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Growth-controlled synthesis of polymer-coated colloidal-gold nanoparticles using electrospray-based chemical reduction

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Particuology 2021年第4期19卷 72-81页

作者： Mohamed Hasaan Hussain Noor Fitrah Abu Bakar Kim-Fatt Low Ana Najwa Mustapa Fatmawati Adam Mohd Nazli Naim I.Wuled Lenggoroe Faculty of Chemical Engineering Universiti Teknologi MARAShah AlamSelangor 40450Malaysia Faculty of Applied Sciences Universiti Teknologi MARAPerak BranchTapah CampusTapah RoadPerak 35400Malaysia Faculty of Chemical and Process Engineering Technology Universiti Malaysia PahangLebuh Raya Tun RazakGambangPahang 26300Malaysia Department of Process and Food Engineering Faculty of EngineeringUniversiti Putra MalaysiaSerdangSelangor 43400Malaysia Graduate School of Bio-Applications and Systems Engineering Tokyo University of Agriculture and TechnologyNaka Cho2-24-16KoganeiTokyo 184-8588Japan Department Chemical of Engineering Tokyo University of Agriculture and TechnologyNaka Cho2-24-16KoganeiTokyo 184-8588Japan

In this study,the controlled nucleation and growth of gold nanoparticles(GNPs)were investigated using a self-repelled mist in a liquid chemical reaction *** electrospray-based chemical reduction method was conducted in the aqueous region and at room temperature to synthesize the polymeric-stabilized gold *** electrospray technique was used to atomize a hydrogen tetrachloraurate(III)(HAuCl4)precursor solution into electrostatically charged *** atomized droplets were dispersed in an aqueous reaction bath containing L-ascorbic acid as a reducing agent and polyvinylpyrrolidone(PVP)as a *** effect of the electrospray parameters,specifically the flow rate and electrospray droplet size,as well as the reaction conditions such as the concentration of reactants,pH,and stabilizer(PVP),were *** mean diameter of the GNPs increased from around 4 to 9 nm with an increase in the electrospray flow rate,droplet size,and current passing through the electrospray *** and monodispersed GNPs were synthesized at a relatively high flow rate of 2 mL/h and a moderate concentration of 2 mM of precursor *** smallest-sized GNP with a high monodispersity was obtained in the reaction bath at a high pH of 10.5 and in the presence of *** is expected that continuous and mass production of the engineered GNPs and other noble metal nanoparticles could be established for scaling up nanoparticle production via the proposed electrospray-based chemical reduction method.

关键词： Electrospray Gold nanoparticles chemical reduction method L-ascorbic acid PVP Aqueous medium

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Development of self-cleaning and antibacterial properties on cotton fabric using silver nanoparticles and PFOTS

SPE Polymers

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SPE Polymers 2024年第4期5卷 568-575页

作者： Khan, Mahnoor Saeed, Muhammad Adnan Ullah, Sultan Repon, Md. Reazuddin Pranta, Arnob Dhar Yunusov, Nurzod Hossain, Md Monir Centre of Excellence in Solid State Physics University of the Punjab Lahore Pakistan Department of Mechanical Engineering Gazi University Ankara Turkey Department of Mechanical Engineering Faculty of Mechanical Engineering and Design Kaunas University of Technology Kaunas Lithuania Department of Textile Engineering Daffodil International University Dhaka Bangladesh Department of Bioproducts and Biosystems School of Chemical Engineering Aalto University Espoo Finland Department of Production Engineering Faculty of Mechanical Engineering and Design Kaunas University of Technology Kaunas Lithuania ZR Research Institute for Advanced Materials Sherpur Bangladesh Department of Textile Engineering Mawlana Bhashani Science and Technology University Tangail Bangladesh Department of Technological Education Fergana State University Fergana Uzbekistan Department of Wet Process Engineering Textile Engineering College Noakhali Bangladesh

The demand for superhydrophobic fabric with self-cleaning and antibacterial features as potential practical applications has been rising steadily with the passage of time. In this research work, the wet chemical method is used to manufacture cotton with a superhydrophobic coating. Thus, Nanoparticles of silver were produced by using an in situ method. Afterward, the fabric is treated with a solution of perfluorooctyltriethoxysilane to make it superhydrophobic. The cotton fabric performs remarkably with exceptional hydrophobicity as it had a contact angle of 157 ± 1° and less than 10° in sliding angle. Water droplet's dynamic behavior is also studied so that the superhydrophobic fabric development can be proven. The fabric shows excellent chemical durability by performing chemical tests. The antimicrobial and self-cleaning properties are greatly enhanced by the superhydrophobic coating on cotton. Particle density on the superhydrophobic cotton before and after self-cleaning was found 5.1 and 0.4 mg/cm². In addition, the treated cotton fabric also exhibited superior antibacterial properties against Escherichia coli bacteria. Therefore, the developed multifunctional cotton fabric can be used in real-life applications. Highlights: Cotton fabric enables to repelling of dirt, oil, and water-based stains more effectively. Silver nanoparticles possess potent antibacterial properties. Incorporation of PFOTS controls the release of silver into the environment. Versatile applications from healthcare and hospitality to outdoor and athletic apparel. © 2024 The Author(s). SPE Polymers published by Wiley Periodicals LLC on behalf of Society of Plastics Engineers.

关键词： in situ method medical applications multifunctional properties nanoparticles superhydrophobic

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CO2 adsorption performance of AC and Zn-MOF for the use of carbon capture and sequestration (CCS)

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Materials Today: Proceedings 2023年

作者： Daud, N.K. Faculty of Chemical & Process Engineering Technology Universiti Malaysia Pahang Lebuh Persiaran Tun Khalil Yaakob Kuantan26300 Malaysia

The purpose of this study is to examine and compare the performance of different kinds of solid adsorbents for CO2 adsorption. The performance of selected solid adsorbents such as activated carbon (AC) and Zn-MOF in CO2 adsorption was examined and compared based on variables: impact of adsorbent dose (200–400 mg) and the initial pressure (4–20 psig). Based on the characterisation results of the FTIR, EDX and XRD analyses, the outcomes suggest that Zn-MOF and AC have been successfully developed. The SEM images show agglomerations of Zn-MOF particles whilst a smooth surface has been observed on AC. According to the TGA analysis, AC manages to keep firm compared to Zn-MOF where it does not have the ability to maintain its frame when temperature reaches above 200 °C. From the CO2 adsorption results, the findings show that Zn-MOF performs better with a high CO2 adsorption capacity relative to AC in the low-pressure system. Under optimal conditions, the CO2 adsorption of 145.1 and 79.28 mg/g of Zn-MOF and AC were achieved, respectively indicated that Zn-MOF gives a good feature for a solid adsorbent to capture a higher percentage of CO2. © 2023

关键词： Carbon dioxide

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Surface Modification of Pcb-Recycled Plastic Using Fatty Acids and its Effect on the Mechanical Properties, Thermal Stability, and Water Absorption of Epoxy and Non-Metallic Printed Circuit Board Composite

SSRN

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SSRN 2024年

作者： Jaafar, Jafreena Adira Yuhana, Nor Yuliana Kamarudin, Nur Hidayatul Nazirah Department of Chemical Engineering and Process Faculty of Engineering & Built Environment Universiti Kebangsaan Malaysia Selangor Bangi43600 Malaysia Research Centre for Sustainable Process Technology Faculty of Engineering & Built Environment Universiti Kebangsaan Malaysia Selangor Bangi43600 Malaysia

The intricate mix of metallic and non-metallic components found within waste printed circuit boards often necessitates incineration to salvage valuable metals. However, the non-metallic constituents of these boards can be repurposed efficiently without adverse environmental *** this study, the non-metallic parts of the printed circuit board, which are composed of cross-linked resin and fiber, were used as fillers in the epoxy matrix. Fatty acids as phase-change materials have received considerable interest because of their diverse uses in building energy-efficient solar heating systems and air-conditioning systems. This study aimed to determine the properties of epoxy/non-metallic printed circuit board (NMPCB) composites modified with fatty acids as phase-change materials. The composites were prepared by hybridizing an epoxy matrix with NMPCB modified with fatty acids at 0.1, 0.5, and 1.0 M. The epoxy matrix and epoxy/NMPCB treated with stearic acid (epoxy/NMPCB-SA) and palmitic acid (epoxy/NMPCB-PA) composites were compared with each other based on their mechanical and thermal properties. Epoxy/NMPCB-1.0M SA successfully achieved an excellent balance between stiffness, strength, and toughness. Results showed that epoxy/NMPCB-SA has the highest thermal stability compared with unmodified PCB and epoxy/NMPCB-PA. © 2024, The Authors. All rights reserved.

关键词： Timing circuits

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A Novel Approach to Shale Stability Enhancement in Drilling Fluid Using Nano-Crystalline Hydroxyapatite Treated with Anionic Sodium Dodecyl Sulphate

A Novel Approach to Shale Stability Enhancement in Drilling ...

引用

2024 SPE Nigeria Annual International Conference and Exhibition, NAIC 2024

作者： Oseh, J.O. Norddin, M.N.A.M. Duru, U.I. Ridzuan, N. Oguamah, I.A. Okoli, N. Ngouangna, E.N. Ismail, I. Gbadamosi, A.O. Yahya, M.N. Gbonhinbor, J. Agi, A. Department of Petroleum Engineering Faculty of Chemical and Energy Engineering Universiti Teknologi Malaysia Johor Bahru Malaysia Malaysia Petroleum Resources Corporation Institute for Oil and Gas Universiti Teknologi Malaysia Johor Bahru Malaysia Nanostructured Materials Research Group - MD - Frontier Materials Universiti Teknologi Malaysia Johor Bahru Malaysia Department of Petroleum Engineering School of Engineering and Engineering Technology Federal University of Technology Imo State Owerri Nigeria Faculty of Chemical and Process Engineering Technology College of Engineering Technology Universiti Malaysia Pahang Al-Sultan Abdullah Pahang Gambang Malaysia Department of Petroleum Engineering King Fahd University of Petroleum and Minerals Dhahran Saudi Arabia Department of Chemical and Petroleum Engineering Bayero University Kano Gwarzo Road Kano Nigeria Department of Petroleum Engineering Niger Delta University Wilberforce Island Bayelsa State Amassoma Nigeria

ISBN: (纸本)9781959025474

Unstable wellbore often occurs in water-sensitive shale formations during drilling, leading to longer drilling times and higher costs. This problem has been addressed by using various shale stabilizers for water-based muds (WBMs) such as polymers, salts like potassium chloride (KCl), and nanoparticles (NPs) in practical applications. The strong clay attraction to water, inhibitor hydrophilicity, reservoir heterogeneity, and shale's unique pore size collectively hinder the complete stabilization of shale inhibitors. This work discusses the effects of WBM with sodium dodecyl sulphate-treated nanocrystalline hydroxyapatite (nHAp/SDS) on shale stabilization through various tests, including a linear swelling test, a hot-rolling dispersion test, and a capillary suction time (CST) test. The rheology and filtration properties of nHAp/SDS treatment fluids that had 0.5, 1.0, 1.5, and 2.0 wt.% were also examined. All the nHAp/SDS findings were compared with those of nanosilica and KCl-WBM. The plastic viscosity of the KCl-WBM was enhanced by 20-90% with increasing concentrations of nHAp/SDS and by 10-70% with nanosilica compared with the KCl-WBM at 10 cP. When compared with nanosilica, nHAp/SDS demonstrated a greater enhancement in the fluid loss control efficiency of KCl-WBM. The fluid loss was reduced to 6.4-3.1 mL from 7.9 mL, with nanosilica decreasing it to 7.3-4.6 mL. The rates of shale plug height swelling decreased in this order: 10.1% for KCl-WBM, 8.4-6.1% for nanosilica, and 7.5-4.1% for nHAp/SDS. This suggests that nHAp/SDS is a better inhibitor. The results from the CST test show that nanosilica and KCl absorbed more water and had higher CST values than nHAp/SDS. In addition, the hot-rolling test indicates that nHAp/SDS creates rough layers on the shale surface and reduces the shale-water interaction. nHAp/SDS had a higher recovery rate of 89.8% when it was used at 120 °C compared to nanosilica and KCl-WBM, which had recovery rates of 76.6% and 52.1%, respectively.

关键词： Potassium chloride

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Effect of Oil Polarity on Surfactant Foam Properties at Bulk and Macroscopic Scale

Effect of Oil Polarity on Surfactant Foam Properties at Bulk...

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2024 SPE Nigeria Annual International Conference and Exhibition, NAIC 2024

作者： Balakirisnan, A. Jaafar, M.Z. Sidek, M.A. Yakasai, F. Nwaichi, P.I. Ridzuan, N. Mahat, S.Q.A. Abbas, A.H. Ngouangna, E. Gbadamosi, A. Oseh, J.O. Gbonhinbor, J.R. Agi, A. Department of Petroleum Engineering School of Chemical and Energy Engineering Faculty of Engineering Universiti Teknologi Malaysia Johor Bahru Malaysia Institute for Oil and Gas Universiti Teknologi Malaysia Johor Bahru Malaysia Department of Chemical and Petroleum Engineering Faculty of Engineering Bayero University Kano PMB Nigeria Faculty of Chemical and Process Engineering Technology College of Engineering Technology Universiti Malaysia Pahang Al-Sultan Abdullah Pahang Gambang Malaysia School of Mining and Geosciences Nazarbayev University Astana Kazakhstan College of Petroleum and Geosciences King Fahd University of Petroleum and Minerals Dhahran Saudi Arabia Department of Petroleum Engineering Niger Delta University Wilberforce Island Amassoma Yenagoa Nigeria Centre for Research in Advanced Fluid and Processes Fluid Centre Universiti Malaysia Pahang Al-Sultan Abdullah Pahang Gambang Malaysia

ISBN: (纸本)9781959025474

Recent studies on oil-foam interaction using different types of oil were limited to the aspect of alkane chain length, density and viscosity of crude oil. However, oil polarity toward foam stability to predict the significant variable of the foam half-life and its evaluation in macroscopic oil displacement is still elusive in literature. In this study, the effect of oil polarity on foam properties at bulk and macroscopic scales was investigated. The effect of electrolytes on surfactant foam stability was studied. Subsequently, the foam stability in the presence of polar and non-polar oil was determined. Thereafter, the macroscopic oil displacement efficiency of surfactant foam was evaluated. Finally, a multivariate linear regression analysis was used to predict the significant variable of the foam half-life. The results indicate that cocamidopropyl betaine (CAPB) foam had better stability under the influence of oil polarity, with a half-life decrease of 8% in hexane oil compared to 86% by sodium dodecyl sulfate (SDS). Moreover, SDS foam flooding recovered 10% additional oil compared to 5% CAPB foam. However, oil recovery in the presence of pyridine decreased oil recovery of SDS and CAPB foam flooding to 6% and 3%, respectively. Likewise, mobility reduction factor (MRF) of SDS foam decreased by 74% compared to 39% by CAPB foam. However, both MRF of SDS and CAPB foam drop drastically by 81% and 90%, respectively in the presence of pyridine compared to hexadecane. Finally, the multivariate regression analysis indicates that surfactant is the most significant variable with a P value below 0.0001. The R2 proportion of variation in the response attributed to this model was 0.81, with a root mean square estimation of 5.2386. Copyright © 2024, Society of Petroleum Engineers.

关键词： Crude oil

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Photocatalytic degradation of methylene blue using ZnO supported on wood waste-derived activated carbon (ZnO/AC)

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Materials Today: Proceedings 2022年 57卷 1315-1321页

作者： Loke, J.Y. Mohd Zaki, R.S. Setiabudi, H.D. Department of Chemical Engineering College of Engineering Universiti Malaysia Pahang Lebuhraya Tun Razak Pahang Gambang26300 Malaysia Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Lebuhraya Tun Razak Pahang Gambang26300 Malaysia Centre of Excellence for Advanced Research in Fluid Flow Universiti Malaysia Pahang Lebuhraya Tun Razak Pahang Gambang26300 Malaysia

This study reports the preparation of ZnO supported on wood waste-derived activated carbon (ZnO/AC) and its activity towards photocatalytic degradation of methylene blue (MB). The removal of MB is imperative owing to its toxic impacts on the receiving water bodies. Thus, finding treatment techniques with criteria of efficient, cost-effective, and environmentally benign is highly needed. ZnO/AC has been synthesized by the incipient wetness impregnation method and was characterized using XRD, FTIR, PL, and UV–Vis-NIR. Characterization analysis revealed the successful impregnation of ZnO onto the AC. The best photocatalytic degradation of MB using ZnO/AC was achieved at 180 min, adsorbent dosage of 3 g/L, and pH 8. Complete MB degradation was attained at lower initial MB concentrations (10 – 50 mg/L) and slightly decreased at higher initial MB concentration (100 mg/L). The experimental data fitted well with the pseudo-first-order Langmuir-Hinshelwood kinetic model with a correlation coefficient (R2) greater than 0.995. The results revealed that the synthesized ZnO/AC exhibited remarkable photocatalytic activity towards the degradation of MB. © 2022

关键词： Zinc oxide

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Mechanical property study of plywood bonded with dimethylol dihydroxy ethylene urea crosslinked rice starch- natural rubber latex-based adhesive

Mechanical property study of plywood bonded with dimethylol ...

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作者： Soubam, Triveni Gupta, Arun Sharma, Swati Shima Jamari, Saidatul Faculty of Chemical & Process Engineering Technology Universiti Malaysia Pahang Pahang Gambang26300 Malaysia University Institute of Biotechnology Chandigarh University Punjab Mohali140413 India

There has been an increase in the demand for adhesives due to the increasing applications of plywood panels in the home furnishings and decorative items industries around the world. Most of the wood-based panels industry depends on synthetic adhesives due to its low cost and high performance. However, because synthetic adhesives emit the carcinogenic gas formaldehyde and increase the risk of human health, there is a growing interest in developing non-toxic and eco-friendly wood adhesives made from renewable materials. The present research aims to develop a bio-adhesive for plywood bonding based on two biopolymers: natural rubber latex (NRL) and dimethylol dihydroxy ethylene urea (DMDHEU) crosslinked rice starch. A bio-adhesive was ultimately formulated with varying weight ratio of NRL and DMDHEU crosslinked rice starch at 1:3, 1:1 and 3:1 respectively. Mechanical characteristics of plywood samples fabricated with the formulated bio-adhesive were measured using IS 17,304 and ISO 12466–1-2007 via hot press at 120 °C. The modulus of rupture (MOR) of plywood glued with Dm-B was 63 MPa, the modulus of elasticity (MOE) was 6480 MPa, and the internal bonding (IB) was 1.48 MPa, each of which met the ISO 12466–2-2007 and IS 303 standards. According to the findings, Dm-B had a profound impact on the performance of adhesion properties and contributed to the elimination of the use of hazardous synthetic adhesives. © 2022

关键词： Ethylene

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The Influence of Copper Post-Flotation Waste (Pfw) on the Early Heat of Hydration and Mechanical Properties of the Cement Mortars

SSRN

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SSRN 2023年

作者： Kalisz, Szymon Lieder, Marek Haustein, Elżbieta Faculty of Chemistry Department of Process Engineering and Chemical Technology Gdansk University of Technology Poland Faculty of Civil Engineering Department of Mechanics of Materials and Structures Gdansk University of Technology Poland

The aim of the research was an influence evaluation of the copper post-floatation wastes (PFW) on the selected parameters of cement mortar. The scope of the study concerned the determination of the composition and set properties of the waste itself. The research included determining the pozzolanic activity and mechanical strength of cement mortars and evaluating the trend of changes in the early heat hydration process. Mortars were designed based on Ordinary Portland Cement with different study material content from 2.5 to 10% of the cement mass. PFW particles have irregular grain morphology, and the content of oxides such as SiO2 and CaO mainly dominates their chemical composition. The waste amount of heavy metals, primarily zinc and copper. The concentration of these compounds impacts the hydration process of cement mortars (lower the heat of hydration, the incorporation of metal ions into the structure of the CSH, and the impact on the mechanical strength). The calorimetric studies showed that the heat generation rate decreased with the increasing cement replacement by PFW, reducing the total heat. After seven days of curing, the average compressive strength for the mortars containing 2.5% and 10% PFW was set at 39.3 and 42.5 MPa, respectively. The experiment confirmed the safety possibility of using the copper PFW as add (or substitute) in cement mortars and also found a potential direction for managing that waste. © 2023, The Authors. All rights reserved.

关键词： Compressive strength

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Study on bee bread extracts as active ingredients in SGC-Active film for food packaging application

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Materials Today: Proceedings 2023年

作者： Dewi Subramaniam, Sarmilaah Hajar Abd Rahim, Siti Abdul Halim, Luqman Basrawi, Firdaus Aini Mohd Azman, Nurul Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Pahang Gambang26300 Malaysia Meliponini Engineering Laboratory Faculty of Mechanical and Automotive Engineering Technology Universiti Malaysia Pahang Pahang Pekan26600 Malaysia

Globally, the adverse effect of synthetic preservatives on human health remains a challenge. Thus, the development of biodegradable active films is a potential step in realizing environmentally-friendly solutions. The objective of this study is to produce biodegradable active films made of semi-refined carrageenan and stingless bee bread extracts [5, 10, and 20 (v/v %)] as natural antioxidants. Moreover, the film stability was improved by adding glycerol and cellulose nanofibers as a plasticizer and reinforcing agents, respectively. The physical and mechanical properties of biodegradable active films were examined with the antioxidant release test. The antioxidant release tests were carried out in 95% of food simulants over 28 storage days with four-day intervals. The Fourier-Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) results confirm the good compatibility of the bee bread (BB) extracts with the polymer matrix of semi-refined carrageenan, glycerol, and cellulose nanofiber (SGC). In this study, the formulation of active packaging films incorporated with stingless bee bread extracts demonstrated competitive qualities, which implies that it could be a viable alternative to biodegradable films. © 2023

关键词： Antioxidants

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