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Surface Morphology and Thermo-Electrical Energy Analysis of Polyaniline (PANI) Incorporated Cotton Fabric

Energy Engineering 2024年第1期121卷 1-12页

作者： Md.Shohan Parvez Md.Mustafizur Rahman Mahendran Samykano Mohammad Yeakub Ali Automotive Engineering Research Group Faculty of Mechanical and Automotive Engineering TechnologyUniversiti Malaysia Pahang Al-Sultan AbdullahPekanMalaysia Department of Textile Engineering Khulna University of Engineering&Technology(KUET)KhulnaBangladesh Centre for Research in Advanced Fluid and Processes(CARIFF) Universiti Malaysia Pahang Al-Sultan AbdullahLebuhraya Tun RazakGambangMalaysia Mechanical Engineering Programme Area Faculty of EngineeringUniversiti Teknologi BruneiBruneiDarussalam

With the exponential development in wearable electronics,a significant paradigm shift is observed from rigid electronics to flexible wearable ***(PANI)is considered as a dominant material in this sector,as it is endowed with the optical properties of both metal and ***,its widespread application got delineated because of its irregular rigid form,level of conductivity,and precise choice of *** PANI in textile materials can generate promising functionality for wearable *** research work employed a straightforward in-situ chemical oxidative polymerization to synthesize PANI on Cotton fabric surfaces with varying dopant(HCl)***-treatment using NaOH is implemented to improve the conductivity of the fabric surface by increasing the monomer *** research explores the morphological and structural analysis employing SEM,FTIR and *** surface resistivity was measured using a digital multimeter,and thermal stability is measured using *** successful polymerization,a homogenous coating layer is *** is revealed that the simple pre-treatment technique significantly reduces the surface resistivity of Cotton fabric to 1.27 kΩ/cm with increasing acid concentration and thermal *** electro-thermal energy can also reach up to 38.2°C within 50 s with a deployed voltage of 15 *** modified fabric is anticipated to be used in thermal regulation,supercapacitor,sensor,UV shielding,antimicrobial and other prospective functional applications.

关键词： Polyaniline cotton in-situ polymerization SEM TGA heating fabric

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Baerveldt glaucoma implant with Supramid© ripcord stent in neovascular glaucoma: a case series

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International Journal of Ophthalmology(English edition) 2024年第2期17卷 265-271页

作者： Yuen Keat Gan Shiivaa Manjare Birapadian Muhammad Irfan Abdul Jalal Norshamsiah Md Din Department of Ophthalmology Faculty of MedicineUniversiti Kebangsaan MalaysiaKuala Lumpur 56000Malaysia UKM Molecular Biology Institute Universiti Kebangsaan MalaysiaKuala Lumpur 56000Malaysia Hospital Canselor Tuanku Muhriz Jalan Yaacob LatifBandar Tun RazakKuala Lumpur 56000Malaysia

AIM:To report the outcome of Baerveldt glaucoma implant(BGI)with Supramid©ripcord use in neovascular glaucoma(NVG).METHODS:We retrospectively evaluated the surgical outcome of the BGI with Supramid©3/0 ripcord stent in patients with *** tube ligation or venting slits were *** was removed after 3mo if the target intraocular pressure(IOP)was not *** success was defined as IOP≤21 mm Hg with(qualified success)or without IOP-lowering medications(complete success).RESULTS:Twenty-six eyes from 24 patients were included in the *** median duration of follow-up was 4[interquartile range(IQR)=1-5]y,ranging from 0.5 to *** decreased by a mean of 24.2 mm Hg(59.7%);from a mean of 40.5±12.6 mm Hg at baseline to 16.3±11.9 mm Hg,P≤*** number of glaucoma medications reduced from a median of 5(IQR=5-6)to 1(IQR=0-2,P≤0.001)at the final *** success rates were 88.0%at 1y,34.8%at 3y,66.7%at 4y,and 50%at *** phase(HP)in the first 3mo occurred in 15/26 eyes(57.7%)with a mean IOP of 31.1 mm ***:BGI with Supramid©ripcord stent gives close to 90%of the overall survival rate at the final follow-up without significant early ***,early HP is still a challenge.

关键词： neovascular glaucoma Supramid ripcord stent Baerveldt glaucoma implant

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Application of Intuitionistic Z-Numbers in Supplier Selection

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Intelligent Automation & Soft Computing 2023年第1期35卷 47-61页

作者： Nik Muhammad Farhan Hakim Nik Badrul Alam Ku Muhammad Naim Ku Khalif Nor Izzati Jaini Centre for Mathematical Sciences College of Computing and Applied SciencesUniversiti Malaysia PahangLebuhraya Tun RazakGambangKuantan26300PahangMalaysia Faculty of Computer and Mathematical Sciences Universiti Teknologi MARA PahangJengka CampusBandar Tun Abdul Razak Jengka26400PahangMalaysia

Intuitionistic fuzzy numbers incorporate the membership and non-membership *** contrast,Z-numbers consist of restriction components,with the existence of a reliability component describing the degree of certainty for the *** combination of intuitionistic fuzzy numbers and Z-numbers produce a new type of fuzzy numbers,namely intuitionistic Z-numbers(IZN).The strength of IZN is their capability of better handling the uncertainty compared to Zadeh's Z-numbers since both components of Z-numbers are charac-terized by the membership and non-membership functions,exhibiting the degree of the hesitancy of *** paper presents the application of such numbers in fuzzy multi-criteria decision-making problems.A decision-making model is proposed using the trapezoidal intuitionistic fuzzy power ordered weighted average as the aggregation function and the ranking function to rank the *** proposed model is then implemented in a supplier selection *** obtained ranking is compared to the existing models based on *** results show that the ranking order is slightly different from the existing *** analysis is performed to validate the obtained *** sensitivity analysis result shows that the best supplier is obtained using the proposed model with 80%to 100%consistency despite the drastic change of criteria *** Z-numbers play a very important role in describing the uncertainty in the decision makers’opinions in solving decision-making problems.

关键词： Intuitionistic Z-number fuzzy decision making ranking function supplier selection sensitivity analysis

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Characterization of La-promoted Ni/Al_2O_3 catalysts for hydrogen production from glycerol dry reforming

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Journal of Energy Chemistry 2014年第1期23卷 15-21页

作者： Kah Weng Siew Hua Chyn Lee Jolius Gimbun Chin Kui Cheng Centre of Excellence for Advanced Research in Fluid Flow Universiti Malaysia PahangLebuhraya Tun Razak26300 GambangKuantan PahangMalaysia Faculty of Chemical & Natural Resources Engineering Universiti Malaysia PahangLebuhraya Tun Razak26300 GambangKuantan PahangMalaysia

In the current paper, dry(CO2)-reforming of glycerol, a new reforming route, was carried out over alumina(Al2O3)-supported, non-promoted and lanthanum-promoted nickel(Ni) catalysts. Both sets of catalysts were synthesized via a wet co-impregnation procedure. Physicochemical characterization of the catalysts showed that the promoted catalyst possessed smaller metal crystallite size, hence higher metal dispersion compared to the virgin Ni/Al2O3catalyst. This was also corroborated by the surface images captured by the FESEM analysis. From temperature-programmed calcination analysis, the derivative weight profiles revealed two peaks, which represent a water elimination peak at a temperature range of 373 to 473 K followed by nickel nitrate decomposition from 473 to 573 K. In addition, BET surface area measurements gave 85.0 m2 g-1for the non-promoted Ni catalyst, whilst the promoted catalysts showed an average of 1% to 6% improvement depending on the La loadings. Significantly, reaction studies at 873 K showed that glycerol dry reforming successfully produced H2. The 2%La-Ni/Al2O3catalyst, which possessed the largest BET surface area, gave an optimum H2generation(9.70%) at a glycerol conversion of 24.5%.

关键词： Ni catalysts dry reforming lanthanide promotion reaction kinetics

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Catalytic performance of cement clinker supported nickel catalyst in glycerol dry reforming

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Journal of Energy Chemistry 2014年第5期23卷 645-656页

作者： Hua Chyn Lee Kah Weng Siew Maksudur R.Khan Sim Yee Chin Jolius Gimbun Chin Kui Cheng Faculty of Chemical & Natural Resources Engineering Universiti Malaysia Pahang Lebuhraya Tun Razak 26300 Gambang Kuantan Pahang Malaysia Centre of Excellence for Advanced Research in Fluid Flow Universiti Malaysia Pahang Lebuhraya Tun Razak 26300 Gambang Kuantan Pahang Malaysia

The paper reports the development of cement clinker-supported nickel （with metal loadings of 5 wt%, 10 wt%, 15 wt% and 20 wt%） catalysts for glycerol dry （CO2） reforming reaction. XRF results showed that CaO constituted 62.0% of cement clinker. The physicochemical characterization of the catalysts revealed 32-folds increment of BET surface area （SBET） with the addition of nickel metal into the cement clinker, which was also corroborated by FESEM images. Significantly, XRD results suggested different types of Ni oxides formation with Ni loading, whilst Ca3SiO5 and Ca2Al0.67Mn0.33FeO5 were the main crystallite species for pure cement clinker. Temperature-programmed reduction analysis yielded three domains of H2 reduction peaks, viz. centered at approximately 750 K referred to as type-Ⅰ peaks, another peaks at 820 K denoted as type-Ⅱ peaks and the highest reduction peaks, type-Ⅲ recorded at above 1000 K. 20 wt% Ni was found to be the best loading with the highest XG and H2 yield, whilst the lowest methanation activity. Syngas with lower H2/CO ratios （0.6 to 1.5） were readily produced from glycerol dry reforming at CO2-to-Glycerol feed ratio （CGR） of unity. Nonetheless, carbon deposit comprised of whisker type （Cv） and graphitic-like type （Cc） species were found to be in majority on 20 wt%Ni/CC catalysts.

关键词： cement clinker dry reforming glycerol nickel catalyst syngas

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A mixed acid methodology to produce thermally stable cellulose nanocrystal at high yield using phosphoric acid

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Journal of Bioresources and Bioproducts 2022年第2期7卷 17-26页

作者： Khairatun Najwa Mohd Amin Alireza Hosseinmardi Darren J.Martin Pratheep K.Annamalai Australian Institute for Bioengineering and Nanotechnology(AIBN) the University of QueenslandBrisbaneQLD 4072 Australia Faculty of Chemical and Process Engineering Technology College of Engineering TechnologyUniversiti Malaysia PahangLebuhraya Tun Razak26300 Gambang KuantanPahang D.M.Malaysia

Cellulose nanocrystal(CNC)with distinctive shape-morphology,enhanced thermal stability and dispersibility is essential for overcoming the challenges in processing polymer/CNC nanocom-posites through melt compounding at elevated *** study shows a mixed acid hy-drolysis method to produce CNC with improved thermal stability and high *** use of phosphoric acid(H_(3)PO_(4)),as a mild acid,in combination with a strong acid either sulphuric acid(H_(2)SO_(4))or hydrochloric acid(HCl)leads to reduced use of strong acids and low impact on our *** influences of acid combination and sequence of addition on the production yield were investigated by retaining the proportion of H_(3)PO_(4)to corrosive acid(H_(2)SO_(4)and HCl)4 to 1,and solid to liquid ratio 1꞉*** methodology has enabled to isolate CNC with higher thermal stability,dispersibility and productivity in terms of amount acid used 1 g of CNC,as compared with single acid *** CNC produced using the combination of H_(3)PO_(4)and HCl exhibits high thermal stability,dispersibility and rod-like shape morphology with length and width of(424±86)and(22±3)nm,***,this approach has reduced H_(3)PO_(4)consumption by 54%as compared with single acid hydrolysis method for the production of same amount of CNC.

关键词： Cellulose nanocrystal(CNC) Acid hydrolysis Thermal stability Mixed acid Crystallinity Production yield

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以对二甲苯氧化为对苯二甲酸为例简要综述一级C–H键活化(英文)

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催化学报 2014年第10期35卷 1641-1652页

作者： Nor Aqilah Mohd Fadzil Mohd Hasbi Ab.Rahim Gaanty Pragas Maniam Faculty of Industrial Sciences & Technology Universiti Malaysia PahangLebuhraya Tun Razak26300 Gambang KuantanPahangMalaysia

The oxidation of para‐xylene to terephthalic acid has been commercialised as the AMOCO process(Co/Mn/Br) that uses a homogeneous catalyst of cobalt and manganese together with a corrosive bromide compound as a promoter. This process is conducted in acidic medium at a high tempera‐ture(175–225 °C). Concerns over environmental and safety issues have driven studies to find mild‐er oxidation reactions of para‐xylene. This review discussed past and current progress in the oxida‐tion of para‐xylene process. The discussion concentrates on the approach of green chemistry in‐cluding(1) using heterogeneous catalysts with promising high selectivity and mild reaction condi‐tion,(2) application of carbon dioxide as a co‐oxidant, and(3) application of alternative promoters. The optimisation of para‐xylene oxidation was also outlined.

关键词：二甲苯氧化对苯二甲酸非均相催化剂活化氧化反应对二甲苯应用程序 AMOCO

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Insoluble additives for enhancing a blood-like liquid flow in micro-channels

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Journal of Hydrodynamics 2017年第1期29卷 144-153页

作者： Hayder A.Abdulbari Fiona Ling Wang Ming Wafaa K.Mahmood Center of Excellence for Advanced Research in Fluid Flow Universiti Malaysia PahangGambang 26300KuantanPahangMalaysia Faculty of Chemical Engineering and Natural Resources University Malaysia PahangLebuhraya Tun Razak 26300 KuantanPahangMalaysia

This study introduces an approach for flow enhancement in the bloodstream using insoluble additives as non-degradable drag reducing agents that can replace the polymeric soluble additives. An open micro-channel liquid flow system with three different channel sizes was assembled and used to test the drag reduction performances of the solutions investigated. Three different nano- powders （with five different addition concentrations） were investigated and used to form solutions of artificial blood with blood-like rheological properties. The experimental results showed that the optimum drag reduction performance was achieved using bismuth III oxides （65%） for a 200 ppm concentration solution flowing through a 100 μm channel, while titanium IV oxides and fumed silica achieved 57 and 55% drag reduction for a 200 ppm concentration solution flowing in a 50 ktm channel, respectively.

关键词： Microchannels pressure drop drag reduction nano-powder additives

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Efficiency enhancement of building multi-layer solar collector with SiO2–TiO2 hybrid nanofluids

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Building Simulation 2023年第10期16卷 1851-1862页

作者： N.N.M.Zawawi W.H.Azmi Z.A.A.Majid R.A.Rahim H.M.Ali lebuhraya tun razak Centre for Research in Advanced Fluid and Processes26300GambangKuantanPahangMalaysia Faculty of Mechanical and Automotive Engineering Technology Universiti Malaysia PahangPekanPahang26600Malaysia Kulliyyah of Allied Health Sciences International Islamic University of MalaysiaBandar Indera Mahkota25200KuantanPahangMalaysia ECE Department Kulliyyah of EngineeringInternational Islamic University MalaysiaJalan GombakKuala LumpurMalaysia Mechanical Engineering Department King Fahd University of Petroleum and MineralsDhahran31261Saudi Arabia Interdisciplinary Research Center for Renewable Energy and Power Systems(IRC-REPS) King Fahd University of Petroleum and MineralsDhahran31261Saudi Arabia

Due to the depletion of conventional energy sources and its limitless resources,solar energy is currently being considered as a viable alternative,especially for water heating *** thermal performance of multilayer solar collectors for water heating systems can be improved further by introducing hybrid nanofluids as advanced *** study demonstrates the utilisation of hybrid nanofluids in heating systems by employing a multilayer absorber solar *** SiO2–TiO2 hybrid nanofluids at volume concentrations up to 2.0%were tested at various flow rates(1.7 to 3.7 LPM)and solar radiation intensities(250 to 1000 W/m2).The thermal performance of the solar collector was assessed by measuring the temperature variation,heat loss,and overall efficiency of the *** the optimal volume concentration,the temperature difference for solar collectors employing SiO2–TiO2 hybrid nanofluids increased *** optimal volume concentration of 1.5%yields a maximum temperature difference of 9.5°*** addition,the efficiency and fluid temperature of the solar collector containing hybrid nanofluids have been enhanced by 22%and 37%,*** SiO2–TiO2 hybrid nanofluids with the optimal volume concentration of 1.5%were therefore recommended for maximum efficiency in the solar collector.

关键词： solar collector hybrid nanofluids solar water heating system solar simulator thermal efficiency

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Stem cell therapy in neurodegenerative diseases From principles to practice

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Neural Regeneration Research 2012年第23期7卷 1822-1831页

作者： Rajalingham Sakthiswary Azman Ali Raymond Department of Medicine Universiti Kebangsaan Malaysia Medical CentreBandar Tun Razak 56000Kuala LumpurMalaysia

The lack of curative therapies for neurodegenerative diseases has high economic impact and places huge burden on the *** contribution of stem cells to cure neurodegenerative diseases has been unraveled and explored extensively over the past few *** substitution of the lost neurons,stem cells act as immunomodulators and neuroprotectors.A large number of preclinical and a small number of clinical studies have shown beneficial outcomes in this *** this review,we have summarized the current concepts of stem cell therapy in neurodegenerative diseases and the recent advances in this field,particularly between 2010 and *** studies should be encouraged to resolve the clinical issues and vague translational findings for maximum optimization of the efficacy of stem cell therapy in neurodegenerative diseases.

关键词： stem cells neurodegenerative diseases Parkinson’s disease Huntington’s disease Alzheimer’s disease amyotrophic lateral sclerosis embryonic stem cells induced pluripotent stem cells mesenchymal stem cells neural stem cells

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