56016 research outputs found
Sort by
Terahertz virus-sized gold nanogap sensor
Get PDFWe demonstrated an ultra-sensitive terahertz virus detection method combined with virus-sized gold nanogaps filled with Al2O3. Large-area high-density 20 nm-gap rectangular loop structures, containing a resonant frequency in the terahertz range, were fabricated on a 4-inch wafer using atomic layer lithography. When target viruses with a 60 nm diameter were located on the nanogaps, we observed a significant redshift of the resonant peak already with an average number of about 100 viruses per unit loop due to the strong field confinement and enhancement near the gap. Furthermore, when the virus was tightly attached to an etched gap like a bridge connecting metals, its sensitivity is doubled compared to the unetched gap, which resulted in 400% more resonance frequency shift per single virus particle than our previous work. Full-wave simulations and theoretical calculations based on modal expansions were in good agreement with the experiments, revealing that the resonant transmission spectrum was mostly determined by the change in refractive index in a two-dimensional-like optical hotspot near the nanogap. A further step could be taken to increase sensitivity by tuning nanogap-loops to the absorption frequencies associated with the intermolecular vibrational modes of the viruses and fingerprinting them as well
Preparation of hexene-functionalized graphitic nanoplatelets for effective interaction with Nylon 6
No full textHexene-functionalized graphitic nanoplatelets (He-f-GN) were easily prepared using a mechanochemical reaction between solid graphite and liquid 1-hexene. The He-f-GN exhibited outstanding properties (e.g., high specific surface area, high crystallinity and so on) and could be well distributed in various solvents including formic acid. The He-f-GN/Nylon 6_X nanocomposites were simply prepared using the solution method, and showed excellent mechanical properties and thermal stability compared with the neat Nylon 6. Specifically, the tensile strength and Young's modulus of the He-f-GN/Nylon 6_1 nanocomposites increased by approximately 32.5% and 33.7%, respectively, compared to the neat Nylon 6 due to the special properties of the He-f-GN and its excellent compatibility with Nylon 6 chains. The He-f-GN also acts as nucleation sites, increasing the crystallinity of Nylon 6, and generated hydrogen bonds with the amide groups of the Nylon 6. The new filler, He-f-GN, provides an effective way to increase the performance of polymer, demonstrating good application prospects
Hybrid solid mesh structure for electron beam melting customized implant to treat bone cancer
No full textBone replacement implants manufactured by electron beam melting have been widely studied for use in bone tumor treatment. In this application, a hybrid structure implant with a combination of solid and lattice structures guarantees strong adhesion between bone and soft tissues. This hybrid implant must exhibit adequate mechanical performance so as to satisfy the safety criteria considering repeated weight loading during the patient???s lifetime. With a low volume of a clinical case, various shape and volume combinations, including both solid and lattice structures, should be evaluated to provide guidelines for implant design. This study examined the mechanical performance of the hybrid lattice by investigating two shapes of the hybrid implant and volume fractions of the solid and lattice structures, along with microstructural, mechanical, and computational analyses. These results demonstrate how hybrid implants may be designed to improve clinical outcomes by using patient-specific orthopedic implants with optimized volume fraction of the lattice structure, allowing for effective enhancement of mechanical performance as well as optimized design for bone cell ingrowth
Molecular Design Strategy in Dye-sensitized Photoelectrochemical Cells for the Lignin Oxidation
No full textLignocellulosic biomass comprises lignin, cellulose, and hemicellulose and is the largest renewable carbon source on earth. The conversion of lignin represents an alternative to petroleum as a source for the production of aromatic compounds that serve as feedstocks for aviation fuels. The prospect of using lignin as a renewable and alternative source of aromatic compounds in place of petroleum has motivated several approaches for carrying out lignin depolymerization, but controlling the extent of the reaction to afford specific products remains a significant challenge. To overcome this issue, dye-sensitized photoelectrochemical cells have emerged for the visible-light-driven selective cleavage of the C???C/C???O bond in lignin model compounds at ambient temperature. However, these recent works have been limited to studying a relatively simple Ruthenium dye with limited tunable redox potentials. Compared with metal complexes like ruthenium dyes, the energy levels of organic dyes can be easily tuned by controlling donor????????acceptor (D????????A) configuration. This is because the organic dyes are designed with ??-conjugated organic segments in a donor????????acceptor (D????????A) configuration, and their photophysical properties can be easily tuned by changing the molecular units. Especially, the controlling donor units in organic dyes are very important to study the mechanism of catalyzed cleavage of lignin. My group has studied organic dyes for over 10 years. In this presentation, I will present the molecular design strategy of controlling the donor energy level and the efficient charge transfer for photocatalytic oxidative C???C/C???O bonds cleavage in the DSPEC
?????????????????? ???????????? ????????? ???????????? ???????????? ?????????, ?????? ???????????? ??? ?????? ??????
No full text??????????????? ?????? ???????????? ???????????? ??????, ???????????? ????????? ???????????? ???????????? ???????????? ??? ???????????? ??????????????? ???????????? ?????? ?????? ?????? ?????????
No full text
