In situ composites

Nano-hydroxyapatite/starch composite was synthesized using in situ precipitation. Starch concentration effect on the structure of composite was examined. Characterization of the obtained samples, The X-ray diffraction and Fourier transform infrared spectroscopy demonstrated the purity of the formed nano-HA in the starch matrix. Morphology studies of the samples, checked by field emission scanning electron microscope and transmission electron microscope, show the effects of starch on the size, shape, and morphology of hydroxyapatite nanoparticles.

6p dianmotminh02 03-05-2024 5 1   Download

In ebook "In-situ small-angle X-ray scattering investigation of transient nanostructure of multi-phase polymer materials under mechanical deformation" the evolution of the materials structure is visualized and quantitatively analyzed from exhaustive sequences of scattering images. Three different classes of polymer composites are presented as typical and illustrative examples. The obtained results illustrate that the interactions of their components can cause unpredictable structural effects, ultimately leading to a weakening of the material, where a reinforcement was expected.

117p coduathanh1122 27-03-2024 1 1   Download

Trong bài viết này, graphen oxit (GO) được tổng hợp từ graphite bằng phương pháp Hummer cải tiến, MnO2 và AgNPs được tổng hợp lần lượt trên nền GO bằng phương pháp in situ. Vật liệu nano composit tổng hợp AgNPs/MnO2/GO đã được đo các đặc trưng bởi kính hiển vi điện tử quét (SEM) kết hợp với quang phổ tán sắc năng lượng (EDS) để chứng minh đặc trưng thành phần nguyên tố của vật liệu.

12p vimarillynhewson 02-01-2024 4 2   Download

Tóm tắt Luận án Tiến sĩ Hóa học "Nghiên cứu điều chế in situ hydrogel composite trên nền gelatine và chitosan/alginate/chondroitin sulfate định hướng trong tái tạo xương" được nghiên cứu với mục tiêu: Nghiên cứu tổng hợp vật liệu mới trên nền gelatine với polysaccharide (chitosan, alginate, chondroitin sulfate) kết hợp với các hạt nano biphasic calcium phostphate để tạo ra vật liệu có khả năng tương hợp sinh học, kích thích sự phát triển xương, có thời gian suy giảm phù hợp với thời gian xương phát triển để có thể ứng dụng trong lĩnh vực tái tạo xương.

26p vijeff 01-12-2023 13 5   Download

Luận án Tiến sĩ Hóa học "Nghiên cứu điều chế in situ hydrogel composite trên nền gelatine và chitosan/alginate/chondroitin sulfate định hướng trong tái tạo xương" trình bày các nội dung chính sau: Điều chế và khảo sát các đặc tính của các hạt khoáng nano BCP; Tổng hợp và đánh giá cấu trúc, hình thái của các hydrogel và hydrogel composite gelatin-tyramin (GTA); Tổng hợp và đánh giá cấu trúc, hình thái của các hydrogel và hydrogel composite chitosan 4-hydroxyphenylacetic acid (CHPA);...

169p vijeff 01-12-2023 9 5   Download

Cultivated barley belongs to the tertiary genepool of hexaploid wheat. Genes of interest can be transferred from barley into wheat through wide hybridization. The application of wheat-barley introgression lines could provide an excellent tool for the transfer of earliness, favourable amino acid composition, biotic stress resistance, abiotic stress tolerance, or good tillering ability into wheat.

13p vinarcissa 21-03-2023 4 1   Download

An environmentally benign synthesis of a magnetically responsive carboxymethylated cellulose nanofibril-based material is reported. Applied experimental conditions lead to the in-situ formation of magnetite nanoparticles with primary particle sizes of 2.0–4.0 nm or secondary particles of 3.6–16.4 nm depending on whether nucleation occurred between individual carboxymethylated cellulose nanofibrils, or on exposed fibril surfaces.

9p viginny 30-12-2022 7 2   Download

Unlike conventional composite beam which use headed-shear studs, in shallow concrete-steel composite floorbeam system, the web opening of steel beam infilled with in-situ concrete is considered as shear connector. In this paper, empirical formula for the shear resistance determination of trapezoid concrete dowel in shallow concrete-steel composite floor-beam is formed.

9p vimclaren 12-10-2022 4 2   Download

Chitosan-magnetite composite (CS-MNPs) was made by an in-situ combined co-precipitation method. Material characteristics were investigated by X-ray, SEM, BET, and VSM methods. CS-MNPs has a spherical shape with a diameter of around 20 nm and a surface area of 119.43 m2 /g.

8p viirenerosenfeld 02-06-2022 11 1   Download

Composites of BrPMAAm and FPMAAm monomers were obtained using 2%, 4%, 6%, and 10% organoclay by in situ polymerization. Molecular weights for poly(BrPMAAm), poly(BrPMAAm)-10%OSMT, poly(FPMAAm), and poly(FPMAAm)-10%OSTM were 91,300, 31,300, 17,400, and 23,700, respectively. Thermal properties of the nanocomposite were also developed when compared to the pure homopolymer. The beginning thermal decomposition temperature of nanocomposites was shifted to higher temperature. An exfoliated structure was found for the nanocomposites.

9p langthannam 29-12-2021 8 0   Download

The present paper describes in situ green immobilization of silver nanoparticles on MnFe2O4@SiO2 nanospheres using Epilobium parviflorum (EP) without using any other toxic chemicals and reducing or stabilizing agents.

12p langthannam 29-12-2021 11 0   Download

The fracture toughness of the composites showed a reverse trend. By adjusting the graphite content to 6 wt%, excellent control of microstructure could be achieved for the prepared composites with a higher amount of ZrC and lower content of other unfavorable phases.

7p meyerowitz 25-12-2021 13 0   Download

This type of floor beam structure consists of built-up hollow-shallow steel beam mandatory connected with cast in situ concrete slab through the openings at both side of web along the beam. The shear connection level of composite beam is depended on not only the friction at the connected surface between hollow steel section and concrete but also the shear resistance of concrete dowels, which go through the openings

9p inception36 30-11-2021 9 1   Download

Four composites of hydroxyapatite/hydrolyzed polyacrylamide (HAP/HPAM-n) were prepared using an in situ wet chemical method. The synthesis was performed by preparing a suspension of calcium in a copolymer solution having a known HPAM concentration. Phosphoric acid was added dropwise to each suspension to obtain HAP/HPAM-n composites. The effect of initial copolymer amount on the composite properties was investigated using XRD, FTIR, TGA, and SEM/EDS analysis. The obtained results were compared to the HAP sample synthesized under the same conditions and without copolymer.

16p tudichquannguyet 29-11-2021 8 1   Download

Highly porous Ti matrix composites can be a solution for some of the major clinical concerns for the load bearing implants such as low tribocorrosion resistance, stress shielding, and lack of biological anchorage. In order to respond to these needs, highly porous Ti-TiB-TiNx in-situ composites were synthesized by pressureless sintering using BN as reactant and urea as space holder. Corrosion behaviour was investigated at body temperature, in phosphate buffer saline solution (PBS), by measuring open circuit potential (OCP) and cyclic polarization.

12p tudichquannguyet 29-11-2021 12 1   Download

Mechanical alloying was used to synthesize in-situ copper based composite reinforced by binary niobiumtitanium-carbide from Cu, Nb, Ti and graphite powder mixture. The nominal composition was correponded to Cu-30 vol.% (Nb,Ti)C. XRD patterns showed that (Nb, Ti)C was not formed in the as-milled powder after 5 hours of milling but was precipitated with a subsequent sintering at 900oC. Milling time has showed a great influence on both mechanical and physical properties of the sintered composite pellets

5p quenchua12 10-05-2021 13 1   Download

The aim of this research is to investigate the influence of the sintering temperature on the properties of the in-situ carbide (Nb,Ti)C in a copper matrix synthesized via mechanical alloying and powder metallurgy from elemental powders of Cu, Nb, Ti and graphite. The mixture of starting powders with compositions corresponding to Cu-15vol.% (Nb, Ti)C was mechanical alloyed using a planetary ball mill for 20 hours.

6p quenchua12 10-05-2021 11 1   Download

Trong bài viết này, nanocompozit silica/polypyrol (SiO2/PPy) được tổng hợp bằng phương pháp vi nhũ in situ, ứng dụng trong lớp phủ hữu cơ bảo vệ chống ăn mòn cho thép CT3. Ảnh hưởng của thành phần dung môi đến các đặc trưng, tính chất của nanocompozit SiO2/PPy được đánh giá thông qua các phương pháp đo IR, SEM, EDX, XPS, độ dẫn điện.

13p trinhthamhodang1219 07-05-2021 37 2   Download

"The journal of Nuclear science and technology - Volume 9/Number 4, 2019" present bubble behavior in liquid-gas two-phase flow behind a cross-shaped obstacle in a vertical circular duct; study on transmutation efficiency of the VVER-1000 fuel assembly with different minor actinide compositions; determination of in situ detection efficiency for IM-NAA of non-standard geometrical samples...

60p trinhthamhodang1218 14-03-2021 15 2   Download

India is endowed with plenty of renewable wheat and rice straw, around 300 million tonnes annually. Due to its poor C: N ratio it does not decompose easily which can be accelerated using tender sunnhemp, rich in nitrogen.

7p trinhthamhodang1216 19-11-2020 10 2   Download