Results 41 to 50 of about 37,606 (171)

Determination of ppb level anions in sulfolane by ion chromatography with a novel column-switching injection system(离子色谱-柱切换进样抑制电导检测环丁砜中的杂质阴离子)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2008
研究了采用离子色谱法-柱切换进样抑制电导检测环丁砜样品中的阴离子的分析方法.采用美国Dionex公司ICS90型离子色谱仪,用9 mmol• L-1 Na2CO3淋洗.一根短柱连接在定量环中作浓缩柱,进样时,首先使低浓度的环丁砜中阴离子富集在浓缩柱中,大部分对柱子可能有损害的有机物被除去,然后再切换到分析柱中进行分离检测,可成功地测定环丁砜中的Cl-、NO3-、SO42-等痕量阴离子 ...
CHENMei-lan(陈梅兰)   +3 more
doaj   +1 more source

Research on Synthesis, Self-Assembly Behavior and pH Responsive Property of A Novel Hybrid POSS-based Copolymer with Zwitterion [PDF]

open access: yes, 2016
摘要 POSS是一种纳米级分子内杂化结构,具有强度高、模量大、耐磨性好、抗氧化性强、生物相容性优异的特点,是一类应用广泛的材料;两性离子是一类存在于自然界生物体中的物质,分子链同时带相等数目正负电荷,这种特殊结构赋予其良好的生物相容性、抗非特异蛋白吸附能力、反聚电解质性、pH敏感性等,是近年来的研究热点。目前基于两性离子共聚物的研究中,与两性离子单体共聚的单体种类少、聚合物结构较为单一,且研究缺少对两性离子结构在体系自组装、环境响应性及作为药物控释载体对药物的包载及释放方面所起作用的探索 ...
曹莹
core  

Engineering Geometric Active Sites in Cobalt Spinel Oxides for Energy and Environmental Catalysis

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Cobalt‐based spinel oxides (Co3O4 and derivatives) are among the most promising transition metal oxides for electrochemical energy conversion and environmental catalysis due to their abundant active sites, structural tunability, and robust redox flexibility.
Shenning Liu   +6 more
wiley   +1 more source

牙齿中氟、磷和钙的测定

open access: yesZhongshan Daxue xuebao. Yixue kexue ban, 1981
一般认为氟化物的防龋机理之一,是由于氟离子与牙釉质表面的羟基磷灰石Ca5(PO4)3OH中的羟基发生交换反应: 由于氟离子与氢氧离子电荷相等,离子半径也非常接近,极易发生交换反应。生成氟磷灰石Ca5(PO4)3F有较强的耐酸性,故有防龋作用。如忽略磷、钙、羟基和氟离子以外的其他离子的作用,则氟-羟基磷灰石的组成为:
黎兰馨
doaj  

Adsorption of CO2 by ionic liquids grafted on mesoporous MCM-41 [PDF]

open access: yes, 2016
为了提高离子液体(ILs)对二氧化碳的吸收能力,也为改善多孔材料对二氧化碳的选择性,将离子液体嫁接到多孔材料形成优良吸附剂是针对二氧化硅捕获的一个热点研究方向。本工作研究两种新的吸附材料,也就是把苄乙基三甲基氯化铵([VBTMA][Cl])和四庚基溴化铵([thepAm][Br])两种离子液体MCM-41材料,并研究所制备的吸附材料对CO2、H2、CO的吸附量以及对CO2的吸附选择性。 通过对MCM-41三种方法的预处理,以及表面嫁接MPMTS,FT-IR、TGA、BET、TEM和元素分析等表征结果表明,
NKINAHAMIRA FRANCOIS
core  

A Multifunctional MXene/CNF/PVB Fabric via Layer‐by‐Layer Construction for Electromagnetic Interference Shielding, Joule Heating, and Infrared Stealth

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT The rapid advancement of 5G communication technology has intensified electromagnetic pollution, creating an urgent demand for flexible multifunctional fabrics with efficient electromagnetic interference (EMI) shielding performance. This study proposes a novel material‐stacked construction strategy to fabricate multifunctional MXene/cellulose ...
Zong‐Kai Yan   +9 more
wiley   +1 more source

强迫风冷大电流封闭母线中离子密度的测试

open access: yesGaoya dianqi, 1995
设计了强迫风冷封闭母线模型段、电晕离子源以及平板式和圆筒式两种离子计数器。在不同电晕电压下,施加不同偏压,用两种计数器测量了距离子源不同距离处的离子密度,并分析了测试结果。
王尔智   +4 more
doaj  

Study of Lithium Excess Cathode Materials xLi3NbO4·(1-x)LiMO2(M=Mn, Ni, Co; 0 [PDF]

open access: yes, 2016
锂离子电池是当前最具有发展潜力的动力与储能电池体系,衡量锂离子电池性能的一个重要指标是电池的能量密度。为了实现更高的电池能量密度,我们需要采取提高电池材料的比容量,或提高电池平均放电电压的途径来实现这一目标。由于目前锂离子电池负极材料如石墨材料理论比容量一般都比较高,因此如何实现锂离子电池正极材料的高比容量及其高工作电压成为了当前锂离子电池研究的重要课题。由于富锂锰基正极材料在充电到高电压下可以可逆脱嵌较多的锂离子,具有较大的比容量,因此,富锂材料成为了目前正极材料研究的一个重要课题 ...
杨春
core  

Calcium-binding capacity of organic and inorganic ortho- and polyphosphates [PDF]

open access: yes
The aim of this research was to determine the calcium-binding capacity of inorganic and organic ortho- and polyphosphates. This calcium-binding capacity can be used to influence the stability of, for example, casein micelles in dairy systems.
Hooijdonk, A.C.M., van   +4 more
core   +2 more sources

Electrospinning‐Driven IGZO Nanofiber Phototransistors Bridging Adaptive Processing and Recognition Learning

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT The development of neuromorphic electronics with visual perception and adaptive capability is highly desirable for advancing artificial vision systems. Herein, we have demonstrated a dual‐plasticity adaptive phototransistor based on IGZO nanofibers that exhibits the perception and dynamic adaptation behavior of rod and cone cells to varying ...
Shanshan Jiang   +5 more
wiley   +1 more source

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