| 5 | 1/1 | 返回列表 |
| 查看: 1109 | 回復: 5 | |||
| 當前只顯示滿足指定條件的回帖,點擊這里查看本話題的所有回帖 | |||
beijingliu金蟲 (正式寫手)
|
[交流]
【求助】teos制備溶膠時的ph 已有5人參與
|
||
|
各位: 我想用溶膠凝膠法制備催化劑,酸性催化劑,活性組分為雜多酸,選用二氧化硅為載體,想用teos制備,想問一下大家:制備步驟,還有各種物質(zhì)的加入量是多少?成膠的ph是多少?謝謝! |
金蟲 (正式寫手)
木蟲 (小有名氣)
榮譽版主 (文壇精英)
Excellent
| Use of amphiphilic triblock copolymers to direct the organization of polymerizing silica species has resulted in the preparation of well-ordered hexagonal mesoporous silica structures (SBA-15) with uniform pore sizes up to approximately 300 angstroms. The SBA-15 materials are synthesized in acidic media to produce highly ordered, two-dimensional hexagonal (space group p6mm) silica-block copolymer mesophases. Calcination at 500°C gives porous structures with unusually large interlattice d spacings of 74.5 to 320 angstroms between the (100) planes, pore sizes from 46 to 300 angstroms, pore volume fractions up to 0.85, and silica wall thicknesses of 31 to 64 angstroms. SBA-15 can be readily prepared over a wide range of uniform pore sizes and pore wall thicknesses at low temperature (35° to 80°C), using a variety of poly(alkylene oxide) triblock copolymers and by the addition of cosolvent organic molecules. The block copolymer species can be recovered for reuse by solvent extraction with ethanol or removed by heating at 140°C for 3 hours, in both cases, yielding a product that is thermally stable in boiling water. |
| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|
|
[考研] 【求調(diào)劑】新能源材料本科,一志愿211,初試321 +3 | 求調(diào)劑學校, 2026-04-02 | 3/150 |
|
|---|---|---|---|---|
|
[考研] 349求調(diào)劑 +6 | 吃的不少 2026-04-01 | 6/300 |
|
|
[考研] 330分求調(diào)劑 +11 | qzenlc 2026-03-29 | 11/550 |
|
|
[考研] 生物學296求調(diào)劑 +10 | 湯圓包 2026-03-29 | 14/700 |
|
|
[考研] 0855機械初試280求調(diào)劑 +3 | kazenotori 2026-03-31 | 3/150 |
|
|
[考研] 求0861交通運輸專碩or材料專碩調(diào)劑 +4 | 勒布朗@ 2026-03-31 | 4/200 |
|
|
[考研] 求調(diào)劑,一志愿北林食品與營養(yǎng)095500,301分,已過六級,有科研經(jīng)歷 +4 | 快樂儲蓄罐 2026-03-31 | 4/200 |
|
|
[考研] 材料工程085601數(shù)二英一335求調(diào)劑 +5 | 雙馬尾痞老板2 2026-03-31 | 5/250 |
|
|
[考研] 材料工程專碩求調(diào)劑 +10 | hyl3153942 2026-03-29 | 10/500 |
|
|
[考研] 367求調(diào)劑 +7 | 芋泥啵啵… 2026-03-28 | 7/350 |
|
|
[考研] 本科211生物醫(yī)學工程085409求調(diào)劑339分 +7 | 里子木yy 2026-03-29 | 7/350 |
|
|
[考研] 081200-11408-276學碩求調(diào)劑 +4 | 崔wj 2026-03-31 | 4/200 |
|
|
[考研] 266求調(diào)劑 +3 | 哇呼哼呼哼 2026-03-29 | 3/150 |
|
|
[考研] 11408總分309,一志愿東南大學求調(diào)劑,不挑專業(yè) +5 | 天賦帶到THU 2026-03-29 | 6/300 |
|
|
[考研] 0703 化學 求調(diào)劑,一志愿山東大學 342 分 +7 | Shern—- 2026-03-28 | 7/350 |
|
|
[考研] 085602 化學工程專碩 340分求調(diào)劑 +4 | qianbai11 2026-03-29 | 4/200 |
|
|
[考研] 070305高分子化學與物理 304分求調(diào)劑 +12 | c297914 2026-03-28 | 12/600 |
|
|
[考研] 調(diào)劑考研 +3 | 王杰一 2026-03-29 | 3/150 |
|
|
[考研] 復試調(diào)劑,一志愿南農(nóng)083200食品科學與工程 +5 | XQTJZ 2026-03-26 | 5/250 |
|
|
[考研] 打過很多競賽,085406控制工程300分,求調(diào)劑 +3 | askeladz 2026-03-26 | 3/150 |
|