A Simple Method of Obtaining Spherical Nanosilica from Rice Husk

Noushad, Mohammed; Rahman, Ismail Ab; Husein, Adam; Mohamad, Dasmawati; Ismail, Abdul Rashid Hj

doi:10.18517/ijaseit.2.2.172

Cited by 19 publications

(32 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The other important effect of bleaching is that Δ H c is increased and as a result the relative crystallinity has a slight increase. As is reported, the RH is heavily used as a natural resource to produce silica and nanosilica particles, thus after the extraction of lignin through the bleaching process, the silica particles may become more active playing the role of nucleating agent leading to a higher degree of crystallization and give the blend hydrophobic properties in the case of LASR6 . The WHH data demonstrate that the crystallization will occur faster in LASR6 which contains BRH as filler.…”

Section: Resultsmentioning

confidence: 69%

Effect of lignin removal on mechanical, thermal, and morphological properties of polylactide/starch/rice husk blend used in food packaging

Mohammadi-Rovshandeh

Pouresmaeel-Selakjani

Davachi

et al. 2014

J of Applied Polymer Sci

View full text Add to dashboard Cite

The aim of this work was to investigate the possibility of using cost‐effective natural filler in a biodegradable polymer and find new set of materials for green biocomposites to be used in food packaging. In this regard, rice husk (RH) and bleached rice husk (BRH) have been used in the form of powder and the effect of lignin removal on mechanical and thermal properties of prepared composites with poly(l‐lactide) and starch were studied. Using FTIR technique, the lignin removal from RH has been approved. The tensile, charpy impact, and hardness tests were implemented to investigate the mechanical properties. It was concluded that filler caused increase both in the toughness and the Young modulus of samples. It was also found that the lack of lignin in BRH samples improves the mechanical properties. It was clearly observed that the BRH samples show larger modulus, charpy impact strength, and hardness compared to those filled with RH. Despite larger values for the elongations at break of RH samples, the mechanical properties showed a significant improvement (between 25 and 50% improvements) on lignin removal. The differential scanning calorimetry thermograms revealed an improvement in crystallization behavior and reduction of Tg from 47 to 31°C in the case of BRH‐filled samples. Finally, due to the removal of toxic lignin in the samples and modification of mechanical properties by this method, the BRH could have the ability of wide use in the bioplastics and food packaging industries. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41095.

show abstract

Section: Resultsmentioning

confidence: 69%

Effect of lignin removal on mechanical, thermal, and morphological properties of polylactide/starch/rice husk blend used in food packaging

Mohammadi-Rovshandeh

Pouresmaeel-Selakjani

Davachi

et al. 2014

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…This industry is very traditionally-equipped in conducting investment casting process, but the materials in fabricating the shell mould attract the ability for further studies. Moreover, the utilization of rice husk in the various area is encouraging [17].…”

Section: Introductionmentioning

confidence: 99%

“…Rice husk ash or RHA is a by-product of rice husk, waste material in agricultural and industrial and also highly consist of silica composition [18]. The high silica content in the rice husk ash has attracted interest in discovering ways to use it commercially [17]. Rice husk burning generates new waste, namely rice husk ash (RHA), which corresponds to 20% of husk volume [19].…”

Section: Introductionmentioning

confidence: 99%

“…This research intended to determine the strength exhibits by the combination of RHA and bentonite clays, in which, there were very least study to show the utilising of RHA as the only filler for mould making the material. Although, recent researchers have shown the development of rice husk for ceramic refractories and encouraging work have been done to extract the silica from the rice husk [17], [19]. It is found most of the studies, brought an approach to integrating rice husk and rice husk ash (RHA), as an additive to enhance shell mould properties; permeability and strength (MOR).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Shell Mould Strength of Rice Husk Ash (RHA) and Bentonite Clays in Investment Casting

Nanda

Ali

Idris

et al. 2018

International Journal on Advanced Science, Engineering and Information Technology

View full text Add to dashboard Cite

Investment casting process (IC) plays a major role in the modern manufacturing process in providing an economical means of mass production components with intricate shape and complex geometry as demand in various crucial applications including aerospace, automotive, military, biomedical and others. This casting technique, develop shell mould fabrication by coating the required pattern with a refractory mixture which offers the complex geometrical shape and sizes parts to be cast. However, the modern IC approach in shell mould production suffers from zircon's cost and supply instability as it is the main material to be used. Zircon uses as refractory filler for slurry production, and also in the form of sand used as stucco particles, is favoured by the investment casting facilities and industries as it exhibits the most versatile properties such as low thermal expansion and low reactivity to the metal to be cast. During the period of zircon supply shortage, many facilities introduce several alternatives. Currently, the step taken to reduce the cost of primary slurry material is by using some alternate refractory material like, alumina, silica, to be used with zircon for shell mould production. In relation to that, several researches continue to search for alternatives approach for shell mould materials. This research introduces the alternative method in fabricating investment casting shell mould as recognized from investment casting industry located in Sungai Puar of Bukittingi Padang Indonesia. This industry employs several local resources to fabricate the shell mould. These materials consist of rice husk ash (RHA), and two types of bentonite clays. The bentonite clays were obtained nearly from Kota Payakumbuh in the western provinces. However, this industry suffers from weak shell mould strength and need to be investigated and consulted. In this paper, the investigation on shell mould strength made from rice husk ash (RHA), and bentonite clays were conducted. The strength was measured by its modulus of rupture (MOR) performed in 3 points flexural bending test. The green and fired shell mould strength was determined from five type of slurry composition. The results revealed that the highest green and fired strength obtained were 0.157 MPa and 0.361 MPa from shell mould sample C of RHA (46%) and bentonite (54%) of its composition.

show abstract

“…Research has so far focused on the preparation of silica gels of various morphology e.g. nano particles, meso, macro and microporous particles (Noushad et al, 2012;Thuadaji and Nuntiya, 2008). Another potential silica source is the sugarcane bagasse ash.…”

Section: Introductionmentioning

confidence: 99%

Extraction of silica gel from Sorghum bicolour (L.) moench bagasse ash

Mupa¹,

Hungwe²,

Witzleben³

et al. 2015

Afr. J. Pure Appl. Chem.

View full text Add to dashboard Cite

Sweet sorghum (Sorghum bicolor (L.) moench), a crop that is grown by subsistence farmers in Zimbabwe was used to extract silica gel in order to assess its possible use as a raw material for the production of silica-based products. The gel was prepared from sodium silicate extracted from sweet sorghum bagasse ash by sodium hydroxide leaching. Results show that maximum yield can be obtained at pH 5 and with 3 M sodium concentration. The silica gel prepared at optimum pH 5 had a bulk density of 0.5626 g/cm 3 and anestimated porosity of 71.87%. Silica gel aged over 10 h had improved moisture adsorption properties. X-ray fluorescence (XRF) determinations show that the silica content in the ash is 40.1%. Characterization of sweet sorghum ash and silica gels produced at pH 5, 7 and 8.5 by Fourier Transform Infrared spectroscopy gave absorption bands similar to those reported by other researchers.Transmission electron micrographs show that silica prepared under optimum conditions is amorphous and consisted of irregular particles. Sweet sorghum proved to be a potential low cost raw material for the production of silica gel.

show abstract

A Simple Method of Obtaining Spherical Nanosilica from Rice Husk

Cited by 19 publications

References 0 publications

Effect of lignin removal on mechanical, thermal, and morphological properties of polylactide/starch/rice husk blend used in food packaging

Effect of lignin removal on mechanical, thermal, and morphological properties of polylactide/starch/rice husk blend used in food packaging

Shell Mould Strength of Rice Husk Ash (RHA) and Bentonite Clays in Investment Casting

Extraction of silica gel from Sorghum bicolour (L.) moench bagasse ash

Contact Info

Product

Resources

About