scholarly journals PREPARATION OF BIOCOMPOSITES BASED ON NANOSCALE HYDROXYAPATITE WITH ZIRCONIUM AND SILICON OXIDES

2021 ◽  
pp. 655-663
Author(s):  
Екатерина Анатольевна Богданова ◽  
Владимир Михайлович Скачков ◽  
Игорь Маратович Гиниятуллин ◽  
Данил Ильич Переверзев ◽  
Ксения Валерьевна Нефедова
Keyword(s):  
Composite Material ◽  
Patent Application ◽  
Strength Characteristics ◽  
Degree Of Crystallinity ◽  
Uniform Structure ◽  
Quantitative Composition ◽  
Constant Composition ◽  
New Material ◽  
Physicochemical Methods ◽  
High Degree

В статье обсуждается возможность получения упрочненного композиционного материала с пористой структурой на основе наноструктурированного гидроксиапатита, синтезированного методом осаждения из раствора. Новый материал получен путем механохимичекого синтеза гидроксиапатита с армирующими добавками диоксида циркония и кремниевой кислоты. Синтезированные образцы аттестованы с использованием современных физико-химических методов анализа. Показано влияние качественного и количественного состава композита на протекание процессов спекания, пористость, прочностные характеристики, степень дисперсности и морфологию исследуемых образцов. Экспериментально установлено, что максимальными прочностными характеристиками и постоянным составом обладает образец Ca(PO)(OH) -15%SiO⋅nHO-5%ZrO. Композиционный материал обладает плотной равномерной структурой с высокой степенью кристалличности, с развитой пористостью, является перспективным материалом для дальнейших исследований с целью внедрения его в медицинскую практику. На разработанный композиционный материал подана заявка на патент. The article discusses the possibility of obtaining a hardened composite material with a porous structure based on nanostructured hydroxyapatite (HAP) synthesized by precipitation from a solution. The new material was obtained by the mechanochemical synthesis of HAP with reinforcing additives of zirconium dioxide and silicic acid. The synthesized samples are certified using modern physicochemical methods of analysis. The influence of the qualitative and quantitative composition of the composite on the sintering processes, porosity, strength characteristics, the degree of dispersion and morphology of the studied samples is shown. It has been experimentally established that the sample has the maximum strength characteristics and a constant composition of Ca(PO)(OH) -15%SiO⋅nHO-5%ZrO. The composite material has a dense uniform structure with a high degree of crystallinity, with a developed porosity, is a promising material for further research in order to introduce it into medical practice. A patent application has been filed for the developed composite material.

scholarly journals CREATING BIOCOMPOSITES BASED ON NANO-SIZED HYDROXYAPATITE DOPED WITH ZIRCONIUM OXIDE AND CALCIUM FLUORIDE

2020 ◽  
pp. 697-705
Author(s):  
Данил Ильич Переверзев ◽  
Екатерина Анатольевна Богданова ◽  
Ксения Валерьевна Нефедова
Keyword(s):  
Calcium Fluoride ◽  
Zirconium Oxide ◽  
Strength Characteristics ◽  
Degree Of Crystallinity ◽  
Uniform Structure ◽  
Quantitative Composition ◽  
Constant Composition ◽  
Qualitative And Quantitative ◽  
High Degree ◽  
Sintering Processes

В статье обсуждается возможность упрочнения наноструктурированного гидроксиапатита (ГАП), полученного осаждением из раствора, путем введения оксида циркония и фторида кальция. Показано влияние качественного и количественного состава на протекание процессов спекания и прочностные характеристики исследуемых образцов. Экспериментально установлено, что максимальными прочностными характеристиками и постоянным составом обладает образец Ca(PO)(OH) - 15%CaF -5%ZrO. Композит обладает плотной равномерной структурой с высокой степенью кристалличности, является перспективным материалом для дальнейших исследований с целью внедрения его в медицинскую практику. The article discusses the possibility of strengthening nanostructured hydroxyapatite (HAP) obtained by precipitation from a solution by introducing zirconium oxide and calcium fluoride. The influence of qualitative and quantitative composition on sintering processes and strength characteristics of investigated samples has been shown. It was found experimentally that the sample has the maximum strength characteristics and constant composition Ca(PO)(OH) - 15%CaF -5%ZrO. The composite has a dense uniform structure with a high degree of crystallinity and is a promising material for further research in order to introduce it into medical practice.

scholarly journals DEVELOPMENT OF COMPOSITE MATERIALS BASED ON NANOSCALE HYDROXYAPATITE REINFORCED WITH ALUMINUM AND ZIRCONIUM OXIDES

2020 ◽  
pp. 571-579
Author(s):  
Игорь Маратович Гиниятуллин ◽  
Екатерина Анатольевна Богданова ◽  
Ксения Валерьевна Нефедова
Keyword(s):  
Composite Materials ◽  
Aluminum Oxide ◽  
Medical Practice ◽  
Zirconium Oxide ◽  
Annealing Temperature ◽  
Linear Shrinkage ◽  
Degree Of Crystallinity ◽  
Uniform Structure ◽  
Zirconium Oxides ◽  
High Degree

В статье обсуждается возможность упрочнения наноструктурированного гидроксиапатита (ГАП), полученного осаждением из раствора, путем введения армирующих добавок оксида алюминия и оксида циркония. Оценено влияние количества вводимой добавки и температуры отжига на линейную усадку, морфологию и микротвердость материала. Установлено, что максимальными прочностными характеристиками, плотной равномерной структурой с высокой степенью кристалличности обладает образец Ca(PO)(OH) -15%AlO -5%ZrO. Композит данного состава является перспективным материалом для дальнейших исследований с целью внедрения его в медицинскую практику. The article discusses the possibility of strengthening nanostructured hydroxyapatite (HAP) obtained by precipitation from a solution by introducing reinforcing additives of aluminum oxide and zirconium oxide. The influence of the amount of the added additive and the annealing temperature on the linear shrinkage, morphology and microhardness of the material was evaluated. It was found that the sample has the maximum strength characteristics, a dense uniform structure with a high degree of crystallinity Ca(PO)(OH) -15%AlO -5%ZrO. The composite of this composition is a promising material for further research in order to introduce it into medical practice.

scholarly journals Characterizing Bacterial Cellulose Produced byKomagataeibacter sucrofermentans H-110 on Molasses Medium and Obtaining a Biocomposite Based on It for the Adsorption of Fluoride

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1422
Author(s):  
Viktor V. Revin ◽  
Alexander V. Dolganov ◽  
Elena V. Liyaskina ◽  
Natalia B. Nazarova ◽  
Anastasia V. Balandina ◽  
...  
Keyword(s):  
Composite Material ◽  
Adsorption Capacity ◽  
Bacterial Cellulose ◽  
Functional Materials ◽  
Degree Of Crystallinity ◽  
Maximum Adsorption Capacity ◽  
Fluoride Ions ◽  
Sorption Ability ◽  
Wide Range ◽  
Biocomposite Material

Currently, there is an increased demand for biodegradable materials in society due to growing environmental problems. Special attention is paid to bacterial cellulose, which, due to its unique properties, has great prospects for obtaining functional materials for a wide range of applications, including adsorbents. In this regard, the aim of this study was to obtain a biocomposite material with adsorption properties in relation to fluoride ions based on bacterial cellulose using a highly productive strain of Komagataeibacter sucrofermentans H-110 on molasses medium. Films of bacterial cellulose were obtained. Their structure and properties were investigated by FTIR spectroscopy, NMR, atomic force microscopy, scanning electron microscopy, and X-ray structural analysis. The results show that the fiber thickness of the bacterial cellulose formed by the K. sucrofermentans H-110 strain on molasses medium was 60–90 nm. The degree of crystallinity of bacterial cellulose formed on the medium was higher than on standard Hestrin and Schramm medium and amounted to 83.02%. A new biocomposite material was obtained based on bacterial cellulose chemically immobilized on its surface using atomic-layer deposition of nanosized aluminum oxide films. The composite material has high sorption ability to remove fluoride ions from an aqueous medium. The maximum adsorption capacity of the composite is 80.1 mg/g (F/composite). The obtained composite material has the highest adsorption capacity of fluoride from water in comparison with other sorbents. The results prove the potential of bacterial cellulose-based biocomposites as highly effective sorbents for fluoride.

scholarly journals Synthesis and Characterization of Nano-Sized 4-Aminosalicylic Acid–Sulfamethazine Cocrystals

Pharmaceutics ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 277 ◽  
Author(s):  
Ala’ Salem ◽  
Anna Takácsi-Nagy ◽  
Sándor Nagy ◽  
Alexandra Hagymási ◽  
Fruzsina Gősi ◽  
...  
Keyword(s):  
High Power ◽  
Active Pharmaceutical Ingredient ◽  
Polymorphic Form ◽  
Degree Of Crystallinity ◽  
Dissolution Enhancement ◽  
Aminosalicylic Acid ◽  
Nano Technology ◽  
Power Ultrasound ◽  
High Power Ultrasound ◽  
High Degree

Drug–drug cocrystals are formulated to produce combined medication, not just to modulate active pharmaceutical ingredient (API) properties. Nano-crystals adjust the pharmacokinetic properties and enhance the dissolution of APIs. Nano-cocrystals seem to enhance API properties by combining the benefits of both technologies. Despite the promising opportunities of nano-sized cocrystals, the research at the interface of nano-technology and cocrystals has, however, been described to be in its infancy. In this study, high-pressure homogenization (HPH) and high-power ultrasound were used to prepare nano-sized cocrystals of 4-aminosalysilic acid and sulfamethazine in order to establish differences between the two methods in terms of cocrystal size, morphology, polymorphic form, and dissolution rate enhancement. It was found that both methods resulted in the formation of form I cocrystals with a high degree of crystallinity. HPH yielded nano-sized cocrystals, while those prepared by high-power ultrasound were in the micro-size range. Furthermore, HPH produced smaller-size cocrystals with a narrow size distribution when a higher pressure was used. Cocrystals appeared to be needle-like when prepared by HPH compared to those prepared by high-power ultrasound, which had a different morphology. The highest dissolution enhancement was observed in cocrystals prepared by HPH; however, both micro- and nano-sized cocrystals enhanced the dissolution of sulfamethazine.

scholarly journals Vibroacoustic Assessment of an Innovative Composite Material for the Roof of a Coupe Car

2021 ◽  
Vol 11 (3) ◽  
pp. 1128
Author(s):  
Nunziante Cascone ◽  
Luca Caivano ◽  
Giuseppe D’Errico ◽  
Roberto Citarella
Keyword(s):  
Composite Material ◽  
Transfer Functions ◽  
Realistic Model ◽  
Point Of View ◽  
Damping Capacity ◽  
Geometry Structure ◽  
Fiberglass Composite ◽  
New Material ◽  
Static Rigidity ◽  
Innovative Material

The objective of this paper is the vibroacoustic evaluation of an innovative material for a sports car roof, aiming at replacing fiberglass composite materials. Such evaluation was carried out using numerical and experimental analysis techniques, with cross-comparison between the corresponding results. The innovative material under analysis is a composite material, with a thermoplastic polypropylene matrix and reinforcement made of cellulose fibers. In order to validate the virtual dynamic modeling of the new material, the inertance on different points of some sheets made of the material under analysis was evaluated by an in-house made experimental activity, performed in the CRF (Fiat Research Center) test room, and cross-compared with corresponding results from a numerical analysis performed with the MSC Nastran software. Then, a realistic model of the car roof of the Alfa Romeo 4C car, made with the new material, was implemented and analyzed from the vibroacoustic point of view. The mere switch to the new material, with no changes in the geometry/structure of the car roof, did not allow preserving the original values of static rigidity, dynamic rigidity, and configuration of modal shapes. For this reason, a geometric/structural optimization of the component was performed. Once the new geometry/structure was defined, a vibroacoustic analysis was carried out, checking for a possible coupling between the fluid cavity modes and the structure car body modes. Finally, the vibroacoustic transfer functions to the driver’s ear node were assessed, considering two different excitation points on the structure. The excellent damping capacity of the proposed material led to an improvement in the vibroacoustic transfer functions and to a reduction in the weight of the pavilion.

Meat qualities in the sheep with special reference to Scottish breeds and crosses. I

1939 ◽  
Vol 29 (4) ◽  
pp. 544-626 ◽  
Author(s):  
H. Pálsson
Keyword(s):  
Scientific Basis ◽  
Accurate Estimate ◽  
Quantitative Composition ◽  
Carcass Quality ◽  
Strongly Correlated ◽  
Precise Measure ◽  
Total Fat ◽  
Highly Correlated ◽  
High Degree ◽  
The Relationship

1. By establishing the relationship between linear carcass measurements and the quantitative composition of the carcass in terms of bone, muscle and fat, we have provided a scientific basis for the use of many measurements hitherto only presumed to provide an index to carcass quality.2. External carcass measurements are correlated with weight of the skeleton. The most useful for this purpose are length of tibia + tarsus and length of the fore-cannon.3. As indices of muscle, external measures are only of indirect value. Thus, both F – T and G/F × 100 are strongly correlated with weight of muscle as a percentage of skeletal weight.4. Similarly, F provides an index of fat, being negatively correlated with fat as a percentage of bone.5. For muscle and fat internal measures permit a more precise estimate to be made. A + B is the best index of the former while C + J + Y provide the most accurate estimate of the weight of fat.6. Still better indices for muscle and fat are provided by suitable combinations of external and internal measurements. Thus L/10 + A + B is very highly correlated with the weight of muscle, and L/10 × (C + J + Y) is the best index of fat in the hoggets. For bone, a most efficient single index is shown to be the weight of the fore-cannon bone.7. The weight of the skeleton can be estimated with a high degree of accuracy from the weight of the bones in either one leg or loin. Both these joints combined, however, provide a still better estimate.8. The muscle in one leg or loin + leg provides an excellent index of the weight of muscle in the whole carcass.9. The fat in one leg, loin, or both these joints combined provides a good index of the weight of the total fat in the carcass. Both joints combined give the most precise measure.10. The value of certain measurements which are not necessarily associated with the quantity of the major tissues of the carcass, but which nevertheless have important qualitative significance, is emphasized.

Examination of Microstructure of Cement Composite Material for Renovation of Horizontal Structures

2019 ◽  
Vol 808 ◽  
pp. 103-108
Author(s):  
Lenka Mészárosová ◽  
Vít Černý ◽  
Rostislav Drochytka ◽  
Winfried Malorny
Keyword(s):  
Thermal Conductivity ◽  
Composite Material ◽  
High Temperature ◽  
Surface Temperature ◽  
Cement Composite ◽  
Volume Weight ◽  
Coefficient Of Thermal Conductivity ◽  
New Material ◽  
Properties Of Materials ◽  
Low Volume

Development of new material is focused on modification of properties of materials with silicate binder so that these could be used for renovation of horizontal structures of high-temperature devices and at the same time contribute to reduction of heat transportation of constructions with higher surface temperature (in this case 200 and 500 °C). Main requirements for this material is low volume weight and low coefficient of thermal conductivity. This paper assesses influence of exposition to higher temperatures on microstructure.

Redefining the deviance objective for generalised linear models

2012 ◽  
Vol 17 (3) ◽  
pp. 491-509
Author(s):  
A. C. Lovick ◽  
P. K. W. Lee
Keyword(s):  
Linear Models ◽  
Patent Application ◽  
Generalised Linear Models ◽  
Number Of Factors ◽  
Efficient Calculation ◽  
Unseen Data ◽  
Data Points ◽  
New Material ◽  
Price Comparison Sites ◽  
Generalised Linear Modelling

AbstractThis paper defines the ‘Case Deleted’ Deviance - a new objective function for evaluating Generalised Linear Models, and applies this to a number of practical examples in the pricing of general insurance. The paper details practical approximations to enable the efficient calculation of the objective, and derives modifications to the standard Generalised Linear Modelling algorithm to allow the derivation of scaled parameters from this measure to reduce potential over fitting to historical data. These scaled parameters improve the predictiveness of the model when applied to previously unseen data points, the most likely being related to future business written. The potential for over fitting has increased due to number of factors now used, particularly in pricing personal lines business and the advent of price comparison sites which has increased the penalties of mis-estimation. New material in this paper has been included in a UK patent application No. 1020091.3.

A New Fiber Reinforced Composite Material Properties and Engineering Application

2011 ◽  
Vol 399-401 ◽  
pp. 1294-1297
Author(s):  
Li Xin Yin ◽  
Jing Yan ◽  
Guo Wen Li ◽  
Wei Qiang Xu
Keyword(s):  
Composite Material ◽  
Thermal Insulation ◽  
Low Cost ◽  
Engineering Application ◽  
Outer Wall ◽  
Reinforced Composite ◽  
High Durability ◽  
New Material ◽  
Construction Efficiency ◽  
Reinforced Composite Material

External thermal insulation technology for building external wall has gradually been one important technology of the construction energy conservation. A new fibre reinforced composite material is made up of cement, flyash, silicon ash, the inflation polystyrene pellet and the admixture, after the experiment examination and the engineering application, the effect of thermal insulation is good, the performance of fire proof is excellent, high durability and low cost, good property of sound absorption. Solved the quality problem exist in the traditional building outer wall thermal insulation system such as the thermal insulation layer fall off, split, seep and so on. The new material can product standardize in factory, increase the construction efficiency; in favor of the construction industrialization and could promote construction business sustainable development.

Heteroepitaxial Growth Of ZnO Films BY PLD

1997 ◽  
Vol 474 ◽  
Author(s):  
R. D. Vispute ◽  
V. Talyansky ◽  
Z. Trajanovic ◽  
S. Choopun ◽  
M. Downes ◽  
...  
Keyword(s):  
Oxygen Pressure ◽  
Surface Region ◽  
Optical Quality ◽  
Degree Of Crystallinity ◽  
Zno Films ◽  
Heteroepitaxial Growth ◽  
Near Surface ◽  
Ion Channeling ◽  
Deposition Parameters ◽  
High Degree

ABSTRACTHere we present our recent work on the fabrication of high crystalline and optical quality ZnO films on sapphire (001) by pulsed laser deposition. The influence of deposition parameters such as the substrate temperature, oxygen pressure, laser fluence, and pulse repetition rate on the crystalline quality of ZnO layers has been studied. The Ω-rocking curve FWHM of the (002) peak for the films grown at 750°, oxygen pressure 10−5 Torr was 0.17°. The XRD-Ф scans studies revealed that the films were epitaxial with a 30° rotation of the unit cell with respect to the sapphire to achieve a low energy configuration for epitaxial growth. The high degree of crystallinity was confirmed by ion channeling technique providing a minimum Rutherford backscattering yield of 2–3% in the near surface region (-2000Å). The atomic force microscopy revealed smooth hexagonal faceting of the films. The optical absorption edge measured by UV-Visible spectroscopy was sharp at 383 nm. Excellent crystalline properties of these epi-ZnO/sapphire heterostractures are thus promising for III-V nitride heteroepitaxy.

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