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2008 AIChE Annual Meeting, AIChE 100

作者： Erkey, Can Cangul, Betul Yasar, Nazire Seda Department of Chemical and Biological Engineering Koc University 34450 Sariyer Istanbul Turkey Material Science and Engineering Program Koc University 34450 Sariyer Istanbul Turkey

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Novel porous nano-graphene/polyimide composite as electrode material 73

Novel porous nano-graphene/polyimide composite as electrode ...

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73rd Annual Technical Conference and Exhibition of the Society of Plastics Engineers, SPE ANTEC Orlando 2015

作者： Okafor, Patricia Azuka Iroh, Jude Material Science and Engineering Program School of Energy Environmental Medical and Biomedical Engineering University of Cincinnati 2600 Clifton Avenue CincinnatiOH45221 United States

ISBN: (纸本)9780985011277

In this work, we have studied the electrochemical behavior of non-porous and porous graphene/polyimide composite films fabricated by the thermal degradation of grafted flexible acrylic acid on polyamic acid backbone. It is observed that pore size distribution has a significant effect on specific capacitance and bulk resistance of the composite material. BET and Electrochemical impedance spectroscopy (EIS) data reveal a complex pore distribution for the materials. As the porosity of the composite material increased, its bulk resistance decreased by up to 400% and the specific capacitance increased by up to 200%. Ionic diffusion resistance associated with the pore structure for the porous composite decreased due to easy access of electrolyte ions through the pore length of the material. Specific capacitance of up to 34,240mF/g was obtained for the composite system at a scan rate of 50mV/s which remained fairly stable through the 50 cycle runs. Potassium hexaflorophosphate (KPF6) dissolved in propylene carbonate was used as electrolyte for all the electrochemical techniques.

关键词： Graphene

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Thermal modeling of very small scale devices

Thermal modeling of very small scale devices

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2004 ASME International Mechanical engineering Congress and Exposition, IMECE 2004

作者： Bulusu, A. Walker, D.G. Interdisciplinary Program in Material Science Vanderbilt University Nashville TN 37235 Department of Mechanical Engineering Vanderbilt University Nashville TN 37235

As electronic device dimensions shrink down to the nanoscale regime, quantum effects such as electron tunneling and quantum confinement become significant. Along with quantum effects, various scattering processes such as carrier-carrier and carrier-defect scattering will influence device performance. Many transport models are not mature enough to couple the thermal effects with electronic solutions at such small scales. Incorporation of strong scattering influences on the electron transport in most cases is extremely difficult and computationally intensive. In this paper, we study a simple model that allows for integration of electron-phonon scattering effects in a nanotransistor. An acoustic deformation potential based electron-phonon scattering model is used to incorporate scattering in the device. A 7.5% drop in channel current was observed for a scattering rate of 1013/sec while current flow dropped by 50% for higher scattering rates. The effective channel resistance due to scattering was found to increase by a factor of 1.3. The results are compared to the I-V characteristics obtained using the non-equilibrium Green's function (NEGF) formalism and were found to match well. The effect of phase-breaking scattering was also studied using NEGF where a 25% decrease in channel current was obtained thus demonstrating the importance of including scattering effects with quantum transport. Copyright © 2004 by ASME.

关键词： Electronic equipment

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Super-Resolution Displacement Spectroscopic Sensing over a Surface“Rainbow”

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engineering 2022年第10期17卷 75-81页

作者： Lyu Zhou Nan Zhang Chang Chieh Hsu Matthew Singer Xie Zeng Yizheng Li Haomin Song Josep Jornet Yun Wu Qiaoqiang Gan Department of Electrical Engineering The State University of New York at BuffaloBuffaloNY 14260USA Department of Biomedical Engineering The State University of New York at BuffaloBuffaloNY 14260USA Department of Electrical and Computer Engineering Northeastern UniversityBostonMA 02115USA Material Science Engineering Program King Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia

Subwavelength manipulation of light waves with high precision can enable new and exciting applications in spectroscopy,sensing,and medical *** these applications,miniaturized spectrometers are desirable to enable the on-chip analysis of spectral *** particular,for imaging-based spectroscopic sensing mechanisms,the key challenge is to determine the spatial-shift information accurately(i.e.,the spatial displacement introduced by wavelength shift or biological or chemical surface binding),which is similar to the challenge presented by super-resolution ***,we report a unique"rainbow"trapping metasurface for on-chip spectrometers and *** with super-resolution image processing,the low-setting 4×optical microscope system resolves a displacement of the resonant position within 35 nm on the plasmonic rainbow trapping metasurface with a tiny area as small as0.002 *** unique feature of the spatial manipulation of efficiently coupled rainbow plasmonic resonances reveals a new platform for miniaturized on-chip spectroscopic analysis with a spectral resolution of 0.032 nm in wavelength *** this low-setting 4×microscope imaging system,we demonstrate a biosensing resolution of 1.92×109exosomes per milliliter for A549-derived exosomes and distinguish between patient samples and healthy controls using exosomal epidermal growth factor receptor(EGFR)expression values,thereby demonstrating a new on-chip sensing system for personalized accurate bio/chemical sensing applications.

关键词： Rainbow trapping Metasurface Surface plasmon polaritons Super-resolution displacement On-chip biosensing

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Porous graphene-polyimide nanocomposites for energy storage

Porous graphene-polyimide nanocomposites for energy storage

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SAMPE Baltimore 2015 Conference and Exhibition

ISBN: (纸本)9781934551196

关键词： Composite films

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Compact solar-powered plasma water generator: enhanced germination of aged seed with the corona dielectric barrierdischarger

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Frontiers of Agricultural science and engineering 2024年第4期11卷 642-651页

作者： Yiting XIAO Yang TIAN Haizheng XIONG Ainong SHI Jun ZHU Biological Engineering University of ArkansasFayettevilleAR 72701USA Program of Material Science and Engineering University of ArkansasFayettevilleAR 72701USA Department of Horticulture University of ArkansasFayettevilleAR 72701USA.

Seed aging adversely affects agricultural productivity by reducing germination rates and seedling vigor,leading to significant costs for seed banks and companies due to the need for frequent seed *** study demonstrated the use of plasma-activated water(PAW),generated by a solar-powered corona dielectric barrier discharger,to enhance germination rates of spinach seeds that had been stored at 4℃ for 23 *** seeds with PAW at 17 kV for 15 min improved germination(by 135%)and seedling growth compared to untreated *** detailed analysis,beneficial PAW properties for seed development were identified,and a molecular mechanism for this rejuvenation is *** solar-powered microreactor used in this study is considered to represent a significant advancement in seed treatment technology,offering a sustainable solution to meet growing food demands while addressing environmental and resource sustainability challenges.

关键词： Non-thermal plasma plant growth reactor design seedgermination

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Comparative analysis of the surface functionalization and texturization of HDPE after H2 and O2 ion plasma immersion

Comparative analysis of the surface functionalization and te...

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2012 International Conference on Environmental and materials engineering, EME 2012

作者： Camacho, Melissa Angelica C. Ramos, Henry J. Material Science and Engineering Program College of Science University of Philippines Diliman Quezon City Philippines National Institute of Physics College of Science University of Philippines Diliman Quezon City Philippines

ISBN: (纸本)9783037856017

An in-house constructed Plasma Enhanced Chemical Vapor Deposition (PECVD) facility was used in this study to facilitate the surface chemistry improvement on High Density Polyethylene (HDPE) sheets and allow an increase in adhesion of copper thin films on HDPE sheets. The material's wet ability and polymer-metal adhesive strength are compared before and after plasma treatment to understand the creation and rearrangement of the functional groups present on the surface of H2 and O2 ion irradiated HDPE sheets. Results showed the detection of O-H, C≡C, C{box drawings double horizontal}C and C-O bonds on the surface of the irradiated samples. H2 ion irradiated sheets, however, showed no surface chemical functionality changes. © (2013) Trans Tech Publications, Switzerland.

关键词： Surface treatment

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Development of a novel quality control indicator for coffee roasting based on the digitalization of smell by a portable electronic nose 20

Development of a novel quality control indicator for coffee ...

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20th International Joint Conference on Computer science and Software engineering, JCSSE 2023

作者： Somaudon, Varanya Sakuldee, Pathapee Kerdcharoen, Teerakiat Materials Science and Engineering Program Mahidol University Faculty of Science Bangkok Thailand School of Science Material Engineering Mae Fah Luang University Chiang rai Thailand Mahidol University Faculty of Science Department of Physics Bangkok Thailand

ISBN: (纸本)9798350300505

Northern Thailand is home to several Arabica coffee-growing regions, including Mae-kampong, Teentok, Mae-lord, and Monngo Valleys, whose coffees are featured throughout this study. These coffees have distinct aromas and flavors due to their varied cultivation locations, which are influenced by unique climatic conditions. The purpose of this paper is to comprehend the aroma of coffees brought from various locations and roasted under the same conditions. Our lab-made electronic nose (e-nose) was used to digitalize and analyze the smell of coffee. In order to monitor the coffee scent throughout roasting and assess how similar the aromas of coffee samples taken from various locations are to one another, principal component analysis and hierarchical cluster analysis were used. It was found that our e-nose system is an effective tool for determining the geo-location of the coffee origin as well as for quality control of coffee production. © 2023 IEEE.

关键词： Electronic nose

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Probabilistic based design for FRP strengthening of reinforced concrete 7

Probabilistic based design for FRP strengthening of reinforc...

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7th International Symposium on Fiber- Reinforced Polymer Reinforcement for Reinforced Concrete Structures, FRPRCS 2005

作者： Atadero, Rebecca A. Karbhari, Vistasp M. The Department of Structural Engineering The University of California San Diego United States The Department of Structural Engineering The Material Science Program The University of California San Diego United States

ISBN: (纸本)9780870311895

This paper presents an approach for considering a wide variety of composite materials in reliability-based design of composite strengthening of concrete structures. The approach is based on the use of the mean value of composite properties as the design value and having a composite specific resistance factor that is a function of the COV of the composite properties. Strengthening design of a simple beam with three model composites is used to demonstrate the feasibility of this approach. For comparison, designs are created using two existing strengthening guidelines, ACI 440 and TR55. These designs are shown to have a high degree of variability in their reliability and demonstrate the need for a reliability based design procedure. Some of the critical areas of further research required for further development of this design procedure are briefly discussed. © 2005 American Concrete Institute. All rights reserved.

关键词： Design

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High resolution and high sensitivity imaging magnetometer with magnetic nanoparticle and optical heterodyne detection

High resolution and high sensitivity imaging magnetometer wi...

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2024 Frontiers in Optics, FiO 2024

作者： Bartos, Jan Tis, Taleb Ba Park, Wounjhang Huang, Shu-Wei Department of Electrical Computer and Energy Engineering University of Colorado Boulder80309 United States Material Science and Engineering Program University of Colorado Boulder80309 United States

We present progress towards an imaging magnetometer using a magneto-optical polymer nanocomposite thin film, experimentally demonstrating 29nT/√Hz sensitivity with © Optica Publishing Group 2024, © 2024 The... 详细信息

关键词： Heterodyne detection

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