scholarly journals Fabrication and evaluation of slow-release lignin-based avermectin nano-delivery system with UV-shielding property

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dongmei Mo ◽  
Xiangying Li ◽  
Yong Chen ◽  
Yang Jiang ◽  
Chunfang Gan ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Controlled Release ◽  
Delivery System ◽  
High Speed ◽  
Large Scale ◽  
Diazonium Salt ◽  
Sodium Lignosulfonate ◽  
Ultrasonic Dispersion ◽  
Transmission Electron ◽  
The Stability

AbstractNanopesticide is one of the best pesticide formulation technologies to overcome the disadvantages of traditional pesticides, which has received great attention from the international community. Using high-speed emulsification and ultrasonic dispersion technology, an avermectin nano-delivery system (Av-NDs) with a particle size of 80–150 nm was prepared through embedding the pesticide molecule utilizing the cross-linking reaction between sodium lignosulfonate and p-phenylenediamine diazonium salt. The formulation and composition of Av-NDs were optimized, the morphology of Av-NDs was analyzed by scanning electron microscope, transmission electron microscope and dynamic light scattering, and the structure of Av-NDs was characterized by UV, IR and 1H NMR. Anti-photolysis and controlled-release tests show that the stability of Av-NDs is 3–4 times of the original avermectin (Av) and possesses the pH-responsive controlled release property. Furthermore, the insecticidal activity of Av-NDs is better than that of avermectin suspension concentrate (Av-SC). The Av-NDs with anti-photolysis and controlled-release characteristics is suitable for large-scale industrial production and is capable to be utilized as effective insecticide in the field.

scholarly journals Recent developments and prospects in the composition, extraction, stability, delivery system, digestion and food applications of plant oil bodies

2021 ◽  
Author(s):  
Jia Hao ◽  
Duoxia Xu ◽  
Yangping Cao
Keyword(s):  
Delivery System ◽  
Large Scale ◽  
Protein Identification ◽  
Meat Products ◽  
Calorie Intake ◽  
Oil Bodies ◽  
Plant Oil ◽  
Electrostatic Deposition ◽  
Food Applications ◽  
The Stability

Oil bodies (OBs) are micron- or submicron-sized sub-organelles widely found in plants seeds and nuts. The structure OBs is composed of a core of triglycerides covered by a phospholipid-protein layer, which ensures the stability of the OBs under extreme environmental conditions and further protects core lipids as energy reserves. As naturally pre-emulsified oil-in-water emulsions, OBs have been gradually applied to replace synthetically engineered oil droplets. In this paper, the recent research on the composition, extraction, stability, delivery system, digestion, food applications and future perspectives of plant OBs are reviewed. Recent studies have focused on the OBs surface protein identification and function, large-scale extraction techniques such as enzyme assisted, high pressure, ultrasound, and extrusion and the reconstituted OBs. Electrostatic deposition of polysaccharides significantly improves the stability of OBs emulsions. OBs emulsions have promising applications to encapsulate bioactive compounds, deliver targeted drugs, and prepare gels and edible functional films. The digestive behavior of OBs emulsions is similar to that of protein-stabilized emulsions, which can increase the satiety, effectively help reduce calorie intake and improve the bioavailability of functional factors. It has also promoted the development of simulated dairy, spices and meat products.

Attritious Wear of Silicon Carbide

1976 ◽  
Vol 98 (4) ◽  
pp. 1125-1134 ◽  
Author(s):  
R. Komanduri ◽  
M. C. Shaw
Keyword(s):  
Silicon Carbide ◽  
Electron Microscope ◽  
High Temperature ◽  
High Speed ◽  
Layer By Layer ◽  
Wear Area ◽  
Work Material ◽  
Transmission Electron ◽  
Metal Silicides ◽  
Boundary Fracture

Attritious wear of silicon carbide in simulated grinding tests against a cobalt base superalloy at high speed and extremely small feed rate was studied using a scanning electron microscope (SEM) and an auger electron spectroscope (AES). In many cases the wear area of silicon carbide was found to be concave rather than planar in shape. Several microcracks and grain boundary fracture were also observed. No evidence of metal build-up was observed on silicon carbide which was not the case with aluminum oxide. AES study of the rubbed surface on the work material and transmission electron microscope (TEM) investigation of the wear debris suggest that attritious wear of silicon carbide is due to one or more of the following mechanisms: 1 – Preferential removal of surface atoms on the abrasive, layer by layer, by oxidation under high temperature and a favorably directed shear stress; 2 – disassociation of silicon carbide at high temperature and (a) diffusion of silicon into the work material and formation of metal silicides and (b) diffusion of carbon into the work material and formation of unstable metal carbides (in the present case Ni3C and Co3C) which decompose during cooling to metal and carbon atoms; 3 – pinocoidal cleavage fracture of silicon carbide on basal planes c(0001) resulting in the removal of many micron-sized crystallites.

scholarly journals Temperature-Dependent Raman Scattering of Large Size Hexagonal Bi2Se3 Single-Crystal Nanoplates

2018 ◽  
Vol 8 (10) ◽  
pp. 1794 ◽  
Author(s):  
Fang Zhou ◽  
Yujing Zhao ◽  
Weichang Zhou ◽  
Dongsheng Tang
Keyword(s):  
Electron Microscope ◽  
Single Crystal ◽  
Temperature Coefficient ◽  
Thermoelectric Materials ◽  
Large Scale ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Large Size ◽  
Transmission Electron ◽  
High Figure

Bi 2 Se 3 has extensive application as thermoelectric materials. Here, large-scale Bi 2 Se 3 single-crystal hexagonal nanoplates with size 7.50–10.0 μ m were synthesized successfully by hydrothermal method. X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM) were used to characterize the Bi 2 Se 3 nanoplates, which confirm the single-crystal quality and smooth surface morphology with large size. Micro-Raman spectra over a temperature range of 83–603 K were furthermore used to investigate the lattice dynamics of Bi 2 Se 3 nanoplates. Both 2A g 1 and 1E g 2 modes shift evidently with reduced temperature. The line shape demonstrates a significant broadening of full width at half maximum (FWHM) and red-shift of frequency with increased temperature. The temperature coefficient of A 1 g 1 , E g 2 , A 1 g 2 modes were determined to be −1.258 × 10 − 2 cm − 1 /K, −1.385 × 10 − 2 cm − 1 /K, −2.363 × 10 − 2 cm − 1 /K, respectively. Such low temperature coefficient may favor the obtaining of a high figure of merit (ZT) and indicate that Bi 2 Se 3 nanoplates were used as excellent candidates of thermoelectric materials.

scholarly journals Study on Acc/Dec Algorithm Based on Piecewise Polynomial in CNC

2011 ◽  
Vol 2-3 ◽  
pp. 43-47 ◽  
Author(s):  
Guo Shun Ji ◽  
Zhi Ping Chen ◽  
Ju Yong Zhang ◽  
Wei Liu
Keyword(s):  
High Speed ◽  
Large Scale ◽  
Polynomial Function ◽  
Tracking Accuracy ◽  
Feedrate Planning ◽  
Smooth Motion ◽  
Planning Algorithm ◽  
S Curve ◽  
The Stability ◽  
Motion Profile

In order to improve the stability of feed movement in high speed CNC system, the feedrate planning algorithm based on piece-wise polynomial function was proposed. The flexible transition of feedrate was realized through maintaining linear continuous jerk. The principle of the proposed algorithm was introduced and the method to generate smooth motion profile based on the proposed algorithm was presented. The rapidity, stability and tracking accuracy of the feedrate planning algorithm to linearity, S curve and the proposed one were analyzed. The proposed algorithm is simple and it can be applied in acceleration/deceleration before interpolation in high speed feed movement to improve the stability of it. The proposed algorithm was applied in multi-contour high speed processing and the result indicated that it could improve the stability of large-scale parts motion.

Green Synthesis of Platinum-encapsulated Nickel Nanocatalyst and Its Microstructure Evaluation

2009 ◽  
Vol 1213 ◽  
Author(s):  
Iliana Medina-Ramirez ◽  
Xu-Bin Pan ◽  
Sajid Bashir ◽  
Jingbo Louise Liu
Keyword(s):  
Particle Size ◽  
Electron Microscope ◽  
Particle Size Distribution ◽  
Colloidal Suspension ◽  
Cost Effective ◽  
X Ray ◽  
Microstructure Evaluation ◽  
Transmission Electron ◽  
Colloidal Method ◽  
The Stability

AbstractPlatinum (Pt) is the most efficient and highly utilized electrocatalsyt; however its high cost hinders its widespread use as a stand-alone catalyst. To remedy this problem, a nickel (Ni) encapsulated by Pt (NiⓔPt) nanocatalyst was fabricated using a cost-effective green colloidal method. The NiⓔPt nanoparticles (NPs) were then characterized using transmission electron microscope (TEM) equipped with X-ray energy dispersive spectroscopy (EDS), and X-ray powder diffraction (XRD) to determine the particle size distribution, morphology, elemental composition, and crystalline phase structure. The surface energetic was also measured using ZetaPALS™ to identify the stability of the colloidal suspension.

Applications of Electron Tomography on Advanced DRAM

2007 ◽  
Author(s):  
Jian-Shing Luo ◽  
Jeremy D. Russell ◽  
Lang-Yu Huang ◽  
Tsang-Pei Chen
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Barrier Layer ◽  
High Speed ◽  
Electron Tomography ◽  
Random Access ◽  
Case Examples ◽  
Step Coverage ◽  
Transmission Electron ◽  
Stem Tomography

Abstract It is well known that pursuing the miniaturization of devices to lower the cost and increase high-speed performance are extremely important goals for dynamic random access memory (DRAM). Therefore, electron tomography has a high potential for application to novel generation DRAMs. In this article, several real-case examples of electron tomography on 90 nm technology DRAM, including barrier layer step coverage, via fill process observations and defect analysis are reported. These cases were demonstrated to show the applications of bright field-transmission electron microscope (BF-TEM) and HADDF- scanning transmission electron microscope (STEM) tomography to analyze barrier layer step coverage, defects, and W fill quality in advanced DRAM. By appropriate use of BF-TEM or HAADF STEM tomography, optimal information for failure analysis, root cause clarification, and subsequent process improvements can be obtained. Electron tomography holds significant advantages in comparison to traditional TEM imaging for appropriate cases.

scholarly journals Ultrastructure study of Vanda Kasem's Delight orchid's protocorm-like body

2016 ◽  
Vol 34 (3) ◽  
pp. 333-339 ◽  
Author(s):  
Pavallekoodi Gnasekaran ◽  
Maziah Mahmood ◽  
Sreeramanan Subramaniam
Keyword(s):  
Electron Microscope ◽  
Genetic Engineering ◽  
Cross Sections ◽  
Large Scale ◽  
Cut Flowers ◽  
Bipolar Structure ◽  
Culture Techniques ◽  
Transmission Electron ◽  
Dividing Cells ◽  
Transmission Electron Microscope Analysis

ABSTRACT Growing orchids has been classified as an international business since it covers 8% of the world floriculture trade. Thus, large-scale micropropagation of orchid using tissue culture techniques and improvement of some essential traits, such as resistances to various diseases and pests, and tolerances to environmental stresses, such as low temperatures and low light intensities, via genetic engineering acknowledged the orchids as one of the top ten cut flowers. Protocorm-like bodies (PLBs) are excellent explants for clonal propagation, artificial seeds development and genetic engineering since they are organized and easily regenerable somatic embryos that propagate rapidly. Vanda Kasem's Delight hybrid orchid's PLBs derived from shoot tip culture were examined in order to understand the fundamental ultrastructure of PLB. Examination of the cross sections of PLB revealed that PLB is made of a discrete bipolar structure that contains anterior and posterior meristems. Actively dividing meristem cells and outer layer lined by several rows of small and isodiametric cells with a dense cytoplasm and a prominent nucleus were also observed via cytological studies. Scanning Electron Microscope investigations revealed that the surface of PLBs is occupied by vertically positioned branched trichome appendages and regularly spaced stomatal openings with two guard cells. Organelles such as mitochondria of various sizes, shapes and biconvex chloroplast in the cytoplasm were revealed by Transmission Electron Microscope analysis. Hence, inheriting actively dividing cells, and bestowed with elements related to transpiration, photosynthesis and energy synthesizing power house makes PLB a suitable explant for micropropagation and genetic engineering studies.

scholarly journals Study on acc/dec Algorithm Based on Piece-Wise Polynomial in CNC

2013 ◽  
Vol 753-755 ◽  
pp. 1790-1794
Author(s):  
Guo Shun Ji
Keyword(s):  
High Speed ◽  
Large Scale ◽  
Polynomial Function ◽  
Cnc System ◽  
Feedrate Planning ◽  
Smooth Motion ◽  
Planning Algorithm ◽  
The Stability ◽  
Motion Profile

In order to improve the stability of feed movement in high speed CNC system, the feedrate planning algorithm based on piece-wise polynomial function was proposed. The flexible transition of feedrate was realized through maintaining linear continuous jerk. The principle of the proposed algorithm was introduced and the method to generate smooth motion profile based on the proposed algorithm was presented. The proposed algorithm is simple and it can be applied in acceleration/deceleration before interpolation in high speed feed movement to improve the stability of it. The proposed algorithm was applied in multi-contour high speed processing and the result indicated that it could improve the stability of large-scale parts motion.

scholarly journals Facile Synthesis of Template-Induced SnO2Nanotubes

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Yang Liu ◽  
Yang Jiao ◽  
Fengyu Qu ◽  
Lihong Gong ◽  
Xiang Wu
Keyword(s):  
Electron Microscope ◽  
Large Scale ◽  
Average Diameter ◽  
X Ray Diffraction ◽  
Facile Hydrothermal Method ◽  
X Ray ◽  
Transmission Electron ◽  
Experimental Parameters ◽  
Mild Temperature ◽  
Temperature Time

Large scale SnO2nanotubes are successfully obtained by a facile hydrothermal method at a mild temperature. The morphologies and the microstructures of the as-synthesized SnO2products are characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM). The average diameter of the nanotubes is about 100 nm. The phase and composition of the as-obtained products are investigated by X-ray diffraction (XRD). A series of comparison experiments were conducted by varying the experimental parameters, such as temperature, time, and the amount of the alkali, to study the formation mechanism of SnO2nanotubes.

Sign in / Sign up

Export Citation Format

Share Document