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Synergistic Effect of Synthesized Zno Nanoflowers Coupled with Various Antibiotics Against Pathogenic Microbes: Characterization, Antibacterial and Antifungal Activity Assessment

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SSRN 2023年

作者： Nassima, Makaoui Moghni, Nassiba Boutemak, Khalida Imoudache, Hicham Akkache, Lynda Amel, Hadj-Ziane Zafour Chemical Engineering Laboratory Process Engineering Department Faculty of Technology University Saad Dahleb Blida 1 BP270 Blida09000 Algeria Research and Development Center SAIDAL GROUP. Algiers Algeria Functional Analysis of Chemical Processes Laboratory Process Engineering Department Faculty of Technology University Saad Dahleb Blida 1 BP270 Blida09000 Algeria Pharmaceutical Inorganic Chemistry Laboratory Faculty of Medcin University Saad Dahleb Blida 1 BP270 Blida09000 Algeria

Zinc oxide nanoparticles (denoted as ZnO NPs) were synthesized via a simple sol-gel technique using only two precursors. Various techniques were utilized to characterize the prepared ZnO nanoparticles. The X-ray diffraction analysis indicated the formation of nanoparticulated crystallite ZnO wheras the XPS spectra confirrmed the occurance of Zn and O atoms. SEM imaging showed nanoflower morphology with varying particle sizes at the nanoscale;whereas DLS characterization revealed a mean particle diameter that equals 19 nm. The EDX technique confirmed the presence of Zn and O with 85.43% and 12.4% respectively. Meantime the adopted colorimetric method revealed a 99.9% ZnO loading implying the high purity of the synthesized material. The synergetic effect of combining ZnO nanoflowers with antibiotics, namely chlortetracycline hydrochloride, spiramycin, and azithromycin on enhancing the antibacterial activity against various bacterial strains was investigated via disc diffusion technique. The antifungal activity of the synthesized ZnO-antibiotic was also examined. The antibacterial and antifungal activity of chlortetracycline hydrochloride, spiramycin enhanced in the presence of ZnO nanomaterial confirming the synergistic impact of the ZnO-chlortetracycline and ZnO-spiramycin conjunctions. The ZnO-CTC materials exhibed the best synergistic effect both against gram-negative and gram-positive organisms. The inhibitory zone of ZnO-CTC in Pseudomonas aeruginosa, Staphylococcus aureus, Bacillus subtilis, as well as Escherichia coli plates were 19.6, 14.0, 17.8, and 18.6 % higher than that of CTC alone. The inhibition zone of ZnO-CTC against Candida albicans, Saccharomyces cereviciae, and Aspergillus brasiliensis incresead by 42.4%, 21.0%, and 21.6% in comapraison to bare ZnO, respectively. This implies the combination of ZnO-CTC outperforms ZnO in terms of antibacterial efficiency. On the other hand, the antibacterial and antifungal efficiencies were decreased when coupling

关键词： Antibiotics

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Evaluation of Polyamidoamine-Assisted Scale Inhibitors for Silicate Scale Mitigation at Simulated Near-Wellbore Conditions

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SPE Journal 2025年第5期30卷 2673-2685页

作者： Tan, B. C Saaid, I. M Mahat, S. Q. A Zainal, S Bhaskoro, P. T Anuar, A Petroleum Engineering Department Universiti Teknologi PETRONAS Seri Iskandar Perak Malaysia (Corresponding author) Petroleum Engineering Department Universiti Teknologi PETRONAS Seri Iskandar Perak Malaysia Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Kuantan Pahang Malaysia PETRONAS Research Sdn. Bhd. Bangi Selangor Malaysia PETRONAS Carigali Sdn. Bhd. Kuala Lumpur Malaysia

Summary. Silicate scaling is a challenge that can result in formation damage and flow assurance issues in production systems due to alkali-based chemical flooding. Previous research has indicated that the classic scale inhibitor chemicals, such as phosphonates and phosphinopolyacrylates, exhibit poor efficiency in silicate scale inhibition. Polyamidoamine (PAMAM) dendrimers have gained considerable attention in the search for silicate scale mitigation along with other polymeric inhibitors to build synergism. The contribution of silicate scale inhibition has received little attention within the petroleum industry. In this paper, we aim to investigate the performance of PAMAM-assisted inhibitors for silicate scale mitigation under simulated near-wellbore region conditions. A static bottle experiment was carried out to assess the effectiveness of folic acid (PteGlu), PAMAM dendrimers of Generations 1.0 (PAMAM G-1) and 2.0 (PAMAM G-2), and their synergistic formulations (PAMAM G-1/PteGlu and PAMAM G-2/PteGlu) in silicate scale inhibition at increasing temperatures. A dynamic scale loop experiment was also performed to determine the minimum inhibitor concentrations (MIC) of pure scale inhibitor chemicals and their effectiveness in hindering silicate precipitation under fluid flow condition. To mimic a squeeze operation, a coreflooding experiment was conducted to evaluate the dynamic adsorption and desorption characteristics of the PAMAM-assisted scale inhibitors in sandstone formation. Static bottle test results revealed that the presence of inhibitors yields better scale inhibition as the temperature increases gradually. The findings show that PAMAM G-2/PteGlu silicate scale inhibitor outperforms the other inhibitors under static and dynamic conditions at all tested temperatures. This inhibitor reduced the turbidity of brine mixture by 84.1% at room condition, and the turbidity reduced further by 94.8% at a temperature of 90°C. When tested with the silicomolybdate metho

关键词： remediation of hydrates asphaltene inhibition asphaltene remediation geology geologist production chemistry mineral wax inhibition scale remediation inhibitor

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Portable and Autonomous Pedot Modified Flexible Paper-Based Methanol Fuel Cell Sensing Platform Applied to L1cam Recombinant Protein Detection

SSRN

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SSRN 2023年

作者： Carneiro, Liliana P.T. Pinto, Alexandra M.F.R. Ivanou, Dzmitry Mendes, Adélio M. Sales, M. Goreti Ferreira BioMark sensor research@UC/CEB-LABBELS Department of Chemical Engineering Faculty of Sciences and Technology University of Coimbra Portugal BioMark sensor research@ISEP/CEB-LABBELS School of Engineering Polytechnic Institute of Porto Portugal CEFT Transport Phenomena Research Center Department of Chemical Engineering Faculty of Engineering University of Porto Portugal LEPABE - Laboratory for Process Engineering Environment Biotechnology and Energy Faculty of Engineering University of Porto Portugal ALiCE - Associate Laboratory in Chemical Engineering Faculty of Engineering University of Porto Rua Dr. Roberto Frias Porto4200-465 Portugal

This work describes for the first time a 5-stack direct methanol fuel cell (DMFC) based on poly(3,4-ethylenedioxythiophene) modified paper (PEDOT/PB-DMFC), which acts as an energy source and biosensor, coupled to an electrochromic cell (EC) using PEDOT-PSS/gold nanoparticles. It is autonomous and monitors the biosensor response by colour change, as appropriate for point-of-care (POC) applications. The PEDOT/PB-DMFCs and the EC are both built on a simple paper substrate in a single layer and flexible arrangement. It was designed to target L1CAM protein, as a proof-of-concept of this *** detail, DMFC strips were developed from square Whatman paper that served as a support for all fuel cell components. The EC was made on baking paper treated with polydimethylsiloxane (PDMS). The PEDOT/PB-DMFCs operate in passive mode with a few microliters of a methanol solution. The biosensor layer was obtained on the anode ink (a composite of EDOT, oxidized multi-walled carbon nanotubes, and carbon black with Pt and ruthenium) by electropolymerizing 3,4-ethylenedioxythiophene (EDOT) in situ in the presence of L1CAM. Each PEDOT/PB-DMFC single cell generates 0.3-0.35 V per cell, and a five-cell stack delivers 1.5-1.6 V when fed with 0.5 M methanol concentration. The fabricated PEDOT/PB-DMFC/biosensor was calibrated at room temperature against L1CAM using buffer and Cormay® serum and showed linear responses from 1.0 × 10−12 to 1.0 × 10−8 M with a detection limit of 1.17 × 10-13 M;good reproducibility and selectivity was demonstrated. When the EC was connected to the hybrid PEDOT/PB-DMFC device, a colour gradient was ***, this work opens new horizons to the use of biosensors even in places with energy scarcity and offers an alternative to reduce the current energy demand. © 2023, The Authors. All rights reserved.

关键词： Direct methanol fuel cells (DMFC)

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Preparation and characterization of poly(lactic acid)/linear low density polyethylene/recycled tire waste/graphene nanocomposites

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Materials Today: Proceedings 2023年

作者： Bijarimi, Mohd Abdulsalam, Yaser Norazmi, M. Normaya, Erna Alhadadi, Waleed Desa, M.S.Z. Faculty of Chemical and Process Engineering Technology Lebuh Persiaran Tun Khalil Yaakob 26300 Kuantan Pahang Malaysia Experimental and Theoretical Research Laboratory Department of Chemistry Kulliyyah of Science International Islamic University Malaysia 25200 Kuantan Pahang Malaysia

Biobased polymer nanocomposites are a separate class of materials created by the inclusion of nanoparticles into polymer matrix composites. In comparison to ordinary composites, these materials have superior mechanical, electrical, thermal, and barrier characteristics, as well as exceptional microstructures, which have attracted global interest. For toughness modification, poly(lactic acid) (PLA) is commonly toughened with low-modulus polymers such as linear low-density polyethylene (LLDPE). Due to environmental concerns, recycled tire waste (RW) was included in a binary blend of PLA and LLDPE and reinforced with graphene nanoplatelets (GNP). The polymer resins, RW and GNP were melt blended in a twin-screw extruder at 60 rpm for 15 min. The blends were then characterized for chemical changes, thermal transitions and thermal degradation. Due to the presence of platelets, it was discovered that the 40/50/10/5 (PLA/LLDPE/RW/GNP) nanocomposite exhibited the maximum thermal degradation temperature. Thermal transitions were observed in all nanocomposites without any appreciable chemical changes. © 2023 Elsevier Ltd. All rights reserved.

关键词： Blending

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Reprocessing of 3D printing filament’s fragment by hydrolysis and recycling into the formation of bioplastic

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Materials Today: Proceedings 2022年 51卷 1277-1281页

作者： Nurin Zarifah Mohd Zairullisham Umairah Hannan Ab Hakim Hatika Kaco Amilin Shahida Saadon Mohd Shaiful Sajab Kolej GENIUS Insan Universiti Sains Islam Malaysia 71800 Nilai Negeri Sembilan Malaysia Research Center for Sustainable Process Technology (CESPRO) Department of Chemical and Process Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia 43600 Bangi Malaysia

Currently, additive manufacturing become an expanding industry which committing high demand of plastic. Consequently, plastic waste generated will be increased exponentially. Polylactic acid (PLA) and polyethylene terephthalate (PET) are extensively used polymer as the filament for 3D printing. Therefore, the reprocessing of the fragments is necessary to reduce the plastic pollution. This study the aims to investigate the conversion of PET to terephthalic acid (TPA) and its conversion breakthrough via caustic soda hydrolysis. Meanwhile, the effect of PLA dissolution and its integration with glycerol to produced bioplastic was investigated. Fragment of PET was undergone hydrolysis process at different time and the conversion rate showed increment as prolong reaction time. TPA yield produced follow the same trend of PET conversion. FTIR analysis proved the formation of TPA after the hydrolysis process due to the formation of O–H and C–H which corresponding to the formation of carboxylic acid and ethylene glycol of TPA. Concurrently, PLA was dissolved in chloroform at different time and mixed with glycerol which acts as plasticizer to form PLA/glycerol plastic. It was found that the longer dissolution time, the higher the percentage of PLA dissolved. From FTIR analysis, the functional group of PLA has changed indicated that the reaction between dissolved PLA and glycerol has been taken placed. The results indicate that PET degradation can occur at low cost and on this basis. Ergo, this formation of valuable products from waste polymers can be an alternative method in promoting reduced waste generation.

关键词： 3D printing filament Biodegradable plastic Low-cost processing Polymer recycling Value added

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Visible-light-sensitive coatings of graphitic carbon nitride with inherent porosity induced by camphor

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Journal of Photochemistry and Photobiology A: Chemistry 2025年 468卷

作者： Schimon, Dominik Patakyová, Sylvia Stavárek, Petr Dzik, Petr Homola, Tomáš Zažímal, František Klusoň, Petr Institute of Chemical Process Fundamentals of CAS v. v. i. Rozvojová 135 Prague 6 165 00 Czech Republic Faculty of Chemistry Brno University of Technology Purkyňova 118 Brno612 00 Czech Republic Department of Plasma Physics and Technology Faculty of Science Masaryk University Kotlářská 267/2 Brno611 37 Czech Republic Faculty of Chemical Engineering University of Chemistry and Technology Prague Technická 5 166 28 Praha 6 Czech Republic Institute of Environmental Studies Faculty of Science Charles University in Prague Benatska 2 Prague120 00 Czech Republic

Graphitic carbon nitride is referred to as a light-sensitive material with a prominent position in photocatalysis. It was shown repeatedly that the interpretation of kinetic data in the photocatalytic ox/redox reactions is not an easy task. The well-developed microporous structure, unlike that of standard heterogeneous catalysis, is not always the necessary feature. A very fine porous structure brings a significant part of the active surface. However, it is not usually available for photons. When hit the surface, they form reactive species that then diffuse deeper into the catalytic particle. However, the process becomes more driven by mass transport and the reaction rate measurement no longer takes place in the kinetic regime. This limitation can be avoided by using light-sensitive materials that offer a sufficiently developed surface, but only to the extent that it is directly accessible to the incident photons. Here, such a type of thin-film catalyst is described, and porogenic camphor is used to create a suitable surface morphology and porosity. The roles of camphor content and additional plasma treatment were experimentally verified. All coatings were described with a battery of techniques with a focus on their structural and morphological properties. The coatings were then employed in a tetracycline oxidation in a slit-type micro-photoreactor. Their performance was compared with chemically identical structures, however, obtained without the porogenic body, and/or the additional plasma treatment. The chosen transformation of tetracycline represents both a suitable model reaction and a process of general relevance in the decontamination of wastewater containing pharmaceuticals. © 2025 The Authors

关键词： Plasma deposition

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Model-Based Pharmaceutical Crystallization Design: Is it Ready for Take-Off?

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SSRN 2023年

作者： Orosz, Álmos Bosits, Miklós Hunor Pusztai, Éva Pataki, Hajnalka Szalay, Zsófia Demeter, Ádám Szilágyi, Botond Faculty of Chemical Technology and Biotechnology Budapest University of Technology and Economics Műegyetem rkp. 3. BudapestH-1111 Hungary Department of Organic Chemistry and Technology Faculty of Chemical Technology and Biotechnology Budapest University of Technology and Economics Műegyetem rkp. BudapestH-1111 Hungary Gedeon Richter Plc P.O. Box 27 BudapestH-1475 Hungary Department of Environmental and Chemical Process Engineering Faculty of Chemical Technology and Biotechnology Budapest University of Technology and Economics Műegyetem rkp. BudapestH-1111 Hungary

process modeling is gaining attention in the pharmaceutical industry due to the promise of exploring the design space with less experimentation. The model-based design has four major stages: laboratory investigation, macroscopic modeling, kinetic model discrimination, and model-aided problem-solving. The associated numerical apparatus can be prohibitive for many, undermining the attainable benefits. This study aims to demonstrate the readiness of modeling by guiding the reader through the essential steps, implemented and executed in a user-friendly but restrictive simulator and a highly technical, custom-coded environment. The crystallization of (S)-pregabalin l-tartrate from a racemic aqueous solution is applied as a surrogate system, involving secondary nucleation, growth, and agglomeration. The distomer may act as an impurity. This process is sufficiently complex to be representative but straightforward enough to be familiar to a broad audience. Despite their differences, both modeling environments resulted in the same kinetic model structure and fitted the measurements well. The models are compared based on the in-silico DoE outcomes rather than the goodness of fit. The analysis revealed that the key conclusions are identical, which validates the utilization of the user-friendly simulator in time-constrained applications. © 2023, The Authors. All rights reserved.

关键词： Kinetic theory

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Extraction and Characterization of the Recovery Phenolic Compounds from Commiphora Gileadensis Bark Using Microwave-Assisted Extraction

SSRN

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SSRN 2023年

作者： Mokaizh, Aiman Awadh Bin Nour, Abdurahman Hamid Ukaegbu, Chinonso Ishmael Hawege, Emsalem Faraj Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Al-Sultan Abdullah Pahang Gambang26300 Malaysia Department of Biological Sciences Kings University Odeomu Odeomu Osun state PMB 555 Nigeria Faculty of Engineering Elmergib University Al Khums Libya

Developing nations of the world believe in full assurance of protection, usefulness, and quality of herbal products and medical plants. Commiphora gileadensis is a medicinal plant having a variety of biological activity. There are numerous therapeutic benefits for the bark of the C. gileadensis, including the treatment of wounds, inflammatory diseases, and bacterial infections. This study used microwave-assisted extraction (MAE) to examine the recovery yields and phenolic components on the ethanolic extracts of C. gileadensis bark. Different "MAE process parameters (microwave power, irradiation time, sample/solvent ratio, temperature, and solvent (ethanol) concentration) were studied for their impacts on the extraction process using One-Factor-At-a-Time (OFAT) method. The extracts were further characterized for the presence of different phytochemicals using analytical techniques such as Gas Chromatography-Mass Spectroscopy (GC-MS) and Fourier Transform Infrared Spectroscopy (FTIR) analyses." The experimental findings revealed that the maximum extraction yield, total phenolic content (TPC), and total flavonoid content (TFC) of the ethanolic extract of the of C. gileadensis bark using MAE process were "39.40±0.47 w/w%, 166.41±3.97 mg GAE/g d.w., and 52.83±2.95 mg QE/g d.w.", respectively, at 4 minutes irradiation time, 1:12 g/mL ratio of sample/solvent, 400 W microwave power, 50 °C extraction temperature, and 60% v/v ethanol concentration. Furthermore, 30 phenolic constituents were discovered in the extract of C. gileadensis bark for the first time which shows good antioxidant activity. This claimed that MAE is a suitable technique for efficiently extracting different groups of phytochemicals from the bark of C. gileadensis. © 2023, The Authors. All rights reserved.

关键词： Bioactivity

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Sustainable lipid production from Chlorella vulgaris USU1 strain using packed absorption column-derived effluent as carbon source for biomass generation

Results in Engineering

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Results in engineering 2025年 26卷

作者： Trisakti, Bambang Sidabutar, Rivaldi Irvan, Irvan Munir, Erman Sarah, Maya Hanum, Farida Syahputra, Mhd. Rivaldi Michael, Michael Vanness, Vanness Sinamo, Gloria Clarita Ambarita, Renata Sidauruk, Mawardyah Silaban, Selvia Geraldine Nabilah, Yasmin Daimon, Hiroyuki Takriff, Mohd. Sobri Abdul, Peer Mohamed Department of Chemical Engineering Faculty of Engineering Universitas Sumatera Utara Medan20155 Indonesia Waste-to-Industrial Sustainable Energy Center Universitas Sumatera Utara Medan20155 Indonesia Department of Biology Faculty of Mathematics and Natural Sciences Universitas Sumatera Utara Medan20155 Indonesia Department of Chemical Engineering for Energy and Environment KTH Royal Institute of Technology SE-100 44 Stockholm Sweden Department of Applied Chemistry and Life Science Toyohashi University of Technology Toyohashi441-8580 Japan Mechanical and Nuclear Engineering Department College of Engineering University of Sharjah Sharjah Emirate61467 United Arab Emirates Department of Chemical and Process Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Selangor Darul Ehsan Bangi43600 Malaysia

The global surge in population and economic growth has intensified energy consumption reliant on fossil resources, leading to environmental degradation. Biogas, while offering a renewable alternative, requires CO2 purification. This study addresses the critical knowledge gap in integrated waste-to-value approaches by investigating the synergistic coupling of biogas purification effluent utilization with Chlorella vulgaris USU1 cultivation for lipid production. This novel integration facilitates simultaneous high-quality biofuel generation and significant CO2 utilization, thereby enabling absorbent regeneration in a closed-loop system. Utilizing packed absorption column-derived effluent (PACDE) containing KHCO3-PZCOO- complex solutions as the nutrient medium, this study systematically optimized cultivation parameters to maximize both biomass production and carbon utilization efficiency. Under optimized conditions (24:0 light intensity, 50-rpm agitation, 0.6 initial absorbance), the system achieved 58.3 % CO2 biofixation efficiency with a maximum biomass concentration of 8.64 g/L. Biochemical characterization revealed a composition of 23 % carbohydrates and 56 % proteins, with the fatty acid profile predominantly comprising palmitic (29.7 %), oleic (27.6 %), and linoleic (24.1 %) acids. Notably, the USU1 strain demonstrated superior lipid accumulation capability with 31.19 % yield, surpassing previously reported values for comparable strains. Economic analysis established favorable metrics with capital costs of IDR 4505/L, operating expenses of IDR 1155/L, and profit gained of IDR 8991/L, yielding a net profit of IDR 3331/L. Mass balance assessment demonstrated valorization of carbon inputs with approximately 2.97 kg CO2 annually while generating 1175 L of lipid-rich microalgae oil and 3745 L of reusable biofertilizer effluent. This research establishes a foundation for scalable and closed-loop carbon capture and utilization technologies with implications for industri

关键词： Gas fuel purification

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Linear Optics to Scalable Photonic Quantum Computing

arXiv

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arXiv 2025年

作者： Wayo, Dennis Delali Kwesi Goliatt, Leonardo Ganji, Darvish Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Al-Sultan Abdullah Kuantan26300 Malaysia Department of Computational and Applied Mechanics Federal University of Juiz de Fora Juiz de Fora36036-900 Brazil Jinju52851 Korea Republic of

Recent advancements in quantum photonics have driven significant progress in photonic quantum computing (PQC), addressing challenges in scalability, efficiency, and fault tolerance. Experimental efforts have focused on integrated photonic platforms utilizing materials such as silicon photonics and lithium niobate to enhance performance. Parameters like photon loss rates, coupling efficiencies, and fidelities have been pivotal, with state-of-the-art systems achieving coupling efficiencies above 90% and photon indistinguishability exceeding 99%. Quantum error correction schemes have reduced logical error rates to below 10-3, marking a step toward faulttolerant PQC. Photon generation has also advanced with deterministic sources, such as quantum dots, achieving brightness levels exceeding 106 photon pairs/s/mW and time-bin encoding enabling scalable entanglement. Heralded single-photon sources now exhibit purities above 99%, driven by innovations in fabrication techniques. High-efficiency photon detectors, such as superconducting nanowire single-photon detectors (SNSPDs), have demonstrated detection efficiencies exceeding 98%, dark count rates below 1 Hz, and timing jitters as low as 15 ps, ensuring precise photon counting and manipulation. Moreover, demonstrations of boson sampling with over 100 photons underscore the growing computational power of photonic systems, surpassing classical limits. The integration of machine learning has optimized photonic circuit design, while frequency multiplexing and time-bin encoding have increased system scalability. Together, these advances bridge the gap between theoretical potential and practical implementation, positioning PQC as a transformative technology for computing, communication, and quantum sensing. © 2025, CC BY.

关键词： Quantum computers

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