Enhanced crystallinity and thermal properties of cellulose from rice husk using acid hydrolysis treatment

2021 ◽  
Vol 260 ◽  
pp. 117789
Author(s):  
Halimatun Saadiah Hafid ◽  
Farah Nadia Omar ◽  
Jiangyu Zhu ◽  
Minato Wakisaka
Keyword(s):  
Thermal Properties ◽  
Acid Hydrolysis ◽  
Rice Husk ◽  
Enhanced Crystallinity

Physical Properties of Resistant Mungbean Starch Prepared by Enzyme and Acid Treatment

2012 ◽  
Vol 554-556 ◽  
pp. 1033-1037 ◽  
Author(s):  
Qing Jie Sun ◽  
Liu Xiong ◽  
Ben Xin Xing ◽  
Cui Xia Sun
Keyword(s):  
Thermal Properties ◽  
Physical Properties ◽  
Acid Hydrolysis ◽  
Resistant Starch ◽  
Acid Treatment ◽  
Crystal Form ◽  
Peak Temperature ◽  
Water Binding

The physical properties of enzyme and acid treated mungbean RS were studied. The crystal form was transformed into B type from C type with enzymatic and acid treatment.The solubility and transmittance decreased and mungbean RS content and the water-binding values increased with increase in enzyme and acid hydrolysis. The thermal properties observed by DSC showed a decrease in enthalpy of gelatinization (ΔH) and increases in onset (To), peak temperature (Tp) and conclusion temperature (Tc) upon enzyme and acid hydrolysis. The ratio of volume of resistant starch samples wasn’t much different. However, a significant reduction in starch pasting viscosity was observed with enzyme and acid treating

Acid hydrolysis of native corn starch: Morphology, crystallinity, rheological and thermal properties

2014 ◽  
Vol 103 ◽  
pp. 596-602 ◽  
Author(s):  
R.G. Utrilla-Coello ◽  
C. Hernández-Jaimes ◽  
H. Carrillo-Navas ◽  
F. González ◽  
E. Rodríguez ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Acid Hydrolysis ◽  
Corn Starch ◽  
Hydrolysis Of

Crystallinity, Tapping and Bulk Density of Microcrystalline Cellulose (MCC) Isolated from Rice Husk (RH)

2016 ◽  
Vol 835 ◽  
pp. 272-276 ◽  
Author(s):  
A. Zuliahani ◽  
R. Nurul Nadhirah ◽  
A.R. Rozyanty ◽  
Wan Izhan Nawawi ◽  
A.B. Nor Hanani
Keyword(s):  
Thermal Stability ◽  
Nitric Acid ◽  
Acid Hydrolysis ◽  
Bulk Density ◽  
Rice Husk ◽  
Microcrystalline Cellulose ◽  
Strong Acid ◽  
Composite Fabrication ◽  
Hydrolysis Process ◽  
The Stability

The isolation of microcryostalline cellulose (MCC) from rice husk (RH) via acid hydrolysis process has been successfully prepared by using different molarity of nitric acid (HNO3) and hydrochloric acids (HCl). The properties of MCC obtained such as tapping and bulk densities, thermal stability and percentage crystallinity were studied. Tapping and bulk densities shown comparable results regardless of different acid used that reflecting the potential of MCC as reinforcement filler in composite fabrication. The usage of 2M HNO3 gives highest percentage crystallinity (69%) in comparison with 2M HCl (49%). The result indicates the stability of MCC-RH obtained using HNO3 has great potential to replace strong acid in acid hydrolysis process.

Effects of Kenaf and Rice Husk on Thermal Properties of Kenaf/CaCO3/HDPE and Rice Husk/CaCO3/HDPE Hybrid Composites

2013 ◽  
Vol 748 ◽  
pp. 201-205
Author(s):  
Abd Aziz Noor Zuhaira ◽  
Rahmah Mohamed
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Rice Husk ◽  
Natural Fiber ◽  
Hybrid Composites ◽  
Degree Of Crystallinity ◽  
Differential Scanning Calorimetric ◽  
Kenaf Fiber ◽  
Twin Screw ◽  
Thermal Stability Of

In this research, rice husk and kenaf fiber were compounded with calcium carbonate (CaCO3)/high density polyethylene (HDPE) composite.Different loadings of up to 30 parts of 50 mesh sizes of rice husk particulate and kenaf fiber were compounded using twin-screw extruder with fixed 30 parts of CaCO3 fillerto produce hybrid composites of rice husk/CaCO3/HDPE and kenaf/CaCO3/HDPE.Compounded hybrid composites were prepared and tested for thermal properties. The thermal stability of the components was examined by thermogravimetricanalysis (TGA) and differential scanning calorimetric (DSC). The DSC results showed a slightly changes in melting temperature (Tm), crystallization temperature (Tc) and the degree of crystallinity (Xc) with addition of natural fiber. TGA indicates thermal stability of hybrid composite filled with kenaf or rice husk is better than unfilledCaCO3/HDPE composite.

The Study on Physical and Thermal Properties of Geopolymer Pastes

2017 ◽  
Vol 751 ◽  
pp. 538-543 ◽  
Author(s):  
Pongsak Jittabut
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Thermal Properties ◽  
Water Absorption ◽  
Sodium Hydroxide ◽  
Bulk Density ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Weight Ratio ◽  
Thermal Capacity

This research was aimed to a present the physical and thermal properties of geopolymer pastes made of fly ash (FA) and bagasse ash (BA) with rice husk ash (RHA) containing at the doses of 0%, 2%, 4%, 6%, 8% and 10% by weight. The sodium hydroxide concentration of 15 molars, sodium silicate per sodium hydroxide by weight ratio of 2.0, the alkaline liquid per binder at the ratio of 0.60 and curing at ambient temperature were used at the to mix all mixtures to gether for 7 and 28 days. The properties analysis of the geopolymer pastes such as compressive strength, bulk density, water absorption, thermal conductivity, thermal diffusivity and thermal capacity were tested. The results were indicated that geopolymer pastes that containing rice husk ash 2% by weight for 28 days of curing gave the maximum compressive strength of 84.42 kg/cm2, low water absorption of 1.16 %, low bulk density of 2,065.71 kg/cm3, lower thermal conductivity of 1.1173 W/m.K, lower thermal diffusion of 6.643 µm2/s and lower thermal capacity of 1.6819 MJ/m3K, respectively. The utilization of waste from agriculture industry via geopolymer pastes for green building materials can be achieved. For this research, physical properties and thermal insulation of geopolymer pastes were siqnificantly improved.

scholarly journals Assessment of heavy metals and thermal properties of soil‐rice‐husk system collected from three districts of Bangladesh

2018 ◽  
Vol 27 (2) ◽  
pp. 163-173
Author(s):  
Farzana Yasmin ◽  
Rajia Sultana ◽  
Md Zakir Sultan
Keyword(s):  
Heavy Metals ◽  
Thermal Properties ◽  
Rice Husk ◽  
Metal Content ◽  
Acid Digestion ◽  
Thermo Gravimetric ◽  
Thermo Gravimetric Analyzer ◽  
Rice Samples ◽  
Properties Of Soil

This study was conducted to evaluate the contamination of heavy metals and their thermogravimetric properties in the soil-rice-husk system. Heavy metals concentration was determined by Atomic Absorption Spectroscopy (AAS) and thermal property was also analyzed by using Thermo Gravimetric Analyzer (TGA). Metals uptake in rice crop grown in soils of three different areas (Savar, Chapainawabganj and Gazipur) in Bangladesh was studied. Soil, rice husk and rice samples were analyzed after microwave acid digestion. Heavy metals concentration detected in rice samples decreases in the following order as Fe > Mn > Zn > Cu > Ni > Co > Cd > Pb. The metal content in husk was higher than in corresponding rice. Fe concentration was higher than other metals in soil, husk and grain samples. The concentrations of Cd and Pb in the soil were found to be below the detection limit and the order of the other heavy metals as Fe > Mn > Zn > Cu > Ni. The thermal properties of the soil-ricehusk system did not show any significant visible variation during this experiment except for the soil of the Gazipur areas. The residual mass obtained from the TG thermogram helps to make a relation between the quality of soil and the rate of uptake of heavy metals by rice or its husk. Dhaka Univ. J. Biol. Sci. 27(2): 163-173, 2018 (July)

scholarly journals EFFECT OF ALUMINUM DROSS AND RICE HUSK ASH ON THERMAL AND MOULDING PROPERTIES OF SILICA SAND

2017 ◽  
Vol 36 (3) ◽  
pp. 794-800
Author(s):  
EF Ochulor ◽  
HOH Amuda ◽  
SO Adeosun ◽  
SA Balogun
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Thermal Properties ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Thermal Characteristics ◽  
Silica Sand ◽  
Cast Part ◽  
Solidification Kinetics ◽  
Moulding Sand

Moulding properties of foundry sand should be controlled so as to minimize casting defects. Its thermal characteristics are vital in defining the solidification kinetics of a cast part,  evolving microstructure and mechanical properties. Modification of the thermal properties of the moulding sand mix is important in achieving desired structure and mechanical properties in the cast component. This study investigates the incorporation of 2-12 wt. % aluminium dross (AlDr) and 1-6 wt. % rice husk ash (RHA) in silica sand on moulding and thermal properties of the resulting sand mix. Results show that RHA significantly reduced thermal conductivity of the moulding sand from 1.631-1.141 W/m. K (a 30% reduction).However, AlDr increased its thermal conductivity from 1.631-1.787 W/m.K for 1-6 wt. % AlDr, which later dropped progressively from 1.753-1.540 W/m.K for 8-12 wt. %. The moisture content increased abruptly from 4.0-4.2 % for 6-8 wt. % AlDr addition but decreased from 4.0-2.8% for0-6 wt. % RHA addition in the moulding sand mix. http://dx.doi.org/10.4314/njt.v36i3.19

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