Magnetic Modified Natural Polymers for Biotechnological Application

2014 ◽  
Vol 775-776 ◽  
pp. 738-742
Author(s):  
Elaine Aparecida Santos Carvalho ◽  
Ruben Jesus Sanchez Rodriguez ◽  
Ellen de Freitas Boa Morte ◽  
Mayara de Freitas e Castro ◽  
Darlan Silveira Marum ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Total Mass ◽  
Smooth Surface ◽  
Spherical Geometry ◽  
Biotechnological Application ◽  
Natural Polymers ◽  
Covalent Bonds ◽  
Magnetic Microparticles ◽  
Chemically Modified ◽  
Scanning Electron

Magnetic microparticles were formulated by encapsulating magnetite nanoparticles with cellulose acrylamidemetyl propionate acetate (CAPA) chemically modified with acrylamide (AM) in order to immobilize, through covalent bonds, enzymes. The microparticles were characterized by means of scanning electron microscopy and thermogravimetry. The magnetic CAPA + AM microparticles display a quite regular spherical geometry with smooth surface and a magnetite load corresponding to 11.2% of the total mass. These particles were considered as convenient supports for enzyme immobilization in biodiesel transesterification process.

Studies on Magnetron-Sputtered NiO/Si3N4 Thin Films

2018 ◽  
Vol 17 (03) ◽  
pp. 1760039
Author(s):  
K. M. Dhanisha ◽  
M. Manoj Christopher ◽  
M. Abinaya ◽  
P. Deepak Raj ◽  
M. Sridharan
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Smooth Surface ◽  
Deposition Time ◽  
Si Substrate ◽  
X Ray ◽  
Coating Time ◽  
Deposited Films ◽  
Nio Films ◽  
Scanning Electron

The present work deals with NiO/Si3N4 layers formed by depositing nickel oxide (NiO) thin films over silicon nitrate (Si3N[Formula: see text] thin films. NiO films were coated on Si3N4-coated Si substrate using magnetron sputtering method by changing duration of coating time and were analyzed using X-ray diffractometer, field emission-scanning electron microscopy, UV–Vis spectrophotometer and four-point probe method to study the influence of thickness on physical properties. Crystallinity of the deposited films increases with increase in thickness. All films exhibited spherical-like structure, and with increase in deposition time, grains are coalesced to form smooth surface morphology. The optical bandgap of NiO films was found to decrease from 3.31[Formula: see text]eV to 3.22[Formula: see text]eV with upsurge in the thickness. The film deposited for 30[Formula: see text]min exhibits temperature coefficient resistance of [Formula: see text]1.77%/[Formula: see text]C as measured at 80[Formula: see text]C.

Synthesis of Straight Y-Shaped Silica Nanorods

2008 ◽  
Vol 47-50 ◽  
pp. 367-370
Author(s):  
Guang Zhu ◽  
Xiao Ping Zou ◽  
Jin Cheng ◽  
Mao Fa Wang ◽  
Yi Su
Keyword(s):  
Electron Microscopy ◽  
Smooth Surface ◽  
Growth Direction ◽  
Si Substrate ◽  
Transmission Electron ◽  
External Conditions ◽  
Uniform Diameter ◽  
Silica Nanorods ◽  
Scanning Electron ◽  
Si Wafer

The straight Y-shaped silica nanorods have been synthesized on Si wafer by thermal chemical evaporation of mixed powders of silica and graphite at 1300°C and condensation on Si substrate without assistance of any catalyst. The synthesized samples were characterized by means of scanning electron microscopy, transmission electron microscopy. The results suggested that the straight Y-shaped silica nanorods have uniform diameter about 50-200nm and neat smooth surface. The growth of such silica nanorods may be a result of the fluctuation of external conditions causing a change in the growth direction of silica nanorods developed.

Inhalation of nail dust from onychomycotic toenails. Part I. Characterization of particles. 1984

1992 ◽  
Vol 82 (2) ◽  
pp. 111-115 ◽  
Author(s):  
C Abramson ◽  
J Wilton
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Particle Size ◽  
Total Mass ◽  
Particle Size Analysis ◽  
Dust Particles ◽  
Size Analysis ◽  
Scanning Electron

Nail dust particles were analyzed by scanning electron microscopy for size and topography. The percentage of "fines" that could be inhaled and deposited in the alveoli and bronchioles were determined by quantitative particle size analysis. Distribution representing the largest total mass was graphed between 1 and 2 microns. The authors found that 86% of nail dust would reach the bronchioles and alveoli, and 31% could be expected to deposit in these areas.

Influence of Hot Compression Moulding of Biopolymer Filled Waste Granulate Biopolymer

2013 ◽  
Vol 315 ◽  
pp. 448-452 ◽  
Author(s):  
M. Khairul Zaimy Abd Ghani ◽  
Anika Zafiah Mohd Rus
Keyword(s):  
Electron Microscopy ◽  
Ductile Fracture ◽  
Smooth Surface ◽  
Compression Moulding ◽  
Cooking Oil ◽  
Minimum Deformation ◽  
Sem Micrograph ◽  
Stress Whitening ◽  
Hot Compress ◽  
Scanning Electron

Bio-monomer based on original cooking oil was mixed with the hardeners with different percentages of Waste granulate Biopolymer (WB) fillers which is 30, 40, and 50 % equivalent to weight of monomer to produce Biopolymer filled Waste granulate Biopolymer (BWB) by using hot compress moulding. The tensile strength of BWB is 0.33, 0.45 and 0.43 MPa, meanwhile value of Youngs Modulus is 11.00, 8.18 and 5.06 MPa for loading 30, 40 and 50 % respectively. From the Scanning Electron Microscopy (SEM) micrograph, BWB has two characteristic and classified as a brittle and ductile fracture of granular (shiny) texture or cleavage character with little yielding before the sample breaks. Furthermore brittle fracture is characteristic by rapid crack propagation and then ductile fracture with stress whitening zone, appears fibrous appearance is dull and it have very rough surface. This fracture has glassy smooth surface, flat, bright, shiny and minimum deformation.

Growth and Characterization of Lithium Niobate Thin Films on Diamond/Si(100) Substrates

1998 ◽  
Vol 541 ◽  
Author(s):  
Shunxi Wang ◽  
Qingxin Su ◽  
Marc A. Robert ◽  
Thomas A. Rabson
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Scanning Electron Microscopy ◽  
Smooth Surface ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Organic ◽  
Scanning Electron ◽  
Organic Decomposition

AbstractA low temperature metal-organic decomposition process for depositing LiNbO3 thin films on diamond/Si(100) substrates is reported. X-ray diffraction studies show that the films are highly textured polycrystalline LiNbO3 with a (012) orientation. Scanning electron microscopy analyses reveal that the LiNbO3 thin films have dense, smooth surface without cracks and pores, and adhere very well to the diamond substrates. The grain size in the LiNbO3 thin films is in the range of ∼0.2-0.5 μm. The effect of the processing procedures on the surface morphology of the LiNbO3 films is investigated. Possible reasons for the elimination of microcracks in the LiNbO3 films are discussed.

Influence Factors of Calcium Carbonate Whiskers Prepared by Intermittent Bubbling Method

2013 ◽  
Vol 310 ◽  
pp. 80-84 ◽  
Author(s):  
Bei Ping Liu ◽  
Jian Chen ◽  
Fang Bo Liu ◽  
Shi Biao Zhou ◽  
Yuan Dao Chen ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Calcium Carbonate ◽  
Aspect Ratio ◽  
Smooth Surface ◽  
Influence Factors ◽  
Large Aspect Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Calcium carbonate whiskers were successfully prepared in the MgC12-Ca(OH)2-CO2 system by a intermittent bubbling method and characterized by X-ray diffraction and scanning electron microscopy. The results demonstrated that aragonite style calcium carbonate whiskers with well morphology, large aspect ratio and smooth surface can be obtained by controlling technical conditions such as reaction temperature, concentration of Ca(OH)2 and amount of additives and under the conditions of CO2 flow velocity of 3.4ml/min/gCa(OH)2, flow of CO2 to air ratio of 1:4, stirring speed of 240 r/min.

Channel Epitaxy of 3C-SiC on Si Substrates by CVD

2002 ◽  
Vol 742 ◽  
Author(s):  
S. Nishino ◽  
Y. Okui ◽  
C. Jacob ◽  
S. Ohshima
Keyword(s):  
Electron Microscopy ◽  
Epitaxial Growth ◽  
Smooth Surface ◽  
Selective Growth ◽  
Proper Selection ◽  
Si Substrates ◽  
Thermal Oxide ◽  
Interfacial Defects ◽  
Selection Of ◽  
Scanning Electron

AbstractEpitaxial growth of 3C-SiC on Si substrates has been studied for many years, however an important issue is how to reduce the high density of interfacial defects. Channel epitaxy is the growth of a film on small channeled windows and is related to selective growth. Channel epitaxy of 3C-SiC grown on the seed 3C-SiC previously deposited on patterned Si substrates was achieved via CVD using hexamethyldisilane (HMDS). The proper selection of mask materials was also key to achieve channel epitaxy. Thermal oxide, silicon nitride and thin SiC masks were tried. Thin SiC was an effective mask to achieve selective growth at 1350°C. Smooth surface morphology was observed on both the channel regions and the mask regions at the growth temperature of 1350°C. Scanning electron microscopy revealed coalescence of the laterally grown regions via channel epitaxial growth of 3C-SiC.

Adsorption of Humic Acid from Aqueous Solution Using Composite Magnetic Microspheres of Chitosan and Quaternary Ammonium Chitosan Derivative

2014 ◽  
Vol 700 ◽  
pp. 216-219 ◽  
Author(s):  
Ming De Li ◽  
Liang Wang ◽  
Bin Zhao ◽  
Yao Yao
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Humic Acid ◽  
Quaternary Ammonium ◽  
Total Mass ◽  
Magnetic Microspheres ◽  
Mass Ratio ◽  
Chitosan Derivative ◽  
Preparation Conditions ◽  
Scanning Electron

Composite magnetic microspheres of chitosan (CTS) and quaternary ammonium chitosan derivative (HTCC) were prepared by inverse suspension method. Tripolyphosphate (TPP) and glutaraldehyde were used successively to co-crosslink the microsphere matrix. The morphology was analyzed using optical microscopy and scanning electron microscopy (SEM), while the chemical composition was characterized using Fourier transform infrared spectroscopy (FTIR). The adsorption of humic acid (HA) by the composite magnetic microspheres (CHMMs) was investigated in terms of adsorption capacity and kinetics in order to optimize preparation conditions. Both CTS/HTCC mass ratio and crosslinker dosage greatly affected the properties of the microspheres. A batch of CHMMs was prepared when the mass ratio of CTS and HTCC was 1:1 and TPP and glutaraldehyde were17% and 30% of total mass of CTS and HTCC, respectively. These CHMMs were between 150 and 800 μm. 85% HA was able to be removed in 60 min using this proposed absorbent. It was fast and efficient for HA removal from aqueous solution.

scholarly journals Beauveria bassiana Xylanase: Characterization and Wastepaper Deinking Potential of a Novel Glycosyl Hydrolase from an Endophytic Fungal Entomopathogen

2021 ◽  
Vol 7 (8) ◽  
pp. 668
Author(s):  
Ayodeji Amobonye ◽  
Prashant Bhagwat ◽  
Suren Singh ◽  
Santhosh Pillai
Keyword(s):  
Electron Microscopy ◽  
Beauveria Bassiana ◽  
Specific Activity ◽  
Glycosyl Hydrolase ◽  
Insect Control ◽  
Biotechnological Application ◽  
Optimal Activity ◽  
Beechwood Xylan ◽  
Fungal Entomopathogen ◽  
Scanning Electron

Beauveria bassiana is an entomopathogenic fungus widely used as a biopesticide for insect control; it has also been shown to exist as an endophyte, promoting plant growth in many instances. This study highlights an alternative potential of the fungus; in the production of an industrially important biocatalyst, xylanase. In this regard, Beauveria bassiana SAN01 xylanase was purified to homogeneity and subsequently characterized. The purified xylanase was found to have a specific activity of 324.2 Umg−1 and an estimated molecular mass of ~37 kDa. In addition, it demonstrated optimal activity at pH 6.0 and 45 °C while obeying Michaelis–Menton kinetics towards beechwood xylan with apparent Km, Vmax and kcat of 1.98 mgmL−1, 6.65 μM min−1 and 0.62 s−1 respectively. The enzyme activity was strongly inhibited by Ag2+ and Fe3+ while it was significantly enhanced by Co2+ and Mg2+. Furthermore, the xylanase was shown to effectively deink wastepaper at an optimal rate of 106.72% through its enzymatic disassociation of the fiber-ink bonds as demonstrated by scanning electron microscopy and infrared spectroscopy. This is the first study to demonstrate the biotechnological application of a homogeneously purified glycosyl hydrolase from B. bassiana.

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