問題一覧
1
Sorry, could you repeat your question?
2
補足へ
3
Actually, this surfactant was selected by our research partner, but I think it is a good choice because it makes stable foam and reacts easily to changes in pH and salt.
4
I tried PDADMAC(Poly diallyldimethylammonium chloride) as a cationic polymer, but it showed poor dispersion stability and the complexes precipitated. So, I selected gelatin instead, because it has relatively good hydrophilicity and excellent gelling ability.
5
In general, gelatin can be divided into acid-treated gelatin and alkali-treated gelatin, but We selected acid-treated gelatin because it has a higher isoelectric point and keeps the opposite charge to the anionic surfactants over a wider range of pH.This makes it easier to form a mixed adsorption layer.
6
補足スライドへ (As shown in this figure, at short times, there is not a significant difference between the surfactant-only system and the gelatin-added system. So, in the gelatin-added system, I assume that the improvement in short-term foam stability due to the formation of a solid-like interfacial film contributes to the improved foamability.)
7
In the gelatin-added system at 5 mM surfactant concentration, more than 80% of the foam remained even 3 days after foaming.
8
It’s hard to see in these photos, but the gelatin-added system appears turbid. I think this is because the complexes of surfactant and gelatin scatter light.
9
The dispersion stability was good up to one day, but after two days, the complexes precipitated
10
The foam stability in the gelatin-only system was higher than that in the surfactant-only system, but it was about 60% after one day.
11
This is because when the gelatin concentration is above 0.5 mass%, the solution gels and can no longer produce foam.
12
Foam stability decreases above 50 mM. This may be because surfactant molecules are quickly supplied from the bulk, so the restoring force doesn’t work well at the interface.
13
These pictures show only the foam attached to the glass wall. So, to investigate the internal foam morphology and bubble size, we consider that techniques such as Small-Angle Neutron Scattering (SANS) are required.
14
Based on the results of static surface tension measurement, below 5 mM, Individual molecules and complexes adsorb at the interface. And above 12 mM, complexes are replaced by the surfactants at the interface Whereas, at 5 mM, The interface is saturate with adsorbed complexes, it giving the highest interfacial elasticity. This likely prevent bubble coalescence and drainage, as a result, closely packed and stable foam was formed.
15
補足スライド
16
補足スライドへ
17
補足スライドへ
18
補足スライドへ
19
補足スライドへ
20
To investigate the interaction between surfactant and gelatin, we are planning to conduct FT-IR and ITC measurements.
21
In general, G′ and G″ are presented together, in this slide, G″ was omitted for clarity, because G′ was higher than G″ in almost the entire range described in this graph.
自己紹介・プライベート
自己紹介・プライベート
ユーザ名非公開 · 14問 · 11ヶ月前自己紹介・プライベート
自己紹介・プライベート
14問 • 11ヶ月前趣味・特技
趣味・特技
ユーザ名非公開 · 11問 · 11ヶ月前趣味・特技
趣味・特技
11問 • 11ヶ月前強み・弱み・性格
強み・弱み・性格
ユーザ名非公開 · 25問 · 11ヶ月前強み・弱み・性格
強み・弱み・性格
25問 • 11ヶ月前人生について
人生について
ユーザ名非公開 · 7問 · 11ヶ月前人生について
人生について
7問 • 11ヶ月前ダンスサークルのチームリーダー
ダンスサークルのチームリーダー
ユーザ名非公開 · 32問 · 11ヶ月前ダンスサークルのチームリーダー
ダンスサークルのチームリーダー
32問 • 11ヶ月前研究内容
研究内容
ユーザ名非公開 · 15問 · 11ヶ月前研究内容
研究内容
15問 • 11ヶ月前DSHC
DSHC
ユーザ名非公開 · 37問 · 11ヶ月前DSHC
DSHC
37問 • 11ヶ月前英語口頭発表 語句リスト
英語口頭発表 語句リスト
ユーザ名非公開 · 35問 · 5ヶ月前英語口頭発表 語句リスト
英語口頭発表 語句リスト
35問 • 5ヶ月前英語口頭発表 原稿
英語口頭発表 原稿
ユーザ名非公開 · 9問 · 5ヶ月前英語口頭発表 原稿
英語口頭発表 原稿
9問 • 5ヶ月前問題一覧
1
Sorry, could you repeat your question?
2
補足へ
3
Actually, this surfactant was selected by our research partner, but I think it is a good choice because it makes stable foam and reacts easily to changes in pH and salt.
4
I tried PDADMAC(Poly diallyldimethylammonium chloride) as a cationic polymer, but it showed poor dispersion stability and the complexes precipitated. So, I selected gelatin instead, because it has relatively good hydrophilicity and excellent gelling ability.
5
In general, gelatin can be divided into acid-treated gelatin and alkali-treated gelatin, but We selected acid-treated gelatin because it has a higher isoelectric point and keeps the opposite charge to the anionic surfactants over a wider range of pH.This makes it easier to form a mixed adsorption layer.
6
補足スライドへ (As shown in this figure, at short times, there is not a significant difference between the surfactant-only system and the gelatin-added system. So, in the gelatin-added system, I assume that the improvement in short-term foam stability due to the formation of a solid-like interfacial film contributes to the improved foamability.)
7
In the gelatin-added system at 5 mM surfactant concentration, more than 80% of the foam remained even 3 days after foaming.
8
It’s hard to see in these photos, but the gelatin-added system appears turbid. I think this is because the complexes of surfactant and gelatin scatter light.
9
The dispersion stability was good up to one day, but after two days, the complexes precipitated
10
The foam stability in the gelatin-only system was higher than that in the surfactant-only system, but it was about 60% after one day.
11
This is because when the gelatin concentration is above 0.5 mass%, the solution gels and can no longer produce foam.
12
Foam stability decreases above 50 mM. This may be because surfactant molecules are quickly supplied from the bulk, so the restoring force doesn’t work well at the interface.
13
These pictures show only the foam attached to the glass wall. So, to investigate the internal foam morphology and bubble size, we consider that techniques such as Small-Angle Neutron Scattering (SANS) are required.
14
Based on the results of static surface tension measurement, below 5 mM, Individual molecules and complexes adsorb at the interface. And above 12 mM, complexes are replaced by the surfactants at the interface Whereas, at 5 mM, The interface is saturate with adsorbed complexes, it giving the highest interfacial elasticity. This likely prevent bubble coalescence and drainage, as a result, closely packed and stable foam was formed.
15
補足スライド
16
補足スライドへ
17
補足スライドへ
18
補足スライドへ
19
補足スライドへ
20
To investigate the interaction between surfactant and gelatin, we are planning to conduct FT-IR and ITC measurements.
21
In general, G′ and G″ are presented together, in this slide, G″ was omitted for clarity, because G′ was higher than G″ in almost the entire range described in this graph.