| 00:00:00 | Metal colloids: their preparation, application, and characterization |
| 00:01:42 | Metal colloids: their preparation, application, and characterization |
| 00:02:19 | In the month that gravitational waves were described….. |
| 00:02:33 | We bring you…….Abstract |
| 00:03:38 | Author’s PhD thesis |
| 00:04:24 | SEM Image of typical catalyst – AFR PhD thesisAverage particle size ~ 10 nm by number |
| 00:05:52 | Obligatory Opening Quotation (O2Q) |
| 00:06:28 | Outline |
| 00:06:58 | What’s a colloid & what’s a sol? |
| 00:08:29 | Roman times - Lycurgus Cup – 4th Century A.D. |
| 00:09:14 | Lycurgus Cup |
| 00:10:07 | Color of gold colloids/sols – Faraday (1850’s) |
| 00:10:57 | Faraday’s paper on gold sols |
| 00:11:29 | So at the beginning of the 1900’s…… |
| 00:11:59 | Zsigmondy – 1905 in German |
| 00:12:14 | Book translated in 1909 by Jerome Alexander |
| 00:12:52 | Comment in the 1905 German edition and not modified for the 1909 1st English edition |
| 00:13:31 | Colloidal gold |
| 00:14:42 | It had to be Mie… |
| 00:15:20 | The outcome:pictures and predictions! |
| 00:16:15 | Settling/sedimentation: settling time, t a d2 |
| 00:17:50 | Perry’s short cut (3rd Edition, 1950: page 937)For 100 nm material in water |
| 00:18:49 | ASTM E2490-09 (now -15) |
| 00:19:43 | Preparation of metal colloids |
| 00:21:05 | Adhesion forces - dry millingTheoretical limit of a ball mill |
| 00:21:47 | Untitled |
| 00:22:33 | Drexler & Rucker |
| 00:23:17 | K. Eric Drexler |
| 00:24:20 | So we really need to do it in the wet… |
| 00:25:50 | Ball Mill – Fischer: Colloidal Dispersions |
| 00:26:38 | Colloid Mill US Patent 1,500,845 (July 8th, 1924) |
| 00:27:09 | High energy input to break solids |
| 00:27:52 | And a lot of time…. |
| 00:28:18 | Slide34 |
| 00:28:18 | Good for non-aqueous too… |
| 00:29:01 | Untitled |
| 00:29:20 | Decomposition of appropriate precursors in liquid |
| 00:30:42 | Patents old and new – 1915 & 2004 |
| 00:31:05 | Atomization |
| 00:31:42 | Reduction processes |
| 00:34:09 | John Turkevich – colloidal gold mainly |
| 00:34:27 | Turkevich – Gold Bulletin (1985 articles) |
| 00:34:41 | PhD Thesis: Victor Elias Torres Heredia Universidad Politécnica de Catalunya November 2011 |
| 00:35:10 | Stabilization |
| 00:35:43 | Stabilization – early literature |
| 00:36:10 | Steric stabilization |
| 00:36:34 | Gold number (Zsigmondy) |
| 00:37:04 | Characterization (of metal colloids) |
| 00:37:55 | Ask Google |
| 00:38:03 | Made Right |
| 00:38:10 | Techniques |
| 00:39:52 | Surface |
| 00:41:10 | Size |
| 00:41:46 | Shape & constitution |
| 00:43:12 | But what do they do? Applications |
| 00:43:39 | 3-way autocatalysts |
| 00:44:42 | Au colloids for medical applications |
| 00:45:20 | Hmmm… |
| 00:45:43 | RM 801x |
| 00:46:25 | The correlograms for the (3) Au colloidsRM 8011/8012/8013 |
| 00:46:40 | DLS studies of RM 8011, 8012, & 8013 |
| 00:47:01 | General references |
| 00:47:27 | Some relevant webinar references |
| 00:47:46 | Thank you! |
| 00:48:04 | Thank you for your attentionAny questions? |
| 00:49:11 | Contact Information |
Metal colloids represent a very interesting system known since
Roman times (the Lycurgus Cup). We'll look at the preparation of
these systems looking mainly at gold, silver, and the platinum
group metals. All these find extensive application in industries
including drug delivery (Au), disinfection (Ag), catalysis (all the
aforementioned), and margarine production (Ni). We'll note that
Mie theory was specifically developed to explain the color of gold
colloids.