MORPHOLOGY OF BLACK CARBON AEROSOLS AND UBIQUITY OF 50-NANOMETER BLACK CARBON AEROSOLS IN THE ATMOSPHERE

Different-sized aerosols were collected by an Andersen air sampler to observe the detailed morphology of the black carbon （BC） aerosols which were separated chemically from the other accompanying aerosols, using a Scanning Electron Microscope equipped with an Energy Dispersive X-ray Spectrometer （SEM-EDX）. The results indicate that most BC aerosols are spherical particles of about 50 nm in diameter and with a homogeneous surface. Results also show that these particles aggregate with other aerosols or with themselves to form larger agglomerates in the micrometer range. The shape of these 50-nm BC spherical particles was found to be very similar to that of BC particles released from petroleum-powered vehicular internal combustion engines. These spherical BC particles were shown to be different from the previously reported fullerenes found using Matrix-Assisted Laser Desorption/Ionization Time-Of-Flight Mass Spectrometry （MALDI-TOF-MS）.     

Controllable and flexible cellular network for virus cell-to-cell spread

Cellular networks were constructed based on PEG modification and soft lithography, in which cell numbers and spatial distributions can be controlled. A micro-injector was combined with cellular networks to fix virus induced plaque and virus spread direction, by which virus cell-to-cell spread can be distinguished from cell-free spread.     

Exonuclease-assisted multicolor aptasensor for visual detection of ochratoxin A based on G-quadruplex-hemin DNAzyme-mediated etching of gold nanorod

Microchimica Acta - The authors report on a microneedle-based amperometric nonenzymatic glucose sensor for painless and continuous monitoring of glucose. It consists of 3 × 5 sharp...     

Decorated CuO nanoparticles over chitosan-functionalized magnetic nanoparticles: Investigation of its anti-colon carcinoma and anti-gastric cancer effects

In this study, a green protocol for supporting CuO nanoparticles over chitosan-modified amino-magnetic nanoparticles is described. The physicochemical and morphological properties of the desired nanocomposite assessed by various techniques like ICP, FT-IR, FE-SEM, EDX, TEM, XRD and VSM. In the oncological part of the recent study, the Cu(NO₃)₂, Fe₃O₄, and Fe₃O₄-NH₂@CS/CuO nanocomposite cell viability was very low against human gastric cancer cell lines i.e. MKN45, AGS, and KATO III and human colorectal carcinoma cell lines i.e. HT-29, HCT 116, HCT-8 [HRT-18], and Ramos.2G6.4C10. The IC50 of Fe₃O₄-NH₂@CS/CuO nanocomposite against MKN45, AGS, KATO III, HT-29, HCT 116, HCT-8 [HRT-18], and Ramos.2G6.4C10 cell lines were 517, 525, 544, 282, 214, 420, and 477 µg/mL, respectively. Thereby, the best anti-gastro-duodenal cancers findings of our Fe₃O₄-NH₂@CS/CuO nanocomposite was seen in the HCT 116 cell line case.     

Preparation of a cellulose-based adsorbent and its removal of Disperse Red 3B dye

Cellulose - Cellulosic Juncus effusus fiber with porous structure, belonging to the carbohydrate polymers group, was chemically modified by a resin to form a cellulose-based adsorbent (FA–JE)...     

气凝胶在空间探测中的应用

气凝胶独特的物理特性使得它能在空间探测中被广泛应用。气凝胶超低的密度、极低的热导率以及多孔网络结构使得它能成功地应用在超高速宇宙尘埃粒子捕获、高效热防护、低温推进剂存储、太空服制造等空间探测任务中。对气凝胶在空间探测中的应用情况进行了综述。     

超轻纳米纤维气凝胶的制备及其应用

超轻纳米纤维气凝胶是一种以一维纳米纤维为基本构筑单元的新型气凝胶材料,相比于传统气凝胶,其不仅具有更高的孔隙率和更低的密度,还拥有更优异的机械性能和理化性质,因此该材料的先进制备技术和在新兴领域的创新性应用是近年来超轻气凝胶领域的研究热点。本文结合国内外研究现状,按照材料体系分类系统综述了超轻纤维气凝胶的制备方法、结构特点以及在隔热、吸附、电化学、传感和生物医学等领域的重要应用,提出了现阶段该材料面临的一些挑战,并展望了其在未来的发展方向。     

Characterization of gold nanorods in vivo by integrated analytical techniques: their uptake, retention, and chemical forms

Integrated analytical techniques were used to study the tissue distribution and structural information of gold nanorods (Au NRs) in Sprague-Dawley rats through tail intravenous injection. Before in vivo experiments were conducted, careful characterization of Au NRs was performed. The zeta potential proved that adsorption of bovine serum albumin on Au NRs turned the surface charges from positive to negative as in an in vitro simulation. The biodistribution of Au NRs was investigated quantitatively by inductively coupled plasma mass spectrometry at different time points after injection. As target tissues, both liver and spleen were chosen to further demonstrate the intracellular localization of Au NRs by the combination of transmission electron microscopy and energy-dispersive X-ray spectroscopy. Moreover, synchrotron-radiation-based X-ray absorption spectroscopy was employed and it was observed that long-term retention of Au NRs in liver and spleen did not induce obvious changes in the oxidation states of gold. Therefore, the present systematic method can provide important information about the fates of Au NRs in vivo and can also be extended to study the biological effects of other metallic nanomaterials in the future.