| 5 | 1/1 | 返回列表 |
| 查看: 1108 | 回復(fù): 5 | |||
| 當(dāng)前只顯示滿足指定條件的回帖,點(diǎn)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! |
木蟲 (小有名氣)
金蟲 (正式寫手)
榮譽(yù)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] 304求調(diào)劑 +12 | 素年祭語 2026-03-31 | 15/750 |
|
|---|---|---|---|---|
|
[考研] 0710生物學(xué)求調(diào)劑 +6 | manman511 2026-04-01 | 6/300 |
|
|
[考研] 070300化學(xué)279求調(diào)劑 +15 | 哈哈哈^_^ 2026-03-31 | 17/850 |
|
|
[考研] 266分求材料化工冶金礦業(yè)等專業(yè)的調(diào)劑 +7 | 哇呼哼呼哼 2026-03-26 | 7/350 |
|
|
[考研] 379求調(diào)劑 +3 | ?苦瓜不苦 2026-04-01 | 3/150 |
|
|
[考研] 085600,320分求調(diào)劑 +5 | 大饞小子 2026-04-01 | 6/300 |
|
|
[考研] 化學(xué)0703 調(diào)劑 306分 一志愿211 +12 | 26要上岸 2026-03-28 | 12/600 |
|
|
[考研] 求0861交通運(yùn)輸專碩or材料專碩調(diào)劑 +4 | 勒布朗@ 2026-03-31 | 4/200 |
|
|
[考研] 土木304求調(diào)劑 +5 | 兔突突突, 2026-03-31 | 6/300 |
|
|
[考研] 一志愿南師大0703化學(xué) 275求調(diào)劑 +5 | Ripcord上岸 2026-03-27 | 5/250 |
|
|
[考研] 070300化學(xué)354求調(diào)劑 +15 | 101次希望 2026-03-28 | 15/750 |
|
|
[考研] 江蘇蘇北高校誠邀調(diào)劑同學(xué) +3 | zzll406 2026-03-31 | 3/150 |
|
|
[考研] 322求調(diào)劑:一志愿湖南大學(xué) 材料與化工(085600),已過六級。 +10 | XX小鄧 2026-03-29 | 10/500 |
|
|
[考研] 083000環(huán)境科學(xué)與工程調(diào)劑,總分281 +4 | 橙子(勝意) 2026-03-30 | 4/200 |
|
|
[考研] 哈爾濱工業(yè)大學(xué)材料與化工專碩378求調(diào)劑 +3 | 塔比烏斯 2026-03-30 | 3/150 |
|
|
[考研] 348求調(diào)劑 +6 | 小懶蟲不懶了 2026-03-28 | 6/300 |
|
|
[考研] 一志愿北京工業(yè)大學(xué),324分求調(diào)劑 +6 | 零八# 2026-03-28 | 6/300 |
|
|
[碩博家園] 招收生物學(xué)/細(xì)胞生物學(xué)調(diào)劑 +4 | IceGuo 2026-03-26 | 5/250 |
|
|
[考研] 330一志愿中國海洋大學(xué) 化學(xué)工程 085602 有讀博意愿 求調(diào)劑 +3 | wywy.. 2026-03-27 | 4/200 |
|
|
[考研] 一志愿上海理工能源動力(085800)310分求調(diào)劑 +3 | zhangmingc 2026-03-27 | 4/200 |
|