Thermal Gravimetry Analysis Research Articles

Calorific value analysis, reduction of period weight, reaction rate, activation energy of old coconut, young coconut waste briquette burning, cocoa

Indonesia was a country with considerable biomass energy potential. Biomass energy could be explored from agricultural waste, abundant and easily obtained biomass, for example: old coconut waste, young coconut waste and cocoa waste. This study aims to obtain the heating value of charcoal briquettes from biomass of old coconut waste, young coconut waste and cocoa waste. The study was conducted on a laboratory scale, and used a complete randomized design with 3 repetitions. The procedure of this study begins with sorting raw materials, cutting and drying. Next carbonize, grind, filter, add tapioca glue, then print, and press at 115 kg/cm2. Carbonize at 400°C, for 30, 60, 90 and 120 minutes. The briquettes produced would be analyzed for density analysis, calorific value, and highest calorific value. Then analyzed for reducing the mass and rate of the combustion reaction. The test results of the old coconut briquette density were 0.937 g/l, the highest calorific value was 6.927 kal/g with a 90 minute carbonization time. Old coconut briquettes had the lowest or lowest combustion reaction rate compared to the level of combustion reaction rate of young coconut briquettes and cocoa briquettes. The effect of a higher density value, the higher the briquette heat value and the slower or lower the combustion rate. In the Thermogravimetry test using Thermal Gravimetry Analyzer (TGA), the highest decrease in mass of old coconut waste briquettes compared to young coconut waste briquettes and cacao waste briquettes was 55.34% from 590.5°C to 599.2°C. In Thermal Gravimetric Differentials. (DTG) shows the rate of combustion reaction in old coconut waste briquettes is 0.10%/minute with an air speed of 5 ml/minute.

Statistical Approach for Water Glass Precursor Preparation from Bamboo Leaf Silica

The bamboo leaf consists of high silica content. In this study, the bamboo silica was utilized as water glass. Water glass can also be used as eco-friendly precursors for the preparation of silica aerogel. The extraction process of silica from bamboo leaf have been carried out through acid leaching and combustion process at 750°C based on thermal gravimetry analysis. This paper is aimed to assess the effect of two types of alkali hydroxide and concentrations producing water glass of bamboo leaf silica. The result was analyzed by using a 22-factorial design with six replications. The alkali hydroxide types were sodium hydroxide and potassium hydroxide with a concentration of 4 M and 6 M, respectively. The study was executed in several steps, i.e. pre-treatment of bamboo leaf, leaching process, combustion, purification of bamboo leaf silica and synthesis of water glass. The optimum condition of water glass products was obtained at silica concentration of 41.08 ppm and density of 1.23 g/L for potassium hydroxide, while at 40.15 ppm and 1.30 g/L for sodium hydroxide. ANOVA analysis resulted in a significant effect for type of hydroxide and concentration releasing model for silica concentration response. This study also characterized the silica structure and composition by instrumentation analysis for silica solid obtained from optimum water glass condition with potassium hydroxide. It can be denoted the physical behavior of silica solid from water glass by potassium hydroxide did not differ from previous research of water glass by sodium hydroxide.

Reinforcing of phenol formaldehyde resin by graphene oxide and lignin nanohybrids

Utilizing synergetic effects of different fillers was an important strategy to develop high-performance polymer nanocomposites. In this work, novel hybrid nanofillers composed of graphene oxide (GO) and alkali lignin (L) were obtained successfully, and their reinforcing effect of phenol formaldehyde (PF) resin was fully investigated. The structures, morphologies, and properties of the GO-L nanocomposites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscope, thermal gravimetry analysis, and Raman spectra. Dynamic mechanical analysis results showed that the GO-L–reinforced PF resin is much better than the single added GO and lignin with the same weight ratio. The effect of the filling ratio of GO-L on the storage modulus of PF was also investigated. Results showed that the storage modulus of PF was increased from 2015 MPa to 3675 MPa with the addition of 2 wt% of GO-L (3:7) hybrids.

Effect of Fiber Chemical Treatments on Performance of Date Palm Fibers Using Response Surface Methodology

The objective of this study is to investigate the effect of optimized alkali treatment on the lignin reduction of date palm fibers. This kind of fiber treatment is used to improve the performance of natural fibers. The experiments conducted by central composite design (CCD) through response surface methodology (RSM) with four independent factors, each at five levels. Raw fibers underwent a surface modification method by alkali treatment with four independent variables, hydrogen peroxide (2–6 wt %), sodium hydroxide (3–7 wt %), temperature (30–46°C), and treatment time (14–18 h). The Fourier transform infrared spectroscopy, tensile properties, and thermal gravimetry analysis of untreated, treated, and optimized treated fibers were investigated. The results showed that the optimized levels for hydrogen peroxide and sodium hydroxide were 4.9 and 5.2 wt %. The optimum temperature and treatment time were found to be 38.8°C and 17.8 h, respectively. At the optimized values of the independent variables, the lignin content of the fibers was 10.11%. Meantime, the tensile test results show that alkali treatment with optimized values improves the performance of fibers, although no high values are obtained. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 2019

Empirical relationship between band gap and synthesis parameters of chemical vapor deposition-synthesized multiwalled carbon nanotubes

In this study, an empirical relationship between the energy band gap of multi-walled carbon nanotubes (MWCNTs) and synthesis parameters in a chemical vapor deposition (CVD) reactor using factorial design of experiment was established. A bimetallic (Fe-Ni) catalyst supported on CaCO3 was synthesized via wet impregnation technique and used for MWCNT growth. The effects of synthesis parameters such as temperature, time, acetylene flow rate, and argon carrier gas flow rate on the MWCNTs energy gap, yield, and aspect ratio were investigated. The as-prepared supported bimetallic catalyst and the MWCNTs were characterized for their morphologies, microstructures, elemental composition, thermal profiles and surface areas by high-resolution scanning electron microscope, high resolution transmission electron microscope, energy dispersive X-ray spectroscopy, thermal gravimetry analysis and Brunauer-Emmett-Teller. A regression model was developed to establish the relationship between band gap energy, MWCNTs yield and aspect ratio. The results revealed that the optimum conditions to obtain high yield and quality MWCNTs of 159.9% were: temperature (700oC), time (55 min), argon flow rate (230.37 mL min–1) and acetylene flow rate (150 mL min–1) respectively. The developed regression models demonstrated that the estimated values for the three response variables; energy gap, yield and aspect ratio, were 0.246 eV, 557.64 and 0.82. The regression models showed that the energy band gap, yield, and aspect ratio of the MWCNTs were largely influenced by the synthesis parameters and can be controlled in a CVD reactor.

Radiation stability and thermal behaviour of modified UF resin using biorenewable raw material-furfuryl alcohol

The thermal stability of organic-inorganic nano-composites prepared by a two-stage polymerization of urea-formaldehyde resin (UF) with furfuryl alcohol (FA) and TiO2 before and after irradiation has been researched. The two resins of urea-formaldehyde–TiO2 composites, named: UF/TiO2 and UF/TiO2/FA, were synthesized. The thermal stability of obtained materials was studied by non-isothermal thermo-gravimetric analysis (TG), differential thermal gravimetry (DTG) and differential thermal analysis (DTA). UF hybrid composites have been irradiated (50 kGy) and after that their radiation stability was evaluated on the basis of thermal behavior. The free formaldehyde (HCOH) percentage in all prepared samples was determined. The minimum percentage values of free formaldehyde (0.04% and 0.03%) for UF/TiO2 and UF/TiO2/FA, respectively, after irradiation dose of 50 kGy are detected. The shift of temperature values for selected mass losses (T10%) to a high temperature indicates the increase in thermal stability of samples based on UF resin modified with FA.

Batch‐to‐Batch Reproducibility Studies of Pilot‐Scale Emulsion Polymerization of Poly(styrene‐co‐butyl acrylate)

Studies on emulsion polymerization (EP) of poly(styrene‐co‐butyl acrylate) [P(S‐co‐BA)] can be accessed in open literature. However, these studies are mostly focusing on lab‐scale polymerization and subsequently characterization, of which discussion on pilot‐scale or mass‐production‐scale of the polymerization is scant. This paper focuses on the batch‐to‐batch reproducibility of P(S‐co‐BA) with 78.7 mol% of styrene and 21.3 mol% of butyl acrylate via EP in 3 metric‐ton (MT) pilot‐scale reactor. Polymerization efficiency, molecular, and physical characterization of the copolymers are examined using gravimetric analysis. Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), gel permeation chromatography (GPC), thermal gravimetry analysis (TGA), differential scanning calorimeter (DSC), viscometer, capillary rheometer, particle size analyzer (including dynamic light scattering and laser diffraction techniques), and scanning electron microscope (SEM). The gravimetric analysis on the monomer conversion reveals that the polymerization in 3‐MT reactor is efficient with 100% conversion. Besides, 1H‐NMR results reveal that the styrene‐to‐butyl acrylate mole ratio of the copolymer is of close approximation of the monomer feed amount while FTIR is a rather convenient quality control (QC) tool for batch‐to‐batch reproducibility on the copolymer molecular structured. The physical characteristic of [P(S‐co‐BA)] for all five batches are considered reproducible.

Synthesis and Characterization of Melamine-Formaldehyde Microcapsules Containing Pyraclostrobin by In situ Polymerization

In this study, melamine-formaldehyde microcapsules were prepared via in situ polymerization using pyraclostrobin as the core material, melamine-formaldehyde as the wall material, Tween 80 as the emulsifier and selected a good auxiliaries. The two-stage synthesis comprised the emulsification of the oil and the formation of the wall, respectively. The prepared melamine-formaldehyde microcapsules were characterized by different techniques to estimate the structure, thermal properties, particle size distribution and morphology of microcapsule. The distribution of microcapsules was uniform and the particle size distribution was narrow. The thermal gravimetry analysis proved that the prepared microcapsules contained approximately 30% pyraclostrobin. The pyraclostrobin was microencapsulated successfully by melamine-formaldehyde resin, and an environment friendly pyraclostrobin capsule suspension was proposed in this paper.

Effect of heat treatment on hydrophobic silica aerogel.

Hydrophobic silica aerogels were heat treated under various conditions. Physical and chemical analyses were conducted to study the effect of the heat treatments on the silica aerogels. The O/Si and C/Si values in the hydrophobic silica aerogels increased and decreased, respectively, with the increase in the heating temperature. C-O, -OH, and CO were detected during pyrolysis. Pyrolysis of the silica aerogels in air could be divided into 3 steps: the hydroxylation of methyl groups, the splitting of the alcoholic hydroxyl, and the oxidisation of CO. When the heat treatment temperature was lower than 350 °C, the properties of the silica aerogels showed little change. With further increase in the heat treatment temperature, the variation in the relevant parameters became more prominent. The secondary particles coalesced with one another, and the mesopores were destroyed. Consequently, the thermal conductivity and bulk density rose greatly. The carbon within the silica aerogels was released after heat treatment. As a result, the heat released in the thermal gravimetry and oxygen bomb analyses dropped remarkably with the increase in the heat treatment temperature.

Magnetic nanoparticles modified with organic dendrimers containing methyl methacrylate and ethylene diamine for the microextraction of rosuvastatin.

Magnetic nanoparticles (MNPs) modified with organic dendrimers are shown to be a viable sorbent of the microextraction of the drug rosuvastatin (RST; also known as Crestor). The MNPs were prepared from iron(II) chloride and iron(III) chloride and then coated with silicon dioxide. The coated MNPs produced by this methodhave diameters ranging from 10 to 60nm according to scanning electron microscopy. The MNPs were further modified with organic dendrimers containing methyl methacrylate and ethylene diamine. The resulting MNPs were characterized by SEM, Fourier transform infra-red and thermal gravimetry analysis. Then, the efficacy of the modified MNPs with respect to the extraction of RST was studied. The adsorption of RST by MNPs can be best described by a Langmuir isotherm. Following elution with buffer, RST was quantified by HPLC. The method was applied to the determination of RST in (spiked) human blood plasma, urine, and in tablets. RST extraction efficiencies are 54.5% in plasma, 86.6% from the drug matrix, and 94.3% in urine. The highest adsorption capacity of the RST by the MNPs adsorbent was 61 mg⋅g-1. Graphical abstract Co-precipitation was used to synthesize magnetic nanoparticles (MNPs). They were coated with a layer of SiO2 andthen branched by organic dendrimers containing methyl methacrylate (MMA) and ethylene diamine (EDA). Rosuvastatin (RST) drug was trapped between dendrimer branches, therefore adsorption capacity of the drug was stronglyincreased.

Synthesis and characterization of high durable linseed oil-urea formaldehyde micro/nanocapsules and their self-healing behaviour in epoxy coating

In this study, Urea-Formaldehyde (UF) capsules containing linseed oil were prepared via in-situ polymerization and then dispersed in epoxy coating with different capsule contents. An innovative method to maintain of capsules was proposed which enhance the durability and ease of dispersion in the coating. The capsules were synthesized with three different reactor mixing rates and its effects on the capsules morphology, thermal properties and size distribution, as well as on the state of dispersion in the epoxy coating and self-healing performance were surveyed. Synthesized capsules had trimodal distribution in the range of 3 nm to 238 μm and depending on the mixing rate; the average size of the capsules was changed. The core content of the capsules was between 59% and 96% which depends on stirrer speed. Fourirer transform infra-red (FTIR) spectra and thermal gravimetry analysis (TGA) thermograms confirmed that the linseed oil was successfully encapsulated in the UF shell. Capsules morphology, distribution and dispersion state of capsules in the self-healing coating were examined via scanning electron microscopy (SEM) and optical microscopy which verified that capsules have good dispersion and distribution in the epoxy coating. Healing of scratched coating was confirmed by optical microscope and salt spray test. The results of the salt-spray test revealed a proper corrosion resistance of self-healing coating compared to the coating without microcapsules.

Mechanism and effect of hydroxyl-terminated dendrimer as excellent chrome exhausted agent for tanning of pickled pelt

A combination chrome tanning technology which endows leather high chrome exhaustion and thermal property based on hydroxyl-terminated dendrimer (HTD) is reported. The chrome concentration in effluent, denaturation temperature (Td), enthalpy (ΔH), thermal degradation active energy (Ea), crosslinking degree of wet-blue leathers are determined by inductively coupled plasma atomic emission spectroscopy (ICP-AES), differential scanning calorimetry (DSC), thermal gravimetry analysis (TG-DTG), and X-ray diffraction (XRD), respectively. The element (especially chromium) content and distribution of wet-blue leather are also obtained by scanning electron microscopy-energy dispersive spectrometer (SEM-EDS). The results show that the chrome uptake, Td, ΔH and Ea of wet-blue leather tanned with HTD and basic chrome sulphate (HTD-Cr) can reach 94.1%, 117.4 °C and 432.2 J/g, and 153.1 kJ/mol much higher than conventional chrome tanning which is 66.1%, 112.5 °C and 129.2 J/g and 147.2 kJ/mol, respectively. It is because HTD could act as excellent masking agent with good alkaline stability, which slows down the basifying process and promotes chrome penetration towards central of wet-blue leather, resulting in evenly dispersed along the grain layer, middle layer and flesh layer of wet-blue leather. Consequently, crosslinking density of collagen increased, thereby inhibiting the outward diffusion of chrome and improving the chrome uptake. In contrast, for blank trial, the chrome mainly aggregate at grain layer and flesh layer. These results illustrate the chrome tanning promotion mechanism of HTD and provide a valuable insight of developing high exhausted chrome agent based on dendrimer for more sustainable future of leather industry.

A Kinetic Investigation of Triacetin Methanolysis and Assessment of the Stability of a Sulfated Zirconium Oxide Catalyst

AbstractIn this work, the activity and stability of a sulfated zirconium catalyst in transesterification reactions of triacetin, a model molecule, were investigated. This catalyst has Lewis and Brønsted acid sites and has shown to be highly active in reactions converting triacetin into methyl esters. This catalyst was synthesized using the impregnation method, and systematically characterized using the techniques of x‐rays diffraction (XRD), scanning electron microscopy, Fourier transform‐infrared spectroscopy (FT‐IR), Brunauer, Emmett, and Teller, and thermal gravimetry analysis (TGA). Kinetic studies were carried out to determine the activation energy as well as the reaction order. The effects of the main reaction parameters, such as temperature, the molar ratio, and the catalyst content, were evaluated. The reuse and possible leaching of the catalyst were also investigated. The highest efficiency (ca. 99% of methyl esters) was achieved in the sulfated zirconium oxide‐catalyzed transesterification reaction.

Three interpenetrating coordination polymers with 3D honeycomb networks derived from versatile ligand: 4'-(4-pyridyl)-4,2':6′,4″-terpyridine

Three interpenetrating Co(II)/Ni(II) coordination polymers, [Co(pytpy)(sfdb)]n (1), [Co2(pytpy)(sfdb)2]n (2) and [Ni(pytpy)(sfdb)]n·nH2O (3) (pytpy = 4'-(4-pyridyl)-4,2':6′,4″-terpyridine, H2sfdb = 4,4′-sulfonyldibenzoic acid) have been hydrothermally synthesized and structurally characterized. They all feature interpenetrating 3D honeycomb networks. Compound 1 is a 4-fold 3D polymeric structure, bidentate-bridging pytpy ligands join the square wave-like chains based on Co(II) centers and μ2-sfdb2- linkers to form the final 3D honeycomb network. Compound 2 is also a 3D honeycomb structure, which features 2-fold interpenetrating structure with unusual paddle-wheel secondary building units (SBUs). The topological net of compound 3 is identical to 1, but the central metal and its coordination environment are different from those of compound 1. In addition, diffuse reflectance UV–vis spectroscopic measurements and thermal gravimetry analyses have been used to characterize these compounds.

The effects of poly(amide-imide) coating on the thermal, combustion and mechanical properties of polyvinyl chloride ZnO nanocomposites

The surface of new polyvinyl chloride (PVC)/ZnO nanocomposite films was coated using semi-aromatic synthesized poly(amide-imide) (PAI) by dip-coating process. ZnO nanoparticles were organo-modified with imide functionalized polyethyleneimine (PEI) and were used for preparation of PVC nanocomposite films by solution casting method. The effect of PAI coating along with PEI surface modified ZnO nanoparticles (PSZN) on the morphology, thermal stability, combustion and mechanical properties of PVC were investigated. The uniform dispersion of ZnO nanoparticles and PAI coating manner on surface of the PVC films were confirmed by ATR-FTIR spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray and elemental mapping. From thermal gravimetry analysis (TGA) results, the 10 mass% loss temperature (T10) increased from 229 °C to 244 °C in PVC-coated with PAI containing 2 mass% of PSZN and also char residue of PVC increase from 10.5 to 28.9% in PVC-coated contaning 5 mass% of PSZN. According to microscale combustion calorimetry (MCC) and tensile test results, the peak of heat release rate decreased from 129.8 W/g to 81.2 W/g and the tensile strength increased from 28.7 to 43.6 MPa for PVC-coated containing 5 mass% of PSZN compared to the neat PVC.

Investigation of TiO2 Nanoparticles: Thermal Kinetics and Gamma Radiation Effects

This paper is part of a research project to develop natural dye-sensitized solar cells. The behavior of surface water, especially the adsorption and dissociation characteristics, is a key to understanding and promoting photo-catalytic and biomedical applications of titanium dioxide materials. Using Thermal Gravimetry Analysis, we study the interaction between water and TiO2 nanoparticles surfaces that are of interest to experiments calculations. The results show that TiO2 nanoparticles surfaces demonstrate water dissociation observed on the surface and in interlayer space. It is noticed that at 600 oC the mass loss reaches the value 1.1% after sintering and after irradiation. Gamma irradiation exhibited improved thermal stability of TiO2 nanopowder to be good dye absorber.

Characterization of PrNiO3-δ as oxygen electrode for SOFCs

The praseodymium nickelate PrNiO3-δ was recently identified as one of the decomposition products of Pr2NiO4+δ oxygen electrode, raising the question of the role of this perovskite compound on the Pr2NiO4+δ performance and ageing behaviour. Herein, the electrochemical properties of PrNiO3-δ as cathode for Solid Oxide Fuel Cells (SOFCs) is reported. PrNiO3-δ, synthesized from the citrate-nitrate route, cristallizes in an orthorhombic structure (S.G.: Pnma). Under air, a transition to high temperature rhombohedral structure (S.G.: R-3c) occurs at around 600 °C, while its oxygen vacancy amount increases from δ ≈0.05 at room temperature up to 0.10 at high temperature. Thermal gravimetry analysis (TGA) measurements coupled with X-ray diffraction (XRD) characterizations show that above 1000 °C, in air, PrNiO3-δ starts to decompose into Pr2NiO4+δ and NiO through an intermediate transformation into Pr4Ni3O10+δ. The value of the polarization resistance (Rp) of co-sintered GDC-PrNiO3-δ electrode, at 950 °C in air for 2 h, is 0.91 Ω cm2 at 600 °C under air. It remains much higher than that of co-sintered GDC-Pr2NiO4+δ electrode (Rp = 0.15 Ω cm2), which means that the perovskite does not play any significant role in the electrochemical performance during long term operation of the Pr2NiO4+δ electrode.

Development of sugar palm yarn/glass fibre reinforced unsaturated polyester hybrid composites

This study investigates the effect of fibre hybridization for sugar palm yarn fibre with glass fibre reinforced with unsaturated polyester composites. In this work, unsaturated polyester resin are reinforced with fibre at a ratio of 70:30 wt% and 60:40 wt%. The hybrid composites were characterized in terms of physical (density and water absorption), mechanical (tensile, flexural and compression) and thermal properties through thermal gravimetry analysis (TGA). Density determination showed that density increased with higher wt% of glass fibre. The inherently higher density of glass fibre increased the density of hybrid composite. Resistance to water absorption is improved upon the incorporation of glass fibre and the hybrid composites were found to reach equilibrium absorption at days 4 and 5. As for mechanical performance, the highest tensile strength, tensile modulus, flexural strength, flexural modulus and compression strength were obtained from 40 wt% of fibres reinforcement with ratio of 50:50 wt% of sugar palm yarn fibre and glass fibre reinforced unsaturated polyester composites. The increase of glass fibre loading had a synergistic effect on the mechanical properties to the composites structure due to its superior strength and modulus. The thermal stability of hybrid composites was improved by the increase of onset temperature and the reduction of residues upon increase in temperature.

Aspartic acid functionalized PEGylated MSN@GO hybrid as an effective and sustainable nano-system for in-vitro drug delivery

PurposeIn this research, aspartic acid functionalized PEGylated mesoporous silica nanoparticlesgraphene oxide nanohybrid (As-PEGylated-MSN@GO) prepared as a pH-responsive drug carrier for the curcumin delivery. For better camouflage during blood circulation, poly(ethylene glycol) was decorated on the surface of MSN@GO nanohybrid. Materials and methodsThe nanocarrier was characterized by using X-ray powder diffraction (XRD), dynamic light scattering (DLS), UV–vis spectroscopy, thermal gravimetry analysis (TGA), FT-IR, SEM and TEM. ResultsThe size of modified MSN@GO was around 75.8 nm and 24% wt. of curcumin was loaded on the final nanohybrid. pHdecrement from 7.4 to 5.8 the release medium led to increase the cumulative amount of drug release from 54% to 98%. ConclusionsAs-functionalized MSN@GO had no cytotoxicity against human breast adenocarcinoma (MCF-7) and human mammary epithelial (MCF10A) as cancerous and normal cell lines, respectively. Whereas curcuminloaded nanohybrid showed excellent killing capability against MCF-7 cells.

Synthesis of high generation thermo-sensitive dendrimers for extraction of rivaroxaban from human fluid and pharmaceutic samples

In this present study, poly (N-isopropylacrylamide) as a thermo-sensitive agent was grafted onto magnetic nanoparticles, then ethylenediamine and methylmethacrylate were used to synthesize the first generation of poly amidoamine (PAMAM) dendrimers successively and the process continued alternatively until the ten generations of dendrimers. The synthesized nanocomposite was investigated using Fourier transform infrared spectrometry, thermalgravimetry analysis, X-ray diffractometry, elemental analysis and vibrating-sample magnetometer. The particle size and morphology were characterized using dynamic light scattering, field emission scanning electron microscopy and transmission electron microscopy. Batch experiments were conducted to investigate the parameters affecting adsorption and desorption of rivaroxaban by synthesized nanocomposite. The maximum sorption of rivaroxaban by the synthesized nanocomposite was obtained at pH of 8. The resulting grafted magnetic nanoparticle dendrimers were applied for extraction of rivaroxaban from biologic human liquids and medicinal samples. The specifications of rivaroxaban sorbed by a magnetic nanoparticle dendrimer showed good accessibility and high capacity of the active sites within the dendrimers. Urine and drug matrix extraction recoveries of more than 92.5 and 99.8 were obtained, respectively.