scholarly journals Sintesis Nanofiber PVP dengan Ekstrak Basella rubra Linn. Menggunakan Metode Elektrospinning

2021 ◽  
Vol 5 (1) ◽  
pp. 55
Author(s):  
Wulandari Kusuma Dewi ◽  
Defi Nur Indahsari ◽  
Okky Putri Prastuti ◽  
Eka Lutfi Septiani
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Healing Process ◽  
Aluminum Foil ◽  
Taylor Cone ◽  
Diameter Distribution ◽  
Wound Healing Process ◽  
Electrospinning Method ◽  
The Impact ◽  
Scanning Electron

Pembalut luka alternatif dari lembaran serat nano telah dikembangkan baru-baru ini. Aktivitas antioksidan dan antibakteri berperan penting dalam proses penyembuhan luka. Penelitian ini bertujuan untuk menggabungkan sifat ekstrak Bassela rubra Linn. (EBRL) menjadi serat nano polivynil pyrrolidone (PVP) dengan metode elektrospinning. Langkah pertama yang dilakukan adalah menimbang Bassela rubra L. sebanyak 8 gram dan membungkus kedalam kertas saring. Kemudian diekstraksi dengan menggunakan etanol 99% sebagai pelarut pada suhu ± 78 oC. Langkah selanjutnya adalah membuat nanofiber dengan metode elektrospinning dengan menimbang PVP (Polivinil pirrolidon) sebanyak 8%wt. Menambahkan ekstrak Bassela rubra L. sebanyak 2%wt, 5%wt dan 8%wt pada larutan kedalam jarum suntik. Lalu mengatur laju alir 1 mL/jam, jarak antara spineret dengan kolektor 10 cm, dan tegangan 12kV. Dalam pengaplikasian nanofiber dengan EBRL diperlukan ukuran serat tertentu, maka dalam penelitian ini dilakukan pengamatan dampak komposisi EBRL terhadap diameter dan distribusinya. Metode ini dimulai dengan menginjeksikan larutan PVP dan EBRL dengan berbagai komposisi menuju kolektor dalam seperangkat alat elektrospinning. Morfologi nanopartikel telah dianalisa menggunakan metode Scanning Electron Microscopy (SEM). Perbedaan komposisi EBRL memberikan diameter dan distribusi diameter yang berbeda-beda. Hal ini dapat dipengaruhi oleh bentuk Taylor Cone dari larutan yang diinjeksikan.An alternative wound dressing based on nanofiber mats have been developed recently. The antioxidant and antibacterial activity play an important role in wound healing process. This study aims to combine the properties of Bassela rubra Linn. (EBRL) extract into polivynil pyrrolidone (PVP) nanofibers using the electrospinning method. The first step is to weigh 8 grams of basella rubra linn and wrap it in filter paper. Then extracted using 99% ethanol as a solvent at a temperature of ± 78 oC. The next step is to make nanofibers using the electrospinning method by weighing 8% wt of PVP (Polyvinyl pyrrolidone). Basella rubra linn extract as much as 2% wt, 5% wt and 8% wt in the solution into a syringe. Then assistance with the flow rate of 1 mL / hour, the distance between the spineret and the collector is 10 cm, coating the collector with aluminum foil, and providing 12kV voltage assistance. In the application of nanofibers with EBRL, a certain fiber size is required, so in this study, we observed the impact of EBRL on its diameter and distribution. This method begins by injecting PVP and EBRL solutions of various compositions into the collector in a set of electrospinning devices. The morphology of the nanoparticles was analyzed using the Scanning Electron Microscopy (SEM) method. Differences in the composition of EBRL provide different diameter and diameter distribution. This can be constructed by the Taylor Cone form of the solution that is injected.

Effect of inorganic nanofillers on the impact behavior and fracture probability of industrial high-density polyethylene nanocomposite

2017 ◽  
Vol 52 (18) ◽  
pp. 2431-2442 ◽  
Author(s):  
Harun Sepet ◽  
Necmettin Tarakcioglu ◽  
RDK Misra
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Density Polyethylene ◽  
Fracture Probability ◽  
High Density ◽  
Impact Behavior ◽  
Inorganic Filler ◽  
Melt Mixing ◽  
The Impact ◽  
Scanning Electron

The main purpose of this work is to study how the morphology of nanofillers and dispersion and distribution level of inorganic nanofiller influence the impact behavior and fracture probability of inorganic filler filled industrial high-density polyethylene nanocomposites. For this study, nanoclay and nano-CaCO3 fillers–high-density polyethylene mixings (0, 1, 3, 5 wt.% high-density polyethylene) was prepared by melt-mixing method using a compounder system. The impact behavior was examined by charpy impact test, scanning electron microscopy, and probability theory and statistics. The level of the dispersion was characterized with scanning electron microscopy energy dispersive X-ray spectroscopy analysis. The results showed rather good dispersion of both of inorganic nanofiller, with a mixture of exfoliated and confined morphology. The results indicated that the impact strength of the industrial nanocomposite decreased with the increase of inorganic particulate content. The impact reliability of the industrial nanocomposites depends on the type of nanofillers and their dispersion and distribution in the matrix.

The Impact Properties of a Polyurethane Composite Filled with Clay

2011 ◽  
Vol 197-198 ◽  
pp. 1100-1103
Author(s):  
Jian Li
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Mechanical Analysis ◽  
Impact Testing ◽  
Impact Properties ◽  
Polyurethane Composite ◽  
The Matrix ◽  
The Impact ◽  
Scanning Electron

A polyurethane/clay (PU/clay) composite was synthesized. The microstructure of the composite was examined by scanning electron microscopy. The impact properties of the composite were characterized by impact testing. The study on the structure of the composite showed that clays could be dispersed in the polymer matrix well apart from a few of clusters. The results from mechanical analysis indicated that the impact properties of the composite were increased greatly in comparison with pure polyurethane. The investigation on the mechanical properties showed that the impact strength could be obviously increased by adding 20 wt% (by weight) clay to the matrix.

scholarly journals Microstructure–Property Relationship of Polyurethane Foams Modified with Baltic Sea Biomass: Microcomputed Tomography vs. Scanning Electron Microscopy

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5734
Author(s):  
Paulina Kosmela ◽  
Jan Suchorzewski ◽  
Krzysztof Formela ◽  
Paweł Kazimierski ◽  
Józef Tadeusz Haponiuk ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Baltic Sea ◽  
Thermal Insulation ◽  
Reference Sample ◽  
Microcomputed Tomography ◽  
Polyurethane Foams ◽  
Relationship Of ◽  
The Impact ◽  
Scanning Electron

In this paper, novel rigid polyurethane foams modified with Baltic Sea biomass were compared with traditional petro-based polyurethane foam as reference sample. A special attention was focused on complex studies of microstructure, which was visualized and measured in 3D with high-resolution microcomputed tomography (microCT) and, as commonly applied for this purpose, scanning electron microscopy (SEM). The impact of pore volume, area, shape and orientation on appearance density and thermal insulation properties of polyurethane foams was determined. The results presented in the paper confirm that microcomputed tomography is a useful tool for relatively quick estimation of polyurethane foams’ microstructure, what is crucial especially in the case of thermal insulation materials.

scholarly journals Effects of Droplet-Vitrification Cryopreservation Based on Physiological and Antioxidant Enzyme Activities ofBrassidiumShooting Star Orchid

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Safrina Rahmah ◽  
Safiah Ahmad Mubbarakh ◽  
Khor Soo Ping ◽  
Sreeramanan Subramaniam
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Liquid Nitrogen ◽  
Enzyme Activities ◽  
Structural Changes ◽  
Total Soluble Protein ◽  
Antioxidant Enzyme Activities ◽  
Droplet Vitrification ◽  
The Impact ◽  
Scanning Electron

Protocorm-like bodies (PLBs) ofBrassidiumShooting Star orchid were successfully cryopreserved using droplet-vitrification method. Vitrification based cryopreservation protocol is comprised of preculture, osmoprotection, cryoprotection, cooling, rewarming, and growth recovery and each and every step contributes to the achievement of successful cryopreservation. In order to reveal the lethal and nonlethal damage produced by cryopreservation, histological observation, scanning electron microscopy (SEM), and biochemical analysis were carried out in both cryopreserved and noncryopreserved PLBs ofBrassidiumShooting Star orchid comparing with the control PLBs stock culture. Histological and scanning electron microscopy analyses displayed structural changes in cryopreserved PLBs due to the impact of cryoinjury during exposure to liquid nitrogen. Total soluble protein significantly increased throughout the dehydration process and the highest value was achieved when PLBs were stored in liquid nitrogen. Ascorbate peroxidase (APX) and catalase (CAT) showed the highest enzyme activities in both dehydration and cryostorage treatments indicating that stress level of PLBs was high during these stages.

POLYAMIDE/POLYESTERAMIDE BASED NANOFIBERS

2011 ◽  
Vol 04 (04) ◽  
pp. 365-368 ◽  
Author(s):  
LENKA MALINOVÁ ◽  
VÁCLAVA BENEŠOVÁ ◽  
DANIELA LUBASOVÁ ◽  
LENKA MARTINOVÁ ◽  
JAN RODA ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aspect Ratio ◽  
Polymer Solution ◽  
High Aspect Ratio ◽  
Electrospinning Method ◽  
Microscopy Images ◽  
Scanning Electron

The formation of novel high aspect ratio nanofibers from polyesteramides based on ε-caprolactam and ε-caprolactone is reported. Nanofibers were prepared by the electrospinning method from polymer solution. Scanning electron microscopy images of nanofiber layers revealed that the diameter of fibers depended on the nature of the solvent or the mixture of solvents used and especially on the composition of polyesteramides.

Preparation of Polyurethane (PU)/ Polyaniline (PANI) Compound Nanofiber via Electrospinning

2011 ◽  
Vol 332-334 ◽  
pp. 1352-1356
Author(s):  
Li Wei Liu ◽  
Wei Min Kang ◽  
Bo Wen Cheng
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electrospun Nanofibers ◽  
Total Solid ◽  
Solution Concentration ◽  
Solid Content ◽  
Diameter Distribution ◽  
Mass Ratio ◽  
Total Solid Content ◽  
Scanning Electron

In this paper polyurethane (PU) / polyaniline (PANI) nanofibers were successfully prepared via electrospinning with N, N-dimethylformamide (DMF) and tetrahydrofuran (THF) mixture (1:2 mass ratio). The morphology, diameter and structure of the electrospun nanofibers were examined by scanning electron microscopy (SEM) and the diameter distribution of nanofibers was measured by Image-Pro Plus. Results indicate that the morphology, diameter and uniformity of the fibers were influenced by solution concentration, applied voltage, capillary–screen distance and flow rate greatly, and the finer and uniform nanofibers were electrospun from total solid content of the spinning solutions at 8 wt. %, PU and PANI with ratio of 10/1 (w/w), the spinning voltage at 35 kV, the collecting distance at 15 cm and the extruding speed at 6 ml/h.

scholarly journals MICRO-MECHANICAL PERFORMANCE OF CONCRETE USED AS RECYCLED RAW MATERIAL IN CEMENTITIOUS COMPOSITE

2017 ◽  
Vol 13 ◽  
pp. 55 ◽  
Author(s):  
Vladimír Hrbek ◽  
Veronika Koudelková ◽  
Zdeněk Prošek ◽  
Pavel Tesárek
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Industrial Pollution ◽  
Mechanical Performance ◽  
Structural Parameters ◽  
Raw Material ◽  
Cementitious Composite ◽  
X Ray ◽  
The Impact ◽  
Scanning Electron

The reduction of industrial pollution is recently one of main goals over all fields. In civil engineering, re-cycling of structural waste provides wide opportunity contributing this effort. This paper focus on re-use of concrete waste, which after further processing can be used in new constructions as partial supplement to the mixture. To investigate the impact of re-cycled concrete addition, it is necessary to determine mechanical and structural parameters of individual phases in the “raw” material. For this purpose, grid indentation and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM, EDX) are combined to determine properties of concrete sample.

Preparation of Polyacrylamide Nanofibers by Electrospinning

2009 ◽  
Vol 87-88 ◽  
pp. 433-438 ◽  
Author(s):  
Li Liu ◽  
Wei Wei Gu ◽  
Wen Ting Xv ◽  
Chang Fa Xiao
Keyword(s):  
Electron Microscopy ◽  
Molecular Weight ◽  
Scanning Electron Microscopy ◽  
Applied Voltage ◽  
Diameter Distribution ◽  
Uniform Thickness ◽  
Technological Parameters ◽  
Glutaraldehyde Solution ◽  
Scanning Electron

Polyacrylamide (PAM) nanofibers was spun by electrospinning. In order to increase the molecular weight of the PAM, It has been cross linked by Glutaraldehyde solution. By means of scanning electron microscopy (SEM), the effect of electrospun technological parameters on the fibers’ morphology were researched. The parameters include the concentration of PAM spinning solution, the applied voltage and tip-collector distance (TCD). The PAM nanofibers of uniform thickness with the fibers’ diameter distribution of 80 ~ 160nm were got under the conditions as followers: the concentration of 16 wt.%, applied voltage of 23 kV, the TCD of 13cm.

The Occurrence of Copper-Psoromic Acid in Lichens From Cupriferous Substrata

1990 ◽  
Vol 22 (3) ◽  
pp. 345-354 ◽  
Author(s):  
O. William Purvis ◽  
John A. Elix ◽  
Kim L. Gaul
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Infrared Absorption ◽  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
The Other ◽  
Infrared Absorption Spectroscopy ◽  
Acid Complex ◽  
The Impact ◽  
Scanning Electron

AbstractThe localization of psoromic acid and copper in partly green, copper-rich specimens of Lecidella bullata and Tephromela testaceoatra collected in Norway was studied by optical microscopy, scanning electron microscopy, and electron probe microanalysis. Infrared absorption spectroscopy of lichen material and of a synthetic copper-psoromic acid complex, and the other techniques, provide evidence that complexing of copper by psoromic acid occurs within specific areas of these lichens and this leads to their unusual colouration. In contrast, a specimen of copper-rich Lecanora cascadensis, which contains psoromic and usnic acids, does not contain such a complex. From the evidence obtained it is suggested that taxonomists should pay attention to the impact of rock and lichen chemistry on the appearance of lichen thalli.

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