Sol-Gel Gateway Forum http://www.solgel.com/sgforum This is an XML content feed of; Sol-Gel Gateway Forum : Last 10 Posts Fri, 10 Feb 2012 11:18:01 +0000 Wed, 17 Nov 2010 01:38:05 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 8.05 30 www.solgel.com/sgforum/RSS_topic_feed.asp Coatings & Films : CuO metohd based on Copper Acetate http://www.solgel.com/sgforum/forum_posts.asp?TID=1775&PID=4024#4024 Author: mehulmatrix
Subject: CuO metohd based on Copper Acetate
Posted: 17 November 2010 at 1:38am

Hello All,
We're trying to make CuO films based on Copper Acetate with 2-methoxy alcohol and Acetyl Acetone. The problem is that the Oxygen content the film is around 99% and so CuO formation is not taking place.
Any suggestion or some recipes that we can try?
Inputs will be appreciated.

Thanks,
Mehul.]]> Wed, 17 Nov 2010 01:38:05 +0000 http://www.solgel.com/sgforum/forum_posts.asp?TID=1775&PID=4024#4024 Chemistry : bases dissolving TEOS solgel coating http://www.solgel.com/sgforum/forum_posts.asp?TID=1774&PID=4023#4023 Author: jakeconner
Subject: bases dissolving TEOS solgel coating
Posted: 16 March 2010 at 3:32pm

Hi,
I have been working on dip coating of acid catalyzed TEOS sols with an incorporated pH indicator dye (phenol red sodium salt) after dipcoating, I am drying at 125 degrees C for 1hr and have nice films that change color in acid or base solutions. However I seem to have a problem with basic solutions (sodium bicarbonate) at a pH of around 9 dissolving the coating from a glass microscope slide and other glass substrates. Any suggestions?

-Jake
]]> Tue, 16 Mar 2010 15:32:25 +0000 http://www.solgel.com/sgforum/forum_posts.asp?TID=1774&PID=4023#4023 Chemistry : Which Tungsten Alkoxide? http://www.solgel.com/sgforum/forum_posts.asp?TID=1773&PID=4022#4022 Author: yfaheem
Subject: Which Tungsten Alkoxide?
Posted: 23 February 2010 at 8:23am

Hi Everyone,
                    I am a PhD Student from The university of Manchester. I am in serious need to a solution to my query so I would appreciate if someone could advise.

I am working on doping of TiO2 sol-gel films with W ions.

First, I want to know whether W+5 ions are better or W+6 ions to improve the photocatalysis of TiO2?

Secondly, I need to find out which Tungsten Precursor is better, W (VI) Isopropoxide (liquid) or Tungsten (V, VI) ethoxide (solid, liq) or any other?

I think the answer would not be that difficult for someone already working in sol-gel or for a chemist.

Thanks for a look and your effort.

Regards
Yasir
Manchester      
]]> Tue, 23 Feb 2010 08:23:16 +0000 http://www.solgel.com/sgforum/forum_posts.asp?TID=1773&PID=4022#4022 Coatings & Films : TiO2 paste for DSSC http://www.solgel.com/sgforum/forum_posts.asp?TID=1771&PID=4020#4020 Author: Lekha
Subject: TiO2 paste for DSSC
Posted: 06 November 2009 at 5:23am

Hi

I'm using P25 TiO2 nanoparticles to prepare TiO2 film on FTO substrate for DSSC working electrode via doctor blade. I prepare the TiO2 paste in ethanol, I'm facing a problem ie, when i go for multiple coating in order to increase the thickness of film, the film adherence is poor or cracks develop and the film starts to peel off, can anyone suggest a method for preparing thicker films (~10micro meter) via doctor blade using some other solvent or conditions.

 

]]> Fri, 06 Nov 2009 05:23:34 +0000 http://www.solgel.com/sgforum/forum_posts.asp?TID=1771&PID=4020#4020 Sol-Gel and derived Materials : Solgel 2009 Conference http://www.solgel.com/sgforum/forum_posts.asp?TID=1738&PID=4017#4017 Author: :ste:
Subject: Solgel 2009 Conference
Posted: 23 September 2009 at 9:20am

too late...

it was fun!]]> Wed, 23 Sep 2009 09:20:29 +0000 http://www.solgel.com/sgforum/forum_posts.asp?TID=1738&PID=4017#4017 Equipments and Processing Techniques : commercial tool for large area coating http://www.solgel.com/sgforum/forum_posts.asp?TID=1443&PID=4016#4016 Author: sholmarc
Subject: commercial tool for large area coating
Posted: 25 August 2009 at 1:50am

For Spray Pyrolisis Equipment,
 
Please refer to the weblink given below:-
 
http://www.holmarc.com/spray_pyrolysis_equipment.html
]]> Tue, 25 Aug 2009 01:50:01 +0000 http://www.solgel.com/sgforum/forum_posts.asp?TID=1443&PID=4016#4016 Equipments and Processing Techniques : Dip Coating Machine http://www.solgel.com/sgforum/forum_posts.asp?TID=1768&PID=4015#4015 Author: sholmarc
Subject: Dip Coating Machine
Posted: 12 August 2009 at 3:07am

Holmarc’s dip coating unit has been designed to keep operator involvement as minimum as possible so that variables like speed, duration, etc. are maintained accurately by computer control. Movements are achieved by a precision step motor controlled linear stage.
Dip-coating process, includes five stages: immersion, startup, deposition, evaporation and drainage. In the dip coating method, the substrate is slowly dipped into and withdrawn from a tank containing the solution, with a uniform velocity, in order to obtain a uniform coating.
A microprocessor based system along with user friendly software takes care of accurate control throughout the process. Speed, traverse and idling duration can be programmed through the computer. The system is complete with mechanics, substrate holder, electronics and software.
Dip coating is done by immersing a substrate into a tank containing the coating material, removing from the tank, and allowing it to drain. The coated piece can then be dried by force-drying or baking.
The product described here has been developed for specific research applications. It can be customized to suit related research activities in thin film formation.We welcome customization queries.
 
Specifications :
Actuator: Stepper motor
Drive mechanism: Lead screw
Speed control: Available
Power input: 230V, 50Hz
PC connectivity: Serial port (RS 232)
Stroke length max. 75mm
Drawing speed min. 1 micron/sec
Drawing speed max. 6000 micron/sec

Dip Coating Unit with Hot Chamber

This is a special dip coating unit in which the substrate is dipped in the solution and then put in to a heating chamber. The process is repeated in a well defined manner. Temperature inside the chamber is controlled by a micro controller based system. The total controls are achieved through PC. User friendly software provided can be used to control dip duration, dip speed, baking duration, number of dips and heating duration.

Holmarc has also developed a unit in which the solution and dipping mechanisms are housed in a chamber where temperature and humidity are controlled. We welcome customization queries.
 
For queries, Please contact:
 
Vinod. R
Manager-Operations
Holmarc Opto-Mechatronics Pvt Ltd
PB No- 2244, Toll Junction
Edappally, Kochi - 682 024
Kerala. INDIA
P: 091 484 2540075
F: 091 484 2540882
E: sales@holmarc.com
W: www.holmarc.com
 
 
]]> Wed, 12 Aug 2009 03:07:57 +0000 http://www.solgel.com/sgforum/forum_posts.asp?TID=1768&PID=4015#4015 Equipments and Processing Techniques : Hydrothermal Deposition of TiO2 http://www.solgel.com/sgforum/forum_posts.asp?TID=1767&PID=4014#4014 Author: epraizer
Subject: Hydrothermal Deposition of TiO2
Posted: 11 August 2009 at 12:47pm

I am to deposit TiO2 on alumina by hydrothemal method. Reading through literature, most have successfully deposited TiO2 by hydrothermal method using ammonium hexafluorotitanate. My problem is that I don't have this reagent around, what I have is TiO2 powder. A have seen nanowires grown starting with TiO2 powders. Is there any alternate route to hydrothermal method starting from TiO2 powder? Or should I try to make (NH4)TiF6 from TiO2 powder?]]> Tue, 11 Aug 2009 12:47:32 +0000 http://www.solgel.com/sgforum/forum_posts.asp?TID=1767&PID=4014#4014 Sol-Gel and derived Materials : sol-gel as an inorganic amorphous binder? http://www.solgel.com/sgforum/forum_posts.asp?TID=1766&PID=4013#4013 Author: seth46
Subject: sol-gel as an inorganic amorphous binder?
Posted: 11 August 2009 at 6:23am

Hi,
 
I would like to know if it is possible to use sols as binders in porous media (partially sintered ceramics) to increase their cohesion and mechanical properties.
 
I think it should be possible to partially fill pores/voids with a sol containing a high alkoxide/solvent ratio.I would like to use low (below 200°C) curing temperatures for my first experiments in order to keep an amorphous state and low density.
 
Does anyone here has an experience in such binding/impregnating applications? 
If yes, can you indicate me what kind of sol I should experiment?
 
Thanx
]]> Tue, 11 Aug 2009 06:23:12 +0000 http://www.solgel.com/sgforum/forum_posts.asp?TID=1766&PID=4013#4013 Coatings & Films : Resistance (Impedence) Study of TiO2 thin films http://www.solgel.com/sgforum/forum_posts.asp?TID=1765&PID=4012#4012 Author: itoglass
Subject: Resistance (Impedence) Study of TiO2 thin films
Posted: 03 August 2009 at 11:29pm

If the TiO2 thin film is only the buffer layer,I don't think its resistance will effect the working electrode.
And what is the high resistance you measured?
]]> Mon, 03 Aug 2009 23:29:29 +0000 http://www.solgel.com/sgforum/forum_posts.asp?TID=1765&PID=4012#4012