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Dual template using P123-gelatin for synthesized large mesoporous silica for enhanced adsorption of dyes

South African Journal of Chemical engineering 2023年 43卷 312-326页

作者： Safitri, Widiya Nur Habiddin, Habiddin Ulfa, Maria Trisunaryanti, Wega Bahruji, Hasliza Holilah, Holilah Rohmah, Alya Awinatul Sholeha, Novia Amalia Jalil, Aishah Abdul Santoso, Eko Prasetyoko, Didik Department of Chemistry Faculty of Science and Data Analytics Institut Teknologi Sepuluh Nopember East Java Keputih Sukolilo Surabaya 60111 Indonesia Chemistry Education Study Program Faculty of Teacher Training and Education Universitas Sebelas Maret Jl. Ir. Sutami 36A Surakarta 57126 Indonesia Department of Chemistry Faculty of Science Universitas Gadjah Mada Sekip Utara Sleman Indonesia Centre for Advanced Material and Energy Sciences Universiti Brunei Darussalam Bandar Seri Begawan BE 1410 Brunei Darussalam Research Center for Biomass and Bioproducts National Research and Innovation Agency of Indonesia (BRIN) Cibinong 16911 Indonesia Department of Food Science and Technology Faculty of Agriculture Halu Oleo University Indonesia College of Vocational Studies Bogor Agricultural University (IPB University) Jalan Kumbang No. 14 Bogor 16151 Indonesia Department of Chemical Engineering Faculty of Chemical and Energy Engineering Universiti Teknologi Malaysia 81310 UTM Johor Skudai Johor Bahru Malaysia

Mesoporous Silica with a large mesopore channel was synthesized using the sol-gel method for dye adsorption. A dual template consisting of P123 and gelatin at different ratios was employed in the sol-gel synthesis to enhance surface area and mesopore diameter. Gelatin is a green pore directing agent that strengthens P123 thermal stability during the calcination of silicate gel. Optimization of P123:gelatin ratio to 1:0.02 increased the surface area of mesoporous silica to 561.9 m²/g and expanded the pore diameter to 10 nm. The large pore diameter and surface area enhanced methylene blue adsorption capacity to 363.63 mg/g. The adsorption of methylene blue on mesoporous silica follows the pseudo second-order kinetic and the Langmuir model. Regeneration studies using thermal and chemical treatments exhibited the potential of mesoporous silica as an adsorbent for multiple adsorption-desorption of dyes. © 2022 The Author(s)

关键词： Dual template Dye Gelatin Mesoporous silica Pluronic P123

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Room-temperature performance of double-fused 1.54 /spl mu/m vertical-cavity laser

Room-temperature performance of double-fused 1.54 /spl mu/m ...

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Indium Phosphide and Related materials Conference

作者： D.I. Babic K. Streubel R.P. Mirin J. Piprek N.M. Margalit J.E. Bower E.L. Hu D.E. Mars L. Yang K. Carey Department of Electrical and Computer Engineering University of California Santa Barbara USA Department of Electronics Royal Institute of Technology Stockholm Sweden Materials Science Program University of Delaware Newark USA Hewlett Packard Laboratories Palo Alto CA USA

The progress in understanding wafer-fused vertical-cavity lasers and improvements in fabrication techniques have led to the realization of the first room-temperature continuous-wave operating 1.54-/spl mu/m vertical-cavity lasers. By demonstrating continuous-wave operation at room temperature using vertical-cavity lasers fabricated by two wafer fusion steps, we have shown that wafer fusion is a viable technique. The lasers comprise strain compensated InGaAsP quantum-well active layers sandwiched between two AlGaAs/GaAs quarter-wave mirrors. Characteristics discussed include cavity losses, the gain-current density relationship, and voltage-current characteristics.

关键词： Vertical cavity surface emitting lasers Mirrors Optical pulse generation Absorption Pulse measurements Quantum well lasers Doping Temperature Propagation losses Size measurement

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High-temperature thermal transport properties of a single-grain decagonal Al74Ni10Co16 quasicrystal

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Physical Review B 2003年第10期68卷 104202-104202页

作者： J. A. Barrow B. A. Cook P. C. Canfield D. J. Sordelet Materials Chemistry Program Ames Laboratory Ames Iowa 50011 USA Department of Chemistry Iowa State University Ames Iowa 50011 USA Metal and Ceramic Sciences Program Ames Laboratory Ames Iowa 50011 USA Department of Materials Science and Engineering Iowa State University Ames Iowa 50011 USA Condensed Matter Physics Program Ames Laboratory Ames Iowa 50011 USA Department of Physics and Astronomy Iowa State University Ames Iowa 50011 USA

Thermal transport properties have been determined for a decagonal Al74Ni10Co16 quasicrystal in the temperature range 373–873 K. Differential scanning calorimetry and a laser flash method were employed in the determination of heat capacity and thermal diffusivity, respectively. Thermal conductivity was determined from the product of diffusivity, heat capacity, and density. A high degree of anisotropy was observed between the aperiodic and periodic axes. The anisotropic heat flow is described using the thermal ellipsoid model. The model was applied to a surface oriented 45° to the major axes and substantiated from bulk measurements obtained from a sample cut along this orientation. Within this temperature range, the thermal transport of this two-dimensional quasicrystal may be described in a manner similar to anisotropic metallic single crystals.

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Cortex Inspired Model for Inverse Kinematics Computation for a Humanoid Robotic Finger

Cortex Inspired Model for Inverse Kinematics Computation for...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： Rodolphe J. Gentili Hyuk Oh Javier Molina James A. Reggia José L. Contreras- Vidal Department of Kinesiology School of Public Health Maryland Robotics Center Neuroscience and Cognitive Science Program University of Maryland College Park MD 20742 USA Neuroscience and Cognitive Science Program University of Maryland College Park MD 20742 USA Department of Systems Engineering and Automation Technical University of Cartagena 30202 Cartagena Spain Department of Computer Science University of Maryland Institute for Advanced Computer Studies University of Maryland College Park MD 20742 USA Department of Electrical and Computer Engineering University of Houston Houston TX 77004 USA

ISBN: (纸本)9781424441198

In order to approach human hand performance levels, artificial anthropomorphic hands/fingers have increasingly incorporated human biomechanical features. However, the performance of finger reaching movements to visual targets involving the complex kinematics of multijointed, anthropomorphic actuators is a difficult problem. This is because the relationship between sensory and motor coordinates is highly nonlinear, and also often includes mechanical coupling of the two last joints. Recently, we developed a cortical model that learns the inverse kinematics of a simulated anthropomorphic finger. Here, we expand this previous work by assessing if this cortical model is able to learn the inverse kinematics for an actual anthropomorphic humanoid finger having its two last joints coupled and controlled by pneumatic muscles. The findings revealed that single 3D reaching movements, as well as more complex patterns of motion of the humanoid finger, were accurately and robustly performed by this cortical model while producing kinematics comparable to those of humans. This work contributes to the development of a bioinspired controller providing adaptive, robust and flexible control of dexterous robotic and prosthetic hands.

关键词： reaching prosthetic providing

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Achieving dimensional stability using functional fillers

Achieving dimensional stability using functional fillers

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46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and materials Conference

作者： Weyer, Wayne C. Cross, William M. Henderson, B. Kellar, Jon J. Kjerengtroen, Lidvin Welsh, Jeffry Starkovich, John South Dakota School of Mines and Technology Rapid City SD 57701 United States Air Force Research Laboratory Space Vehicles Directorate Kirtland AFB NM 87117 United States Northrop-Grumman Space Technologies Redondo Beach CA 90278 United States Department of Mechanical Engineering 501 E. St. Joseph St. United States Materials Engineering and Science Program 501 E. St. Joseph St. United States Department of Materials and Metallurgical Engineering 501 E. St. Joseph St. United States Integrated Structural Systems Bldg. 472 3550 Aberdeen Ave SE United States NGST Structures and Mechanisms Product Center Mail Stop R4-2112 One Space Park

Several materials exhibiting negative coefficients of thermal expansion have recently been identified. Such materials incorporated as filler in a polymer matrix should result in a composite with reduced, if not zero, expansion when exposed to elevated temperatures. One such filler material, ZrW 2O8, has a highly negative coefficient of thermal expansion and its cubic structure leads to isotropic thermal behavior. Consequently, Zr2WO8 was investigated as functional filler for polymer matrices, with the goal being improved dimensional stability of the filled system. The choice of polymeric matrix material is also crucial when seeking dimensional stability, and fabrication of a useful end product. In this regard, several aerospace grade epoxies along with a novel cyanate ester resin were investigated. The dynamic mechanical properties along with thermal behavior of the filled systems were compared. A cyanate ester/ZrW2O 8 system exhibited the lowest coefficient of thermal expansion (CTE), and consequently was investigated in most detail. Cylindrical samples of the cyanate ester/ZrW2O8 system were molded and cured per schedule. The ZrW2O8 particles were allowed to settle at their natural rate. Thus, the final samples contained various weight percentages and sizes of ZrW2O8. The sectioned samples allowed investigation of filler percent and how it impacts overall CTE. Decreases in CTE of ∼80% are reported for samples containing ∼82 wt% ZrW 2O8. The lowest value observed for composite CTE was 2.8 ppm/K at 32 °C for a sample having 83% zirconium tungstate, which had been subject to one temperature cycle. Copyright © 2005 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Fillers

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Incorporating nanoparticles in 3D printed scaffolds for bone cancer therapy

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Bioprinting 2023年 36卷

作者： Al Sawaftah, Nour M. Pitt, William G. Husseini, Ghaleb A. Materials Science and Engineering Program College of Arts and Sciences American University of Sharjah Sharjah PO Box: 26666 United Arab Emirates Chemical Engineering Department Brigham Young University Provo UT United States Chemical and Biological Engineering Department College of Engineering American University of Sharjah Sharjah PO Box: 26666 United Arab Emirates

The low occurrence rate of bone cancer contributes to delayed diagnosis and treatment;in addition, the surgical resection of bone tumors can cause significant bone defects, further hindering the effective treatment of the disease. 3D printing can help overcome some of these limitations by enabling the design and fabrication of innovative scaffolds loaded with chemotherapeutics and growth factors, stimulating bone regeneration, and delivering targeted cancer treatment. Moreover, advancements in nanotechnology have opened up new possibilities for bone tissue engineering. Nanoparticles (NPs) possess size-dependent physicochemical properties. NPs can also be designed to respond to specific stimuli enhancing localized drug delivery. These unique properties can be harnessed by embedding NPs in 3D-printed scaffolds to develop multifunctional bone scaffolds with enhanced mechanical properties and drug delivery capabilities. This review evaluates the impact of incorporating NPs in 3D-printed scaffolds on bone cancer therapy and bone regeneration. First, various 3D printing techniques employed in the biomedical field are presented and explained. The article then highlights notable achievements by researchers in this area. Finally, the review discusses the current obstacles facing this technology and how they can be addressed to enable translation into clinics. © 2023 The Authors

关键词： 3D printing Bone cancer Cancer therapy Nanoparticles Stimulus

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Transformation between elastic dipoles, quadrupoles, octupoles and hexadecapoles driven by surfactant self-assembly in nematic emulsion

arXiv

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arXiv 2022年

作者： Senyuk, Bohdan Mozaffari, Ali Crust, Kevin Zhang, Rui de Pablo, Juan J. Smalyukh, Ivan I. Department of Physics and Soft Materials Research Center University of Colorado Boulder CO United States Pritzker School of Molecular Engineering The University of Chicago ChicagoIL United States Department of Physics The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Center for Molecular Engineering Argonne National Laboratory LemontIL United States Department of Electrical Computer and Energy Engineering Materials Science and Engineering Program University of Colorado Boulder CO United States Renewable and Sustainable Energy Institute National Renewable Energy Laboratory University of Colorado Boulder CO United States

Emulsions comprising isotropic fluid drops within a nematic host are of interest for applications ranging from biodetection to smart windows, which rely on changes of molecular alignment structures around the drops in response to chemical, thermal, electric and other stimuli. We show that absorption or desorption of trace amounts of common surfactants can drive continuous transformations of elastic multipoles induced by the droplets within the uniformly aligned nematic host. Out-of-equilibrium dynamics of director structures emerge from a controlled self-assembly or desorption of different surfactants at the drop-nematic interfaces, with ensuing forward and reverse transformations between elastic dipoles, quadrupoles, octupoles and hexadecapoles. We characterize inter-transformations of droplet-induced surface and bulk defects, probe elastic pair interactions and discuss emergent prospects for fundamental science and applications of the reconfigurable nematic emulsions. © 2022, CC BY-NC-ND.

关键词： Surface active agents

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Molecular beam homoepitaxy of N-polar AlN: Enabling role of Al-assisted surface cleaning

arXiv

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arXiv 2022年

作者： Zhang, Zexuan Hayashi, Yusuke Tohei, Tetsuya Sakai, Akira Protasenko, Vladimir Singhal, Jashan Miyake, Hideto Xing, Huili Grace Jena, Debdeep Cho, YongJin School of Electrical and Computer Engineering Cornell University IthacaNY14853 United States Graduate School of Engineering Science Osaka University 1-3 Machikaneyama-cho Osaka Toyonaka560-8531 Japan Graduate School of Engineering Mie University 1577 Kurimamachiya-cho Mie Tsu514-8507 Japan Graduate School of Regional Innovation Studies Mie University 1577 Kurimamachiya-cho Mie Tsu514-8507 Japan Department of Materials Science and Engineering Cornell University IthacaNY14853 United States Kavli Institute Cornell for Nanoscale Science IthacaNY14853 United States

N-polar aluminum nitride (AlN) is an important building block for next-generation high-power RF electronics. We report successful homoepitaxial growth of N-polar AlN by molecular beam epitaxy (MBE) on large-area cost-effective N-polar AlN templates. Direct growth without any in-situ surface cleaning leads to films with inverted Al-polarity. It is found that Al-assisted cleaning before growth enables the epitaxial film to maintain N-polarity. The grown N-polar AlN epilayer with its smooth, pit-free surface duplicates the structural quality of the substrate as evidenced by a clean and smooth growth interface with no noticeable extended defects generation. Near band-edge photoluminescence peaks are observed at room temperature on samples with MBE-grown layers but not on the bare AlN substrates, implying the suppression of non-radiative recombination centers in the epitaxial N-polar AlN. These results are pivotal steps towards future high-power RF electronics and deep ultraviolet photonics based on the N-polar AlN platform. Copyright © 2022, The Authors. All rights reserved.

关键词： Aluminum nitride

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Mechanical properties of ZrW2O8 filled polymers

Mechanical properties of ZrW2O8 filled polymers

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47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and materials Conference

作者： Kroetch, Chris A. Weyer, Wayne C. Cross, William M. Henderson, Brooks D. Kellar, Jon J. Kjerengtroen, Lidvin Welsh, Jeffry Starkovich, John South Dakota School of Mines and Technology Rapid City SD 57701 United States Air Force Research Laboratory Space Vehicles Directorate Kirtland AFB NM 87117 United States Northrop-Grumman Space Technologies Redondo Beach CA 90278 United States Department of Mechanical Engineering 501 E. St. Joseph St. United States Materials Engineering and Science Program 501 E. St. Joseph St. United States Department of Materials and Metallurgical Engineering 501 E. St. Joseph St. United States Integrated Structural Systems SE Bldg. 472 3550 Aberdeen Ave. United States NGST Structures and Mechanisms Product Center Mail Stop R4-2112 One Space Park

No abstract available

ISBN: (纸本)1563478080

No abstract available

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Exploring the synthesis conditions to control the morphology of gold-iron oxide heterostructures

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Nano Research 2019年第8期12卷 1781-1788页

作者： Pablo Tancredi Luelc Souza da Costa Sebastian Calderon Oscar Moscoso-Londono Leandro M. Socolovsky Paulo J. Ferreira Diego Muraca Daniela Zanchet Marcelo Knobel Laboratory of Amorphous Solids INTECINFaculty of EngineeringUniversity of Buenos Aires - CONICETBuenos AiresCP C1063ACVArgentina Department of Inorganic Chemistry Institute of ChemistryUniversity of Campinas (UNICAMP)CP615413083-970CampinasSPBrazil Brazilian Nanotechnology National Laboratory (LNNano) Rua Giuseppe Maximo Scolfaro 10000CampinasSPBrazil International Iberian Nanotechnology Laboratory (INL) Av. Mestre Jose Veiga s/n4715-330 BragaPortugal “Gleb Wataghin” Institute of Physics University of Campinas (UNICAMP)CEP 13083-859CampinasSPBrazil Autonomous University of Manizales Antigua Estacion del FerrocarrilManizalesCP 170001Colombia Facultad Regional Santa Cruz Universidad Tecnoldgica Nacional - CIT Santa Cruz (CONICET)- Av delos Inmigrantes 555Rio GallegosSanta CruzArgentina Materials Science and Engineering Program The University of Texas at AustinAustinTexas 78712USA

Gold-iron oxide nano-heterostructures with a clear and well-defined morphology were prepared via a seed-assisted method. The synthesis process and the events of heterogeneous nucleation during the decomposition of the iron precursor were carefully studied in order to understand the mechanism of the reaction and to tailor the architecture of the fabricated heterostructures. When employing Au seeds of 3 and 5 nm, nanoparticles with a dimer-like morphology were produced due to the occurrence of a single iron oxide nucleation event. Otherwise, multi-nucleation events could be favored by two mechanisms:(i) by the incorporation of a reducing agent and the slowing down of the heating protocol, leading to a core-shell system;(ii) by the increase of the Au seed size to 8 nm, leading to a flower-like system. Further increase of the Au seed size to 12 nm using similar synthesis conditions promotes the homogeneous nucleation and growth of the iron oxide phase, without formation of heterostructures. An in-depth study was performed on the gold-iron oxide heterostructures to confirm the epitaxial growth of the oxide domain over the Au seed and to analyze the elemental distribution of the components within the heterostructures. Finally, it was found that the modification of the plasmonic properties of the Au nanoparticles are strongly influenced by the architecture of the heterostructure, with a more pronounced damping effect for the systems produced after multi-nucleation events.

关键词： nanoparticles gold-iron oxide heterostructures heterogeneous nucleation epitaxial growth HR-microscopy

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