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Search Results: 1 - 10 of 463073 matches for " Luqman A. Adams "
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Economic route to sodium-containing silicate bioactive glass scaffold  [PDF]
Enobong R. Essien, Luqman A. Adams, Rafiu O. Shaibu, Idris A. Olasupo, Aderemi Oki
Open Journal of Regenerative Medicine (OJRM) , 2012, DOI: 10.4236/ojrm.2012.13006
Abstract: Tetraethyl orthosilicate (TEOS) and trimethyl orthosilicate (TMOS) alkoxysilanes are expensive common precursors for silicate based solgel derived bioactive glasses. Facile approa- ches involving low cost substitutes are a necessity for bioactive glass implants in bone regeneration therapy. Quaternary SiO2–Na2O–CaO– P2O5 bioactive glass was prepared by the solgel method from locally sourced sand as precursor. The monolith glass material obtained was subjected to immersion studies in simulated body fluid (SBF) for 21 days. The surface morphology and composition of the glass before and after immersion in SBF was studied using SEM-EDX, while pH analysis was used to monitor changes on the glass surface in SBF solution. FTIR was used to confirm apatite formation on the material. Results showed that the concentration of Ca, P and C increased on the surface of the glass sample as immersion time increased, which was attributed to the formation of carbonated hydroxyapatite (HCA). The material shows ability to bond to bone making it a promising scaffold material for bone repair.
Sol-Gel-Derived Porous Silica: Economic Synthesis and Characterization  [PDF]
Enobong R. Essien, Oluyemi A. Olaniyi, Luqman A. Adams, Rafiu O. Shaibu
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2012, DOI: 10.4236/jmmce.2012.1110098
Abstract: Porous silica was synthesized via the sol-gel process using clay obtained locally from Ijero-Ekiti in Ekiti State, Nigeria and compared with silica synthesized under similar conditions from sodium metasilicate (Na2SiO3) obtained comer- cially. The clay was initially refluxed with sodium hydroxide (NaOH) for 2 hours to extract SiO2 to form Na2SiO3, which was subsequently hydrolyzed to form a gel. The gel obtained was washed with deionized water to get rid of im-purities, dried and calcined at 800°C for 3 hours. The obtained silica powders were characterized using atomic absorp-tion spectrophotometer, Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). Results showed that the vibrational modes and diffraction patterns of the silica derived from com-mercial Na2SiO3 and that prepared from clay were similar containing pure amorphous SiO2. The morphology of the commercially obtained silica showed better arrangement of particles and exhibited slightly lesser porosity (62.4%) compared to that derived from clay which had a porosity of 65.5%. The result indicates that clay has a potential for use as an environmentally safe and economic starting material for preparing porous silica instead of high quality precursors.
Sol-Gel Synthesis of SiO2-CaO-Na2O-P2O5 Bioactive Glass Ceramic from Sodium Metasilicate  [PDF]
Luqman A. Adams, Enobong R. Essien, Rafiu O. Shaibu, Aderemi Oki
New Journal of Glass and Ceramics (NJGC) , 2013, DOI: 10.4236/njgc.2013.31003
Abstract: Bioactive glass ceramic with SiO2-Ca2O-Na2O-P2O5 composition was prepared by the sol-gel method using sodium metasilicate (Na2SiO3) as silica source. The monolith obtained was sintered at 1000?C for 2 hours after which X-ray diffraction (XRD) analysis showed presence of combeite (Na2Ca2Si3O9) as the crystalline phase. In vitro bioactivity test conducted on the material using simulated body fluid (SBF) showed the formation of carbonated hydroxyapatite on its surface. The material during the SBF test was observed to transform from a mechanically strong crystalline phase Na2Ca2Si3O9 to an amorphous phase after incubation for 14 days indicating that the material was biodegradable. Scanning electron microscopy (SEM) was used to investigate the surface morphology, while Fourier transform infrared (FTIR) spectroscopy facilitated the confirmation of hydroxyapatite (HA) formation. The monolith material obtained may be a good candidate for application in tissue engineering scaffolds.
Sol-gel bioceramic material from bentonite clay  [PDF]
Enobong R. Essien, Luqman A. Adams, Rafiu O. Shaibu, Aderemi Oki
Journal of Biomedical Science and Engineering (JBiSE) , 2013, DOI: 10.4236/jbise.2013.63032
Abstract:

Bioceramic material of the quaternary system; SiO2- CaO-Na2O-P2O5 that has composition similar to Bio- glass? 45S5 was prepared by the sol-gel method from locally obtained bentonite clay (BTC). The monolith obtained was sintered at 1000?C for 2 h to facilitate densification and phase transformation. X-ray diffraction (XRD) analysis revealed the presence of sodium calcium silicate, Na2Ca2Si3O9 as major crystal phase, and another secondary orthorhombic phase, NaCaPO4. Fourier transform infrared (FTIR) spectroscopic investigation confirmed the presence of Si-O-Si bonds and a crystalline phosphate in the glass network. Scanning electron microscopy (SEM) revealed a network of micropores and interconnected macropores. Overall, the material displays features amenable for possible utilization in tissue engineering scaffolds.

From AMIS to UNAMID: The African Union, the United Nations and the challenges of sustainable peace in Darfur, Sudan
Saka Luqman,Omede A. J
Canadian Social Science , 2012, DOI: 10.3968/2319
Abstract: Since, 2003 when hostilities broke out in Darfur region of Western Sudan, the African Union has been leading international community efforts at restoring peace to this trouble region. The organization deployed ceasefire monitoring commission, peacekeeping force and under Nigeria leadership broker peace agreement between the warring parties. From all indications the Darfur Peace Accord [DPA], brokered in Abuja, Nigeria has not resulted into the normalization of the security and political situation in Darfur as was envisaged. The apparent lack of robust capacity by the African Union Mission, AMIS to stabilize the security situation in Darfur reinforces the call for the United Nations to intervention. With a robust mandate, secure resource base and better logistic capabilities, the African Union-United Nations Hybrid Mission in Darfur, UNAMID has been proactive in enhancing the protection of its personnel, bases and equipments and greater capacity in the provision of security for safe delivery of humanitarian assistance and protection of civilians. Much as the deployment of UNAMID mission has brought semblance of security, there continue to exist challenges that are undermining security and militating against the achievement of durable peace in Darfur this paper argued. Key words: African Union; Conflict; Darfur; Peacekeeping; Security Résumé Depuis 2003, lorsque les hostilités ont éclaté dans la région du Darfour au Soudan occidental, l’Union africaine a dirigé les efforts de la communauté internationale à rétablir la paix dans cette région trouble. L’organisation a déployé commission de suivi cessez-le-maintien de la paix la force et sous la direction du Nigeria courtier accord de paix entre la guerre parties. de toutes les indications de l’Accord de paix sur le Darfour [DPA], négocié à Abuja, au Nigeria ne s’est pas traduite dans la normalisation de la situation sécuritaire et politique au Darfour comme cela a été envisagé. le manque apparent de forte capacité par la Mission de l’Union africaine, la MUAS à stabiliser la situation sécuritaire au Darfour renforce l’appel à l’Organisation des Nations Unies à l’intervention. Avec un mandat robuste, base de ressources en sécurité et de meilleures capacités logistiques, l’Union africaine- Nations Unies au Darfour, la MINUAD a été proactif dans le renforcement de la protection de son personnel, des bases et des équipements et une plus grande capacité dans la fourniture de sécurité pour une livraison s re de l’aide humanitaire et la protection des civils. Tout comme le déploiement de la mission de la MINUAD a a
Built: Building understanding in literacy and teaching. A CD ROM Resource for for Pre-service and In-service teachers.
Adams, A.
L1 Educational Studies in Language and Literature , 2002,
Abstract:
EFFECT OF TRIMETHYLOLPROPANE TRIACRYLATE (TMPTA) ON THE MECHANICAL PROPERTIES OF PALM FIBER EMPTY FRUIT BUNCH AND CELLULOSE FIBER BIOCOMPOSITE
M. KHALID,A. SALMIATON,C. T. RATNAM,C. A. LUQMAN
Journal of Engineering Science and Technology , 2008,
Abstract: The effect of trimethylolpropane triacrylate (TMPTA) as a coupling agent, on the mechanical and morphological properties of the PP-cellulose (derived from oil palm empty fruit bunch fiber) and PP-oil palm empty fruit bunch fiber (EFBF) biocomposites has been studied. The ratio of PP:cellulose and PP:EFBF is fixed to 70:30 (wt/wt%) while the concentration of the coupling agent is varied from 2.0 to 7.0 wt%. Results reveal that at 2.0 wt% of TMPTA concentration, tensile strength, flexural modulus, impact strength and Rockwell hardness of PP-cellulose biocomposite are significantly improved. The enhancement of mechanical properties in the presence of TMPTA is believed to be attributed to crosslinking of multifunctional monomer with the hydroxyl groups of cellulose resulting in better adhesion and superior PP-cellulose biocomposite properties. However, there are no significant changes observed in the PP-EFBF biocomposite properties upon the addition of TMPTA.
Strategy for Introducing Nanotechnology in Textile Industry of Pakistan
O. A. Golra,A. Luqman,N. M. Butt
International Journal of Chemical and Environmental Engineering , 2011,
Abstract: Textile Industry is one of the oldest industries in Pakistan and considered as the backbone of the country’s economy, even then, it is lagging behind in competition among the global textile players and losing its position because of traditional conservative culture of the industry. Thus, industrial and technological revolution is direly needed in the industry to stay competitive in the international market. Textile industry in the global world is adopting more promising technologies to achieve functional and high performance characteristics which include specialized coating, plasma based products, smart/technical technologies and nanotechnologies. Nanotechnology has a great potential to generate modern/ innovative products that could strengthen the economy and create new trade opportunities for the global textile industry, consequently, strengthening the economy of a country and resolving the major communal problems of the society. The aim of this paper is to discuss the current status of Pakistani Textile Industry and possible application of nanotechnology in textiles followed by a strategy for transferring conventional Industry of Pakistan into a nano-based textile Industry
Anti-inflammatory Activity of the Major Compound from Methanol Extract of Phaleria macrocarpa Leaves
I. Nor Fariza,J. Fadzureena,A. Zunoliza,A. Luqman Chuah
Journal of Applied Sciences , 2012,
Abstract: Phaleria macrocarpa or mahkota dewa is a plant originally found in Papua. The variety usages of this plant such as treatment for cancer, impotency, diabetes mellitus and skin diseases lead to the studies of verification and validation of the claims made by the Indonesian traditional medicine practitioners. This study was done by targeting the chemical marker compound, phalerin, to ensure whether this particular compound contribute to the anti-inflammatory activity of the plant. The phalerin was extracted from Phaleria macrocarpa leaves using methanol and the compound was verified by the HPLC, NMR and LCMS. The anti-inflammatory potential of phalerin was evaluated using three in vitro assays which are Lipoxygenase (LOX), Hyaluronidase (HYA) and Xanthine Oxidase (XO) assays. The phalerin was identified as mild anti-inflammatory compound with percentage inhibition of 34.83±4.64 and 23.47±9.43% in XO and LOX assay, respectively. However, phalerin does not showing significant activity on HYA assay with 1.34±0.57% of inhibition. This study verified that phalerin does have effects on inflammation and functions moderately on XO and LOX assays.
The Influence of Casting Machine Speed in Cellulose Acetate Membrane Preparation
Luqman Buchori
International Journal of Science and Engineering , 2010, DOI: 10.12777/ijse.v1i2.1231
Abstract: Membranes are being increasingly used as a valuable separation tool in laboratory as well as in industrial processes. Continual development of new membrane materials is crucial to sustain and expand the growing interest in this technology and modern polymer chemistry is highly proficient in tailoring polymers with desired properties such as increased mechanical, thermal and chemical stability. Cellulose acetate (CA) is one of the membrane polymers that has been used for aqueous based separation and used as both reverses osmosis (RO) and ultrafiltration (UF) membranes. This paper presents investigation of influence of casting machine speed in membrane preparation. CA is used in this study. That was CA-398-30 with average acetyl content 39.8 wt %. Non solvent used is water and the solvent is 99.7 % organic Dimethyl Sulfoxide (DMSO). The homogenous CA/DMSO solutions were prepared by dissolving CA in DMSO solvent. The CA concentration were varied 13 and 16 % while casting solution speed were varied from 20 to 80 mm/sec with distance cutting machine were fixed at 14 cm. In addition, non solvent in coagulation bath also were varied by 100 % water and 10 % DMSO in water. The results of this experiment describe effect of casting machine speed to water permeability. The effect of CA concentration to water permeability shows the adversative result between 13 and 16 % CA in 100 non solvent water. The similar result also observed in 10 % DMSO in water.
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