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Mohammed Abbas,Mohammed Alkaff,Asim Jilani,Haneen Alsehli,Laila Damiati,Mamdooh Kotb,Moahmmed Abdelwahed,Fahad Alghamdi,Gauthaman Kalamegam 한국조직공학과 재생의학회 2018 조직공학과 재생의학 Vol.15 No.5
BACKGROUND: Mesenchymal stem cells (MSCs) and/or biological scaffolds have been used to regenerate articular cartilage with variable success. In the present study we evaluated cartilage regeneration using a combination of bone marrow (BM)-MSCs, HyalofastTM and/or native cartilage tissue following full thickness surgical cartilage defect in rabbits. METHODS: Full-thickness surgical ablation of the medial-tibial cartilage was performed in New Zealand white (NZW) rabbits. Control rabbits (Group-I) received no treatment; Animals in other groups were treated as follows. Group-II: BMMSCs (1 9 106 cells) ? HyalofastTM; Group-III: BMMSCs (1 9 106 cells) ? cartilage pellet (CP); and Group-IV: BMMSCs (1 9 106 cells) ? HyalofastTM ? CP. Animals were sacrificed at 12 weeks and cartilage regeneration analyzed using histopathology, International Cartilage Repair Society (ICRS-II) score, magnetic resonance observation of cartilage repair tissue (MOCART) score and biomechanical studies. RESULTS: Gross images showed good tissue repair (Groups IV[III[Group II) and histology demonstrated intact superficial layer, normal chondrocyte arrangement, tidemark and cartilage matrix staining (Groups III and IV) compared to the untreated control (Group I) respectively. ICRS-II score was 52.5, 65.0, 66 and 75% (Groups I–IV) and the MOCART score was 50.0, 73.75 and 76.25 (Groups II–IV) respectively. Biomechanical properties of the regenerated cartilage tissue in Group IV closed resembled that of a normal cartilage. CONCLUSION: HyalofastTM together with BM-MSCs and CP led to efficient cartilage regeneration following full thickness surgical ablation of tibial articular cartilage in vivo in rabbits. Presence of hyaluronic acid in the scaffold and native microenvironment cues probably facilitated differentiation and integration of BM-MSCs.
Morphology controlled facile synthesis of MnO2 adsorbents for rapid strontium removal
Umar Asim,Syed M. Husnain,Naseem Abbas,Faisal Shahzad,Abdul Rehman Khan,Tahir Ali 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.98 No.-
MnO2 nanostructures with three distinct architectures, namelyflower, balk and tube-like, have beensynthesized through a single step microwave assisted hydrothermal method at different reactiontemperatures (110 C, 140 C and 180 C). The characterization of as prepared MnO2 samples wereperformed by means of Fourier transform infrared spectroscopy, X-ray diffraction, scanning electronmicroscopy, and transmission electron microscopy. The N2 adsorption–desorption isotherms revealedthe higher specific surface area and porosity of theflower like MnO2 as compared to balk and tube-likeMnO2. The adsorption behavior of as prepared adsorbents was investigated towards Sr2+ radionuclide. Because of the hierarchal structure and the high surface area (62.64 m2/g), MnO2-110 depicted the bestSr2+ adsorption performance with maximum adsorption capacity of 52 mg/g at pH 6 as compared to otherMnO2 morphologies synthesized at 140 C and 180 C. The kinetic studies revealed that the adsorption ofSr2+ onto MnO2-110 followed the pseudo-first-order model whereas the adsorption equilibrium dataobeyed the Freundlich and Sips model. Moreover, the MnO2-110 adsorbent reached the steady statequickly ( 10 min) and is capable to bind Sr2+ in slightly acidic to alkaline solutions.
Electrochemical sensing of H2O2 using cobalt oxide modified TiO2 nanotubes
Ullah Rahim,Rasheed Muhammad Asim,Abbas Shafqat,Rehman Khalil-ul,Shah Attaullah,Ullah Karim,Khan Yaqoob,Bibi Maryam,Ahmad Mashkoor,Ali Ghafar 한국물리학회 2022 Current Applied Physics Vol.38 No.-
Cobalt oxide (Co3O4) modified anatase titanium dioxide nanotubes (ATNTs) have been investigated for the electrochemical sensing of hydrogen peroxide (H2O2). ATNTs have been synthesized by a two-step anodization process. ATNTs were then modified with Co3O4 employing chemical bath deposition method. The structure and morphology of ATNTs and their modification with Co3O4 has been confirmed by X-ray diffraction by scanning electron microscopy. H2O2 sensing has been studied in 0.1 M PBS solution, by cyclic voltammetry and amperometry. Variation in the peak positions and current densities was observed with addition of H2O2 for Co3O4 modified ATNTs. Sensitivity and limit of detection improved with modification of ATNTs with Co3O4 with precursor concentration up to 0.8 M. However, at higher precursor concentrations sensitivity and limit of detection toward H2O2 deteriorated. Co3O4 Modified ATNTS using 0.8 M precursor concentration are comparatively more suitable for H2O2 sensing applications due to the optimum formation of Co3O4/ATNTs heterojunctions.
Ali Zahid,Mushtaq M. Asim,Abbas Yasir,Liu Wei,Wu Zhanpeng 한국탄소학회 2023 Carbon Letters Vol.33 No.3
The development of heteroatoms doped inorganic nanocrystal-carbon composites (INCCs) has attained a great focus for energy applications (energy production and energy storage). A precise approach to fabricate the INCCs with homogenous distribution of the heteroatoms with an appropriate distribution of metal atoms remains a challenge for material scientists. Herein, we proposed a facile two-step route to synthesize INCC with doping of metal (α-Fe2O3) and non-metals (N, P, O) using hydrogel formed by treating hexachlorocyclotriphosphazene (HCCP) and 3, 4, 5-trihydroxy benzoic acid (Gallic acid). Metal oxide was doped using an extrinsic doping approach by varying its content and non-metallic doping by an intrinsic doping approach. We have fabricated four different samples (INCC-0.5%, INCC-1.0%, INCC-1.5%, and INCC-2.0%), which exhibit the uniform distribution of the N, P, O, and α-Fe2O3 in the carbon architecture. These composite materials were applied as anode material in water oxidation catalysis (WOC); INCC-1.5% electro-catalyst confirmed by cyclic voltammetry (CV) with a noticeable catholic peak 0.85 V vs RHE and maximal current density 1.5 mA.cm−2. It also delivers better methanol tolerance and elongated stability than RuO2; this superior performance was attributed due to the homogenous distribution of the α-Fe2O3 causing in promotion of adsorption of O2 initially and a greater surface area of 1352.8 m2/g with hierarchical pore size distribution resulting higher rate of ion transportation and mass-flux.
Characterizing Barium Titanate Piezoelectric Material Using the Finite Element Method
Zubair Butt,Shafiq Ur Rahman,Riffat Asim Pasha,Shahid Mehmood,Saqlain Abbas,Hassan Elahi 한국전기전자재료학회 2017 Transactions on Electrical and Electronic Material Vol.18 No.3
The aim of the current research was to develop and present an effective methodology for simulating and analyzingthe electrical and structural properties of piezoelectric material. The finite element method has been used to makeprecise numerical models when dielectric, piezoelectric and mechanical properties are known. The static anddynamic responses of circular ring-shaped barium titanate piezoelectric material have been investigated using thecommercially available finite element software ABAQUS/CAE. To gain insight into the crystal morphology and toevaluate the purity of the material, a microscopic study was conducted using a scanning electron microscope andenergy dispersive x-ray analysis. It is found that the maximum electrical potential of 6.43 V is obtained at a resonancefrequency of 35 Hz by increasing the vibrating load. The results were then compared with the experimentally predicteddata and the results agreed with each other.
Characterizing Barium Titanate Piezoelectric Material Using the Finite Element Method
Butt, Zubair,Rahman, Shafiq Ur,Pasha, Riffat Asim,Mehmood, Shahid,Abbas, Saqlain,Elahi, Hassan The Korean Institute of Electrical and Electronic 2017 Transactions on Electrical and Electronic Material Vol.18 No.3
The aim of the current research was to develop and present an effective methodology for simulating and analyzing the electrical and structural properties of piezoelectric material. The finite element method has been used to make precise numerical models when dielectric, piezoelectric and mechanical properties are known. The static and dynamic responses of circular ring-shaped barium titanate piezoelectric material have been investigated using the commercially available finite element software ABAQUS/CAE. To gain insight into the crystal morphology and to evaluate the purity of the material, a microscopic study was conducted using a scanning electron microscope and energy dispersive x-ray analysis. It is found that the maximum electrical potential of 6.43 V is obtained at a resonance frequency of 35 Hz by increasing the vibrating load. The results were then compared with the experimentally predicted data and the results agreed with each other.
Recent developments for antimicrobial applications of graphene-based polymeric composites: A review
Nabira Fatima,Umair Yaqub Qazi,Asim Mansha,Ijaz Ahmad Bhatti,Rahat Javaid,Qamar Abbas,Nimra Nadeem,Zulfiqar Ahmad Rehan,Saima Noreen,Muhammad Zahid 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.100 No.-
Owing to its captivating properties, Graphene-based materials (GMBs) have appeared as a broad-spectrumantimicrobial material and attracting scientists and researchers’ attention. By focusing on the recentadvances in the polymeric nanocomposite’sfield, current study is positioned on the graphene-basedpolymeric composites having antibiofilm and antimicrobial activities to confront the current situations ofmicrobial resistance against antibiotics and other drugs. Furthermore, this review summarizesthe influenceof different factors on the antimicrobial activities of graphene-based polymeric composites like size, shape,number of layers, concentration, dispersibility, and functionalization, and also shed the light on the possiblemode of actions of these materials. Graphene-based polymeric composites exert its antimicrobial action byphysical damages (e.g., direct sharp edges’ contact to cell membranes of bacteria, wrapping of the bacterialcell, phospholipid extraction, and photo-thermal ablation) and chemical damages (e.g. oxidative-stress andcharge transfer). Besides, this review article thoroughly describes the antimicrobial applications ofgraphene-based polymeric composites, which are because of their good biocompatibility and superiorantimicrobial properties such as wound bandages and dressings, antimicrobial coatings, drug delivery, foodpackaging, hydrogel formation, and water disinfection. Present review may stimulate major concerns, spurfurther developments, and provide valuable insight into the promisingfields.