeners’ ability to use these cues. Ideal observer models predict that listeners should be attentive to phonetic detail in all contexts regardless of how much new information it offers, while the strategic listener account allows listeners to dynamically adjust their attentiveness to phonetic detail based on its information value in context. In a visual-world eye-tracking study, English-speaking listeners were presented with utterances containing target nouns whose stem durations were manipulated to provide cues to the presence or absence of (a) a plural suffix (rock vs. rocks) or (b) a second, non-morphological syllable (rock vs. rocket). These words were embedded in two contexts: (i) preceded by agreeing determiners, which rendered stem duration cues redundant for predicting the presence or absence of a suffix (this rock/these rocks), and (ii) preceded by non-agreeing determiners (the rock(s)), where stem duration cues carried more information. The results are consistent with ideal observer models: listeners are highly attentive to all acoustic detail, and especially so when it is predictable (and hence redundant), as long as they have the cognitive resources to handle it.

Improvement of direct microscopy method for differential diagnosis of skin mycoses

Background and Aim.In the practice of veterinary doctors, a number of methods for diagnosing dermatomycoses are used, methods of direct and luminescent microscopy are undeservedly ignored. Сomparative analysis of staining methods for improving the method of direct microscopy, rapid and reliable detection of spores and mycelium in biomaterial, identification of pathogens and differential diagnosis of skin mycoses is of crucial importance for the effective treatment of animalsMaterials and Methods. 47 clinical samples of wool and skin taken from farm animals were examined for dermatomycetes. Diagnosis was performed using direct microscopy, fluorescence microscopy with calcofluor, and culture medium culture Saburo. Results. During the study of 47 samples of biological material, it was found that during microscopy the pathogen was detected in 10 cases (21.3%), during KOH microscopy - in 15 cases (29.9%), during KOH microscopy with other dyes in 11 cases (23.4%), during KOH microscopy with color calcofluor in 25 cases (53.2%). The efficiency of the KOH microscopy method with white calcofluor in comparison with direct microscopy was 60% higher, in comparison with KOH microscopy with other dyes - by 56%, classical KOH microscopy by 43.8%. By the culture method, pathogens were detected in 28 cases (59.6%), of which 7 Trichophyton spp., 1 Microsporum spp., 14 Aspergillius spp., 6 yeast. Growth was absent in 19 samples (40.4%), bacteria were detected in 3 samples (6.3%). In comparison with КOH microscopy with calcofluor white, positive results were confirmed in 89.3%.Conclusion. The use of coloring with various dyes of morphological elements of micromycetes in pure cultures allows you to identify mycelial hyphae of various thicknesses, spores, conidia, other morphological structures and carry out a quick preliminary identification of dermatomycetes and opportunistic mold fungi in smears.

Novel Bioactivation of Denture Liner and Its Effect on Tensile Bond Strength and Structural Morphology

Novel Bioactivation of Denture Liner and Its Effect on Tensile Bond Strength and Structural Morphology

Rock failure deformation characteristics and mechanical parameter prediction of Xujiahe formation gas reservoir in Tianfu area, Sichuan Basin

The integrated geological-engineering reservoir reconstruction of Xujiahe Formation in Tianfu area needs accurate evaluation of rock mechanics characteristics and prediction of three-dimensional rock mechanics parameter field. The stress-strain curve characteristics, failure deformation mode, mechanical strength, and confining pressure effect are analyzed by mechanical tests. The longitudinal, lateral, and spatial distribution characteristics of rock mechanics parameters are evaluated through the combination of logging and seismic. The results show that damage morphology of mudstone is more complex than that of sandstone. With the increase of confining pressure, rock fracture pattern gradually changes from splitting failure to high angle shear failure. The mechanical strength of sandstone and mudstone increases with the increase of confining pressure, and high porosity of sandstone results in a higher confining pressure effect. The longitudinal distribution of rock mechanics parameters is significantly affected by lithology. Sandstone has high strength and little intra-layer difference, while mudstone is the opposite. The lateral distribution shows obvious sedimentary facies control characteristics, and the mechanical strength of rock in the northwest region is significantly lower than that in the southeast region. The spatial distribution is greatly affected by structural morphology and faults. The research will provide support for engineering dessert selection and fracturing reconstruction.

Corrosion-mechanical destruction of bainite structures in oilfield environments

The main direction in solving the problem of increasing the reliability of field equipment, is the creation of new steels with higher resistance to corrosion-mechanical destruction. Currently, to produce oil and gas pipeline systems, low-carbon, low-alloy steels are used, in which lath carbide-free bainite is formed when quenched in water. Such a structure provides a combination of high strength and resistance to brittle fracture. However, issues of increasing corrosion resistance are still open. The purpose of this work is to identify the structural condition of low-carbon, low-alloy, pipe steels, providing a combination of high mechanical properties with increased corrosion resistance in oilfield environments. The studies were carried out on the latest generation 08KhFA, 08KhFMA and 05KhGB steels, most popular when manufacturing oil and gas pipelines. Samples for the study were cut from the pipes and quenched from the austenite region in water, which formed the structure of lath carbide-free bainite. The quenched samples were tempered at temperatures of 200, 300, 400, 500, 600, and 700°C. To identify the relationship between the morphology of bainite structures and their properties, the samples after quenching and tempering at each temperature, were subjected to metallographic analysis, X-ray diffraction analysis, mechanical tests, and corrosion resistance tests. The work shows the sequence of structure transformation, temperature ranges of phase and structural transformations, changes in mechanical properties, and corrosion resistance that occur during tempering of lath carbide-free low-carbon bainite. It is shown that tempering of lath carbide-free bainite (08KhFA, 08KhMFA and 05KhGB steels) does not affect the rate of carbon dioxide corrosion. It has been found that medium tempering forms the structural condition of carbide-free low-carbon lath bainite providing a combination of high mechanical properties and high corrosion resistance in oil field environments. For each of the steels under study, the authors give recommended heat treatment modes.