scholarly journals Rekayasa Permukaan Lapisan Tipis Kitosan Sebagai Dasar Pengembangan Teknologi Self Cleaning

2018 ◽  
Vol 2 (2) ◽  
pp. 16-19
Author(s):  
Eka Rahmawati
Keyword(s):  
Spray Coating ◽  
Dip Coating ◽  
Self Cleaning

Rekayasa lapisan tipis dari bahan kitosan telah dihasilkan dengan pengaplikasian metode pelapisan dan konsentrasi yang berbeda. Variasi konsentrasi kitosan 0,2 % -1 % serta metode pelapisan spray dan dip coating mengasilkan morfologi yang berbeda yang diamati dengan menggunakan mikroskop optik dengan perbesaran 100 X.  Semakin besar konsentrasi maka lapisan yang dihasilkan semakin tidak rata dan kasar. Demikian pula lapisan yang dihasilkan dengan single dip coating akan terlihat lebih rata dan halus bila dibandingkan dengan pelapisan dengan metode multi dip coating dan spray coating. Perbedaan morfologi lapisan dapat dimanfaatkan dalam teknologi self cleaning.

scholarly journals Fabrication Techniques for Graphene Oxide-Based Molecular Separation Membranes: Towards Industrial Application

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 757
Author(s):  
Ohchan Kwon ◽  
Yunkyu Choi ◽  
Eunji Choi ◽  
Minsu Kim ◽  
Yun Chul Woo ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Large Scale ◽  
Spray Coating ◽  
Dip Coating ◽  
Small Scale ◽  
Scale Production ◽  
Separation Membranes ◽  
Current Review ◽  
Slot Die ◽  
Continuous Fabrication

Graphene oxide (GO) has been a prized material for fabricating separation membranes due to its immense potential and unique chemistry. Despite the academic focus on GO, the adoption of GO membranes in industry remains elusive. One of the challenges at hand for commercializing GO membranes lies with large-scale production techniques. Fortunately, emerging studies have acknowledged this issue, where many have aimed to deliver insights into scalable approaches showing potential to be employed in the commercial domain. The current review highlights eight physical methods for GO membrane fabrication. Based on batch-unit or continuous fabrication, we have further classified the techniques into five small-scale (vacuum filtration, pressure-assisted filtration, spin coating, dip coating, drop-casting) and three large-scale (spray coating, bar/doctor blade coating, slot die coating) approaches. The continuous nature of the large-scale approach implies that the GO membranes prepared by this method are less restricted by the equipment’s dimensions but rather the availability of the material, whereas membranes yielded by small-scale methods are predominately limited by the size of the fabrication device. The current review aims to serve as an initial reference to provide a technical overview of preparing GO membranes. We further aim to shift the focus of the audience towards scalable processes and their prospect, which will facilitate the commercialization of GO membranes.

scholarly journals Thin films of copper phthalocyanine deposited by solution processing methods

2020 ◽  
Vol 38 (1) ◽  
pp. 79-90
Author(s):  
Hubert Gojzewski ◽  
Fatemeh Ghani ◽  
Mirosław Szybowicz
Keyword(s):  
Thin Films ◽  
Copper Phthalocyanine ◽  
Substrate Surface ◽  
Spray Coating ◽  
Solution Concentration ◽  
Dip Coating ◽  
Solution Processing ◽  
Ambient Conditions ◽  
Processing Methods ◽  
Main Technique

AbstractIn this work, we show and discuss the surface structure picture of copper phthalocyanine (CuPc) thin films deposited from trifluoroacetic acid (TFA) solvent onto silicon substrates at ambient conditions by four solution processing methods, namely drop-casting, dip-coating, spin-casting and spray-coating. The CuPc films were studied by AFM, as the main technique, and complemented by micro-Raman spectroscopy. Essentially, such thin films consist of CuPc molecular nanoribbons of a fixed ~1 nm thickness. CuPc molecules are arranged in an in-plane direction and formed in stacks under a defined tilt angle with respect to the substrate surface (monolayer) or underlying CuPc layer (multilayer). The film morphology takes various forms depending on the solution concentration, number of layers, and the deposition method. For instance, the morphology varies from very wide (~600 nm) but flat (~1 nm) ribbons for films prepared by dip-coating to crystallized rod-like features (multi-layered ribbons) when obtained by spray-coating. The factors studied in this paper should be taken into consideration in designing and controlling the criteria for rigorous CuPc film architecture.

scholarly journals Systems developed for application as self-cleaning surfaces and/or antimicrobial properties: a short review on materials and production methods

Cerâmica ◽  
2019 ◽  
Vol 65 (375) ◽  
pp. 477-484 ◽  
Author(s):  
M. P. Madeira ◽  
A. O. Lobo ◽  
B. C. Viana ◽  
E. C. Silva Filho ◽  
J. A. Osajima
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Photocatalytic Activity ◽  
Medical Devices ◽  
Spin Coating ◽  
Antimicrobial Properties ◽  
Short Review ◽  
Dip Coating ◽  
Production Methods ◽  
Self Cleaning

Abstract Herein we present a short review of different materials and techniques that have been used for the production of surfaces with self-cleaning and/or antimicrobial properties. From this, it was verified that titanium dioxide was the most frequently used compound to obtain surfaces with these properties; however, other materials such as silica, zinc and silver have also been used for this purpose. The spin-coating and dip-coating techniques were the most used techniques, and the bacteria Staphylococcus aureus and Escherichia coli were the most used in the antimicrobial assays. The analyzed studies showed that it is possible to obtain surfaces with both self-cleaning and/or antimicrobial properties, as well as with photocatalytic activity. Regarding possible applications, it is possible to highlight the interest in the production of glass and medical devices with self-cleaning and/or antimicrobial action.

Structural Tuning Using a Novel Membrane Reactor for Carbon Nanotube Synthesis

2015 ◽  
Vol 1752 ◽  
pp. 39-44
Author(s):  
Dane J. K. Sheppard ◽  
L. P. Felipe Chibante
Keyword(s):  
Particle Size ◽  
Carbon Nanotube ◽  
Membrane Reactor ◽  
Chemical Vapour ◽  
Spray Coating ◽  
Catalyst Particle ◽  
Dip Coating ◽  
Asymmetric Membrane ◽  
Structural Morphology ◽  
Starting Point

ABSTRACTCarbon nanotubes come in many varieties, with chemical, mechanical, and electrical properties depending on carbon nanotube (CNT) structural morphology. In order to provide a platform for CNT structural tuning, a membrane reactor was designed and constructed. This reactor provided more intimate gas-catalyst contact by decoupling the carbon feedstock gas from carrier gas in a chemical vapour deposition (CVD) environment using an asymmetric membrane and a macroporous membrane. Growth using this membrane reactor demonstrated normalized yield improvements of ∼300% and ∼1000% for the asymmetric and macroporous membrane cases, respectively, over standard CVD methods. To illustrate the possibility for control, growth variation with time was successfully demonstrated by growing vertically aligned multi-walled CNTs to heights of 0.71 mm, 1.36 mm, and 1.84 mm after growth for 15, 30, and 60 minutes in a commercial thermal CVD reactor. To demonstrate CNT diameter control via catalyst particle size, dip coating and spray coating methods were explored using ferrofluid and Fe(NO3)3 systems. CNT diameter was demonstrated to increase with increasing particle size, yielding CNT like growth with diameters ranging from 15 -150 nm. Demonstration of these dimensions of control coupled with the dramatic efficiency increases over growth in a commercialized CVD reactor establish this new reactor technology as a starting point for further research into CNT structural tuning.

Self Cleaning Photoactive TiO2 Coatings on SLS Glasses by Sol-Gel Dip Coating

2004 ◽  
Vol 264-268 ◽  
pp. 407-410 ◽  
Author(s):  
E.D. Şam ◽  
M. Urgen ◽  
F.Z. Tepehan ◽  
Volkan Gunay
Keyword(s):  
Sol Gel ◽  
Dip Coating ◽  
Self Cleaning

Facile, Scalable Spray-Coating of Stable Emulsion for Transparent Self-Cleaning Surface of Cellulose-Based Materials

2018 ◽  
Vol 6 (9) ◽  
pp. 11335-11344 ◽  
Author(s):  
Jie Wei ◽  
Gang Zhang ◽  
Jing Dong ◽  
Huatian Wang ◽  
Yunlong Guo ◽  
...  
Keyword(s):  
Spray Coating ◽  
Stable Emulsion ◽  
Self Cleaning

scholarly journals Progress in Sol-Gel Technology for the Coatings of Fabrics

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1838 ◽  
Author(s):  
Aravin Prince Periyasamy ◽  
Mohanapriya Venkataraman ◽  
Dana Kremenakova ◽  
Jiri Militky ◽  
Yan Zhou
Keyword(s):  
Flame Retardant ◽  
Sol Gel ◽  
Dip Coating ◽  
Uv Protection ◽  
Water Repellent ◽  
Water Separation ◽  
Factors Affecting ◽  
Wrinkle Resistance ◽  
Color Changes ◽  
Self Cleaning

The commercial availability of inorganic/organic precursors for sol-gel formulations is very high and increases day by day. In textile applications, the precursor-synthesized sol-gels along with functional chemicals can be deposited onto textile fabrics in one step by rolling, padding, dip-coating, spraying or spin coating. By using this technology, it is possible to provide fabrics with functional/multi-functional characteristics including flame retardant, anti-mosquito, water- repellent, oil-repellent, anti-bacterial, anti-wrinkle, ultraviolet (UV) protection and self-cleaning properties. These surface properties are discussed, describing the history, basic chemistry, factors affecting the sol-gel synthesis, progress in sol-gel technology along with various parameters controlling sol-gel technology. Additionally, this review deals with the recent progress of sol-gel technology in textiles in addressing fabric finishing, water repellent textiles, oil/water separation, flame retardant, UV protection and self-cleaning, self-sterilizing, wrinkle resistance, heat storage, photochromic and thermochromic color changes and the improvement of the durability and wear resistance properties.

Porous SiO2/TiO2 Bilayer Antireflection Coatings with Self-Cleaning Capacity

2011 ◽  
Vol 233-235 ◽  
pp. 2970-2974 ◽  
Author(s):  
Ruo Yu Chen ◽  
Jian Wu Wang ◽  
Hong Ning Wang ◽  
Wei Yao ◽  
Jing Zhong
Keyword(s):  
Methyl Orange ◽  
Mechanical Strength ◽  
Sol Gel ◽  
Dip Coating ◽  
Antireflection Coatings ◽  
Force Microscopy ◽  
Atomic Force ◽  
Coating Method ◽  
Self Cleaning ◽  
Dip Coating Method

The porous SiO2/TiO2bilayer antireflection coatings with self-cleaning capacity have been prepared by a sol-gel dip-coating method, the surfactant template, Pluronic F123 (PF123) was added to the sol as a pore generator. The performances of the coatings were analyzed with ultraviolet visible spectrophotometer (UV-Vis), scanning electron microscope (SEM) and atomic force microscopy (AFM). The self-cleaning function of coatings was evaluated by means of photocatalytic degradation of methyl orange in aqueous solution, and mechanical strength of the coatings has also been studied. The results indicate that the average transmittance of porous SiO2/TiO2coating increases by 6% as compared to uncoated glass, the coating has a small particle size, a porous structure and a low roughness. After illuminated by ultraviolet light for 3 h, the 5 mg/L methyl orange can be degraded by 56.5%. In addition, the coating has an excellent mechanical strength.

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