Journal of Physical Science最新文献_第10页

Tailoring Particle Size and Agglomeration State of Mesoporous MCM-48 via Optimisation of Sol-gel Silica Process 溶胶-凝胶法优化介孔MCM-48的粒径和团聚状态

IF 0.7

Journal of Physical Science Pub Date : 2019-05-15 DOI: 10.21315/JPS2019.30.1.11

N. A. Mokri, Oh Pei Ching, H. Mukhtar, C. Leng

{"title":"Tailoring Particle Size and Agglomeration State of Mesoporous MCM-48 via Optimisation of Sol-gel Silica Process","authors":"N. A. Mokri, Oh Pei Ching, H. Mukhtar, C. Leng","doi":"10.21315/JPS2019.30.1.11","DOIUrl":"https://doi.org/10.21315/JPS2019.30.1.11","url":null,"abstract":"Mobil Composition of Matter no. 48 (MCM-48) is a promising inorganic particle due to its unique crystal structure and 3-dimensional porous network. Incorporating a discrete amount of nanosized MCM-48 for material development would give significant impact to the material’s performance and mechanical robustness. Thus far, the synthesis of MCM-48 in the nanoscale regime has been achieved via chemical modification techniques. However, they are often not reproducible due to limited understanding of surfactant behaviour. On the other hand, physical modification technique is more stable, thereby can reduce the possibility of producing other undesired mesophase. Nevertheless, this technique has not been adapted for nanosized MCM-48 synthesis. In this work, the physical modification technique was adapted to tailor MCM-48 particle size by varying stirring speed (i.e., 1000 rpm, 3000 rpm and 5000 rpm) and using different types of washing medium. Particle size distribution (PSD) studies showed mean particle size of 250 ± 50 nm. XRD analysis displayed several crystalline peaks indexed to cubic crystal mesophase. Transmission electron microscopy (TEM) and Brunauer-Emmett Teller (BET) analyses also showed a unique 3D cubic interconnecting porous network with specific surface area of 1030 m2 g–1. It was revealed that the degree of agglomeration increased as relative polarity of alcohol increased, CH3OH > CH3CH2OH. Therefore, particle size and agglomeration state of MCM-48 can be tailored by varying the physical modification techniques while maintaining its intrinsic pore morphology.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":"91 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84420337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Mechanical Strength and Corrosion Rate of Aluminium Composites (Al/SiO2): Nanoparticle Silica (NPS) as Reinforcement 纳米二氧化硅(NPS)增强铝/SiO2复合材料的机械强度和腐蚀速率

IF 0.7

Journal of Physical Science Pub Date : 2019-05-15 DOI: 10.21315/JPS2019.30.1.7

Munasir, Triwikantoro, M. Zainuri, R. Bäßler, Darminto

引用次数: 7

Shell Mound Investigation at Guar Kepah (Penang, Malaysia) Using 2-D Resistivity Imaging for Archaeological Study 利用二维电阻率成像技术对马来西亚槟城瓜尔吉巴贝壳丘进行考古研究

IF 0.7

Journal of Physical Science Pub Date : 2019-05-15 DOI: 10.21315/JPS2019.30.1.2

Nazrin Rahman, N. Ismail, M. Saidin

{"title":"Shell Mound Investigation at Guar Kepah (Penang, Malaysia) Using 2-D Resistivity Imaging for Archaeological Study","authors":"Nazrin Rahman, N. Ismail, M. Saidin","doi":"10.21315/JPS2019.30.1.2","DOIUrl":"https://doi.org/10.21315/JPS2019.30.1.2","url":null,"abstract":"Recent finding of “Penang Woman” skeleton in Guar Kepah, Penang, Malaysia has triggered researchers to discover more archaeological remains inside the area. Some part has been excavated, exposing some shell mound where the skeleton was found. It is believed that the shell mound remarks the burial place of people in early age civilisation. More excavation processes need to be conducted in the area to see if any more skeleton, monument and pottery could be found. 2-D resistivity method was carried out in the study area to determine resistivity value of shell mound and locate another possible shell mound. Pole-dipole array was used along four survey lines where one of the survey lines is conducted on the existing shell mound while the rest are on undisturbed ground in the study area. The data were processed by using Res2Dinv software. The results show that the resistivity value of the exposed shell mound is within the range of 100 Ωm to 200 Ωm. This value was used as the reference in predicting possible shell mound on the other survey lines. Some part of the other survey lines shows the same resistivity value as the existing mound. Therefore, it can be predicted as shell mound.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":"48 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87306003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Simulation Study of GaN/Al1-xGaxN Quantum Well (QW) Operating in the UV Region GaN/Al1-xGaxN量子阱(QW)在紫外区的模拟研究

IF 0.7

Journal of Physical Science Pub Date : 2019-05-15 DOI: 10.21315/JPS2019.30.1.3

M. J. Rashid, A. Mamun, Md. Samiul Islam Sadek, T. Hossain, S. Hasan

引用次数: 0

A Comparative Study of Structural and Ethanol Gas Sensing Properties of Pure, Nickel and Palladium Doped SnO2 Nanorods Synthesised by the Hydrothermal Method 水热法合成纯、镍和钯掺杂SnO2纳米棒结构和乙醇气敏性能的比较研究

IF 0.7

Journal of Physical Science Pub Date : 2019-04-25 DOI: 10.21315/JPS2019.30.1.10

Vicinisvarri Inderan, M. arafat, A. Haseeb, K. Sudesh, H. Lee

{"title":"A Comparative Study of Structural and Ethanol Gas Sensing Properties of Pure, Nickel and Palladium Doped SnO2 Nanorods Synthesised by the Hydrothermal Method","authors":"Vicinisvarri Inderan, M. arafat, A. Haseeb, K. Sudesh, H. Lee","doi":"10.21315/JPS2019.30.1.10","DOIUrl":"https://doi.org/10.21315/JPS2019.30.1.10","url":null,"abstract":"A comparative study of structural and ethanol gas sensing properties of pure, nickel and palladium doped SnO 2 nanorods synthesised by the hydrothermal method. J. Phys. Sci. , 30(1), 127–143, ABSTRACT: SnO 2 nanostructures are usually modified with some metal dopants in order to improve its gas sensing properties. In this work, pure tin oxide (SnO 2 ), nickel (Ni) doped SnO 2 (Ni:SnO 2 ) and palladium (Pd) doped SnO 2 (Pd:SnO 2 ) nanorods were successfully synthesised via hydrothermal method at low temperature (180°C) without templates or further calcination. All the samples were systematically analysed using X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM) and high resolution transmission electron microscopy (HRTEM). The sensor response (R = R 0 /R g ) towards 1000 ppm ethanol gas was investigated using nitrogen gas as a carrier gas. XRD results confirmed that all samples consisted of rutile tetragonal-shaped SnO 2 . It was found that the average diameter of nanorods formed in Ni:SnO 2 and Pd:SnO 2 were decreased to ~6 nm and ~10 nm, compared with nanorods formed in pure SnO 2 (~25 nm). The gas sensing results indicated that the sensor properties of SnO 2 were enhanced after the doping process. At 450°C, the Pd:SnO 2 nanorod sensor recorded the highest response value towards 1000 ppm ethanol gas which is 15 times higher than pure SnO 2 nanorods. Interestingly, all samples showed similar response time, ~ 40 s. However, pure SnO 2 and Ni:SnO 2 nanorods sensors exhibited longer recovery time compared to Pd:SnO 2 nanorods. Pd:SnO 2 nanorods recorded only 12 min of almost 100% recovery. It is proposed that Pd:SnO 2 sensor could be a promising candidate for the detection of ethanol gas.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":"81 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82202250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Thermoplastic/Natural Filler Composites: A Short Review 热塑性/天然填料复合材料:综述

IF 0.7

Journal of Physical Science Pub Date : 2019-02-15 DOI: 10.21315/JPS2019.30.S1.5

N. F. Zaaba, H. Ismail

引用次数: 39

Effect of Water Absorption on Dielectric Constant of TMD Cured of Carbonaceous Filled Epoxy Composites 吸水率对TMD固化碳基填充环氧复合材料介电常数的影响

IF 0.7

Journal of Physical Science Pub Date : 2019-02-15 DOI: 10.21315/JPS2019.30.S1.6

M. H. Abdul Kudus, H. Md. Akil, M. R. Zakaria, M. B. H. Othman

引用次数: 4

Surface Modification of Gentamicin-loaded Polylactic Acid (PLA) Microsphere Using Double Emulsion and Solvent Evaporation: Effect on Protein Adsorption and Drug Release Behaviour 双乳液和溶剂蒸发法修饰庆大霉素聚乳酸微球的表面:对蛋白质吸附和药物释放行为的影响

IF 0.7

Journal of Physical Science Pub Date : 2019-02-15 DOI: 10.21315/JPS2019.30.S1.7

N. Mamat, M. Jaafar, Z. Hamid

{"title":"Surface Modification of Gentamicin-loaded Polylactic Acid (PLA) Microsphere Using Double Emulsion and Solvent Evaporation: Effect on Protein Adsorption and Drug Release Behaviour","authors":"N. Mamat, M. Jaafar, Z. Hamid","doi":"10.21315/JPS2019.30.S1.7","DOIUrl":"https://doi.org/10.21315/JPS2019.30.S1.7","url":null,"abstract":"Polylactic acid (PLA) microsphere as a drug carrier has been extensively investigated for drug delivery systems. However, due to its limitation of surface hydrophobicity, surface modifications have been studied to improve its utilisation in tissue engineering applications. In the present study, PLA microsphere loaded with gentamicin (GENMS) was modified to enhance its hydrophilicity by surface treatment with additional of ethanol. Ethanol was applied as a co-treating medium in alkaline hydrolysis of NaOH to assist the hydroxide nucleophilic attack on the ester bond of PLA. Alkaline concentrations of NaOH and NaOH/ethanol was set at 0.15 M, 0.25 M and 0.35 M. After surface treatment, hydrophilicity of GENMS surface were improved significantly whereby contact angle reduced for about 23.1% and 26.8% for modification using NaOH and NaOH/ethanol, respectively, compared with the neat GENMS. Obvious surface roughness presented by NaOH/ethanol modification improved hydrophilicity of GENMS. As a result, protein adsorption on the GENMS surface treated by NaOH/ethanol were reduced than NaOH modification. Moreover, the highest encapsulation efficiency by NaOH/ethanol modification provided an advantage of co-treating by ethanol and has a greater drug release compared with NaOH modification.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":"125 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84954614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Effect of Carbon Nanotubes as Thermal Interface Materials on Thermal Conductivity Using Electrophoretic Deposition 碳纳米管作为热界面材料对电泳沉积导热性能的影响

IF 0.7

Journal of Physical Science Pub Date : 2019-02-15 DOI: 10.21315/JPS2019.30.S1.9

Raihana Bahru, A. Mohamed

{"title":"Effect of Carbon Nanotubes as Thermal Interface Materials on Thermal Conductivity Using Electrophoretic Deposition","authors":"Raihana Bahru, A. Mohamed","doi":"10.21315/JPS2019.30.S1.9","DOIUrl":"https://doi.org/10.21315/JPS2019.30.S1.9","url":null,"abstract":"Thermal interface materials (TIM) involve heat removal from electronic devices. It is used to remove heat sink from the heat sources to prolong the operation system of a device. It normally replaces the thermally insulated air between the two surfaces and uses it as a secondary thermal conductive material. The current thermal conductivity of TIM is considered to be a limitation for the development of advance electronic devices. In this study, the performance of carbon nanotubes (CNTs) which were used as TIM was investigated by using electrophoretic deposition method. The deposition of CNTs was varied from one to six layers and the performance of deposition was evaluated. The stable suspension of CNTs in DMF with zeta potential reading of –35.87 mV give rise to a smooth and uniform deposition on nickel plated copper substrate (heat spreader) with the usage of electrophoretic deposition (EPD). Maximum layers of CNTs deposition were obtained at six layers with 56.95 μm of deposition thickness and 11.0 mg of deposition weight. Thermal conductivity was measured using a thermal analyser while the thickness of deposition was observed using scanning electron microscope (SEM). The employment of CNTs improved the heat removal of TIM with thermal conductivity reading of 27.08 W m–1 K–1. Optimisation studies revealed that EPD operated at an applied voltage of 175 V coupled with 10 min deposition time produced a single layer deposition with the thickness of 14.14 μm.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":"31 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80966012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Flared Gas Emission Control from an Oil Production Platform 某采油平台燃烧气体排放控制

IF 0.7

Journal of Physical Science Pub Date : 2019-02-15 DOI: 10.21315/JPS2019.30.S1.8

Dina Liyana Mohamed Roshidin Murad, Mohd Shamsul Mohd Nasir, L. Law, I. Idris, M. Othman, M. Malaysia

{"title":"Flared Gas Emission Control from an Oil Production Platform","authors":"Dina Liyana Mohamed Roshidin Murad, Mohd Shamsul Mohd Nasir, L. Law, I. Idris, M. Othman, M. Malaysia","doi":"10.21315/JPS2019.30.S1.8","DOIUrl":"https://doi.org/10.21315/JPS2019.30.S1.8","url":null,"abstract":"Flared gas emission control from an oil production platform. Phys. Sci. , 30(Supp. 1), 125–147, ABSTRACT: In Samarang oil platform of Repsol (Talisman) Malaysia Limited, there is a need to increase its current oil production that would result in an increase of the associated/excess gas from 21 mmscfd to 31 mmscfd. The current low-pressure gas system on the platform is designed to accommodate up to 21 mmscfd of gas. The excess produced gas of 10 mmscfd, if not re-injected back into the reservoir, shall need to be flared on a daily basis in order to maximise the oil production rate. This gas flaring expends large amounts of energy and causes environmental degradation and potential health risk. There are four practical cases being considered in this unprecedented effort to control the flared gas and its resulting emissions from the industrially practical standpoint. Three cases use the existing compressor and varying compressor suction pressure between 5 barg and 6 barg with total compressors power is limited up to 2280 kW. The flared gas emission for these cases ranges from 7 mmscfd to 1 mmscfd, which is lower than the expected flowrate of 10 mmscfd. In the case where a new compressor is installed, a zero flared rate is achieved.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":"12 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73835348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5