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關於lah chemical 在 Chetapotpet Fans Makeup Lovers Facebook 的精選貼文
關於lah chemical 在 Rumah Jamu Cosmetic Facebook 的精選貼文
關於lah chemical 在 Pai Syahira Facebook 的最佳解答

關於lah chemical 在 NgektsaiArmy Official Youtube 的最讚貼文

關於lah chemical 在 Re: [實驗] LiAlH4 (LAH) THF溶液配製請益- 看板Chemistry 的評價
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lah chemical 在 Chetapotpet Fans Makeup Lovers Facebook 的精選貼文

2021-02-03 02:02:54 有 322 人按讚

Test Krim Jeragat Khas + Whitening Boost jugak untuk fast result ..no chemical ...comingsoon ..
Box Exclusive Golden Box tu tadi cheta live + Whitening Toner Tox + Rubmask Papaya Face scrub puas tu x terkata SPA DIRUMAH JER...

Kalau ada yg tanya bila krim jeragat released insyallah sblum tgh bulan Feb ni😉 ok...cheta keluarkan krim jeragat ni sebab saya keturunan yg memang jeragat cepat naik dimuka ..erm pernah ke org niaga terus terang mcm saya😂yerlah kita jual Skin Care kan awak....nama pun Skin Care " Penjagaan Kulit"
Guna Secret Desire Skin Care & Cosmetic ni untuk mengelakkan kulit bermasalah memastikan kukit mendapat nutrisi keperluan kulit dgn Kombinasi Campuran Ingredient2 yg sangat berkesan ha..ni lah penting!

Jangan guna nama skin care tapi hanya Chemical Care🤣tau!!

Nite semua insyaallah esok saya back ontrack makeup setiap malam ok😘😘😘😘ramai dah rindu chetapotpet 😍😍

#chetapotpet #skincare #cosmetic #merawat #mencerahkan

Tags: lah chemical chetapotpet skincare cosmetic merawat mencerahkan

Chetapotpet Fans Makeup Lovers

About author

Makeup Lovers� and care about skin�

lah chemical 在 Rumah Jamu Cosmetic Facebook 的精選貼文

By Rumah Jamu Cosmetic

2020-11-10 21:29:11 有 13 人按讚

SEBELUM NI SUAMI TAK PERNAH PUJI, TAPI KALI NI SAYA RASA LEBIH DIHARGAI..

Saya seorang isteri mencecah 40an, anak kami 3 org, bekerja sepenuh masa. Sebab terlalu sibuk, saya terlupa dengan layanan pada suami saya..

“PANDAI SYG JAGA ABANG..”

Itulah ayat yang mula2 dia ucapkan. Ye lah, saya pelik lah sebelum ni dia tak pernah puji macam tu sambil berikan pelukan dan ciuman.

Tapi saya perasan dia mula ucapkan kata2 cinta dan pujian lepas beberapa hari saya pakai serum ni. Saya tak boleh makan jamu atas faktor kesihatan, tapi serum ni lain, sebab dia direct ke cik bunga. Saya yakin selamat sebab:

1. Ada pengiktirafan SIRIM bebas dari bahaya
2. Ada kelulusan dari Makmal Bertauliah bebas chemical
3. ORGANIK

Selepas saya amalkan BAKIRA SERUM dari Rumah Jamu Cosmetic, hari demi hari saya rasai perubahannya seperti;

1- Sempit dari bibir hingga bahagian dalam
2- Lendir putih-kuning-coklat/ bau & gatal hilang serta merta
3- Semakin c4ntik, anjal, pink dan tiada kedutan

Saya pernah juga nampak pasal produk BAKIRA tu tapi biasa lah sy tak percaya. Ini dah ada hasil depan mata, sy sendiri rasa, Confirm saya akn teruskan pemakaian sebab setakat ni, ini yang sangat berkesan dan selamat.

Saya sarankan kepada semua wanita yang seperti saya, untuk cuba BAKIRA SERUM dari Rumah Jamu Cosmetic, sgt berbaloi dan berkesan. Lagipun sekarang ada promosi;

1. Promosi Bakira Trial Cinta Edition
2. Promosi Bakira Gold FREE Bakira Wash

Kalau beli antara satu ni, boleh dapat cincin emas 916! Mudah saja, kalau nak dapatkan produk ni, klik je link di bio profile.
.
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#ainursquad #usahawanrumahjamu #rumahjamucosmetic #rumahjamumalaysia #bakiraserum #bakiracintaedition #sisviral #wecintayou #thaipusam2020 #salesalesale #serumorganik #perapatvagina #bazaarpaknil #bazarpaknilmurah #Malaysian
#BajuKurung
#Mantap
#BazaarMalaysia
#IGMalaysia
#TudungMurah
#PutihGebu
#NakKurus
#mekdi
#Meletop
#Kahwin
#MalaysianFood
#SayaJualMurah
#TudungBawal
#tudung #onlineshopping @sisviral_bakirahq @rumahjamucosmetichq

Tags: lah chemical ainursquad usahawanrumahjamu rumahjamucosmetic rumahjamumalaysia bakiraserum bakiracintaedition sisviral wecintayou thaipusam2020 salesalesale serumorganik perapatvagina bazaarpaknil bazarpaknilmurah Malaysian BajuKurung Mantap BazaarMalaysia IGMalaysia TudungMurah PutihGebu NakKurus mekdi Meletop Kahwin MalaysianFood SayaJualMurah TudungBawal tudung onlineshopping

Rumah Jamu Cosmetic

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Rumah Jamu Cosmetic secara rasminya ditubuhkan pada 20 Jun 2019. Ketika ini Rumah Jamu Cosmetic berdiri hanya berbekalkan keazaman dan keyakinan bahawa apa yang kami usahakan ini mampu memberi manfaat kepada ramai golongan wanita. HIGHLIGHTS SIRIM dan KKM telah mengesahkan Bakira Serum selamat digunakan tidak mengandungi mikroorganisma berbahaya untuk Miss V. MISI Membantu wanita untuk mendapatkan keyakinan diri dan berpeluang untuk menjana pendapatan bersama Rumah Jamu Cosmetic.

Kecantikan Intimasi sama pentingnya dengan cantik luaran. Wanita seawal baligh wajib dididik menjaga dan merapikan keindahan intimasi demi kebersihan, keyakinan, kesejahteraan dan kebahagian diri. Dapatkan produk kami yang telah terbukti secara klinikal.

lah chemical 在 Pai Syahira Facebook 的最佳解答

By Pai Syahira

2020-10-18 01:24:59 有 1 人按讚

~ KETAHUI KEGUNAAN SEBENAR 6 JENIS UBAT KRIM DI PASARAN ~

Saya kongsikan secara mudah, tentang jenis jenis ubat krim yang anda biasa dapat kalau jumpa doktor atau pergi farmasi.

Krim-krim ini pula sebenarnya disediakan oleh syarikat ubat dalam beberapa persediaan. Kita panggil 'krim', tapi ada beberapa persediaan krim ini, iaitu:

1. OINTMENT : Ianya oil-based. Sebab ia asas minyak, maka ia melekat lebih bagus (lama) pada kulit, dan lebih kuat kesannya pada kulit (more potent). Kita gunakan 'krim' jenis ointment ini pada kawasan kulit yang dah menebal dan kasar sebab kesan selalu garu dan bergesel (lichenified skin area). Rujuk gambar utk faham kulit yang sudah lichenified.

2. CREAM : Ianya water-based. Sebab ia asas air, ia kurang potent berbanding ointment. Kita sapu cream ini di kawasan yang less lichenified atau kawasan kulit sensitif seperti kulit muka.

3. LOTION / GEL : Kita sapu krim asas lotion / gel ini pada kawasan yang berbulu , juga di kawasan lipatan (intertriginious area) seperti kawasan ketiak, kelengkang, kawasan anus atau kemaluan, di bawah lipatan breast.

Jadi, bila dapat 'krim', tengok persediaannya, adakah ianya cream, ointment atau lotion.

------------------------------------------------------------------------------------------
Senarai 6 jenis krim untuk kulit yang terdapat di farmasi:
------------------------------------------------------------------------------------------

1. Steriod Cream (Nama saintifik berakhir dengan " SONE")

Secara umumnya digunakan untuk merawat keradangan (inflammation) pada kulit. Contoh paling tipikal untuk merawat eczema. Bagaimana nak tahu steroid cream?

Perhatikan nama saintifik cream itu (bukan brand name). Nama saintifiknya berakhir dengan " SONE". Contoh: Hydrocortisone, Clobetasone, Mometasone, Fluticasone, Betamethasone.

Krim steroid ini ada kelasnya. Kelas satu paling kurang power, dan makin tinggi kelas, makin power (potent) lah ia. Rujuk gambar untuk kenali kelas-kelas krim steroid ini. Tak boleh semberono korang tepek steroid krim tanpa tahu kelas. Sebabnya? Utk kelas yg potency tinggi, tak sesuai di sapu di kawasan yg sensitif seperti kulit muka /kawasan kulit yg dah menipis. Nanti kuli dpt komplikasi.

Krim-krim steroid juga secara umumnya tak boleh disapu secara berterusan untuk terlalu lama. Lama tu maksudnya lebih 2 minggu. Untuk kes-kes allergic /eczema yang kronik, doktor mungkin mulakan rawatan steroid cream/ ointment guna kelas paling potent untuk 5 hari, kemudian diikuti dengan yang less potent untuk seminggu berikutnya.

Apa komplikasi tepek steroid cream terlalu lama (prolonged used on skin)? Antaranya kulit akan menipis, rosak (atrophy), kulit hilang pigmen (hypopigmentation), kulit itu jadi alah pula pada krim yang disapu (allergic reaction), meninggikan risiko jangkitan (infection), dan kalau di sapu di kawasan yang besar, ada risiko sapuan krim steroid luaran itu diserap dalam badan (systemic absorption).

2. Anti-fungal Cream (Nama saintifik berakhir dengan "ZOLE")

Kita gunakan untuk rawat jangkitan fungus (kulat). Jangkitan kulat ni orang Melayu panggil kurap / kulat air. Panau itu pun sebenarnya ialah jangkitan kulat. Bagaimana nak kenal anti fungal cream?

Perhatikan nama saintifik cream itu, berakhir dengan "ZOLE". Contoh: Miconazole, Clotrimazole, Econazole, Ketoconazole, Fluconazole.
Dan ada satu jenis anti-fungal krim yg nama saintifiknya Terbinafine (brand name Lamisil).

3. Antibiotic Cream (Nama saintifik kebanyakannya berakhir dengan "IN")

Kita gunakan untuk rawat jangkitan bakteria pada kulit. Ada pelbagai jenis jangkitan bakteria, dan pelbagai rupanya. So biarlah kerja men'diagnosed' itu doktor yang buat. Penat dia belajar, korang tak payah susah-payah main agak-agak tengok imej Google. :P

Bukan apa, skin condition ni perlukan ilmu dan latihan mata yang tajam. Doktor yang berpengalaman pun kadangkala buat silap masa diagnose.

Bagaimana nak kenal antibiotic krim? Perhatikan nama saintifik cream itu, kebanyakannya berakhir dengan " IN". Contohnya: Gentamicin, Fucidin, Neomycin, Mupirocin.

4. Combination of cream

Krim dalam jenis keempat ini ialah kombinasi antara 3 jenis krim di atas. Contoh kombinasi yang biasa kita jumpa:

1. Steroid cream + Antibiotic cream
2. Anti-fungal cream + Steroid cream

Bila kita perlu guna krim 2 in 1 ini?
Or sometimes ada yang 3 in 1 (kombinasi antibiotic + steroid + anti fungal).
Rujuk gambar untuk contoh.

Bila ada komplikasi dari jangkitan asal. Contohnya kita kena kurap (fungal infection). Kita garu dan garu, punya syok garu sampai luka kulit. Kuku kita bukan sterile, bawah kuku banyak bakteria. Lepas seminggu kurap kita luka, kurap kita dapat jangkitan bakteria. So dalam kes ini, kita guna krim anti-fungal + antibiotic/steroid.

Ataupun kita ada eczema yang kronik. Garu punya garu sampai luka lepas itu infected. So kita kena sapu krim steroid + antibiotic.

5. Anti-virus Cream

Krim jenis ni untuk jangkitan virus. Paling mudah nak faham, kalau kena chicken pox atau kayap. Kedua-dua penyakit ini disebabkan oleh jangkitan virus. Selain kena ambik ubat oral, sapuan krim anti-virus pun perlu.

Sebab jarang krim ini digunakan secara meluas (berbanding 4 jenis krim di atas), maka saya tak menulis dengan lanjut tentang krim anti-virus ini.

6. Moisturising Cream

Okay, krim ini sangat-sangat penting. Walaupun ianya hanyalah krim pelembab, namun ia memainkan peranan penting dalam rawatan.

Contoh paling klasik ialah pesakit chronic eczema. Kulit pesakit eczema akan kering. Kering sebab cycle penyakit itu sendiri, kering sebab kesan sapu ubat steroid. Kulit yang kering akan gatal. Jadinya, perlu sapu krim pelembab setiap hari. Krim pelembab boleh disapu setiap hari untuk tempoh yg lama, Insya Allah no problem (tak macam krim steroid).

Kita sarankan untuk mereka yang ada eczema, sapu lah krim pelembab setiap malam sebelum tidur. Boleh juga dicampur dengan steroid cream dalam nisbah tertentu (50%-50%, 60%-40%, etc) bergantung pada rawatan doktor.

Krim pelembab yang bagus antaranya brand Cetaphil. Cetaphil ini juga ada dalam bentuk mandian. Cakap pasal mandi, untuk orang yang kulitnya ada eczema/sensitive skin, hati-hati guna sabun mandi yang berubat. Contohnya Dettol atau Protex, sebab chemical dari sabun-sabun ini boleh membuang lapisan minyak dan lemak pada kulit, so end up kulit akan kering. So gunakan mandian yang ada moisturizer macam Cetaphil atau Dove.

Untuk kulit yang super sensitive juga, kita advised untuk jangan lap badan terlalu kuat dengan towel. Tinggalkan sikit basah-basah/kelembapan pada kawasan kulit terlibat, dan selepas itu sapu krim pelembab untuk maintain kelembapan area terbabit.

So, please kenal krim yang anda gunakan. Jangan kenal krim based on color. Contohnya, " Saya nak krim warna putih tu ". Hampir semua krim warna putih! Ataupun beli krim yang TIADA LABEL.

Zaman dulu ya doktor/farmasi re-pack krim dalam bekas bulat leper. Zaman sekarang, make sure beli krim yang dalam bentuk tiub macam ubat gigi tu. Kalau re-pack sekalipun, anda berhak tahu kandungan krim itu (mesti ada label).

Jangan main hentam sapu krim orang lain kat badan anda. Orang tu "serasi " sapu krim tu, awak pun tepek kat badan awak. Padahal orang tu ada eczema, tapi awak ada kurap.

Again, jangan berguru dengan imej di Google semata-mata.

Credit to Dr Khairul Faizie Mohammad Kamar

Tags: lah chemical

Pai Syahira

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Ibu | Anak | Isteri | Hamba Allah | Sahabat

Aktivis Kemanusiaan | Wartawan | Usahawan Founder Pai Al Amin Centre

lah chemical 在 NgektsaiArmy Official Youtube 的最讚貼文

By NgektsaiArmy Official

2018-12-24 20:13:59 有 33,897 人看過有 944 人喜歡

Salam perey! ?
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Kongsikan Kopi Hijau Chia Seed Plus dengan semua org! Harga RM65 jak termasok postage. Boleh nyuroh ktk org rasa kenyang berpenjangan, jadi boleh kurus tauk sik! Kontek nombo di debah!
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www.wasap.my/60138037385
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KELEBIHAN CHOMEL KOPI HIJAU CHIA SEED PLUS
?Menstabilkan metabolisma dlm bdn
?Bdn akn lebih bertenaga dan dpt melangsingkan bdn bg org yg gemuk
?org yg kurus menstabilkan metabolisma dlm badan
?tiada bahan chemical dan kandungan semula jadi
?Antara mknn sunnah berdasarkan pemakanan nabi antaranya kurma, kismis, madu, zaitun, habbatussauda, buah tin
?mengandungi vitamin c dan collagen untuk kulis lebih gebu dan boleh memutihkan kulit
?kopi ni xpahit mcm kopi lain..lemak2 manis dan molek untuk org sakit lenguh2 urat tuh..
.
Its the time of the year! Merry Christmas to everybody! Di Sarawak time tok memang dah hangat dengan kehangatan Krismas! Biasalah dah nama Sarawak, bukan setakat bumiputra jak meraikan perayaan tok malah ada bangsa2 lain juak meraikannya. Ekk pelik ka? Sik la, di Sarawak banyak org kawen berlainan bangsa. Ada Melayu kawen Iban, ada Cina kawen Bidayuh, so bila musim perayaan mcm tok, semua sekali meraikannya!
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Apapun, pesanan Ngektsai agar bersedekah lah. Sik kisah agama apa, bangsa apa, semua nya mengajar kita utk bersedekah atau berkongsi rezeki. Dengan itu, rezeki akan lebih melimpah ruah! Lebih2 gik musim Xmas tok, org di opis bertukar2 hadiah, sik kisah mahal sik janji ikhlas n termampu! Sik guna mun kita kaya harta tapi kita miskin sifat pemurah. ?
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Okay Christmas eve tok Ngektsai nak spend masa mcm biasa tiap taun nangga movie Christmas. All time fav adalah Home Alone! Hahaha! Kongsikan rasa ktk org pada musim perayaan Christmas, tag kawan2 atau keluarga dan share ucapan anda! Merry Christmas Ngektsai Army!
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#ngek
#ngektsai
#ngektsaiarmy

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社群媒體上有些相關的討論：

lah chemical 在 Re: [實驗] LiAlH4 (LAH) THF溶液配製請益- 看板Chemistry 的必吃

作者kdjf (我抓得到什麼呢?)

看板Chemistry

標題Re: [實驗] LiAlH4 (LAH) THF溶液配製請益

時間Sun Aug 8 19:57:59 2021

: 各位神人大家好～
: 目前我正在配LAH的THF溶液來測試材料產氫的效果，但是完全看不到產氫峰出現QQ
:
: 有點懷疑是LAH溶液配製方法不對，因為
: 1. 配完後跟Sigma上面賣的形容 ( cloudy and colorless)的很不一樣，我的配完則是灰色
: 混濁的
: 2. LAH倒入THF時有很多泡泡產生（失氫？

: 推 kdjf: 你的THF的除水等級到哪裡? 08/07 07:32
: → kdjf: 然後"在手套箱打開瓶子交換掉裡面的空氣"是正常操作嗎@@? 08/07 07:52
: 除水等級不太確定欸，不過之前學長有用他來配LiBH4，且反應正常，不過不排除放了一陣
: 子吸水的可能，或是LBH對水敏感度沒LAH那麼高（？
BH4的部分... 你知道他可以在水相下反應嗎?
千萬不要用BH4的態度處理LAH, 這東西在hood裡沾在紙上拿出來,
狀況剛好的話甚至會著火的, 只少在空氣下的燒杯中放幾小時, 絕對不要直接丟垃圾桶

:
: 交換空氣算是不得已的作法啦xd 畢竟THF是在外面裝的，只能打開盡量讓他成為Ar 環境
首先, 如果是買來的一般合成THF裡面, 通常有1%, 多一點甚至3%的水
如果要少一點, 至少要買到LC用的, 正常實驗室上溶劑儲水系統的很多直接HPLC級

沒有的話, 要從氧化鈣開始蒸第一次, 再用CaH2 or Na or 高強度乾燥過的分子篩乾燥第二輪

或者少量的話, 有無水的THF, 瓶子打開瓶口是膠膜, 用針抽的
使用方法是先拿氣體針插進去幾秒給他內部壓力(這時可以看到膠膜稍微鼓起)
再用針筒抽出想要的量, 拔出抽取的針後(很重要一定要先拔出)再用氣體針加壓到稍微鼓起
接著用不會留殘膠的膠帶把戳針的洞口貼起來

: 目前操作手法如下，想知道哪邊有問題Q
: 1. 在hood下裝入15 mL THF在血清瓶中
用一隻長針穿過血清塞, 經過瓶口插到瓶底, 過個大概瓶子體積兩三倍的Ar
(N2的話我會灌10倍)
接著在還在吹氣的狀況下塞好血清塞並迅速拔掉Ar針以免瓶內壓力太高

: 2. 進入手套箱前在轉換箱抽真空去除水氧五分鐘再進入手套箱（純Ar 環境）
: *進入的物品有刮勺、密封的THF血清瓶
: 3. 進入手套箱後打開血清瓶使其充滿Ar
這時就不太會汙染內部氣體了

: 4. 在秤量紙上裝50mg LAH後直接一次倒入THF中
: 5. 密封後拿出手套箱超音波震盪一小時
: *以上皆在室溫（25-30度）進行
:
: 目前想到的可能是因為LAH溶解好像是強放熱反應，所以可能THF要冰浴過且LAH要分批加入
除水道位的話到少量(0.5克以下)又在無氧環境, 基本上沒啥好擔心的
: ，而非一次all in（？？？
:
: —>不過有個好奇的點是，LAH熱裂解至少快200度，會因為溶解放熱就分解嗎？
THF下的LAH容易分解的多, 不過反正在THF下, 不會有大範圍超過60度的機會

: --
: ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 110.26.227.59 (臺灣)
: ※ 文章網址: https://www.ptt.cc/bbs/Chemistry/M.1628280705.A.D94.html
: ※ 編輯: sea1313812 (110.26.227.59 臺灣), 08/07/2021 04:31:07
: 推 grass30630: 我以前在冰浴下配LAH溶液也還是灰色濁狀的... 08/07 09:39
: 只能說sigma能把他拿出來賣還是有原因的xd
: → bittywind: 單看敘述感覺THF不夠dry，有過除水系統或者蒸餾過嗎 08/07 12:03
: 沒有Q 櫃子打開就直接用了（掩面
: 推 hept: THF除水不足,LAH多少會死掉就不溶, 08/07 12:46
: → hept: 可以再配製後在ＢＯＸ中用過濾版過濾一次 08/07 12:47
: → hept: 血清瓶進ＢＯＸ前先在烘箱烤一下再趁熱進ＢＯＸ 08/07 12:48
: 好的～感謝建議～
: → i19890813: THF須經蒸餾或溶劑純化裝置除水並保存於氮氣環境下 08/07 16:14
: → i19890813: 避免接觸到空氣中的水氣，手套箱的chamber沒有除溶劑水 08/07 16:15
: → i19890813: 氧的功能一加LAH會劇烈冒泡就是因為THF含水量不夠低 08/07 16:16
有除水除氧的手套箱, 維護費嚇人

: 目前討論的結果感覺應該是含水量不夠低，之後有成功的話應該會放一些在手套箱裡
我是不會放回手套箱保存啦... 操作正確的話頂多乾燥箱就很夠了

: 推 a210510: 一般用LAH就算溶液是灰色渾濁還是會有反應吧…… 08/07 16:19
: 對…我剛跟台大的同學討論也是這樣，而且他的劑量還比我少
: → i19890813: 只有50mg一次加沒什麼問題應該就是THF不夠dry 08/07 18:36
: 推 xxxx85214: 應該是THF不夠dry 08/07 19:15
: → xxxx85214: THF 先加活化過的分子篩就可以把大部分的水氣除掉了 08/07 19:15
高度除水的話分子篩只能吸重量0.02倍的水, 要是從2%開始除, 得加1/3瓶...
不過50mg/15ml的LAH應該不用除的那麼嚴格

: 感謝建議！目前應該是採這個方法，實驗室比較可行（沒錢
: → faniour: 只希望你知道你在接觸的是一定程度危險性的東西 08/07 21:46
: 好的～感謝提醒～
真的危險, 尤其如果是剛買來的

: 推 Alcor: 以你文中所敘述的操作手法感覺你們手套箱種水應該不少... 08/08 02:47
: → wayne121212: 在手套箱裡打開瓶子放氧氣出來不會讓氧值爆噴嗎... 08/08 02:48
: 就之前的結果來看是沒有（萬幸
: → wayne121212: 你們Lab有錢養手套箱難道沒有真空系統嗎@@ 08/08 02:49
: → wayne121212: 正常操作應該是先用真空系統換惰氣->針筒打THF->才 08/08 02:55
: → wayne121212: 送進手套箱吧 08/08 02:55
: 您的意思是THF存於Ar環境，要用再使用針筒取的意思嗎？可是這樣裝的容器也還會有外面
: 的大氣，而且如果打開瓶蓋一起抽THF會被抽掉的
用真空系統把一開始的瓶子灌滿惰氣, 進手套箱取LAH拿出,
再用針筒從乾燥好的THF瓶轉移THF進去
(一開始要用力打快一點, 馬上讓THF蓋過LAH, 這手法大概可用到0.1g LAH, 超過就不行)

--

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推 sea1313812:

08/08 21:40

→ kdjf: 加壓補氣的針最好不要跟抽取的針同時插，一不小心氣壓可能把 08/08 22:56

→ kdjf: 抽取針整個活塞噴出去，除非你的氣體針是可控壓力的或者接在 08/08 22:56

→ kdjf: schlenk line上。補氣時補到有一點點鼓起就停下來 08/08 22:56

→ kdjf: 可以丟一大堆分子篩下去，120度以上一般大氣烘箱烘過的，加 08/08 23:07

→ kdjf: 個50ml體積分子篩去除60ml THF，加減能除水到100ppm，15ml T 08/08 23:07

→ kdjf: HF中剩1.x mg水，對50mg LAH來說勉強夠乾 08/08 23:07

→ kdjf: 如果THF還沒辦法弄好，先不要打乙醚的主義，比較不吸水但沸 08/08 23:09

→ kdjf: 點太低更吃操作技巧 08/08 23:09

→ kdjf: 你提的步驟算是可接受，要小心的是當你把不知道除水程度的TH 08/08 23:17

→ kdjf: F打入時，最多可產生接近100ml的氫。打THF的針頭一定要在液 08/08 23:17

→ kdjf: 面上免得溶有LAH的液體倒灌甚至噴出，至少要護目鏡戴好在hoo 08/08 23:17

→ kdjf: d中操作。當然如果你的溶劑確定夠乾，操作風險就小很多。 08/08 23:17

推 xxxx85214: 我用分子篩的話是先取大量 08/09 01:38

→ xxxx85214: 200度在真空下除水隔夜 08/09 01:38

→ xxxx85214: 之後儲存在乾燥箱 08/09 01:38

→ xxxx85214: 使用前會再用噴槍在真空下烤個幾次 08/09 01:38

→ xxxx85214: 有文獻指出用10% (m/v)的分子篩放置一天 08/09 01:38

→ xxxx85214: 可以從100ppm到30ppm左右 08/09 01:38

→ xxxx85214: 但還是要看你原本溶劑的含水量 08/09 01:39

→ xxxx85214: 來決定要加多少 08/09 01:39

→ kdjf: 正常分子篩是高真空烤至少隔夜，好好處理可以弄到個位數ppm 08/09 08:14

→ kdjf: ，有文獻指出甚至比活性金屬煮一天還乾。是說好像不少人使用 08/09 08:14

→ kdjf: 前會再烤一下，是想要脫附什麼東西讓他活化嗎？ 08/09 08:14

推 xxxx85214: 應該是存放在乾燥箱久了還是有些許水氣 08/09 12:14

→ xxxx85214: 而且拿出來秤時也是會接觸空氣 08/09 12:14

→ xxxx85214: 所以使用前一樣用熱跟真空去除掉內部的水氣比較保險 08/09 12:14

→ kdjf: 了解，我是都逆流氮氣下操作 08/09 13:52

→ kdjf: 放一個月的也還夠用 08/09 13:52

推 sea1313812: 感謝各位！另外我想問一下有些THF內會加BHT，想問一 08/09 15:13

→ sea1313812: 下有需要去除嗎？ 08/09 15:13

→ faniour: BHT以前因為THF不是LAH除水就是Na除水 08/09 15:33

→ faniour: 會順便清掉，現在似乎是過管柱去除 08/09 15:33

推 sea1313812: 原來會被反應掉嗎…難怪直接配會一直死 08/09 15:35

→ kdjf: 1mM的BHT以你的需求(87mM LiAlH4)來說我是會忽略，等需要極 08/09 18:23

→ kdjf: 高精度時再處理 08/09 18:23

推 sea1313812: 了解，主要問題還是THF不夠dry的緣故 08/09 20:18

推 evanzxcv: 除水方面，文獻指出分子篩其實比Na/benzophenone更好用 08/10 09:14

→ evanzxcv: 而且安全多了，不過使用前要先活化(真空烤200度，無真空 08/10 09:14

→ evanzxcv: 至少要300度) 08/10 09:14

→ evanzxcv: 活化過能在150度烘箱放多久就比較難講，畢竟這也跟你烘 08/10 09:15

→ evanzxcv: 箱裡放的其他東西有關 08/10 09:15

→ kdjf: Na/Ph2CO的好處是起始溶劑含水<0.5%就差不多夠用，分子篩 ( 08/10 13:26

→ kdjf: 尤其是顆粒直接丟下去的用法)最好從0.1%一下開始。Na只要還 08/10 13:26

→ kdjf: 沒用完，平衡水量是固定的，但是分子篩平衡水量隨著已經吸水 08/10 13:26

→ kdjf: 的程度迅速上升 08/10 13:26

→ kdjf: 另外就是BHT的問題，前面有人提到column式乾燥可解決；但大 08/10 13:29

→ kdjf: 部分column過氧化物沒除得很乾淨，做特定反應的人會有影響 08/10 13:29

推 lieasy7105: 用Al2O3去除BHT 08/17 03:20

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lah chemical 在 Comments - YouTube 的必吃

[有機化學] Ch9.11 醇類還原概述feat. LAH /NaBH4 ... 威克漢化學Wickhan Chemistry •952 views ... How to Use Each Gas Law | Study Chemistry With Us. ... <看更多>

lah chemical 在 Chemical Engineering Society - DLSU - Facebook 的必吃

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#80. Reduction OF (LiAlH4 or LAH, NaBH4) and Examples

Step by step video solution for Reduction OF (LiAlH4 or LAH, NaBH4) and Examples by Chemistry experts to help you in doubts & scoring excellent ...

#81. Ch20: Reduction of Esters using LiAlH4 to 1o alcohols

Protonation of the alkoxide oxygen creates the primary alcohol product from the intermediate complex. previous page · next page. organic chemistry, © ...

#82. Ministry of Chemistry on Instagram

509 likes, 7 comments - Ministry of Chemistry (@ministryofchemistry) on Instagram: "Lithium aluminium hydride, commonly abbreviated to #LAH, ...

#83. MTHP | Kuraray Isoprene Chemicals Division

Kuraray ・ New solvent MTHP page / Isoprene Chemical Division. ... Grignard reaction / Coupling reaction; Reduction with metals (LAH, NaBH4, etc.) ...

#84. Protecting Agents

well as individual chemical properties, and appropriate selection ... deprotected under basic or reductive conditions (DIBAL, LAH,.

#85. About the Institute - Find Employees

Maša Lah. E-mail: masa.lah(at)ki.si; Department: D01 Theory department (Young Researchers),; L17 Laboratory for Molecular Modeling (Young Researchers).

#86. Lithium Aluminium Hydride (LAH) Market Report - Dataintelo

Lithium aluminum hydride is an inorganic compound with the chemical formula Lilah. The material exists as a white solid at room temperature and pressure, ...

#87. LAH 10mg Tablet 10's - Buy Medicines online at ... - Netmeds

LAH 10MG TABLET is an anti-allergic medicine. It reduces allergic reactions by blocking the release of certain chemicals (histamines) in the ...

#88. 19.3. Reductions using NaBH4, LiAlH4 | Organic Chemistry II

Reduction of aldehydes and ketones ... The most common sources of the hydride nucleophile are lithium aluminium hydride (LiAlH4) and sodium borohydride (NaBH4).

#89. Organic Syntheses Procedure

The borane–methyl sulfide complex is available from Aldrich Chemical Company, Inc. ... Procedure A using LAH is faster and more convenient than the BMS ...

#90. Glycoscience: Chemistry and Chemical Biology I–III

R a ) LAH in Et2O , 25 ° C or b ) NaBH4 , MeCN , rt Me or c ) NaBH4 , DMSO , 95 ° C 25 ROTS or OTf 26 for R = OTS , a ) 68 % c ) 70 % for R = OTf , b ) 57 ...

#91. Handbook for Chemical Process Research and Development, ...

Amides can be reduced to the corresponding amines with LAH, borane, or by catalytic hydrogenation, though high temperatures and pressures are usually ...

#92. hafiz ul lah - Indian Academy of Sciences

HAFIZ UL LAH. Articles written in Journal of Chemical Sciences. Volume 134 All articles Published: 2 February 2022 Article ID 0018.

#93. Disorientations: Spanish Colonialism in Africa and the ...

... Spain's earlier albeit suppressed involvement in chemical warfare in Morocco). ... It is Abdel-lah who prevents the nitrogen mustard from reaching its ...

#94. Metathesis Chemistry: From Nanostructure Design to Synthesis ...

... 18 19 20 21 22 LAH THF HO OH 1)MsCl, pyr 2) LAH,THF OEtEtO O O NaH,THF BrBr ... Synthesis of monomers 24 and 27 is based on diethyl malonate chemistry.

#95. Advances in Heterocyclic Chemistry - 第 71 頁 - Google 圖書結果

Reduction with LAH on this and pyrido[3,4-b]pyrazines leads to ... 215 M. Tisler and B. Stanovnich, “The Chemistry of Heterocyclic Compounds,” Vol. 27, p.

#96. Learn About Aldehyde Reaction With Lialh4 | Chegg.com

Chemical reducing agents are metal hydrides for aldehydes such as lithium ... One of the observable chemical properties of LAH is its vigorous reaction with ...

#97. Chemical Abstracts - 第 5 卷 - 第 1633 頁 - Google 圖書結果

V. NOW ation : Lah PER na m Jon , ( B e group PRE ENSEN ? B be ide ne is for isting ary proc ioxyac c . ferme Sugar post PHELA NA AK !

#98. A Report on Reagents and its Quenching Methods

LAH stands for Lithium Aluminium Hydride, which is an inorganic substance having the chemical formula LiAlH4. It's a solid grey colour.