期刊,Journal of Materials Chemistry 2012年22卷48期_国家学术搜索

Here's to the future

Liz dunnSeth Marder

2页

查看更多>>摘要：So, here it is, the final issue of Journal of Materials Chemistry in its current form. Whilst we are very excited about the next phase in the journal's life, we would like to take this opportunity to commemorate Journal of Materials Chemistry and look back over some of the highlights of the last 22 years. From issue 1 2013, three new journals will replace Journal of Materials Chemistry (Fig. 1). These will each focus on an area of the field as follows: - Journal of Materials Chemistry A Materials for energy and sustainability - Journal of Materials Chemistry B Materials for biology and medicine - Journal of Materials Chemistry C Materials for optical and electronic devices Each of these three new journals will have the same high standards associated with their parent journal and you can read the Editorials in the first issues of these journals for more information.

原文链接:

NSTL
Royal Soc Chemistry

Here's to the future

Liz dunnSeth Marder

2页

查看更多>>摘要：So, here it is, the final issue of Journal of Materials Chemistry in its current form. Whilst we are very excited about the next phase in the journal's life, we would like to take this opportunity to commemorate Journal of Materials Chemistry and look back over some of the highlights of the last 22 years. From issue 1 2013, three new journals will replace Journal of Materials Chemistry (Fig. 1). These will each focus on an area of the field as follows: - Journal of Materials Chemistry A Materials for energy and sustainability - Journal of Materials Chemistry B Materials for biology and medicine - Journal of Materials Chemistry C Materials for optical and electronic devices Each of these three new journals will have the same high standards associated with their parent journal and you can read the Editorials in the first issues of these journals for more information.

原文链接:

NSTL
Royal Soc Chemistry

Nanonet as a scaffold with targeted functionalities

George GrunerYanli Zhao

9页

查看更多>>摘要：A random assembly of nanoscale electrically conducting wires, a so called a nanonet, has a variety of Interesting properties, which has been exploited for multiple applications. These nanowire networks can also be regarded as a "scaffold" onto which molecules and nanoscale objects can be attached for well defined functionalities. This review summarizes the strategies of the attachments onto the scaffold, the investigation of the interface between the scaffold and the functional species together with the applications in the areas of renewable energy, opto-electronics, catalysis and biotechnology. The initial work on this novel materials platform will likely followed up by development efforts so that the fundamental value propositions associated with the scaffold can be fully exploited. Initial work towards this goal is gradually emerging.

原文链接:

NSTL
Royal Soc Chemistry

Nanonet as a scaffold with targeted functionalities

George GrunerYanli Zhao

9页

查看更多>>摘要：A random assembly of nanoscale electrically conducting wires, a so called a nanonet, has a variety of Interesting properties, which has been exploited for multiple applications. These nanowire networks can also be regarded as a "scaffold" onto which molecules and nanoscale objects can be attached for well defined functionalities. This review summarizes the strategies of the attachments onto the scaffold, the investigation of the interface between the scaffold and the functional species together with the applications in the areas of renewable energy, opto-electronics, catalysis and biotechnology. The initial work on this novel materials platform will likely followed up by development efforts so that the fundamental value propositions associated with the scaffold can be fully exploited. Initial work towards this goal is gradually emerging.

原文链接:

NSTL
Royal Soc Chemistry

Methods of graphite exfoliation

Douglas H. AdamsonDaniel ThorpeMinzhen Cai

11页

查看更多>>摘要：For applications of two-dimensional graphene, commercially viable sources are necessary. Exfoliation from bulk, stacked graphite is the most economical way to achieve large quantities of single layer graphene. A number of methods have been developed to achieve exfoliation of graphite, each with advantages and disadvantages. In this review, we describe current exfoliation methods and techniques used to produce single layer materials from graphite precursors.

原文链接:

NSTL
Royal Soc Chemistry

Methods of graphite exfoliation

Douglas H. AdamsonDaniel ThorpeMinzhen Cai

11页

查看更多>>摘要：For applications of two-dimensional graphene, commercially viable sources are necessary. Exfoliation from bulk, stacked graphite is the most economical way to achieve large quantities of single layer graphene. A number of methods have been developed to achieve exfoliation of graphite, each with advantages and disadvantages. In this review, we describe current exfoliation methods and techniques used to produce single layer materials from graphite precursors.

原文链接:

NSTL
Royal Soc Chemistry

Hollow Au@Pd and Au@Pt core-shell nanoparticles as electrocatalysts for ethanol oxidation reactions

Rachid SougratDalaver H. AnjumHyon Min Song

8页

查看更多>>摘要：Hybrid alloys among gold, palladium and platinum become a new category of catalysts primarily due to their enhanced catalytic effects. Enhancement means not only their effectiveness, but also their uniqueness as catalysts for the reactions that individual metals may not catalyze. Here, preparation of hollow Au@Pd and Au@Pt core-shell nanoparticles (NPs) and their use as electrocatalysts are reported. Galvanic displacement with Ag NPs is used to obtain hollow NPs, and higher reduction potential of Au compared to Ag, Pd, and Pt helps to produce hollow Au cores first, followed by Pd or Pt shell growth. Continuous and highly crystalline shell growth was observed in Au@Pd core-shell NPs, but the sporadic and porous-like structure was observed in Au@Pt core-shell NPs. Along with hollow core-shell NPs, hollow porous Pt and hollow Au NPs are also prepared from Ag seed NPs. Twin boundaries which are typically observed in large size (>20 nm) Au NPs were not observed in hollow Au NPs. This absence is believed to be due to the role of the hollows, which significantly reduce the strain energy of edges where the two lattice planes meet. In ethanol oxidation reactions in alkaline medium, hollow Au@Pd core-shell NPs show highest current density in forward scan. Hollow Au@Pt core-shell NPs maintain better catalytic activities than metallic Pt, which is thought to be due to the better crystallinity of Pt shells as well as the alloy effect of Au cores.

原文链接:

NSTL
Royal Soc Chemistry

Chirality transfer from atropisomeric cMral inducers to nematic and smectic liquid crystals - synthesis and characterization of di- and tetra-substituted axially chiral Mnaphthyl derivatives

Munju GohJinwoo ParkYehdong Han

8页

查看更多>>摘要：The chirality transfer of axially chiral binaphthyl derivatives bearing liquid crystal (LC) moieties at the n,n' positions (n = 3, 4, 6) of the binaphthyl rings to nematic (N) and smectic (S) LCs is investigated. Chiral nematic LCs (N~*-LCs) are prepared by adding a small amount of the chiral binaphthyl derivative into host N-LCs composed of cyanobiphenyl mesogen cores. The binaphthyl derivative with phenylcyclohexyl (PCH) type LC moieties at the 4,4' positions of the binaphthyl ring [D-4,4'] exhibits a low helical twisting power (HTP) of 11 μm~(-1). In contrast, those with LC moieties at the 3,3' and 6,6' positions of the binaphthyl rings [D-3,3' and D-6,6'] exhibit high HTPs of 153 μm~(-1) and 154 μm~(-1), respectively. Next, the binaphthyl derivatives are added into two types of S-LCs with phenylbenzoate mesogen cores: 4-(4-methylpentyloxy)phenyl-4-(decyloxy)benzoate [PhB1] and 4-(3-methylpentyloxy) phenyl-4-(decyloxy)benzoate [PhB2]. The mixture of the host LC, PhBl or PhB2 with the chiral dopant, D-3,3' or D-6,6' shows chiral smectic LCs C (Sc*-LCs). The highly twisted S_c~* phases with helical pitches of 1.2-1.4 μm are prepared in PhBl and PhB2 by using the chiral dopant of D-6,6'. It is concluded that D-6,6' has a large helical twisting power and is the most favourable atropisomeric chiral inducer for chirality transfer to both N-LCs and S-LCs.

原文链接:

NSTL
Royal Soc Chemistry

Chirality transfer from atropisomeric cMral inducers to nematic and smectic liquid crystals - synthesis and characterization of di- and tetra-substituted axially chiral Mnaphthyl derivatives

Munju GohJinwoo ParkYehdong Han

8页

查看更多>>摘要：The chirality transfer of axially chiral binaphthyl derivatives bearing liquid crystal (LC) moieties at the n,n' positions (n = 3, 4, 6) of the binaphthyl rings to nematic (N) and smectic (S) LCs is investigated. Chiral nematic LCs (N~*-LCs) are prepared by adding a small amount of the chiral binaphthyl derivative into host N-LCs composed of cyanobiphenyl mesogen cores. The binaphthyl derivative with phenylcyclohexyl (PCH) type LC moieties at the 4,4' positions of the binaphthyl ring [D-4,4'] exhibits a low helical twisting power (HTP) of 11 μm~(-1). In contrast, those with LC moieties at the 3,3' and 6,6' positions of the binaphthyl rings [D-3,3' and D-6,6'] exhibit high HTPs of 153 μm~(-1) and 154 μm~(-1), respectively. Next, the binaphthyl derivatives are added into two types of S-LCs with phenylbenzoate mesogen cores: 4-(4-methylpentyloxy)phenyl-4-(decyloxy)benzoate [PhB1] and 4-(3-methylpentyloxy) phenyl-4-(decyloxy)benzoate [PhB2]. The mixture of the host LC, PhBl or PhB2 with the chiral dopant, D-3,3' or D-6,6' shows chiral smectic LCs C (Sc*-LCs). The highly twisted S_c~* phases with helical pitches of 1.2-1.4 μm are prepared in PhBl and PhB2 by using the chiral dopant of D-6,6'. It is concluded that D-6,6' has a large helical twisting power and is the most favourable atropisomeric chiral inducer for chirality transfer to both N-LCs and S-LCs.

原文链接:

NSTL
Royal Soc Chemistry

Microwave-assisted crystallization inclusion of spiropyran molecules in indium trimesate films with antidromic reversible photochromism

Xiaoqin ZouWei FengFeng Zhang

8页

查看更多>>摘要：An indium trimesate metal-organic framework (JUC-120) which possesses a cubic zeolitic MTN topology, as a new analogue to MIL-100(A1, Fe or Cr) compounds, has been successfully synthesized. Its structure exhibits a mesoporous cage (26 A) and high thermal stability. The assembly of nitrobenzospiropyran derivatives (BSP) into JUC-120 nanocrystals (BSP/JUC-120) is achieved by a microwave-assisted crystallization inclusion approach. The BSP/JUC-120 films have been prepared on quartz wafers by a spin-coating method. The successful encapsulation of BSP molecules into the mesopores of the JUC-120 structure has been verified by N2 adsorption and TGA measurements. The photochromic properties of BSP/JUC-120 films are studied by the UV-Vis and fluorescence spectroscopies. More interestingly, metastable open merocyanine (OMC) species are directly generated from the closed spiropyran form (CSP) without photoirradiation and stabilized for a long period in the BSP/JUC-120 film. The open merocyanine isomer bleaches to the closed spiropyran form by ultraviolet or visible light, and the coloration is regained upon standing in the dark, exhibiting antidromic photochromism. Moreover, the BSP/JUC-120 film shows high reversibility and thermal stability of photochromism. This highly efficient MOF film is expected to be promising in the applications of optical devices.

原文链接:

NSTL
Royal Soc Chemistry