Chemical Preparation and Characterizationof Polypyrrole-Polylactic Acid Conductive Composite Membranes

2011 ◽  
Vol 335-336 ◽  
pp. 187-190
Author(s):  
Jian Jun Chen ◽  
Ji Ying Men
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Polylactic Acid ◽  
Direct Current ◽  
Chemical Method ◽  
Composite Membranes ◽  
Observation Time ◽  
Chemical Preparation ◽  
Ft Ir ◽  
Scanning Electron

Abstract: Conductive polypyrrole(PPy)-polylactic Acid(PLA) composite membranes are prepared with chemical method. Membranes have been characterized by Fouier transform infrared spectroscopic(FT-IR) and scanning electron microscopy （SEM).The conductive stability of membranes has been measured by home-made multiwell direct current electrical stimulating system. The results show PPy nanparticals network embeds in PLA matrix and the conductive stability of membranes sustains in the range of 28μA~35μA between the observation time of 560h to 1146h.

Isolasi Dan Karakterisasi Bentonit Alam Menjadi Nanopartikel Monmorillonit

2018 ◽  
Vol 3 (1) ◽  
pp. 12 ◽  
Author(s):  
Zaimahwati Zaimahwati ◽  
Yuniati Yuniati ◽  
Ramzi Jalal ◽  
Syahman Zhafiri ◽  
Yuli Yetri
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Particle Size ◽  
Surface Morphology ◽  
Average Diameter ◽  
Particle Size Analyzer ◽  
Ft Ir ◽  
Scanning Electron ◽  
Sedimentation Processes

<p>Pada penelitian ini telah dilakukan isolasi dan karakterisasi bentonit alam menjadi nanopartikel montmorillonit. Bentonit alam yang digunakan diambil dari desa Blangdalam, Kecamatan Nisam Kabupaten Aceh Utara.  Proses isolasi meliputi proses pelarutan dengan aquades, ultrasonic dan proses sedimentasi. Untuk mengetahui karakterisasi montmorillonit dilakukan uji FT-IR, X-RD dan uji morfologi permukaan dengan Scanning Electron Microscopy (SEM). Partikel size analyzer untuk menganalisis dan menentukan ukuran nanopartikel dari isolasi bentonit alam. Dari hasil penelitian didapat ukuran nanopartikel montmorillonit hasil isolasi dari bentonit alam diperoleh berdiameter rata-rata 82,15 nm.</p><p><em>In this research we have isolated and characterized natural bentonite into montmorillonite nanoparticles. Natural bentonite used was taken from Blangdalam village, Nisam sub-district, North Aceh district. The isolation process includes dissolving process with aquades, ultrasonic and sedimentation processes.  The characterization of montmorillonite, FT-IR, X-RD and surface morphology test by Scanning Electron Microscopy (SEM). Particle size analyzer to analyze and determine the size of nanoparticles from natural bentonite insulation. From the research results obtained the size of montmorillonite nanoparticles isolated from natural bentonite obtained an average diameter of 82.15 nm.</em></p>

scholarly journals A Novel Strong Cyan Luminescence Emission of Tb2O3 Particles

2021 ◽  
Author(s):  
Fatma Unal
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ammonium Carbonate ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Terbium Oxide ◽  
X Ray ◽  
Ft Ir ◽  
Pl Emission ◽  
Scanning Electron

Abstract Terbium oxide (Tb2O3) particles (NPs) were synthesized by precipitation method using ammonium carbonate as precipitation agent. Effects of precursor molarity (0.1, 0.15 and 0.2 M) on photoluminescence (PL) behaviour of the NPs were investigated. The presence of the Tb2O3 phase was confirmed by X-Ray Diffraction (XRD) and Fourier-transform infrared spectroscopy (FT-IR) analyses. Morphological investigations of the produced powders were made by Field Emission Gun-Scanning Electron Microscopy (FEG-SEM). It showed that the morphology of Tb2O3 particles transformed from the nanograin chain to bundles morphology of rod-like as the amount of precursor molarity increased. Emission spectrum were investigated by Photoluminescence (PL) Spectroscopy. All the Tb2O3 particles exhibited the strongest peak at 493 nm ascribed to 5D4-7F6 (magnetic dipole (MD), C2) transition. The increase in the number of C2 sites released from the MD transition with the increase of the precursor molarity caused a negative increase in the b* (yellowness/blueness of the emission) value in the CIE diagram, indicating that the colour shifted to the blue region. The Tb2O3 particles produced by the precipitation method exhibited novel strong cyan colour and the PL emission intensity increased with increasing molarity.

scholarly journals Φασματοσκοπική μελέτη της επίδρασης των ακτινοβολιών στον ανθρώπινο αρθρικό χόνδρο

2016 ◽  
Author(s):  
Ανδρέας Μαυρογένης
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ft Ir ◽  
Scanning Electron

Στην προύσα εργασία χρησιμοποιήθηκε η υπέρυθρη φασματοσκοπία με μετασχηματισμό Fourier σε συνδυασμό με οπτικό μικροσκόπιο υψηλή ανάλυσης και μικροσκόπιο διασποράς SEM (scanning electron microscopy) για την in vitro μελέτη της επίδρασης των ιοντιζουσών ακτινοβολιών στον αρθρικό χόνδρο, τη διεπιφάνεια με το οστούν, και για την προσέγγιση του χημικού μηχανισμού που προκαλείται κατά την ακτινοθεραπεία.Από τις μεταβολές των εντάσεων και τις νέες ταινίες στην περιοχή μεταξύ 4000-2800 cm-1, διαπιστώθηκε ότι οι βλάβες οι οποίες προκαλούνται σε μικρές δόσεις ακτινοβολίας μέχρι 6 Gy είναι οι σχάσεις των δεσμών υδρογόνου των γλυκοζαμινογλυκανών (πολυγλυκάνες, υαλουρονικό οξύ) και των κολλαγονούχων πρωτεϊνών.Τα θραύσματα του κολλαγόνου και υαλουρονικού οξέος αντιδρούν μεταξύ τους με διασταυρούμενο πολυμερισμό σχηματίζοντας προϊόντα στα οποία αποδίδεται η μείωση του ιξώδους των χόνδρων και επομένως η αύξηση της τριβής και τέλος η φθορά των χόνδρων. Τα αποτελέσματα αυτά επιβεβαιώθηκαν με σύγκριση ανάλογων χόνδρων οι οποίοι αφαιρέθηκαν από ασθενείς λόγω οστεοαρθρίτιδας ή άλλης αιτίας βλάβης του αρθρικού χόνδρου και καρκίνου.Οι μεταβολές στην περιοχή του φάσματος μεταξύ 1800-1400 cm-1, όπου εμφανίζονται οι χαρακτηριστικές δονήσεις των κολλαγονούχων πρωτεϊνών έδειξαν την καταστροφή της έλικας από α-έλικα, η οποία επικρατεί στην φυσιολογική κατάσταση, σε τυχαία περιέλιξη μετά την επίδραση των ιοντιζουσών ακτινοβολιών. Με αύξηση της δόσης ακτινοβολίας παράγονται αμυλοειδούς τύπου πρωτεΐνες από τα θραύσματα των πρωτεϊνών που παράγονται, λόγω της επίδρασης των ελευθέρων ριζών υδροξυλίου.Η εμφάνιση της ταινίας στα 1742 cm-1 αποδίδεται στην υπεροξείδωση των μεμβρανών των κυττάρων η οποία προκαλείται από την παρουσία του οξυγόνου, το οποίο, ως ελεύθερη δίριζα συμβάλλει στην περαιτέρω καταστροφή των ιοντιζουσών ακτινοβολιών. Η ταινία χαρακτηρίζει τον σχηματισμό μαλονδιαλδεΰδης, μία ένωση που αποτελεί δείκτη για την εξέλιξη της ασθένειας.Από τις ταινίες στην περιοχή του φάσματος μεταξύ 1400-900 cm-1 όπου εμφανίζονται οι χαρακτηριστικές δονήσεις των ομάδων –C-O-C- των σακχάρων διαπιστώνεται η αύξηση των D-σακχάρων, τα οποία προκύπτουν από την αύξηση των μονομερών. Οι εντάσεις των ταινιών αυτών εξαρτώνται από τη δόση ακτινοβολίας και αυξάνει αναλογικά μέχρι δόσεις περίπου 9 Gy. Πέραν αυτής της δόσης, οι παραγόμενες ελεύθερες ρίζες αντιδρούν περαιτέρω με βασικά βιομόρια και μεταβάλλουν την τοξική επίδραση της ακτινοβολίας.Στην περιοχή μεταξύ 1300-900 cm-1, οι ταινίες του φάσματος των σακχάρων συνυπάρχουν με τις ταινίες των φωσφορικών αλάτων του υδροξυαπατίτη των οστών. Από την μορφή των ταινιών και τις θέσεις των μεγίστων απορρόφησης φαίνεται ο σχηματισμός άμορφου φωσφορικού ασβεστίου [Ca3(ΡΟ4)2] ο οποίος προέρχεται από την αντίδραση των ιόντων ασβεστίου (Ca2+) του υγρού των χόνδρων με τις φωσφορικές ομάδες των φωσφολιπιδίων των κυτταρικών μεμβρανών.Τα FT-IR φάσματα συγκρίθηκαν με φάσματα ασθενών με οστεοαρθρίτιδα και διαπιστώθηκε ότι τα φάσματα παρουσιάζουν ομοιότητες, οι οποίες ερμηνεύονται με μηχανισμούς ελευθέρων ριζών.Η μελέτη της αρχιτεκτονικής των χόνδρων με οπτικό μικροσκόπιο και ηλεκτρονικό μικροσκόπιο σάρωσης (SEM) έδειξαν ότι η φθορά την οποία προκαλούν οι ιοντίζουσες ακτινοβολίες είναι ίδια με αυτή που προκαλεί η φυσιολογική γήρανση του ατόμου και εκδήλωση οστεοαρθρίτιδας.Τα δεδομένα της μελέτης δείχνουν ότι οι ιοντίζουσες ακτινοβολίες κατά την ακτινοθεραπεία προκαλούν σχάση των αλυσίδων των γλυκοζαμικογλυκανών και κολλαγονούχων πρωτεϊνών, οι οποίες οδηγούν σε μη αντιστρεπτές βλάβες. Οι παρατηρήσεις αυτές δείχνουν ότι θα πρέπει να αναπτυχθεί νέα σειρά θεραπευτικού σχήματος για την αντιμετώπιση των βλαβών, οι οποίες προκαλούνται στα υγιή κύτταρα τα οποία ακτινοβολούνται παράλληλα με τα παθολογικά.

scholarly journals Dielectric Properties of the System GdCo1-xFexO3Synthesized by Chemical Route (x = 0.10, 0.20)

2006 ◽  
Vol 3 (4) ◽  
pp. 313-328
Author(s):  
K. D. Mandal ◽  
L. Behera
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Dielectric Constant ◽  
Chemical Method ◽  
Perovskite Oxides ◽  
Space Charge Polarization ◽  
Dielectric Behavior ◽  
Dielectric Parameters ◽  
Chemical Route ◽  
Scanning Electron

The perovskite oxides GdCo1-xFexO3(x = 0.10, 0.20) were prepared by chemical method. The dielectric behavior of compositions with x = 0.10 and 0.20 in the system GdCo1-xFexO3was studied in the temperature range 300-500 K. It is observed that dielectric constant increases with increasing Fe2+ions concentration. The frequency dependence of dielectric constant in these materials indicates that space charge polarization contributes significantly to their observed dielectric parameters. A uniform distribution of grains is observed from the microstructure by Scanning electron microscopy.

Preparation and study on the optical, mechanical, and antibacterial properties of polylactic acid/ZnO/TiO2 shared nanocomposites

2020 ◽  
Vol 36 (3) ◽  
pp. 285-311
Author(s):  
Ali Tajdari ◽  
Amir Babaei ◽  
Alireza Goudarzi ◽  
Razie Partovi
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Antibacterial Activity ◽  
Optical Properties ◽  
Polylactic Acid ◽  
Field Emission ◽  
Antibacterial Properties ◽  
Hydrolytic Degradation ◽  
Scanning Electron

In this research, first, ZnO nanorods were synthesized by hydrothermal method and characterized in terms of morphological and structural properties by means of field emission scanning electron microscopy, Fourier transform infrared, and X-ray diffraction techniques. Subsequently, polylactic acid/ZnO, polylactic acid/TiO2, and polylactic acid/ZnO/TiO2 nanocomposites with different percentages of nanoparticles and two different types of ZnO morphologies were prepared and their microstructural, optical, mechanical, hydrolytic degradation, and antibacterial properties were investigated. Field emission scanning electron microscopy results of polylactic acid/ZnO and polylactic acid/TiO2 samples showed a proper dispersion and nanoparticle distribution for low percentages (up to 5 wt%) and increased aggregation for the higher percentages. Besides, a large increase in the aggregation tendency was observed for combined nanoparticles (polylactic acid/ZnO/TiO2 nanocomposites). Results of the tensile test, the UV–Vis absorption tests, and the hydrolytic degradation tests of the samples showed an enhanced mechanical (approximately 55% increase in the presence of 3–5 wt% of nanoparticles) and light absorption and degradation (approximately 85% increase in the presence of 3–10 wt% of nanoparticles) for the polylactic acid by incorporating nanoparticles. It was also observed that, in addition to the quality of dispersion and distribution of nanoparticles in the polymeric matrix, the type of morphology of nanoparticles can contribute to the improvement of these properties. The cylindrical morphology of ZnO played a greater role on improving the polylactic acid mechanical properties compared to the spherical ZnO morphology (approximately 20%). On the contrary, the increased polylactic acid optical properties and degradation with ZnO spherical morphology were more pronounced (approximately 60%). Interestingly, when both ZnO and TiO2 were added, a synergistic effect in the case of UV-shielding and degradation rate and alternatively, a detrimental effect on the mechanical properties were detected. (The polylactic acid optical properties increased by about 17% and its degradation more than doubled.) Furthermore, the antibacterial activity of polylactic acid was investigated against the two Gram-positive Listeria monocytogenes and Gram-negative bacteria Escherichia coli by incorporating nanoparticles. The results indicated that as the nanoparticle percentage increases, the antibacterial activity steadily increases.

The Characterization of Bovine Bone-Derived Hydroxyapatite Isolated Using Novel Non-Hazardous Method

2020 ◽  
Vol 45 ◽  
pp. 49-56
Author(s):  
Aniek Setiya Budiatin ◽  
Samirah ◽  
Maria Apriliani Gani ◽  
Wenny Putri Nilamsari ◽  
Chrismawan Ardianto ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Extraction Method ◽  
Bovine Bone ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Novel Method ◽  
Scanning Electron

Bovine bone is a considerable source for the production of hydroxyapatite. The recent study reported a novel method to extract hydroxyapatite from bovine bone without producing hazardous residue. The bovine bones were cut and boiled in the opened chamber followed by boiling in pressurized tank. The bones were then soaked into 95% ethanol. Calcination was then conducted in 800°C, 900°C and 1,000°C, for 2 hours. The result was then grinded and sieved. The powder then was characterized using Fourier transform infrared (FT-IR), Scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD) to measure the purity of hydroxyapatite. It is concluded that the hydroxyapatite derived from this process showed 100% purity, resulting 35.34 ± 0.39% w/w from the wet bone weight and 72.3% w/w from the dried weight. The present extraction method has been proven to yield high amount of pure hydroxyapatite as well as reducing the use of hazardous reagent.

scholarly journals A selective and easily recyclable dimer based on a calix[4]pyrrole derivative for the removal of mercury(ii) from water

RSC Advances ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 3060-3071
Author(s):  
Angela F. Danil de Namor ◽  
Salman Alharthi ◽  
Brendan Howlin ◽  
Nawal Al Hakawati
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Energy Dispersive ◽  
Ir Spectrometry ◽  
X Ray ◽  
Pyrrole Derivative ◽  
Ft Ir ◽  
Scanning Electron

A recyclable mercury(ii) selective dimer based on a calix[4]pyrrole derivative has been synthesised and characterised by mass and FT-IR spectrometry, Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray (EDX).

Characterization of banana peel by scanning electron microscopy and FT-IR spectroscopy and its use for cadmium removal

2008 ◽  
Vol 66 (2) ◽  
pp. 260-265 ◽  
Author(s):  
Jamil R. Memon ◽  
Saima Q. Memon ◽  
M.I. Bhanger ◽  
G. Zuhra Memon ◽  
A. El-Turki ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ir Spectroscopy ◽  
Banana Peel ◽  
Cadmium Removal ◽  
Ft Ir ◽  
Scanning Electron ◽  
Ft Ir Spectroscopy

Synthesis of Triethynylborazine-Polyhydromethylsiloxane Copolymers and its Ceramization

2013 ◽  
Vol 774-776 ◽  
pp. 629-633
Author(s):  
Ji Feng Jiang ◽  
Kang Kang Guo ◽  
Ya Ping Zhu ◽  
Fan Wang ◽  
Hui Min Qi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Thermogravimetric Analysis ◽  
X Ray Diffraction ◽  
Hydrosilylation Reaction ◽  
X Ray ◽  
Ft Ir ◽  
Scanning Electron

Triethynylborazine-polyhydromethylsiloxane copolymers (TEB-PHMSs) were prepared through hydrosilylation reaction between -C≡CH attached to boron and ≡Si-H. The structures of TEB-PHMSs were characterized by Fourier transform Infrared (FT-IR) and Nuclear Magnetic Resonance (NMR) spectroscopy. Their cure behavior were examined by Differential Scanning Calorimeter (DSC) and FT-IR, and then thermostability and ceramization of cured TEB-PHMS were investigated by Thermogravimetric analysis (TGA), pyrolysis-GC-MS, X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). The results indicated that TEB-PHMSs could be cured and converted into an outstanding thermostable SiBCN ceramics.

Dicyclohexylammonium bromoacetate: a low molecular mass organogelator with a one-dimensional secondary ammonium monocarboxylate (SAM) synthon

2015 ◽  
Vol 71 (7) ◽  
pp. 593-597 ◽  
Author(s):  
Tomasz Rojek ◽  
Tadeusz Lis ◽  
Ewa Matczak-Jon
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Hydrogen Bond ◽  
Ion Pairs ◽  
Asymmetric Unit ◽  
One Dimensional ◽  
X Ray ◽  
H Nmr ◽  
Ft Ir ◽  
Scanning Electron

The asymmetric unit of the title salt, C12H24N+·C2H2BrO2−, contains a dicyclohexylammonium cation connected to a bromoacetate anion by means of an N—H...O hydrogen bond. In the crystal, the ion pairs assembleviaN—H...O interactions, forming zigzag infinite chains parallel to thecaxis with the (...H—N—H...O—C—O...)nmotif that is considered to be a prerequisite for ensuring gelation properties of secondary ammonium monocarboxylate salts. The title salt was characterized by FT–IR, X-ray powder diffraction (XRPD), TG–DTA and1H NMR spectroscopy in solution. Gelation experiments revealed that dicyclohexylammonium bromoacetate forms molecular gels with dimethylformamide and dimethyl sulfoxide. Scanning electron microscopy (SEM) was used to reveal morphological features of dried gels.

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