Khu vực nhận download các paper trên Sciencedirect, ACS, IOP và một số paper khác

Cám ơn anh nhiều .
Anh kiếm giùm em tài liệu nào nói về phương pháp The modified Staudenmaier method, để tạo graphite oxide, nếu đc cám ơn anh vạn lần luôn.

Minh ko co nhieu tg di vao chi tiet. Mot so bai minh down duoc

http://www.mediafire.com/?o93qdwyoihssbis

Nguon tham khao cac bai nay`:

http://www.nature.com/nnano/journal/v4/n4/fig_tab/nnano.2009.58_T1.html

Chuc ban thanh cong... khi nao thanh cong send minh 1 it' graphene nha.

Sax, tu nhien dang ngoi suy nghi~... nho ra 1 chuyen... xitrum dung cam on nha... cam on 1 lan len 1 point... gianh mat vi tri top cua tui...

Bai cua ban
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Maddragon đã viết:

Sax, tu nhien dang ngoi suy nghi~... nho ra 1 chuyen... xitrum dung cam on nha... cam on 1 lan len 1 point... gianh mat vi tri top cua tui...

Suốt ngày chỉ biết Top.. giờ cố phấn đấu lên giành ghế Admin đi..

Luc sang co ai do' up len xin bai gi`... em vua up len... tu nhien mat tieu cai yeu cau`... lam` nhu em bi dien... up link bua` bai~... xin them 1 point... ^_^

Down giùm em bài này với .

Preparation of Graphitic Oxide

Author : William S. Hummers Jr., Richard E. Offeman

Trong link này nè : http://pubs.acs.org/doi/abs/10.1021/ja01539a017?journalCode=jacsat&quickLinkVolume=80&quickLinkPage=1339&volume=80

Thanks.

http://www.mediafire.com/?15bzc32oha39j59

bài của bạn đây

Các bạn down giúp mình cái này với, mình đang cần lắm...
Tên tác giả: Kreymer,G. S.
Page: 166
Năm xuất bản: 25 MAR 1974
Title: Strength of Hard Alloys
Abtract: Strength and mechanical properties of two- and three-phase WC-TiC-Co and WC-TiC-TaC-Co alloys are discussed in relation to temperature, alloy composition, and alloy structure. The mechanism of breakdown under bending and compression and the effects of alloy structure on this process are described. Partial replacement of titanium carbide by tantalum carbide in three-phase WC-TiC-Co alloys tends to have a favorable effect on mechanical properties such as fatigue strength under bending and impact durability.
Email: phanvuckm@gmail.com
Cảm ơn các bạn nhiều!

Em là sv bộ môn chất rắn khóa 08 , anh down giùm em bài này với .

Evaluation of Solution-Processed Reduced Graphene Oxide Films as Transparent Conduct

Link: http://pubs.acs.org/doi/abs/10.1021/nn700375n

Improved Synthesis of Graphene Oxide

Link: http://pubs.acs.org/doi/abs/10.1021/nn1006368

vlcr08
http://www.mediafire.com/?xkqdnxrjl6lnu5h
Trung thu vui ve.

Phan.thanhvu oi: ban co the cho minh xin link duoc ko a.

Có 3 link, mình đưa ra hết đây. Bạn cố gắng giúp mình với nha.
http://cdsweb.cern.ch/record/452791
http://openlibrary.org/works/OL10480272W/Strength_of_hard_alloys
http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=ADA002635

Down giùm em bài này với :

Platinum/Graphene Nanosheet/SiC Contacts and Their Application for Hydrogen Gas Sensing

abtract :
Pt/graphene nanosheet/SiC based devices are fabricated and characterized and their performances toward hydrogen gas are investigated. The graphene nanosheets are synthesized via the reduction of spray-coated graphite oxide deposited onto SiC substrates. Raman and X-ray photoelectron spectroscopies indicate incomplete reduction of the graphite oxide, resulting in partially oxidized graphene nanosheet layers of less than 10 nm thickness. The effects of interfaces on the nonlinear behavior of the Pt/graphene and graphene/SiC junctions are investigated. Current−voltage measurements of the sensors toward 1% hydrogen in synthetic air gas mixture at various temperatures ranging up to 100 °C are performed. From the dynamic response, a voltage shift of 100 mV is recorded for 1% hydrogen at a constant current bias of 1 mA at 100 °C.

Web :
http://pubs.acs.org/doi/abs/10.1021/jp104459s

Have a nice weekend! ^_^
Xitrum:
http://www.mediafire.com/?gkovkfw2as4tc6h

Con sach' phia tren minh ko down duoc, sr nha.

Down giùm em bài này với :

Carbon dioxide gas sensor using a graphene sheet

Tác giả :
Hyeun Joong Yoona, Do Han Junb, Jin Ho Yanga, Zhixian Zhouc, Sang Sik Yangb, , , Mark Ming-Cheng Cheng

Abstract :
In this article, we report on a high-performance graphene carbon dioxide (CO2) gas sensor fabricated by mechanical cleavage. Unlike other solid-state gas sensors, the graphene sensor can be operated under ambient conditions and at room temperature. Changes in the device conductance are measured for various concentrations of CO2 gas adsorbed on the surface of graphene. The conductance of the graphene gas sensor increases linearly when the concentration of CO2 gas is increased from 10 to 100 ppm. The advantages of this sensor are high sensitivity, fast response time, short recovery time, and low power consumption

Link của nó nè :
http://www.sciencedirect.com/science/article/pii/S0925400511002310

Thanks.

Bài ở trên down ko dc hả mấy anh ?

Di du lich het goy...

http://www.mediafire.com/?bggm5d3yvrzuhf2

Chào các bạn!

Mình đang cần tài liệu này để đối chiếu, bạn nào load dùm với

http://iopscience.iop.org/0025-5726/11/2/A01

Cảm ơn các bạn rất nhiều vì đã nhờ vài lần và đều được nhiệt tình giúp đỡ, nếu cần mình đóng góp công sức gì cho 4r thì mình rất sẵn lòng tham gia. Nhưng mà mình học toán nên k biết có giúp được gì k.

Hú hồn, nhìn thấy 4r tưởng bạn cho mình 4 triệu 1 tháng

Bài bạn đây:
http://www.mediafire.com/?d0t3w4zlnl1q8q4

Về toán học thì có nhiều điều mình cần lắm, mấy hôm upload đâu có ai trả lời.
Hôm nào mình kẹt mình sẽ pm...
Lâu rồi diễn đàn không ai vô, làm mình chán rồi đó, tinh thần học tập có vẻ sa sút.

Chơi game thôi ^_^

Mấy anh ơi down giùm em mấy bài này với . Mấy bữa trước ko biết gửi ngoài, ko ai để ý, giờ biết rồi. :

Bài 1 :
Tựa đề : Microwave exfoliation of a graphite intercalation compound
Abstract : ko thấy để .

Link : http://www.mendeley.com/research/microwave-exfoliation-graphite-intercalation-compound-1/#

Bài 2 :
Tựa đề : Tunable Electrical Conductivity of Individual Graphene Oxide Sheets Reduced at “Low” Temperatures

Abstract : Step-by-step controllable thermal reduction of individual graphene oxide sheets, incorporated into multiterminal field effect devices, was carried out at low temperatures (125−240 °C) with simultaneous electrical measurements. Symmetric hysteresis-free ambipolar (electron- and hole-type) gate dependences were observed as soon as the first measurable resistance was reached. The conductivity of each of the fabricated devices depended on the level of reduction (was increased more than 106 times as reduction progressed), strength of the external electrical field, density of the transport current, and temperature.

Link : http://pubs.acs.org/doi/abs/10.1021/nl8019938?journalCode=nalefd&quickLinkVolume=8&quickLinkPage=4283&volume=8

Bài 3 :

Tựa đề : Chemical analysis of graphene oxide films after heat and chemical treatments by X-ray photoelectron and Micro-Raman spectroscopy

Abstract : Several nanometer-thick graphene oxide films deposited on silicon nitride-on silicon substrates were exposed to nine different heat treatments (three in Argon, three in Argon and Hydrogen, and three in ultra-high vacuum), and also a film was held at 70 °C while being exposed to a vapor from hydrazine monohydrate. The films were characterized with atomic force microscopy to obtain local thickness and variation in thickness over extended regions. X-ray photoelectron spectroscopy was used to measure significant reduction of the oxygen content of the films; heating in ultra-high vacuum was particularly effective. The overtone region of the Raman spectrum was used, for the first time, to provide a “fingerprint” of changing oxygen content.

Link : http://www.sciencedirect.com/science/article/pii/S0008622308005022

Thanks and best regards.

Nho cac ban download giup minh bai nay, minh cam on rat nhieu!

http://nitrodownloads.net/signup/collected-papers-i-1952-1970.rar

Xintrumxi'xon:

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Link cua ltphc ... minh nhin co ve nguy hiem, ko dam click vao ^_^ ... sr nghen...

Nhờ anh download giùm em bài này

Bài 1 :
Chủ đề " Luminescent colloidal silicon particles "
Tác giả : Anton Fojtik, Arnim Henglein

Abstract
Crystalline silicon particles, which are coated by an oxide layer, are prepared by combustion of silane. Red or orange luminescence is activated by etching them in a 1:1 cyclohexane—propanol-2 suspension by aqueous hydrogen fluoride in the presence of air. The temporal changes in the luminescence intensity of the suspension (several days) are described. When a suspension of luminescent particles in cyclohexane is mixed with polar solvents such as alcohol, ether and chloroform, a more or less quenching of the luminescence (depending on the nature of the added solvent) occurs. Mixing with non-polar solvent such as carbon tetrachloride does not lead to quenching. Triethylamine and ammonia quench the luminescence extremely effectively. Sulfuric acid also quenches. The particles migrate in an electric field in different directions depending on the chemical surface treatment. It is concluded that luminescence occurs when the particles carry only a few oxidized centers on the surface, and the protonation state of these centers strongly affects the luminescence.

Link : http://www.sciencedirect.com/science/article/pii/0009261494002711

Bài 2 :

Chủ đề : Synthesis and Characterization of Germanium/Si−Alkyl and Germanium/Silica Core−Shell Quantum Dots
Tác giả : Chung-Sung Yang and Susan M. Kauzlarich

Abstract
Ge/Si−R and Ge/SiO2 core−shell nanoparticles have been synthesized by a solution route from the stepwise reactions of the Zintl salt, Mg2Ge, with SiCl4 and subsequently either RLi (R = butyl) or H2O2. High-resolution transmission electron microscopy (HRTEM) images show that the core part of these Ge/Si−R and Ge/SiO2 nanoparticles is crystalline and the d spacing of lattice fringes agrees with the {111} crystal plane (3.27 Å) of Ge. The average sizes (diameter) are 5.8(2.3) and 6.8(2. nm for Ge/Si−R and Ge/SiO2, respectively. Fourier transform−infrared (FTIR) spectra are consistent with alkyl groups bonded to the silicon surface in Ge/Si−R nanoclusters. Off-axis holography was performed for several Ge/SiO2 nanoparticles. The characterization of the ratio of radii and geometry between the core part and the outer sphere of Ge/SiO2 is presented. The reconstructed phase image from the hologram offers detailed information concerning the ratio of the shell thickness (R − r) to the radius of the core (r), Rr = (R − r)/r, by measuring the phase shift and the resultant phase contrast. The Rr value from the deconvoluted phase image of a 16 nm spherelike Ge/SiO2 is 0.264 (0.065). Photoluminescence (PL) spectra of both Ge/Si−R and Ge/SiO2 nanoclusters show a strong UV−blue PL with a peak centered between 400 and 410 nm. These results suggest that the UV−blue PL may be attributed to the core part of these nanoparticles.

Link: http://pubs.acs.org/doi/abs/10.1021/cm9905949

Bài 3 :
Chủ đề : Characterization of Silicon Nanoparticles Prepared from Porous Silicon
Tác giả : Richard A. Bley,† Susan M. Kauzlarich,*† Jeffrey E. Davis,‡§ and Howard W. H. Lee‡

Abstract
Nanometer-sized silicon particles have been produced by ultrasonic dispersion of thin sections of porous silicon (PS) in organic solvents. The particles have been characterized by HRTEM (high-resolution transmission electron microscopy), FTIR (Fourier transform infrared) spectroscopy, and fluorescence spectroscopy. HRTEM shows both aggregates of and monodispersed crystallite particles of Si. The larger aggregates range in size from 20 to 50 nm and are made up of small crystallites with diameters of 2−10 nm. Monodispersed crystallites ranged in size from 2−10 nm. All the particles have an amorphous layer of SiO2. The photoluminescence (PL) spectrum shows two peaks:  a red peak at around 680 nm, which is typical for PS and a blue peak between 415 and 446 nm, which is not typical for as-prepared PS. As a function of increased excitation intensity, the blue peak grows at the expense of the red. This is discussed in light of photoluminescence lifetime data. The red luminescence is attributed to quantum confinement. The blue luminescence is attributed to either extremely small Si crystallites or (Si(II))0 defects embedded in the oxide matrix.

Link: http://pubs.acs.org/doi/abs/10.1021/cm950608k

Em cám ơn anh