Deposition of Sorption and Photocatalytic Material on Nanofibers and Fabric by Controlled Sublimation

2018 ◽  
Vol 936 ◽  
pp. 63-67 ◽  
Author(s):  
Richard Dvorsky ◽  
Ladislav Svoboda ◽  
Jiří Bednář ◽  
Pavel Mančík ◽  
Dalibor Matýsek ◽  
...  
Keyword(s):  
Silica Gel ◽  
Carbon Nitride ◽  
Graphene Nanosheets ◽  
Aqueous Suspension ◽  
Water Molecules ◽  
Application Potential ◽  
Photocatalytic Material ◽  
Porous Silicate ◽  
Highly Porous ◽  
High Application

This paper presents a new method of deposition of photocatalytic sorbent on nanofibers. This deposition uses controlled sublimation of water molecules from the vacuum-gel that is patent-protected. Silica gel nanostructures are precipitated by heterogeneous nucleation on the surface of nanofibres from an aqueous suspension of silicate nanoparticles and semiconductor carbon nitride (C3N4) or graphene nanosheets. After rapid solidification of gel (at least 104K/s), the nanofibers coated with the silica gel dispersion C3N4, or graphene are subjected to controlled sublimation at – 41 °C. This technology produced a nanofibrous material, which is stably coated with a highly porous silicate sorbent including dispersed photocatalytic nanoparticles. This textile material has a total sorption surface area of the order of hundreds m2/g. Unlike conventional sorbents, it is capable due to dispersed photocatalytic nanoparticles to regenerate sorption capacity by the absorption of visible light. The results of the preliminary research confirmed the high application potential of new controlled sublimation technology in the production of regenerable photocatalytic sorption fabrics.

Spatially Confined Formation of Single Atoms in Highly Porous Carbon Nitride Nanoreactors

ACS Nano ◽  
2021 ◽  
Author(s):  
Yunpeng Zuo ◽  
Tingting Li ◽  
Ning Zhang ◽  
Tianyun Jing ◽  
Dewei Rao ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Carbon Nitride ◽  
Single Atoms ◽  
Highly Porous

scholarly journals The Layered Structure of Cu2(H2O)4[C4H4N2][C6H2(COO)4]·2H2O

2019 ◽  
Author(s):  
Roberto Köferstein
Keyword(s):  
Nitrogen Atom ◽  
Single Crystals ◽  
Silica Gel ◽  
Layered Structure ◽  
Water Molecules ◽  
Two Dimensional ◽  
Space Group ◽  
Distorted Octahedral ◽  
Oxygen Atoms

Triclinic single crystals of Cu2(H2O)4[C4H4N2][C6H2(COO)4]·2H2O have been grown in anaqueous silica gel. Space group P-1 (Nr. 2), a = 723.94(7) pm, b = 813.38(14) pm, c = 931.0(2) pm, α = 74.24(2)°, β = 79.24(2)°, γ = 65.451(10)°, V = 0.47819(14) nm3, Z = 1. Cu2+ is coordinated in a distorted, octahedral manner by two water molecules, three oxygen atoms ofthe pyromellitate anions and one nitrogen atom of pyrazine (Cu—O 194.1(2)–229.3(3) pm;Cu–N 202.0(2) pm). The connection of Cu2+ and [C6H2(COO)4)]4− yields infinite strands,which are linked by pyrazine molecules to form a two-dimensional coordination polymer.Thermogravimetric analysis in air showed that the dehydrated compound was stable between175 and 248 °C. Further heating yielded CuO.

scholarly journals The Marine Catenovulum agarivorans MNH15 and Dextranase: Removing Dental Plaque

Marine Drugs ◽  
2019 ◽  
Vol 17 (10) ◽  
pp. 592 ◽  
Author(s):  
Lai ◽  
Liu ◽  
Liu ◽  
Deng ◽  
Feng ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Performance Liquid Chromatography ◽  
Dental Plaque ◽  
Metal Ion ◽  
High Performance ◽  
Opposite Effect ◽  
Nacl Concentration ◽  
Initial Ph ◽  
Application Potential ◽  
High Application

Dextranase, a hydrolase that specifically hydrolyzes α-1,6-glucosidic bonds, has been used in the pharmaceutical, food, and biotechnology industries. In this study, the strain of Catenovulum agarivorans MNH15 was screened from marine samples. When the temperature, initial pH, NaCl concentration, and inducer concentration were 30 °C, 8.0, 5 g/L, and 8 g/L, respectively, it yielded more dextranase. The molecular weight of the dextranase was approximately 110 kDa. The maximum enzyme activity was achieved at 40 °C and a pH of 8.0. The enzyme was stable at 30 °C and a pH of 5–9. The metal ion Sr2+ enhanced its activity, whereas NH4+, Co2+, Cu2+, and Li+ had the opposite effect. The dextranase effectively inhibited the formation of biofilm by Streptococcus mutans. Moreover, sodium fluoride, xylitol, and sodium benzoate, all used in dental care products, had no significant effect on dextranase activity. In addition, high-performance liquid chromatography (HPLC) showed that dextran was mainly hydrolyzed to glucose, maltose, and maltoheptaose. The results indicated that dextranase has high application potential in dental products such as toothpaste and mouthwash.

scholarly journals Dynamics and stability of icosahedral Fe–Pt nanoparticles

2015 ◽  
Vol 17 (42) ◽  
pp. 28096-28102 ◽  
Author(s):  
Paweł T. Jochym ◽  
Jan Łażewski ◽  
Małgorzata Sternik ◽  
Przemysław Piekarz
Keyword(s):  
Ab Initio ◽  
Theoretical Study ◽  
Pt Nanoparticles ◽  
Application Potential ◽  
High Application

An ab initio theoretical study on icosahedral Fe–Pt clusters – one of the most interesting nanoalloys with high application potential.

Engineering stiffness in highly porous biomimetic gelatin/tertiary bioactive glass hybrid scaffolds using graphene nanosheets

2020 ◽  
Vol 154 ◽  
pp. 104668
Author(s):  
Ehsan Zeimaran ◽  
Sara Pourshahrestani ◽  
Hui Yin Nam ◽  
Nasrul Anuar bin Abd Razak ◽  
Katayoon Kalantari ◽  
...  
Keyword(s):  
Bioactive Glass ◽  
Graphene Nanosheets ◽  
Hybrid Scaffolds ◽  
Highly Porous

Mechanically Strong and Hierarchical Porous Silica Ceramics via Gelcasting-Lyophilization

2016 ◽  
Vol 697 ◽  
pp. 414-418
Author(s):  
Wei Wan ◽  
Jian Yang ◽  
Yong Bao Feng ◽  
Tai Qiu
Keyword(s):  
Raw Materials ◽  
Aqueous Suspension ◽  
Three Dimensional ◽  
Porous Silica ◽  
Hierarchical Porous ◽  
Exhaust Fumes ◽  
Materials Used ◽  
Gelcasting Process ◽  
Hierarchical Pore ◽  
Highly Porous

Highly porous silica ceramics were prepared by in-situ gelation of an aqueous suspension with well dispersed silica particles and N’N-dimethylacrylamide (DMAA) monomer, followed by lyophilization and pressureless sintering. The gelcasting process was imparted by polymerization of DMAA. The silica raw materials used in this experiment are the dusts collected from the exhaust fumes of silicon industry. The as-obtained porous silica ceramics had three-dimensional and hierarchical pore structure and the porosity ranged from 75 to 88 % as the sintering temperature varied from 850 to 1050 °C. In addition, the porous silica ceramics appeared to have strong mechanical strength. Compressive strength of the porous silica ceramics was as high as 3.2 MPa even when the porosity was nearly 80%. The gelcasting-lyophilization method was proved to be a novel and promising route for the preparation of highly porous and mechanically strong materials.

scholarly journals The Nature of Silanol Groups on the Surfaces of Silica, Modified Silica and Some Silica Based Materials

2014 ◽  
Vol 998-999 ◽  
pp. 3-10 ◽  
Author(s):  
Alfred A. Christy
Keyword(s):  
Silica Gel ◽  
Near Infrared ◽  
Water Molecules ◽  
Modified Silica ◽  
Near Infrared Reflectance ◽  
Modified Silica Gel ◽  
Silanol Groups ◽  
Near Infrared Spectra ◽  
Chemically Modified Silica ◽  
Adsorption Of Water

Silica gel, a material that is produced from the condensation polymerisation of silicic acid, contains surface silanol groups formed during the condensation. The silanol groups on the surface are mostly of free and vicinal silanol groups. These silanol groups can be modified in several different ways. Thermal treatment and hydrothermal treatment can be carried out to alter the concentration proportions between free and hydrogen bonded silanol groups on the surface. They can also be chemically treated with suitable chlorosilanes to modify the silanol groups into polar or non polar materials that can be used in separation science.This article explores the chemical nature of silanol groups on the surfaces of different materials. Near infrared reflectance spectroscopy was used as the instrumental technique in this study. The silanol groups classifications were made by analyzing the near infrared spectra obtained during the adsorption of water molecules. Absorption of the combination frequencies of water molecules in the region 5500- 5000 cm-1were used in characterizing the silanol groups on the surfaces. Second derivative technique was employed in the resolution and detailed analysis of these absorptions.The study reveals that the materials contain free, vicinal and gem silanol groups. Silica gel contains free and vicinal silanol groups, thermally treated silica gel contains fewer vicinal silanol groups compared to the base silica gel, and hydrothermally treated silica gel contains higher concentrations of vicinal silanol groups compared to the base silica gel. Furthermore, the chemically modified silica gel contains vicinal or geminal silanol groups depending on the type of functionality introduced.

scholarly journals Highly porous N-doped graphene nanosheets for rapid removal of heavy metals from water by capacitive deionization

2017 ◽  
Vol 53 (5) ◽  
pp. 881-884 ◽  
Author(s):  
Lianjun Liu ◽  
Xiaoru Guo ◽  
Rebecca Tallon ◽  
Xingkang Huang ◽  
Junhong Chen
Keyword(s):  
Heavy Metals ◽  
Graphene Nanosheets ◽  
Capacitive Deionization ◽  
Efficient Removal ◽  
Graphene Nanosheet ◽  
Removal Of Heavy Metals ◽  
Doped Graphene ◽  
Rapid Removal ◽  
Multiple Heavy Metals ◽  
Highly Porous

Highly porous N-doped graphene nanosheet-based capacitive deionization for rapid and efficient removal of multiple heavy metals from water.

A Solar-Powered In-Vehicle Semiconductor Refrigeration System

2014 ◽  
Vol 587-589 ◽  
pp. 199-202 ◽  
Author(s):  
Yi Tao Liu ◽  
Chang Ping Zhu ◽  
Jun Yang Zhao ◽  
Hao Bo Sun ◽  
Bin Wang ◽  
...  
Keyword(s):  
Remote Control ◽  
Temperature Control ◽  
Model Experiment ◽  
Short Message ◽  
Refrigeration System ◽  
Control Effect ◽  
Environmental Friendly ◽  
Application Potential ◽  
Solar Powered ◽  
High Application

A solar-powered in-vehicle semiconductor refrigeration system by remote control is put forward. With the solar power as the source of energy, the in-vehicle refrigeration system uses the safe and pollution-free semiconductor refrigeration method, and adopts the GSM technology to make the remote control via the short message of the mobile phone, so as to achieve the cooling effect without starting the engine of the car. Through the model experiment, the working current and power consumption as well as the refrigeration temperature control effect of the system were analyzed, and verified the feasibility of the system. Being energy saving and environmental friendly, this design has a high application potential.

scholarly journals Komplexe mit aromatischen Carbonsäuren, IV. Ca2[C6H2(COO)4]·6H2O - Eine neue Schichtstruktur/ Complexes with Aromatic Carboxylic Acids, IV. Ca2[C6H2(COO)4]·6H2O - A Novel Layer Structure

1988 ◽  
Vol 43 (8) ◽  
pp. 993-997 ◽  
Author(s):  
Christian Robl
Keyword(s):  
Hydrogen Bonds ◽  
Single Crystals ◽  
Silica Gel ◽  
Layer Structure ◽  
The Other ◽  
Water Molecules ◽  
Ring Plane ◽  
Weakly Bound ◽  
Carboxylate Groups ◽  
Oxygen Atoms

AbstractSingle crystals of Ca2[C6H2(COO)4]·6H2O were grown in aqueous silica gel. Ca2+ has CN 6+2. The coordination polyhedron is formed by three water molecules and five oxygen atoms of carboxylate groups. Six oxygen atoms are closely bound (235,9-243,9 pm), the two remaining coordination partners are considerably more remote from Ca2+ (268,2 and 273,8 pm). COO- groups chelate Ca2+ in an asymmetric manner, but the C -O bond lengths do not differ markedly (125,2-126,3 pm). The connection of Ca2+ with [C6H2(COO)4]4- leads to rigid layers. Adjacent layers are interlinked by hydrogen bonds. Those oxygen atoms which are weakly bound to Ca2+ are favoured as proton acceptors in hydrogen bonds. The COO groups are tilted differently against the C6-ring plane. One is approximately coplanar, but the other is oriented almost perpendicularly.

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