Small
1613-6829
1613-6810
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Cơ quản chủ quản: Wiley-VCH Verlag , WILEY-V C H VERLAG GMBH
Lĩnh vực:
Medicine (miscellaneous)BiomaterialsNanoscience and NanotechnologyChemistry (miscellaneous)Materials Science (miscellaneous)Engineering (miscellaneous)Biotechnology
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Thông tin về tạp chí
Micro and Nano: No Small Matter. Science at the nano- and microscale is currently receiving enormous worldwide interest. Small provides the very best forum for experimental and theoretical studies of fundamental and applied interdisciplinary research at these dimensions. Read an attractive mix of peer-reviewed Communications, Reviews, Concepts, Highlights, Essays, and Full Papers.
Các bài báo tiêu biểu
Pyrrolic‐Type Nitrogen‐Doped Hierarchical Macro/Mesoporous Carbon as a Bifunctional Host for High‐Performance Thick Cathodes for Lithium‐Sulfur Batteries Abstract Lithium‐sulfur (Li‐S) batteries are highly considered as a next‐generation energy storage device due to their high theoretical energy density. For practical viability, reasonable active‐material loading of >4.0 mg cm−2 must be employed, at a cost to the intrinsic instability of sulfur cathodes. The incursion of lithium polysulfides (LiPS) at higher sulfur loadings results in low active material utilization and poor cell cycling capability. The use of high‐surface‐area hierarchical macro/mesoporous inverse opal (IOP) carbons to investigate the effects of pore volume and surface area on the electrochemical stability of high‐loading, high‐thickness cathodes for Li‐S batteries is presented here. The IOP carbons are additionally doped with pyrrolic‐type nitrogen groups (N‐IOP) to act as a polar polysulfide mediator and enhance the active‐material reutilization. With a high sulfur loading of 6.0 mg cm−2 , the Li‐S cells assembled with IOP and N‐IOP carbons are able to attain a high specific capacity of, respectively, 1242 and 1162 mA h g−1 . The N‐IOP enables the Li‐S cells to demonstrate good electrochemical performance over 300 cycles.
Tập 15 Số 16 - 2019
Formation of BNC Coordination to Stabilize the Exposed Active Nitrogen Atoms in g‐C<sub>3</sub>N<sub>4</sub> for Dramatically Enhanced Photocatalytic Ammonia Synthesis Performance Abstract It is an important issue that exposed active nitrogen atoms (e.g., edge or amino N atoms) in graphitic carbon nitride (g‐C3 N4 ) could participate in ammonia (NH3 ) synthesis during the photocatalytic nitrogen reduction reaction (NRR). Herein, the experimental results in this work demonstrate that the exposed active N atoms in g‐C3 N4 nanosheets can indeed be hydrogenated and contribute to NH3 synthesis during the visible‐light photocatalytic NRR. However, these exposed N atoms can be firmly stabilized through forming BNC coordination by means of B‐doping in g‐C3 N4 nanosheets (BCN) with a B‐doping content of 13.8 wt%. Moreover, the formed BNC coordination in g‐C3 N4 not only effectively enhances the visible‐light harvesting and suppresses the recombination of photogenerated carriers in g‐C3 N4 , but also acts as the catalytic active site for N2 adsorption, activation, and hydrogenation. Consequently, the as‐synthesized BCN exhibits high visible‐light‐driven photocatalytic NRR activity, affording an NH3 yield rate of 313.9 µmol g−1 h−1 , nearly 10 times of that for pristine g‐C3 N4 . This work would be helpful for designing and developing high‐efficiency metal‐free NRR catalysts for visible‐light‐driven photocatalytic NH3 synthesis.
Tập 16 Số 13 - 2020
Flexible Cationic Nanoparticles with Photosensitizer Cores for Multifunctional Biomedical Applications Abstract One challenge for multimodal therapy is to develop appropriate multifunctional agents to meet the requirements of potential applications. Photodynamic therapy (PDT) is proven to be an effective way to treat cancers. Diverse polycations, such as ethylenediamine‐functionalized poly(glycidyl methacrylate) (PGED) with plentiful primary amines, secondary amines, and hydroxyl groups, demonstrate good gene transfection performances. Herein, a series of multifunctional cationic nanoparticles (PRP) consisting of photosensitizer cores and PGED shells are readily developed through simple dopamine‐involving processes for versatile bioapplications. A series of experiments demonstrates that PRP nanoparticles are able to effectively mediate gene delivery in different cell lines. PRP nanoparticles are further validated to possess remarkable capability of combined PDT and gene therapy for complementary tumor treatment. In addition, because of their high dispersities in biological matrix, the PRP nanoparticles can also be used for in vitro and in vivo imaging with minimal aggregation‐caused quenching. Therefore, such flexible nanoplatforms with photosensitizer cores and polycationic shells are very promising for multimodal tumor therapy with high efficacy.
Tập 14 Số 22 - 2018
On‐Chip Fabrication of Well‐Aligned and Contact‐Barrier‐Free GaN Nanobridge Devices with Ultrahigh Photocurrent Responsivity
Tập 4 Số 7 - Trang 925-929 - 2008
Organic Molecular Nanotechnology Abstract A new route to bottom‐up organic nanotechnology is presented. Molecular building blocks with specific optoelectronic properties are designed and grown via directed self‐assembly arrays of morphologically controlled light‐emitting organic nanofibers on template surfaces. The fibers can be easily transferred from the growth substrate to device platforms either as single entities or as ordered arrays. Due to the extraordinary flexibility in the design of their optoelectronic properties they serve as key elements in next‐generation nanophotonic devices.
Tập 4 Số 2 - Trang 176-181 - 2008
Nanowires for Integrated Multicolor Nanophotonics Abstract Nanoscale light‐emitting diodes (nanoLEDs) with colors spanning from the ultraviolet to near‐infrared region of the electromagnetic spectrum were prepared using a solution‐based approach in which emissive electron‐doped semiconductor nanowires were assembled with nonemissive hole‐doped silicon nanowires in a crossed nanowire architecture. Single‐ and multicolor nanoLED devices and arrays were made with colors specified in a predictable way by the bandgaps of the III–V and II–VI nanowire building blocks. The approach was extended to combine nanoscale electronic and photonic devices into integrated structures, where a nanoscale transistor was used to switch the nanoLED on and off. In addition, this approach was generalized to hybrid devices consisting of nanowire emitters assembled on lithographically patterned planar silicon structures, which could provide a route for integrating photonic devices with conventional silicon microelectronics. Lastly, nanoLEDs were used to optically excite emissive molecules and nanoclusters, and hence could enable a range of integrated sensor/detection “chips” with multiplexed analysis capabilities.
Tập 1 Số 1 - Trang 142-147 - 2005
Protein‐Based Nanomedicine Platforms for Drug Delivery Abstract Protein‐based nanomedicine platforms for drug delivery comprise naturally self‐assembled protein subunits of the same protein or a combination of proteins making up a complete system. They are ideal for drug‐delivery platforms due to their biocompatibility and biodegradability coupled with low toxicity. A variety of proteins have been used and characterized for drug‐delivery systems, including the ferritin/apoferritin protein cage, plant‐derived viral capsids, the small Heat shock protein (sHsp) cage, albumin, soy and whey protein, collagen, and gelatin. There are many different types and shapes that have been prepared to deliver drug molecules using protein‐based platforms, including various protein cages, microspheres, nanoparticles, hydrogels, films, minirods, and minipellets. The protein cage is the most newly developed biomaterial for drug delivery and therapeutic applications. The uniform size, multifunctionality, and biodegradability push it to the frontier of drug delivery. In this Review, the recent strategic development of drug delivery is discussed with emphasis on polymer‐based, especially protein‐based, nanomedicine platforms for drug delivery. The advantages and disadvantages are also discussed for each type of protein‐based drug‐delivery system. magnified image
Tập 5 Số 15 - Trang 1706-1721 - 2009
Simple Synthesis of Functionalized Superparamagnetic Magnetite/Silica Core/Shell Nanoparticles and their Application as Magnetically Separable High‐Performance Biocatalysts Abstract Uniformly sized silica‐coated magnetic nanoparticles (magnetite@silica) are synthesized in a simple one‐pot process using reverse micelles as nanoreactors. The core diameter of the magnetic nanoparticles is easily controlled by adjusting the w value ([polar solvent]/[surfactant]) in the reverse‐micelle solution, and the thickness of the silica shell is easily controlled by varying the amount of tetraethyl orthosilicate added after the synthesis of the magnetite cores. Several grams of monodisperse magnetite@silica nanoparticles can be synthesized without going through any size‐selection process. When crosslinked enzyme molecules form clusters on the surfaces of the magnetite@silica nanoparticles, the resulting hybrid composites are magnetically separable, highly active, and stable under harsh shaking conditions for more than 15 days. Conversely, covalently attached enzymes on the surface of the magnetite@silica nanoparticles are deactivated under the same conditions.
Tập 4 Số 1 - Trang 143-152 - 2008
Mimosa‐Inspired Design of a Flexible Pressure Sensor with Touch Sensitivity
Tập 11 Số 16 - Trang 1886-1891 - 2015
MoS<sub>2</sub>/NiS Yolk–Shell Microsphere‐Based Electrodes for Overall Water Splitting and Asymmetric Supercapacitor Abstract Rational designing of the composition and structure of electrode material is of great significance for achieving highly efficient energy storage and conversion in electrochemical energy devices. Herein, MoS2 /NiS yolk–shell microspheres are successfully synthesized via a facile ionic liquid‐assisted one‐step hydrothermal method. With the favorable interface effect and hollow structure, the electrodes assembled with MoS2 /NiS hybrid microspheres present remarkably enhanced electrochemical performance for both overall water splitting and asymmetric supercapacitors. In particular, to deliver a current density of 10 mA cm−2 , the MoS2 /NiS‐based electrolysis cell for overall water splitting only needs an output voltage of 1.64 V in the alkaline medium, lower than that of Pt/C–IrO2 ‐based electrolysis cells (1.70 V). As an electrode for supercapacitors, the MoS2 /NiS hybrid microspheres exhibit a specific capacitance of 1493 F g−1 at current density of 0.2 A g−1 , and remain 1165 F g−1 even at a large current density of 2 A g−1 , implying outstanding charge storage capacity and excellent rate performance. The MoS2 /NiS‐ and active carbon‐based asymmetric supercapacitor manifests a maximum energy density of 31 Wh kg−1 at a power density of 155.7 W kg−1 , and remarkable cycling stability with a capacitance retention of approximately 100% after 10 000 cycles.
Tập 15 Số 29 - 2019