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Novel spent bleaching earth industrial waste as low-cost ceramic membranes material: elaboration and characterization

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materials Today: Proceedings 2023年 87卷 136-140页

作者： Rahma A. Elma M. Roil Bilad M. Isnasyauqiah Rahman Wahid A. Sirajul Huda M. Resa Lamandau D. Doctoral Program of Environemntal Science Postgraduate Program Lambung Mangkurat University Jl Brigjen H. Hasan Basri Kayutangi South Kalimantan Banjarmasin 70123 Indonesia Materials and Membranes Research Group (M2ReG) Lambung Mangkurat University Jl A. Yani Km 36 South Kalimantan Banajrbaru 70714 Indonesia Chemical Engineering Department Engineering Faculty Lambung Mangkurat University Jl A. Yani Km 36 South Kalimantan Banajrbaru 70714 Indonesia Faculty of Integrated Technologies Universiti Brunei Darussalam Gedung BE1410 Brunei Darussalam

Ceramic membrane support derived from spent bleaching earth (SBE) become a novel study due to their low-cost, sustainable features, abundance material, and there is not yet applicated as membrane. In this study, flat disk ceramic membrane configuration was fabricated and characterized from solid waste of crude palm oil bleaching process by pressing method in different SBE loading mass (38–42 %wt.). The SBE as raw material was deoiled using n-hexane and acetone solvent, followed by fabricated it become flat disk SBE membranes. Afterward, the SBE flat disk membranes was characterized through fourier-transform infrared spectroscopy (FTIR) and X-ray fluorescence (XRF) analyzer. The result exhibits the flat disk SBE ceramic membrane has dimension of 41 and 6 mm for diameter and thickness, respectively. SBE membranes indicating have montmorillonite structure due to presence of silica as main component materials of SBE. Besides that, the existence of siloxane vibration band in SBE membranes for the sample after regeneration with n-hexane and acetone were dominated over using raw SBE. It concludes the oil residue was removed and produced SBE membrane properties become robust with less organic contaminant. © 2023

关键词： Ceramic membrane CPO Pressing method SBE Support

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Unveiling Activated Carbon Degradation in Supercapacitor Using Liquid Cell Transmission Electron Microscopy

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SSRN 2024年

作者： Tan, Daniel Q. Chen, Junyan Rao, Xinqiang Zhang, Fuming Ein-Eli, Yair Department of Materials Science and Engineering Guangdong Technion-Israel Institute of Technology 241 Daxue Road Shantou515063 China Department of Materials Science and Engineering Technion-Israel Institute of Technology Haifa3200003 Israel The Nancy and Stephen Grand Technion Energy Program Technion-Israel Institute of Technology Haifa3200003 Israel Guangdong Provincial Key Laboratory of Materials and Technology for Energy Conversion Guangdong Technion-Israel Institute of Technology 241 Daxue Road Shantou515063 China

Electrode stability critically impacts energy storage device performance, and despite theoretical recognition, directly observing the evolving electrode-electrolyte interface during the charge-discharge cycle of a supercapacitor remains challenging. This work directly addresses the technical gap by employing a liquid cell-assisted in-situ transmission electron microscopy. This innovative approach realizes real-time observation of the dynamic response of the activated carbon electrode during an electrical cycling of the supercapacitor cells. Driving the cell potential above a certain threshold potential during cycling leads to gas evolution that initiates cascade of events, causing the active carbon to disintegrate. This is being manifested in electrode’s mass loss and a rapid capacity decline upon further cycling. Nano-layer oxide coating of the activated carbon electrode using an atomic layer deposition effectively suppresses electrode-electrolyte reactions, stabilizing the electrode and improving the electrochemical properties. The first in-situ transmission electron microscope liquid cell design using an activated carbon substrate represents a breakthrough in understanding supercapacitors degradation, offering a working strategy for electrode dynamics investigation of various energy storage devices. © 2024, The Authors. All rights reserved.

关键词： Atomic layer deposition

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Methods of Printing Copper for PCB Repair

Methods of Printing Copper for PCB Repair

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Electronic Components and Technology Conference (ECTC)

作者： Dylan J. Richmond Emuobosan Enakerakpo Mohammed Alhendi Peter McClure Mark D. Poliks Materials Science &#x0026 Engineering Program Binghamton University Binghamton NY Department of Systems Science Industrial Engineering Binghamton University Binghamton NY Universal Instruments Corporation Conklin NY

Damage and defects that occur in printed circuit board assembly (PCBA) often lead to the disposal of expensive components. In cases where laminate and circuitry have been removed, traditional repairs in the manufacturing process have not been able to return devices into service. This study examines the use of aerosol jet printing (AJP) and traditional engineering fluid dispensing (EFD) as methods to service repairs of damaged *** mount component failures on PCBAs may occur as a result of a bad solder joint or problems with the component. In order to salvage such a PCBA, the component must be physically removed from the board and a new be attached. During the removal of PCBA components, pad cratering may occur, where the pad and laminate are damaged/removed along with the component. This leaves behind a crater in place of the pad, rendering the board unrepairable and thus, unusable. Trace damage is another common failure in PCBs. A repair to either sort of damage often requires reconnections of intricate circuitry to be made. Trace repair has traditionally been serviced by soldering a wire between the undamaged regions, rerouting the connection. In the case of fine conductive traces, as seen in devices which are becoming smaller as heterogeneous packaging innovations continue to progress, traditional methods will not be able to service this sort of *** jet printing, a direct-write additive manufacturing process commonly used in flexible hybrid electronics, could save expensive PCBs by repairing cratered pads and damaged traces. The use of AJP has been successful in repairing damaged modules, however the process has not been optimized for general repairs on FR4. The use of AJP and EFD to repair damaged circuitry on FR4 laminate and to fill pad craters with copper nanoparticle ink is demonstrated. Copper ink structures are uniformly sintered to achieve a solderable surface and good adhesion to the exposed laminate and remaining copper on the PCB. P

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Utilization of Pineapple Crown Fiber and Recycled Polypropylene for Production of Sustainable Composites

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Journal of Renewable materials 2020年第10期8卷 1327-1341页

作者： Alexandra Augusta Reichert Mariana Ribas de Sá Gabriela Escobar Hochmuller da Silva Cesar Augusto Gonçalves Beatrice AndréRicardo Fajardo Amanda Dantas de Oliveira Postgraduate Program in Materials Science and Engineering(PPGCEM) Federal University of Pelotas(UFPel)Pelotas96075-630Brazil Technology Development Center(CDTec) Materials EngineeringFederal University of Pelotas(UFPel)Pelotas96075-630Brazil Postgraduate Program in Materials Science and Engineering(PPGCEM) Federal University of São Carlos(UFSCar)São Carlos13565-905Brazil Laboratory of Technology and Development of Composites and Polymeric Materials Federal University of Pelotas(UFPel)Pelotas96010-900Brazil

Nowadays,the production of consumer goods is based on the use of non-renewable raw materials,which in recent years has been performing as a problem for the *** the large number of available biofibers in nature,their use in the development of polymeric composites has inevitably emerged,it is also necessary to take into account the countless discarded plastics that still have the potential to be *** this work,fibers were extracted from pineapple crown residues and utilized to compose sustainable composites using recycled polypropylene from cups discarded in the trash as a ***,it is known that for good performance,it is necessary to achieve a good chemical interaction between the fiber and the *** order to improve this interaction,alkaline mercerization treatment was carried out on the surface of the fibers removing some components incompatible with the *** this work,the effect of the mercerization treatment on the properties of the fibers was studied,as well as their interaction with the *** effect of fiber concentration on the mechanical and thermal properties of composites was also *** of 5 and 7 wt%were used for both natural and mercerized fibers.A decrease in the number of degradation stages was observed through thermogravimetry analyses(from four in natural fiber to two in mercerized fibers),showing that the mercerization performed on the fibers was *** increase in the degree of crystallinity of mercerized fibers was also observed through the results of X-ray *** techniques indicate that amorphous compounds,such as hemicellulose and lignin,were partially *** the tensile test,it could be noted that all composites presented higher values of de elastic modulus than recycled polypropylene without added load;however,there were no differences in the elastic modulus between the different types of fibers and load ***,it is interesting to use fibers as r

关键词： Recycling composites polypropylene biofibers pineapple crown

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Optimization of Printing Parameters for Printing of Ordinary Portland Cement using a Custom-made 3D Printer 21

Optimization of Printing Parameters for Printing of Ordinary...

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21st International Union of materials Research Societies International Conference in Asia, IUMRS-ICA 2021

作者： Chaiyotha, D. Pinitsoontorn, S. Chindaprasirt, P. Payakaniti, P. Materials Science and Nanotechnology Program Department of Physics Faculty of Science Khon Kaen University Khon Kaen40002 Thailand NANOTEC -KKU RNN on Nanomaterials Research and Innovation for Energy Khon Kaen University Khon Kaen40002 Thailand Sustainable Infrastructure Research and Development Center Department of Civil Engineering Faculty of Engineering Khon Kaen University Khon Kaen40002 Thailand

3D printing techniques have recently received a lot of attention as a new technique for forming construction materials, due to benefits over the traditional cast. In this research, ordinary Portland cement (OPC) paste was formed using a 3D extruder. Optimized mixture and printing parameters were determined. Compressive strengths of the printed and the traditionally casted OPC paste were measured after the specimens were cured in saturated limewater for 7, 14 and 28 days, respectively. The result led to the conclusion that the most suitable mixture for printing was achieved at the water to cement ratio of 0.35 with water reducing and retarding admixture added. The optimum printing parameters were the printing speed of 60 mm/min and the feed rate of 120 ml/s. Compressive strength of the 5 x 5 x 5 cm3 hollowed and filled cubic printed specimens, were compared with casted cement paste. The strengths of both the printed and the casted specimens were higher with longer curing durations. The highest levels of strength were achieved at 12.36 MPa on the printed specimens and 80.88 MPa when testing the casted samples. © Published under licence by IOP Publishing Ltd.

关键词： 3D printers

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Efficient copper plating on glass substrates through amine-functionalized nanocomposite-immobilized silver nanoparticles

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Colloids and Surfaces A: Physicochemical and engineering Aspects 2024年 688卷

作者： Chiang, Tang-Lun Cheng, An-Yu You, Jhu-Lin Chang, Chang-Pin Ger, Ming-Der School of Defense Science Chung Cheng Institute of Technology National Defense University Taoyuan335 Taiwan Department of Chemical & Materials Engineering Chung Cheng Institute of Technology National Defense University Taoyuan335 Taiwan System Engineering and Technology Program National Chiao Tung University Hsinchu300 Taiwan

Amine-functionalized silver nanocatalyst was synthesized using polyethyleneimine (PEI) and glutaraldehyde (GA) and applied to electroless copper on the glass substrate. The formation mechanism of the polyethyleneimine-glutaraldehyde (PEI-GA) was firstly analyzed, then the polyethyleneimine-glutaraldehyde-silver (PEI-GA-Ag) was measured, which showed that the silver nanoparticles (AgNPs) were spherical with an average size of about 5 nm and a narrow particle distribution, and PEI-GA-Ag was analyzed by UV-Vis to demonstrate the synthesized AgNPs were uniformly dispersed and stable without agglomeration for a period of 10 months. The application of PEI-GA-Ag nanocomposite in the glass metallization process resulted in the formation of a complete, uniform copper layer on grit-blasted glass, which passed adhesion tests successfully without flaking. After 10 mins of electroless copper plating, the thickness of the copper layer is approximately 1 µm, displaying a sheet resistance of 0.018 Ω/square, and the resistivity is 1.8×10−6 Ωcm, which is close to that of a bulk copper. This proposes that PEI-GA-Ag has excellent stability and catalytic efficiency and can be effectively used in electroless plating processes to replace conventional expensive palladium colloid catalysts. © 2024 Elsevier B.V.

关键词： Silver nanoparticles

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A robust bendable IrO_x thin film via mild alkaline solution process for neuron stimulating electrodes

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Surfaces and Interfaces 2024年 44卷

作者： Tso, Kuang-Chih Chan, Tzu-Ying Yu, Tsung-Chun Tao, Yu-Jen Chu, Chao-Yi Chen, San-Yuan Lee, Jyh-Fu Ohta, Jun Chen, Po-Chun Wu, Pu-Wei Graduate Program of Accelerator Light Source National Yang Ming Chiao Tung University Hsinchu 300 Taiwan Division of Materials Science Graduate School of Science and Technology Nara Institute of Science Technology Nara Ikoma Takayama 8916-5 Japan Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu 300 Taiwan Institute of Materials Science and Engineering National Taipei University of Technology Taipei 106 Taiwan National Synchrotron Radiation Research Center Hsinchu 300 Taiwan

We demonstrate a unique chemical formula to deposit hydrous iridium oxide thin film on a platinum-coated polyimide substrate. In a mild alkaline solution, the iridium (III) precursor undergoes the ligand exchange and hydrolysis reaction to become the iridium (III) dimers that are physically adsorbed on the substrate for subsequent heterogeneous condensation and growth of amorphous hydrous iridium oxide thin film. Both UV–Vis and X-ray absorption spectroscopy (XAS) are employed to determine the reaction steps involved. The chemical nature and crystallinity of the hydrous iridium oxide thin film are investigated by XAS, X-ray photon spectroscopy, and X-ray diffraction. The hydrous iridium oxide thin film reveals an impressive normalized charge storage capacity (CSC) of 0.3 mC/cm²-nm and a low impedance (80.5 Ω) at 1k Hz. In addition, in bending test of 3,000 cycles, the hydrous iridium oxide thin film retains 91.2 % of its initial normalized CSC without any physical crack and delamination. The cell viability test suggests negligible bio-toxicity. Our results provide a solid evidence of fabricating a robust flexible electrode for neural interfaces for potential use in implantable electronic devices. © 2023 Elsevier B.V.

关键词： Bio-electrode Flexible substrate Implantable electronic devices Iridium dimers Iridium oxide Polyimide

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Atomistic mechanisms of the initial oxidation of stepped Cu3Au(100)

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Physical Review B 2022年第7期105卷 075422-075422页

作者： Yaguang Zhu Dongxiang Wu Chaoran Li Xiao Tong J. Anibal Boscoboinik Jerzy T. Sadowski Guangwen Zhou Department of Mechanical Engineering & Materials Science and Engineering Program State University of New York Binghamton New York 13902 USA Center for Functional Nanomaterials Brookhaven National Laboratory Upton New York 11973 USA

Alloy oxidation is complex and involves several critical processes that lack understanding on the atomic level. Here, we report an atomistic picture of the initial-stage oxidation of stepped Cu3Au(100) using a combination of surface science tools and modeling to illuminate the microscopic processes underlying oxygen-adsorption-induced structural and compositional changes. Pristine Cu3Au(100) consists of wide CuAu-terminated terraces and narrow Cu-terminated terraces separated by monatomic steps. Counterintuitive to the common expectations of the adsorbate-induced surface segregation of the more reactive alloy component, our observations demonstrate that the oxygen adsorption leads to the exfoliation of the outermost CuAu layer, thereby exposing the inner Cu plane to O attack. This occurs via the oxygen-assisted abstraction of Au and Cu atoms from step edges and CuAu terraces, which generates many Cu adatoms aggregating into Cu clusters and Au adatoms dissolving into the bulk. The oxygen adsorption onto fourfold hollow sites of the exposed Cu plane results in nucleation and growth of the c(2×2)−O superstructure, which can be fit well by the Johnson-Mehl-Avrami-Kolmogorov theory with a site-saturated nucleation mechanism.

关键词： Surface & interfacial phenomena Alloys Surfaces Density functional theory Ion beam analysis Scanning tunneling microscopy X-ray photoelectron spectroscopy

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Enhancing Pharmaceutical Wastewater Treatment: Ozone-Assisted Electrooxidation and Precision Optimization Via Response Surface Methodology

SSRN

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SSRN 2023年

作者： Phan, Huy N.Q. Leu, Jyh Hoang Nguyen, Vi N.D. Department of Materials Science and Engineering Feng Chia University Taichung40744 Taiwan Master’s Program of Green Energy Science and Technology Feng Chia University Taichung40744 Taiwan Department of Chemical Engineering Feng Chia University Taichung40744 Taiwan

In this study, the treatment of pharmaceutical wastewater was conducted using electrooxidation (EO) and ozone-assisted electrooxidation (EO/O3) with Pt-coated Ti electrodes (Pt/Ti). The removal of chemical oxygen demand (COD), color, and the UV absorption peak at 300 nm (UV300) was investigated in a batch mode reactor. Highly significant quadratic regression models for both processes were revealed through experimental design and optimization using the Box-Behnken Design (BBD) methodology. Current density, initial pH, and electrolysis time were assigned as independent variables for the statistical models. Under optimal conditions of 110.63 A m−2 current density and an initial pH of 4.5 for 477 minutes, stand-alone electrooxidation achieved the removal of 70.5% of COD, 81.25% color reduction, and a 40.01% decrease in UV300. In contrast, ozone-assisted electrooxidation performed even more effectively, with the removal of 84% for COD, 99.43% for color, and 49.63% for UV300. These results were obtained under optimal conditions of 150 A m−2 current density and an initial pH of 8.79 for 480 minutes. In addition, positive results in the kinetic study also gave this study an appeal. It was seen that ozone-assisted electrooxidation is an effective method for the pharmaceutical wastewater treatment. © 2023, The Authors. All rights reserved.

关键词： Ozone

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Effect of surface segregation on the oxidation resistance of Cu3Pt(100)

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Physical Review materials 2022年第2期6卷 025801-025801页

作者： Chaoran Li Yaguang Zhu Dongxiang Wu Jorge Anibal Boscoboinik Guangwen Zhou Department of Mechanical Engineering and Materials Science and Engineering Program State University of New York at Binghamton New York 13902 USA Center for Functional Nanomaterials Brookhaven National Laboratory Upton New York 11973 USA

Alloying element segregation often occurs under a reactive environment but its interplay with the subsequent surface oxidation of the alloy remains unclear. Using synchrotron-based ambient-pressure x-ray photoelectron spectroscopy, we dynamically monitor the surface segregation in Cu3Pt(100) in response to temperature and oxygen gas. Vacuum annealing leads to surface segregation of Cu along with the enrichment of Pt in the subsurface region. Upon switching to the O2 atmosphere, dissociative chemisorption of oxygen does not change the surface segregation profile from that under the vacuum annealing condition. A stepwise increase in the oxygen pressure results in the transformation pathway of Cu→Cu2O→CuO, in which the selective oxidation of Cu gives rise to further accumulation of Pt underneath the oxide/alloy interface that hinders the supply of Cu from the bulk to the oxide/alloy interface, thereby leading to the termination of the surface oxidation after the Cu2O→CuO conversion is completed. This differs from the transformation pathway of Cu→Cu2O→Cu2O/CuO for the oxidation of pure Cu and Cu-Au alloys, in which the oxidation of Cu continues and the Cu2O/CuO bilayer growth is constantly maintained. These key differences provide useful insight into alloy design for controlling the surface properties such as corrosion resistance and catalytic performance of Cu base alloys.

关键词： Surface & interfacial phenomena Alloys X-ray photoelectron spectroscopy

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