Recently, the team member Meng Guowen of the Institute of Solid State Physics, Chinese Academy of Sciences, Hefei Institute of Physical Physics, and the Mao Qinghe Research Group, a researcher at the Institute of Optics and Fine Mechanics of Anhui Province, cooperated with a fiber-optic probe with surface-enhanced Raman scattering (SERS) activity. Research made new progress. Based on the principle of electrostatic adsorption, the research team developed a universal assembly method that assembled a variety of charged metal nanostructures with plasmon properties onto the surface of a tapered fiber probe. The structure can be used as a SERS fiber probe, which is of great significance for remote and portable on-line detection of pollutants. The relevant results are published in ACS Appl. Mater. Interfaces 2015, 7, 17247?17254.
The development of optical fiber communication technology opens up new ways for high-throughput, remote real-time SERS detection of pollutants. The core idea is to couple high-SERS-active nanostructures to the surface of fiber-optic probes and integrate them into portable fiber Raman spectrometers. By collecting and detecting the SERS signal of pollutants, the portable rapid detection of pollutants can be achieved. To achieve this goal, researchers have developed methods such as pull coating, photochemical deposition, or physical vapor deposition to deposit noble metal nanostructures onto fiber probes. However, the SERS fiber probes prepared by these research methods have certain limitations in function. For example, for the pull coating method, SERS-active nanostructures have weak adhesion on the surface of the optical fiber and are easily diffused in liquid samples, thereby affecting the stability of the detection signal; for physical vapor deposition and laser-induced photochemical deposition methods, due to Due to the limitation of the preparation process, it is difficult to precisely regulate the morphology and size of the nanostructure, and the local electromagnetic field enhancement and surface plasmon resonance characteristics cannot be optimized, and the sensitivity of the SERS detection of contaminants cannot be guaranteed.
In response to the above problems, Meng Guowen's research group cooperated with Mao Qinghe's research group to use an electrostatic assembly method (as shown in the following figure) to assemble noble metal nanostructures with positive/negative properties onto the surface of a tapered optical fiber modified with a silane coupling agent. An efficient SERS fiber probe. First, in the process of constructing nanostructures with controllable morphology based on the liquid phase method, the surfactants used can make the nanostructures exhibit controlled surface physicochemical properties, such as positive/negative electricity, hydrophilicity/hydrophobicity, etc. . Secondly, the main component of the optical fiber is silicon oxide, and there are a large number of hydroxyl groups on the surface, which is easy to couple with a silane coupling agent through the formation of Si-O-Si bonds; at the same time, the silane coupling agent has a functional group at the end, so that the entire optical fiber is rich in specific functionality. Therefore, for negatively charged nanostructures (such as citrate-protected gold nanospheres), amino-containing silane coupling agents are selected to modify the fibers; conversely, for positively charged nanostructures (such as CTAB-protected gold nanorods), The use of a carboxyl-terminated silane coupling agent to modify the optical fiber enables efficient assembly of noble metal nanostructures on the surface of the optical fiber. For example, a variety of SERS active nanostructures (gold nanospheres, gold nanorods, gold@silver core shell nanorods, and cubic silver) with different morphology and optical properties can be controllably assembled onto the surface of the optical fiber. This SERS fiber probe has high stability (relative signal deviation less than 3%), many types of fiber (for single-mode, multi-mode, D-type, micro-nano fiber, etc.) and high sensitivity. The parathion-based sensitivity reaches 10 nanomolar. Relevant results have been applied for national invention patents and published in ACS Appl. Mater. Interfaces magazine.
The above research was funded by the National Science and Technology Department's "973" program and the National Natural Science Foundation.
1. Product description:
This multi-layer smoke and gas purifier is designed for vehicle inspection line, laser marking, laser engraving, soldering, etc.
2. Moland Product Series
Portable Fume Extractor series: MLWF50, MLWF70, MLWF100, MLWF360, MLWF120, MLWF200, MLWF280-basic, MLWF280S, MLWF290, MLWF300, MLWF300A, MLWF350, MLWF350D, MLWF400, etc.
Stationary fume extractors: MLWF350-dust bucket type, MLWF500-6T, MLWF500-6T dust bucket type, MLWF500-9T, MLWF800, MLWF800-dust bucket type, MLWF1000, MLWF1500, MLWF2000, MLWF3000, MLWF3500, MLWF4000). The electric control cabinet can be seperated from main equipment for convenient operation when the main equipment is placed outdoors.
Grinding dust extractors: MLWF100D, MLWF150D, MLWF200D, MLWF320-DM, MLWF180, MLWF380, MLWF480) and grinding cabinet (MLWF900). The grinding cabinet is usally equipped with telescopic or fixed grinding room, to form a semi-closed space to control dust and smoke spread. It also improves the filtration efficiency with low air volume and energy consumption.
In order to provide advanced products, our R&D department develops 3 to 5 new products every year, and irregularly improves the performance, appearance, and installation methods of existing products.
Moland participates at least 5 industry exhibitions each year.
6. Central Fume Extraction System
1) Cantilever type fume extraction system
Cantilever dust removal can be used for manual welding conditions where the work stations are evenly distributed and the span is small. The smoke and dust generated by each welding station can be effectively absorbed at the dust generation point, and will not pollute other parts of the workshop. The skeleton of the suction arm is similar to a human arm and can hover in a space within a certain length. The outer layer of the suction arm is a temperature-resistant hose, which not only prevents the hose from being burned by sparks, but also ensures the flexibility of the movement of the suction arm. A unique rotating structure is designed on the position of the Suction Hood to ensure that the suction hood can be aligned with the welding position in any orientation, so that the suction arm can effectively capture the smoke and dust generated during the welding process. The advantage of the suction arm capture is that it can be close to the place where the smoke is generated, and the collection effect is better.
2) Hood suction type fume extraction system
Cantilever dust removal can be used for manual welding conditions where the work stations are evenly distributed and the span is small. The smoke and dust generated by each welding station can be effectively absorbed at the dust generation point, and will not pollute other parts of the workshop. The skeleton of the suction arm is similar to a human arm and can hover in a space within a certain length. The outer layer of the suction arm is a temperature-resistant hose, which not only prevents the hose from being burned by sparks, but also ensures the flexibility of the movement of the suction arm. A unique rotating structure is designed on the position of the suction hood to ensure that the suction hood can be aligned with the welding position in any orientation, so that the suction arm can effectively capture the smoke and dust generated during the welding process. The advantage of the suction arm capture is that it can be close to the place where the smoke is generated, and the collection effect is better.
3) Room tupe fume extraction system
Room-type dust removal is suitable for the purification of fumes and smoke generated during the production of automated equipment, such as welding robots, welding machines, grinding, grinding and polishing of metal and plastic parts, drilling, thermal processing, cutting and crushing, stone processing, powder packaging, solid particles and various dusts and fumes produced by mixing and processing.
For working conditions such as robot automatic welding, circular seam and longitudinal seam welding, the smoke and dust purifier is installed with the robot workstation, so that the workstation has its own dust removal function. The fume and smoke are effectively collected through equipment components such as pipes and dust hoods. The room-type design prevents the volatilization and diffusion of smoke to keep the air in the workshop clean.
The working conditions with moderate welding workpieces and large amounts of dust and smoke are suitable for room-type treatment solutions. The room type centralized dust dedusting solution is divided into side suction and top suction method dust collecting ways. The appropriate solution can be designed according to the site conditions and treatment goals.
4) Blow suction type fume extraction system
Blow-suction type dust removal solution is a ventilation air flow composed of blown air and inhaled air flow. Therefore, it is a dust removal method that can effectively control the spread of pollution sources. This dust removal method is installing exhaust inlets on two-span center column or single-span side column (wall) and air outlets on the opposite wall column to form a circulating air flow to drive the smoke and dust into the purification machine, consequently performing overall dust removal and purification in the workshop. This system occupies a small area and has obvious purification effect, which is suitable for the purification of smoke and smoke in more complex production workshops.
7. Company information
Jinan Moland Environmental Tech Co., Ltd., is located in No. 11889 Jingshi West Road, Changqing District, Jinan City, Shandong, China, established in 2016. It`s an environmental protection technology enterprise specializing in research, development, manufacture and sale of efficient smoke purification systems.
The company is committed to reducing the environmental impact of production process, protecting workers from harmful gases and dust, and creating a cleaner working environment. At present, the companyâ€²s products have been successfully applied in automobile, railway, construction machinery, marine engineering, aviation and other mechanical processing industries, as well as new materials, grain, wood, recycled resources processing and other industries. The company has passed the ISO 9001 quality management system certification, obtained the certification of China Environmental Protection Products issued by China Environmental Protection Industry Association, and CE certification of EU. It also has a number of invention patents, utility model patents and appearance patents. Through continuous R&D and innovation, many products of the company have reached the international leading level.
Molandâ€²s environmental services cover the whole process from project design, product manufacturing to installation, commissioning and after-sales service. We will provide you with the most professional governance program and the best quality service.
Vehicle Inspection Line, waste gas treatment, high efficiency smoke extractor, smoke purifier
Jinan Moland Environmental Tech Co.,Ltd , https://www.sdmoland.com