scholarly journals Fabrication, Characterization and Degradation of Electrospun Poly(ε-Caprolactone) Infused with Selenium Nanoparticles

2021 ◽  
Vol 17 (3) ◽  
pp. 295-305
Author(s):  
Nurul Asyikin Kamaruzaman ◽  
Abdull Rahim Mohd Yusoff ◽  
Nik Ahmad Nizam Nik Malek ◽  
Marina Talib
Keyword(s):  
Chemical Properties ◽  
Average Diameter ◽  
Selenium Nanoparticles ◽  
X Ray Diffraction ◽  
Electrospinning Technique ◽  
X Ray ◽  
Hydrolysis Process ◽  
Natural Tissue ◽  
Physical And Chemical ◽  
Degradation Time

Polycaprolactone (PCL) is widely used in the fabrication of nanofibers through electrospinning technique. PCL is a biodegradable material that is economical, simple and can be scaled up for industrial production. In this study, PCL was infused with selenium nanoparticles (SeNPs) via electrospinning to fabricate PCL-SeNPs nanofiber. Field emission scanning electron microscopy (FESEM) images of the samples revealed ‘aligned fibers’ was successfully fabricated with a diameter size of less than 350 nm and an average diameter of 185 nm. The presence of Se in the nanofiber was confirmed by energy dispersive X-ray analysis (EDX) and Raman spectra. Based on the X-ray diffraction (XRD) pattern, the structure of PCL did not change and remains in the PCL-SeNPs nanofibers. The functional groups of PCL, as indicated by infrared (IR) spectra remained the same after SeNPs infusion. These results demonstrated that the physical and chemical properties of PCL nanofibers were not affected by the infusion of SeNPs. In addition, the hydrophobicity of the PCL decreased slightly in the presence of SeNPs. The first month after degradation, disorganized and fibrous fibers of PCL-SeNPs nanofiber were observed followed by the formation of large fiber clumps as degradation time increased. An agglomerated SeNPs made PCL-SeNPs nanofiber pores looser and easier to be hydrolyzed after 4 months of degradation. The sticky surface of PCL-SeNPs nanofiber shows acceleration in the hydrolysis process after 24th weeks of degradation. The presence of SeNPs enhanced the degradation behavior as well as reducing the degradation time to break into pieces, starting after 6 months of degradation. The ‘aligned’ PCL-SeNPs nanofiber, which can mimic the natural tissue extracellular matrix (ECM) morphology, can potentially be used in biomedical applications such as tissue engineering, wound dressing, biomedicine, sensor and filtration application.

Monitoring of Fluctuations in the Physical and Chemical Properties of a High-Calcium Fly Ash

1987 ◽  
Vol 113 ◽  
Author(s):  
Scott Schlorholtz ◽  
Ken Bergeson ◽  
Turgut Demirel
Keyword(s):  
Fly Ash ◽  
Chemical Properties ◽  
Operating Conditions ◽  
Physical And Chemical Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Morphological Studies ◽  
High Calcium ◽  
Physical And Chemical ◽  
And Chemical Properties

ABSTRACTThe physical and chemical properties of fly ash produced at Ottumwa Generating Station have been monitored since April, 1985. The fly ash is produced from burning a low sulfur, sub-bituminous coal obtained from the Powder River Basin near Gillette, Wyoming. One-hundred and sixty samples of fly ash were obtained during the two year period. All of the samples were subjected to physical testing as specified by ASTM C 311. About one-hundred of the samples were also subjected to a series of tests designed to monitor the self-cementing properties of the fly ash. Many of the fly ash samples were subjected to x-ray diffraction and fluorescence analysis to define the mineralogical and chemical composition of the bulk fly ash as a function of sampling date. Hydration products in selected hardened fly ash pastes, were studied by x-ray diffraction and scanning electron microscopy. The studies indicated that power plant operating conditions influenced the compressive strength of the fly ash paste specimens. Mineralogical and morphological studies of the fly ash pastes indicated that stratlingite formation occurred in the highstrength specimens, while ettringite was the major hydration product evident in the low-strength specimens.

Characterization of Shivirtui Zeolite Modified with Aluminum Oxyhydroxide Nanofibers

2019 ◽  
Vol 942 ◽  
pp. 40-49
Author(s):  
Yulia Murashkina ◽  
Olga B. Nazarenko
Keyword(s):  
Chemical Properties ◽  
Nitrogen Adsorption ◽  
X Ray Diffraction ◽  
Scanning Electronic Microscopy ◽  
Electronic Microscopy ◽  
X Ray ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Aluminum Oxyhydroxide

Natural zeolite of Shivirtui deposit (Russia) was modified with nanofibers of aluminum oxyhydroxide AlOOH. Aluminum oxyhydroxide nanofibers were produced at the heating and oxidation of aluminum powder with water. The properties of modified zeolite were investigated by means of X-ray diffraction, transmission electronic microscopy, scanning electronic microscopy, low-temperature nitrogen adsorption, thermal analysis, and Fourier transform infrared spectroscopy. It was found that water content in the modified sample of zeolite was about 15 %. Based on the study of the physical and chemical properties, shivirtui zeolite modified with nanofibers of aluminum oxyhydroxide can be proposed for use as a flame-retardant additive to polymers.

Preparation and Evaluation of Nano-Hydroxyapatite/β-Tricalcium Phosphate/Chitosan Composite Scaffolds for Bone Tissue Engineering

2007 ◽  
Vol 361-363 ◽  
pp. 463-466
Author(s):  
T. Lin ◽  
S.M. Zhang ◽  
J. Li ◽  
L. Zhang ◽  
Y.H. Liu ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
X Ray Diffraction ◽  
Composite Scaffolds ◽  
X Ray ◽  
Viable Cells ◽  
Physical And Chemical ◽  
Chitosan Composite ◽  
Preparation And Evaluation ◽  
And Chemical Properties

The composite scaffolds with nine different ratios of nano-HA and ß-TCP content were fabricated by using lyophilization method. Their microscopy, physical and chemical properties were investigated by using scanning electron microscopy (SEM), X-ray diffraction (XRD), and fourier transformed infrared (FTIR) spectroscopy. MTT test was applied to quantitatively assess the number of viable cells attached and grown on the scaffolds. And the result showed that the amount of cells on the scaffold containing 30% by mass of nano-HA was significantly higher than the other samples.

Physical and Chemical Properties of Mineral in Soils of Cassava Cropping Area: A Case Study in Chonburi Province

2014 ◽  
Vol 979 ◽  
pp. 440-443
Author(s):  
W. Siriprom ◽  
K. Teanchai ◽  
S. Kongsriprapan ◽  
J. Kaewkhao ◽  
N. Sangwaranatee
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Chemical Properties ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Physical And Chemical ◽  
And Chemical Properties

The chemical and physical properties of topsoil and subsoil which collected from the cassava cropping area in Chonburi Province have been investigated. The characterization of both soil sample were used X-Ray Diffraction (XRD), Energy Dispersive X-Ray Fluorescence (EDXRF) while FTIR used to confirmed the formation of intermolecular bonding and Thermo-Gravimetric Analysis (TGA) used for investigated the crystalline. It was found that, the XRD pattern indicated quartz phase. The chemical composition by XRF reported that the soils samples consist of Si, Al, Ca, Fe, K, Mn, Ti, Cr, Zn, Ag and Cu. and TGA results, noticed that the removal of moisture and organics material.

scholarly journals Change of physical and chemical properties clinoptilolite after mechanical activation

2015 ◽  
Vol 11 (2) ◽  
pp. 58-61
Author(s):  
Anastasiya G Bebiya ◽  
Pavel Y Gulyaev ◽  
Irina V Milyukova
Keyword(s):  
Mechanical Activation ◽  
Chemical Properties ◽  
Optimal Time ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sorption Ability ◽  
Maximum Sorption ◽  
Activation Times ◽  
Physical And Chemical ◽  
And Chemical Properties

Presents experimental data depending on the specific surface area and sorption properties of the clinoptilolite powder mechanical activation times. Carried out X-ray diffraction and spec-troscopic analysis of mechanically activated zeolite. Find the optimal time and mechanical activation modes which relate the maximum sorption ability.

scholarly journals ESTUDO DA QUÍMICA DE SUPERFÍCIE PARA SELEÇÃO DE PROTETIVOS HIDRORREPELENTES E SUPORTE TECNOLÓGICO PARA CONSERVAÇÃO E RESTAURO DE BENS PÉTREOS

2016 ◽  
Author(s):  
Daniel Silva Barbutti ◽  
Roberto Carlos da Conceição Ribeiro
Keyword(s):  
Zeta Potential ◽  
Protective Coatings ◽  
Chemical Properties ◽  
X Ray Diffraction ◽  
Technological Support ◽  
X Ray ◽  
Before And After ◽  
Ph Range ◽  
Physical And Chemical ◽  
Selection Of

ResumoNeste estudo foram avaliadas as interações entre três representantes minerais constituintes das rochas ornamentais graníticas (quartzo, microclina e muscovita) e três protetivos comerciais com propriedades hidrorrepelentes. Os minerais foram caracterizados química e mineralogicamente por análises de fluorescência e difração de Raios-X (FRX e DRX, respectivamente), enquanto os protetivos foram caracterizados por meio de espectroscopia de infravermelho com transformada de Fourier (FTIR). Para avaliação da eficácia dos protetivos, foram realizados estudos de mobilidade eletroforética a partir da avaliação do potencial zeta dos minerais em função do pH, antes e após tratamento com cada produto. Os resultados indicaram melhor desempenho do protetivo a base de siloxano, reduzindo a eletronegatividade da superfície de todos os minerais, principalmente na faixa levemente ácida de pH entre 3 e 6, onde ocorrem os principais intemperismos capazes de alterar as propriedades físico-químicas de rochas expostas em centros urbanos. Foram visualizadas reduções médias de até 15mV para quartzo, 5 mV para muscovita e 20 mV para microclina. Análises prévias das rochas de um monumento e dos protetivos inicialmente elegidos para proteção são importantes para a correta conservação e restauro dos bens pétreos que resguardam seus valores artísticos e culturais. Palavras Chave: conservação e restauro, potencial zeta, mineral AbstractSURFACE CHEMISTRY STUDY FOR THE SELECTION OF HYDRORPEPEAL PROTEINS AND TECHNOLOGICAL SUPPORT FOR CONSERVATION AND RESTORATION OF STONE ASSETS. Interactions between the main minerals that compose the granitic dimension stones (quartz, microcline and muscovite) and three commercial hydrophobic protective coatings were investigated in this study. The minerals were characterized chemically and mineralogically through fluorescence X-ray analysis (XRF) and X-ray diffraction (XRD) respectively, while the protective coatings were characterized by Fourier transform infrared spectroscopy (FTIR). The interactions between minerals and protective coatings were evaluated by zeta potential measurements of the minerals as a function of pH before and after surface treatment with each product. The results showed that only one protective coating was able to reduce the electronegativity in all mineral samples, especially in mildly acidic pH range, where several outdoor weathering effects occur, modifying the physical and chemical properties of stone-built monuments in urban environment. Previous analysis of the stones that constitute the monument as well as preselected products for its treatment are considered important to guide the proper conservation and restoration of stone-built cultural heritages that enshrine their artistic and historical values. Keywords: conservation & restoration, zeta potential, mineral

Synthesis and characterization of a composite organic semiconductor (curcumin-paracetamol/TiO2)

2020 ◽  
pp. 096739112092169
Author(s):  
Asmaa Bouazza ◽  
Salah Bassaid ◽  
Bouabdallah Daho ◽  
Massimo Messori ◽  
Abdelkader Dehbi
Keyword(s):  
Organic Semiconductor ◽  
Chemical Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Production Water ◽  
Synthesis Methodology ◽  
Physical And Chemical ◽  
Electronic And Structural Properties ◽  
And Chemical Properties

The aim of this work is to study some physical and chemical properties of an organic semiconductor (OSc)/ x%titanium dioxide (TiO2) heterosystem (with 0 ≤ x ≤ 20%) (OScs/ x%TiO2). The OSc is obtained from pure curcumin and paracetamol as starting molecules. The synthesis methodology of the mixtures of OScs/ x%TiO2 heterosystem involves a microwave-assisted multicomponent reaction using curcumin, paracetamol, and TiO2 as a heterogeneous solution. All mixtures were analyzed by Fourier-transform infrared spectroscopy, Raman spectroscopy, thermogravimetric analysis/differential thermal analysis, X-ray diffraction, ultraviolet–visible spectroscopy, and scanning electron microscopy. The results obtained show a new nanocomposite with interesting pharmaceutical, optical, electronic, and structural properties, which can be used in the fields of energy production, water purification, and air purification, as a biomaterial and for electronic applications.

Investigating the properties and performance of 3A molecular sieves as an adsorbent to prevent coke formation in olefin dehydration process

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Zoya Moslempour ◽  
Sepehr Sadighi ◽  
Ali Dashti ◽  
Ali Ahmadpour
Keyword(s):  
Molecular Sieves ◽  
Molecular Sieve ◽  
Coke Formation ◽  
Chemical Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Na Ions ◽  
Temperature Programmed ◽  
And Performance ◽  
Physical And Chemical

Abstract To study the affinity of 3A aluminosilicate adsorbents to prevent oligomerization of olefin molecules and forming green oil, physical and chemical properties of 3A molecular sieves are measured by using characterization techniques such as temperature-programmed desorption (TPD), nitrogen (N2) and water adsorptions, X-ray diffraction (XRD), X-ray fluorescence (XRF), crushing strength, and carbon dioxide (CO2) adsorption. Moreover, coke formation affinities of the understudy adsorbents are evaluated in a bench-scale system using 1-butene and 1,3-butadiene at temperatures of 220 and 260 °C, and outcomes are validated against the actual data gathered from an industrial scale olefin dehydration plant. Results confirm that the type of binder and the amount of ion exchange affect the performance of a 3A molecular sieve nominated for dehydrating olefinic streams. The binder with the least amount of acidity is preferred, and at least 35% of Na ions of the 4A zeolite should be exchanged with K ions to make it applicable for synthesizing an appropriate 3A molecular sieve. Furthermore, to control the oligomerization and inhibit green oil formation, the CO2 adsorption and acidity of Trisiv shape molecular sieves with the sizes of 1/4 inch should be less than 0.5 wt % and 1.7 mmol NH3/g, respectively. For extrudate shape with the sizes of 1/16 inch CO2 adsorption and acidity should be less than 0.2 wt % and 2.2 mmol NH3/g, respectively.

Synthesis and Characterization of Cassava Starch Nanocrystals by Hydrolysis Method

2015 ◽  
Vol 1113 ◽  
pp. 446-452 ◽  
Author(s):  
Nur Shazrynda Md Shahrodin ◽  
Abdul Razak Rahmat ◽  
Agus Arsad
Keyword(s):  
Chemical Properties ◽  
Cassava Starch ◽  
High Yield ◽  
X Ray Diffraction ◽  
Hydrolysis Method ◽  
Transmission Electron ◽  
Hydrolysis Process ◽  
20 Nm ◽  
Physical And Chemical ◽  
Starch Nanocrystals

Cassava starch nanocrystals (CSN) has not been reported in open literature, although other starches such as rice, corn, potato and bean were widely used as the main material. Thus, the objective of this research was to investigate the possibility of synthesizing high yield of CSN at different concentration of sulphuric acid (H2SO4). The physical and chemical properties of synthesize CSN was also investigated. Synthesized CSN was prepared by hydrolysing native cassava starch (NCS) with several concentration of H2SO4 (2.8 M, 3.0 M, 3.2 M and 3.4 M). The acid hydrolysis process took five days with continuous stirring speed of 300 to 400 rpm, with constant temperature of 37 °C. The hydrolysed solution of CSN underwent centrifuging process with distilled water until neutral to make sure that no acid residues remain in the CSN solution. The CSN precipitate was dried in an oven over night at 60 °C. The highest yield (1.1 %) produced was from 3.4 M CSN. Morphology test by Transmission Electron Microscopy indicated that the samples have been destructed and degraded to be nanocrystals with a size range of 5 - 20 nm. X-ray Diffraction (XRD) and 13C Nuclear Magnetic Resonance (NMR) were used to indicate the type of crystallinity for both NCS and CSN.

Sign in / Sign up

Export Citation Format

Share Document