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	<title>細孔分布測定装置 | 株式会社アイテス</title>
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		<title>BET法による粉末ゼオライトの比表面積測定</title>
		<link>https://www.ites.co.jp/chemistry/index/component_analysis/zeolite-powder.html</link>
		
		<dc:creator><![CDATA[fujiko3_staff]]></dc:creator>
		<pubDate>Wed, 11 Mar 2026 08:02:08 +0000</pubDate>
				<guid isPermaLink="false">https://www.ites.co.jp/?post_type=chemistry&#038;p=49209</guid>

					<description><![CDATA[<p>固体表面へのガス分子の物理吸着現象をモデル化、数式化した理論として、BET理論が知られています。この理論に基づき、粉末固体表面へのガス分子の物理吸着量を測定することにより、粉末の比表面積を算出することが可能となります。 ... </p>
<div class="textAR"><a href="https://www.ites.co.jp/chemistry/index/component_analysis/zeolite-powder.html" class="morelink">続きを読む→</a></div>
The post <a href="https://www.ites.co.jp/chemistry/index/component_analysis/zeolite-powder.html">BET法による粉末ゼオライトの比表面積測定</a> first appeared on <a href="https://www.ites.co.jp">株式会社アイテス</a>.]]></description>
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									<p>固体表面へのガス分子の物理吸着現象をモデル化、数式化した理論として、BET理論が知られています。この理論に基づき、粉末固体表面へのガス分子の物理吸着量を測定することにより、粉末の比表面積を算出することが可能となります。</p>								</div>
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					<h2 class="elementor-heading-title elementor-size-default">BET理論について</h2>				</div>
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															<img fetchpriority="high" decoding="async" width="800" height="873" src="https://www.ites.co.jp/wp-content/uploads/Picture3-23-938x1024.png" class="attachment-large size-large wp-image-49214" alt="" srcset="https://www.ites.co.jp/wp-content/uploads/Picture3-23-938x1024.png 938w, https://www.ites.co.jp/wp-content/uploads/Picture3-23-275x300.png 275w, https://www.ites.co.jp/wp-content/uploads/Picture3-23-768x839.png 768w, https://www.ites.co.jp/wp-content/uploads/Picture3-23.png 1252w" sizes="(max-width: 800px) 100vw, 800px" />															</div>
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									<p>固体表面にガス分子が物理吸着する現象のモデルを図1に示します。圧力の上昇に伴い、ガスの吸着量は多くなりますが、同時に2層目、3層目へと多分子層吸着が起こることを想定しています。</p><p> </p><div><div>このモデルにおいて、相対圧、吸着量の関係を数式で示したものが式1になります。</div><div>モデル、理論の提唱者であるBrunauer、Emmett、Tellerの頭文字からBET理論と命名されています。</div><div> </div></div><div> </div><div><div>相対圧P/P<sub>0</sub>とP/V(P<sub>0</sub> －P) をプロットし、CやV<sub>m</sub>の値を求めます。この際、定数C値が正の値となるよう、計算に使用するP/P<sub>0</sub>の範囲を決めます。得られたV<sub>m</sub>の値を用いて固体表面の比表面積S<sub>BET</sub>を式2によって、求めることができます。</div></div><div> </div>								</div>
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					<h2 class="elementor-heading-title elementor-size-default">合成ゼオライトのBETプロット及び比表面積の算出</h2>				</div>
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															<img decoding="async" width="800" height="763" src="https://www.ites.co.jp/wp-content/uploads/Picture4-10-1024x977.png" class="attachment-large size-large wp-image-49215" alt="" srcset="https://www.ites.co.jp/wp-content/uploads/Picture4-10-1024x977.png 1024w, https://www.ites.co.jp/wp-content/uploads/Picture4-10-300x286.png 300w, https://www.ites.co.jp/wp-content/uploads/Picture4-10-768x733.png 768w, https://www.ites.co.jp/wp-content/uploads/Picture4-10.png 1031w" sizes="(max-width: 800px) 100vw, 800px" />															</div>
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									<p>図2に合成ゼオライトのBETプロットを示します。相対圧0～0.05の範囲で、BET式から各パラメーターは、以下のように算出されました。</p><div>　　　　V<sub>m</sub> = 215.48 cm<sup>3</sup>/g</div><div><span style="font-size: 15px;">　　　　</span>C = 2.2138 E+04</div><div> </div><div><div>この結果を基に、合成ゼオライトの比表面積は、938 m<sup>2</sup>/g と算出されました。</div><div style="font-size: 15px;"> </div><div style="font-size: 15px;"><span style="font-size: 15px;">               使用装置</span></div><div style="font-size: 15px;">　　　　　マイクロトラック・ベル製</div><div style="font-size: 15px;">　　　　　BELSORP MAX 2</div><div style="font-size: 15px;">　　　　　吸着ガス: N<sub>2</sub></div><div> </div></div>								</div>
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					<h2 class="elementor-heading-title elementor-size-default">その他のアプリケーションについて</h2>				</div>
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									<p>今回紹介したゼオライト以外に、触媒や活性炭などの比表面積の測定にも使用できます。また、細孔分布を分析することも可能です。</p><div> </div><div><div>測定は協力会社での実施となります。</div></div>								</div>
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				</div>The post <a href="https://www.ites.co.jp/chemistry/index/component_analysis/zeolite-powder.html">BET法による粉末ゼオライトの比表面積測定</a> first appeared on <a href="https://www.ites.co.jp">株式会社アイテス</a>.]]></content:encoded>
					
		
		
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		<title>不織布シートの細孔分布評価</title>
		<link>https://www.ites.co.jp/chemistry/index/surface_analysis/pore-distribution-evaluation_nonwoven-fabric-sheets.html</link>
		
		<dc:creator><![CDATA[fujiko3_staff]]></dc:creator>
		<pubDate>Tue, 27 Feb 2024 01:00:33 +0000</pubDate>
				<guid isPermaLink="false">https://www.ites.co.jp/?post_type=chemistry&#038;p=41941</guid>

					<description><![CDATA[<p>不織布シートや膜材料の孔径、細孔分布の評価は、機能材料の性能評価、品質管理において重要な分析項目です。不織布シートの最大孔径、細孔分布を、バブルポイント法を用いて評価した例を紹介します。 バブルポイント法について バブル... </p>
<div class="textAR"><a href="https://www.ites.co.jp/chemistry/index/surface_analysis/pore-distribution-evaluation_nonwoven-fabric-sheets.html" class="morelink">続きを読む→</a></div>
The post <a href="https://www.ites.co.jp/chemistry/index/surface_analysis/pore-distribution-evaluation_nonwoven-fabric-sheets.html">不織布シートの細孔分布評価</a> first appeared on <a href="https://www.ites.co.jp">株式会社アイテス</a>.]]></description>
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									<p>不織布シートや膜材料の孔径、細孔分布の評価は、機能材料の性能評価、品質管理において重要な分析項目です。不織布シートの最大孔径、細孔分布を、バブルポイント法を用いて評価した例を紹介します。</p>								</div>
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					<h2 class="elementor-heading-title elementor-size-default">バブルポイント法について</h2>				</div>
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									<p>バブルポイント法は、紙、不織布などシート状材料の孔径評価に適した分析手法です。概要を図1に示します。</p><p>試料を薬液に浸漬し空気圧を加えます。圧力を加え、シートに染み込んだ薬液の表面張力に打ち勝ち、気泡の出現が生じたときの圧力をバブルポイントといいます。</p><p>最大孔径dは、バブルポイントの圧力、薬液の表面張力を基に計算することが可能です。</p><p> </p>								</div>
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									<p>d = C γ / P</p><p>　　d: 最大孔径</p><p>　　C: 定数　　γ: 薬液の表面張力 　P: 差圧</p>								</div>
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															<img decoding="async" width="768" height="636" src="https://www.ites.co.jp/wp-content/uploads/画像1-19-768x636.png" class="attachment-medium_large size-medium_large wp-image-41943" alt="バブルポイント法の概要" srcset="https://www.ites.co.jp/wp-content/uploads/画像1-19-768x636.png 768w, https://www.ites.co.jp/wp-content/uploads/画像1-19-300x248.png 300w, https://www.ites.co.jp/wp-content/uploads/画像1-19-1024x848.png 1024w, https://www.ites.co.jp/wp-content/uploads/画像1-19.png 1036w" sizes="(max-width: 768px) 100vw, 768px" />															</div>
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									<p>圧力変化に応じて、ガスの流量も変化します。流量計でガス量の変化を確認することで、細孔の分布の計測も可能となります。</p><p>通常は、水を用いて測定を行いますが、孔径が小さい場合や試料に液が染み込みにくい場合は、フルオロエーテル系の薬液を用います。</p>								</div>
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					<h2 class="elementor-heading-title elementor-size-default">液漏れ防止用不織布シートの孔径評価</h2>				</div>
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									<p>液漏れ防止用の不織布シートをフルオロエーテル系の薬液に浸し、空気圧を掛けたときの流量変化を図2に示します。</p><p>バブルポイント圧は 33.80KPaで、算出された最大孔径は1.35μmとなりました。細孔の分布を評価したところ、孔径サイズは、1.0～1.3μm程度でほぼ均一となっておりました（図3）。</p>								</div>
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															<img loading="lazy" decoding="async" width="768" height="588" src="https://www.ites.co.jp/wp-content/uploads/画像2-17-768x588.png" class="attachment-medium_large size-medium_large wp-image-41944" alt="" srcset="https://www.ites.co.jp/wp-content/uploads/画像2-17-768x588.png 768w, https://www.ites.co.jp/wp-content/uploads/画像2-17-300x230.png 300w, https://www.ites.co.jp/wp-content/uploads/画像2-17-1024x783.png 1024w, https://www.ites.co.jp/wp-content/uploads/画像2-17.png 1162w" sizes="(max-width: 768px) 100vw, 768px" />															</div>
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															<img loading="lazy" decoding="async" width="768" height="587" src="https://www.ites.co.jp/wp-content/uploads/画像3-13-768x587.png" class="attachment-medium_large size-medium_large wp-image-41945" alt="細孔分布" srcset="https://www.ites.co.jp/wp-content/uploads/画像3-13-768x587.png 768w, https://www.ites.co.jp/wp-content/uploads/画像3-13-300x229.png 300w, https://www.ites.co.jp/wp-content/uploads/画像3-13-1024x783.png 1024w, https://www.ites.co.jp/wp-content/uploads/画像3-13.png 1147w" sizes="(max-width: 768px) 100vw, 768px" />															</div>
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					<h2 class="elementor-heading-title elementor-size-default">適用範囲</h2>				</div>
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									<p>今回は、液漏れ防止用不織布シートの分析事例を紹介しましたが、バッテリーセパレーターの孔径分布評価やピンホール検出にも適用可能な分析手法です。</p>								</div>
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						<div class="elementor-element elementor-element-479c29c elementor-widget elementor-widget-text-editor" data-id="479c29c" data-element_type="widget" data-e-type="widget" data-widget_type="text-editor.default">
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									<p style="language: ja; line-height: 110%; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0in; text-align: justify; text-justify: inter-ideograph; direction: ltr; unicode-bidi: embed; mso-line-break-override: none; word-break: normal; punctuation-wrap: hanging;"><span style="font-size: 11pt; font-family: メイリオ;">測定孔径（浸漬液によって異なります）</span></p><p style="language: ja; line-height: 110%; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0in; text-align: justify; text-justify: inter-ideograph; direction: ltr; unicode-bidi: embed; mso-line-break-override: none; word-break: normal; punctuation-wrap: hanging;"><span style="font-size: 11pt; font-family: メイリオ;">　　水　　　約</span><span style="font-size: 11pt; font-family: メイリオ;">0.2</span><span style="font-size: 11pt; font-family: メイリオ;">～</span><span style="font-size: 11pt; font-family: メイリオ;">200μm</span></p><p><span style="font-size: 11pt; font-family: メイリオ;">　　フルオロエーテル　約</span><span style="font-size: 11pt; font-family: メイリオ;">50nm</span><span style="font-size: 11pt; font-family: メイリオ;">～</span><span style="font-size: 11pt; font-family: メイリオ;">40μm</span></p>								</div>
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				</div>The post <a href="https://www.ites.co.jp/chemistry/index/surface_analysis/pore-distribution-evaluation_nonwoven-fabric-sheets.html">不織布シートの細孔分布評価</a> first appeared on <a href="https://www.ites.co.jp">株式会社アイテス</a>.]]></content:encoded>
					
		
		
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