检索结果-内蒙古大学图书馆

2024 International Conference on Sustainable Energy: Energy Transition and Net-Zero Climate Future, ICUE 2024

作者： Jose, Diana Arshad, Nida Sriariyanun, Malinee Areeya, Sukunya Sivakumar, Rosshini Anand, Pooja R Tantayotai, Prapakorn The Sirindhorn Thai-German International Graduate School of Engineering King Mongkut's University of Technology North Bangkok Biorefinery and Process Automation Engineering Center Department of Chemical and Process Engineering Bangkok Thailand School of Chemical & Biotechnology Sastra Deemed University Thirumalaisamudram Thanjavur India Srinakharinwirot University Faculty of Science Department of Microbiology Bangkok Thailand

ISBN: (纸本)9798331517076

Given the substantial cellulose content in pineapple fruit peel, redirecting this waste towards second-generation biofuel production could significantly diminish the need for environmentally taxing on-field handling practices. The objective of this study was to investigate the potential of the fruit peel as a substitute cellulose source by analyzing its chemical composition. A pretreatment method utilizing Deep Eutectic Solvent (DES), a green solvent, which is composed of a blend of ethylene glycol and citric acid, was employed. The results revealed that the glucose and xylose content increased to 59.85% and 97.12%, respectively, after pretreatment. The total reducing sugar present in the untreated and pretreated samples was 0.057 g/g and 0.095 g/g respectively. Furthermore, an assessment of chemical structural alterations in the biomass was conducted to verify the efficacy of pretreatment. Therefore, this study confirmed the potential of this biomass as a biorefinery feedstock and it is expected to produce more value-added products from it. © 2024 IEEE.

关键词： Fruits

来源：评论

学校读者我要写书评

暂无评论

Rheological properties of cellulose nanocrystal suspension

引用

Materials Today: Proceedings 2022年 57卷 1356-1362页

作者： Mohd Shahabuddin, A. Alhuribi, H. Mohd Amin, K.N. Department of Chemical Engineering College of Engineering Universiti Malaysia Pahang Lebuhraya Tun Razak 26300 Gambang Pahang Kuantan Malaysia Faculty of Chemical and Process Engineering Technology College of Engineering Technology Universiti Malaysia Pahang Lebuhraya Tun Razak 26300 Gambang Pahang Kuantan Malaysia

Cellulose nanocrystal (CNC) is a unique nanomaterial that have received considerable attention due to its good individual mechanical properties and was proven as a good reinforcing filler to various polymer matrix. Thermoplastic polyurethane (TPU), have been widely used for lots of application like automobile, aerospace and medical industries. However, because of its chemical structure, TPU have significant deficiencies like low tensile strength as working with high force application. Thus, CNC has been used to overcome this limitation. This research was conducted to investigate the rheological properties of CNC in TPU and water matrix. CNC were obtained from microcrystalline cellulose (MCC) via sulphuric (CNC-S) and phosphoric (CNC-P) acid hydrolysis. CNCs (1 wt%, 2 wt% and 5 wt%) were dispersed in TPU and water matrix. CNC produced and its suspension were undergoing Field Emission Scanning Electron Microscopy (FESEM) and rheological test to identify the morphology and rheological behaviour respectively. CNC-S obtained has diameter of 17 ± 4 nm and length of 225 ± 100 nm, while CNC-P has diameter of 20 ± 5 nm and length of 231 ± 127 nm. The aspect ratio for CNC-P and CNC-S are 11 and 13 respectively. The rheology properties like viscosity of CNC-S were compared to CNC-P in both matrices. The viscosity of the TPU/CNC-S and TPU/CNC-P solutions recorded highest value at 5 wt% of CNC loading similar result was recorded as well in water matrix. In TPU, at shear rate of 0.1 s−1, the viscosity of TPU/CNC-S is 192.1 Pa.S and TPU/CNC-P solution is 173.4 Pa.S. Meanwhile, in aqueous suspension, at shear rate of 0.1 s−1, the viscosity of CNC-P recorded higher value than CNC-S suspension at 772,800 Pa.S and 1045 Pa.S respectively. This has proven that type of acid in CNC production and suspension matrix influence the rheological properties of CNC suspension. © 2022

关键词： Viscosity

来源：评论

学校读者我要写书评

暂无评论

Dielectric and Electrical Performance of Epoxy/CNC Nanocomposites for Biomaterial-Based Electrical Insulation 10

Dielectric and Electrical Performance of Epoxy/CNC Nanocompo...

引用

10th International Conference on Condition Monitoring and Diagnosis, CMD 2024

作者： Makmud, M.Z.H. Michael, M. Rahman, Tuan A. Z. Jamain, Z. Amin, K.N.M. Illias, H.A. Research Group Faculty of Science and Natural Resources Sabah Kota Kinabalu88400 Malaysia Mimos Berhad Mranti Technology Park IoT Systems Lab Bukit Jalil Kuala Lumpur57000 Malaysia College of Engineering Technology Universiti Malaysia Pahang Faculty of Chemical and Process Engineering Technology Pahang Malaysia Faculty of Engineering Department of Electrical Engineering Kuala Lumpur56000 Malaysia

ISBN: (纸本)9788986510225

The development of advanced electrical insulation materials is crucial for the sustainability and efficiency of electrical systems, particularly in high-voltage applications. This study investigates the influence of cellulose nanocrystal (CNC) nanofillers on the dielectric and electrical performance of epoxy composites, aiming to enhance the durability and effectiveness of biomaterial-based electrical insulation. Epoxy samples with varying CNC concentrations (0, 0.5, 1, 3, and 5 wt%) were prepared and characterized. Key performance indicators, including dielectric permittivity, dielectric loss, current-voltage response, and electrical discharge activity, were measured and analyzed. The results demonstrated a clear correlation between reduced real and imaginary permittivity, increased resistance, and improved discharge withstandability, highlighting the effectiveness of CNC as a nanofiller in enhancing the insulating properties of epoxy composites. These findings suggest a promising avenue for developing robust, high-performance electrical insulators capable of meeting the stringent demands of sustainable and environmentally friendly applications. © 2024 The Korean Institute of Electrical Engineers (KIEE).

关键词： Permittivity

来源：评论

学校读者我要写书评

暂无评论

Rheological properties of cellulose nanocrystals isolated via mechanical methods in thermoplastic polyurethane matrix

引用

Materials Today: Proceedings 2022年 57卷 1021-1026页

作者： Halim, N.H.A. Abdul Amin, K.N.M. Department of Chemical Engineering College of Engineering Universiti Malaysia Pahang Lebuhraya Tun Razak Gambang Pahang Kuantan26300 Malaysia Faculty of Chemical and Process Engineering Technology College of Engineering Technology Universiti Malaysia Pahang Lebuhraya Tun Razak Gambang Pahang Kuantan26300 Malaysia

Thermoplastic polyurethanes (TPU) are known for their versatility because they have both thermoplastic and elastomeric properties. Improvement of TPU properties can be accomplished by reinforcement with nanoscale fillers. Cellulose nanocrystals (CNC) are the most attractive nano-filler for reinforcement purposes in polymer matrices because of their high crystallinity and biodegradable materials. Mechanical methods to isolate CNC has sparked interest among researchers due to environmental demands (less solvent consumption). Lately, several researchers also have revealed some remarkable improvement of TPU through the addition of CNC. Thus, this study was aimed to produce CNC via mechanical methods for and to study the rheological properties of CNCs in the TPU matrix to gain insight interactions between CNCs and TPU. Isolation of CNCs via two methods: ultra-sonication (CNC-U) and nano-grinding (CNC-N) methods have been carried out. Then, the CNCs (0.5–2 wt%) were added into the TPU network employing the solution mixing method. The CNC was characterized via FESEM and the rheological behaviour was investigated on TPU/CNC solution. The main outcomes are that CNC-N has shown a higher aspect ratio (10–15), higher yield (>40%), and lower time and energy consumption than CNC-U. Rheological properties of TPU/CNC solution offer its structure-properties relationship via the increase in the concentration of CNCs. At 2 wt% concentration, TPU/CNC-N shows higher viscosity (19.5 Pa.s) than TPU/CNC-U (15.9 Pa.s). Thus, it was proven that the nanocomposite tends to act as a solid than liquid due to higher elastic behaviour. Furthermore, we can suggest the utilization of mechanical methods to produce a high yield of CNCs in notify the environmental issues. © 2021

关键词： Nanocomposites

来源：评论

学校读者我要写书评

暂无评论

Controlled release of niacinamide from fibrous silica nanocarrier in face serum formulation

引用

Materials Today: Proceedings 2024年 107卷 46-52页

作者： Nuramira Fateha binti Sukor Rohayu binti Jusoh Nur Syahirah binti Kamarudin Faculty of Chemical and Process Engineering Technology College of Engineering Universiti Malaysia Pahang 26300 Gambang Kuantan Pahang Malaysia

The current study offers controlled release of niacinamide from fibrous silica (KCC-1) loaded in a face serum formulation. Furthermore, three drug loading methods, namely physical mixing, melting, and solvent evaporation, denoted as (Phy)/Nia-KCC-1, (Mel)/Nia-KCC-1, and (Sol)/Nia-KCC-1, respectively, were implemented, and the percentage loading efficiencies were compared. (Mel)/Nia-KCC-1 demonstrated the highest percentage of drug loading at 33%, followed by (Phy)/Nia-KCC-1 and (Sol)/Nia-KCC-1 at 25% and 17%, respectively. Likewise, the in vitro release study also revealed a similar pattern, with (Mel)/Nia-KCC-1 recording the highest percentage release at 29%, followed by (Phy)/Nia-KCC-1 and (Sol)/Nia-KCC-1 at 24% and 21%, respectively. As the (Mel)/Nia-KCC-1 sample unveiled decent results in transporting the sample drug, the respective sample was then further loaded into the face serum formulation, and the pH stability was observed for 7 days. The pH readings remained constant at pH 4.3 throughout the 7 days, within the acceptance range according to the derma-cosmetic product that states the effective pH should lie between pH 4 and pH 6. Therefore, it can be stated that the (Mel)/Nia-KCC-1 loaded serum fulfills the acceptance criteria for the pH requirement of derma-cosmetic products.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Biomimetic alginate/perfluorocarbon microcapsules - the effect on in vitro metabolic activity and long-term cell culture

引用

chemical and process engineering - Inzynieria Chemiczna i Procesowa 2022年第1期43卷 81-95页

作者： Stefanek, Agata Kulikowska-Darlak, Aleksandra Bogaj, Karolina Nowak, Aleksandra Dembska, Joanna Ciach, Tomasz Biomedical Engineering Laboratory Faculty of Chemical and Process Engineering Warsaw University of Technology Warsaw00-645 Poland NanoSanguis S.A. Rakowiecka 36 Warsaw02-532 Poland

Cell encapsulation seems to be a promising tool in tissue engineering. However, it has been shown to have several limitations in terms of long-term cell cultures due to an insufficient oxygen supply. In this study we propose the use of novel microcapsules designed for long-term cell culture consisting of an alginate shell and perfluorocarbon (PFC) core, which works as a synthetic oxygen carrier and reservoir. The influence of PFC presence in the culture as well as the size of structures on cell metabolism was evaluated during 21-day cultures in normoxia and hypoxia. We showed significant improvement in cell metabolism in groups where cells were encapsulated in hydrogel structures with a PFC core. The cells maintained a typical metabolism (oxidative phosphorylation) through all 21 days of the culture, overcoming the oxygen supply shortage even in large structures (diameter > 1 mm). Applying PFC in alginate matrices can improve cell metabolism and adaptation in long-term cell cultures. © 2022. The Author(s)

关键词： Cell culture

来源：评论

学校读者我要写书评

暂无评论

NH_(4)Cl-assisted preparation of single Ni sites anchored carbon nanosheet catalysts for highly efficient carbon dioxide electroreduction

引用

Journal of Materials Science & technology 2023年第11期142卷 1-9页

作者： Dan Ping Feng Yi Guiwei Zhang Shide Wu Shaoming Fang Kailong Hu Ben Bin Xu Junna Ren Zhanhu Guo Henan Provincial Key Laboratory of Surface&Interface Science Henan Engineering Research Center of Chemical Engineering Separation Process IntensificationSchool of Material and Chemical EngineeringZhengzhou University of Light IndustryZhengzhou 450002China School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055China Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Chemical&Biomolecular Engineering Integrated Composites Lab(ICL)University of TennesseeKnoxvilleTN 37996USA

Single-atomic transition metal-nitrogen codoped carbon(M-N-C)are efficient substitute catalysts for noble metals to catalyze the electrochemical CO_(2) reduction reaction(CO_(2)RR).However,the uncontrolled aggregations of metal and serious loss of nitrogen species constituting the M-N_(x) active sites are frequently observed in the commonly used pyrolysis ***,single-atomic nickel(Ni)-based sheet-like electrocatalysts with abundant Ni-N_(4) active sites were created by using a novel ammonium chloride(NH_(4)Cl)-assited pyrolysis *** aberration correction electron microscopy and X-ray absorption fine structure analysis clearly revealed that Ni species are atomically dispersed and anchored by N in Ni-N_(4) *** addition of NH_(4)Cl optimized the mesopore size to 7-10 nm and increased the concentrations of pyridinic N(3.54 wt%)and Ni-N_(4)(3.33 wt%)*** synergistic catalytic effect derived from Ni-N_(4) active sites and pyridinic N species achieved an outstanding CO_(2) RR performance,presenting a high CO Faradaic efficiency(FE_(CO))up to 98% and a large CO partial current density of 8.5 mA cm^(-2) at a low potential of-0.62 V ***,the FE_(CO) maintains above 80% within a large potential range from -0.43 to -0.73 V *** work provides a practical and feasible approach to building highly active single-atomic catalysts for CO_(2) conversion systems.

关键词： CO_(2)reduction Electrocatalyst Single-atomic ni NH_(4)Cl Pyridinic N

来源：评论

学校读者我要写书评

暂无评论

Evaluation of antioxidant and anti-tyrosinase activities of surfactant and alcohol extracted Combretum Indicum leaves 6

Evaluation of antioxidant and anti-tyrosinase activities of ...

引用

6th National Conference on Postgraduate Research, NCON-PGR 2022

作者： Thanaseelan, Tanesha Nurul Hidayu, D. Sahirah, Nurul Rajaletchumy, V.K. Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Kuantan Pahang26300 Malaysia

Combretum Indicum (CI), which contains numerous bioactive compounds, has been used in traditional medicine for a variety of reasons, including the treatment of skin conditions. This study investigates the antioxidant and anti-tyrosinase activities of CI leaves extracted using different surfactants (Triton X-100 and Vitamin E TPGS) at concentrations of 1%, 2%, and 3%, as well as various alcohol solvents (acetone, methanol, and ethanol) at concentrations of 50%, 70%, and 90%. The antioxidant activity of the extracts has been evaluated using Total Phenolic Content (TPC) and 2,2-diphenyl-1-picrylhydrazyl (DPPH), while the anti-tyrosinase activity was assessed through a mushroom tyrosinase inhibition assay. Prior to analysis, CI leaves had been macerated, extracted, and freeze-dried. The research established that ethanol at a concentration of 50% is the optimum solvent to extract CI leaves, as it demonstrated good antioxidant and anti-tyrosinase action with a high percentage of yield and total phenolic content. As a result, the outcomes of this study contribute to a better understanding of the potential applications of CI leaf extract in cosmetics, notably in the treatment of oxidative stress and hyperpigmentation. Further study and development in this field could lead to the creation of effective and natural cosmetic products produced from CI leaves that have antioxidant and anti-tyrosinase effects. © 2022 Elsevier Ltd. All rights reserved.

关键词： Medicinal chemistry

来源：评论

学校读者我要写书评

暂无评论

Analysis of volatile composition released from torrefaction of empty fruit bunch

引用

Materials Today: Proceedings 2022年 57卷 1202-1207页

作者： Abdul Samad, Noor Asma Fazli Saleh, Suriyati Chemical Engineering Department College of Engineering Universiti Malaysia Pahang Lebuhraya Tun Razak Gambang Pahang26300 Malaysia Faculty of Chemical & Process Engineering Technology Universiti Malaysia Pahang Lebuhraya Tun Razak Gambang Pahang26300 Malaysia

This paper presents the effect of torrefaction on constituents of empty fruit bunch (EFB) and volatile components analysis. Different torrefaction temperature ranging from 240 to 300 ℃ are employed where hemicellulose has been decomposed significantly. Cellulose and lignin show only slight degradation at investigated temperature. Volatile released from torrefaction of EFB has been collected and analyzed where only carbon monoxide and carbon dioxide non-condensable volatile components are detected. The two highest volatile fractions detected for condensable components are water and acetic acid. The formation of non-condensable and condensable volatile components are originated from dehydration and decarboxylation mechanisms during decomposition of hemicellulose. © 2021

关键词： Cellulose

来源：评论

学校读者我要写书评

暂无评论

Biomordant assisted natural dyeing of cellulosic fibre: a greener approach

引用

Materials Research Innovations 2025年第1期29卷 27-34页

作者： Chowdhury, Tanvir Ahmed Khandaker, Jahirul Islam Gafur, Mohammad Abdul Repon, Md. Reazuddin Islam, Md. Kamrul Hossain, Alamgir Mollick, Swaraz Department of Physics Jahangirnagar University Dhaka Bangladesh Department of Textile Engineering Daffodil International University Dhaka Bangladesh Pilot Plant & Process Development Centre Bangladesh Council of Scientific and Industrial Research 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 Department of Textile Engineering Jashore University of Science and Technology Jashore Bangladesh

Natural dyes serve as a benign alternative to their synthetic counterparts, offering a sustainable option that directly mitigates the release of toxic chemicals. In this study, cotton fabrics were dyed with neem leaf extract in acidic, neutral and alkaline condition where samples were mordanted with lemon juice. The findings revealed a direct correlation between colour strength (K/S) and pH levels, and optimal fastness properties were achieved under alkaline pH conditions when a mordant was employed. The Energy Dispersive X-ray (EDX) ensured the elemental composition of lemon juice assisted dyed fabric which indicates the effective binding of cotton fabric with neem leaves extracted dye. The Fourier Transform Infrared (FTIR) Spectroscopy analysis also confirmed the interaction of cotton fabric with dye particles. The results indicate that cotton fabric can be successfully dyed with neem leaf extract and lemon juice as the biomordant, presenting an eco-friendly and sustainable approach to dyeing practices. © 2024 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Cotton fabrics

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：