Preparation and characterization of hydrothermally pretreated bamboo powder with improved thermoplasticity by propargyl bromide modification in a heterogeneous system

2021 ◽  
Author(s):  
En-Qing Zhu ◽  
Gao-Feng Xu ◽  
Xin-Yao Ye ◽  
Jing Yang ◽  
Hai-Yan Yang ◽  
...  
Keyword(s):  
Heterogeneous System ◽  
Propargyl Bromide ◽  
Bamboo Powder

Characterization of Pyrolytic Char after Chemical Activation

2012 ◽  
Vol 485 ◽  
pp. 369-372
Author(s):  
Xiu Juan Guo ◽  
Shu Rong Wang
Keyword(s):  
Chemical Activation ◽  
Catalyst Support ◽  
Fast Pyrolysis ◽  
Fixed Carbon ◽  
Surface Areas ◽  
Before And After ◽  
Pyrolytic Char ◽  
Bamboo Powder ◽  
Degree Of Graphitization

In this study, the pyrolytic char from fast pyrolysis of bamboo powder was activated with KOH solvent at 500, 600 and 700°C. And the characterization of chars before and after activation was carried out by means of N2 physisorption, XRD, FTIR and SEM. A better porous structure of activated chars was found. Compared with pyrolytic char, activated chars had higher fixed carbon content and BET surface areas, and fewer active functional groups on the surface to increase the degree of graphitization. With the temperature increasing, the activated char became much more suitable as the substitute of commercial activated carbon. Therefore, the char activated at 700°C was most stable and had the best properties as catalyst support and absorbent material

scholarly journals PHYSICAL PROPERTIES AND MICROSTRUCTURE OF PARTICLE BOARDS BASED ON PALM OIL PALM EMPTY FRUITS AND BAMBOO POWDER WITH A MIXED ADHESIVE OF GAMBIR AND UREA FORMALDEHYDE

2021 ◽  
Vol 5 (1) ◽  
pp. 21
Author(s):  
Nanda Putri Afrilda ◽  
Ety Jumiati ◽  
Abdul Halim Daulay
Keyword(s):  
Oil Palm ◽  
Urea Formaldehyde ◽  
Microstructural Analysis ◽  
Hot Press ◽  
Drying Time ◽  
Empty Fruit Bunches ◽  
Test Parameters ◽  
Board Surface ◽  
Bamboo Powder

This test was carried out to reduce waste in coconut empty fruit bunches and to determine the characteristics and microstructure of the particle board surface.  The samples used consisted of bamboo powder and oil palm empty fruit bunches with gambier adhesive and urea formaldehyde with variations including: 10%:75%:15%:11%;  20%:65%:15%:11%, 30%:55%:15%:11%, 40%:45%:10%:11%.  The particleboard was printed and pressurized using a hot press of 16kg/cm2 for 15 minutes at a temperature of 120 oC, with a drying time of 14 days.  The test parameters include: density, moisture content, thickness expansion, and microstructural analysis using SEM (Scanning Electron Microscopy) which refers to SNI 03-2105-2006.  The characterization of particleboard produced in the density test is 0.66-0.74 g/cm3, the water content value is 2.4-6.9%, the thickness expansion value is 7.2-12%.  Based on the percentage value of the density of the resulting particleboard is a medium density particleboard.

Synthesis, characterization of active Sn(0), and its application in selective propargylation of aldehyde at room temperature in water

2019 ◽  
Vol 97 (1) ◽  
pp. 29-36 ◽  
Author(s):  
Paresh Nath Chatterjee ◽  
Dipankar Paul ◽  
Micky Lanster Sawkmie ◽  
Arun Kumar Sinha ◽  
Snehadrinarayan Khatua
Keyword(s):  
Carboxylic Acid ◽  
Functional Groups ◽  
Room Temperature ◽  
Chemical Reduction ◽  
Inert Atmosphere ◽  
Reducing Agent ◽  
Distilled Water ◽  
Propargyl Bromide ◽  
High Yields

Active Sn(0) particles are synthesized in high yields by the chemical reduction of the blue–black stannous oxide using freshly prepared sodium stannite solution as reducing agent at 40 °C and 60 °C. The Sn(0) particles are characterized using powder XRD, SEM, and DSC. The as-synthesized Sn(0) particles are applied as reagent for the regioselective synthesis of homopropargyl alcohols from propargyl bromide and aldehydes in distilled water at room temperature (in 50%–84% yields). No assistance of heat, microwave, ultrasound, organic co-solvent, co-reagent, or inert atmosphere is required for this reaction. The propargylation reaction is highly chemoselective towards aldehyde over other less electrophilic carbonyl functional groups such as ketone, amide, and carboxylic acid. Our in-house synthesized homopropargyl alcohols can be used to synthesize conjugated 1,3-diynes.

scholarly journals Synthesis and Characterization of Some New Nucleoside Analogues from Substituted Benzimidazole via 1,3-Dipolar cycloaddition

2016 ◽  
Vol 13 (2) ◽  
pp. 298-306
Author(s):  
Baghdad Science Journal
Keyword(s):  
Benzoic Acid ◽  
Benzimidazole Derivative ◽  
Cycloaddition Reaction ◽  
Nucleoside Analogues ◽  
Dipolar Cycloaddition ◽  
Synthesis And Characterization ◽  
Propargyl Bromide ◽  
Sugar Moiety ◽  
Ft Ir

This paper includes the synthesis of some new nucleoside analogues starting with 2-substituted benzimidazole derivative (7-9), that synthesized by condensation of O-phenylenediamine with p-chloro benzaldehyde and two substituted benzoic acid , which on nucleophilic substitution with propargyl bromide gave a new N-substituted compounds (10-12). D-Fructose and D-galactose were chosen as a sugar moiety which were protected, brominated and azotated to give azido sugars (5) and (6), then they were subjected to 1,3-dipolar cycloaddition reaction with N-substuted compounds afforded bloked nucleoside analoges (13-16), which after hydrolysis gave our target the free nucleoside analogues (17-20). All prepared compounds were identified by FT-IR and some of them with 1H-NMR and 13C-NMR.

Characterization of propargyl bromide transformation in soil

2002 ◽  
Vol 58 (10) ◽  
pp. 1055-1062 ◽  
Author(s):  
Sharon K Papiernik ◽  
Jianying Gan ◽  
Scott R Yates
Keyword(s):  
Propargyl Bromide

Combining PFG and CPMG NMR measurements for separate characterization of oil and water simultaneously present in a heterogeneous system

2003 ◽  
Vol 24 (1) ◽  
pp. 41-53 ◽  
Author(s):  
J. G. Seland ◽  
G. H. Sørland ◽  
H. W. Anthonsen ◽  
J. Krane
Keyword(s):  
Heterogeneous System

scholarly journals Chemical and Isotopic Tracers for Characterization of the Groundwater in the Heterogeneous System: Case from Chichaoua-Imin’tanout (Morocco)

Water ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 9
Author(s):  
Rim Tijani ◽  
Abdennebi El Mandour ◽  
Driss Chafouq ◽  
Malak Elmeknassi ◽  
Fatima Ezzahra El Ghazali ◽  
...  
Keyword(s):  
Heterogeneous System ◽  
Major Elements ◽  
Water Infiltration ◽  
Isotopic Tracers ◽  
Piper Diagram ◽  
Vertical Heterogeneity ◽  
Aquifer Characteristics ◽  
Calcium And Magnesium ◽  
Definition Of

The geological and hydrogeological approach of the structure of the basin OuladBouSbaâ led to the definition of the geometry of the main aquifers. In general, the profiles show the complexity of the geological configuration. The filling of the depression of OuladBouSbaâ is from the Eo-Cretacian. At this level, the aquifer is recharged by direct water infiltration. The quaternary, Eocene, and Cenomanian-Turonian formations constitute the main aquifers. Horizontal as well as vertical heterogeneity lead to a higher diversification of aquifer characteristics. To define the origins and understand the groundwater flows in this complex zone, we used a multi-tracer approach with the analysis of major elements and the isotopes of δ2H and δ18O. The chemical composition is mainly governed by the interaction with the rock with low electrical conductivity except in areas around domestic landfills. Geochemical results analyzing groundwater in the Piper diagram show two distinct chemical facies: the sulfated calcium and magnesium, and the hyper-chloride calcium. The levels of δ18O range from −7.60 to −4.25 while those of δ2H vary between −53.07 and −27.03. Analyses of signature isotopes differentiate two groups. The first contains high levels of heavy isotopes (highest levels of δ2H and δ18O) having therefore been submitted to evaporation. The second with lower levels of δ2H and δ18O did not undergo evaporation. The first one belongs to the unconfined free aquifer while the second corresponds to the captive aquifer.

Morphological Characterization of Mycobacteriophage R1

1974 ◽  
Vol 32 ◽  
pp. 254-255
Author(s):  
B. L. Soloff ◽  
T. A. Rado
Keyword(s):  
Carbon Source ◽  
Stationary Phase ◽  
Growth Phase ◽  
Minimal Medium ◽  
Morphological Characterization ◽  
Logarithmic Growth Phase ◽  
Complete Lysis ◽  
Lysogenic Culture ◽  
Logarithmic Growth

Mycobacteriophage R1 was originally isolated from a lysogenic culture of M. butyricum. The virus was propagated on a leucine-requiring derivative of M. smegmatis, 607 leu−, isolated by nitrosoguanidine mutagenesis of typestrain ATCC 607. Growth was accomplished in a minimal medium containing glycerol and glucose as carbon source and enriched by the addition of 80 μg/ ml L-leucine. Bacteria in early logarithmic growth phase were infected with virus at a multiplicity of 5, and incubated with aeration for 8 hours. The partially lysed suspension was diluted 1:10 in growth medium and incubated for a further 8 hours. This permitted stationary phase cells to re-enter logarithmic growth and resulted in complete lysis of the culture.

AEM analysis of crystallization in Ti-based amorphous alloys

1983 ◽  
Vol 41 ◽  
pp. 270-271
Author(s):  
A.R. Pelton ◽  
A.F. Marshall ◽  
Y.S. Lee
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Nucleation And Growth ◽  
Current Interest ◽  
Amorphous Films ◽  
Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

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