检索结果-南通市图书馆

How synthetic microfibers end up in food & drinking water

在线全文

学校读者我要写书评

暂无评论

China Textile 2019年第5期 44-45页

No one sets out to refresh themselves by drinking plastic. But microscopic pollution are in virtually every body of water on Earth. While the debris comes from a number of sources, including food and drink packaging and cosmetics, research is pointing to synthetic textile microfibers as a major culprit. Studies show hundreds of thousands of microplastic particles can enter the wa-ter supply just by laundering that polo shirt, midi dress or yoga pants.

关键词： synthetic microfibers food drinking water

Top-down Approach for Fabrication of Polymer Microspheres by Interfacial Engineering

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2020年第12期38卷 1286-1293页

作者： Yue Fan De-Hui Wang Jin-Long Yang Jia-Ning Song Xiao-Mei Li Cheng-Lin Zhang Dong-Sheng Wang Long-Quan Chen Jia-Xi Cui Xu Deng Institute of Fundamental and Frontier Sciences Universityof Electronic Science and Technology of ChinaChengdu 610054China Deportment of Physics at Interfaces Max Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany School of Optoelectronic Science and Engineering University of Electronic Science and Technology of ChinoChengdu 670054Chino School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China

Polymer microspheres with uniform size,composition,and surface property have gained extensive researches in past *** bottom-up approaches are using monomers or oligomers to build up desired polymer ***,directly shaping high-molecular-weight polymers into well-ordered polymer microspheres remains a great ***,we reported a facile and efficient top-down approach tofabricate microspheres with high-molecular-weight polymer *** harnessing interfacial engineering-control during the polymer microspheres formation,uniformly sized microspheres could be produced with widely ranged diameters(from 10μm to the capillary length of each polymer melt).The size limitation of this approach could be further extended by a controllable Plateau-Rayleigh instability ***,the top-down approach allows fabrication of microspheres by various polymer melts with surface energy higher than 25 mN/*** work paves a way for green,cost-effective,and customizable production of a variety of functional polymer microspheres without any chemical reaction assistant.

关键词： Superamphiphobic surfaces Microfluidic spinning microfibers Microspheres

Stimulated Brillouin scattering induced all-optical modulation in graphene microfiber

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2019年第1期7卷 8-13页

作者： JIWEN ZHU XUEMEI CHENG YALI LIU RUIDUO WANG MAN JIANG DIAO LI BAOLE LU ZHAOYU REN State Key Lab Incubation Base of Photoelectric Technology and Functional Materials National Photoelectric Technology and Functional Materials& Application International Cooperation Center Institute of Photonics & Photon-Technology Northwest University

Graphene microfibers are burgeoning modulators with great potential in all-optical communication. One of the critical issues that remains to be understood is the dynamic mechanism of light–graphene interaction. Here, we propose a power dependent modulation by using 980 nm pump light and 1064 nm signal light via graphene microfiber, and the results show a strong transmission reduction and frequency blue shift with the increase of pump power. The experimental observation is attributed to a stimulated Brillouin scattering process induced by the pump light. Power and frequency variations are a result of energy transition of the scattered phonon in the fiber. This work reveals the nonlinear effect process in the light–graphene interaction and provides a new method for power and frequency control with graphene all-optical modulation.

关键词： Graphene microfibers burgeoning modulators great potential

Broadband and continuous wave pumped second-harmonic generation from microfiber coated with layered GaSe crystal

在线全文

学校读者我要写书评

暂无评论

Opto-Electronic Advances 2023年第9期6卷 59-68页

作者： Zhen Hao Biqiang Jiang Yuxin Ma Ruixuan Yi Xuetao Gan Jianlin Zhao Key Laboratory of Light Field Manipulation and Information Acquisition Ministry of Industry and Information Technologyand Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710129China

The conversion-efficiency for second-harmonic(SH)in optical fibers is significantly limited by extremely weak second-order nonlinearity of fused silica,and pulse pump lasers with high peak power are widely ***,we propose a simple strategy to efficiently realize the broadband and continuous wave(CW)pumped SH,by transferring a crystalline GaSe coating onto a microfiber with phase-matching *** the experiment,high efficiency up to 0.08%W-1mm-1 is reached for a C-band pump *** high enough efficiency not only guarantees SH at a single frequency pumped by a CW laser,but also multi-frequencies mixing supported by three CW light ***,broadband SH spectrum is also achieved under the pump of a superluminescent light-emitting diode source with a 79.3 nm *** proposed scheme provides a beneficial method to the enhancement of various nonlinear parameter processes,development of quasi-monochromatic or broadband CW light sources at new wavelength regions.

关键词： nonlinear optics second-harmonic generation continuous wave pump high efficiency multi-frequencies mixing broad spectra microfibers gallium selenide

Bond Durability of Carbon-Microfiber-Reinforced Alkali-Activated High-Temperature Cement Adhering to Carbon Steel

在线全文

学校读者我要写书评

暂无评论

Engineering（科研） 2017年第2期9卷 142-170页

作者： Toshifumi Sugama Tatiana Pyatina Brookhaven National Laboratory Sustainable Energy Technologies Department Upton NY USA

The study aims at evaluating the bond durability of a carbon microfiber (CMF)-reinforced alkali-activating calcium aluminate cement (CAC)/fly ash F (FAF) blend cementitious material adhering to carbon steel (CS) under stresses induced by a 350℃ heat-25℃ water cooling cycle. This cementitious material/CS joint sample was originally prepared in an autoclave at 300℃ under a pressure of 8.3 MPa. For comparison, two reference geothermal well cements, Class G modified with silica (G) and calciumaluminum phosphate (CaP), were employed as well reinforced with CMF. In the CAC/FAF blending cement systems, the CAC-derived cementitious reaction products preferentially adhered to CS surfaces, rather than that of FAF-related reaction products. CMF played a pivotal role in creating tough interfacial bond structure of cement layer adhering to CS. The bond toughness also was supported by the crystalline cementitious reaction products including sodalite, brownmillerite, and hedenbergite as major phases, and aragonite, boehmite, and garronite as minor ones. The brownmillerite as an interfacial reaction product between cement and CS promoted the chemical bonding of the cement to CS, while the other phases served in providing the attractive bonding of the cement to CS. The post-stress-test joint samples revealed the formation of additional brown-millerite, aragonite, and garronite, in particular brownmillerite as the major one. The combination of chemical bonding and self-advancing adherence behavior of the cement was essential for creating a better interfacial bond structure. A similar interfacial bond structure was observed with CaP. The crystalline phase composition of the autoclaved cement revealed apatite, zeolite, and ferrowyllieite as major reaction products, and aragonite and al-katoite as the minor ones. Ferrowyllieite was identified as cement/CS interfacial reaction product contributing to the chemical bond of cement, while the other phases aided in providing the attractive bo

关键词： Carbon microfibers Calcium Aluminate Cement Fly Ash Thermal Shock

Low-Density Microplastics in Recreational Parks of Al Ain, United Arab Emirates: Abundance, Composition, and Potential Effects on Soil Health

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Protection 2024年第2期15卷 109-123页

作者： Rener De Jesus Ahmed Abuibaid Bassam Al-Hindawi Ruwaya AlKendi Department of Biology College of Science United Arab Emirates University Al Ain UAE Department of Chemistry College of Science United Arab Emirates University Al Ain UAE

Microplastics (MPs) have been an emerging concern due to their harmful effects on the ecosystem and are ubiquitous in various habitats, from marine to terrestrial environments. However, studies on the presence of MPs in recreational areas are limited. One of the previous works has reported that urban recreational parks are considered “sinks” for plastic debris, including MPs. In this study, low-density MPs (LD-MPs) in soil samples collected from recreational parks of Al Ain, United Arab Emirates (UAE) were isolated by density flotation method. Results showed that these parks have varying levels of LD-MPs caused by various anthropogenic activities, such as sludge use and application of reclaimed water from wastewater treatment facilities in those areas. These plastic particles were isolated in 87% of the soil samples, with an average concentration of 1550 ± 340 MPs/kg. Predominantly, these comprised large LD-MPs (300 - 5000 μm), with red and blue being the most common colors. Fourier transform infrared (FTIR) spectroscopy identified possible synthetic polymers, including polyethylene and polypropylene. Additionally, a negative correlation was observed between LD-MP concentration and soil pH and moisture content, indicating potential adverse effects on soil health. These findings highlight the need for monitoring and managing microplastic pollution in urban recreational areas to mitigate its ecological impacts.

关键词： Plastic Particles FTIR Analysis microfibers Soil Pollutants Urban Parks

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

聚苯硫醚超细纤维的制备及形态结构研究

聚苯硫醚超细纤维的制备及形态结构研究